Signal processing apparatus

Abstract

The present application provides a signal processing apparatus, comprising a first frequency-selective unit, a coupling unit and a second frequency-selective unit. The first frequency-selective unit can filter most of a first signal, and reflect the remaining portion of the first signal and the entirety of a second signal. The coupling unit couples a small portion of an interference signal reflected back by the first frequency-selective unit and a desired signal to a frequency-selective monitoring channel (a second frequency-selective unit). Thus, the amplitude of the interference signal at the entrance of the frequency-selective monitoring channel is reduced, thereby decreasing the generation of nonlinear products, mitigating the impact on the signal-to-noise ratio of the system, and meeting the system requirements of the frequency-selective monitoring channel.

Description

A signal processing device

[0001] The present application claims priority to the Chinese patent application No. 202411282315.X, filed on September 12, 2024, with the State Intellectual Property Office of China, and the Chinese patent application No. 202411282315.X has the invention name of "A signal processing device", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of communication technology, more particularly, to a signal processing device. BACKGROUND

[0003] With the evolution of transceivers, in order to realize the miniaturization and low cost of high-power frequency division duplex (FDD) remote radio unit (RRU) modules, reducing the number of duplex cavities is a key direction. At the same time, because of the decrease in the suppression level caused by the reduction of the number of duplex cavities, the linearity and dynamic requirements of the radio frequency transceiver channel are becoming higher and higher, so it is necessary to introduce a corresponding high-linearity high-dynamic receive frequency selection monitoring channel for monitoring and cancellation. The required useful signal is coupled and looped back to the receive frequency selection channel, and then sampled and cancelled by the digital part. Through the cancellation channel architecture, the number of metal cavity duplexers is greatly reduced, the out-of-band suppression level specification is reduced, and the key goal of miniaturization and low cost of high-power RRU is achieved.

[0004] Currently, the output signal of the signal amplifier contains the useful signal that needs to be monitored and the out-of-band interference signal. For example, in the FDD application scenario, the out-of-band interference signal is generally the transmission signal (TX) frequency band transmission signal, and the useful signal is the receive signal (RX) frequency band receive signal. Through the forward coupler in the later stage of the signal amplifier, the output signal can be looped back to the frequency selection monitoring channel. Due to the limitation of the coupling coefficient of the forward coupling and the signal-to-noise ratio (SNR) requirement of the frequency selection monitoring channel, the interference signal amplitude at the entrance of the frequency selection monitoring channel is large, for example, ≥1x decibel relative to one milliwatt (dBm). Due to the linearity and dynamic limitations of the current traditional architecture frequency selection monitoring channel and key devices (for example, the current capability is only 7xdBc@1xdBm, which is far from meeting the system application requirements), the nonlinear intermodulation products of the interference signal will hit the useful signal within the band, causing the SNR of the frequency selection monitoring channel to deteriorate dramatically, affecting the system index requirements after the reduction of the number of RRU duplex cavities, so it cannot support the reduction of the number of duplex cavities, and cannot achieve the key appeal of miniaturization and low cost. SUMMARY

[0005] The application provides a signal processing device, which can couple part of interference signals and required signals reflected by a diplexer to a frequency selection monitoring network through reverse coupling, reduces the amplitude of interference signals at the entrance of a frequency selection monitoring channel, improves the dynamic capability and linear capability of the frequency selection monitoring channel, and meets the system requirements of the frequency selection monitoring channel.

[0006] In a first aspect, a signal processing device is provided, which comprises: a first frequency selection unit, configured to filter a first signal from a coupling unit and reflect part of the first signal to the coupling unit, and to fully reflect a second signal from the coupling unit to the coupling unit; the coupling unit, configured to couple the part of the first signal and the second signal reflected by the first frequency selection unit to a second frequency selection unit; and the second frequency selection unit, configured to filter the second signal and send the second signal to a digital channel for cancellation.

[0007] In the technical solution, the first frequency selection unit can filter most of the first signal, and reflect a small part of the first signal and all of the second signal, and the coupling unit can couple the small part of the interference signal and the required signal reflected by the first frequency selection unit to the frequency selection monitoring channel (the second frequency selection unit), so as to reduce the amplitude of the interference signal at the entrance of the frequency selection monitoring channel, thereby reducing the product of the nonlinear product, reducing the influence on the system signal-to-noise ratio, and meeting the system requirements of the frequency selection monitoring channel.

[0008] In combination with the first aspect, in some implementations of the first aspect, the coupling unit comprises a reverse coupling port, which is configured to couple the part of the first signal and the second signal reflected by the first frequency selection unit to the second frequency selection unit.

[0009] In the technical solution, the structure of the coupling unit is used to couple the small part of the interference signal and the required signal reflected by the diplexer to the frequency selection monitoring channel through the reverse coupling port, which can be implemented based on the existing structure of the coupling unit, and additional structural improvement is avoided.

[0010] In combination with the first aspect, in some implementations of the first aspect, the coupling unit further comprises an isolation port, which is configured to be connected to a load.

[0011] In the technical solution, the coupling degree and the directivity coefficient of the coupling unit are ensured to be normal by connecting an external matching load, so that the coupling unit can work normally.

[0012] With reference to the first aspect, in some implementations of the first aspect, the coupling unit further includes a first input port configured to input the first signal and the second signal, and a first output port configured to output the first signal and the second signal.

[0013] In this technical solution, the original structure of the coupling unit is used to realize signal transmission.

[0014] With reference to the first aspect, in some implementations of the first aspect, the second frequency selection unit includes a second input port configured to receive the coupled part of the first signal and the second signal reflected by the first frequency selection unit, and a second output port configured to send the second signal after amplification to a digital channel for cancellation.

[0015] In this technical solution, the original structure of the second frequency selection unit does not need to be improved, and can be implemented based on the existing structure of the frequency selection monitoring channel, avoiding additional structural and layout improvements.

[0016] With reference to the first aspect, in some implementations of the first aspect, the amplitude of the first signal is X decibels milliwatts dBm, the amplitude of the second signal is Y dBm, the coupling coefficient of the coupling unit is C dBm, the return loss RL of the first frequency selection unit is R dB, the amplitude of the part of the first signal coupled to the second frequency selection unit is (X-C-R) dBm, and the amplitude of the second signal coupled to the second frequency selection unit is (Y-C) dBm.

[0017] In this technical solution, the amplitude of the first signal coupled to the second frequency selection unit is reduced (from (X-C) dBm to (X-C-R) dBm), and the amplitude of the nonlinear product in the in-band of the second signal is also reduced (from (X-C-P) dBm to (X-C-R-P) dBm), where P is the amplitude of the power value of the passive intermodulation (PIM) signal, so the influence on the signal-to-noise ratio of the system is reduced, and the system requirements can be met.

[0018] With reference to the first aspect, in some implementations of the first aspect, the first signal and the second signal are amplified signals.

[0019] With reference to the first aspect, in some implementations of the first aspect, the first signal is a transmit frequency band signal, and the second signal is a receive frequency band signal.

[0020] In a second aspect, a signal processing method is provided. The method is applied to a signal processing device, which comprises a first frequency selection unit, a coupling unit, and a second frequency selection unit. The method comprises: the signal processing device filtering a first signal by the first frequency selection unit and reflecting part of the first signal to the coupling unit, and filtering a second signal by the first frequency selection unit and fully reflecting the second signal to the coupling unit; the signal processing device coupling the first signal and the second signal reflected by the first frequency selection unit to the second frequency selection unit by the coupling unit; and the signal processing device filtering the second signal by the second frequency selection unit and sending the second signal to a digital channel for cancellation.

[0021] In the technical solution, the signal processing device can filter most of the first signal by the first frequency selection unit, and reflect a small part of the first signal and all of the second signal. Then, the signal processing device couples the small part of the interference signal and the required signal reflected by the first frequency selection unit to the frequency selection monitoring channel (the second frequency selection unit) by the coupling unit, so as to reduce the amplitude of the interference signal at the entrance of the frequency selection monitoring channel, thereby reducing the nonlinear product, reducing the influence on the signal-to-noise ratio of the system, and meeting the system requirements of the frequency selection monitoring channel.

[0022] In a third aspect, a computer readable storage medium is provided. The computer readable medium stores program code for execution by an apparatus. The program code includes code for performing the method of the second aspect.

[0023] In a fourth aspect, a computer program product including instructions which, when executed on a computer, cause the computer to carry out the method of the second aspect. BRIEF DESCRIPTION OF DRAWINGS

[0024] FIG. 1 shows a circuit schematic diagram of an electronic device according to an embodiment of the present application.

[0025] FIG. 2 shows a schematic diagram of a radio frequency communication system.

[0026] FIG. 3 shows a structural schematic diagram of a signal processing device 300 according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] The technical solutions in the present application will be described below with reference to the accompanying drawings.

[0028] The embodiments described in the present application are only partial embodiments, not all embodiments. Based on the content described in the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the embodiments of the present application.

[0029] The present application can be applied to various communication systems, such as a global system for mobile communication (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) system, a general packet radio service (GPRS), a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD), a universal mobile telecommunication system (UMTS), a worldwide interoperability for microwave access (WiMAX) communication system, a new radio (NR), a future communication system, inter-satellite communication, and satellite communication, and the like. The antenna and / or antenna system described in the embodiments of the present application can also be applied to other communication systems, which are not described in detail herein.

[0030] The electronic equipment product involved in the present application is not limited to a macro station, a small station, a pole micro station, a backpack station, and the like FDD base station product. The embodiments of the present application are not limited thereto.

[0031] FIG. 1 is a circuit schematic diagram of an internal circuit of an electronic equipment according to an embodiment of the present application.

[0032] As shown in FIG. 1, the electronic equipment can include an application processor (AP), a baseband module, a digital-to-analog converter, a radio frequency module, and an antenna module.

[0033] The application processor can be used to run an open operating system and various applications on the operating system, and is responsible for the control of the entire system. In the process of transmitting a signal to the outside, the application processor can transmit a digital signal, such as a voice signal, to the baseband module.

[0034] The baseband module can be used to encode and modulate the received digital signal, for example, in the process of transmitting a signal to the outside, the baseband module encodes and modulates the digital signal, so that the information occupies a smaller space, and can resist interference and attenuation in the channel, and improve the link performance.

[0035] A digital-to-analog converter can be used to convert a digital signal output by the baseband module into an analog signal for processing by the radio frequency module. Alternatively, an analog signal output by the radio frequency module can be converted into a digital signal for processing by the baseband module.

[0036] The radio frequency module can be used to modulate the frequency of a received electrical signal and amplify the power. For example, in the process of transmitting an electrical signal to the outside, the radio frequency module modulates the analog signal from a low frequency to a designated high frequency band to become a radio frequency signal that can be transmitted in the air, and amplifies the power of the radio frequency signal to meet the communication requirements.

[0037] The antenna module can be used to transmit the radio frequency signal processed by the radio frequency module to the outside, or receive external electromagnetic wave signals and transmit them to the radio frequency module.

[0038] Currently, the frequency division duplex (FDD) frequency band is usually applied in FDD communication mode. In order to realize the miniaturization and low cost of the high-power FDD RRU module, reducing the number of duplex cavities is a key direction. However, the reduction of the number of duplex cavities of the duplex brings the problem of the reduction of the out-of-band noise suppression level, so a frequency selection monitoring channel needs to be introduced to monitor and cancel. The required useful signal is coupled and looped back to the receiving frequency selection channel, and then sampled and canceled by the digital part. By constructing the cancellation channel architecture, the number of metal cavity duplexers is greatly reduced, the out-of-band suppression level is reduced, and the key goal of miniaturization and low cost of high-power RRU is achieved.

[0039] FIG. 2 shows a schematic diagram of a radio frequency communication system.

[0040] As shown in FIG. 2, the radio frequency communication system includes a signal amplifier 210, a coupler 220, a duplexer 240, an antenna 250, and a frequency selection monitoring channel 230.

[0041] The signal amplifier 210 is used to amplify the power of a radio frequency signal. The radio frequency signal includes a TX frequency band transmission signal (hereinafter referred to as TX signal) and a RX frequency band reception signal (hereinafter referred to as RX signal), that is, the output signal of the signal amplifier 210 includes the amplified TX signal and the amplified RX signal.

[0042] For example, in the FDD scenario, the TX signal is generally an out-of-band interference signal, and the signal amplitude is about 3x dBm-5x dBm. The RX signal is generally a useful signal, and the signal amplitude is about -1x-3x dBm / MHz.

[0043] It should be understood that in the FDD scenario, the TX signal power output by the signal amplifier is high, and due to the inherent nonlinear effect of the signal amplifier, the noise signal amplitude generated outside the TX signal carrier is also high. If the out-of-band noise frequency band of the duplexer has insufficient suppression, the out-of-band noise will leak to the receiving channel through the duplexer, affecting the receiving sensitivity of the system, and further affecting the coverage traffic of the module. On the other hand, the out-of-band noise will leak to the environment through the duplexer and the antenna, affecting the normal working performance of other modules.

[0044] The coupler 220 is used to transmit signals or energy and ensure proper electrical isolation or matching. The working principle of the coupler is to place two transmission channels (for example, channel a and channel b in FIG. 2) close enough to each other, and through the design of the electrical length, one of the channels will conduct part of its own energy to the other channel due to the signal propagation characteristics. In FIG. 2, the output signal of the signal amplifier 210 is transmitted through the input end to the output end of the channel a of the coupler to the antenna end, and a small part of the signal energy is transmitted through the coupling end 1 to the channel connected to the coupling end 1 (for example, the frequency selection monitoring channel 230 in FIG. 2). The isolation end 2 ensures the coupling degree and directivity coefficient of the coupler 220 to be normal by connecting an external matching load, so as to realize the normal work of the coupler 220. Since the coupler 220 is a passive device, the coupling end 1 and the isolation end 2 are reciprocal, and the electrical parameters are completely consistent, so the coupling end 1 and the isolation end 2 can be used to transmit signal energy to the target channel. When the coupling end 1 is used to transmit signals, we generally call it forward coupling, and when the isolation end 2 is used to transmit signals, we call it reverse coupling.

[0045] In this application, when the coupling end 1 is used to transmit signals, the coupling end 1 can also be called a forward coupling end; when the isolation end 2 is used to transmit signals, the isolation end 2 can also be called a reverse coupling end. The embodiments of the present application do not limit the names of the terms.

[0046] In the embodiments of the present application, the coupler can be a device coupler or a microstrip coupler. The coupler can be coupled with the duplexer or can be independently arranged. The coupler can also be packaged with the frequency selection monitoring channel in one chip, and the embodiments of the present application do not limit this.

[0047] The frequency selection monitoring channel 230 is used to filter out interference signals and sample and cancel useful signals from the digital part.

[0048] As shown in FIG. 2, part of the TX signal and RX signal are coupled to the coupling end 1 of the coupler, enter the frequency selection monitoring channel 230 at the coupling end 1, the RX filter 231 in the frequency selection monitoring channel 230 filters the interference signal (TX signal) to reduce its impact on the monitoring channel. Then the RX signal is amplified by the amplifier 232 and enters the digital channel 233, and the monitoring signal (RX signal) is cancelled by the digital channel 233.

[0049] Among them, the duplexer 240 is a kind of bidirectional filtering device. The duplexer 240 is used to isolate the transmit signal and the receive signal, to ensure that the receiving and transmitting can work normally at the same time. The transmitting and receiving signals can be separated by physical or electronic methods, so as to avoid mutual interference between the signals.

[0050] The working principle of the duplexer is based on the separation technology of signals. In a wireless communication system, the duplexer allows the device to transmit and receive on one channel at the same time. It distinguishes the frequency range of the input or output signal by using a filter, so as to ensure that the transmitting and receiving signals will not interfere with each other. In FDD (frequency division duplexing) mode, the duplexer uses two different frequency bands, one for transmission and the other for reception, allowing the device to transmit and receive signals at the same time.

[0051] As shown in FIG. 2, the TX signal and RX signal enter the duplexer 240 through the channel a of the coupler 220, the TX signal is transmitted by the duplexer 240 to the antenna 250 for radiation, providing coverage of the cell. The RX signal is reflected by the duplexer to the coupler 220.

[0052] For example, the required signal (including out-of-band interference signal) is looped back to the frequency selection monitoring channel 230 through the coupling end 1 of the coupler 220 after the signal amplifier 210. Among them, the amplitude of the TX signal output by the signal amplifier 210 is X dBm, the amplitude of the RX signal output by the signal amplifier 210 is Y dBm, the coupling coefficient of the coupler 220 is C dBm, the amplitude of the TX signal coupled to the input port of the frequency selection monitoring channel 230 at the coupling end 1 is (X-C) dBm, the amplitude of the RX signal coupled to the input port of the frequency selection monitoring channel 230 at the coupling end 1 is (Y-C) dBm, the TX signal as an interference signal will produce a nonlinear product (amplitude: (X-C-P) dBm) after entering the frequency selection monitoring channel, which will hit the RX signal in-band and enter the digital channel 233.

[0053] Currently, the output signals (RX signals and TX signals) can be looped back to the frequency selection monitoring channel through the forward coupling end of the coupler in the rear stage of the signal amplifier. Due to the coupling coefficient of the forward coupling and the signal-to-noise ratio (SNR) requirement of the frequency selection monitoring channel, the amplitude of the interference signal (TX signal) at the entrance of the frequency selection monitoring channel is large. For example, (X-C) dBm≥1×dBm. The amplitude of the interference signal is too large, which causes the amplitude of the nonlinear product generated after the interference signal enters the frequency selection monitoring channel to increase, and the nonlinear product of the interference signal can hit the in-band useful signal, causing the SNR of the frequency selection monitoring channel to deteriorate sharply, for example, the system SNR may deteriorate by more than 20 dB, affecting the system index requirement after the number of RRU duplex cavity is reduced, and therefore the duplex cavity cannot be reduced, and the miniaturization and low cost cannot be realized.

[0054] In summary, the present application provides a signal processing device and a signal processing system, which can couple a small part of the interference signal and the required signal reflected by the duplex filter to the frequency selection monitoring channel through the reverse coupling end, reduce the amplitude of the interference signal at the entrance of the frequency selection monitoring channel, reduce the nonlinear product, reduce the influence on the system SNR, and meet the system requirements of the frequency selection monitoring channel.

[0055] The signal processing device provided by the embodiment of the present application is described in detail below.

[0056] Referring to FIG. 3, as an example, FIG. 3 shows a structural schematic diagram of the signal processing device 300 provided by the embodiment of the present application.

[0057] As shown in FIG. 3, the signal processing device 300 includes a coupling unit 320, a second frequency selection unit 330, and a first frequency selection unit 340.

[0058] For example, the first frequency selection unit 340 can be a duplex filter, for example, the first frequency selection unit 340 is the duplex filter 240 shown in FIG. 2.

[0059] For example, the coupling unit 320 can be a coupler, for example, the coupling unit 320 is the coupler 220 shown in FIG. 2.

[0060] For example, the second frequency selection unit 330 can be a frequency selection monitoring channel, for example, the second frequency selection unit 330 is the frequency selection monitoring channel 230 shown in FIG. 2.

[0061] The structure is described in detail below.

[0062] The first frequency selection unit 340 is configured to filter the first signal from the coupling unit 320 and reflect a part of the first signal to the coupling unit 320, and fully reflect the second signal from the coupling unit 320 to the coupling unit 320.

[0063] The first signal and the second signal are amplified signals, for example.

[0064] Optionally, the structure further comprises a first amplification unit 310, for example, the first amplification unit 310 is the signal amplifier 210 shown in FIG. 2.

[0065] The first amplification unit 310 transmits the amplified signals (the first signal and the second signal) to a coupling unit 320.

[0066] The coupling unit 320 comprises a channel a and a channel b, the channel a comprises a first input port and a first output port, the first input port is used for inputting the first signal and the second signal, and the first output port is used for outputting the first signal and the second signal.

[0067] Correspondingly, the first frequency selection unit 340 receives the first signal and the second signal from the first output port.

[0068] The first signal and the second signal are reflected in the first frequency selection unit 340, at this time, since the first frequency selection unit 340 can filter the first signal, part of the first signal can be transmitted to the antenna for radiation through the first frequency selection unit 340, for example, the antenna 350 shown in FIG. 3, and part of the first signal is reflected to the coupling unit 320. The first frequency selection unit 340 fully reflects the second signal, that is, all the second signal can be reflected to the coupling unit 320.

[0069] It can be understood that since the first frequency selection unit 340 and the antenna 350 are in a matching state, most of the energy of the first signal can be radiated to the cell through the antenna 350, and only a small part of the energy is reflected to the first frequency selection unit 340 through the antenna 350, and then enters the coupling unit 320.

[0070] For example, the reflection coefficient of the first frequency selection unit 340 to the first signal is -1x decibel (dB), and the reflection coefficient of the first frequency selection unit 340 to the second signal is 0 dB.

[0071] The coupling unit 320 is used for coupling the part of the first signal and the second signal reflected by the first frequency selection unit 340 to the second frequency selection unit 330.

[0072] In a possible implementation, the coupling unit 320 comprises a reverse coupling port 2, which is used for coupling the part of the first signal and the second signal reflected by the first frequency selection unit 340 to the second frequency selection unit 330.

[0073] The part of the first signal and the second signal are reflected to the coupling unit 320 through the first frequency selection unit 340, and are coupled on the reverse coupling port 2 of the coupling unit 320 to enter the second frequency selection unit 330.

[0074] It should be noted that the part of the first signal coupled at the reverse coupling port 2 is the first signal reflected by the first frequency selection unit 340. It can be understood that most of the first signal is radiated to the antenna 350 through the first frequency selection unit 340, and only a small part of the first signal can be reflected to the coupling unit 320. Therefore, the amplitude of the first signal entering the second frequency selection unit 330 is greatly reduced.

[0075] The amplitude of the part of the first signal coupled at the reverse coupling port 2 is reduced to 1xdB or more.

[0076] The amplitude of the interference signal entering the second frequency selection unit 330 is greatly reduced, and the dynamic capability of the second frequency selection unit 330 can be improved by 1xdB or more.

[0077] In a possible implementation, the coupling unit 320 further includes an isolation port 1, and the isolation port 1 is used to connect a load.

[0078] It can be understood that the coupling degree and the directivity coefficient of the coupling unit 320 are ensured to be normal by externally connecting a matching load, so that the coupling unit 320 works normally.

[0079] The second frequency selection unit 330 is used to filter the second signal and send the second signal to the digital channel 333 for cancellation.

[0080] The second frequency selection unit 330 includes a second input port 3 and a second output port 4. The second input port 3 is used to receive the part of the first signal reflected by the first frequency selection unit 340 and the second signal, and the second output port 4 is used to send the second signal to the digital channel 333 for cancellation after amplification.

[0081] The part of the first signal and the second signal enter the second frequency selection unit 330 through the second input port 3, and part of the first signal is filtered out through the filter 331 in the second frequency selection unit 330. That is, the second signal passes through the filter 331, and the second signal enters the digital channel 333 for cancellation through the second output port 4.

[0082] Optionally, the second frequency selection unit 330 can further include an amplifier 332, and the second signal enters the digital channel 333 for cancellation through the second output port 4 after amplification.

[0083] It can be understood that the filter 331 is a second signal filter.

[0084] It should be noted that the amplitude of the first signal entering the second frequency selection unit 330 is greatly reduced, and the amplitude of the nonlinear product generated is also reduced. Even if the nonlinear product hits the second signal band, the impact is reduced, for example, the impact on the system signal-to-noise ratio is reduced.

[0085] For example, due to the significant reduction of the interference signal entering the second frequency selection unit 330, according to the 1:2 relationship between the amplitude of the interference signal and the nonlinear product, the amplitude of the nonlinear intermodulation product generated by the interference signal is reduced by 2xdB or more. The comprehensive linear capability is improved by 3xdB or more.

[0086] The working method of the signal processing device is exemplarily described below.

[0087] For example, the first amplified signal and the second signal output by the first amplification unit 310 enter the first frequency selection unit 340 through the channel a in the coupling unit 320 in the rear stage. The first signal is radiated to the antenna 350 through the first frequency selection unit 340, and part (a small amount) of the first signal can be reflected to the coupling unit 320. The second signal can be fully reflected to the coupling unit 320. The required signal (including the out-of-band interference signal) is looped back to the second frequency selection unit 330 through the reverse coupling end 2 of the coupling unit 320. Part of the first signal entering the second frequency selection unit 330 is filtered out by the filter 331, and the second signal passes through the filter 331 and enters the digital channel 333 for cancellation.

[0088] In the formula, the amplitude of the first signal output by the first amplification unit 310 is XdBm, the amplitude of the second signal output by the first amplification unit 310 is YdBm, the coupling coefficient of the coupling unit 320 is CdBm, the return loss (RL) of the first frequency selection unit is R dB, the amplitude of the first signal coupled to the second input port 3 of the second frequency selection unit 330 through the reverse coupling end 2 is (X-C-R) dBm, the amplitude of the second signal coupled to the second input port 3 of the second frequency selection unit 330 through the reverse coupling end 2 is (Y-C) dBm, the first signal acts as an interference signal, and a nonlinear product (amplitude: (X-C-R-P) dBm) is generated after entering the second frequency selection unit 330, wherein P is the amplitude of the power value of the passive intermodulation (PIM) signal. The nonlinear product hits the second signal band and enters the digital channel 333.

[0089] It should be noted that the filter 331 can filter out the signal out of the monitoring signal (second signal), that is, the filter 331 can filter out the first signal. The nonlinear product hits the second signal band, that is, the filter 331 cannot filter out the nonlinear product generated by the first signal.

[0090] As described above, the amplitude of the first signal coupled to the second frequency selection unit 330 through the reverse coupling port 2 is reduced (from (X-C) dBm to (X-C-R) dBm), and the amplitude of the nonlinear product in the second signal band is also reduced (from (X-C-P) dBm to (X-C-R-P) dBm), so the impact on the system signal-to-noise ratio is reduced, and the system requirements can be met.

[0091] It should be understood that since the first signal is low enough, the nonlinear product generated in the second frequency selection unit 330 is also low enough, and the impact on the signal-to-noise ratio of the second frequency selection unit 330 can be ignored, so that the impact on the second frequency selection unit 330 is minimized, and then the monitoring signal (the second signal) is canceled through the digital channel 333 by an algorithm. After cancellation, the noise output from the first frequency selection unit 340 and the antenna 350 can be reduced to a desired level, and will not interfere with itself and the outside world.

[0092] Based on the above technical solution, in the embodiment of the application, the part of the interference signal and the required signal reflected by the diplexer are coupled to the frequency selection monitoring network through reverse coupling, the amplitude of the interference signal at the entrance of the frequency selection monitoring channel is reduced, the dynamic capability and the linear capability of the frequency selection monitoring channel are improved, and the system requirements of the frequency selection monitoring channel are met.

[0093] In a possible implementation, the embodiment of the application can improve the dynamic capability of the frequency selection monitoring channel, improve the linear capability, realize the reduction of the suppression degree of the metal cavity diplexer, reduce the volume of the base station, reduce the weight, and realize the key evolution target.

[0094] Those skilled in the art can understand that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the application.

[0095] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the system, device and unit described above can refer to the corresponding processes in the foregoing method embodiments, which will not be described here.

[0096] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other manners. For example, the described device embodiments are merely schematic. The division of the units is merely logical function division. There can be other division manners in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0097] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0098] In addition, each functional unit in the various embodiments of the present application can be integrated into a processing unit, or each unit can be a physically independent unit, or two or more units can be integrated into a unit.

[0099] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application can be embodied in the form of a software product, and the computer software product is stored in a storage medium, and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0100] The above is merely specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A signal processing device, characterized by, The method comprises: a first frequency selection unit for filtering a first signal from a coupling unit and reflecting part of the first signal to the coupling unit, and fully reflecting a second signal from the coupling unit to the coupling unit; the coupling unit for coupling the part of the first signal and the second signal reflected by the first frequency selection unit to a second frequency selection unit; the second frequency selection unit for filtering the second signal and sending the second signal to a digital channel for cancellation.

2. The signal processing device of claim 1, wherein, The coupling unit comprises a reverse coupling port for coupling the part of the first signal and the second signal reflected by the first frequency selection unit to the second frequency selection unit.

3. The signal processing device according to claim 1 or 2, characterized in that, The coupling unit further comprises an isolation port for connecting a load.

4. The signal processing device according to any one of claims 1 to 3, characterized in that, The coupling unit further comprises a first input port for inputting the first signal and the second signal, and a first output port for outputting the first signal and the second signal.

5. The signal processing device according to any one of claims 1 to 4, characterized in that, The second frequency selection unit comprises a second input port for receiving the coupled part of the first signal and the second signal reflected by the first frequency selection unit, and a second output port for sending the second signal amplified to the digital channel for cancellation.

6. The signal processing device according to any one of claims 1 to 5, wherein, The amplitude of the first signal is X decibels milliwatts dBm, the amplitude of the second signal is Y dBm, the coupling coefficient of the coupling unit is C dBm, the reflection coefficient of the first frequency selection unit is R decibels dB, the amplitude of the part of the first signal coupled to the second frequency selection unit is (X-C-R) dBm, and the amplitude of the second signal coupled to the second frequency selection unit is (Y-C) dBm.

7. The signal processing device according to any one of claims 1 to 6, characterized by, The first signal and the second signal are amplified signals.

8. The signal processing device of any one of claims 1-7, wherein, The first signal is a transmit frequency band signal, and the second signal is a receive frequency band signal.

9. A signal processing method characterized by, The method is applied to a signal processing device comprising a first frequency selection unit, a coupling unit, and a second frequency selection unit, and the method comprises: the signal processing device filters a first signal through the first frequency selection unit and reflects part of the first signal to the coupling unit, and fully reflects a second signal through the first frequency selection unit to the coupling unit; the signal processing device couples the part of the first signal and the second signal reflected by the first frequency selection unit to the second frequency selection unit through the coupling unit; the signal processing device filters the second signal through the second frequency selection unit and sends the second signal to a digital channel for cancellation.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer programs or instructions, which, when executed on a communication device, cause the communication device to perform the method of claim 9.

11. A computer program product, characterised in that, The computer program product comprises computer programs or instructions for executing the method of claim 9. The computer program product comprises computer programs or instructions for executing the method of claim 9.

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