WO2022205017A1 - 一种信号处理方法及通信装置 - Google Patents

一种信号处理方法及通信装置 Download PDF

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Publication number
WO2022205017A1
WO2022205017A1 PCT/CN2021/084182 CN2021084182W WO2022205017A1 WO 2022205017 A1 WO2022205017 A1 WO 2022205017A1 CN 2021084182 W CN2021084182 W CN 2021084182W WO 2022205017 A1 WO2022205017 A1 WO 2022205017A1
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WIPO (PCT)
Prior art keywords
signal
carrier signal
clipping
carrier
noise power
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PCT/CN2021/084182
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English (en)
French (fr)
Inventor
邹志强
高亚楠
陈曦
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP21933697.1A priority Critical patent/EP4307571A4/en
Priority to CN202180096502.7A priority patent/CN117178488A/zh
Priority to PCT/CN2021/084182 priority patent/WO2022205017A1/zh
Publication of WO2022205017A1 publication Critical patent/WO2022205017A1/zh
Priority to US18/476,059 priority patent/US20240022463A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H04L27/2623—Reduction thereof by clipping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0475—Circuits with means for limiting noise, interference or distortion

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a signal processing method and a communication device.
  • each carrier is orthogonal to each other, so that each carrier can have an integer number of carrier periods within a symbol time, and the spectral nulls of each carrier overlap with the nulls of adjacent carriers. , which reduces the interference between carriers.
  • OFDM symbol is formed by the superposition of multiple independently modulated carrier signals. When the phases of each carrier are the same or similar, the superimposed signal will be modulated by the same initial phase signal, resulting in a large instantaneous power peak, which further brings higher peak to average power ratio (PAPR).
  • PAPR peak to average power ratio
  • the dynamic range of the power amplifier is limited, and the OFDM signal with large PAPR is easy to enter the nonlinear region of the power amplifier, resulting in nonlinear distortion of the signal, resulting in obvious spectrum spread interference and in-band signal distortion, resulting in a serious degradation of the overall system performance.
  • the present application provides a signal processing method and a communication device, through which the PAPR in the OFDM system can be reduced, thereby reducing the nonlinear distortion of the signal and improving the system performance.
  • the present application provides a signal processing method, the method comprising: if it is detected that at least one of the signal characteristics of each carrier signal in the first combined signal changes, determining each carrier signal based on the signal characteristics of each carrier signal. the first clipping noise power corresponding to the carrier signal; each carrier signal is clipped based on the first clipping noise power corresponding to each carrier signal; wherein, the signal characteristics include power, bandwidth, frequency, power spectral density or modulation mode one or more of.
  • the PAPR in the OFDM system is reduced by clipping each carrier signal, and when the signal characteristics of each carrier signal change, the access network device can The signal characteristics determine the clipping noise power of each carrier signal, so that the clipping noise power is dynamically adapted to each carrier signal, so as to avoid missing clipping and improve the robustness of the system power amplifier.
  • the clipping weight corresponding to each carrier signal is determined based on the signal characteristics of each carrier signal in the first combined signal; the first clipping weight corresponding to each carrier signal is determined based on the clipping weight corresponding to each carrier signal Clipping noise power.
  • the signal characteristic of the carrier signal affects the clipping weight of the carrier signal, which in turn affects the clipping noise power of the carrier signal, that is, it can be understood that the clipping noise power of the carrier signal matches the signal characteristic of the carrier signal , so as to avoid undercutting.
  • the second clipping noise power corresponding to each carrier signal is determined based on the preset signal threshold of the first combined signal; based on the second clipping noise power corresponding to each carrier signal and the power to determine the clipping weight corresponding to each carrier signal.
  • the first combined signal is clipped to obtain the second combined signal; the second combined signal is decomposed to obtain the second combined signal.
  • Nonlinear part; Taylor expansion and Fourier transform are performed on the nonlinear part of the second combined signal to obtain the power spectral density of the nonlinear part; the power spectral density of the nonlinear part is calculated based on the frequency point and bandwidth of each carrier signal Integrate to obtain the second clipping noise power corresponding to each carrier signal.
  • the unweighted clipping noise power (which can be understood as the original clipping noise power) corresponding to the carrier signal is jointly determined in combination with multiple signal characteristics of the carrier signal, and the determined unweighted clipping noise power can be improved. accuracy.
  • the first clipping noise power corresponding to each carrier signal is determined based on the second clipping noise power of each carrier signal and the clipping weight corresponding to each carrier signal.
  • the clipping noise power of the carrier signal is jointly determined by the aforementioned original clipping noise power and clipping weight, which can improve the accuracy of the clipping noise power of the carrier signal and the relationship between the clipping noise power and the carrier signal. suitability.
  • the signal characteristic includes a modulation mode
  • the signal characteristic also includes one or more of power, bandwidth, frequency, or power spectral density, based on the first combined signal of each carrier signal in the first combined signal.
  • a signal feature determining the clipping weight corresponding to each carrier signal, the first signal feature is one or more of power, bandwidth, frequency or power spectral density; based on the modulation mode of each carrier signal, update the corresponding where the updated clipping weight of each carrier is negatively correlated with the modulation order of the modulation mode of each carrier signal.
  • the clipping weight can also be adjusted according to the modulation mode of the carrier signal, so that the access network equipment While ensuring the adaptability between the clipping noise power and the carrier signal, the demodulation performance of the high-order modulated carrier is improved.
  • the signal characteristic includes a modulation mode, and the clipping weight of the first carrier signal and the clipping weight of the second carrier signal are determined; wherein the clipping weight of the first carrier signal is smaller than the clipping weight of the second carrier signal Weight, the modulation mode of the first carrier signal is the first modulation mode, the modulation mode of the second carrier signal is the second modulation mode, and the modulation order of the first modulation mode is higher than the modulation order of the second modulation mode.
  • the access network device determines the clipping weight of the carrier signal according to the modulation method of the carrier signal, so that the clipping of the carrier signal of the high-order modulation method is smaller, thereby improving the demodulation performance of the high-order modulated carrier. .
  • a communication apparatus in a second aspect, may be a first communication device, a device in the first communication device, or a device that can be matched and used with the first communication device.
  • the communication device may also be a chip system.
  • the communication device may perform the method described in the first aspect.
  • the functions of the communication device may be implemented by hardware, or by executing corresponding software by hardware.
  • the hardware or software includes one or more units corresponding to the above-mentioned functions.
  • the unit may be software and/or hardware.
  • the present application provides a communication apparatus, the communication apparatus includes a processor, and when the processor calls a computer program in a memory, the method performed by the first communication device in the method of the first aspect is executed by the processor. implement.
  • the present application provides a communication device, the communication device includes a processor and a memory, the memory is used for storing computer-executable instructions; the processor is used for executing the computer-executable instructions stored in the memory, so that the The communication apparatus executes the method executed by the first communication device in the method described in the first aspect.
  • the present application provides a communication device, the communication device includes a processor, a memory, and a transceiver, the transceiver is used for receiving a signal or sending a signal; the memory is used for storing a computer program; the A processor for invoking the computer program from the memory to perform the method performed by the first communication device in the method described in the first aspect.
  • the present application provides a communication device, the communication device includes a processor and an interface circuit, the interface circuit is configured to receive computer execution instructions and transmit them to the processor; the processor runs the computer The instructions are executed to perform the method performed by the first communication device in the method of the first aspect.
  • the present application provides a computer-readable storage medium, where the computer-readable storage medium is used to store computer-executable instructions, when the computer-executable instructions are executed, the first method in the method according to the first aspect is executed.
  • a method performed by a communication device is implemented.
  • the present application provides a computer program product comprising a computer program, which, when executed, enables the method performed by the first communication device in the method described in the first aspect to be implemented.
  • the present application provides a communication system, where the communication system includes the communication apparatus described in the second aspect, the third aspect, the fourth aspect, the fifth aspect or the sixth aspect.
  • FIG. 1 is a schematic diagram of an application scenario of the signal processing method provided by the present application.
  • FIG. 2 is a schematic flowchart of a signal processing method provided by the present application.
  • 3a is a schematic diagram of a time domain signal diagram of a combined signal S provided by the application.
  • 3b is a schematic diagram of a frequency domain signal diagram of a combined signal S provided by the application.
  • FIG. 4 is a schematic diagram of clipping a carrier signal provided by the application.
  • FIG. 5 is a schematic flowchart of a method for determining the first clipping noise power corresponding to each carrier provided by the present application
  • 6a is a schematic diagram of an application scenario of the signal processing method provided by the present application.
  • 6b is a schematic diagram of another application scenario of the signal processing method provided by the present application.
  • 6c is a schematic diagram of another application scenario of the signal processing method provided by the present application.
  • FIG. 7 is a schematic structural diagram of a communication device provided by the present application.
  • FIG. 8 is a schematic structural diagram of another communication apparatus according to an embodiment of the present application.
  • At least one (item) means one or more
  • plural means two or more
  • at least two (item) means two or three and three
  • “and/or” is used to describe the corresponding relationship between corresponding objects, indicating that there can be three kinds of relationships, for example, “A and/or B” can mean: only A exists, only B exists, and both A and B exist three A case where A and B can be singular or plural.
  • the character “/” generally indicates that the corresponding object before and after is an "or” relationship.
  • At least one item(s) below” or similar expressions thereof refer to any combination of these items, including any combination of single item(s) or plural item(s).
  • At least one (a) of a, b or c can mean: a, b, c, "a and b", “a and c", “b and c", or "a and b and c" ", where a, b, c can be single or multiple.
  • the methods provided in the embodiments of the present application can be applied to various communication systems, for example, an internet of things (internet of things, IoT) system, a narrow band internet of things (NB-IoT) system, a long-term evolution ( long term evolution, LTE) system, it can also be a fifth-generation (5th-generation, 5G) communication system, it can also be a hybrid architecture of LTE and 5G, it can also be a 5G new radio (NR) system, and future communications New communication systems emerging in development, etc.
  • IoT internet of things
  • NB-IoT narrow band internet of things
  • LTE long-term evolution
  • 5G fifth-generation
  • 5G fifth-generation
  • NR 5G new radio
  • FIG. 1 is a schematic diagram of an application scenario of the signal processing method provided by the present application.
  • user equipment (user equipment, UE) 1 , UE2 and UE3 belong to the serving cell 11
  • UE4 , UE5 and UE6 belong to the serving cell 12 .
  • the access network device ((radio) access network, (R)AN) 10 transmits data to the UE in the serving cell 11 through the carrier signal 1, and transmits data to the UE in the serving cell 12 through the carrier signal 2.
  • the carrier signal 1 and the carrier signal 2 share the same radio frequency channel, that is, in the radio frequency channel, the carrier signal 1 and the carrier signal form a combined signal (it can be understood that the combined signal includes the carrier signal 1 and the carrier signal 2).
  • the access network device mentioned in this application is an entity on the network side used to transmit or receive signals, that is, a node or device that accesses a terminal device to a wireless network.
  • An access network device such as Including but not limited to: new generation base station (generation node B, gNB), evolved node B (evolved node B, eNB), next generation evolved node B (next generation eNB, ng-eNB) in 5G communication system, wireless Backhaul equipment, radio network controller (RNC), node B (node B, NB), base station controller (BSC), base transceiver station (base transceiver station, BTS), home base station ( (home evolved nodeB, HeNB) or (home node B, HNB)), remote radio unit (RRU), baseband unit (baseBand unit, BBU), transmitting and receiving point (transmitting and receiving point, TRP), Transmission point (transmitting point, TP), mobile switching center, etc.
  • This application only takes an access network device including
  • Peak to average power ratio refers to the ratio of peak power to average power, where peak power can be understood as the instantaneous maximum output power of the signal, and average power is the average power of the signal.
  • a clipping threshold (also called a preset signal threshold hereinafter) is set on the signal to suppress the peak value of the original signal.
  • the clipping threshold can be understood as a clipping amplitude threshold or a clipping power threshold.
  • the difference between the original signal and the clipping threshold is called the clipping noise power, that is, it can be understood that the clipping noise power is the part of the original signal that is cut by the clipping threshold.
  • a clipping algorithm can be designed on the intermediate frequency side of the transmitter to reduce the peak amplitude of the original signal, thereby reducing the PAPR in the OFDM system.
  • the principle of using the clipping algorithm to reduce PAPR is: when the modulus value of the carrier signal (ie the signal amplitude value) is greater than the preset modulus value threshold, then the modulus value of the carrier signal is updated to the preset modulus value threshold ; When the modulo value of the carrier signal is less than the preset modulo value threshold, the modulo value of the carrier signal remains unchanged.
  • the present application provides a signal processing method, which determines the clipping noise power of each carrier signal according to the current signal characteristics of each carrier signal, so that the determined clipping noise power and the carrier signal are dynamically adapted, thereby While reducing the PAPR of the OPDM system, the leakage clipping is avoided, and the robustness of the system power amplifier is improved.
  • FIG. 2 is a schematic flowchart of a signal processing method provided by the present application.
  • the signal processing method includes the following S201-S202.
  • the execution subject of the method shown in FIG. 2 may be an access network device, or the execution subject may be a chip of the access network device.
  • FIG. 2 takes the access network device as the execution subject of the method as an example for description.
  • the execution subjects of the signal processing methods shown in other drawings in the embodiments of the present application are the same, and will not be repeated hereafter. in:
  • the first combined signal is the original combined signal sent by the access network device, which can be understood as an unclipped signal and is composed of multiple carrier signals (or can be understood as the combined signal includes multiple carrier signals).
  • the combined signal S includes two carrier signals: carrier signal S1 and carrier signal S2.
  • the combined signal is decomposed from the time domain and frequency domain: please refer to Fig. 3a, Fig. 3a is the time domain signal diagram of the combined signal S, wherein the curve 31 is the carrier signal S1, and the curve 32 is the carrier signal S2; Referring to FIG. 3b, FIG. 3b is a frequency domain signal diagram of the combined signal S, wherein the area 33 is the carrier signal S1, and the area 34 is the carrier signal S2.
  • the access network device detects the signal characteristic of each carrier signal in the first combined signal, and if it detects that the signal characteristic of any one of the carrier signals in the first combined signal changes, the access network device based on the combined signal
  • the signal characteristic of each carrier signal in the signal determines that each carrier signal corresponds to the first clipping noise power. It should be known that the manner in which the access network device detects the signal characteristics of each carrier signal in the first combined signal may be continuously detected, or may be detected periodically according to a time value, which is not specifically limited in this application. .
  • the first combined signal S includes a carrier signal S1 and a carrier signal S2, and the access network device detects the signal characteristic of the carrier signal S1 and the signal characteristic of the carrier signal S2.
  • the signal characteristics of the carrier signal S1 include: power P1, bandwidth D1, frequency H1, power spectral density R1 and modulation mode Q1, the signal of the carrier signal S2
  • the features include: power P2, bandwidth D2, frequency H2, power spectral density R2, and modulation mode Q2.
  • the access network device determines the first value of the carrier signal S1 according to the signal characteristics of the carrier signal S1 and the signal characteristics of the carrier signal S2.
  • the clipping noise power is N1, and the first clipping noise power of the carrier signal S2 is N2.
  • the access network device detects that the power spectral density of the carrier signal S1 is changed from the power spectral density R1 to the power spectral density R1'.
  • the access network equipment can use the signal characteristics of the carrier signal S1 (ie power P1, bandwidth D1, frequency point H1, power spectral density R1' and modulation mode Q1) and the signal characteristics of the carrier signal S2, namely (power P2 , bandwidth D2, frequency point H2, power spectral density R2 and modulation mode Q2) to determine the first clipping noise power N1' corresponding to the carrier signal S1 and the second clipping noise power N2' corresponding to the carrier signal S2.
  • the signal characteristics of the carrier signal S1 ie power P1, bandwidth D1, frequency point H1, power spectral density R1' and modulation mode Q1
  • the signal characteristics of the carrier signal S2 namely (power P2 , bandwidth D2, frequency point H2, power spectral density R2 and modulation mode Q2)
  • the access network device clips the carrier signal based on the first clipping noise power corresponding to the carrier signal.
  • the first clipping noise power corresponding to the carrier signal S1 is N1
  • FIG. 4 is a schematic diagram of clipping the carrier signal provided by the present application.
  • the module 41 is the carrier signal S1 before clipping
  • the module 42 is the carrier signal S1 after clipping according to the first clipping noise power N1.
  • clipping each carrier signal by the clipping noise power of each carrier signal can effectively reduce the PAPR in the system and improve the system performance.
  • the signal characteristics of the carrier signal at the current moment determine the clipping noise power of each carrier signal, that is, if any signal characteristic of the carrier signal changes, the clipping noise power of each carrier signal will also change, so that the clipping noise of the carrier signal will change.
  • the adaptation between the wave noise power and the carrier signal avoids missing clipping and improves the robustness of the system power amplifier.
  • FIG. 5 is a schematic flowchart of a method for determining the first clipping noise power corresponding to each carrier provided by the present application.
  • the method for determining the first clipping noise power corresponding to each carrier includes the following S501-S502.
  • the execution subject of the method shown in FIG. 5 may be an access network device, or the execution subject may be a chip of the access network device.
  • FIG. 5 takes the access network device as the execution subject of the method as an example for description. in:
  • the clipping weight corresponding to each carrier signal is determined according to the signal characteristics of each carrier signal, and the manner of determining the clipping weight of each carrier signal is slightly different for the diversity of signal characteristic combinations.
  • the method for determining the clipping weight of each carrier signal will be described in detail below based on the diversity of signal feature combinations.
  • the signal characteristics include one or more of power, bandwidth, frequency, or power spectral density.
  • the access network device determines the second clipping noise power corresponding to each carrier signal based on the preset signal threshold of the first combined signal, and further, the access network device determines the second clipping noise power corresponding to each carrier signal based on the second The clipping noise power and the power of each carrier signal determine the clipping weight corresponding to each carrier signal.
  • the preset signal threshold can be adjusted correspondingly according to specific application scenarios, and the specific value of the preset signal threshold is not specifically limited in this application.
  • the access network device determines the second clipping noise power corresponding to each carrier signal based on the preset signal threshold of the first combined signal. Further, the access network device may determine the clipping weight corresponding to each carrier signal based on the ratio between the powers of each carrier signal and the ratio between the second clipping noise powers corresponding to each carrier signal.
  • the first combined signal includes a carrier signal S1 and a carrier signal S2, wherein the power of the carrier signal S1 is P1 and the second clipping noise N1 of the carrier signal S1, the power of the carrier signal S2 is P2 and the carrier signal S1 The second clipping noise N2.
  • the ratio between P1 and P2 is 10:1, and the ratio between N1 and N2 is 5:1, in this case, in order to ensure the same degree of deterioration of each carrier signal, even if each power of the carrier signal S1 corresponds to The clipping noise power is the same as the clipping noise power corresponding to each power in the carrier signal S2, and the ratio between the clipping weight W1 corresponding to the carrier signal S1 and the clipping weight W2 corresponding to the carrier signal S2 is determined to be 2: 1. In other words, in order to ensure the same degree of deterioration of each carrier signal, the ratio of the product of the second clipping noise power corresponding to each carrier signal and the clipping weight should be the same as the ratio of the power of each carrier signal.
  • the access network device Based on the preset signal threshold of the first combined signal, the access network device clips the first combined signal to obtain a second combined signal, and decomposes the second combined signal to obtain a non-reactive signal of the second combined signal.
  • the linear part as shown in Equation (1).
  • S 0 (t) is the second combined signal, that is, the output signal of the first combined signal S after being clipped by a preset signal threshold.
  • ⁇ .S(t) is the decomposed linear part of the second combined signal S 0 (t)
  • n d (t) is the decomposed nonlinear part of the second combined signal S 0 (t).
  • the access network device performs Taylor expansion on the nonlinear part of the second combined signal, that is, it can be understood as performing Taylor expansion on the autocorrelation function of the second combined signal. Specifically, an autocorrelation function is obtained for the second combined signal, and Taylor expansion is performed, as shown in formula (2).
  • the power spectral density of the nonlinear part is integrated based on the frequency point and bandwidth of each carrier signal to obtain the second clipping noise power corresponding to each carrier signal.
  • the first combined signal S includes a carrier signal S1 and a carrier signal S2.
  • the access network device is based on the frequency point H1 of the carrier signal S1 and the bandwidth D1 to formula (3). Integrate to obtain the second clipping noise power corresponding to the carrier signal S1; the access network device is based on the frequency point H2 of the carrier signal S2 and the bandwidth D2 to formula (3) Integrate to obtain the second clipping noise power corresponding to the carrier signal S2.
  • FIG. 6a is an application scenario of the signal processing method provided by the present application.
  • the combined signal includes two carrier signals: a carrier signal F1 (with a power of P1) and a carrier signal F2 (with a power of P2).
  • the carrier signal F2 lends a part of the power to the carrier signal F1 for use, thereby
  • the ratio between the power of the carrier signal F1 (which becomes P2', which is smaller than P2) and the power of the carrier signal F2 (which becomes P1', which is greater than P1) changes.
  • the method described in Implementation 1 can be used to determine the clipping weight of each carrier signal according to the signal characteristics of each current carrier signal.
  • FIG. 6b is another application scenario of the signal processing method provided by the present application.
  • the combined signal includes two carrier signals: a carrier signal F1 (with a power of P1) and a carrier signal F2 (with a power of P2), in order to improve the signal coverage of the carrier signal F1, the access network equipment lends some unscheduled resource blocks (RBs) in the carrier signal F1 to other RBs in the carrier signal F1 for use (that is, it can be understood as a carrier signal Intra-carrier power convergence occurs in F1), resulting in an increase in the power spectral density of the carrier signal F1, which in turn causes the ratio between the power spectral density of the carrier signal F1 and the power spectral density of the carrier signal F2 to change.
  • the method described in Implementation 1 can be used to determine the clipping weight of each carrier signal according to the signal characteristics of each current carrier signal.
  • Mode 2 The signal characteristics include the modulation mode.
  • the access network device determines the clipping weight of the first carrier signal and the second carrier signal based on the modulation mode of each carrier signal, wherein the clipping weight of the first carrier signal is smaller than the clipping weight of the second carrier signal Wave weight, the modulation mode of the first carrier signal is the first modulation mode, the modulation mode of the second carrier signal is the second modulation mode, and the modulation order of the first modulation mode is higher than the modulation order of the second modulation mode.
  • the modulation method with lower modulation order (hereinafter referred to as low-order modulation) can tolerate the larger error vector magnitude (EVM), that is, the modulation method with higher modulation order (hereinafter referred to as low-order modulation) (referred to as high-order modulation for short) can tolerate the smaller the ENM.
  • EVM error vector magnitude
  • Table 1 is the correspondence table between modulation modes and EVM tolerances, wherein the EVM tolerance corresponding to quadrature phase shift keying (QPSK) is 17.5%, and the quadrature amplitude of 16
  • QPSK quadrature phase shift keying
  • QAM quadrature amplitude modulation
  • 64QAM 64QAM
  • 256QAM 256QAM
  • the access network device can determine the clipping weight of each carrier signal according to the modulation method of each carrier signal, that is, the clipping weight of the high-order modulated carrier signal is less than Clipping weights for low-order modulated carrier signals.
  • the signal feature includes a modulation mode and a first signal feature, where the first signal feature includes one or more of power, bandwidth, frequency, or power spectral density.
  • the access network device determines the clipping weight corresponding to each carrier signal based on the first signal characteristics of each carrier signal in the first combined signal.
  • the clipping weight corresponding to each carrier signal is updated, wherein the updated clipping weight of each carrier and the modulation order of the modulation mode of each carrier signal are negatively correlated.
  • the access network device may, according to the specific implementation method in Mode 1, based on each carrier signal The first signal characteristics (one or more of power, bandwidth, frequency point, or power spectral density) of , determine the clipping weight corresponding to each carrier signal. Further, in order to improve the demodulation performance of the high-order modulated carrier, the access network device adjusts the clipping weight of each carrier according to the modulation mode of each carrier signal, that is, the clipping weight corresponding to the high-order modulated carrier signal is reduced. , yes, the clipping weight of the high-order modulated carrier signal is smaller than that of the low-order modulated carrier signal.
  • FIG. 6c is another application scenario of the signal processing method provided by the present application.
  • the combined signal includes two carrier signals: carrier signal F1 (modulation mode is QPSK) and carrier signal F2 (modulation mode is QPSK)
  • the mode is 256QAM), in order to improve the demodulation performance of the high-order modulated carrier, that is, to improve the demodulation performance of the carrier signal F2 modulated by 256QAM, in this application scenario, the second or third mode can be used to determine the carrier signal F1 and the carrier signal. Clipping weight for F2.
  • the access network device determines the first clipping noise power corresponding to each carrier signal based on the second clipping noise power of each carrier signal and the clipping weight corresponding to each carrier signal. That is, it can be understood that the first clipping noise power of the carrier signal is the product of the clipping weight corresponding to the carrier signal and the second clipping noise power of the carrier signal.
  • FIG. 7 shows a schematic structural diagram of a communication apparatus according to an embodiment of the present application.
  • the communication apparatus shown in FIG. 7 can be used to implement part or all of the functions of the access network device in the embodiment corresponding to the above signal processing method.
  • the communication apparatus shown in FIG. 7 may be used to implement part or all of the functions of the access network device in the method embodiments described in the foregoing FIG. 2 and FIG. 5 .
  • the device may be an access network device, or a device in the access network device, or a device that can be matched and used with the access network device. Wherein, the communication device may also be a chip system.
  • the communication device shown in FIG. 7 may include a determination module 701 and a clipping module 702, the determining module 701 may be a BBU, and the clipping module 702 may be an RRU or an active antenna processing unit (active antenna unit, AAU), wherein:
  • a determination module 701 configured to determine the first clipping noise power corresponding to each carrier signal based on the signal characteristic of each carrier signal if at least one of the signal characteristics of each carrier signal in the first combined signal is detected to change;
  • the clipping module 702 is used to clip each carrier signal based on the corresponding first clipping noise power of each carrier signal; wherein, the signal characteristics include one of power, bandwidth, frequency point, power spectral density or modulation mode. variety.
  • the determining module 701 is specifically configured to: determine the clipping weight corresponding to each carrier signal based on the signal characteristics of each carrier signal in the first combined signal; determine each carrier based on the clipping weight corresponding to each carrier signal The first clipping noise power corresponding to the signal.
  • the determining module 701 is specifically configured to: determine the second clipping noise power corresponding to each carrier signal based on the preset signal threshold of the first combined signal; based on the second clipping noise corresponding to each carrier signal The power and the power of each carrier signal determine the clipping weight corresponding to each carrier signal.
  • the determining module 701 is specifically configured to: based on the preset signal threshold of the first combined signal, clip the first combined signal to obtain the second combined signal; decompose the second combined signal to obtain the second combined signal The nonlinear part of the second combined signal; Taylor expansion and Fourier transform are performed on the nonlinear part of the second combined signal to obtain the power spectral density of the nonlinear part; based on the frequency and bandwidth of each carrier signal, the nonlinear Part of the power spectral density is integrated to obtain the second clipping noise power corresponding to each carrier signal.
  • the determining module 701 is specifically configured to: determine the first clipping noise power corresponding to each carrier signal based on the second clipping noise power of each carrier signal and the clipping weight corresponding to each carrier signal.
  • the signal characteristic includes a modulation mode and a first signal characteristic
  • the first signal characteristic includes one or more of power, bandwidth, frequency, or power spectral density
  • the determining module 701 is specifically configured to: based on The first signal feature of each carrier signal in the first combined signal determines the clipping weight corresponding to each carrier signal; based on the modulation mode of each carrier signal, the clipping weight corresponding to each carrier signal is updated, wherein the updated each carrier signal
  • the clipping weight of is negatively correlated with the modulation order of the modulation mode of each carrier signal.
  • the signal characteristic includes a modulation mode
  • the determining module 701 is specifically configured to: determine the clipping weight of the first carrier signal and the clipping weight of the second carrier based on the modulation mode of each carrier signal; The clipping weight of the carrier signal is smaller than the clipping weight of the second carrier signal, the modulation mode of the first carrier signal is the first modulation mode, the modulation mode of the second carrier signal is the second modulation mode, and the modulation order of the first modulation mode higher than the modulation order of the second modulation mode.
  • a communication apparatus 80 provided by an embodiment of the present application is used to implement the functions of the access network device of the above signal processing method.
  • the apparatus may be an apparatus of an access network device.
  • the means for the access network device may be a chip system or chip in the access network device. Wherein, the chip system may be composed of chips, and may also include chips and other discrete devices.
  • the communication apparatus 80 includes at least one processor 820, configured to implement the data processing function of the access network device in the method provided in the embodiment of the present application.
  • the apparatus 80 may further include a communication interface 810, configured to implement the sending and receiving operations of the access network device in the method provided in the embodiment of the present application.
  • the communication interface may be a transceiver, a circuit, a bus, a module or other types of communication interfaces, which are used to communicate with other devices through a transmission medium.
  • the communication interface 810 is used by the apparatus in the apparatus 80 to communicate with other devices.
  • the processor 820 uses the communication interface 810 to send and receive data, and is used to implement the methods described in the above method embodiments.
  • Apparatus 80 may also include at least one memory 830 for storing program instructions and/or data.
  • Memory 830 is coupled to processor 820 .
  • the coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units or modules, which may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules.
  • Processor 820 may cooperate with memory 830 .
  • Processor 820 may execute program instructions stored in memory 830 . At least one of the at least one memory may be included in the processor.
  • the specific connection medium between the communication interface 810 , the processor 820 , and the memory 830 is not limited in the embodiments of the present application.
  • the memory 830, the processor 820, and the communication interface 810 are connected through a bus 840 in FIG. 8.
  • the bus is represented by a thick line in FIG. 8, and the connection between other components is only for schematic illustration. , is not limited.
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is used in FIG. 8, but it does not mean that there is only one bus or one type of bus.
  • the communication interface 810 may output or receive baseband signals.
  • the output or reception of the communication interface 810 may be a radio frequency signal.
  • the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, which can implement or The methods, steps and logic block diagrams disclosed in the embodiments of this application are executed.
  • a general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the methods disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.
  • Embodiments of the present application further provide a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed, the method performed by the access network device in the above method embodiment is executed. accomplish.
  • Embodiments of the present application further provide a computer program product, where the computer program product includes a computer program, when the computer program is executed, the method performed by the access network device in the above method embodiments is implemented.

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Abstract

本申请提供了一种信号处理方法及通信装置，该方法包括：若检测到第一合路信号中各个载波信号的信号特征中的至少一种发生变化，则基于各个载波信号的信号特征确定各个载波信号对应的第一削波噪声功率；基于各个载波信号对应的第一削波噪声功率对各个载波信号进行削波；其中，该信号特征包括功率、带宽、频点、功率谱密度或调制方式中的一种或多种。通过此方法，对各个载波信号进行削波处理，以降低OFDM系统中PAPR，并且当各个载波信号的信号特征发生变化时，接入网设备可以根据各个载波信号变化后的信号特征确定各个载波信号的削波噪声功率，使得该削波噪声功率与各个载波信号动态适配，避免漏削的情况，提升系统功放鲁棒性。

Description

一种信号处理方法及通信装置 技术领域
本申请涉及通信技术领域，特别涉及一种信号处理方法及通信装置。
背景技术
正交频分复用(orthogonalfrequency-divisionmultiplexing，OFDM)中各个载波相互正交，使每个载波在一个符号时间内可以有整数个载波周期，并且每个载波的频谱零点和相邻载波的零点重叠，这样便减小了载波间的干扰。但OFDM符号是由多个独立经过调制的载波信号叠加而成的，当各个载波相位相同或者相近时，叠加信号便会受到相同初始相位信号的调制，从而产生较大的瞬时功率峰值，进一步带来较高的峰值平均功率比(peak to average power ratio，PAPR)。通常功率放大器的动态范围有限，PAPR较大的OFDM信号极易进入功率放大器的非线性区域，导致信号产生非线性失真，造成明显的频谱扩展干扰以及带内信号畸变，导致整个系统性能严重下降。
可见，如何降低OFDM系统中PAPR提升系统性能是一个亟待解决的问题。
发明内容
本申请提供了一种信号处理方法及通信装置，通过该方法可以降低OFDM系统中的PAPR，进而减小信号非线性失真，提升系统性能。
第一方面，本申请提供一种信号处理方法，该方法包括：若检测到第一合路信号中各个载波信号的信号特征中的至少一种发生变化，则基于各个载波信号的信号特征确定各个载波信号对应的第一削波噪声功率；基于各个载波信号对应的第一削波噪声功率对各个载波信号进行削波；其中，该信号特征包括功率、带宽、频点、功率谱密度或调制方式中的一种或多种。
基于第一方面所描述的方法，通过对各个载波信号进行削波处理，以降低OFDM系统中PAPR，并且当各个载波信号的信号特征发生变化时，接入网设备可以根据各个载波信号变化后的信号特征确定各个载波信号的削波噪声功率，使得该削波噪声功率与各个载波信号动态适配，避免漏削的情况，提升系统功放鲁棒性。
在一种可能的实现中，基于该第一合路信号中各个载波信号的信号特征，确定各个载波信号对应的削波权重；基于各个载波信号对应的削波权重确定各个载波信号对应的第一削波噪声功率。通过实施该可能的实现，载波信号的信号特征影响该载波信号的削波权重，进而影响该载波信号的削波噪声功率，即可以理解为载波信号的削波噪声功率与载波信号的信号特征匹配，从而避免漏削的情况。
在一种可能的实现中，基于第一合路信号的预设信号门限，确定各个载波信号对应的第二削波噪声功率；基于各个载波信号对应的第二削波噪声功率和各个载波信号的功率，确定各个载波信号对应的削波权重。通过实施该可能的实现，结合载波信号的当前功率确定该载波信号的削波权重，可以提升确定出的削波噪声功率的准确性。
在一种可能的实现中，基于第一合路信号的预设信号门限，对第一合路信号进行削波得到第二合路信号；分解第二合路信号，得到第二合路信号的非线性部分；对第二合路信 号的非线性部分进行泰勒展开和傅里叶变换，得到非线性部分的功率谱密度；基于各个载波信号的频点和带宽对非线性部分的功率谱密度进行积分，得到各个载波信号对应的第二削波噪声功率。通过实施该可能的实现，结合载波信号的多个信号特征共同确定该载波信号对应未加权削波噪声功率(可以理解为原始削波噪声功率)，可以提升确定出的未加权削波噪声功率的准确性。
在一种可能的实现中，基于各个载波信号的第二削波噪声功率和各个载波信号对应的削波权重，确定各个载波信号对应的第一削波噪声功率。通过实施该可能的实现，载波信号的削波噪声功率由前述原始削波噪声功率和削波权重共同确定，可以提升载波信号的削波噪声功率的准确性和削波噪声功率与载波信号之间的适配性。
在一种可能的实现中，信号特征包括调制方式，且该信号特征还包括功率、带宽、频点或功率谱密度中的一种或多种，基于第一合路信号中各个载波信号的第一信号特征，确定各个载波信号对应的削波权重，第一信号特征为功率、带宽、频点或功率谱密度中的一种或多种；基于各个载波信号的调制方式，更新各个载波信号对应的削波权重，其中，更新后的各个载波的削波权重与各个载波信号的调制方式的调制阶数是负相关的。通过实施该可能的实现，在根据载波信号的功率、带宽、频点或功率谱密度确定削波权重后，还可以根据载波信号的调制方式来对削波权重进行调整，以使接入网设备在保证削波噪声功率与载波信号之间适配性的同时，改善高阶调制载波的解调性。
在一种可能的实现中，信号特征包括调制方式，确定第一载波信号的削波权重和第二载波的削波权重；其中，第一载波信号的削波权重小于第二载波信号的削波权重，第一载波信号的调制方式为第一调制方式，第二载波信号的调制方式为第二调制方式，第一调制方式的调制阶数高于第二调制方式的调制阶数。通过实施该可能的实现，接入网设备根据载波信号的调制方式确定载波信号的削波权重，以使高阶调制方式的载波信号的削波较小，进而改善高阶调制载波的解调性。
第二方面，提供了一种通信装置，该装置可以是第一通信设备，也可以是第一通信设备中的装置，或者是能够和第一通信设备匹配使用的装置。其中，该通信装置还可以为芯片系统。该通信装置可执行第一方面所述的方法。该通信装置的功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的单元。该单元可以是软件和/或硬件。该通信装置执行的操作及有益效果可以参见上述第一方面所述的方法以及有益效果，重复之处不再赘述。
第三方面，本申请提供一种通信装置，所述通信装置包括处理器，当所述处理器调用存储器中的计算机程序时，如第一方面所述的方法中第一通信设备执行的方法被执行。
第四方面，本申请提供一种通信装置，所述通信装置包括处理器和存储器，所述存储器用于存储计算机执行指令；所述处理器用于执行所述存储器所存储的计算机执行指令，以使所述通信装置执行如第一方面所述的方法中第一通信设备执行的方法。
第五方面，本申请提供一种通信装置，所述通信装置包括处理器、存储器和收发器，所述收发器，用于接收信号或者发送信号；所述存储器，用于存储计算机程序；所述处理器，用于从所述存储器调用所述计算机程序执行如第一方面所述的方法中第一通信设备执行的方法。
第六方面，本申请提供一种通信装置，所述通信装置包括处理器和接口电路，所述接口电路，用于接收计算机执行指令并传输至所述处理器；所述处理器运行所述计算机执行 指令以执行如第一方面所述的方法中第一通信设备执行的方法。
第七方面，本申请提供一种计算机可读存储介质，所述计算机可读存储介质用于存储计算机执行指令，当该计算机执行指令被执行时，使得如第一方面所述的方法中第一通信设备执行的方法被实现。
第八方面，本申请提供一种包括计算机程序的计算机程序产品，当该计算机程序被执行时，使得如第一方面所述的方法中第一通信设备执行的方法被实现。
第九方面，本申请提供一种通信系统，该通信系统包括上述第二方面、第三方面、第四方面、第五方面或第六方面所述的通信装置。
附图说明
图1为本申请提供的信号处理方法的一种应用场景的示意图；
图2为本申请提供的一种信号处理方法的流程示意图；
图3a为本申请提供的一种合路信号S的时域信号图的示意图；
图3b为本申请提供的一种合路信号S的频域信号图的示意图；
图4为本申请提供的一种对载波信号进行削波的示意图；
图5为本申请提供的一种确定各个载波对应的第一削波噪声功率方法的流程示意图；
图6a为本申请提供的信号处理方法的一种应用场景的示意图；
图6b为本申请提供的信号处理方法的另一种应用场景的示意图；
图6c为本申请提供的信号处理方法的又一种应用场景的示意图；
图7为本申请提供的一种通信装置的结构示意图；
图8为本申请实施例提供的另一种通信装置的结构示意图。
具体实施方式
为了使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请作进一步地详细描述。
本申请的说明书、权利要求书及附图中的术语“第一”和“第二”等是用于区别不同对象，而不是用于描述特定顺序。此外，术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。例如包含了一系列操作或单元的过程、方法、系统、产品或设备没有限定于已列出的操作或单元，而是可选地还包括没有列出的操作或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其它操作或单元。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
在本申请中，“至少一个(项)”是指一个或者多个，“多个”是指两个或两个以上，“至少两个(项)”是指两个或三个及三个以上，“和/或”，用于描述对应对象的对应关系，表示可以存在三种关系，例如，“A和/或B”可以表示：只存在A，只存在B以及同时存在A和B三种情况，其中A，B可以是单数或者复数。字符“/”一般表示前后对应对象是一种“或”的关系。“以下至少一项(个)”或其类似表达，是指这些项中的任意组合，包括单项(个) 或复数项(个)的任意组合。例如，a，b或c中的至少一项(个)，可以表示：a，b，c，“a和b”，“a和c”，“b和c”，或“a和b和c”，其中a，b，c可以是单个，也可以是多个。
为了更好地理解本申请提供的方案，下面先对本申请的系统架构进行介绍：
本申请实施例提供的方法可以应用于各类通信系统中，例如，可以是物联网(internet of things，IoT)系统、窄带物联网(narrow band internet of things，NB-IoT)系统、长期演进(long term evolution，LTE)系统，也可以是第五代(5th-generation，5G)通信系统，还可以是LTE与5G混合架构、也可以是5G新无线(new radio，NR)系统，以及未来通信发展中出现的新的通信系统等。
请参见图1，图1是本申请提供的信号处理方法的一种应用场景的示意图。在这个应用场景中，用户设备(user equipment，UE)1、UE2和UE3属于服务小区11，UE4、UE5和UE6属于服务小区12。接入网设备((radio)access network，(R)AN)10通过载波信号1向服务小区11内的UE传递数据，通过载波信号2向服务小区12内的UE传递数据。其中，载波信号1和载波信号2共用同一射频通道，即在该射频通道中载波信号1和载波信号组成一个合路信号(可以理解为该合路信号包括载波信号1和载波信号2)。
需要知晓的是，本申请所提及的接入网设备是网络侧的一种用于发射或接收信号的实体，即为将终端设备接入到无线网络的节点或设备，接入网设备例如包括但不限于：5G通信系统中的新一代基站(generation node B，gNB)、演进型节点B(evolved node B，eNB)、下一代演进型节点B(next generation eNB，ng-eNB)、无线回传设备、无线网络控制器(radio network controller，RNC)、节点B(node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站((home evolved nodeB，HeNB)或(home node B，HNB))、射频拉远单元(remote radio unit，RRU)、基带单元(baseBand unit，BBU)、传输接收点(transmitting and receiving point，TRP)、发射点(transmitting point，TP)、移动交换中心等。本申请仅是以包括RRU和BBU的接入网设备为例进行说明，但不限于此。
下面先对本申请实施例涉及的相关技术特征进行解释说明。需要说明的是，这些解释是为了让本申请实施例更容易被理解，而不应该视为对本申请所要求的保护范围的限定。
峰值平均功率比(peak to average power ratio，PAPR)：是指峰值功率与平均功率的比，其中峰值功率可以理解为信号的瞬间最大输出功率，平均功率就是信号的平均功率。
削波(也称削峰)：对信号设定削波门限(后文中也称为预设信号门限)对原始信号的峰值进行抑制。其中，削波门限可以理解削波幅值门限或削波功率门限。而原始信号与削波门限之间的差值称为削波噪声功率，即可以理解为削波噪声功率是原始信号被削波门限削掉的部分。
根据上述相关特征的描述，为了降低OFDM系统中PAPR，可以在发射机的中频侧设计削波算法来削减原始信号的峰值幅度，进而降低OFDM系统中的PAPR。利用削波算法降低PAPR的原理为：当载波信号的模值(即信号幅度值)大于预设模值门限值时，则将该载波信号的模值更新为该预设模值门限值；当载波信号的模值小于预设模值门限值时，则载波信号的模值不变。但通过这样的方法，虽然降低了OFDM系统中的PAPR，但当载波间信号特征动态发生变化时，这样的方法则会造成载波信号与削波噪声(载波信号幅度值与预设模值门限之间的差值)的失配，从而产生漏削，影响系统鲁棒性。
基于此，本申请提供了一种信号处理方法，根据各个载波信号的当前信号特征，确定 各个载波信号的削波噪声功率，使得确定出的削波噪声功率与载波信号之间动态适配，从而在降低OPDM系统PAPR的同时避免了漏削的情况，提升了系统功放鲁棒性。
下面对本申请实施例提供的信号处理方法进行进一步详细描述：
请参见图2，图2是本申请提供的一种信号处理方法的流程示意图。如图2所示，该信号处理方法包括如下S201～S202。图2所示的方法执行主语可以为接入网设备，或执行主语可以为接入网设备的芯片。图2以接入网设备为方法的执行主题为例进行说明。本申请实施例的其他附图所示的信号处理方法的执行主语同理，后文不再赘述。其中：
S201、若检测到第一合路信号中各个载波信号的信号特征中的至少一种发生变化，则基于各个载波信号的信号特征确定各个载波信号对应第一削波噪声功率。
其中，上述信号特征包括但不限于以下特征中的一项或多项：功率、带宽、频点、功率谱密度或调制方式。第一合路信号为接入网设备发送的原始合路信号，可以理解为未经削波的信号，由多个载波信号组成(或可以理解为合路信号包括多个载波信号)。示例性地，若合路信号S包括两个载波信号：载波信号S1和载波信号S2。从时域和频域对该合路信号进行分解示意：请参见图3a，图3a为合路信号S的时域信号图，其中，曲线31为载波信号S1，曲线32为载波信号S2；请参见图3b，图3b为合路信号S的频域信号图，其中，区域33为载波信号S1，区域34为载波信号S2。
接入网设备对第一合路信号中的每个载波信号的信号特征进行检测，若检测到第一合路信号中的任一个载波信号的信号特征发生变化，则接入网设备基于合路信号中的每个载波信号的信号特征确定各个载波信号对应第一削波噪声功率。需要知晓的是，接入网设备对第一合路信号中各个载波信号的信号特征进行检测的方式可以持续检测，也可以是按照时间值进行周期性地检测，本申请对此不做具体限制。
示例性地，第一合路信号S中包括载波信号S1和载波信号S2，接入网设备对载波信号S1的信号特征和载波信号S2的信号特征进行检测。在接入网设备检测各个载波信号的信号特征的前一检测时刻，载波信号S1的信号特征包括：功率P1、带宽D1、频点H1、功率谱密度R1和调制方式Q1，载波信号S2的信号特征包括：功率P2、带宽D2、频点H2、功率谱密度R2和调制方式Q2，此时接入网设备根据载波信号S1的信号特征和载波信号S2的信号特征确定出载波信号S1的第一削波噪声功率为N1，载波信号S2的第一削波噪声功率为N2。在当前检测时刻，若接入网设备检测到载波信号S1的功率谱密度由功率谱密度R1变化为了功率谱密度R1'。在这样的情况下，接入网设备根据载波信号S1的信号特征(即功率P1、带宽D1、频点H1、功率谱密度R1'和调制方式Q1)和载波信号S2的信号特征即(功率P2、带宽D2、频点H2、功率谱密度R2和调制方式Q2)，确定载波信号S1对应的第一削波噪声功率N1'和载波信号S2对应的第二削波噪声功率N2'。
S202、基于各个载波信号对应的第一削波噪声功率对各个载波信号进行削波。
针对每个载波信号，接入网设备基于该载波信号对应第一削波噪声功率对该载波信号进行削波。示例性地，载波信号S1对应的第一削波噪声功率为N1，请参见图4，图4为本申请提供的一种对载波信号进行削波的示意图。图4中，模块41为削波前的载波信号S1，模块42为根据第一削波噪声功率N1削波后的载波信号S1。
采用上述方法，可见，通过各个载波信号的削波噪声功率对各个载波信号进行削波可以有效的降低系统中PAPR，提升系统性能。并且，当前时刻载波信号的信号特征确定各个 载波信号的削波噪声功率，即载波信号的任一信号特征发生变化，则各个载波信号的削波噪声功率也会发生变化，从而使得载波信号的削波噪声功率与载波信号之间适配，避免漏削的情况，提升系统功放鲁棒性。
下面以图2为基础，对基于各个载波信号的信号特征确定各个载波信号对应的第一削波噪声功率的方法进行详细介绍。
请参见图5，图5是本申请提供的一种确定各个载波对应的第一削波噪声功率方法的流程示意图。如图5所示，该确定各个载波对应的第一削波噪声功率方法包括如下S501～S502。图5所示的方法执行主语可以为接入网设备，或执行主语可以为接入网设备的芯片。图5以接入网设备为方法的执行主题为例进行说明。其中：
S501、基于前述第一合路信号中各个载波信号的信号特征，确定各个载波信号对应的削波权重。
根据各个载波信号的信号特征确定各个载波信号对应的削波权重，针对信号特征组合的多样性，确定各个载波信号的削波权重的方式也略有不同。下面基于信号特征组合的多样性，对确定各个载波信号的削波权重的方式进行详细介绍。
方式一：信号特征包括功率、带宽、频点或功率谱密度中的一种或多种。
在这种情况下，接入网设备基于第一合路信号的预设信号门限，确定各个载波信号对应的第二削波噪声功率，进一步地，接入网设备基于各个载波信号对应的第二削波噪声功率和各个载波信号的功率，确定各个载波信号对应的削波权重。其中，预设信号门限可以根据具体应用场景进行相应的调整，本申请对预设信号门限的具体数值不做具体限定。
接入网设备基于第一合路信号的预设信号门限，确定各个载波信号对应的第二削波噪声功率。进一步地，接入网设备可以基于各个载波信号的功率之间的比值，以及各个载波信号对应的第二削波噪声功率之间比值确定各个载波信号对应的削波权重。示例性地，第一合路信号包括载波信号S1和载波信号S2，其中，载波信号S1的功率为P1且载波信号S1的第二削波噪声N1，载波信号S2的功率为P2且载波信号S1的第二削波噪声N2。若P1与P2之间的比值为10:1，N1与N2之间的比值为5:1，在这样的情况下，为了保障各个载波信号恶化程度相同，即使载波信号S1中每一份功率对应的削波噪声功率与载波信号S2中每一份功率对应的削波噪声功率相同，将载波信号S1对应的削波权重W1与载波信号S2对应的削波权重W2之间的比值确定为2:1。换句话而言，为了保障各个载波信号恶化程度相同，各个载波信号对应第二削波噪声功率与削波权重的乘积之比应与各个载波信号的功率之比相同。
下面对接入网设备计算各个载波信号的第二削波噪声功率的具体过程进行详细介绍：
步骤一
接入网设备基于该第一合路信号的预设信号门限，对第一合路进行削波得到第二合路信号，并分解该第二合路信号，得到该第二合路信号的非线性部分，如公式(1)所示。
S 0(t)＝α.S(t)+n d(t)   (1)
其中，S 0(t)为第二合路信号，即是第一合路信号S经过预设信号门限削波后的输出信号。α.S(t)为第二合路信号S 0(t)分解后的线性部分，n d(t)为第二合路信号S 0(t)信号分解后的非线性部分。
步骤二
接入网设备对该第二合路信号的非线性部分进行泰勒展开，即可以理解为将第二合路信号的自相关函数进行泰勒展开。具体地，对该第二合路信号求自相关函数，并进行泰勒展开后如公式(2)所示。
Figure PCTCN2021084182-appb-000001
其中，
Figure PCTCN2021084182-appb-000002
为第二合路信号的自相关函数进行泰勒展开后得到的式子，c 0[R SS(τ)]为公式(1)中线性部分α.S(t)的自相关函数进行泰勒展开后得到的式子，
Figure PCTCN2021084182-appb-000003
为公式(1)中非线性部分n d(t)的自相关函数进行泰勒展开后得到的式子。
步骤三
对泰勒展开后的第二合路信号的非线性部分(即公式(2)中
Figure PCTCN2021084182-appb-000004
)进行傅里叶变换，得到该非线性部分的功率谱密度。具体地，对泰勒展开后的第二合路信号进行傅里叶变换后如公式(3)所示。
Figure PCTCN2021084182-appb-000005
其中，
Figure PCTCN2021084182-appb-000006
为对第二合路信号(即公式(2)中
Figure PCTCN2021084182-appb-000007
)进行傅里叶变换后得到的式子，c 0[S SS(f)]为对第二合路信号的线性部分(即公式(2)中c 0[R SS(τ)])进行傅里叶变换后得到的式子，
Figure PCTCN2021084182-appb-000008
为对第二合路信号的非线性部分(即公式(2)中
Figure PCTCN2021084182-appb-000009
进行泰勒展开后得到的式子，在
Figure PCTCN2021084182-appb-000010
为中S SS(f)的个数为2n+1个。
步骤四
基于各个载波信号的频点和带宽对该非线性部分的功率谱密度进行积分，得到各个载波信号对应的第二削波噪声功率。示例性地，第一合路信号S包括载波信号S1和载波信号S2，在这种情况下，接入网设备基于载波信号S1的频点H1和带宽D1对公式(3)中
Figure PCTCN2021084182-appb-000011
进行积分，得到载波信号S1对应的第二削波噪声功率；接入网设备基于载波信号S2的频点H2和带宽D2对公式(3)中
Figure PCTCN2021084182-appb-000012
进行积分，得到载波信号S2对应的第二削波噪声功率。
请参见图6a，图6a为本申请提供的信号处理方法的一种应用场景，在该场景中合路信号包括两个载波信号：载波信号F1(功率为P1)和载波信号F2(功率为P2)，由于接入网设备对各个载波信号的动态配比，如将原本属于载波信号F2的部分功率共享于载波信号F1，即可以理解为载波信号F2将一部分功率借给载波信号F1使用，从而导致载波信号F1的功率(变为P2'，该P2'小于P2)与载波信号F2的功率(变为P1'，该P1'大于P1)之间的比值发生变化。在这样的应用场景中可用实现1中所描述的方法，根据当前各个载波信号的信号特征确定各个载波信号的削波权重。
请参见图6b，图6b为本申请提供的信号处理方法的另一种应用场景，在该场景中合路信号包括两个载波信号：载波信号F1(功率为P1)和载波信号F2(功率为P2)，为了提升载波信号F1的信号覆盖范围，接入网设备将载波信号F1中部分未调度的资源块(resource  block，RB)借给载波信号F1中其他RB使用(即可以理解为载波信号F1发生了载波内功率汇聚)，导致载波信号F1的功率谱密度变大，进而导致载波信号F1的功率谱密度与载波信号F2的功率谱密度之间的比值发生变化。在这样的应用场景中可用实现1中所描述的方法，根据当前各个载波信号的信号特征确定各个载波信号的削波权重。
方式二：信号特征包括调制方式。
在这种情况下，接入网设备基于各个载波信号的调制方式，确定第一载波信号和第二载波信号的削波权重，其中，第一载波信号的削波权重小于第二载波信号的削波权重，第一载波信号的调制方式为第一调制方式，第二载波信号的调制方式为第二调制方式，且第一调制方式的调制阶数高于第二调制方式的调制阶数。
根据通信协议指标，调制阶数较低的调制方式(后文简称为低阶调制)能够容忍的误差矢量幅度(error vector magnitude，EVM)越大，即调制阶数较高的调制方式(后文简称为高阶调制)能够容忍的ENM越小。具体地，请参见表1，表1为调制方式与EVM容忍度的对应表，其中，正交相移键控(quadrature phase shift keying，QPSK)对应的EVM容忍度为17.5％，16正交幅度调制(quadrature amplitude modulation，QAM)对应的EVM容忍度为12.5％，64QAM对应的EVM容忍度为8.0％，256QAM对应的EVM容忍度为3.5％。
表1
调制方式 EVM容忍度
QPSK 17.5％
16QAM 12.5％
64QAM 8.0％
256QAM 3.5％
为了改善采用高阶调制方式的载波信号的解调性能，接入网设备可以根据各个载波信号的调制方式，确定各个载波信号的削波权重，即使得高阶调制的载波信号的削波权重小于低阶调制的载波信号的削波权重。
方式三：信号特征包括调制方式和第一信号特征，该第一信号特征包括功率、带宽、频点或功率谱密度中的一种或多种。
在这种情况下，接入网设备基于第一合路信号中各个载波信号的第一信号特征确定各个载波信号对应的削波权重，进一步地，接入网设备基于各个载波信号的调制方式，更新各个载波信号对应的削波权重，其中，更新后的各个载波的削波权重和各个载波信号的调制方式的调制阶数是负相关的。
换而言之，信号特征包括调制方式，且还包括第一信号特征(功率、带宽、频点或功率谱密度)时，接入网设备可以根据方式一中的具体实现方法，基于各个载波信号的第一信号特征(功率、带宽、频点或功率谱密度中的一种或多种)确定各个载波信号对应的削波权重。进一步地，为了改善高阶调制载波的解调性能，接入网设备再根据各个载波信号的调制方式对各个载波的削波权重进行调整，即将高阶调制的载波信号对应的削波权重调小，是的高阶调制的载波信号的削波权重小于低阶调制的载波信号的削波权重。
请参见图6c，图6c为本申请提供的信号处理方法的又一种应用场景，在该场景中合路信号包括两个载波信号：载波信号F1(调制方式为QPSK)和载波信号F2(调制方式为256QAM)，为了改善高阶调制载波的解调性能，即改善使用256QAM调制的载波信号F2的解调性能，在该应用场景中可以使用方式二或方式三来确定载波信号F1和载波信号F2的削 波权重。
S502、基于各个载波信号对应的削波权重确定各个载波信号对应的第一削波噪声功率。
接入网设备基于各个载波信号的第二削波噪声功率和各个载波信号对应的削波权重，确定各个载波信号对应的第一削波噪声功率。即可以理解为，载波信号的第一削波噪声功率为该载波信号对应的削波权重与该载波信号的第二削波噪声功率的乘积。
请参见图7，图7示出了本申请实施例的一种通信装置的结构示意图。图7所示的通信装置可用于实现上述信号处理方法对应的实施例中接入网设备的部分或全部功能。图7所示的通信装置可以用于实现上述图2和图5所描述的方法实施例中接入网设备的部分或全部功能。该装置可以是接入网设备，也可以是接入网设备中的装置，或者是能够和接入网设备匹配使用的装置。其中，该通信装置还可以为芯片系统。图7所示的通信装置可以包括确定模块701和削波模块702，该确定模块701可以为BBU，削波模块702可以是RRU或有源天线处理单元(active antenna unit，AAU)，其中：
确定模块701，用于若检测到第一合路信号中各个载波信号的信号特征中的至少一种发生变化时，基于各个载波信号的信号特征确定各个载波信号对应的第一削波噪声功率；削波模块702，用于基于各个载波信号对应的第一削波噪声功率对各个载波信号进行削波；其中，信号特征包括功率、带宽、频点、功率谱密度或调制方式中的一种或多种。
在一个可能的实现中，确定模块701具体用于：基于第一合路信号中各个载波信号的信号特征，确定各个载波信号对应的削波权重；基于各个载波信号对应的削波权重确定各个载波信号对应的第一削波噪声功率。
在一个可能的实现中，确定模块701具体用于：基于第一合路信号的预设信号门限，确定各个载波信号对应的第二削波噪声功率；基于各个载波信号对应的第二削波噪声功率和各个载波信号的功率，确定各个载波信号对应的削波权重。
在一个可能的实现中，确定模块701具体用于：基于第一合路信号的预设信号门限，对第一合路信号进行削波得到第二合路信号；分解第二合路信号，得到第二合路信号的非线性部分；对第二合路信号的非线性部分进行泰勒展开和傅里叶变换，得到非线性部分的功率谱密度；基于各个载波信号的频点和带宽对非线性部分的功率谱密度进行积分，得到各个载波信号对应的第二削波噪声功率。
在一个可能的实现中，确定模块701具体用于：基于各个载波信号的第二削波噪声功率和各个载波信号对应的削波权重，确定各个载波信号对应的第一削波噪声功率。
在一个可能的实现中，信号特征包括调制方式和第一信号特征，且第一信号特征包括功率、带宽、频点或功率谱密度中的一种或多种，确定模块701具体用于：基于第一合路信号中各个载波信号的第一信号特征，确定各个载波信号对应的削波权重；基于各个载波信号的调制方式，更新各个载波信号对应的削波权重，其中，更新后的各个载波的削波权重与各个载波信号的调制方式的调制阶数是负相关的。
在一个可能的实现中，信号特征包括调制方式，确定模块701具体用于：基于各个载波信号的调制方式，确定第一载波信号的削波权重和第二载波的削波权重；其中，第一载波信号的削波权重小于第二载波信号的削波权重，第一载波信号的调制方式为第一调制方式，第二载波信号的调制方式为第二调制方式，第一调制方式的调制阶数高于第二调制方式的调制阶数。
如图8所示为本申请实施例提供的一种通信装置80，用于实现上述信号处理方法的接入网设备的功能。该装置可以是接入网设备的装置。用于接入网设备的装置可以为接入网设备内的芯片系统或芯片。其中，芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。
通信装置80包括至少一个处理器820，用于实现本申请实施例提供的方法中接入网设备的数据处理功能。装置80还可以包括通信接口810，用于实现本申请实施例提供的方法中接入网设备的收发操作。在本申请实施例中，通信接口可以是收发器、电路、总线、模块或其它类型的通信接口，用于通过传输介质和其它设备进行通信。例如，通信接口810用于装置80中的装置可以和其它设备进行通信。处理器820利用通信接口810收发数据，并用于实现上述方法实施例所述的方法。
装置80还可以包括至少一个存储器830，用于存储程序指令和/或数据。存储器830和处理器820耦合。本申请实施例中的耦合是装置、单元或模块之间的间接耦合或通信连接，可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。处理器820可能和存储器830协同操作。处理器820可能执行存储器830中存储的程序指令。所述至少一个存储器中的至少一个可以包括于处理器中。
本申请实施例中不限定上述通信接口810、处理器820以及存储器830之间的具体连接介质。本申请实施例在图8中以存储器830、处理器820以及通信接口810之间通过总线840连接，总线在图8中以粗线表示，其它部件之间的连接方式，仅是进行示意性说明，并不引以为限。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图8中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
装置80具体是用于接入网设备的装置时，例如装置80具体是芯片或者芯片系统时，通信接口810所输出或接收的可以是基带信号。装置80具体是接入网设备时，通信接口810所输出或接收的可以是射频信号。在本申请实施例中，处理器可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件，可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。
本申请实施例还提供一种计算机可读存储介质，该计算机可读存储介质中存储有计算机执行指令，当该计算机执行指令被执行时，使得上述方法实施例中接入网设备执行的方法被实现。
本申请实施例还提供一种计算机程序产品，该计算机程序产品包括计算机程序，当该计算机程序被执行时，使得上述方法实施例中接入网设备执行的方法被实现。
需要说明的是，对于前述的各方法实施例，为了简单描述，故将其都表述为一系列的动作组合，但是本领域技术人员应该知悉，本申请并不受所描述的动作顺序的限制，因为依据本申请，某些步骤可以采用其他顺序或者同时进行。其次，本领域技术人员也应该知悉，说明书中所描述的实施例均属于优选实施例，所涉及的动作和模块并不一定是本申请所必须的。
本申请提供的各实施例的描述可以相互参照，对各个实施例的描述都各有侧重，某个 实施例中没有详述的部分，可以参见其他实施例的相关描述。为描述的方便和简洁，例如关于本申请实施例提供的各装置、设备的功能以及执行的步骤可以参照本申请方法实施例的相关描述，各方法实施例之间、各装置实施例之间也可以互相参考、结合或引用。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。

Claims (20)

  1. 一种信号处理方法，其特征在于，所述方法包括：
    若检测到第一合路信号中各个载波信号的信号特征中的至少一种发生变化，则基于所述各个载波信号的信号特征确定所述各个载波信号对应的第一削波噪声功率；
    基于所述各个载波信号对应的第一削波噪声功率对所述各个载波信号进行削波；
    其中，所述信号特征包括功率、带宽、频点、功率谱密度或调制方式中的一种或多种。
  2. 根据权利要求1所述方法，其特征在于，所述基于所述各个载波信号的信号特征确定所述各个载波信号对应的第一削波噪声功率，包括：
    基于所述第一合路信号中各个载波信号的信号特征，确定所述各个载波信号对应的削波权重；
    基于所述各个载波信号对应的削波权重确定所述各个载波信号对应的第一削波噪声功率。
  3. 根据权利要求2所述方法，其特征在于，所述基于所述第一合路信号中各个载波信号的信号特征，确定所述各个载波信号对应的削波权重，包括：
    基于所述第一合路信号的预设信号门限，确定所述各个载波信号对应的第二削波噪声功率；
    基于所述各个载波信号对应的第二削波噪声功率和所述各个载波信号的功率，确定所述各个载波信号对应的削波权重。
  4. 根据权利要求3所述方法，其特征在于，所述基于第一合路信号的预设信号门限，确定所述各个载波信号对应的第二削波噪声功率，包括：
    基于所述第一合路信号的预设信号门限，对所述第一合路信号进行削波得到第二合路信号；
    分解所述第二合路信号，得到所述第二合路信号的非线性部分；
    对所述第二合路信号的非线性部分进行泰勒展开和傅里叶变换，得到所述非线性部分的功率谱密度；
    基于所述各个载波信号的频点和带宽对所述非线性部分的功率谱密度进行积分，得到所述各个载波信号对应的第二削波噪声功率。
  5. 根据权利要求3或4所述方法，其特征在于，所述基于所述各个载波信号对应的削波权重确定所述各个载波信号对应的第一削波噪声功率，包括：
    基于所述各个载波信号的第二削波噪声功率和所述各个载波信号对应的削波权重，确定所述各个载波信号对应的第一削波噪声功率。
  6. 根据权利要求3-5任一项所述方法，其特征在于，所述信号特征包括调制方式和第一信号特征，且所述第一信号特征还包括功率、带宽、频点或功率谱密度中的一种或多种，所述基于所述第一合路信号中各个载波信号的信号特征确定所述各个载波信号对应的削 波权重，包括：
    基于所述第一合路信号中各个载波信号的第一信号特征，确定所述各个载波信号对应的削波权重；
    基于所述各个载波信号的调制方式，更新所述各个载波信号对应的削波权重，其中，更新后的各个载波的削波权重与所述各个载波信号的调制方式的调制阶数是负相关的。
  7. 根据权利要求2所述方法，其特征在于，所述信号特征包括调制方式，所述基于所述第一合路信号中各个载波信号的信号特征，确定所述各个载波信号对应的削波权重，包括：
    基于所述各个载波信号的调制方式，确定第一载波信号的削波权重和第二载波信号的削波权重；
    其中，所述第一载波信号的削波权重小于所述第二载波信号的削波权重，所述第一载波信号的调制方式为第一调制方式，所述第二载波信号的调制方式为第二调制方式，所述第一调制方式的调制阶数高于所述第二调制方式的调制阶数。
  8. 一种通信装置，其特征在于，所述通信装置包括：
    确定模块，用于若检测到第一合路信号中各个载波信号的信号特征中的至少一种发生变化，则基于所述各个载波信号的信号特征确定所述各个载波信号对应的第一削波噪声功率；
    削波模块，用于基于所述各个载波信号对应的第一削波噪声功率对所述各个载波信号进行削波；
    其中，所述信号特征包括功率、带宽、频点、功率谱密度或调制方式中的一种或多种。
  9. 根据权利要求8所述装置，其特征在于，所述确定模块具体用于：
    基于所述第一合路信号中各个载波信号的信号特征，确定所述各个载波信号对应的削波权重；
    基于所述各个载波信号对应的削波权重确定所述各个载波信号对应的第一削波噪声功率。
  10. 根据权利要求9所述装置，其特征在于，所述确定模块具体用于：
    基于第一合路信号的预设信号门限，确定所述各个载波信号对应的第二削波噪声功率；
    基于所述各个载波信号对应的第二削波噪声功率和所述各个载波信号的功率，确定所述各个载波信号对应的削波权重。
  11. 根据权利要求10所述装置，其特征在于，所述确定模块具体用于：
    基于所述第一合路信号的预设信号门限，对所述第一合路信号进行削波得到第二合路信号；
    分解所述第二合路信号，得到所述第二合路信号的非线性部分；
    对所述第二合路信号的非线性部分进行泰勒展开和傅里叶变换，得到所述非线性部分的功率谱密度；
    基于所述各个载波信号的频点和带宽对所述非线性部分的功率谱密度进行积分，得到所述各个载波信号对应的第二削波噪声功率。
  12. 根据权利要求10或11所述装置，其特征在于，所述确定模块具体用于：
    基于所述各个载波信号的第二削波噪声功率和所述各个载波信号对应的削波权重，确定所述各个载波信号对应的第一削波噪声功率。
  13. 根据权利要求10-12任一项所述装置，其特征在于，所述信号特征包括调制方式和第一信号特征，且所述第一信号信号特征包括功率、带宽、频点或功率谱密度中的一种或多种，所述确定模块具体用于：
    基于所述第一合路信号中各个载波信号的第一信号特征，确定所述各个载波信号对应的削波权重；
    基于所述各个载波信号的调制方式，更新所述各个载波信号对应的削波权重，其中，更新后的各个载波的削波权重与所述各个载波信号的调制方式的调制阶数是负相关的。
  14. 根据权利要求9所述装置，其特征在于，所述信号特征包括调制方式，所述确定模块具体用于：
    基于所述各个载波信号的调制方式，确定第一载波信号的削波权重和第二载波的削波权重；
    其中，所述第一载波信号的削波权重小于所述第二载波信号的削波权重，所述第一载波信号的调制方式为第一调制方式，所述第二载波信号的调制方式为第二调制方式，所述第一调制方式的调制阶数高于所述第二调制方式的调制阶数。
  15. 一种通信装置，所述通信装置包括处理器，当所述处理器执行存储器中的计算机程序时，如权利要求1-7中任意一项所述的方法被执行。
  16. 一种通信装置，其特征在于，包括处理器和存储器；
    所述存储器用于存储计算机执行指令；
    所述处理器用于执行所述存储器所存储的计算机执行指令，以使所述通信装置执行如权利要求1-7中任一项所述的方法。
  17. 一种通信装置，其特征在于，包括处理器、存储器和收发器；
    所述收发器，用于接收信号或者发送信号；
    所述存储器，用于存储计算机程序；
    所述处理器，用于从所述存储器调用所述计算机程序执行如权利要求1-7中任一项所述的方法。
  18. 一种通信装置，其特征在于，包括处理器和接口电路；
    所述接口电路，用于接收计算机执行指令并传输至所述处理器；所述处理器运行所述计算机执行指令以执行如权利要求1-7中任一项所述的方法。
  19. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质用于存储计算机执行指令，当所述计算机执行指令被执行时，使如权利要求1-7中任一项所述的方法被实现。
  20. 一种计算机程序产品，其特征在于，所述计算机程序产品包括计算机程序，当所述计算机程序被执行时，使如权利要求1-7中任一项所述的方法被实现。
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