Signal processing device

Abstract

The invention provides a signal processing device which comprises a first frequency selection unit, a coupling unit and a second frequency selection unit. The first frequency selection unit can filter most of the first signals and reflect a small part of the first signals and all the second signals, and the coupling unit couples a small part of interference signals reflected by the first frequency selection unit and required signals to the frequency selection monitoring channel (the second frequency selection unit). The amplitude of the interference signal at the inlet of the frequency-selecting monitoring channel is reduced, so that nonlinear products can be reduced, the influence on the signal-to-noise ratio of the system is reduced, and the system requirement of the frequency-selecting monitoring channel is met.

Description

Technical Field

[0001] This application relates to the field of communication technology, and more specifically, to a signal processing apparatus. Background Technology

[0002] With the evolution of transceivers, reducing the number of duplexer cavities is a key direction for miniaturizing and reducing the cost of high-power frequency division duplex (FDD) remote radio unit (RRU) modules. Simultaneously, the reduced suppression due to cavity reduction places increasingly higher demands on the linearity and dynamics of the RF transceiver channels. Therefore, it is necessary to introduce a corresponding high-linearity, high-dynamic-range receiver frequency-selective monitoring channel for monitoring and cancellation. The desired monitored signal is coupled back to the receiver frequency-selective channel, and then sampled and cancelled by the digital section. Through this cancellation channel architecture, a significant reduction in the number of cavities in the metal cavity duplexer is achieved, lowering the out-of-band suppression specification and realizing the key goals of miniaturization and low cost of high-power RRUs.

[0003] Currently, the output signal of a signal amplifier contains both the useful signal to be monitored and out-of-band interference signals. For example, in FDD applications, the out-of-band interference signal is typically the transmitted signal (TX) in the transmission signal band, while the useful signal is the received signal (RX) in the receive signal band. Through a forward coupler in the subsequent stage of the signal amplifier, the output signal can be looped back to the frequency-selective monitoring channel. However, due to limitations in the coupling coefficient of the forward coupler and the signal-to-noise ratio requirements of the frequency-selective monitoring channel, the amplitude of the interference signal at the entrance of the frequency-selective monitoring channel is relatively large, for example, ≥1 dBm. However, due to the linearity and dynamic limitations of the current traditional architecture's frequency selective monitoring channel and key components (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 band, causing the signal-to-noise ratio (SNR) of the frequency selective monitoring channel to deteriorate drastically. This affects the system performance requirements after the number of RRU duplexer cavities is reduced, and therefore cannot support duplexer cavity reduction, thus failing to achieve the key requirements of miniaturization and low cost. Summary of the Invention

[0004] This application provides a signal processing device that can couple part of the interference signal reflected by the duplexer and the desired signal to the frequency selective monitoring network through reverse coupling, thereby reducing the amplitude of the interference signal at the entrance of the frequency selective monitoring channel, improving the dynamic capability and linearity capability of the frequency selective monitoring channel, and meeting the system requirements of the frequency selective monitoring channel.

[0005] In a first aspect, a signal processing apparatus is provided, comprising: a first frequency selection unit, configured to filter a first signal from a coupling unit and reflect a portion of the first signal to the coupling unit, and to perform total reflection of a second signal from the coupling unit to the coupling unit; the coupling unit, configured to couple the portion of the first signal reflected by the first frequency selection unit and the second signal 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.

[0006] In this technical solution, the first frequency selection unit can filter most of the first signal and reflect a small portion of the first signal and all of the second signal. The coupling unit couples the small portion of the interference signal reflected back by the first frequency selection unit and the desired signal to the frequency selection monitoring channel (second frequency selection unit), thereby reducing the amplitude of the interference signal at the entrance of the frequency selection monitoring channel. This reduces the nonlinear products and decreases the impact on the system signal-to-noise ratio, thus meeting the system requirements of the frequency selection monitoring channel.

[0007] In conjunction with the first aspect, in some implementations of the first aspect, the coupling unit includes a reverse coupling port for coupling the portion of the first signal and the second signal reflected by the first frequency selection unit to the second frequency selection unit.

[0008] In this technical solution, by utilizing the structural characteristics of the coupling unit, a small portion of the interference signal reflected by the duplexer and the desired signal are coupled to the frequency-selective monitoring channel through the reverse coupling end. This can be achieved based on the existing structure of the coupling unit, avoiding additional structural improvements.

[0009] In conjunction with the first aspect, in some implementations of the first aspect, the coupling unit further includes an isolation port for connecting a load.

[0010] In this technical solution, an external matching load is used to ensure that the coupling degree and directionality coefficient of the coupling unit are normal, thus ensuring that the coupling unit works normally.

[0011] In conjunction with the first aspect, in some implementations of the first aspect, the coupling unit further includes a first input port and a first output port, wherein the first input port is used to input the first signal and the second signal, and the first output port is used to output the first signal and the second signal.

[0012] In this technical solution, signal transmission is achieved through the original structure of the coupling unit.

[0013] In conjunction with the first aspect, in some implementations of the first aspect, the second frequency selection unit includes a second input port and a second output port. The second input port is used to receive the portion of the first signal and the second signal reflected by the coupled first frequency selection unit, and the second output port is used to amplify the second signal and send it to the digital channel for cancellation.

[0014] In this technical solution, the original structure of the second frequency selection unit does not need any modification and can be implemented based on the existing structure of the frequency selection monitoring channel, avoiding additional structural and layout improvements.

[0015] In conjunction with the first aspect, in some implementations of the first aspect, the amplitude of the first signal is X 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 portion of the first signal coupled to the second frequency selection unit is (XCR) dBm, and the amplitude of the second signal coupled to the second frequency selection unit is (YC) dBm.

[0016] In this technical solution, the amplitude of the first signal coupled to the second frequency selection unit is reduced (from (XC) dBm to (XCR) dBm), and the amplitude of the nonlinear product hitting the second signal band is also reduced (from (XCP) dBm to (XCRP) dBm), where P is the amplitude of the power value of the passive intermodulation (PIM) signal. Therefore, the impact on the system signal-to-noise ratio is reduced, which can meet the system requirements.

[0017] In conjunction with the first aspect, in some implementations of the first aspect, the first signal and the second signal are amplified signals.

[0018] In conjunction with the first aspect, in some implementations of the first aspect, the first signal is a transmitting frequency band signal and the second signal is a receiving frequency band signal.

[0019] Secondly, a signal processing method is provided, which is applied to a signal processing device including a first frequency selection unit, a coupling unit, and a second frequency selection unit. The method includes: the signal processing device filtering a first signal through the first frequency selection unit and reflecting a portion of the first signal to the coupling unit; the signal processing device performing total reflection of a second signal to the coupling unit through the first frequency selection unit; the signal processing device coupling the portion of the first signal reflected by the first frequency selection unit and the second signal to the second frequency selection unit through the coupling unit; and the signal processing device filtering the second signal through the second frequency selection unit and sending the second signal to a digital channel for cancellation.

[0020] In this technical solution, the signal processing device can filter most of the first signal through the first frequency selection unit, and reflect a small portion of the first signal and all of the second signal. Then, through the coupling unit, the small portion of the interference signal reflected back by the first frequency selection unit and the desired signal are coupled to the frequency selection monitoring channel (second frequency selection unit). This reduces the amplitude of the interference signal at the entrance of the frequency selection monitoring channel, thereby reducing the products of nonlinear products and reducing the impact on the system signal-to-noise ratio, thus meeting the system requirements of the frequency selection monitoring channel.

[0021] Thirdly, a computer-readable storage medium is provided that stores program code for execution by a device, the program code including methods provided in the second aspect above.

[0022] Fourthly, a computer program product containing instructions is provided, which, when run on a computer, causes the computer to perform the method provided in the second aspect above. Attached Figure Description

[0023] Figure 1 A schematic diagram of the internal circuitry of an electronic device provided in an embodiment of this application is shown.

[0024] Figure 2 A schematic diagram of a radio frequency communication system is shown.

[0025] Figure 3 A schematic diagram of a signal processing device 300 provided in an embodiment of this application is shown. Detailed Implementation

[0026] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0027] The embodiments described in this application are only some embodiments, not all embodiments. All other embodiments obtained by those skilled in the art based on the descriptions of the embodiments in this application without inventive effort are within the scope of protection claimed in this application.

[0028] This application can be applied to various communication systems, such as: Global System for Mobile Communication (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), General Packet Radio Service (GPRS), Long Term Evolution (LTE), LTE Frequency Division Duplex (FDD), LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX), New Radio (NR), Future Communication Systems, inter-satellite communication, and satellite communication. The antennas and / or antenna systems described in the embodiments of this application can also be applied to other communication systems, which will not be detailed here.

[0029] The electronic equipment products involved in this application are not limited to FDD base station products such as macro base stations, small base stations, pole-mounted micro base stations, and backpack base stations. The embodiments of this application do not limit this.

[0030] Figure 1 This is a circuit diagram of an electronic device provided in an embodiment of this application.

[0031] like Figure 1 As shown, the electronic device may include an application processor (AP), a baseband module, a digital-to-analog converter, a radio frequency module, and an antenna module.

[0032] An application processor can run an open operating system and various applications running on top of it, and is responsible for the overall system control. During signal transmission, the application processor can transmit digital signals, such as voice signals, to the baseband module.

[0033] The baseband module can be used to encode and modulate received digital signals. For example, in the process of transmitting electrical signals to the outside, the baseband module encodes and modulates them to make the information in the digital signal occupy less space and to resist interference and attenuation in the channel, thereby improving link performance.

[0034] A digital-to-analog converter (DAC) can be used to convert digital signals output from the baseband module into analog signals for processing by the radio frequency (RF) module. Alternatively, it can convert analog signals output from the RF module into digital signals for processing by the baseband module.

[0035] Radio frequency (RF) modules can be used to modulate the frequency of received electrical signals and amplify their power. For example, in the process of transmitting electrical signals to the outside world, the RF module modulates the analog signal from a low frequency to a specified high frequency band, making it an RF signal that can be transmitted through the air, and amplifies the power of the RF signal to meet communication requirements.

[0036] The antenna module can be used to transmit radio frequency signals processed by the radio frequency module to the outside, or to receive external electromagnetic wave signals and transmit them to the radio frequency module.

[0037] Currently, frequency division dual (FDD) bands are typically used in FDD communication modes. To achieve miniaturization and low cost of high-power FDD RRU modules, reducing the number of duplexer cavities is a key direction. However, reducing the number of duplexer cavities leads to a decrease in out-of-band noise suppression. Therefore, a frequency-selective monitoring channel is needed for monitoring and cancellation. The useful signal to be monitored is coupled back to the receiving frequency-selective channel, and then sampled and cancelled by the digital section. By constructing a cancellation channel architecture, the number of cavities in the metal cavity duplexer can be significantly reduced, lowering the out-of-band suppression specification and achieving the key goals of miniaturization and low cost of high-power RRUs.

[0038] Figure 2 A schematic diagram of a radio frequency communication system is shown.

[0039] like Figure 2 As shown, the radio frequency communication system includes a signal amplifier 210, a coupler 220, a duplexer 240, an antenna 250, and a frequency selective monitoring channel 230.

[0040] The signal amplifier 210 is used to amplify the power of the radio frequency signal. The radio frequency signal includes a TX band transmit signal (hereinafter referred to as TX signal) and an RX band receive 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.

[0041] For example, in an FDD scenario, the TX signal is generally an out-of-band interference signal with an amplitude of approximately 3x dBm to 5x dBm, while the RX signal is generally a useful signal with an amplitude of approximately -1x to -3x dBm / MHz.

[0042] It should be understood that in FDD scenarios, the output TX signal power of the signal amplifier is relatively high. Due to the inherent nonlinear effect of the signal amplifier, the amplitude of the noise signal generated outside the TX signal band is also relatively high. High-amplitude noise exists outside the TX carrier band. If the suppression of out-of-band noise in the duplexer is insufficient, the out-of-band noise will leak through the duplexer to the receiving channel, affecting the system's receiving sensitivity and thus the module's coverage. Furthermore, the out-of-band noise will leak into the environment through the duplexer and antenna, affecting the normal operating performance of other modules.

[0043] Coupler 220 is used to transmit signals or energy and ensure proper electrical isolation or matching. The coupler operates by connecting two transmission channels (e.g., ...) Figure 2 Channels a and b) are placed close enough that, through the design of their electrical lengths, one channel, due to its signal propagation characteristics, will conduct a portion of its energy to the other channel. Figure 2 In this process, the majority of the output signal of the signal amplifier 210 is transmitted to the antenna end through the input and output terminals of the coupler's channel a. A small portion of the signal energy is transmitted through coupling terminal 1 to the channel connected to coupling terminal 1 for transmission (e.g., ...). Figure 2 (Frequency selection monitoring channel 230 in the middle). Isolation terminal 2 ensures the normal coupling degree and directivity coefficient of coupler 220 through an external matching load, enabling coupler 220 to operate normally. Since coupler 220 is a passive device, coupling terminal 1 and isolation terminal 2 are reciprocal, with completely identical electrical parameters. Therefore, both coupling terminal 1 and isolation terminal 2 can be used to transmit signal energy to the target channel. When coupling terminal 1 is used for signal transmission, it is generally called forward coupling; when isolation terminal 2 is used for signal transmission, it is called reverse coupling.

[0044] In this application, when coupling terminal 1 is used for signal transmission, coupling terminal 1 can also be called forward coupling terminal; when isolation terminal 2 is used for signal transmission, isolation terminal 2 can also be called reverse coupling terminal. This application does not limit the use of these terms in its embodiments.

[0045] In this embodiment, the coupler can be a device coupler or a microstrip coupler. The coupler can be coupled with a duplexer or set independently. The coupler can also be packaged with a frequency selective monitoring channel into a chip. This embodiment does not limit this.

[0046] Among them, the frequency selective monitoring channel 230 is used to filter out interference signals and sample and cancel useful signals by the digital part.

[0047] like Figure 2 As shown, a portion of the TX and RX signals are coupled to coupling terminal 1 via a coupler, and then enter the frequency-selective monitoring channel 230 from coupling terminal 1. The RX filter 231 in the frequency-selective monitoring channel 230 filters the interference signal (TX signal) to reduce its impact on the monitoring channel. Then, the RX signal is amplified by amplifier 232 and enters the digital channel 233, where the monitoring signal (RX signal) is canceled.

[0048] The duplexer 240 is a bidirectional filtering device. It isolates the transmitted and received signals, ensuring that both transmission and reception can function simultaneously. Transmitted and received signals can be separated using physical or electronic methods, thus preventing mutual interference.

[0049] A duplexer operates on the principle of signal separation. In wireless communication systems, a duplexer allows a device to simultaneously transmit and receive signals on a single channel. It uses filters to distinguish the frequency ranges of the input and output signals, ensuring that the transmitted and received signals do not interfere with each other. In FDD (Frequency Directional Duplex) mode, the duplexer uses two different frequency bands, one for transmitting and the other for receiving, allowing the device to transmit and receive signals simultaneously.

[0050] like Figure 2 As shown, the TX and RX signals enter the duplexer 240 through channel a of coupler 220. The TX signal is transmitted through duplexer 240 to antenna 250 for radiation, providing cell coverage. The RX signal is reflected back to coupler 220 through duplexer.

[0051] For example, the desired signal (including out-of-band interference signals) is looped back to the frequency selective monitoring channel 230 through coupling terminal 1 of coupler 220 after signal amplifier 210. The amplitude of the TX signal output by signal amplifier 210 is X dBm, the amplitude of the RX signal output by signal amplifier 210 is Y dBm, the coupling coefficient of coupler 220 is C dBm, the amplitude of the TX signal coupled to the input port of frequency selective monitoring channel 230 at coupling terminal 1 is (XC) dBm, and the amplitude of the RX signal coupled to the input port of frequency selective monitoring channel 230 at coupling terminal 1 is (YC) dBm. The TX signal, as an interference signal, generates nonlinear products (amplitude: (XCP) dBm) after entering the frequency selective monitoring channel. These nonlinear products strike within the RX signal band and enter the digital channel 233.

[0052] Currently, the output signals (RX and TX signals) can be looped back to the frequency-selective monitoring channel via the forward coupling terminal of the coupler after the signal amplifier stage. However, due to limitations in the forward coupling coefficient and the signal-to-noise ratio (SNR) requirements of the frequency-selective monitoring channel, the amplitude of the interference signal (TX signal) at the entrance of the frequency-selective monitoring channel is relatively large. For example, (XC) dBm ≥ 1x dBm. This excessively large interference signal amplitude leads to an increase in the amplitude of the nonlinear products generated after the interference signal enters the frequency-selective monitoring channel. These nonlinear products can hit the useful signal band, causing a drastic deterioration in the SNR of the frequency-selective monitoring channel. For example, the system SNR deterioration may exceed 20 dB, affecting the system performance requirements after reducing the number of RRU duplexer cavities. Therefore, it cannot support duplexer cavity reduction and fails to meet the key requirements of miniaturization and low cost.

[0053] In summary, this application proposes a signal processing device and a signal processing system that can couple a small portion of the interference signal reflected by the duplexer and the desired signal to the frequency selective monitoring channel through the reverse coupling terminal. This reduces the amplitude of the interference signal at the entrance of the frequency selective monitoring channel, reduces nonlinear products, reduces the impact on the system signal-to-noise ratio, and meets the system requirements of the frequency selective monitoring channel.

[0054] The following is a detailed description of a signal processing apparatus provided in the embodiments of this application.

[0055] See Figure 3 As an example, Figure 3 A schematic diagram of a signal processing device 300 provided in an embodiment of this application is shown.

[0056] like Figure 3 As shown, the signal processing device 300 includes a coupling unit 320, a second frequency selection unit 330, and a first frequency selection unit 340.

[0057] For example, the first frequency selection unit 340 can be a duplexer, such as a... Figure 2 The duplexer 240 is shown in the figure.

[0058] For example, the coupling unit 320 can be a coupler; for instance, the coupling unit 320 is... Figure 2 Coupler 220 is shown in the figure.

[0059] For example, the second frequency selection unit 330 can be a frequency selection monitoring channel, such as a frequency selection unit 330 being... Figure 2 The frequency selection monitoring channel 230 is shown in the figure.

[0060] The structure will be described in detail below.

[0061] The first frequency selection unit 340 is used to filter the first signal from the coupling unit 320 and reflect part of the first signal to the coupling unit 320, and to perform total reflection of the second signal from the coupling unit 320 to the coupling unit 320.

[0062] For example, the first signal and the second signal are amplified signals.

[0063] Optionally, the structure also includes a first amplification unit 310, for example, the first amplification unit 310 is... Figure 2 The signal amplifier 210 is shown in the figure.

[0064] The first amplification unit 310 sends the amplified signals (first signal and second signal) to the coupling unit 320.

[0065] The coupling unit 320 includes channel a and channel b. Channel a includes a first input port and a first output port. The first input port is used to input a first signal and a second signal, and the first output port is used to output the first signal and the second signal.

[0066] Correspondingly, the first frequency selection unit 340 receives the first signal and the second signal from the first output port.

[0067] The first and second signals will be reflected by 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... Figure 3 The antenna 350 shown in the diagram reflects a portion of the first signal to the coupling unit 320. The first frequency selection unit 340 performs total reflection of the second signal, meaning that the entire second signal can be reflected to the coupling unit 320.

[0068] It is understandable that since the first frequency selection unit 340 and the antenna 350 are in a matched 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.

[0069] For example, the reflection coefficient of the first frequency selection unit 340 for the first signal is -1 dB, and the reflection coefficient of the first frequency selection unit 340 for the second signal is 0 dB.

[0070] The coupling unit 320 is used to couple the portion of the first signal and the second signal reflected by the first frequency selection unit 340 to the second frequency selection unit 330.

[0071] In one possible implementation, the coupling unit 320 includes a reverse coupling port 2 for coupling the portion of the first signal and the second signal reflected by the first frequency selection unit 340 to the second frequency selection unit 330.

[0072] For example, a portion of the first signal and the second signal are reflected by the first frequency selection unit 340 to the coupling unit 320, coupled at the reverse coupling port 2 of the coupling unit 320, and enter the second frequency selection unit 330.

[0073] It should be noted that 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.

[0074] For example, the amplitude of the first signal coupled at the reverse coupling port 2 is reduced to more than 1xdB.

[0075] For example, the interference signal entering the second frequency selection unit 330 is significantly reduced, and the dynamic capability of the second frequency selection unit 330 can be improved by more than 1xdB.

[0076] In one possible implementation, the coupling unit 320 further includes an isolation port 1 for connecting a load.

[0077] It is understandable that by connecting an external matching load, the coupling degree and directivity coefficient of the coupling unit 320 are ensured to be normal, so that the coupling unit 320 can work normally.

[0078] The second frequency selection unit 330 is used to filter the second signal and send it to the digital channel 333 for cancellation.

[0079] 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 a portion of the first signal and the second signal reflected by the coupled first frequency selection unit 340. The second output port 4 is used to amplify the second signal and send it to the digital channel 333 for cancellation.

[0080] In this process, a portion of the first signal and the second signal enter the second frequency selection unit 330 through the second input port 3. The filter 331 in the second frequency selection unit 330 filters out a portion of the first signal. That is, the second signal passes through the filter 331 and enters the digital channel 333 through the second output port 4 for cancellation.

[0081] Optionally, the second frequency selection unit 330 may also include an amplifier 332, and the second signal, after being amplified, enters the digital channel 333 through the second output port 4 for cancellation.

[0082] It can be understood that filter 331 is the second signal filter.

[0083] It should be noted that if the amplitude of the first signal entering the second frequency selection unit 330 is significantly reduced, the amplitude of the generated nonlinear products will also be reduced. Even if the nonlinear products hit the second signal band, their impact will be reduced, for example, the impact on the system signal-to-noise ratio will be reduced.

[0084] For example, since the interference signal entering the second frequency selection unit 330 is significantly reduced, based on the 1:2 relationship between the interference signal amplitude and the nonlinear products, the amplitude of the nonlinear intermodulation products generated by the interference signal is reduced by more than 2xdB. The overall linearity capability is improved by more than 3xdB.

[0085] The following is an exemplary description of the operation method of the signal processing device.

[0086] For example, the first amplification unit 310 outputs amplified first and second signals, which then enter the first frequency selection unit 340 through channel a in the subsequent coupling unit 320. The first signal is radiated to the antenna 350 through the first frequency selection unit 340, and a portion (a small amount) of the first signal can be reflected back to the coupling unit 320, while the second signal can be totally reflected back to the coupling unit 320. The desired signal (including out-of-band interference signals) is looped back to the second frequency selection unit 330 through the reverse coupling terminal 2 of the coupling unit 320. A portion of the first signal entering the second frequency selection unit 330 is filtered out by filter 331, and the second signal passes through filter 331 and enters the digital channel 333 for cancellation.

[0087] The amplitude of the first signal output by the first amplification unit 310 is X dBm, the amplitude of the second signal output by the first amplification unit 310 is Y dBm, the coupling coefficient of the coupling unit 320 is C dBm, the return loss (RL) of the first frequency selection unit is R dB, the amplitude of the first signal coupled from the reverse coupling terminal 2 to the second input port 3 of the second frequency selection unit 330 is (XCR) dBm, and the amplitude of the second signal coupled from the reverse coupling terminal 2 to the second input port 3 of the second frequency selection unit 330 is (YC) dBm. The first signal, as an interference signal, will generate nonlinear products (amplitude: (XCRP) dBm) after entering the second frequency selection unit 330, where P is the amplitude of the power value of the passive intermodulation (PIM) signal. The nonlinear products will hit the second signal band and enter the digital channel 333.

[0088] It should be noted that filter 331 can filter out signals outside the band of the monitored signal (second signal), that is, filter 331 can filter out the first signal. Nonlinear products will hit within the band of the second signal, that is, filter 331 cannot filter out the nonlinear products generated by the first signal.

[0089] As mentioned above, the amplitude of the first signal coupled to the second frequency selection unit 330 through the reverse coupling port 2 is reduced (from (XC) dBm to (XC-R dBm), and the amplitude of the nonlinear product hitting the second signal band is also reduced (from (XCP) dBm to (XCRP) dBm). Therefore, the impact on the system signal-to-noise ratio is reduced, which can meet the system requirements.

[0090] It should be understood that since the first signal is sufficiently low, the nonlinear products it generates in the second frequency selection unit 330 are also sufficiently low, and their impact on the signal-to-noise ratio of the second frequency selection unit 330 is negligible. This minimizes its influence on the second frequency selection unit 330, and then, through the digital channel 333, the monitored signal (second signal) is canceled by an algorithm. After cancellation, the noise output from the second frequency selection unit 340 and the antenna 350 is reduced to an ideal level, causing no interference to itself or the external environment.

[0091] Based on the above technical solution, in this embodiment of the application, the interference signal reflected by the duplexer and the desired signal are coupled to the frequency selective monitoring network by reverse coupling, which reduces the amplitude of the interference signal at the entrance of the frequency selective monitoring channel, improves the dynamic capability and linear capability of the frequency selective monitoring channel, and meets the system requirements of the frequency selective monitoring channel.

[0092] In one possible implementation, embodiments of this application can improve the dynamic capability and linearity of the frequency selective monitoring channel, reduce the suppression of the metal cavity duplexer, and decrease the size and weight of the base station, thus achieving key evolution goals.

[0093] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented 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 this application.

[0094] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0095] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0096] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0097] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0098] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0099] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A signal processing apparatus, characterized in that, include: The first frequency selection unit is used to filter the first signal from the coupling unit and reflect part of the first signal to the coupling unit, and to perform total reflection of the second signal from the coupling unit to the coupling unit. The coupling unit is used to couple the portion of the first signal and the second signal reflected by the first frequency selection unit to the second frequency selection unit; The second frequency selection unit is used to filter the second signal and send the second signal to the digital channel for cancellation.

2. The signal processing apparatus according to claim 1, characterized in that, The coupling unit includes a reverse coupling port, which is used to couple the portion 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 apparatus according to claim 1 or 2, characterized in that, The coupling unit also includes an isolation port for connecting a load.

4. The signal processing apparatus according to any one of claims 1-3, characterized in that, The coupling unit further includes a first input port and a first output port, wherein the first input port is used to input the first signal and the second signal, and the first output port is used to output the first signal and the second signal.

5. The signal processing apparatus according to any one of claims 1-4, characterized in that, The second frequency selection unit includes a second input port and a second output port. The second input port is used to receive the portion of the first signal and the second signal reflected by the coupled first frequency selection unit. The second output port is used to amplify the second signal and send it to the digital channel for cancellation.

6. The signal processing apparatus according to any one of claims 1-5, characterized in that, The amplitude of the first signal is X 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 dB, the amplitude of the portion of the first signal coupled to the second frequency selection unit is (XCR) dBm, and the amplitude of the second signal coupled to the second frequency selection unit is (YC) dBm.

7. The signal processing apparatus according to any one of claims 1-6, characterized in that, The first signal and the second signal are amplified signals.

8. The signal processing apparatus according to any one of claims 1-7, characterized in that, The first signal is a transmitting frequency band signal, and the second signal is a receiving frequency band signal.

9. A signal processing method, characterized in that, The method is applied to a signal processing device, the signal processing device including a first frequency selection unit, a coupling unit, and a second frequency selection unit, the method comprising: The signal processing device filters the first signal through the first frequency selection unit and reflects part of the first signal to the coupling unit, and performs total reflection of the second signal to the coupling unit through the first frequency selection unit; The signal processing device couples a portion 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 the digital channel for cancellation.

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

11. A computer program product, characterized in that, The computer program product includes a computer program or instructions for performing the method as described in claim 9.

Images