CN1956349A - Radio signal receiving system, method and duplexer - Google Patents

Abstract

The invention discloses a wireless signal receiving system, method and duplexer, the system includes an antenna, at least two radio frequency units, the radio frequency unit includes a duplexer and a transceiver, and the duplexer of the radio frequency unit is used for The signal received by the antenna is copied, and the copied signal is sent to the transceivers of the at least two radio frequency units. The wireless signal receiving system, method and duplexer of the present invention use the channel crossover technology to replicate and crossover process the received signal, so that although each duplexer receives with a single antenna, it achieves the effect of multi-antenna reception.

Description

Wireless signal receiving system, method and duplexer

technical field

The invention relates to the communication field, in particular to a wireless signal receiving system, method and duplexer.

Background technique

In mobile communication, the communication between the base station and the mobile station is not only through the direct path, but also through many other paths. Because the direct path is blocked by buildings or other objects, the existence of a large number of propagation paths produces the so-called multipath phenomenon, and the amplitude and phase of the synthesized wave fluctuate greatly with the movement of the mobile station.

In order to reduce the impact of multipath on the communication between the base station and the mobile station, in the actual mobile communication network, diversity reception is usually used to resist fading. The basic idea of diversity reception is to divide the received signal into multiple independent uncorrelated signals, and then combine these signals with different energies according to different rules. The dual-antenna uses the idea of diversity reception to obtain gain from diversity. Compared with single-antenna reception, the sensitivity can be increased by about 3db, and it is resistant to fast fading. For base stations, the use of dual-antenna technology can improve network performance and increase uplink capacity. , therefore, dual-antennas are commonly used to receive signals in actual networks.

Dual-antenna is the automatic coordination of two antennas, also known as antenna diversity. Usually, one antenna only receives, and the other receives and transmits.

There are two main implementation schemes for existing base station dual-antenna reception:

Implementation scheme 1 of existing base station dual-antenna reception:

In order to realize the receive diversity of 1 sector ^* 2 carriers, since each sector includes at least 2 carriers, one base station carries two carriers at the same time.

FIG. 1 is a schematic structural diagram of an existing dual-antenna diversity receiving scheme 1, as shown in FIG. 1 ,

The base station includes a baseband processor, a radio frequency unit and two antennas.

Among them, the baseband processor is used to process the received data signal and the data signal received from the base station controller, which needs to be sent to the radio frequency unit, such as modulation and demodulation, encoding and decoding, and the modulation method has Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing , OFDM), coded Orthogonal Frequency Division Multiplexing (Coded Orthogonal Frequency Division Multiplexing, COFDM), quadrature phase shift keying (Quadrature phase Shift keying, QPSK), quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM), etc., the coding methods are Variable encoding, adaptive encoding, etc.

The radio frequency unit includes a duplexer and a transceiver, where,

The duplexer is used for data filtering and low-noise amplification;

The transceiver is used to receive the signal sent by the duplexer, and after the signal is processed by filtering, digital frequency conversion, analog signal frequency conversion, etc., it is sent to the baseband processor and receives the signal sent by the baseband processor, and the signal is frequency converted After being processed, it is sent to the duplexer.

The ports of duplexers and transceivers are usually directly connected by RF signal lines.

The antenna is used to receive and send wireless signals, and the antenna is connected to the duplexer through a feeder.

In order to achieve dual-antenna reception, the duplexer of the radio frequency unit needs to be connected to two single-polarized antennas or one dual-polarized antenna.

The single-polarization antenna is a traditional antenna, including two basic single-polarization situations: vertical polarization and horizontal polarization. Dual-polarized antenna is a new type of antenna technology, which combines +45° and -45° two antennas with orthogonal polarization directions and works in the duplex mode of sending and receiving at the same time, so its most prominent advantage is to save a single orientation The number of antennas in the base station.

Both duplexers and transceivers support multi-carrier, and each module includes one transmit channel and two receive channels. Dual antennas realize diversity reception, one transmit channel and one receive channel share one channel, which is called the main set channel, and the other receive channel independently occupies a channel, called the diversity channel.

One end of the main collection channel of the duplexer is connected to the main collection channel of the transceiver, and the other end is connected to the antenna; one end of the diversity channel of the duplexer is connected to the diversity channel of the transceiver, and the other end is connected to the antenna.

One end of the main collection channel of the transceiver is connected to the main collection channel of the duplexer, and the other end is connected to the baseband processor; one end of the diversity channel of the transceiver is connected to the diversity channel of the duplexer, and the other end is connected to the baseband processor.

The baseband processor sends the downlink signal to the radio frequency unit first, and then transmits it through the antenna after being processed by the radio frequency unit. The specific process is as follows:

The baseband processor sends the downlink signal to the main transmission channel of the transceiver first, and the transceiver first filters the signal, converts the frequency, converts the digital to analog, amplifies the analog signal, converts the frequency of the analog signal, and then amplifies the signal through the power amplifier , is transmitted from the main set transmission channel of the transceiver to the main set transmission channel of the duplexer, and the duplexer filters the received signal and sends it to the antenna through the main set transmission channel. Two carriers share a duplexer and a main channel.

The uplink signal received from the antenna is first sent to the radio frequency unit, processed by the radio frequency unit and then sent to the baseband processor. The specific process is as follows:

The uplink signal received from the antenna is divided into two channels, one of which is transmitted to the duplexer through the main receiving channel of the duplexer, and the duplexer filters and amplifies the received signal through the main receiving channel It is transmitted to the main receiving channel of the transceiver, and the transceiver performs signal amplification, frequency conversion, analog-to-digital conversion, filtering and other processing on the received signal, and then the signal is transmitted to the baseband processor through the main receiving channel of the transceiver; the other signal It is transmitted to the duplexer through the diversity receiving channel of the duplexer. The duplexer filters and amplifies the received signal through the diversity receiving channel and then transmits it to the diversity receiving channel of the transceiver. The transceiver amplifies the signal. , frequency conversion, analog-to-digital conversion, filtering, and other processing, it is transmitted to the baseband processor through the diversity receiving channel of the transceiver. The two carriers share a duplexer and a main set channel.

Disadvantages of this program:

In this scheme, since the two carriers share one transceiver, and one transceiver only includes one power amplifier, for the downlink signal, the two carriers share one transmit channel and one power amplifier, which makes each The downlink power output of the carrier is halved, reducing the downlink signal coverage.

The second scheme of the existing base station dual-antenna reception:

FIG. 2 is a schematic structural diagram of the second existing dual-antenna diversity receiving scheme. As shown in FIG. 2 , the base station includes two baseband processors, two radio frequency units and four antennas. That is to say, the equipment in the two sets of scheme one is used.

Each set of equipment includes a baseband processor, a radio frequency unit and two antennas, each carrying a carrier, and each carrier uses a transmission channel and a power amplifier. An antenna is connected to the main channel and the diversity channel of each duplexer.

The signal flow direction of each carrier is also the same as the signal flow direction in Solution 1.

Although this solution solves the problem that the two carriers share a transmission channel and a power amplifier in solution 1, so that the downlink power output of each carrier is halved, however, an additional antenna and a feeder are installed for each carrier , which increases the cost and construction difficulty, and takes up too much space. In actual engineering installation, the antenna and feeder are generally installed on the iron tower, and the iron tower is expensive, the space is relatively tight, and it is often connected with multiple equipment such as microwave Shared, too many antennas and feeders cannot be installed. Therefore, a single antenna is usually used without diversity to achieve carrier reception.

Existing single-antenna non-diversity implementations for carrier reception:

Fig. 3 is the structural diagram of the existing single antenna non-diversity realization carrier receiving realization scheme, as shown in Fig. 3, the base station includes two baseband processors, two radio frequency units and two antennas, and the existing base station dual-antenna reception Compared with the second scheme, two antennas are reduced, and the transmission channel and the reception channel are not divided into the main channel and the diversity channel, but share a main channel, and the main channel of each duplexer is connected to an antenna . The flow direction of the main set signal is the same as the flow direction of the main set signal in the scheme 2 of the existing dual-antenna reception of the base station.

Disadvantages of this program:

Due to the use of a single single-polarized antenna, there is only one receiving channel for uplink signals, which reduces uplink sensitivity, and also reduces uplink coverage and capacity.

Contents of the invention

An object of the present invention is to provide a wireless signal receiving system, so that each duplexer uses a single antenna to receive and achieve the effect of multiple antennas.

The wireless signal receiving system of the present invention includes an antenna, at least two radio frequency units, the radio frequency unit includes a duplexer and a transceiver, and the duplexer of the radio frequency unit is used to replicate the signal received by the antenna, and The copied signal is sent to the transceivers of the at least two radio frequency units.

The duplexer includes an amplification module and a signal duplication module, wherein:

The amplification module is used to amplify the signal received by the antenna, and send the amplified signal to the signal replication module;

The signal duplication module is configured to duplicate the received signal and send it to the transceivers of the at least two radio frequency units.

The duplexer also includes a filter module for filtering the signal and sending it to the amplification module.

The at least two radio frequency units belong to the same base station or belong to different base stations.

Another object of the present invention is to provide a wireless signal receiving method.

The wireless signal receiving method of the present invention is applied to a signal receiving system comprising an antenna and at least two radio frequency units, the radio frequency unit comprising a duplexer and a transceiver, comprising the following steps:

A) The antenna receives the signal, and sends the received signal to the duplexer of the radio frequency unit;

B) the duplexer of the radio frequency unit replicates the signal received by the antenna;

C) The duplexer of the radio frequency unit sends the copied signal to the transceivers of the at least two radio frequency units.

Described step C) comprises the following steps afterwards:

Step D) the transceivers of the at least two radio frequency units process the received signals and send them to the baseband processing unit;

Step E) The baseband processing unit processes the received signal and sends it to the base station controller, which sends it to the mobile switching center, and accesses the mobile communication core network under the control of the mobile switching center.

In the step B), the duplexer of the radio frequency unit filters and amplifies the signal received by the antenna, and then replicates it.

The different radio frequency units belong to the same base station or different base stations.

Another object of the present invention is to provide a duplexer.

The duplexer of the present invention includes an amplifying module for amplifying the signal received by the antenna, and the duplexer also includes a signal duplication module for duplicating the received signal and sending it to the outside.

The beneficial effects of the present invention are: by duplicating the output signal of the duplexer and crossing channels, each duplexer uses a single antenna to receive the multi-antenna effect, thereby reducing the number of antennas and improving the uplink signal The coverage area improves the capacity of the cell.

Description of drawings

FIG. 1 is a schematic structural diagram of an existing dual-antenna diversity receiving scheme 1;

FIG. 2 is a schematic structural diagram of a second existing dual-antenna diversity receiving scheme;

FIG. 3 is a schematic structural diagram of an existing single-antenna non-diversity realization scheme for carrier reception;

Fig. 4 is a system structural diagram of the wireless signal receiving system of the present invention;

FIG. 5 is a system structural diagram of a wireless signal receiving system according to Embodiment 1 of the present invention;

Fig. 6 is the structural diagram of the duplexer of the present invention;

Fig. 7 is a flow chart of the antenna receiving method of the present invention;

FIG. 8 is a system structure diagram of a wireless signal receiving system according to Embodiment 2 of the present invention.

Detailed ways

The basic idea of the present invention is to realize multi-antenna diversity reception with a single antenna by using channel crossover technology.

The present invention will be further described in detail below in conjunction with accompanying drawings 4 to 8 and specific embodiments.

Embodiment one

Fig. 4 is a system structural diagram of the wireless signal receiving system of the present invention. As shown in Fig. 4, the wireless signal receiving system of the present invention includes at least two radio frequency units and antennas, and the radio frequency unit includes a duplexer and a transceiver, The duplexer of the radio frequency unit is used to duplicate the signal received by the antenna, and send the duplicated signal to the transceivers of the at least two radio frequency units.

The duplexer includes an amplification module and a signal duplication module, wherein:

The amplification module is used to amplify the signal received by the antenna, and send the amplified signal to the signal replication module;

The signal duplication module is configured to duplicate the received signal and send it to the transceivers of the at least two radio frequency units.

The duplexer also includes a filter module for filtering the signal and sending it to the amplification module.

There may be two radio frequency units, or more than two radio frequency units. If there are four radio frequency units, the four radio frequency units share two dual-polarized antennas, and so on if there are more than four radio frequency units.

FIG. 5 is a system structure diagram of a wireless signal receiving system according to Embodiment 1 of the present invention. The wireless signal receiving system according to Embodiment 1 of the present invention is described by taking two radio frequency units as an example. As shown in Figure 5, the wireless signal receiving system according to Embodiment 1 of the present invention includes two radio frequency units and two antennas, each radio frequency unit includes a duplexer and a transceiver, wherein the duplexer includes an amplifier module, which is different from the existing wireless signal receiving system in that the duplexer also includes a signal duplication module, which is used to receive the signal output by the amplifying module, and duplicate the signal into two identical signals, and the duplexer The duplexer sends the at least two signals to the transceiver of the radio frequency unit to which the duplexer belongs and the transceivers of other radio frequency units respectively.

This embodiment is described by taking two radio frequency units as an example, and there may be more than two radio frequency units. If there are four carriers, four radio frequency units are required to implement 1 sector * 4 carrier configurations. When there are multiple carriers, multiple radio frequency units are required to implement multiple carrier configurations.

The radio frequency unit is a radio frequency unit inside the same base station.

Each duplexer and transceiver includes a transmission channel TX and two reception channels RXA, RXB, where the transmission channel TX and a reception channel RXA share a channel, called the main set channel, and the other reception channel RXB is independently occupied One channel is called a diversity channel.

The duplexer includes at least two output ends, one is connected to the input end of the main set channel of the transceiver of the radio frequency unit, and the other is connected to the input end of the main set channel of the transceiver of other radio frequency units.

The duplexer is an active module, and the two RF signals copied by the signal duplication module are amplified signal duplications, and the attenuation caused has no effect on the signals. At the same time, due to the duplication of the input signal, the main channel and the diversity channel of each transceiver have input signals, and the effect of dual-antenna reception is realized with a single antenna.

The transceiver is composed of a power amplifier, a transmitting channel and a receiving channel, which are used to receive the signal sent by the duplexer, send the signal to the baseband processor and receive the signal sent by the baseband processor, and send the signal to the duplexer tool.

The specific connection relationship is as follows:

The input end of the main set channel RXA/TX (RX means receiving, TX means sending) of each duplexer is connected to the antenna, and the output end is divided into two output ends RXA0 and RXA1 through the signal replication module, of which one output end RXA0 It is connected to the input end of the main collection channel RXA/TX of the transceiver of this radio frequency unit, and the other output end RXA1 is connected to the input end of the diversity channel RXB of other radio frequency units; the output end of the main collection channel RXA/TX of the transceiver and The output end of the diversity channel RXB is connected with the baseband processor.

Each radio frequency unit can carry one carrier or more carriers.

The antenna may be a single polarized antenna or a dual polarized antenna. The antenna and the radio frequency unit are connected through a feeder.

The uplink and downlink signal flow of each carrier is as follows:

The downlink signal of the carrier wave sent from the baseband processor is first sent to the transmission channel TX of the transceiver, and the transceiver performs filtering, frequency conversion, digital-to-analog conversion, analog signal amplification, and analog signal frequency conversion on the received signal, and then After the signal is amplified by the power amplifier, it is transmitted to the transmission channel TX of the duplexer through the transmission channel TX of the transceiver. The duplexer filters the received signal and sends it to the antenna through the main transmission channel TX, and transmits the signal through the antenna . The downlink signal does not need to pass through the signal duplication module.

The uplink signal of the carrier received from the antenna is first sent to the filter module of the duplexer of the radio frequency unit carrying the carrier. After the filter module filters the out-of-band noise on the signal, it is sent to the amplification module of the duplexer. The amplification module amplifies the signal After sending to the signal duplication module of the duplexer, the signal duplication module duplicates the signal into two signals, wherein, one signal is sent to the receiving channel RXA of the transceiver carrying the carrier radio frequency unit through the output terminal RXA0 of the main set receiving channel At the input end, the other signal is sent to the input end of the receiving channel RXB of the transceiver of the radio frequency unit carrying another carrier through the output end RXA1 of the main set receiving channel; the transceiver performs amplification, frequency conversion, analog-to-digital conversion, and filtering on the uplink signal After processing, it is sent to the baseband processor.

FIG. 6 is a structural diagram of the duplexer of the present invention. As shown in Fig. 6, the duplexer of the present invention includes a filtering module and an amplifying module. The difference from the existing duplexer is that the duplexer also includes a signal duplication module for sending When the uplink signal is received, the signal output by the amplification module is received, and the signal is copied and sent to the outside.

The signal flow direction of the duplexer will be described below by taking the duplicated signals as two channels, and the duplicated signals are respectively output to the transceiver 1 and the transceiver 2 as an example.

After the duplexer receives the signal sent by the antenna, it first sends it to the filter module, which can be a cavity filter or a dielectric filter. After the filter module filters out-of-band noise from the signal, it sends it to the amplification module. After the signal is amplified to an appropriate level by the amplifying module, the amplifying module amplifies the signal and sends it to the signal duplication module. The signal duplication module duplicates the signal into two signals, each signal is the same as the original signal, and then outputs the two signals to different transceivers respectively. However, when the duplexer receives the downlink signal sent by the transceiver 2, it does not pass through the signal duplication module.

The antenna receiving method of the present invention is applied to a signal receiving system including an antenna and at least two radio frequency units, and the radio frequency unit includes a duplexer and a transceiver. Fig. 7 is a flowchart of the antenna receiving method of the present invention, as shown in Fig. 7 As shown, the antenna receiving method of the present invention specifically includes the following steps:

101) An antenna receives a signal, and sends the received signal to a duplexer of the radio frequency unit.

102) The duplexer of the radio frequency unit replicates the signal received by the antenna.

Each signal after duplication is the same as the original signal.

The duplexer of the radio frequency unit filters and amplifies the signal received by the antenna, and then replicates it.

103) The duplexer of the radio frequency unit sends the copied signal to the transceivers of the at least two radio frequency units.

After the duplexer copies the received signal, one of the copied signals is sent to the transceiver of the radio frequency unit to which the duplexer belongs, and the other signals after copying are sent to the radio frequency unit of the other duplexer. transceiver. Since the input signal is copied, the main collection channel and the diversity channel of each transceiver have input signals, and the effect of multi-antenna reception is realized with a single antenna. Therefore, the number of antennas, feeders, jumpers, and connectors is reduced, the cost and workload are reduced, and the uplink sensitivity, uplink coverage and capacity are improved.

The subsequent processing of step 103) is the same as in the prior art: the transceiver amplifies the received signal, converts the frequency, converts analog to digital, filters, etc., and then sends it to the baseband processing unit; the baseband processor receives the uplink signal sent by the transceiver. After receiving the signal, the signal is processed by modulation and demodulation, coding and decoding, etc., and then sent to the base station controller, which then sends it to the mobile switching center for processing. Access to the mobile communication core network under the control of the mobile switching center.

Embodiment two

FIG. 8 is a system structure diagram of a wireless signal receiving system according to Embodiment 2 of the present invention. As shown in FIG. 8 , the wireless signal receiving system according to Embodiment 2 of the present invention includes an antenna and at least two base stations, and each base station includes a radio frequency unit. Wherein, the radio frequency unit includes a duplexer and a transceiver. The duplexer also includes a signal duplication module, which is used to duplicate the uplink signal received by the duplexer.

The difference between the wireless signal receiving system in Embodiment 2 of the present invention and the wireless signal receiving system in Embodiment 1 of the present invention is that the radio frequency units are radio frequency units in the same sector of different carrier frequencies of different base stations.

The following two base stations are used as an example to illustrate the signal flow: after the duplexers of the two base stations amplify and copy the uplink signal, they are divided into two signals, one signal is used as the input of the transceiver of the base station, and the other The signal is then used as the input of another base station's transceiver to receive the signal. When the capacity of a base station cannot meet the requirements of the area, use the channel crossover technology to interconnect the radio frequency parts of the same sector of the two base stations with different carrier frequencies using the wireless signal receiving system of Embodiment 2 of the present invention to realize two The same sector of a base station uses the same antenna to realize the coverage of multiple carriers in the same sector.

The two base stations may share a pair of dual-polarized antennas, or each use a pair of single-polarized antennas.

The difference between the antenna receiving method of Embodiment 2 of the present invention and the antenna receiving method of Embodiment 1 of the present invention is that 103) is changed to the following steps:

103) The duplexer of the radio frequency unit sends the copied signal to the transceivers of the radio frequency units of different base stations.

The duplexer copies the received signal into two signals, wherein one signal is sent to the transceiver of the base station to which the duplexer belongs, and the other signal is sent to the transceivers of the base stations to which the other duplexer belongs. Since the input signal is duplicated, the main channel and the diversity channel of each transceiver have input signals, and the effect of using the same dual-polarized antenna in the same sector of the two base stations is realized.

When the capacity of a base station cannot meet the requirements of this area, the radio frequency parts of the same sector with different carrier frequencies of the two base stations are interconnected by the method of the present invention by using channel crossover technology, and the same sector of the two base stations is realized. Using the same dual-polarized antenna achieves the same coverage and receiving performance as when a single base station uses a single dual-polarized antenna, while doubling the capacity and realizing the coverage of multiple carriers in the same sector.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

Claims (9)

1. A wireless signal receiving system, comprising an antenna, at least two radio frequency units, said radio frequency unit comprising a duplexer and a transceiver, characterized in that the duplexer of said radio frequency unit is used to transmit signals received by the antenna copying, and sending the copied signal to the transceivers of the at least two radio frequency units. 2. The wireless signal receiving system according to claim 1, wherein the duplexer includes an amplification module and a signal duplication module, wherein: The amplification module is used to amplify the signal received by the antenna, and send the amplified signal to the signal replication module; The signal duplication module is configured to duplicate the received signal and send it to the transceivers of the at least two radio frequency units. 3. The wireless signal receiving system according to claim 2, wherein the duplexer further comprises a filter module for filtering the signal and sending it to the amplification module. 4. The wireless signal receiving system according to any one of claims 1 to 3, wherein the at least two radio frequency units belong to the same base station or belong to different base stations. 5. A wireless signal receiving method, applied to a signal receiving system comprising an antenna and at least two radio frequency units, said radio frequency unit comprising a duplexer and a transceiver, characterized in that, comprising the following steps: A) The antenna receives the signal, and sends the received signal to the duplexer of the radio frequency unit; B) the duplexer of the radio frequency unit replicates the signal received by the antenna; C) The duplexer of the radio frequency unit sends the copied signal to the transceivers of the at least two radio frequency units. 6. The wireless signal receiving method according to claim 5, characterized in that, said step C) comprises the following steps after: Step D) the transceivers of the at least two radio frequency units process the received signals and send them to the baseband processing unit; Step E) The baseband processing unit processes the received signal and sends it to the base station controller, which sends it to the mobile switching center, and accesses the mobile communication core network under the control of the mobile switching center. 7. The wireless signal receiving method according to claim 5, characterized in that, in the step B), the duplexer of the radio frequency unit filters and amplifies the signal received by the antenna, and then replicates it. 8. The wireless signal receiving method according to any one of claims 5 to 7, wherein the different radio frequency units belong to the same base station or different base stations. 9. A duplexer, comprising an amplifying module for amplifying the signal received by the antenna, characterized in that the duplexer also includes a signal duplication module, for duplicating the received signal and sending it to external.

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