WO2015100665A1

WO2015100665A1 - Method for reducing interferences, baseband processing unit and base station

Info

Publication number: WO2015100665A1
Application number: PCT/CN2013/091217
Authority: WO
Inventors: 徐向宁; 吴剑锋
Original assignee: 华为技术有限公司
Priority date: 2013-12-31
Filing date: 2013-12-31
Publication date: 2015-07-09
Also published as: CN104956595B; CN104956595A

Abstract

Disclosed is a method for reducing interferences, comprising: receiving, by a baseband processing unit, a first received signal from a first receiving channel, the first received signal containing the stray of a first transmission channel on the first receiving channel, wherein the first receiving channel shares a first antenna with the first transmission channel; receiving, by the baseband processing unit, a first coupled signal from a second receiving channel, the first coupled signal containing the stray which is coupled by a first coupler from an output of a power amplifier of the first transmission channel; and combining, by the baseband processing unit, the first received signal and the first coupled signal, and filtering the stray in the first received signal. Also disclosed are a baseband processing unit and a base station. By means of the present invention, the operation cost of a small base station can be reduced and stray interferences can be reduced when a low-performance filter is used.

Description

Method for reducing interference, baseband processing unit and ^

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method for reducing interference, a baseband processing unit, and a base station. Background technique

The output power of the existing small base station is generally 5 to 10 watts, which is much lower than that of the macro station. Therefore, the transmission and isolation isolation between the transmission channel and the reception channel of the small base station is lower than that of the macro station. For cost-saving reasons, operators hope to use low-performance filters for filtering in small base stations, but in practice, low-performance filters are not widely used in small base stations. An important factor that restricts the use of low-performance filters in small base stations is the transmission and reception isolation of Frequency Division Duplexing (FDD) systems. Currently, the transceiver isolation requirements of small base stations generally require 80-100 dB, while the commonly used low-performance filters The device can only support 50-60dB transceiver isolation. When the transmission channel of the small base station adopts a low performance filter, the low performance filter cannot effectively filter the spurious interference of the transmission channel on the receiving channel, which will affect the signal reception and is not conducive to the normal operation of the communication service. Summary of the invention

Embodiments of the present invention provide a method for reducing interference, a baseband processing unit, and a base station, to solve the problem that spurious interference affects signal reception when a small base station adopts a low performance filter.

A first aspect of the embodiments of the present invention provides a method for reducing interference, which may include:

The baseband processing unit receives a first received signal from the first receiving channel, the first received signal includes a spur of the first transmitting channel on the first receiving channel, wherein the first receiving channel and the The first transmitting channel shares the first antenna;

The baseband processing unit receives a first coupled signal from a second receive channel, the first coupled signal including a spur coupled by a first coupler from a power amplifier output of the first transmit channel; the baseband processing The unit combines the first received signal and the first coupled signal to filter out spurs in the first received signal.

In a first possible implementation manner of the first aspect, the baseband processing unit combines the first received signal and the first coupled signal to filter out spurious in the first received signal, including: The baseband processing unit demodulates the first received signal and the first coupled signal, and adjusts the The spurs in the first coupled signal are such that the spurs in the first coupled signal and the spurs in the first received signal have the same delay and amplitude, and the phases are opposite;

The baseband processing unit superimposes the demodulated first received signal and the demodulated and adjusted first coupled signal to filter out spurs in the first received signal.

In conjunction with the first aspect or in combination with the first possible implementation of the first aspect, in a second possible implementation manner, the method further includes:

The baseband processing unit receives a second received signal from the third receiving channel, and the second received signal includes a spur of the second transmitting channel on the third receiving channel, where the third receiving channel is The second transmitting channel shares a second antenna;

The baseband processing unit receives a second coupled signal from a fourth receive channel, the second coupled signal including a spur coupled by a second coupler from a power amplifier output of the second transmit channel; the baseband processing The unit combines the second received signal and the second coupled signal to filter out spurs in the second received signal;

The baseband processing unit combines the filtered first received signal and the filtered second received signal to obtain a third received signal.

In conjunction with the first aspect or in combination with the first or second possible implementation of the first aspect, in a third possible implementation, the baseband processing unit converts the first received signal and the first coupled signal The merger includes:

The baseband processing unit combines the first received signal and the first coupled signal in a manner of interference suppression combining; or

The baseband processing unit combines the first received signal and the first coupled signal in a manner that the maximum ratio is combined.

A second aspect of the embodiments of the present invention provides a method for reducing interference, which may include:

The baseband processing unit receives a first coupled signal from a second receive channel, the first coupled signal including a spur coupled by a first coupler from a power amplifier output of the first transmit channel; the baseband processing Receiving, by the unit, a second received signal from the third receiving channel, where the second received signal includes a spur of the second transmitting channel on the third receiving channel, where the third receiving The channel shares the second antenna with the second transmitting channel;

The baseband processing unit receives a second coupled signal from a fourth receive channel, the second coupled signal including a spur coupled by a second coupler from a power amplifier output of the second transmit channel; the baseband processing The unit combines the first received signal, the first coupled signal, the second received signal, and the second coupled signal to obtain a third received signal.

In a first possible implementation manner of the second aspect, the baseband processing unit combines the first received signal, the first coupled signal, the second received signal, and the second coupled signal to obtain a first The three received signals include:

The baseband processing unit combines the first received signal, the first coupled signal, the second received signal, and the second coupled signal in a manner of combining interference suppression; or

The baseband processing unit combines the first received signal, the first coupled signal, the second received signal, and the second coupled signal in a manner that the maximum ratio is combined.

A third aspect of the embodiments of the present invention provides a baseband processing unit, which may include:

a receiving unit, configured to receive a first received signal from the first receiving channel, where the first received signal includes a spur of the first transmitting channel on the first receiving channel, where the first receiving channel is The first transmit channel shares a first antenna; and receives a first coupled signal from a second receive channel, the first coupled signal including a first coupler coupled from a power amplifier output of the first transmit channel Stray

And a merging unit, configured to combine the first received signal and the first coupled signal to filter out spurs in the first received signal.

In a first possible implementation manner of the third aspect, the merging unit is specifically configured to: demodulate the first received signal and the first coupled signal, and adjust a spur of the first coupled signal, so that The spurious in the first coupled signal and the spurious delay and amplitude in the first received signal are the same, and the phases are opposite; the demodulated first received signal and the demodulated and adjusted first coupling Signal superposition, filtering out spurious in the first received signal.

In conjunction with the third aspect or in conjunction with the first possible implementation of the third aspect, in a second possible implementation, the receiving unit is further configured to:

Receiving a second received signal from the third receiving channel, the second received signal including a spur of the second transmitting channel on the third receiving channel, wherein the third receiving channel and the second transmitting Channel sharing a second antenna; and receiving a second coupling signal from the fourth receiving channel, the second The coupled signal includes a spur coupled by the second coupler from a power amplifier output of the second transmit channel;

The merging unit is further configured to combine the second received signal and the second coupled signal to filter out spurious in the second received signal; and filter out the spurious first received signal and filter The second received signal after the spurs is combined to obtain a third received signal.

With reference to the third aspect or the first or second possible implementation manner of the third aspect, in a third possible implementation, the merging unit is specifically configured to use the first received signal and the first The coupled signals are combined in a manner of interference suppression combining; or the first received signal and the first coupled signal are combined in a manner that the maximum ratio is combined.

A fourth aspect of the embodiments of the present invention provides a baseband processing unit, which may include:

a receiving unit, configured to receive a first received signal from the first receiving channel, where the first received signal includes a spur of the first transmitting channel on the first receiving channel, where the first receiving channel is The first transmitting channel shares a first antenna; receiving a first coupling signal from a second receiving channel, where the first coupling signal includes a first coupler coupled from a power amplifier output end of the first transmitting channel Receiving a second received signal from the third receiving channel, where the second received signal includes a spur of the second transmitting channel on the third receiving channel, wherein the third receiving channel and the first The second transmitting channel shares the second antenna; and receives the second coupled signal from the fourth receiving channel, the second coupled signal including a spur coupled by the second coupler from the power amplifier output of the second transmitting channel;

And a merging unit, configured to combine the first received signal, the first coupled signal, the second received signal, and the second coupled signal to obtain a third received signal.

In a first possible implementation manner of the fourth aspect, the merging unit is specifically configured to: according to the first received signal, the first coupled signal, the second received signal, and the second coupled signal Merging is performed in a manner of interference suppression combining; or combining the first received signal, the first coupled signal, the second received signal, and the second coupled signal in a maximum ratio combining manner.

A fifth aspect of the embodiments of the present invention provides a computer program product, which may include a computer readable medium, the computer readable medium comprising a set of program code for performing the first aspect, the first aspect of the embodiment of the present invention. An implementation, the second aspect, or the method of any one of the second aspects.

A sixth aspect of the embodiments of the present invention provides a base station, which may include:

At least one antenna; a transmitter, configured to perform a transmission channel processing on a signal output by the baseband processing unit; and a power amplifier for amplifying the output of the signal output by the transmitter;

a transmitting filter, configured to filter the signal output by the power amplifier and transmit the signal to the external space via the antenna;

a receiving filter, configured to filter and process the signal received by the antenna;

a receiver, configured to receive a signal output by the receiving filter, and perform a receiving channel processing on the signal output by the receiving filter to obtain a received signal, where the received signal includes the transmitting channel at the receiving Spurious on the channel;

a coupler for coupling a spur of the output of the power amplifier to the receiver, such that the receiver outputs the spurious coupling signal including the output of the power amplifier to the receiving channel;

The baseband processing unit is configured to receive a received signal and a coupled signal output by the receiver, combine the received signal and the coupled signal, and filter out spurs in the received signal.

In a first possible implementation manner of the sixth aspect, the baseband processing unit is the third aspect of the present invention, any implementation manner of the third aspect, the fourth aspect, or any implementation manner of the fourth aspect. Baseband processing unit.

Embodiments of the present invention have the following beneficial effects:

The coupled signal is generated by the coupler to the spurious coupling of the output of the power amplifier of the transmitting channel, and then the baseband processing unit combines the normally received received signal containing the spurious with the coupled signal, thereby effectively filtering out the spurs in the received signal. The interference of the spurs on the received signals of the baseband processing unit is reduced, the normal operation of the communication service is ensured, and the performance requirements of the transmit filter on the transmit channel are also reduced, and the operation cost of the small base station is reduced. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the embodiments will be briefly described below. Obviously, the drawings in the following description are only some of the present invention. For the embodiments, those skilled in the art can obtain other drawings according to the drawings without any creative work.

FIG. 1 is a schematic flowchart of a method for reducing interference according to an embodiment of the present invention;

2 is a schematic flowchart of another method for reducing interference according to an embodiment of the present invention; FIG. 3 is a schematic flowchart of still another method for reducing interference according to an embodiment of the present invention; FIG. 4 is a schematic flowchart of still another method for reducing interference according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a baseband processing unit according to an embodiment of the present disclosure;

6 is a schematic structural diagram of another baseband processing unit according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of another base station according to an embodiment of the present invention. detailed description

BRIEF DESCRIPTION OF THE DRAWINGS The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative work are within the scope of the present invention.

The performance specifications of the filter include the passband frequency range, the stopband frequency range, and the stopband rejection, which can be used to measure the filter selection performance. Taking the stop band suppression as an example, the higher the index, the better the suppression of the out-of-band interference signal. The performance index of the filter used on the transmitting channel and the receiving channel is not particularly limited in the embodiment of the present invention. In order to achieve the purpose of reducing the operating cost, in the scenario corresponding to each embodiment of the present invention, a low-performance filter can be used on both the transmitting channel and the receiving channel, and the low-performance filter used supports 50-60 dB transmission and reception isolation. .

Referring to FIG. 1 , a schematic flowchart of an embodiment of a method for reducing interference is provided. In this embodiment, the method includes the following steps:

5101. The baseband processing unit receives a first received signal from the first receiving channel, where the first received signal includes a spur of the first transmitting channel on the first receiving channel.

The first receiving channel shares the first antenna with the first transmitting channel.

By sharing the first antenna, the first receiving channel can be configured to correspond to the first transmitting channel, and the signal received by the first receiving channel includes leakage due to insufficient interference suppression capability of the filter on the first transmitting channel. The spurs on the first receiving channel.

5102, the baseband processing unit receives a first coupled signal from a second receive channel, the first coupled signal including a spur coupled by a first coupler from a power amplifier output of the first transmit channel.

Specifically, the first coupler spurs the output of the power amplifier from the first transmitting channel Extracting the preset portion to the second receiving channel for receiving channel processing, including performing spurious sampling, acquiring the first coupled signal, and the spur is in a receiving frequency band. The extracted preset part may be selected according to an empirical value or an experimental value, for example, may be 20 dB, 30 dB or other values, and only needs to ensure that there is no influence on the output of the transmitting channel.

S103. Combine the first received signal and the first coupled signal to filter out spurs in the first received signal.

In the embodiment of the present invention, the manner of combining the foregoing signals is not particularly limited, and various antenna combining algorithms in the prior art may be used.

Optionally, the baseband processing unit may combine the first received signal and the first coupled signal according to interference suppression combining; or

The baseband processing unit may combine the first received signal and the first coupled signal in a manner that the maximum ratio is combined.

Wherein, when the interference suppression combining is implemented, the existence of the colored noise interference will be taken into consideration, and the interference suppression combining and the target of suppressing the interference power and maximizing the received signal power as the weight adjustment are performed, and the received signal is realized by the effective compromise of the two targets. Maximize the signal to noise ratio.

When performing maximum ratio combining, the combined signal power in the combined signal can be maximized, so that the combined signal obtains an optimal signal to noise ratio.

Other antenna combining algorithms, such as gain combining, etc., are also applicable to the reduced interference method described in the embodiments of the present invention.

Referring to the embodiment shown in FIG. 2, steps S201-S202 are the same as steps S101-S102 in the embodiment shown in FIG. 1, and are not described herein.

After receiving the first received signal and the first coupled signal, the following steps may be performed: S203, the baseband processing unit demodulates the first received signal and the first coupled signal. The demodulation method may be a demodulation method of a baseband processing unit specified in the existing protocol, and is not particularly limited herein.

The baseband processing unit may demodulate the first received signal to obtain a useful signal and spurs in the first received signal, and obtain spur characteristic information in the first received signal, such as a delay. Information such as amplitude and phase. Similarly, after demodulating the first coupled signal, information such as delay, amplitude, and phase of spurious feature information in the first coupled signal may also be obtained.

S204, the baseband processing unit adjusts spurs in the first coupled signal, so that the first coupling The spurs in the combined signal and the spurious delay and amplitude in the first received signal are the same, and the phases are opposite.

S205. Superimpose the demodulated first received signal and the demodulated and adjusted first coupled signal to filter out spurious in the first received signal.

Specifically, by using an antenna combining algorithm, the delay, phase, and amplitude of the spurs in the first coupled signal can be adjusted such that the spurs in the first coupled signal have the same delay and amplitude as the spurs in the first received signal. That is, the alignment, the opposite phase, and then superimposing the two processed signals, the spurs in the first received signal can be completely canceled by the spurs in the first coupled signal, thereby completely filtering out the impurities in the first received signal. The purpose of the scattered. At the same time, since the first coupled signal is mainly spur, when the spur of the first received signal is filtered by the merging algorithm, the first coupled signal is also filtered out.

It should be noted that, in the steps S204-S205, the necessary steps in the process of combining the first received signal and the first coupled signal are not all steps, and other specific steps are different according to different antenna combining algorithms used. For details, refer to the existing antenna combining algorithm flow.

In this embodiment, spurs are filtered out by directly combining the first received signal with the first coupled signal. Optionally, the first received signal may be demodulated by the baseband processing unit to obtain a useful signal and spurs in the first received signal, and then the spurious in the first coupled signal is demodulated and adjusted to The spurs in a received signal have the same delay and amplitude, and the phases are opposite. Finally, the spurs in the first received signal are superimposed with the adjusted spurs in the first coupled signal, and only the first received signal will remain useful. signal. Using the method provided in the above embodiment, the coupling of the transmit channel power amplifier output is coupled by the coupler to generate a coupled signal, and then the baseband processing unit combines the normally received spurious-containing received signal with the coupled signal to filter out The spurs in the received signal reduce the interference of the spurs on the received signal of the base station, and also reduce the performance requirements of the transmit filter on the transmit channel, and reduce the operating cost of the small base station.

It should be noted that in the existing antenna transceiver system, the technical solution of multi-antenna combining is widely used to form a multi-receiving multi-issue system. For the multi-receiving system, the method provided by the embodiment of the present invention can also be used to reduce the interference of spurs. The following is an example of a two-issue (2T2R) system.

Please refer to the schematic flowchart of the method embodiment shown in FIG. 3. In this embodiment, the method includes the following steps:

S301. The baseband processing unit receives a first received signal from the first receiving channel, where the first received signal includes a spur of the first transmitting channel on the first receiving channel.

S302. Receive a first coupled signal from a second receiving channel, where the first coupled signal includes A spur coupled by the first coupler from a power amplifier output of the first transmit channel.

S303: Combine the first received signal and the first coupled signal to filter out spurs in the first received signal.

The manner in which the first received signal and the first coupled signal are combined may be interference suppression combining or maximum ratio combining. For details, refer to the related description in the embodiment shown in FIG. 1 and FIG. 2, and details are not described herein.

5304, the baseband processing unit receives a second received signal from the third receiving channel, and the second received signal includes a spur of the second transmitting channel on the third receiving channel.

S305. The baseband processing unit receives a second coupled signal from a fourth receive channel, the second coupled signal including a spur coupled from a power amplifier output of the second transmit channel by a second coupler.

5306. The baseband processing unit combines the second received signal and the second coupled signal to filter out spurs in the second received signal.

Similarly, the manner in which the second received signal and the second coupled signal are combined may also be interference suppression combining or maximum ratio combining, which is not described herein.

S307. The baseband processing unit combines the filtered first received signal and the filtered second received signal to obtain a third received signal.

Specifically, combining the first received signal and the second received signal after filtering out the spurious can be understood as a simple signal superimposing, similar to the parallel connection of two batteries in the circuit.

It is to be understood that S301-S303 and S304-S306 may be performed in the above-mentioned order; S301-S306 may be performed simultaneously or S301-S303 may be performed first, and S301-S303 may be performed, which is not limited in any embodiment of the present invention. The same execution steps are involved, as explained above. In the meantime, the expressions "first", "second", "third" and the like used in the embodiments of the present invention are only for the purpose of clear description, and there is no limitation on the present invention.

In this embodiment, the method of separately filtering out the spurious after each received signal is used, and then the third received signal is the final signal received by the baseband processing unit. For each received signal, it is not necessary to perform correlation calculation with the received signal or coupled signal of other channels, which reduces the coherence factor, and the filtering error is small, and the filtering effect is better. Of course, if there are three or more antennas and channels, the same can be done in the above manner.

Please refer to the schematic flowchart of the method embodiment shown in FIG. 4; in this embodiment, the method includes The following steps:

5401. The baseband processing unit receives a first received signal from the first receiving channel, where the first received signal includes a spur of the first transmitting channel on the first receiving channel.

5402, the baseband processing unit receives a first coupled signal from a second receive channel, the first coupled signal including a spur coupled from a power amplifier output of the first transmit channel by a first coupler.

5403. The baseband processing unit receives a second received signal from the third receiving channel, where the second received signal includes a spur of the second transmitting channel on the third receiving channel.

5404, the baseband processing unit receives a second coupled signal from the fourth receive channel, the second coupled signal including a spur coupled from a power amplifier output of the second transmit channel by the second coupler.

S405. The baseband processing unit combines the first received signal, the first coupled signal, the second received signal, and the second coupled signal to obtain a third received signal.

Wherein, the above four signals are directly combined, including using an antenna combining algorithm to eliminate spurs and receiving signal superposition and combining, that is, the spur elimination and multi-reception signal combining steps are performed synchronously. Optionally, the antenna diversity combining algorithm may adopt a combination manner as described in the embodiment shown in FIG. 1 and FIG. 2, and details are not described herein again.

In this embodiment, the method of uniformly combining all the received signals and the coupled signals is adopted, which reduces the flow of filtering out the spurs separately for each received signal, and the filtering efficiency is high, and the computing resources are saved, which can be directly obtained. The third received signal that needs to be used.

Please refer to the composition diagram of the embodiment of the baseband processing unit shown in FIG. 5. In this embodiment, the baseband processing unit includes:

The receiving unit 100 is configured to receive a first receiving signal from the first receiving channel, where the first receiving signal includes a spur of the first transmitting channel on the first receiving channel, where the first receiving channel Sharing a first antenna with the first transmit channel; and receiving a first coupled signal from the second receive channel, the first coupled signal including a first coupler coupled from a power amplifier output of the first transmit channel The spurs.

The merging unit 200 is configured to combine the first received signal and the first coupled signal to filter out spurs in the first received signal.

The receiving unit 100 can be connected to the first coupler through a receiver. The manner in which the first received signal and the first coupled signal are combined may be interference suppression combining or maximum ratio combining.

The merging unit 200 can be specifically used to:

Demodulating the first received signal and the first coupled signal, adjusting spurs of the first coupled signal, causing spurs in the first coupled signal and spurs in the first received signal The delay and the amplitude are the same, and the phases are opposite; the demodulated first received signal and the demodulated and adjusted first coupled signal are superimposed to filter out the spurs in the first received signal. After the merging, the spurs in the first received signal can be completely filtered out.

Optionally, the receiving unit 100 is further configured to:

Receiving a second received signal from the third receiving channel, the second received signal including a spur of the second transmitting channel on the third receiving channel, wherein the third receiving channel and the second transmitting The channel shares a second antenna; and receives a second coupled signal from the fourth receiving channel, the second coupled signal including a spur coupled by the second coupler from a power amplifier output of the second transmitting channel;

Optionally, the merging unit 200 is further configured to combine the second received signal and the second coupled signal to filter out spurs in the second received signal; and filter out spurious A received signal and a filtered second received signal are combined to obtain a third received signal.

Alternatively, in another embodiment of the present invention, the receiving unit 100 may be further configured to: receive a second receiving signal from a third receiving channel, where the second receiving signal includes a second transmitting channel in the a spur on the receiving channel, wherein the third receiving channel shares a second antenna with the second transmitting channel; and receives a second coupled signal from the fourth receiving channel, where the second coupled signal includes A coupler spurs coupled from a power amplifier output of the second transmit channel.

The merging unit 200 is further configured to combine the first received signal, the first coupled signal, the second received signal, and the second coupled signal to obtain a third received signal.

Optionally, the merging unit 200 may be configured to combine the first received signal, the first coupled signal, the second received signal, and the second coupled signal according to interference suppression combining; or The first received signal, the first coupled signal, the second received signal, and the second coupled signal are combined in a manner that the maximum ratio is combined.

It should be noted that the foregoing receiving unit 100 and the merging unit 200 may exist independently or The integration unit, and the receiving unit 100 or the merging unit 200 in the above baseband processing unit embodiment may be separately set in hardware form independently of the processor of the optical line terminal, and may be in the form of a microprocessor; The form is embedded in the processor of the baseband processing unit, and may also be stored in the memory of the baseband processing unit in software, so that the processor of the baseband processing unit invokes the operation corresponding to the above receiving unit 100 or the merging unit 200.

For example, in the embodiment shown in FIG. 5, the function of the merging unit 200 may be implemented by a processor of the baseband processing unit, and the function of the receiving unit 100 may be embedded in the processor, or may be separately set independently of the processor. It can also be stored in the form of software in a memory, which is called by the processor to implement its function. Of course, the receiving unit 100 may be integrated with the merging unit 200, or may be set independently, or may also be used as an interface circuit of the baseband processing unit, independently set or integrated. The embodiment of the present invention does not impose any limitation. The above processor may be a central processing unit (CPU), a microprocessor, a single chip microcomputer or the like.

Optionally, as shown in FIG. 6, in another embodiment of the present invention, the baseband processing unit includes: an interface circuit 300, a memory 400, and a processor 500 connected to the interface circuit 300 and the memory 400. The memory 400 is used to store a set of program codes, and the processor 500 is configured to call the program code stored in the memory 400 to perform the operations described in any of the method embodiments of FIG.

Referring to FIG. 7, a schematic diagram of a composition of an embodiment of a base station according to the present invention is provided. In this embodiment, the base station includes:

The antenna 11 can be used to transmit a signal amplified and filtered by the output of the baseband processing unit and to receive an external signal.

The transmitter 12 can be configured to perform a transmission channel processing on the signal output from the baseband processing unit and output the signal. A power amplifier (referred to as "amplifier") 13 can be used to amplify and output the signal output from transmitter 12.

The transmit filter 14 can be used to filter the signal output from the power amplifier 13 and transmit it to the external space via the antenna 11.

The receiving filter 15 is configured to perform filtering processing on the signal received by the antenna 11 and output the signal. The receiver 16 is configured to receive a signal output by the receiving filter 15, and perform a receiving channel processing on the signal outputted by the receiving filter 15 to obtain a received signal, where the received signal includes a transmitting channel in a receiving channel. The spurs on it. A coupler 17 can be used to couple the spurious at the output of the power amplifier 13 to the receiver 16 such that the receiver 16 performs a receive channel processing on the spurious coupled signal comprising the output of the power amplifier 13 Output.

The baseband processing unit 18 is configured to receive the received signal and the coupled signal output by the receiver 16, combine the received signal and the coupled signal, and filter out spurious in the received signal.

Alternatively, in another embodiment of the present invention, the transmit filter 11 and the receive filter 15 may be combined into one duplexer.

The baseband processing unit 18 may employ the baseband processing unit in the embodiment of any of FIG. 5 or FIG. 6, or may implement the apparatus for reducing interference in the embodiment of any of FIGS.

In a multi-transmission and multi-receiving system, there are at least two or more antennas and a transmitting channel and a receiving channel corresponding to the antenna. The structure and function of the base station are illustrated by taking a two-transmitting and two-receiving (2T2R) system as an example.

Please refer to FIG. 8, which is a schematic structural diagram of another embodiment of a base station according to the present invention. In this embodiment, the base station includes:

The first antenna 11 can be used to transmit a signal that has been amplified and filtered by the output of the baseband processing unit and to receive an external signal.

The first transmitter 12 is configured to perform a transmission channel processing on the signal output from the baseband processing unit and output the signal.

The first power amplifier (referred to as "first power amplifier") 13 can be used to amplify and output the signal output by the first transmitter 12.

The first transmit filter 14 is configured to filter the signal output by the first power amplifier 13 and transmit the signal to the external space via the first antenna 11.

The first receiving filter 15 is configured to filter and process the signal received by the first antenna 11.

The first receiver 16 is configured to receive a signal output by the first receiving filter 15, and perform a receiving channel processing on the signal output by the first receiving filter 15 to obtain a first received signal, where the A received signal includes a spur of the first transmit channel on the second receive channel.

a first coupler 17 operative to couple spurious at the output of the first power amplifier 13 to the first receiver 16 such that the first receiver 16 will include the output of the first power amplifier 13 The spurious first coupled signal is processed by the receiving channel and output.

The second antenna 21 can be used for transmitting and performing amplification and filtering after being output by the baseband processing unit Signal and receive external signals.

The second transmitter 22 is configured to perform a transmission channel processing on the signal output from the baseband processing unit and output the signal.

A second power amplifier (referred to as "second power amplifier") 23 can be used to amplify and output the signal output from the second transmitter 22.

The second transmit filter 24 is configured to filter the signal output by the second power amplifier 23 and transmit the signal to the external space via the second antenna 21.

The second receiving filter 25 is configured to filter the signal received by the second antenna 21 and output the signal.

The second receiver 26 is configured to receive a signal output by the second receiving filter 25, and perform a receiving channel processing on the signal output by the second receiving filter 25 to obtain a second receiving signal, where the The second received signal includes a spur of the second transmitting channel on the second receiving channel.

a second coupler 27 operative to couple the spurious at the output of the second power amplifier 23 to the second receiver 26 such that the second receiver 26 will include the output of the second power amplifier 23 The spur second coupled signal is processed by the receiving channel and output.

The baseband processing unit 18 is configured to receive the first received signal and the first coupled signal output by the first receiver 16, combine the first received signal and the first coupled signal, and filter out the first received signal a spur, and receiving the second received signal and the second coupled signal output by the second receiver 26, combining the second received signal and the second coupled signal to filter out impurities in the second received signal Dispersing, finally merging the spurious first received signal and the second received signal to obtain a third received signal.

Of course, in addition to the above manner of separately filtering out the spurs of each received signal and then filtering and filtering out the spurs of the multiple received signals, the baseband processing unit 18 can also implement multiple received signals and multiple paths. The scatter signal is directly combined at the same time to filter out spurs. In this manner, the baseband processing unit 18 is configured to receive the first received signal and the first coupled signal output by the first receiver 16, and the receiving station. The second received signal and the second coupled signal output by the second receiver 26 combine the first received signal, the first coupled signal, the second received signal, and the second coupled signal to obtain a filtered spurious portion Three receive signals.

The baseband processing unit 18 may employ the baseband processing unit in the embodiment of any of the embodiments of FIG. 5 or FIG. 6, or a device having the same function. The foregoing embodiment describes the specific situation of reducing interference in a two-transmitting and two-receiving (2T2R) base station. For other multi-received multi-receiving base stations, the same manner can be used for processing, and the spurious and combined multi-channel reception of each received signal is separately filtered out. The signal or the direct filtering of the spurs and the combined polygamy signal can be performed at the same time, and will not be described here.

It should be noted that the various embodiments in the present specification are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the embodiments are referred to each other. can. For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment.

Through the description of the above embodiments, the present invention has the following advantages:

The coupling of the output of the transmit channel power amplifier is coupled by the coupler to generate a coupled signal, and then the baseband processing unit combines the normally received spurious-containing received signal with the coupled signal to filter out spurious in the received signal and reduce The interference of the spurious on the received signal of the baseband processing unit also reduces the performance requirements of the transmit filter on the transmit channel, and reduces the operating cost of the small base station. Further, for the multi-receive multi-transmitting antenna system, the multiple received signals and the corresponding coupled signals can be combined at one time, and the final total received signal can be directly obtained, thereby improving the efficiency of filtering out spurious.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to the program instructions. The foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

The foregoing description of the method for reducing interference, the baseband processing unit, and the base station provided by the embodiments of the present invention is only for facilitating understanding of the method and core idea of the present invention. Meanwhile, for those skilled in the art. The present invention is not limited by the scope of the present invention.

Claims

Rights request

1. A method of reducing interference, which is characterized by including:

The baseband processing unit receives a first receive signal from a first receive channel, the first receive signal includes spurs of a first transmit channel on the first receive channel, wherein, the first receive channel and the first receive channel The first transmitting channel shares the first antenna;

The baseband processing unit receives a first coupled signal from the second receiving channel, and the first coupled signal contains spurs coupled by the first coupler from the power amplifier output of the first transmitting channel; the baseband processing The unit combines the first received signal and the first coupled signal to filter out spurs in the first received signal.

2. The method according to claim 1, characterized in that, the baseband processing unit combines the first received signal and the first coupled signal, and filters out spurs in the first received signal, including : The baseband processing unit demodulates the first received signal and the first coupled signal, adjusts the spurs in the first coupled signal, and makes the spurs in the first coupled signal and the first coupled signal The spurs in the received signal have the same delay and amplitude, but opposite phases;

The baseband processing unit superimposes the demodulated first received signal and the demodulated and adjusted first coupled signal, and filters out spurs in the first received signal.

3. The method of claim 1 or 2, further comprising:

The baseband processing unit receives a second receive signal from a third receive channel, and the second receive signal contains spurs of the second transmit channel on the third receive channel, wherein, the third receive channel and The second transmitting channel shares a second antenna;

The baseband processing unit receives a second coupled signal from the fourth receiving channel, and the second coupled signal contains spurs coupled by the second coupler from the power amplifier output of the second transmitting channel; the baseband processing The unit combines the second received signal and the second coupled signal, and filters out spurs in the second received signal;

The baseband processing unit combines the spurious first received signal and the spurious filtered second received signal to obtain a third received signal.

4. The method according to any one of claims 1 to 3, characterized in that, the baseband processing unit combining the first received signal and the first coupled signal includes:

The baseband processing unit combines the first received signal and the first coupled signal in an interference suppression combining manner; or

The baseband processing unit combines the first received signal and the first coupled signal in a maximum ratio combining manner.

5. A method of reducing interference, characterized by including:

The baseband processing unit receives a first coupled signal from the second receiving channel, and the first coupled signal contains spurs coupled by the first coupler from the power amplifier output of the first transmitting channel; the baseband processing The unit receives a second receive signal from a third receive channel, the second receive signal includes spurs of the second transmit channel on the third receive channel, wherein, the third receive channel and the second receive channel The transmitting channel shares the second antenna;

The baseband processing unit receives a second coupled signal from the fourth receiving channel, and the second coupled signal contains spurs coupled by the second coupler from the power amplifier output of the second transmitting channel; the baseband processing The unit combines the first received signal, the first coupled signal, the second received signal and the second coupled signal to obtain a third received signal.

6. The method of claim 5, wherein the baseband processing unit combines the first received signal, the first coupled signal, the second received signal and the second coupled signal to obtain The third received signal includes:

The baseband processing unit combines the first received signal, the first coupled signal, the second received signal and the second coupled signal in an interference suppression combining manner; or

The baseband processing unit combines the first received signal, the first coupled signal, the second received signal and the second coupled signal in a maximum ratio combining manner.

7. A baseband processing unit, characterized by including:

A receiving unit configured to receive a first receiving signal from a first receiving channel, the first receiving signal containing spurs of the first transmitting channel on the first receiving channel, wherein the first receiving channel and The first transmit channel shares a first antenna; and receives a first coupled signal from the second receive channel, the first coupled signal includes a signal coupled by the first coupler from the power amplifier output end of the first transmit channel. stray;

A combining unit, configured to combine the first received signal and the first coupled signal, and filter out spurs in the first received signal.

8. The baseband processing unit according to claim 7, characterized in that the merging unit is specifically used for:

Demodulating the first received signal and the first coupled signal, and adjusting spurs of the first coupled signal so that spurs in the first coupled signal and spurs in the first received signal are consistent The delay and amplitude are the same, but the phase is opposite; the demodulated first received signal and the demodulated and adjusted first coupled signal are superimposed, and spurs in the first received signal are filtered out.

9. The baseband processing unit according to claim 7 or 8, characterized in that the receiving unit is also used for:

Receive a second receive signal from a third receive channel, the second receive signal includes spurs of the second transmit channel on the third receive channel, wherein, the third receive channel and the second transmit channel The channels share a second antenna; and receiving a second coupled signal from the fourth receiving channel, the second coupled signal containing spurs coupled by the second coupler from the power amplifier output of the second transmitting channel;

The combining unit is further configured to combine the second received signal and the second coupled signal, filter out spurs in the second received signal; and combine the spurious filtered first received signal with the filtered signal. The second received signals after spurious removal are combined to obtain a third received signal.

10. The baseband processing unit according to any one of claims 7 to 9, characterized in that the combining unit is specifically configured to combine the first received signal and the first coupled signal in an interference suppression manner. Combine; or combine the first received signal and the first coupled signal according to the maximum ratio way to merge.

11. A baseband processing unit, characterized in that it includes:

A receiving unit configured to receive a first receiving signal from a first receiving channel, the first receiving signal containing spurs of the first transmitting channel on the first receiving channel, wherein the first receiving channel and The first transmit channel shares a first antenna; receives a first coupled signal from the second receive channel, the first coupled signal includes a hybrid signal coupled by the first coupler from the power amplifier output end of the first transmit channel. Scatter; receive the second receive signal from the third receive channel, the second receive signal includes the spur of the second transmit channel on the third receive channel, wherein, the third receive channel and the third receive channel The two transmit channels share a second antenna; and receive a second coupled signal from the fourth receive channel, where the second coupled signal contains spurs coupled by the second coupler from the power amplifier output end of the second transmit channel;

A combining unit, configured to combine the first received signal, the first coupled signal, the second received signal and the second coupled signal to obtain a third received signal.

12. The baseband processing unit of claim 11, wherein the merging unit is specifically configured to combine the first received signal, the first coupled signal, the second received signal and the second The coupled signals are combined in an interference suppression combining manner; or the first received signal, the first coupled signal, the second received signal and the second coupled signal are combined in a maximum ratio combining manner.

13. A computer program product, including a computer-readable medium, the computer-readable medium including a set of program codes for executing the method according to any one of claims 1-4 or 5-6.

14. A base station, characterized by including:

at least one antenna;

The transmitter is used to process the signal output by the baseband processing unit and then output it; the power amplifier is used to amplify the signal output by the transmitter and then output it;

A transmission filter, used to filter the signal output by the power amplifier and then transmit it to the external space through the antenna; A receiving filter, used for filtering the signal received by the antenna and then outputting it; A receiver, used for receiving the signal output by the receiving filter, and performing receiving channel processing on the signal output by the receiving filter to obtain a received signal. and then output, wherein the received signal contains spurs of the transmitting channel on the receiving channel;

A coupler, used to couple the spurs at the output end of the power amplifier to the receiver, so that the receiver processes the coupled signal containing the spurs at the output end of the power amplifier and outputs it after processing by the receiving channel;

The baseband processing unit is configured to receive the received signal and the coupled signal output by the receiver, combine the received signal and the coupled signal, and filter out spurs in the received signal.

15. The base station according to claim 14, characterized in that: the baseband processing unit is the baseband processing unit according to any one of claims 7-12.