CN105656815B - Method and device for calibrating radio frequency channel - Google Patents
Method and device for calibrating radio frequency channel Download PDFInfo
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- CN105656815B CN105656815B CN201410632335.5A CN201410632335A CN105656815B CN 105656815 B CN105656815 B CN 105656815B CN 201410632335 A CN201410632335 A CN 201410632335A CN 105656815 B CN105656815 B CN 105656815B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
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Abstract
The embodiment of the invention discloses a kind of bearing calibrations of radio-frequency channel, include: the channel estimation value that BBU obtains the first radio-frequency channel according to the digital correction signal that antenna element is fed back, and determines the initial calibration penalty coefficient of first radio-frequency channel according to the channel estimation value；The BBU is modified the initial calibration penalty coefficient of first radio-frequency channel according to the time delay value and sampling time of first radio-frequency channel, obtains the first rectification building-out coefficient；The BBU carries out alignment correction to the first rectification building-out coefficient according to the rectification building-out coefficient of reference radio-frequency channel, obtains the second rectification building-out coefficient, is calibrated according to the second rectification building-out coefficient to the transmitting signal for being mapped to the antenna element.The embodiment of the invention also discloses a kind of means for correctings of radio-frequency channel.The advantages of using the present invention, each radio-frequency channel can be corrected by having, and ensure the reciprocity of row of channels up and down.
Description
Technical field
The present invention relates to the bearing calibration of field of communication technology more particularly to a kind of radio-frequency channel and devices.
Background technique
In frequency division duplex (Frequency Division Duplex, FDD) long term evolution wireless access system (Long
Term Evolution, LTE) in system, when base station side angle spread is smaller, uplink and downlink channel reciprocity is utilized, improves power
It is worth precision, obtains array gain or multiuser multiplexing gain.Under FDD scene, it is necessary to assure the reciprocity of uplink and downlink radio-frequency channel
Property, i.e., each radio-frequency channel response is consistent in signal reception, and each radio-frequency channel responds unanimously in signal transmitting.When each in signal reception
In radio-frequency channel non_uniform response or signal transmitting when each radio-frequency channel non_uniform response, then need (to believe receiving channel
Number receive in each radio-frequency channel) or transmission channel (i.e. signal transmitting in each radio-frequency channel) be corrected.
The not no correcting scheme of the radio-frequency channel under FDD scene in the prior art, under FDD scene, if signal receives
In each radio-frequency channel non_uniform response or signal transmitting in each radio-frequency channel non_uniform response, then can not ensure uplink and downlink believe
The reciprocity in road.
Summary of the invention
The embodiment of the present invention provides bearing calibration and the device of a kind of radio-frequency channel, can be according to the channel estimation of radio-frequency channel
Value and time delay value, sampling time determine the rectification building-out coefficient of radio-frequency channel correction, can be mapped to antenna element to radio-frequency channel
Transmitting signal calibrated, ensure uplink and downlink channel reciprocity.
First aspect of the embodiment of the present invention provides a kind of bearing calibration of radio-frequency channel, can include:
Base Band Unit BBU obtains the channel estimation of the first radio-frequency channel according to the digital correction signal that antenna element is fed back
It is worth, and determines the initial calibration penalty coefficient of first radio-frequency channel according to the channel estimation value；
The BBU is according to the time delay value and sampling time of first radio-frequency channel to the initial of first radio-frequency channel
Rectification building-out coefficient is modified, and obtains the first rectification building-out coefficient；
The BBU carries out alignment school to the first rectification building-out coefficient according to the rectification building-out coefficient of reference radio-frequency channel
Just, the second rectification building-out coefficient is obtained, the transmitting for being mapped to the antenna element is believed according to the second rectification building-out coefficient
It number is calibrated.
With reference to first aspect, in the first possible implementation, first radio-frequency channel is transmission channel；
The BBU obtains the channel estimation value of the first radio-frequency channel according to the digital correction signal that antenna element is fed back, and
The initial calibration penalty coefficient of first radio-frequency channel is determined according to the channel estimation value, comprising:
The BBU receives the digital correction signal that the antenna element is fed back from specified receiving channel, to the antenna list
The digital correction signal of member feedback carries out Digital Signal Processing, obtains the channel estimation value of the transmission channel；
The inverse for taking the channel estimation value of the transmission channel obtains the initial calibration penalty coefficient of the transmission channel.
With reference to first aspect, in the second possible implementation, first radio-frequency channel is receiving channel；
The BBU obtains the channel estimation value of the first radio-frequency channel according to the digital correction signal that antenna element is fed back, and
The initial calibration penalty coefficient of first radio-frequency channel is determined according to the channel estimation value, comprising:
The digital correction signal that the BBU is fed back by the receiving channel receiving antenna unit, to the figure adjustment
Signal carries out Digital Signal Processing, obtains the channel estimation value of the receiving channel；
The inverse for taking the channel estimation value of the receiving channel obtains the initial calibration penalty coefficient of the receiving channel.
The first possible implementation or second of first aspect possible implementation with reference to first aspect,
In three kinds of possible implementations, the BBU is according to the time delay value and sampling time of first radio-frequency channel to described first
The initial calibration penalty coefficient of radio-frequency channel is modified, and obtains the first rectification building-out coefficient, comprising:
The initial calibration penalty coefficient of first radio-frequency channel and designated index are carried out multiplying by the BBU, with
The initial calibration penalty coefficient of first radio-frequency channel is modified, the first rectification building-out coefficient is obtained；
Wherein, the designated index isThe k is the mark of subcarrier, the τeFor first radio frequency
The time delay value in channel, the Ts are the sampling time, and the N is Fast Fourier Transform (FFT) FFT points.
The third possible implementation with reference to first aspect, in the fourth possible implementation, the BBU according to
Alignment correction is carried out to the first rectification building-out coefficient with reference to the rectification building-out coefficient of radio-frequency channel, obtains the second rectification building-out
Coefficient, comprising:
The BBU is by the first rectification building-out coefficient of first radio-frequency channel divided by described with reference to radio-frequency channel
Rectification building-out coefficient obtains the second rectification building-out coefficient of the first radio-frequency channel；
Wherein, it is described with reference to radio-frequency channel be from least one transmission channel for transmit signals to the antenna element with
One transmission channel of machine selection, or receive antenna element feedback correction signal at least one receiving channel in it is random
One receiving channel of selection.
It is any into the 4th kind of possible implementation of first aspect with reference to first aspect, in the 5th kind of possible realization
In mode, first radio-frequency channel transmits signals to any one in each transmission channel of the antenna element for described in
It is a, or receive antenna element feedback correction signal each receiving channel in any one.
5th kind of possible implementation with reference to first aspect, it is in a sixth possible implementation, described according to institute
It states the second rectification building-out coefficient and the transmitting signal for being mapped to the antenna element calibrate and include:
The the second rectification building-out coefficient for determining each radio-frequency channel, according to the second rectification building-out of each radio-frequency channel
Coefficient calibrates the transmitting signal of each radio-frequency channel, obtains the purpose being mapped on antenna element transmitting letter
Number.
6th kind of possible implementation with reference to first aspect, in the 7th kind of possible implementation, the basis is each
Second rectification building-out coefficient of a radio-frequency channel calibrates the transmitting signal of each radio-frequency channel, is mapped
Purpose on to the antenna element emits signal, comprising:
According to the second rectification building-out coefficient sets of each radio-frequency channel diagonally matrix, and according to each described
The frequency-region signal that radio-frequency channel emits on the subcarrier k, symbol l forms column matrix；
By column matrix described in the diagonal matrix premultiplication, the purpose transmitting letter being mapped on the antenna element is obtained
Number；
Wherein, the element on the leading diagonal of the diagonal matrix is the second rectification building-out system of each radio-frequency channel
Number.
It is any into the 7th kind of possible implementation of first aspect with reference to first aspect, in the 8th kind of possible realization
It is described to determine described first according to the channel estimation value when the radio-frequency channel is the transmission channel in time domain in mode
After the initial calibration penalty coefficient of radio-frequency channel, the method also includes:
The time delay value of each radio-frequency channel is obtained according to the time domain channel response of the main diameter of each radio-frequency channel；
According to the time delay value of reference radio-frequency channel, each radio-frequency channel and the time delay with reference to radio-frequency channel are obtained
Difference；
According to first radio-frequency channel and the delay inequality with reference to radio-frequency channel and first radio-frequency channel
Sampling time is modified the initial calibration penalty coefficient of first radio-frequency channel, obtains the of first radio-frequency channel
One rectification building-out coefficient；
Wherein, it is most strong to transmit signals to transmitting signal in multiple paths of antenna element for the radio-frequency channel for the main diameter
Path, it is described with reference to radio-frequency channel be the radio-frequency channel in randomly selected any radio-frequency channel, with the radio-frequency channel
As reference channel.
8th kind of possible implementation with reference to first aspect, in the 9th kind of possible implementation, the method is also
Include: to be compensated to the first phase of each radio-frequency channel, by time domain time delay value and phse conversion it is enterprising to frequency domain
Row calibration.
9th kind of possible implementation with reference to first aspect, it is described to each in the tenth kind of possible implementation
The first phase of the radio-frequency channel, which compensates, includes:
The phase of each radio-frequency channel is extracted from the time domain channel response of each radio-frequency channel；
According to the phase with reference to radio-frequency channel, each radio-frequency channel and the phase with reference to radio-frequency channel are obtained
Potential difference；
According to each radio-frequency channel and the phase difference with reference to radio-frequency channel and each radio-frequency channel
Time delay value and sampling time are modified the initial calibration penalty coefficient of each radio-frequency channel, obtain each described penetrate
The first rectification building-out coefficient in frequency channel.
Second aspect of the embodiment of the present invention provides a kind of means for correcting of radio-frequency channel, can include:
Determining module, the digital correction signal for being fed back according to antenna element obtain the channel estimation of the first radio-frequency channel
It is worth, and determines the initial calibration penalty coefficient of first radio-frequency channel according to the channel estimation value；
Correction module, for being determined according to the time delay value and sampling time of first radio-frequency channel to the determining module
The initial calibration penalty coefficient of first radio-frequency channel be modified, obtain the first rectification building-out coefficient；
Calibration module, the institute that the correction module is corrected for the rectification building-out coefficient according to reference radio-frequency channel
It states the first rectification building-out coefficient and carries out alignment correction, obtain the second rectification building-out coefficient；
The calibration module is also used to the transmitting according to the second rectification building-out coefficient to the antenna element is mapped to
Signal is calibrated.
In conjunction with second aspect, in the first possible implementation, first radio-frequency channel is transmission channel；
The determining module, is specifically used for:
The digital correction signal that the antenna element is fed back is received from specified receiving channel, to antenna element feedback
Digital correction signal carries out Digital Signal Processing, obtains the channel estimation value of the transmission channel；
The inverse for taking the channel estimation value of the transmission channel obtains the initial calibration penalty coefficient of the transmission channel.
In conjunction with second aspect, in the second possible implementation, first radio-frequency channel is receiving channel；
The determining module is specifically used for:
The digital correction signal fed back by the receiving channel receiving antenna unit carries out the digital correction signal
Digital Signal Processing obtains the channel estimation value of the receiving channel；
The inverse for taking the channel estimation value of the receiving channel obtains the initial calibration penalty coefficient of the receiving channel.
The first possible implementation or second of second aspect possible implementation in conjunction with second aspect,
In three kinds of possible implementations, the correction module is specifically used for:
The initial calibration penalty coefficient of first radio-frequency channel and designated index are subjected to multiplying, to described the
The initial calibration penalty coefficient of one radio-frequency channel is modified, and obtains the first rectification building-out coefficient；
Wherein, the designated index isThe k is the mark of subcarrier, the τeFor first radio frequency
The time delay value in channel, the Ts are the sampling time, and the N is Fast Fourier Transform (FFT) FFT points.
The third possible implementation in conjunction with second aspect, in the fourth possible implementation, the calibrating die
Block is specifically used for:
The first rectification building-out coefficient of first radio-frequency channel is mended divided by the correction with reference to radio-frequency channel
Coefficient is repaid, the second rectification building-out coefficient of the first radio-frequency channel is obtained；
Wherein, it is described with reference to radio-frequency channel be from least one transmission channel for transmit signals to the antenna element with
One transmission channel of machine selection, or receive antenna element feedback correction signal at least one receiving channel in it is random
One receiving channel of selection.
In conjunction with any in the 4th kind of possible implementation of second aspect to second aspect, in the 5th kind of possible realization
In mode, first radio-frequency channel transmits signals to any one in each transmission channel of the antenna element for described in
It is a, or receive antenna element feedback correction signal each receiving channel in any one.
In conjunction with the 5th kind of possible implementation of second aspect, in a sixth possible implementation, the calibrating die
Block is specifically used for:
The the second rectification building-out coefficient for determining each radio-frequency channel, according to the second rectification building-out of each radio-frequency channel
Coefficient calibrates the transmitting signal of each radio-frequency channel, obtains the purpose being mapped on antenna element transmitting letter
Number.
In conjunction with the 6th kind of possible implementation of second aspect, in the 7th kind of possible implementation, the calibrating die
Block is specifically used for:
According to the second rectification building-out coefficient sets of each radio-frequency channel diagonally matrix, and according to each described
The frequency-region signal that radio-frequency channel emits on the subcarrier k, symbol l forms column matrix；
By column matrix described in the diagonal matrix premultiplication, the purpose transmitting letter being mapped on the antenna element is obtained
Number；
Wherein, the element on the leading diagonal of the diagonal matrix is the second rectification building-out system of each radio-frequency channel
Number.
In conjunction with any in the 7th kind of possible implementation of second aspect to second aspect, in the 8th kind of possible realization
In mode, when the radio-frequency channel is the transmission channel in time domain, described device further include:
Module is obtained, the time domain channel response for the main diameter according to each radio-frequency channel obtains each radio frequency
The time delay value in channel；
The acquisition module is also used to the time delay value according to reference radio-frequency channel, obtains each radio-frequency channel and institute
State the delay inequality with reference to radio-frequency channel；
The correction module, is also used to according to first radio-frequency channel and the delay inequality with reference to radio-frequency channel, with
And the sampling time of first radio-frequency channel is modified the initial calibration penalty coefficient of first radio-frequency channel, obtains
First rectification building-out coefficient of first radio-frequency channel；
Wherein, it is most strong to transmit signals to transmitting signal in multiple paths of antenna element for the radio-frequency channel for the main diameter
Path, it is described with reference to radio-frequency channel be the radio-frequency channel in randomly selected any radio-frequency channel, with the radio-frequency channel
As reference channel.
In conjunction with the 8th kind of possible implementation of second aspect, in the 9th kind of possible implementation, described device is also
Include:
Compensating module is compensated for the first phase to each radio-frequency channel, by the time delay value and phase in time domain
It is calibrated in bit map to frequency domain.
In conjunction with the 9th kind of possible implementation of second aspect, in the tenth kind of possible implementation, the compensation mould
Block is specifically used for:
The phase that each radio-frequency channel is extracted from the time domain channel response of each radio-frequency channel, according to described
With reference to the phase of radio-frequency channel, each radio-frequency channel and the phase difference with reference to radio-frequency channel are obtained；
The correction module, is also used to according to each radio-frequency channel and the phase difference with reference to radio-frequency channel, with
And time delay value and the sampling time of each radio-frequency channel, the initial calibration penalty coefficient of each radio-frequency channel is carried out
Amendment, obtains the first rectification building-out coefficient of each radio-frequency channel.
The digital correction signal that the embodiment of the present invention can be fed back according to antenna element obtains the channel estimation value of radio-frequency channel,
The initial calibration penalty coefficient of radio-frequency channel is determined according to the channel estimation value of radio-frequency channel, and according to the time delay value of radio-frequency channel
It is modified with initial calibration penalty coefficient of the sampling time to radio-frequency channel, and then according to revised rectification building-out coefficient pair
The transmitting signal for being mapped to antenna element is calibrated, and is realized the correction of the radio-frequency channel under frequency division duplex system, can be ensured
The reciprocity of down channel.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a schematic diagram of base station architecture provided in an embodiment of the present invention；
Fig. 2 is another schematic diagram of base station architecture provided in an embodiment of the present invention；
Fig. 3 is another schematic diagram of base station architecture provided in an embodiment of the present invention；
Fig. 4 is another schematic diagram of base station architecture provided in an embodiment of the present invention；
Fig. 5 is the first embodiment flow diagram of the bearing calibration of radio-frequency channel provided in an embodiment of the present invention；
Fig. 6 is another schematic diagram of base station architecture provided in an embodiment of the present invention；
Fig. 7 is the second embodiment flow diagram of the bearing calibration of radio-frequency channel provided in an embodiment of the present invention；
Fig. 8 is the schematic structural diagram of the first embodiment of the means for correcting of radio-frequency channel provided in an embodiment of the present invention；
Fig. 9 is the schematic structural diagram of the second embodiment of the means for correcting of radio-frequency channel provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In the specific implementation, the bearing calibration of radio-frequency channel described in the embodiment of the present invention is mainly to FDD LTE system
Radio-frequency channel in system is corrected, wherein above-mentioned radio-frequency channel includes: that each radio-frequency channel during signal receives (also referred to as connects
Receive channel) or signal transmitting in each radio-frequency channel (also referred to as transmission channel).Radio frequency described in the embodiment of the present invention
The bearing calibration in channel is applicable to a variety of base station architectures, include: in above-mentioned base station architecture Base Band Unit (Baseband Unit,
BBU), remote radio unit (Remote Radio Unit, RRU) and antenna element etc..Wherein, above-mentioned RRU may include 2 ends
The RRU of RRU and 4 port of mouth, wherein above-mentioned antenna element may also comprise the antenna element of 2 ports and the day of 4 ports
Line unit etc., herein with no restrictions.It is a schematic diagram of base station architecture provided in an embodiment of the present invention, shown in Fig. 1 such as Fig. 1
Base station architecture can be made of the antenna element of BBU and the RRU of 4 ports, 4 ports.It is provided in an embodiment of the present invention such as Fig. 2
Another schematic diagram of base station architecture, base station architecture shown in Fig. 2 can be by BBU, the antenna of RRU and 14 port of 22 ports
Unit composition.Fig. 3 is another schematic diagram of base station architecture provided in an embodiment of the present invention, and base station architecture shown in Fig. 3 can be by
BBU, 14 port RRU and 22 port antenna element composition.Fig. 4 is the another of base station architecture provided in an embodiment of the present invention
One schematic diagram, base station architecture shown in Fig. 4 can be made of the RRU of BBU and 22 port, the antenna element of 22 ports.Tool
During body is realized, in above-mentioned each base station architecture, BBU and RRU can be two independent functional modules, and BBU can also be integrated into RRU
In portion, or the partial function of BBU is integrated into RRU, herein with no restrictions.
The bearing calibration of radio-frequency channel described in the embodiment of the present invention is applicable to described in above-mentioned Fig. 1 to Fig. 4
In base station architecture, other base station architectures are equally applicable to, herein with no restrictions.
It is the first embodiment flow diagram of the bearing calibration of radio-frequency channel provided in an embodiment of the present invention referring to Fig. 5.
The bearing calibration of radio-frequency channel described in the embodiment of the present invention, comprising steps of
S101, Base Band Unit BBU obtain the channel of the first radio-frequency channel according to the digital correction signal that antenna element is fed back
Estimated value, and determine according to the channel estimation value initial calibration penalty coefficient of first radio-frequency channel.
In some possible embodiments, BBU can pass through common public radio interface (Common Public
Radio Interface, CPRI) with RRU connection is established, digital signal can be passed to RRU by CPRI interface by BBU, with logical
It crosses RRU and sends signal to antenna element.As Fig. 6, BBU can send digital signal by CPRI interface A0 and C0 and connect to RRU, RRU
After the digital signal for receiving BBU transmission, then above-mentioned digital signal can be converted to radio frequency correction signal, and pass through radio-frequency cable
Radio frequency correction signal is sent to antenna element by (A1- > A2, B1- > B2, C1- > C2 and D1- > D2 in such as Fig. 6).RRU is sent
To antenna element radio frequency correction signal after the signal coupled communication of antenna element, from RRU internal proprietary channel or
For measuring the feedback channel of transmission channel quality radio frequency correction signal loopback.RRU can turn the radio frequency correction signal of loopback
It is changed to digital correction signal and returns to BBU, BBU can (i.e. antenna element be fed back according to the digital correction signal that antenna element is fed back
Radio frequency correction signal digital correction signal is converted to by RRU) obtain the first radio-frequency channel channel estimation value.
In the specific implementation, radio-frequency channel described in the embodiment of the present invention may include transmission channel and receiving channel, BBU
The joint correction of transmission channel can be initiated first, then initiates the joint correction of receiving channel.It mainly will initiate to emit with BBU below
For the bearing calibration of the radio-frequency channel of the joint timing in channel, to the correction side of radio-frequency channel provided in an embodiment of the present invention
Method is specifically described.
In the specific implementation, the first radio-frequency channel described in the embodiment of the present invention is any one in multiple transmission channels
It is a, that is, for will be detailed below the first radio-frequency channel, the aligning step of each transmission channel is specifically described.
In some possible embodiments, BBU can select any one transmission channel (to be set as from multiple transmission channels
One radio-frequency channel) corresponding receiving channel receives digital correction signal, according to above-mentioned digital correction signal determine that the transmitting is logical
The channel estimation value in road.It, can be from same in the specific implementation, when BBU is corrected each transmission channel in multiple transmission channels
One receiving channel (i.e. specified receiving channel) can connect when receiving digital correction signal, i.e. digital correction signal loopback from same
Channel loopback is received, BBU can determine the channel estimation value of transmission channel according to the digital correction signal received from the receiving channel.
Specifically, BBU can launch when transmitting signals to antenna element from multiple transmission channels, when signal receives, BBU can be from above-mentioned
The signal that the corresponding receiving channel receiving antenna unit of multiple transmission channels is fed back by RRU, and then may select from specified connect
Receive the reception of channel (digital signal that the correction of all transmission channels all selects the same receiving channel to receive is corrected)
The signal arrived carries out Digital Signal Processing, obtains the channel estimation value of the first radio-frequency channel.
In the specific implementation, can then be estimated according to above-mentioned channel after BBU acquires the channel estimation value of the first radio-frequency channel
Evaluation determines the initial calibration penalty coefficient of the first radio-frequency channel.Lead to specifically, BBU can obtain corresponding receive of transmission channel i
The digital correction signal that road receives determines that channel of the above-mentioned digital correction signal on the channel that subcarrier k and symbol are l is estimated
Evaluation hTx, i(k, l).Such as the digital correction signal that Fig. 6, BBU can be fed back according to the transmission channel 0 of RRU0, determine that above-mentioned transmitting is logical
The channel estimation value in road 0 is hTx, 0(k, l).BBU can also be (i.e. specified to connect according to the corresponding receiving channel of transmission channel 1 of RRU1
Receive channel) feedback digital correction signal, determine above-mentioned transmission channel 1 channel estimation value be hTx, 1(k, l)), and then can root
According to the channel estimation value of above-mentioned transmission channel 0 perhaps transmission channel 1 determine transmission channel 0 initial calibration penalty coefficient or
The initial calibration penalty coefficient of transmission channel 1.Specifically, BBU can use the inverse of the channel estimation value of above-mentioned transmission channel 0, obtain
To the initial calibration penalty coefficient β of transmission channel 0Tx, 0(k, l))=1/ (hTx, 0(k, l)), take the channel of above-mentioned transmission channel 1 to estimate
The inverse of evaluation obtains the initial calibration penalty coefficient β of transmission channel 1Tx, 1(k, l))=1/ (hTx, 1(k, 1)).
In embodiments of the present invention, since the correction signal of transmission channel is possible to not be all sub- loads in system bandwidth
Have on wave, at this time it is contemplated that obtaining the domain channel response of all subcarriers of Whole frequency band by the way of near stratum exhaust
The domain channel response that other modes obtain all subcarriers can also be used, herein with no restrictions in (i.e. channel estimation value).
S102, the BBU are according to the time delay value and sampling time of first radio-frequency channel to first radio-frequency channel
Initial calibration penalty coefficient be modified, obtain the first rectification building-out coefficient.
In embodiments of the present invention, such as Fig. 6, it is assumed that with a transmission channel (such as Tx0) in RRU0 be logical with reference to radio frequency
Road, if the correction signal that receives of RRU0 from A1 interface loopback, since the correction signal of Tx0 transmitting is anti-directly inside RRU0
It penetrates, does not pass through the cable of A1 to A2, and other points such as correction signal of B2 to A1, C2 to A1 or D2 to A1 is all by penetrating
Frequency cable, and transmitting and reception will pass through RF cable, therefore the cable time delay that will have 2 times.That is, in above-mentioned scene
In, the correction loopback signal of Tx0 is compared with few 2 times of the cable time delay of the correction signal of other transmission channels, so needing to each hair
The initial calibration penalty coefficient for penetrating channel is modified, and obtains revised rectification building-out coefficient.
In some possible embodiments, when BBU is modified the initial calibration penalty coefficient of the first radio-frequency channel,
The initial calibration penalty coefficient of the first radio-frequency channel can be modified according to the time delay value and sampling time of the first radio-frequency channel,
Obtain the first rectification building-out coefficient of the first radio-frequency channel, the i.e. revised school of initial calibration penalty coefficient of the first radio-frequency channel
Positive penalty coefficient.In embodiments of the present invention, above-mentioned radio-frequency channel (including the first radio-frequency channel and other each radio-frequency channels)
Time delay value τe, and then obtained by the configuration such as operational administrative area (Operation Manager, OM) network managements tool, Huo Zheji
Directly scene input when station rack structure is installed.Specifically, BBU can be by the initial calibration penalty coefficient of above-mentioned first radio-frequency channel and finger
Determine index and carry out multiplying, is modified by initial calibration penalty coefficient of the above-mentioned multiplying to the first radio-frequency channel,
Obtain the first rectification building-out coefficient.Wherein, above-mentioned designated index isWherein, k is the mark of subcarrier, τeFor institute
The time delay value of the first radio-frequency channel is stated, Ts is the sampling time, and N is Fast Fourier Transform (FFT) (Fast Fourier
Transformation, FFT) points.In LTE system, corresponding 20M bandwidth system, sample frequency can be 30.72M, above-mentioned to adopt
Sample time Ts is the inverse of the sample frequency.For example, compensating system to the initial calibration of transmission channel 0 by taking transmission channel 0 as an example
When number is modified, the initial calibration penalty coefficient of transmission channel 0 and above-mentioned specified function can be subjected to multiplying, be sent out
Penetrate the first rectification building-out coefficient in channel 0.For example, βTx, 0(k, l) 1=βTx, 0(k, l)Wherein, above-mentioned βTx, 0(k,
It l) is the initial calibration penalty coefficient of transmission channel 0, βTx, 0(k, l) 1 is after the initial calibration penalty coefficient of transmission channel 0 is corrected
Rectification building-out coefficient (i.e. the first rectification building-out coefficient of transmission channel 0), τeFor the time delay value of the transmission channel 0, i.e. A1
To the propagation delay of A2, Ts is the sampling time of transmission channel 0.
In the specific implementation, BBU can be carried out according to initial calibration penalty coefficient of the above-mentioned correcting mode to each transmission channel
Amendment, obtains the first rectification building-out coefficient of each transmission channel, is not described in detail herein.
S103, the BBU carry out the first rectification building-out coefficient according to the rectification building-out coefficient of reference radio-frequency channel
Alignment correction, obtains the second rectification building-out coefficient, according to the second rectification building-out coefficient to being mapped to the antenna element
Transmitting signal is calibrated.
In some possible embodiments, in order to avoid cause after all compensation after rectification building-out channel be delayed together or
Time bigger in advance can carry out alignment correction to the first rectification building-out coefficient of each transmission channel, obtain the second correction
Penalty coefficient, the transmitting signal for being mapped to antenna element to each transmission channel further according to the second rectification building-out coefficient carry out school
Standard eliminates influence of the time delay to the transmitting signal for being mapped to antenna element.Specifically, BBU (can specifically may be used from each radio-frequency channel
For transmission channel) in one radio-frequency channel of random selection be used as and refer to radio-frequency channel, such as transmission channel 0 (Tx0), with above-mentioned ginseng
The references object that radio-frequency channel is alignment correction is examined, alignment school is carried out to the first rectification building-out coefficient of other each radio-frequency channels
Just.BBU is to the first radio-frequency channel (such as the first rectification building-out factor beta of transmission channel i)Tx, i(k, l) 1 carries out alignment correction
When, it can be by the first rectification building-out factor beta of transmission channel iTx, i(k, l) 1 divided by reference radio-frequency channel rectification building-out coefficient (i.e.
With reference to the first rectification building-out factor beta of radio-frequency channelTx, 0(k, l) 1), obtain the second rectification building-out coefficient of the first radio-frequency channel
βTx, i(k, l) 2, such as βTx, i(k, l) 2=βTx, i(k, l) 1/ βTx, 0(k, l) 1.
In embodiments of the present invention, if BBU is corrected to transmission channel, can be selected from each transmission channel with
Machine selects a transmission channel as with reference to radio-frequency channel, if BBU is corrected to receiving channel, can lead to from each receive
A receiving channel is randomly choosed in road to be used as with reference to radio-frequency channel.That is, reference video described in the embodiment of the present invention is logical
Road can be the correction of any one or receiving antenna unit feedback in the multiple transmission channels for transmit signals to antenna element
Any one in multiple receiving channels of signal, can specifically select, herein with no restrictions according to actual scene.
In the specific implementation, BBU can be according to above-mentioned alignment correcting mode to the first rectification building-out coefficient of each radio-frequency channel
(βTx, i(k, l) 1) alignment correction is carried out, obtain the second rectification building-out coefficient (β of each radio-frequency channelTx, i(k, l) 2), herein not
It is described in detail again.
In some possible embodiments, BBU, which is determined, transmits signals to the second of each radio-frequency channel of antenna element
After rectification building-out coefficient, then the transmitting of each radio-frequency channel can be believed according to the second rectification building-out coefficient of each radio-frequency channel
It number is calibrated, obtains the purpose transmitting signal for being mapped to antenna element.Specifically, BBU can be according to the of each radio-frequency channel
Two correction penalty coefficients form diagonal matrix, wherein the element on the leading diagonal of above-mentioned diagonal matrix is each radio-frequency channel
The second rectification building-out coefficient.BBU can also be formed according to the frequency-region signal that each radio-frequency channel emits on subcarrier k, symbol l
Column matrix, then by the above-mentioned above-mentioned column matrix of diagonal matrix premultiplication, obtain being mapped to the purpose transmitting signal on antenna element.Specifically
, when downlink signal emits, a diagonal matrix can be established, and the second rectification building-out coefficient of each transmission channel is placed on
On the leading diagonal of diagonal matrix, the frequency-region signal that each transmission channel is emitted on subcarrier k, symbol l forms column matrix,
By the above-mentioned above-mentioned column matrix of diagonal matrix premultiplication, the purpose transmitting signal that downlink signal is mapped on antenna element is obtained.
In some possible embodiments, after the joint that BBU initiates transmission channel corrects, receiving channel can also be initiated
Joint correction, wherein the rectification building-out coefficient of above-mentioned receiving channel, including initial calibration penalty coefficient, the first rectification building-out
The acquisition modes of coefficient and the second rectification building-out coefficient can be found in the realization of the acquisition of the rectification building-out coefficient of above-mentioned transmission channel
Mode, details are not described herein.
Further, after BBU has determined the second rectification building-out coefficient of each receiving channel according to above-mentioned implementation,
When uplink signal receives, a diagonal matrix can be established, the second rectification building-out coefficient of each receiving channel is placed on diagonally
On the leading diagonal of matrix, the frequency-region signal that each receiving channel is emitted on subcarrier k, symbol l forms column matrix, will be upper
State the above-mentioned column matrix of diagonal matrix premultiplication, the uplink receiving signal after being calibrated.
Further, in embodiments of the present invention, during the realization of the joint correction of receiving channel, for FDD
RRU is carried out due to not having to receive the transmitting path of frequency point so user equipment (User Equipment, UE) auxiliary can be used
The correction of receiving channel.Wherein, above-mentioned UE can correspond to multiple transmission channels.UE transmits signals to antenna element, and BBU is according to antenna
The digital correction signal of unit feedback obtains the channel estimation value of receiving channel, determines receiving channel according to above-mentioned channel estimation value
Initial calibration penalty coefficient.The digital correction signal for the antenna element feedback that BBU can input above-mentioned input channel counts
Word signal processing, obtains the channel estimation value of receiving channel, then takes the inverse of above-mentioned channel estimation value, obtains the first of receiving channel
Beginning rectification building-out coefficient.
It further, can be by being coordinated between multiple cell, in uplink school in order to improve the correction accuracy of receiving channel
On certain symbols in positive time slot TTI or in the TTI, other interfered cells do not emit signal, or multiple by selecting
UE carries out auxiliary corrective, finally the higher rectification building-out coefficient of precision is obtained using statistical average mode, to improve receiving channel
Correction accuracy.
In embodiments of the present invention, BBU can obtain the channel estimation of each radio-frequency channel according to the correction signal received
Value, the initial calibration penalty coefficient of each radio-frequency channel is determined according to the channel estimation value of each radio-frequency channel, further according to each
Time delay value, sampling time of radio-frequency channel etc. are modified and are aligned school to the initial calibration penalty coefficient of each radio-frequency channel
Just, the rectification building-out coefficient after being corrected, and then the transmitting signal that antenna element can be mapped to each radio-frequency channel carries out
The correction of the radio-frequency channel under FDD LTE system is realized in calibration, ensures the reciprocity of uplink and downlink channel.
It is the second embodiment flow diagram of the bearing calibration of radio-frequency channel provided in an embodiment of the present invention referring to Fig. 7.
The bearing calibration of radio-frequency channel described in the embodiment of the present invention, comprising steps of
S201, Base Band Unit BBU obtain the channel of the first radio-frequency channel according to the digital correction signal that antenna element is fed back
Estimated value, and determine according to the channel estimation value initial calibration penalty coefficient of first radio-frequency channel.
In the specific implementation, the initial calibration penalty coefficient of determining radio-frequency channel described in the embodiment of the present invention is specific
Realization process can be found in the step in the first embodiment of the bearing calibration of the radio-frequency channel of embodiments of the present invention offer
S101, details are not described herein.
S202, according to the time domain channel response of the main diameter of each radio-frequency channel obtain each radio-frequency channel when
Prolong value.
In some possible embodiments, concretely transmission channel emits main diameter described in the embodiment of the present invention
Signal emits the strongest path of signal into multiple paths of antenna element.In the specific implementation, each transmission channel emits signal
The path of antenna element have multiple paths, i.e., the transmitting signal that each transmission channel is finally emitted to antenna element may
It is the superposition for the signal that multiple paths reach, the letter when embodiment of the present invention can select to reach antenna element from above-mentioned multiple paths
Number strongest path is as main diameter, using the time delay of main diameter as the time delay of the transmission channel.Specifically, obtaining each transmission channel
Time delay value when, can (i.e. the time domain of the main diameter of the transmission channel be believed according to the time domain channel response of the main diameter of each transmission channel
Road response) obtain the time delay value of each transmission channel.
S203 obtains each radio-frequency channel and described with reference to radio-frequency channel according to the time delay value of reference radio-frequency channel
Delay inequality.
In some possible embodiments, described in the embodiment of the present invention concretely to emit with reference to radio-frequency channel
Signal randomly selected any radio-frequency channel into all radio-frequency channels of antenna element, that is, can be from transmitting signals to antenna list
Multiple radio-frequency channels of member randomly choose a radio-frequency channel, using the radio-frequency channel as reference channel, such as Tx0.Selected ginseng
After examining radio-frequency channel, then can according to the time delay value of reference radio-frequency channel, in conjunction with each radio-frequency channel time delay value (that is, each
The time delay of the main diameter of radio-frequency channel) obtain each radio-frequency channel and the delay inequality with reference to radio-frequency channel.Assuming that the master of launch channel i
The time delay value of diameter is τTx, i, it is transmission channel 0, time delay value τ with reference to radio-frequency channelTx, 0, then transmission channel i can be acquired
Delay inequality with transmission channel 0 is τ 'Tx, i=τTx, i-τTx, 0。
S204, according to first radio-frequency channel and the delay inequality with reference to radio-frequency channel and first radio frequency
The sampling time in channel is modified the initial calibration penalty coefficient of first radio-frequency channel, and it is logical to obtain first radio frequency
The first rectification building-out coefficient in road.
In some possible embodiments, it acquires any transmission channel (i.e. the first radio-frequency channel) and refers to radio frequency
It, then can be according to the sampling time of above-mentioned delay inequality and the first radio-frequency channel to the first radio-frequency channel after the delay inequality in channel
Initial calibration penalty coefficient be modified, obtain the first rectification building-out coefficient of the first radio-frequency channel.Specifically, can be by first
Radio-frequency channel (such as the initial calibration penalty coefficient β of transmission channel i)Tx, i(k, l) and designated indexCarry out multiplication
Operation obtains the first rectification building-out factor beta of the first radio-frequency channelTx, i(k, l) 1=, i.e. βTx, i(k, l) 1=βTx, i(k, l)Wherein, the τ ' in above-mentioned designated indexTx, iFor transmission channel i and with reference to the delay inequality of radio-frequency channel, Ts is transmitting
The sampling time of channel i.
Further, the bearing calibration of radio-frequency channel provided in an embodiment of the present invention can also be to the first phase of each radio-frequency channel
Compensate, by time domain time delay value and phse conversion to frequency domain on calibrate.Specifically, can be from each radio-frequency channel
Time domain channel response in extract the phase of each transmission channel, according to the phase of reference transmission channel, it is logical to obtain each radio frequency
Road and phase difference with reference to radio-frequency channel, and then according to each radio-frequency channel and with reference to the phase difference of radio-frequency channel and each
The time delay value of radio-frequency channel and sampling time are modified the initial calibration penalty coefficient of each radio-frequency channel, obtain each
First rectification building-out coefficient of radio-frequency channel.Specifically, can be from the main diameter intensity α of each radio-frequency channelTx, iejθtx,iIn extract
Phase information θTx, i, wherein αTx, iFor the amplitude of main diameter intensity.After the phase for obtaining each radio-frequency channel, then it can determine each
Radio-frequency channel (such as transmission channel i) and the phase difference θ with reference to radio-frequency channel 'Tx, i=θTx, i-θTx, 0, and then according to phase difference,
With each radio-frequency channel (time delay value of transmission channel i) and sampling time, to the initial calibration penalty coefficient of each radio-frequency channel
It is modified, obtains the first rectification building-out coefficient of each radio-frequency channel, such as βTx, i(k, l) 1=βTx, i(k, l)
S205, the BBU carry out the first rectification building-out coefficient according to the rectification building-out coefficient of reference radio-frequency channel
Alignment correction, obtains the second rectification building-out coefficient, according to the second rectification building-out coefficient to being mapped to the antenna element
Transmitting signal is calibrated.
In the specific implementation, above-mentioned the first rectification building-out coefficient to each radio-frequency channel carries out the specific implementation of alignment correction
Process can be found in the step S103 in the first embodiment of the bearing calibration of the radio-frequency channel of embodiments of the present invention offer,
This is repeated no more.
In embodiments of the present invention, BBU can obtain the channel estimation of each radio-frequency channel according to the correction signal received
Value, the initial calibration penalty coefficient of each radio-frequency channel is determined according to the channel estimation value of each radio-frequency channel, further according to each
Time delay value, sampling time of radio-frequency channel etc. are modified and are aligned school to the initial calibration penalty coefficient of each radio-frequency channel
Just, the rectification building-out coefficient after being corrected, and then the transmitting signal that antenna element can be mapped to each radio-frequency channel carries out
Calibration.Delay inequality in time domain can be also transformed on frequency domain by the embodiment of the present invention, and the correction of radio-frequency channel is carried out on frequency domain,
Phase can also be compensated, the correction of radio-frequency channel is carried out in conjunction with phase difference, realize the radio-frequency channel under FDD LTE system
Correction ensures the reciprocity of uplink and downlink channel.
It is the schematic structural diagram of the first embodiment of the means for correcting of radio-frequency channel provided in an embodiment of the present invention referring to Fig. 8.
The means for correcting of radio-frequency channel described in the embodiment of the present invention, comprising:
Determining module 10, the channel that the digital correction signal for being fed back according to antenna element obtains the first radio-frequency channel are estimated
Evaluation, and determine according to the channel estimation value initial calibration penalty coefficient of first radio-frequency channel.
Correction module 20, for true to the determining module according to the time delay value of first radio-frequency channel and sampling time
The initial calibration penalty coefficient of fixed first radio-frequency channel is modified, and obtains the first rectification building-out coefficient.
Calibration module 30 corrects the correction module for the rectification building-out coefficient according to reference radio-frequency channel
The first rectification building-out coefficient carries out alignment correction, obtains the second rectification building-out coefficient.
Above-mentioned calibration module 30 is also used to according to the second rectification building-out coefficient to the hair for being mapped to the antenna element
Signal is penetrated to be calibrated.
In the specific implementation, concretely the present invention is implemented the means for correcting of radio-frequency channel described in the embodiment of the present invention
The first embodiment of the bearing calibration for the radio-frequency channel that the embodiments of the present invention provide can be performed in the BBU that example provides, above-mentioned BBU
Described in implementation, the means for correcting of radio-frequency channel described in the embodiment of the present invention can pass through its determining module
10, correction module 20 and calibration module 30 execute implementation described in above-described embodiment, and for details, reference can be made to above-mentioned implementations
Example, details are not described herein.
It is the schematic structural diagram of the second embodiment of the means for correcting of radio-frequency channel provided in an embodiment of the present invention referring to Fig. 9.
The means for correcting of radio-frequency channel described in the embodiment of the present invention, comprising:
Determining module 40, the channel that the digital correction signal for being fed back according to antenna element obtains the first radio-frequency channel are estimated
Evaluation, and determine according to the channel estimation value initial calibration penalty coefficient of first radio-frequency channel.
Correction module 60, for true to the determining module according to the time delay value of first radio-frequency channel and sampling time
The initial calibration penalty coefficient of fixed first radio-frequency channel is modified, and obtains the first rectification building-out coefficient.
Calibration module 80 corrects the correction module for the rectification building-out coefficient according to reference radio-frequency channel
The first rectification building-out coefficient carries out alignment correction, obtains the second rectification building-out coefficient.
Above-mentioned calibration module 80 is also used to according to the second rectification building-out coefficient to the hair for being mapped to the antenna element
Signal is penetrated to be calibrated.
In the specific implementation, institute in above-described embodiment can be performed in above-mentioned determining module 40, correction module 60 and correction module 80
Implementation performed by the determining module 10 of description, correction module 20 and correction module 30 can also carry out other following operations:
In some possible embodiments, first radio-frequency channel is transmission channel；
The determining module 40, is specifically used for:
The digital correction signal that the antenna element is fed back is received from specified receiving channel, to antenna element feedback
Digital correction signal carries out Digital Signal Processing, obtains the channel estimation value of the transmission channel；
The inverse for taking the channel estimation value of the transmission channel obtains the initial calibration penalty coefficient of the transmission channel.
In some possible embodiments, first radio-frequency channel is receiving channel；
The determining module 40 is specifically used for:
The digital correction signal fed back by the receiving channel receiving antenna unit carries out the digital correction signal
Digital Signal Processing obtains the channel estimation value of the receiving channel；
The inverse for taking the channel estimation value of the receiving channel obtains the initial calibration penalty coefficient of the receiving channel.
In some possible embodiments, above-mentioned correction module 60 is specifically used for:
The initial calibration penalty coefficient of first radio-frequency channel and designated index are subjected to multiplying, to described the
The initial calibration penalty coefficient of one radio-frequency channel is modified, and obtains the first rectification building-out coefficient；
Wherein, the designated index isThe k is the mark of subcarrier, the τeFor first radio frequency
The time delay value in channel, the Ts are the sampling time, and the N is Fast Fourier Transform (FFT) FFT points.
In some possible embodiments, above-mentioned calibration module 80 is specifically used for:
The first rectification building-out coefficient of first radio-frequency channel is mended divided by the correction with reference to radio-frequency channel
Coefficient is repaid, the second rectification building-out coefficient of the first radio-frequency channel is obtained；
Wherein, it is described with reference to radio-frequency channel be from least one transmission channel for transmit signals to the antenna element with
One transmission channel of machine selection, or receive antenna element feedback correction signal at least one receiving channel in it is random
One receiving channel of selection.
In some possible embodiments, above-mentioned calibration module 80 is specifically used for:
The the second rectification building-out coefficient for determining each radio-frequency channel, according to the second rectification building-out of each radio-frequency channel
Coefficient calibrates the transmitting signal of each radio-frequency channel, obtains the purpose being mapped on antenna element transmitting letter
Number.
In some possible embodiments, above-mentioned calibration module 80 is specifically used for:
According to the second rectification building-out coefficient sets of each radio-frequency channel diagonally matrix, and according to each described
The frequency-region signal that radio-frequency channel emits on the subcarrier k, symbol l forms column matrix；
By column matrix described in the diagonal matrix premultiplication, the purpose transmitting letter being mapped on the antenna element is obtained
Number；
Wherein, the element on the leading diagonal of the diagonal matrix is the second rectification building-out system of each radio-frequency channel
Number.
In some possible embodiments, the means for correcting of radio-frequency channel provided in an embodiment of the present invention further include:
Module 50 is obtained, obtains each described penetrate for the time domain channel response according to the main diameter of each radio-frequency channel
The time delay value in frequency channel；
The acquisition module 50, is also used to the time delay value according to reference radio-frequency channel, obtain each radio-frequency channel with
The delay inequality with reference to radio-frequency channel；
The correction module 60 is also used to according to first radio-frequency channel and the delay inequality with reference to radio-frequency channel,
And the sampling time of first radio-frequency channel is modified the initial calibration penalty coefficient of first radio-frequency channel, obtains
To the first rectification building-out coefficient of first radio-frequency channel；
Wherein, it is most strong to transmit signals to transmitting signal in multiple paths of antenna element for the radio-frequency channel for the main diameter
Path, it is described with reference to radio-frequency channel be the radio-frequency channel in randomly selected any radio-frequency channel, with the radio-frequency channel
As reference channel.
Compensating module 70 is compensated for the first phase to each radio-frequency channel, by time domain time delay value and
It is calibrated in phse conversion to frequency domain.
Above-mentioned compensating module 70 is specifically used for:
The phase that each radio-frequency channel is extracted from the time domain channel response of each radio-frequency channel, according to described
With reference to the phase of radio-frequency channel, each radio-frequency channel and the phase difference with reference to radio-frequency channel are obtained；
The correction module, is also used to according to each radio-frequency channel and the phase difference with reference to radio-frequency channel, with
And time delay value and the sampling time of each radio-frequency channel, the initial calibration penalty coefficient of each radio-frequency channel is carried out
Amendment, obtains the first rectification building-out coefficient of each radio-frequency channel.
In the specific implementation, the means for correcting of radio-frequency channel described in the embodiment of the present invention can be performed in the embodiment of the present invention
Implementation described in the first embodiment and second embodiment of the bearing calibration of described radio-frequency channel, can specifically join
See above-described embodiment, details are not described herein.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the program can be stored in computer-readable storage medium
In, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, therefore equivalent changes made in accordance with the claims of the present invention, is still within the scope of the present invention.
Claims (22)
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| CN201410632335.5A CN105656815B (en) | 2014-11-11 | 2014-11-11 | Method and device for calibrating radio frequency channel |
| PCT/CN2015/093869 WO2016074585A1 (en) | 2014-11-11 | 2015-11-05 | Radio-frequency channel correction method and device |
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| WO2017219265A1 (en) * | 2016-06-22 | 2017-12-28 | 华为技术有限公司 | Channel correction method and device |
| WO2018018466A1 (en) * | 2016-07-27 | 2018-02-01 | 华为技术有限公司 | Active antenna system, base station and communication system |
| CN106209705B (en) * | 2016-09-07 | 2019-06-14 | 江苏中兴微通信息科技有限公司 | A kind of main diameter estimation method and device of millimeter wave condition of sparse channel |
| WO2018098815A1 (en) * | 2016-12-02 | 2018-06-07 | 华为技术有限公司 | Phase correction method and device |
| CN106788801A (en) * | 2016-12-16 | 2017-05-31 | 四川九洲电器集团有限责任公司 | A kind of signal calibration method and electronic equipment |
| CN107395533B (en) * | 2017-06-20 | 2020-06-16 | 上海华为技术有限公司 | Channel correction method and correction device |
| CN107911178B (en) * | 2017-11-14 | 2020-01-14 | 京信通信系统（中国）有限公司 | Channel calibration method and device |
| CN110299950B (en) * | 2018-03-22 | 2022-05-06 | 中兴通讯股份有限公司 | A radio frequency channel calibration method and device |
| CN108540241B (en) * | 2018-03-30 | 2020-06-02 | 华中科技大学 | Channel reciprocity correction method of multi-antenna wireless communication system |
| CN110333478B (en) * | 2018-03-30 | 2022-05-17 | 华为技术有限公司 | A kind of arrival angle, departure angle determination method and communication device |
| CN110661736B (en) * | 2018-06-30 | 2021-01-05 | 上海华为技术有限公司 | Signal processing method and related device |
| CN111130582B (en) * | 2018-11-01 | 2022-02-25 | 华为技术有限公司 | Method for calculating emission weight in coherent joint emission JT and corresponding device |
| CN111147222B (en) * | 2019-12-23 | 2022-07-12 | 中国人民解放军战略支援部队信息工程大学 | Reciprocal random source extraction method and device for time division duplex system |
| CN113949468B (en) * | 2020-07-17 | 2022-12-30 | 华为技术有限公司 | Initial phase correction method for transmission channel, base station and computer storage medium |
| CN113328763B (en) * | 2021-06-03 | 2022-10-25 | 联想(北京)有限公司 | Carrier power control method and device and radio remote unit |
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| CN102195695A (en) * | 2010-03-02 | 2011-09-21 | 电信科学技术研究院 | Antenna calibration method and device |
| CN102404033A (en) * | 2011-11-24 | 2012-04-04 | 北京交通大学 | An antenna array calibration method and device in an OFDM system |
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| CN102195695A (en) * | 2010-03-02 | 2011-09-21 | 电信科学技术研究院 | Antenna calibration method and device |
| CN102404033A (en) * | 2011-11-24 | 2012-04-04 | 北京交通大学 | An antenna array calibration method and device in an OFDM system |
| CN102624470A (en) * | 2012-02-27 | 2012-08-01 | 清华大学 | Real-time calibration method and real-time calibration device for multi-channel transmitter radio frequency response |
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