CN105656815A - Method and device for correcting radio-frequency channel - Google Patents

Abstract

The embodiment of the present invention discloses a radio frequency channel correction method, including: BBU obtains the channel estimation value of the first radio frequency channel according to the digital correction signal fed back by the antenna unit, and determines the channel estimation value of the first radio frequency channel according to the channel estimation value Initial correction compensation coefficient; the BBU corrects the initial correction compensation coefficient of the first radio frequency channel according to the delay value and sampling time of the first radio frequency channel to obtain a first correction compensation coefficient; the BBU calculates the first correction compensation coefficient according to the reference radio frequency The channel correction compensation coefficient performs alignment correction on the first correction compensation coefficient to obtain a second correction compensation coefficient, and calibrates the transmit signal mapped to the antenna unit according to the second correction compensation coefficient. The embodiment of the invention also discloses a radio frequency channel calibration device. The invention has the advantages of being able to correct each radio frequency channel and ensuring the reciprocity of the uplink and downlink channels.

Description

Calibration method and device for a radio frequency channel

technical field

The present invention relates to the technical field of communications, in particular to a radio frequency channel calibration method and device.

Background technique

In the frequency division duplex (FDD) long term evolution wireless access system (Long Term Evolution, LTE) system, when the angle expansion of the base station side is small, the reciprocity of the uplink and downlink channels is used to improve the weight accuracy and obtain array gain or multiple User multiplexing gain. In the FDD scenario, the reciprocity of the uplink and downlink radio frequency channels must be guaranteed, that is, the response of each radio frequency channel during signal reception is consistent, and the response of each radio frequency channel during signal transmission is consistent. When the response of each radio frequency channel in signal reception is inconsistent or the response of each radio frequency channel in signal transmission is inconsistent, it is necessary to correct the receiving channel (that is, each radio frequency channel in signal reception) or the transmission channel (that is, each radio frequency channel in signal transmission) .

In the prior art, there is no correction scheme for RF channels in the FDD scenario. In the FDD scenario, if the response of each RF channel in signal reception is inconsistent, or the response of each RF channel in signal transmission is inconsistent, the reciprocity of the uplink and downlink channels cannot be guaranteed. sex.

Contents of the invention

Embodiments of the present invention provide a radio frequency channel correction method and device, which can determine the correction compensation coefficient for radio frequency channel correction according to the channel estimation value, delay value, and sampling time of the radio frequency channel, and can map the radio frequency channel to the transmission signal of the antenna unit Perform calibration to ensure the reciprocity of the uplink and downlink channels.

The first aspect of the embodiment of the present invention provides a method for calibrating a radio frequency channel, which may include:

The baseband unit BBU obtains the channel estimation value of the first radio frequency channel according to the digital correction signal fed back by the antenna unit, and determines the initial correction compensation coefficient of the first radio frequency channel according to the channel estimation value;

The BBU corrects the initial correction compensation coefficient of the first radio frequency channel according to the delay value and sampling time of the first radio frequency channel to obtain a first correction compensation coefficient;

The BBU performs alignment correction on the first correction compensation coefficient according to the correction compensation coefficient of the reference radio frequency channel to obtain a second correction compensation coefficient, and calibrates the transmitted signal mapped to the antenna unit according to the second correction compensation coefficient .

With reference to the first aspect, in a first possible implementation manner, the first radio frequency channel is a transmission channel;

The BBU obtains the channel estimation value of the first radio frequency channel according to the digital correction signal fed back by the antenna unit, and determines the initial correction compensation coefficient of the first radio frequency channel according to the channel estimation value, including:

The BBU receives the digital correction signal fed back by the antenna unit from the designated receiving channel, performs digital signal processing on the digital correction signal fed back by the antenna unit, and obtains the channel estimation value of the transmitting channel;

Taking the reciprocal of the estimated channel value of the transmitting channel to obtain the initial correction compensation coefficient of the transmitting channel.

With reference to the first aspect, in a second possible implementation manner, the first radio frequency channel is a receiving channel;

The BBU obtains the channel estimation value of the first radio frequency channel according to the digital correction signal fed back by the antenna unit, and determines the initial correction compensation coefficient of the first radio frequency channel according to the channel estimation value, including:

The BBU receives a digital correction signal fed back by the antenna unit through the receiving channel, performs digital signal processing on the digital correction signal, and obtains a channel estimation value of the receiving channel;

Taking the reciprocal of the estimated channel value of the receiving channel to obtain the initial correction compensation coefficient of the receiving channel.

With reference to the first possible implementation of the first aspect or the second possible implementation of the first aspect, in a third possible implementation, the BBU according to the delay value and sampling time of the first radio frequency channel Correcting the initial correction compensation coefficient of the first radio frequency channel to obtain a first correction compensation coefficient, including:

The BBU multiplies the initial correction compensation coefficient of the first radio frequency channel by a specified index to correct the initial correction compensation coefficient of the first radio frequency channel to obtain a first correction compensation coefficient;

Among them, the specified index is The k is the identifier of the subcarrier, the τ _e is the delay value of the first radio frequency channel, the Ts is the sampling time, and the N is the number of fast Fourier transform FFT points.

In combination with the third possible implementation of the first aspect, in a fourth possible implementation, the BBU performs alignment correction on the first correction compensation coefficient according to the correction compensation coefficient of the reference radio frequency channel to obtain a second correction compensation Coefficients, including:

The BBU divides the first correction compensation coefficient of the first radio frequency channel by the correction compensation coefficient of the reference radio frequency channel to obtain a second correction compensation coefficient of the first radio frequency channel;

Wherein, the reference radio frequency channel is a transmit channel randomly selected from at least one transmit channel that transmits signals to the antenna unit, or a receive channel randomly selected from at least one receive channel that receives the correction signal fed back by the antenna unit. aisle.

With reference to any one of the fourth possible implementation manners from the first aspect to the first aspect, in a fifth possible implementation manner, the first radio frequency channel is each transmission channel of the transmission signal to the antenna unit Any one of them, or any one of the receiving channels that receive the correction signal fed back by the antenna unit.

With reference to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner, the calibrating the transmit signal mapped to the antenna unit according to the second correction compensation coefficient includes:

Determining the second correction compensation coefficients of each radio frequency channel, and calibrating the transmit signals of the respective radio frequency channels according to the second correction compensation coefficients of each radio frequency channel, to obtain the target transmit signal mapped to the antenna unit.

With reference to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner, the transmit signals of the radio frequency channels are calibrated according to the second correction compensation coefficients of the radio frequency channels to obtain the mapping transmitting signals to a purpose on said antenna unit, comprising:

forming a diagonal matrix according to the second correction compensation coefficients of each of the radio frequency channels, and forming a column matrix according to the frequency domain signals transmitted by each of the radio frequency channels on the subcarrier k and symbol l;

multiplying the diagonal matrix to the left by the column matrix to obtain the target transmission signal mapped to the antenna unit;

Wherein, the elements on the main diagonal of the diagonal matrix are the second correction compensation coefficients of each of the radio frequency channels.

With reference to any one of the seventh possible implementation manners from the first aspect to the first aspect, in an eighth possible implementation manner, when the radio frequency channel is a transmission channel in the time domain, the After the estimated value determines the initial correction compensation coefficient of the first radio frequency channel, the method further includes:

Acquiring the delay value of each radio frequency channel according to the time domain channel response of the main path of each radio frequency channel;

Acquiring a delay difference between each of the radio frequency channels and the reference radio frequency channel according to the delay value of the reference radio frequency channel;

Correcting the initial correction compensation coefficient of the first radio frequency channel according to the time delay difference between the first radio frequency channel and the reference radio frequency channel and the sampling time of the first radio frequency channel to obtain the first radio frequency channel The first correction compensation coefficient of ;

Wherein, the main path is the path with the strongest transmission signal among multiple paths from the radio frequency channel to the antenna unit, and the reference radio frequency channel is any radio frequency channel randomly selected in the radio frequency channels, with the The RF channel serves as the reference channel.

With reference to the eighth possible implementation manner of the first aspect, in a ninth possible implementation manner, the method further includes: compensating the initial phase of each of the radio frequency channels, so as to combine the delay value in the time domain and The phase is transformed to the frequency domain for calibration.

With reference to the ninth possible implementation manner of the first aspect, in the tenth possible implementation manner, the compensating the initial phase of each radio frequency channel includes:

extracting the phase of each of the radio frequency channels from the time domain channel response of each of the radio frequency channels;

Acquiring a phase difference between each of the radio frequency channels and the reference radio frequency channel according to the phase of the reference radio frequency channel;

According to the phase difference between each of the radio frequency channels and the reference radio frequency channel, and the delay value and sampling time of each of the radio frequency channels, the initial correction compensation coefficient of each of the radio frequency channels is corrected to obtain each of the radio frequency channels The first correction compensation coefficient of .

The second aspect of the embodiment of the present invention provides a radio frequency channel correction device, which may include:

A determination module, configured to obtain a channel estimation value of the first radio frequency channel according to the digital correction signal fed back by the antenna unit, and determine an initial correction compensation coefficient of the first radio frequency channel according to the channel estimation value;

A correction module, configured to correct the initial correction compensation coefficient of the first radio frequency channel determined by the determination module according to the delay value and sampling time of the first radio frequency channel, to obtain a first correction compensation coefficient;

A calibration module, configured to perform alignment correction on the first correction compensation coefficient corrected by the correction module according to the correction compensation coefficient of the reference radio frequency channel, to obtain a second correction compensation coefficient;

The calibration module is further configured to calibrate the transmitted signal mapped to the antenna unit according to the second correction compensation coefficient.

With reference to the second aspect, in a first possible implementation manner, the first radio frequency channel is a transmission channel;

The determination module is specifically used for:

receiving a digital correction signal fed back by the antenna unit from a designated receiving channel, performing digital signal processing on the digital correction signal fed back by the antenna unit, and obtaining a channel estimation value of the transmitting channel;

Taking the reciprocal of the estimated channel value of the transmitting channel to obtain the initial correction compensation coefficient of the transmitting channel.

With reference to the second aspect, in a second possible implementation manner, the first radio frequency channel is a receiving channel;

The determination module is specifically used for:

receiving a digital correction signal fed back by the antenna unit through the receiving channel, performing digital signal processing on the digital correction signal, and obtaining a channel estimation value of the receiving channel;

Taking the reciprocal of the estimated channel value of the receiving channel to obtain the initial correction compensation coefficient of the receiving channel.

In combination with the first possible implementation of the second aspect or the second possible implementation of the second aspect, in a third possible implementation, the correction module is specifically configured to:

Multiplying the initial correction compensation coefficient of the first radio frequency channel by a specified index to correct the initial correction compensation coefficient of the first radio frequency channel to obtain a first correction compensation coefficient;

Among them, the specified index is The k is the identifier of the subcarrier, the τ _e is the delay value of the first radio frequency channel, the Ts is the sampling time, and the N is the number of fast Fourier transform FFT points.

With reference to the third possible implementation of the second aspect, in a fourth possible implementation, the calibration module is specifically used for:

dividing the first correction compensation coefficient of the first radio frequency channel by the correction compensation coefficient of the reference radio frequency channel to obtain a second correction compensation coefficient of the first radio frequency channel;

Wherein, the reference radio frequency channel is a transmit channel randomly selected from at least one transmit channel that transmits signals to the antenna unit, or a receive channel randomly selected from at least one receive channel that receives the correction signal fed back by the antenna unit. aisle.

With reference to any one of the fourth possible implementation manners from the second aspect to the second aspect, in a fifth possible implementation manner, the first radio frequency channel is each transmission channel of the transmitted signal to the antenna unit Any one of them, or any one of the receiving channels that receive the correction signal fed back by the antenna unit.

With reference to the fifth possible implementation of the second aspect, in a sixth possible implementation, the calibration module is specifically configured to:

Determining the second correction compensation coefficients of each radio frequency channel, and calibrating the transmit signals of the respective radio frequency channels according to the second correction compensation coefficients of each radio frequency channel, to obtain the target transmit signal mapped to the antenna unit.

With reference to the sixth possible implementation manner of the second aspect, in a seventh possible implementation manner, the calibration module is specifically configured to:

forming a diagonal matrix according to the second correction compensation coefficients of each of the radio frequency channels, and forming a column matrix according to the frequency domain signals transmitted by each of the radio frequency channels on the subcarrier k and symbol l;

multiplying the diagonal matrix to the left by the column matrix to obtain the target transmission signal mapped to the antenna unit;

Wherein, the elements on the main diagonal of the diagonal matrix are the second correction compensation coefficients of each of the radio frequency channels.

With reference to any one of the second aspect to the seventh possible implementation manner of the second aspect, in an eighth possible implementation manner, when the radio frequency channel is a transmission channel in the time domain, the device further includes:

An acquisition module, configured to acquire the delay value of each radio frequency channel according to the time domain channel response of the main path of each radio frequency channel;

The acquiring module is further configured to acquire a delay difference between each of the radio frequency channels and the reference radio frequency channel according to the delay value of the reference radio frequency channel;

The correction module is further configured to correct the initial correction compensation coefficient of the first radio frequency channel according to the delay difference between the first radio frequency channel and the reference radio frequency channel, and the sampling time of the first radio frequency channel , to obtain the first correction compensation coefficient of the first radio frequency channel;

Wherein, the main path is the path with the strongest transmission signal among multiple paths from the radio frequency channel to the antenna unit, and the reference radio frequency channel is any radio frequency channel randomly selected in the radio frequency channels, with the The RF channel serves as the reference channel.

With reference to the eighth possible implementation manner of the second aspect, in a ninth possible implementation manner, the device further includes:

The compensation module is configured to compensate the initial phase of each radio frequency channel, so as to transform the delay value and phase in the time domain to the frequency domain for calibration.

With reference to the ninth possible implementation manner of the second aspect, in the tenth possible implementation manner, the compensation module is specifically configured to:

extracting the phase of each of the radio frequency channels from the time domain channel response of each of the radio frequency channels, and obtaining the phase difference between each of the radio frequency channels and the reference radio frequency channel according to the phase of the reference radio frequency channel;

The correction module is further configured to perform an initial calibration compensation coefficient for each of the radio frequency channels according to the phase difference between each of the radio frequency channels and the reference radio frequency channel, and the delay value and sampling time of each of the radio frequency channels correction to obtain the first correction compensation coefficients for each of the radio frequency channels.

In the embodiment of the present invention, the channel estimation value of the radio frequency channel can be obtained according to the digital correction signal fed back by the antenna unit, the initial correction compensation coefficient of the radio frequency channel can be determined according to the channel estimation value of the radio frequency channel, and the radio frequency can be adjusted according to the delay value and sampling time of the radio frequency channel. Correct the initial correction compensation coefficient of the channel, and then calibrate the transmitted signal mapped to the antenna unit according to the corrected correction compensation coefficient, realize the correction of the radio frequency channel under the frequency division duplex system, and ensure the reciprocity of the uplink and downlink channels .

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a schematic diagram of a base station architecture provided by an embodiment of the present invention;

FIG. 2 is another schematic diagram of a base station architecture provided by an embodiment of the present invention;

FIG. 3 is another schematic diagram of a base station architecture provided by an embodiment of the present invention;

FIG. 4 is another schematic diagram of a base station architecture provided by an embodiment of the present invention;

Fig. 5 is a schematic flow chart of the first embodiment of the radio frequency channel correction method provided by the embodiment of the present invention;

FIG. 6 is another schematic diagram of a base station architecture provided by an embodiment of the present invention;

FIG. 7 is a schematic flowchart of a second embodiment of a method for correcting a radio frequency channel provided by an embodiment of the present invention;

Fig. 8 is a schematic structural diagram of a first embodiment of a radio frequency channel correction device provided by an embodiment of the present invention;

Fig. 9 is a schematic structural diagram of a second embodiment of a radio frequency channel correction device provided by an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In the specific implementation, the correction method of the radio frequency channel described in the embodiment of the present invention is mainly to correct the radio frequency channel in the FDDLTE system, wherein the above radio frequency channel includes: each radio frequency channel (also called the receiving channel) in signal reception, Or various radio frequency channels (also called transmission channels) in signal transmission. The calibration method of the radio frequency channel described in the embodiment of the present invention is applicable to various base station architectures, and the above base station architecture includes: a baseband unit (BasebandUnit, BBU), a remote radio frequency unit (RemoteRadioUnit, RRU), and an antenna unit. Wherein, the above-mentioned RRU may include a 2-port RRU and a 4-port RRU, wherein the above-mentioned antenna unit may also include a 2-port antenna unit and a 4-port antenna unit, etc., which are not limited here. FIG. 1 is a schematic diagram of a base station architecture provided by an embodiment of the present invention. The base station architecture shown in FIG. 1 may consist of a BBU, a 4-port RRU, and a 4-port antenna unit. FIG. 2 is another schematic diagram of a base station architecture provided by an embodiment of the present invention. The base station architecture shown in FIG. 2 may consist of a BBU, two 2-port RRUs, and one 4-port antenna unit. FIG. 3 is another schematic diagram of a base station architecture provided by an embodiment of the present invention. The base station architecture shown in FIG. 3 may consist of a BBU, one 4-port RRU, and two 2-port antenna units. FIG. 4 is another schematic diagram of a base station architecture provided by an embodiment of the present invention. The base station architecture shown in FIG. 4 may consist of a BBU, two 2-port RRUs, and two 2-port antenna units. In specific implementation, in the above base station architectures, the BBU and the RRU may be two independent functional modules, or the BBU may be integrated into the RRU, or part of the functions of the BBU may be integrated into the RRU, which is not limited here.

The method for calibrating radio frequency channels described in the embodiments of the present invention may be applicable to the base station architectures described above in FIG. 1 to FIG. 4 , and may also be applicable to other base station architectures, which are not limited here.

Referring to FIG. 5 , it is a schematic flow chart of the first embodiment of the radio frequency channel calibration method provided by the embodiment of the present invention. The calibration method of the radio frequency channel described in the embodiment of the present invention includes steps:

S101. The baseband unit BBU acquires a channel estimation value of a first radio frequency channel according to a digital correction signal fed back by an antenna unit, and determines an initial correction compensation coefficient of the first radio frequency channel according to the channel estimation value.

In some feasible implementation manners, the BBU can establish a connection with the RRU through a common public radio interface (CommonPublicRadioInterface, CPRI), and the BBU can transmit digital signals to the RRU through the CPRI interface, so as to send signals to the antenna units through the RRU. As shown in Figure 6, the BBU can send digital signals to the RRU through the CPRI interfaces A0 and C0. After the RRU receives the digital signal sent by the BBU, it can convert the above digital signal into a radio frequency correction signal, and transmit it through the radio frequency cable (as shown in Figure 6. A1->A2, B1->B2, C1->C2 and D1->D2, etc.) send the radio frequency correction signal to the antenna unit. After the radio frequency correction signal sent by the RRU to the antenna unit is coupled and communicated by the antenna unit, the radio frequency correction signal is looped back from the dedicated channel inside the RRU or the feedback channel used to measure the quality of the transmission channel. The RRU can convert the loopback radio frequency correction signal into a digital correction signal and return it to the BBU, and the BBU can obtain the first radio frequency channel according to the digital correction signal fed back by the antenna unit (that is, the radio frequency correction signal fed back by the antenna unit is converted into a digital correction signal by the RRU) channel estimate.

In a specific implementation, the radio frequency channel described in the embodiment of the present invention may include a transmit channel and a receive channel, and the BBU may first initiate joint calibration of the transmit channel, and then initiate joint calibration of the receive channel. The radio frequency channel calibration method provided by the embodiment of the present invention will be described in detail below mainly by taking the radio frequency channel calibration method when the BBU initiates the joint calibration of the transmit channels as an example.

In a specific implementation, the first radio frequency channel described in the embodiment of the present invention is any one of multiple transmission channels, that is, the first radio frequency channel will be used as an example below, and the calibration steps of each transmission channel will be described in detail.

In some feasible implementation manners, the BBU can select the receiving channel corresponding to any one of the transmitting channels (set as the first radio frequency channel) from the multiple transmitting channels to receive the digital correction signal, and determine the channel of the transmitting channel according to the above digital correction signal estimated value. In the specific implementation, when the BBU calibrates each of the multiple transmit channels, it can receive the digital correction signal from the same receive channel (that is, the designated receive channel), that is, when the digital correction signal loops back, it can receive the digital correction signal from the same receive channel In loopback, the BBU can determine the channel estimation value of the transmit channel according to the digital correction signal received from the receive channel. Specifically, when the BBU transmits a signal to the antenna unit, it can transmit it from multiple transmission channels. When the signal is received, the BBU can receive the signal fed back by the antenna unit through the RRU from the reception channel corresponding to the above multiple transmission channels, and then can select the specified receiving channel. channel (the digital signal received by the same receiving channel is selected for calibration for all the transmitting channels) and digital signal processing is performed on the received signal to obtain the channel estimation value of the first radio frequency channel.

In a specific implementation, after the BBU obtains the channel estimation value of the first radio frequency channel, it may determine the initial correction compensation coefficient of the first radio frequency channel according to the channel estimation value. Specifically, the BBU can obtain the digital correction signal received by the receiving channel corresponding to the transmitting channel i, and determine the channel estimation value h _tx,i (k, l) of the digital correction signal on the channel with subcarrier k and symbol l. As shown in FIG. 6 , the BBU can determine the estimated channel value of the transmission channel 0 as h _tx,0 (k,l) according to the digital correction signal fed back by the transmission channel 0 of the RRU0. The BBU can also determine the estimated channel value of the transmit channel 1 h _{tx, 1} (k, l)) according to the digital correction signal fed back by the receive channel corresponding to the transmit channel 1 of the RRU1 (i.e., the designated receive channel), and then according to the above The channel estimation value of transmission channel 0 or transmission channel 1 determines the initial calibration compensation coefficient of transmission channel 0 or the initial calibration compensation coefficient of transmission channel 1 . Specifically, the BBU may take the reciprocal of the channel estimation value of the above transmission channel 0 to obtain the initial correction compensation coefficient β _tx,0 (k,l))=1/(h _tx,0 (k,l)) of the transmission channel 0, Take the reciprocal of the above-mentioned channel estimation value of transmit channel 1 to obtain the initial correction compensation coefficient β _tx,1 (k,l))=1/(h _tx,1 (k,1)) of transmit channel 1.

In the embodiment of the present invention, since the correction signal of the transmission channel may not be available on all subcarriers within the system bandwidth, it may be considered to use adjacent point interpolation to obtain the frequency domain channel response of all subcarriers in the full frequency band (i.e. Channel estimation value), other methods may also be used to obtain frequency-domain channel responses of all subcarriers, which are not limited here.

S102. The BBU corrects the initial correction compensation coefficient of the first radio frequency channel according to the delay value and sampling time of the first radio frequency channel to obtain a first correction compensation coefficient.

In the embodiment of the present invention, as shown in Figure 6, it is assumed that a transmission channel (such as Tx0) in RRU0 is used as a reference radio frequency channel, if the correction signal received by RRU0 is looped back from the A1 interface, since the correction signal transmitted by Tx0 is directly transmitted in RRU0 Internal reflection does not pass through the cable from A1 to A2, while the correction signals of other points such as B2 to A1, C2 to A1 or D2 to A1 pass through the RF cable, and the transmission and reception must pass through the RF cable, so There will be 2x the cable delay. That is, in the above scenario, the correction loopback signal of Tx0 has 2 times less cable delay than the correction signals of other transmission channels, so it is necessary to correct the initial correction compensation coefficients of each transmission channel to obtain the corrected correction compensation coefficients .

In some feasible implementation manners, when the BBU corrects the initial correction compensation coefficient of the first radio frequency channel, it can correct the initial correction compensation coefficient of the first radio frequency channel according to the delay value and sampling time of the first radio frequency channel, and obtain The first correction compensation coefficient of the first radio frequency channel, that is, the correction compensation coefficient after the initial correction compensation coefficient of the first radio frequency channel is corrected. In the embodiment of the present invention, the delay value τ _e of the radio frequency channels (including the first radio frequency channel and other radio frequency channels) is obtained through configuration of network management tools such as Operation Manager (OM), or when the base station architecture is installed Direct on-site input. Specifically, the BBU may perform a multiplication operation on the initial calibration compensation coefficient of the first radio frequency channel and a specified index, and correct the initial calibration compensation coefficient of the first radio frequency channel through the multiplication operation to obtain the first calibration compensation coefficient. Among them, the above specified index is Wherein, k is the identifier of the subcarrier, τ _e is the time delay value of the first radio frequency channel, Ts is the sampling time, and N is the number of Fast Fourier Transformation (FastFourierTransformation, FFT) points. In the LTE system, corresponding to a 20M bandwidth system, the sampling frequency may be 30.72M, and the above sampling time Ts is the reciprocal of the sampling frequency. For example, taking emission channel 0 as an example, when correcting the initial correction compensation coefficient of emission channel 0, the initial correction compensation coefficient of emission channel 0 can be multiplied by the above-mentioned specified function to obtain the first correction compensation coefficient of emission channel 0 . For example, β _{tx, 0} (k, l) 1 = β _{tx, 0} (k, l) Among them, the above-mentioned β _tx,0 (k,l) is the initial correction compensation coefficient of the transmission channel 0, and β _tx,0 (k,l)1 is the correction compensation coefficient after the correction of the initial correction compensation coefficient of the transmission channel 0 (that is, the transmission The first correction compensation coefficient of channel 0), _τe is the time delay value of the transmission channel 0, that is, the propagation delay from A1 to A2, and Ts is the sampling time of the transmission channel 0.

In a specific implementation, the BBU may correct the initial correction compensation coefficients of each transmission channel according to the above correction method to obtain the first correction compensation coefficients of each transmission channel, which will not be described in detail here.

S103, the BBU performs alignment correction on the first correction compensation coefficient according to the correction compensation coefficient of the reference radio frequency channel to obtain a second correction compensation coefficient, and according to the second correction compensation coefficient, the transmit signal mapped to the antenna unit is corrected to calibrate.

In some feasible implementation manners, in order to avoid the delay or advance of all compensated channels together after correction and compensation, the first correction compensation coefficients of each emission channel can be aligned and corrected to obtain the second correction compensation coefficients, Then, the transmit signals mapped to the antenna units by each transmit channel are calibrated according to the second correction compensation coefficient, so as to eliminate the influence of time delay on the transmit signals mapped to the antenna units. Specifically, the BBU can randomly select a radio frequency channel from each radio frequency channel (specifically, it can be a transmission channel) as a reference radio frequency channel, such as the transmission channel 0 (Tx0), and use the above reference radio frequency channel as a reference object for alignment correction. Alignment correction is performed on the first correction compensation coefficient of the radio frequency channel. When the BBU performs alignment correction on the first correction compensation coefficient β _tx,i (k,l)1 of the first radio frequency channel (for example, transmission channel i), the first correction compensation coefficient β _tx,i (k , l) 1 is divided by the correction compensation coefficient of the reference radio frequency channel (i.e. the first correction compensation coefficient β _{tx of the reference radio frequency channel, 0} (k, l) 1), to obtain the second correction compensation coefficient β _{tx of the first radio frequency channel, i} (k, l) 2, such as β _{tx, i} (k, l) 2 = β _{tx, i} (k, l) 1/β _{tx, 0} (k, l) 1.

In the embodiment of the present invention, if the BBU calibrates the transmit channel, a transmit channel can be randomly selected from each transmit channel as the reference radio frequency channel; A receiving channel is randomly selected as the reference RF channel. That is, the reference video channel described in the embodiment of the present invention may be any one of multiple transmit channels that transmit signals to the antenna unit, or any one of multiple receive channels that receive the correction signal fed back by the antenna unit, specifically Choose according to the actual scene, and there is no limitation here.

In a specific implementation, the BBU can perform alignment correction on the first correction compensation coefficient (β _{tx, i} (k, l)1) of each radio frequency channel according to the above alignment correction method, and obtain the second correction compensation coefficient (β _{tx , i} (k, l)2), which will not be described in detail here.

In some feasible implementation manners, after the BBU determines the second correction compensation coefficient of each radio frequency channel that transmits the signal to the antenna unit, it can calibrate the transmit signal of each radio frequency channel according to the second correction compensation coefficient of each radio frequency channel, and obtain The destination transmit signal mapped to the antenna element. Specifically, the BBU may form a diagonal matrix according to the second correction compensation coefficients of each radio frequency channel, where the elements on the main diagonal of the above diagonal matrix are the second correction compensation coefficients of each radio frequency channel. The BBU can also form a column matrix according to the frequency domain signals transmitted by each radio frequency channel on subcarrier k and symbol l, and then multiply the above diagonal matrix to the left by the above column matrix to obtain the target transmission signal mapped to the antenna unit. Specifically, when the downlink signal is transmitted, a diagonal matrix can be established, and the second correction compensation coefficients of each transmission channel are placed on the main diagonal of the diagonal matrix, and each transmission channel is placed on the subcarrier k and symbol l The transmitted frequency domain signals form a column matrix, and the above diagonal matrix is multiplied by the above column matrix to the left to obtain the target transmission signal that the downlink signal is mapped to the antenna unit.

In some feasible implementation manners, after the BBU initiates the joint calibration of the transmit channel, it can also initiate the joint calibration of the receive channel, wherein the above-mentioned correction compensation coefficient of the receive channel includes the initial correction compensation coefficient, the first correction compensation coefficient and the second correction compensation coefficient. For the manner of obtaining the correction compensation coefficient, refer to the implementation manner of obtaining the correction compensation coefficient of the transmission channel above, which will not be repeated here.

Further, after the BBU determines the second correction compensation coefficients of each receiving channel according to the above implementation, when the uplink signal is received, a diagonal matrix can be established, and the second correction compensation coefficients of each receiving channel are placed in the main matrix of the diagonal matrix. On the diagonal, the frequency domain signals transmitted by each receiving channel on subcarrier k and symbol l form a column matrix, and the above diagonal matrix is multiplied by the above column matrix to the left to obtain the calibrated uplink received signal.

Further, in the embodiment of the present invention, in the implementation process of the joint calibration of the receiving channel, for FDDRRU, since there is no transmission channel of the receiving frequency point, user equipment (User Equipment, UE) can be used to assist in the calibration of the receiving channel. Wherein, the aforementioned UE may correspond to multiple transmission channels. The UE transmits signals to the antenna unit, and the BBU obtains the channel estimation value of the receiving channel according to the digital correction signal fed back by the antenna unit, and determines the initial correction compensation coefficient of the receiving channel according to the above channel estimation value. The BBU can perform digital signal processing on the digital correction signal fed back by the antenna unit input by the input channel to obtain the channel estimation value of the receiving channel, and then take the reciprocal of the channel estimation value to obtain the initial correction compensation coefficient of the receiving channel.

Further, in order to improve the correction accuracy of the receiving channel, coordination between multiple cells can be carried out. In the uplink correction time slot TTI or certain symbols in the TTI, other interfering cells do not transmit signals, or by selecting multiple The UE performs auxiliary correction, and finally obtains a correction compensation coefficient with higher accuracy by using a statistical average method to improve the correction accuracy of the receiving channel.

In the embodiment of the present invention, the BBU can obtain the channel estimation value of each radio frequency channel according to the received correction signal, determine the initial correction compensation coefficient of each radio frequency channel according to the channel estimation value of each radio frequency channel, and then according to the time delay of each radio frequency channel Value, sampling time, etc., to correct and align the initial correction compensation coefficients of each RF channel, and obtain the corrected correction compensation coefficients, and then calibrate the transmit signals mapped to the antenna units by each RF channel to realize the RF under the FDD LTE system. The correction of the channel ensures the reciprocity of the uplink and downlink channels.

Referring to FIG. 7 , it is a schematic flow chart of a second embodiment of a radio frequency channel calibration method provided by an embodiment of the present invention. The calibration method of the radio frequency channel described in the embodiment of the present invention includes steps:

S201. The baseband unit BBU acquires the channel estimation value of the first radio frequency channel according to the digital correction signal fed back by the antenna unit, and determines the initial correction compensation coefficient of the first radio frequency channel according to the channel estimation value.

In the specific implementation, the specific implementation process of determining the initial correction compensation coefficient of the radio frequency channel described in the embodiment of the present invention can refer to step S101 in the first embodiment of the correction method of the radio frequency channel provided by the above embodiment of the present invention, here No longer.

S202. Acquire a delay value of each radio frequency channel according to a time domain channel response of a main path of each radio frequency channel.

In some feasible implementation manners, the main path described in the embodiments of the present invention may specifically be the path with the strongest transmission signal among multiple paths from the transmission channel to the antenna unit. In a specific implementation, the path of the antenna unit for each transmission channel to transmit signals has multiple paths, that is, the transmission signal that each transmission channel finally transmits to the antenna unit may be the superposition of signals arriving from multiple paths. The embodiment of the present invention The path with the strongest signal when reaching the antenna unit can be selected from the above multiple paths as the main path, and the time delay of the main path is used as the time delay of the transmission channel. Specifically, when obtaining the delay value of each transmission channel, the time delay of each transmission channel can be obtained according to the time-domain channel response of the main path of each transmission channel (that is, the time-domain channel response of the main path of the transmission channel) value.

S203. Acquire a delay difference between each radio frequency channel and the reference radio frequency channel according to the delay value of the reference radio frequency channel.

In some feasible implementation manners, the reference radio frequency channel described in the embodiments of the present invention can specifically be any radio frequency channel randomly selected from all the radio frequency channels that transmit signals to the antenna unit, that is, the radio frequency channel that can transmit signals to the antenna unit Multiple radio frequency channels randomly select a radio frequency channel, and use this radio frequency channel as a reference channel, such as Tx0. After the reference radio frequency channel is selected, the time delay of each radio frequency channel and the reference radio frequency channel can be obtained in combination with the delay value of each radio frequency channel (that is, the time delay of the main path of each radio frequency channel) according to the delay value of the reference radio frequency channel Difference. Assuming that the delay value of the main path of the transmission channel i is τ _tx,i , the reference radio frequency channel is the transmission channel 0, and its delay value is τ _tx,0 , then the delay difference between the transmission channel i and the transmission channel 0 can be obtained is τ' _tx,i =τ _tx,i -τ _tx,0 .

S204. Correct the initial calibration compensation coefficient of the first radio frequency channel according to the delay difference between the first radio frequency channel and the reference radio frequency channel, and the sampling time of the first radio frequency channel, to obtain the first radio frequency channel The first calibration compensation coefficient of the radio frequency channel.

In some feasible implementation manners, after obtaining the delay difference between any transmitting channel (ie, the first radio frequency channel) and the reference radio frequency channel, the first radio frequency can be calculated according to the above delay difference and the sampling time of the first radio frequency channel. The initial calibration compensation coefficient of the channel is corrected to obtain the first calibration compensation coefficient of the first radio frequency channel. Specifically, the initial correction compensation coefficient β _tx,i (k, l) of the first radio frequency channel (for example, transmit channel i) and the specified index Perform multiplication to obtain the first correction compensation coefficient β _{tx of the first radio frequency channel, i} (k, l) =, i.e. β _{tx, i} (k, l) = β _{tx, i} (k, l) Wherein, _τ'tx,i in the above specified index is the time delay difference between the transmission channel i and the reference radio frequency channel, and Ts is the sampling time of the transmission channel i.

Further, the calibration method of the radio frequency channel provided by the embodiment of the present invention can also compensate the initial phase of each radio frequency channel, so as to transform the delay value and phase in the time domain to the frequency domain for calibration. Specifically, the phase of each transmit channel can be extracted from the time domain channel response of each radio frequency channel, and the phase difference between each radio frequency channel and the reference radio frequency channel can be obtained according to the phase of the reference transmit channel, and then according to the phase difference between each radio frequency channel and the reference radio frequency channel The phase difference, and the delay value and sampling time of each radio frequency channel are used to correct the initial correction compensation coefficients of each radio frequency channel to obtain the first correction compensation coefficients of each radio frequency channel. Specifically, the phase information θ _{tx, i} can be extracted from the main path intensity α _tx,i e ^jθtx,i of each radio frequency channel, where α _tx,i is the amplitude of the main path intensity. After obtaining the phases of each radio frequency channel, the phase difference θ' _{tx of each radio frequency channel (such as transmitting channel i) and the reference radio frequency channel can be determined, i} = θ _{tx, i} - θ _{tx, 0} , and then according to the phase difference, and each The time delay value and the sampling time of the radio frequency channel (transmission channel i), correct the initial correction compensation coefficient of each radio frequency channel, and obtain the first correction compensation coefficient of each radio frequency channel, such as β _{tx, i} (k, l) = β _{tx, i} (k, l)

S205, the BBU performs alignment correction on the first correction compensation coefficient according to the correction compensation coefficient of the reference radio frequency channel to obtain a second correction compensation coefficient, and according to the second correction compensation coefficient, the transmit signal mapped to the antenna unit is corrected to calibrate.

In the specific implementation, the above-mentioned specific implementation process of performing alignment correction on the first correction compensation coefficients of each radio frequency channel can refer to step S103 in the first embodiment of the radio frequency channel correction method provided by the above-mentioned embodiment of the present invention, which will not be repeated here. repeat.

In the embodiment of the present invention, the BBU can obtain the channel estimation value of each radio frequency channel according to the received correction signal, determine the initial correction compensation coefficient of each radio frequency channel according to the channel estimation value of each radio frequency channel, and then according to the time delay of each radio frequency channel The initial correction compensation coefficients of each radio frequency channel are corrected and aligned, and the corrected correction compensation coefficients are obtained, and then the transmitted signals mapped from each radio frequency channel to the antenna unit can be calibrated. The embodiment of the present invention can also convert the time delay difference in the time domain to the frequency domain, and correct the radio frequency channel in the frequency domain, and also compensate the phase, and perform correction of the radio frequency channel in combination with the phase difference, so as to realize the FDD LTE system. The correction of the radio frequency channel ensures the reciprocity of the uplink and downlink channels.

Referring to FIG. 8 , it is a schematic structural diagram of a first embodiment of a radio frequency channel correction device provided by an embodiment of the present invention. The correction device for the radio frequency channel described in the embodiment of the present invention includes:

The determination module 10 is configured to obtain the channel estimation value of the first radio frequency channel according to the digital correction signal fed back by the antenna unit, and determine the initial correction compensation coefficient of the first radio frequency channel according to the channel estimation value.

The correction module 20 is configured to correct the initial correction compensation coefficient of the first radio frequency channel determined by the determination module according to the delay value and the sampling time of the first radio frequency channel to obtain a first correction compensation coefficient.

The calibration module 30 is configured to perform alignment correction on the first correction compensation coefficient corrected by the correction module according to the correction compensation coefficient of the reference radio frequency channel to obtain a second correction compensation coefficient.

The above-mentioned calibration module 30 is further configured to calibrate the transmitted signal mapped to the antenna unit according to the second correction compensation coefficient.

In a specific implementation, the radio frequency channel correction device described in the embodiment of the present invention can specifically be the BBU provided in the embodiment of the present invention, and the above-mentioned BBU can execute the first embodiment of the radio frequency channel correction method provided in the above embodiment of the present invention In the described implementation mode, the radio frequency channel correction device described in the embodiment of the present invention can implement the implementation mode described in the above embodiment through its determination module 10, correction module 20 and calibration module 30. For details, please refer to the above embodiment , which will not be repeated here.

Referring to FIG. 9 , it is a schematic structural diagram of a second embodiment of a radio frequency channel calibration device provided by an embodiment of the present invention. The correction device for the radio frequency channel described in the embodiment of the present invention includes:

The determination module 40 is configured to obtain the channel estimation value of the first radio frequency channel according to the digital correction signal fed back by the antenna unit, and determine the initial correction compensation coefficient of the first radio frequency channel according to the channel estimation value.

The correction module 60 is configured to correct the initial correction compensation coefficient of the first radio frequency channel determined by the determination module according to the delay value and the sampling time of the first radio frequency channel, to obtain a first correction compensation coefficient.

The calibration module 80 is configured to perform alignment correction on the first correction compensation coefficient corrected by the correction module according to the correction compensation coefficient of the reference radio frequency channel to obtain a second correction compensation coefficient.

The above-mentioned calibration module 80 is further configured to calibrate the transmit signal mapped to the antenna unit according to the second correction compensation coefficient.

In a specific implementation, the determination module 40, the correction module 60 and the correction module 80 can execute the implementation manners performed by the determination module 10, the correction module 20 and the correction module 30 described in the above embodiments, and can also perform the following other operations:

In some feasible implementation manners, the first radio frequency channel is a transmission channel;

The determination module 40 is specifically used for:

receiving a digital correction signal fed back by the antenna unit from a designated receiving channel, performing digital signal processing on the digital correction signal fed back by the antenna unit, and obtaining a channel estimation value of the transmitting channel;

Taking the reciprocal of the estimated channel value of the transmitting channel to obtain the initial correction compensation coefficient of the transmitting channel.

In some feasible implementation manners, the first radio frequency channel is a receiving channel;

The determination module 40 is specifically used for:

receiving a digital correction signal fed back by the antenna unit through the receiving channel, performing digital signal processing on the digital correction signal, and obtaining a channel estimation value of the receiving channel;

Taking the reciprocal of the estimated channel value of the receiving channel to obtain the initial correction compensation coefficient of the receiving channel.

In some feasible implementation manners, the above correction module 60 is specifically used for:

Multiplying the initial correction compensation coefficient of the first radio frequency channel by a specified index to correct the initial correction compensation coefficient of the first radio frequency channel to obtain a first correction compensation coefficient;

Among them, the specified index is The k is the identifier of the subcarrier, the τ _e is the delay value of the first radio frequency channel, the Ts is the sampling time, and the N is the number of fast Fourier transform FFT points.

In some feasible implementation manners, the above-mentioned calibration module 80 is specifically used for:

dividing the first correction compensation coefficient of the first radio frequency channel by the correction compensation coefficient of the reference radio frequency channel to obtain a second correction compensation coefficient of the first radio frequency channel;

Wherein, the reference radio frequency channel is a transmit channel randomly selected from at least one transmit channel that transmits signals to the antenna unit, or a receive channel randomly selected from at least one receive channel that receives the correction signal fed back by the antenna unit. aisle.

In some feasible implementation manners, the above-mentioned calibration module 80 is specifically used for:

Determining the second correction compensation coefficients of each radio frequency channel, and calibrating the transmit signals of the respective radio frequency channels according to the second correction compensation coefficients of each radio frequency channel, to obtain the target transmit signal mapped to the antenna unit.

In some feasible implementation manners, the above-mentioned calibration module 80 is specifically used for:

forming a diagonal matrix according to the second correction compensation coefficients of each of the radio frequency channels, and forming a column matrix according to the frequency domain signals transmitted by each of the radio frequency channels on the subcarrier k and symbol l;

multiplying the diagonal matrix to the left by the column matrix to obtain the target transmission signal mapped to the antenna unit;

Wherein, the elements on the main diagonal of the diagonal matrix are the second correction compensation coefficients of each of the radio frequency channels.

In some feasible implementation manners, the radio frequency channel correction device provided in the embodiment of the present invention further includes:

An acquisition module 50, configured to acquire the delay value of each radio frequency channel according to the time domain channel response of the main path of each radio frequency channel;

The acquiring module 50 is further configured to acquire the delay difference between each radio frequency channel and the reference radio frequency channel according to the delay value of the reference radio frequency channel;

The correction module 60 is further configured to perform an initial calibration compensation coefficient of the first radio frequency channel according to the delay difference between the first radio frequency channel and the reference radio frequency channel and the sampling time of the first radio frequency channel Correction to obtain a first correction compensation coefficient of the first radio frequency channel;

Wherein, the main path is the path with the strongest transmission signal among multiple paths from the radio frequency channel to the antenna unit, and the reference radio frequency channel is any radio frequency channel randomly selected in the radio frequency channels, with the The RF channel serves as the reference channel.

The compensation module 70 is configured to compensate the initial phase of each radio frequency channel, so as to transform the delay value and phase in the time domain to the frequency domain for calibration.

The above compensation module 70 is specifically used for:

extracting the phase of each of the radio frequency channels from the time domain channel response of each of the radio frequency channels, and obtaining the phase difference between each of the radio frequency channels and the reference radio frequency channel according to the phase of the reference radio frequency channel;

The correction module is further configured to perform an initial calibration compensation coefficient for each of the radio frequency channels according to the phase difference between each of the radio frequency channels and the reference radio frequency channel, and the delay value and sampling time of each of the radio frequency channels correction to obtain the first correction compensation coefficients for each of the radio frequency channels.

In specific implementation, the radio frequency channel correction device described in the embodiment of the present invention can implement the implementation methods described in the first embodiment and the second embodiment of the radio frequency channel correction method described in the embodiment of the present invention. Refer to the foregoing embodiments, and details are not repeated here.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the programs can be stored in computer-readable storage media. During execution, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM) and the like.

The above disclosures are only preferred embodiments of the present invention, and certainly cannot limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims (22)

1. the bearing calibration of a radio-frequency channel, it is characterised in that including:

Base Band Unit BBU obtains the channel estimation value of the first radio-frequency channel according to the digital correction signal that antenna element feeds back, and determines the initial calibration penalty coefficient of described first radio-frequency channel according to described channel estimation value;

The initial calibration penalty coefficient of described first radio-frequency channel is modified by described BBU according to time delay value and the sampling time of described first radio-frequency channel, obtains the first rectification building-out coefficient;

Described first rectification building-out coefficient is carried out alignment correction according to the rectification building-out coefficient of reference radio-frequency channel by described BBU, obtains the second rectification building-out coefficient, according to described second rectification building-out coefficient, the transmitting signal being mapped to described antenna element is calibrated.

2. the method for claim 1, it is characterised in that described first radio-frequency channel is transmission channel;

Described BBU obtains the channel estimation value of the first radio-frequency channel according to the digital correction signal that antenna element feeds back, and determines the initial calibration penalty coefficient of described first radio-frequency channel according to described channel estimation value, including:

Described BBU is from specifying the digital correction signal of antenna element feedback described in reception channel reception, and the digital correction signal that described antenna element is fed back carries out Digital Signal Processing, obtains the channel estimation value of described transmission channel;

Take the inverse of the channel estimation value of described transmission channel, obtain the initial calibration penalty coefficient of described transmission channel.

3. the method for claim 1, it is characterised in that described first radio-frequency channel is for receiving passage;

Described BBU obtains the channel estimation value of the first radio-frequency channel according to the digital correction signal that antenna element feeds back, and determines the initial calibration penalty coefficient of described first radio-frequency channel according to described channel estimation value, including:

The digital correction signal that described BBU is fed back by described reception channel reception antenna element, carries out Digital Signal Processing to described digital correction signal, obtains the channel estimation value of described reception passage;

Take the inverse of the channel estimation value of described reception passage, obtain the initial calibration penalty coefficient of described reception passage.

4. method as claimed in claim 2 or claim 3, it is characterised in that the initial calibration penalty coefficient of described first radio-frequency channel is modified by described BBU according to time delay value and the sampling time of described first radio-frequency channel, obtains the first rectification building-out coefficient, including:

The initial calibration penalty coefficient of described first radio-frequency channel and designated index are carried out multiplying by described BBU, are modified with the initial calibration penalty coefficient to described first radio-frequency channel, obtain the first rectification building-out coefficient;

Wherein, described designated index isDescribed k is the mark of subcarrier, described ��_eFor the time delay value of described first radio-frequency channel, described Ts is the sampling time, and described N is that fast Fourier transform FFT counts.

5. method as claimed in claim 4, it is characterised in that described first rectification building-out coefficient is carried out alignment correction according to the rectification building-out coefficient of reference radio-frequency channel by described BBU, obtains the second rectification building-out coefficient, including:

The described first rectification building-out coefficient of described first radio-frequency channel divided by the described rectification building-out coefficient with reference to radio-frequency channel, is obtained the second rectification building-out coefficient of the first radio-frequency channel by described BBU;

Wherein, described is the transmission channel randomly choosed from least one transmission channel transmitting signals to described antenna element with reference to radio-frequency channel, or receives the reception passage randomly choosed at least one reception passage of the correction signal of described antenna element feedback.

6. the method as described in claim 1-5 any one, it is characterized in that, described first radio-frequency channel transmits signals to any one in each transmission channel of described antenna element described in being, or each of correction signal receiving described antenna element feedback receives any one in passage.

7. method as claimed in claim 6, it is characterised in that described be calibrated including to the transmitting signal being mapped to described antenna element according to described second rectification building-out coefficient:

Determining the second rectification building-out coefficient of each radio-frequency channel, according to the second rectification building-out coefficient of radio-frequency channel each described, the transmitting signal of each radio-frequency channel described is calibrated, the purpose obtaining being mapped on described antenna element launches signal.

8. method as claimed in claim 7, it is characterised in that described according to the second rectification building-out coefficient of radio-frequency channel each described, the transmitting signal of each radio-frequency channel described is calibrated, the purpose obtaining being mapped on described antenna element launches signal, including:

According to the described second rectification building-out coefficient sets diagonally matrix of radio-frequency channel each described, and according to the frequency-region signal composition column matrix that radio-frequency channel each described is launched on described subcarrier k, symbol l;

By column matrix described in described diagonal matrix premultiplication, it is mapped to the purpose on described antenna element described in obtaining and launches signal;

Wherein, the second rectification building-out coefficient that element is each described radio-frequency channel on the leading diagonal of described diagonal matrix.

9. the method as described in claim 1-8 any one, it is characterized in that, when the transmission channel that described radio-frequency channel is in time domain, after the described initial calibration penalty coefficient determining described first radio-frequency channel according to described channel estimation value, described method also includes:

The time delay value of each described radio-frequency channel is obtained according to the time domain channel response in the main footpath of radio-frequency channel each described;

Time delay value according to reference radio-frequency channel, obtains each described radio-frequency channel and the described delay inequality with reference to radio-frequency channel;

According to described first radio-frequency channel and the described delay inequality with reference to radio-frequency channel, and the initial calibration penalty coefficient of described first radio-frequency channel is modified by the sampling time of described first radio-frequency channel, obtain the first rectification building-out coefficient of described first radio-frequency channel;

Wherein, described main footpath is that described radio-frequency channel transmits signals to and launches the path that signal is the strongest in multiple paths of antenna element, and described is the arbitrary radio-frequency channel randomly choosed in described radio-frequency channel with reference to radio-frequency channel, using described radio-frequency channel as reference channel.

10. method as claimed in claim 9, it is characterised in that described method also includes: the first phase of radio-frequency channel each described is compensated, the time delay value in time domain and phse conversion to be calibrated to frequency domain.

11. method as claimed in claim 10, it is characterised in that the described first phase of radio-frequency channel each described is compensated includes:

The phase place of each described radio-frequency channel is extracted from the time domain channel response of radio-frequency channel each described;

According to the described phase place with reference to radio-frequency channel, obtain each described radio-frequency channel and the described phase contrast with reference to radio-frequency channel;

According to radio-frequency channel each described and the described phase contrast with reference to radio-frequency channel, and the time delay value of each described radio-frequency channel and sampling time, the initial calibration penalty coefficient of radio-frequency channel each described is modified, obtains the first rectification building-out coefficient of each described radio-frequency channel.

12. the correcting unit of a radio-frequency channel, it is characterised in that including:

Determine module, for obtaining the channel estimation value of the first radio-frequency channel according to the digital correction signal of antenna element feedback, and determine the initial calibration penalty coefficient of described first radio-frequency channel according to described channel estimation value;

Correcting module, for the described initial calibration penalty coefficient determining described first radio-frequency channel that module determines being modified according to the time delay value of described first radio-frequency channel and sampling time, obtains the first rectification building-out coefficient;

Calibration module, the described first rectification building-out coefficient for described correcting module correction being obtained according to the rectification building-out coefficient of reference radio-frequency channel carries out alignment correction, obtains the second rectification building-out coefficient;

Described calibration module, is additionally operable to according to described second rectification building-out coefficient, the transmitting signal being mapped to described antenna element is calibrated.

13. device as claimed in claim 12, it is characterised in that described first radio-frequency channel is transmission channel;

Described determine module, specifically for:

Receiving the digital correction signal of antenna element feedback described in channel reception from specifying, the digital correction signal that described antenna element is fed back carries out Digital Signal Processing, obtains the channel estimation value of described transmission channel;

Take the inverse of the channel estimation value of described transmission channel, obtain the initial calibration penalty coefficient of described transmission channel.

14. device as claimed in claim 12, it is characterised in that described first radio-frequency channel is for receiving passage;

Described determine module specifically for:

By the digital correction signal of described reception channel reception antenna element feedback, described digital correction signal is carried out Digital Signal Processing, obtains the channel estimation value of described reception passage;

Take the inverse of the channel estimation value of described reception passage, obtain the initial calibration penalty coefficient of described reception passage.

15. the device as described in claim 13 or 14, it is characterised in that described correcting module specifically for:

The initial calibration penalty coefficient of described first radio-frequency channel and designated index are carried out multiplying, is modified with the initial calibration penalty coefficient to described first radio-frequency channel, obtains the first rectification building-out coefficient;

Wherein, described designated index isDescribed k is the mark of subcarrier, described ��_eFor the time delay value of described first radio-frequency channel, described Ts is the sampling time, and described N is that fast Fourier transform FFT counts.

16. device as claimed in claim 15, it is characterised in that described calibration module specifically for:

By the described first rectification building-out coefficient of described first radio-frequency channel divided by the described rectification building-out coefficient with reference to radio-frequency channel, obtain the second rectification building-out coefficient of the first radio-frequency channel;

Wherein, described is the transmission channel randomly choosed from least one transmission channel transmitting signals to described antenna element with reference to radio-frequency channel, or receives the reception passage randomly choosed at least one reception passage of the correction signal of described antenna element feedback.

17. the device as described in claim 12-16 any one, it is characterized in that, described first radio-frequency channel transmits signals to any one in each transmission channel of described antenna element described in being, or each of correction signal receiving described antenna element feedback receives any one in passage.

18. device as claimed in claim 17, it is characterised in that described calibration module specifically for:

Determining the second rectification building-out coefficient of each radio-frequency channel, according to the second rectification building-out coefficient of radio-frequency channel each described, the transmitting signal of each radio-frequency channel described is calibrated, the purpose obtaining being mapped on described antenna element launches signal.

19. device as claimed in claim 18, it is characterised in that described calibration module specifically for:

According to the described second rectification building-out coefficient sets diagonally matrix of radio-frequency channel each described, and according to the frequency-region signal composition column matrix that radio-frequency channel each described is launched on described subcarrier k, symbol l;

By column matrix described in described diagonal matrix premultiplication, it is mapped to the purpose on described antenna element described in obtaining and launches signal;

Wherein, the second rectification building-out coefficient that element is each described radio-frequency channel on the leading diagonal of described diagonal matrix.

20. the device as described in claim 12-19 any one, it is characterised in that when the transmission channel that described radio-frequency channel is in time domain, described device also includes:

Acquisition module, for obtaining the time delay value of each described radio-frequency channel according to the time domain channel response in the main footpath of radio-frequency channel each described;

Described acquisition module, is additionally operable to the time delay value according to reference radio-frequency channel, obtains each described radio-frequency channel and the described delay inequality with reference to radio-frequency channel;

Described correcting module, it is additionally operable to according to described first radio-frequency channel and the described delay inequality with reference to radio-frequency channel, and the initial calibration penalty coefficient of described first radio-frequency channel is modified by the sampling time of described first radio-frequency channel, obtain the first rectification building-out coefficient of described first radio-frequency channel;

Wherein, described main footpath is that described radio-frequency channel transmits signals to and launches the path that signal is the strongest in multiple paths of antenna element, and described is the arbitrary radio-frequency channel randomly choosed in described radio-frequency channel with reference to radio-frequency channel, using described radio-frequency channel as reference channel.

21. device as claimed in claim 20, it is characterised in that described device also includes:

Compensating module, for compensating the first phase of radio-frequency channel each described, the time delay value in time domain and phse conversion to be calibrated to frequency domain.

22. device as claimed in claim 21, it is characterised in that described compensating module specifically for:

From the time domain channel response of radio-frequency channel each described, extract the phase place of each described radio-frequency channel, according to the described phase place with reference to radio-frequency channel, obtain each described radio-frequency channel and the described phase contrast with reference to radio-frequency channel;

Described correcting module, it is additionally operable to according to radio-frequency channel each described and the described phase contrast with reference to radio-frequency channel, and the time delay value of each described radio-frequency channel and sampling time, the initial calibration penalty coefficient of radio-frequency channel each described is modified, obtains the first rectification building-out coefficient of each described radio-frequency channel.