EP-4742567-A1 - SIGNAL PROCESSING METHOD AND RELATED APPARATUS

EP4742567A1EP 4742567 A1EP4742567 A1EP 4742567A1EP-4742567-A1

Abstract

Embodiments of this application disclose a signal processing method and a related apparatus. The signal processing method may be applied to a communication scenario. A transmitter adjusts a power spectrum of a to-be-sent signal based on a target frequency of interference or noise. Specifically, the transmitter inverts polarities of some symbols in the to-be-sent signal based on the target frequency, so that power of a to-be-sent signal at the target frequency is suppressed, thereby helping resist impact of the interference or the noise on a channel on transmission performance. The transmitter may flexibly adjust the power spectrum of the to-be-sent signal based on an actual frequency of the interference or the noise, so that the to-be-sent signal does not overlap the interference or the noise in frequency, and a receiver can effectively filter out the interference or the noise and cause no impairment to the signal from the transmitter. The transmitter further sends identification information to the receiver, so that the receiver performs inverse transformation of power spectrum adjustment on a received signal based on the identification information, to restore the original signal that is before the transmitter performs power spectrum adjustment.

Inventors

XIN, Haiyun
YI, Pin
MA, Huixiao
LU, Yao
LI, ZHIWEI
TIAN, YU
GAO, SHIMIN
TAN, Jiansi

Assignees

Huawei Technologies Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20240704

Claims (20)

A signal processing method, comprising: obtaining a first modulated signal, wherein the first modulated signal comprises M symbol sets, each symbol set comprises N symbols, M is an integer greater than 1, and N is an integer greater than 1; inverting a polarity of at least one symbol in at least one symbol set to obtain a second modulated signal comprising M×N symbols, wherein power of the second modulated signal at a target frequency is less than power of the first modulated signal at the target frequency; generating identification information, wherein the identification information indicates polarity inversion statuses of the symbols in each symbol set; and sending the second modulated signal and the identification information.
The method according to claim 1, wherein inverting the polarity of the at least one symbol in the at least one symbol set comprises: inverting polarities of all symbols in the at least one symbol set.
The method according to claim 1 or 2, wherein inverting the polarity of the at least one symbol in the at least one symbol set comprises: if polarities of all symbols in a q th symbol set remain unchanged, determining a frequency characteristic parameter corresponding to each of a 0 th symbol set to the q th symbol set, and performing summation on frequency characteristic parameters corresponding to all of the 0 th symbol set to the q th symbol set and performing a modulo operation, to obtain a first summation value, wherein 0<q≤M-1, and the frequency characteristic parameter corresponding to each symbol set is related to the target frequency; or if polarities of all symbols in a q th symbol set are inverted, determining, based on the target frequency, a frequency characteristic parameter corresponding to each of a 0 th symbol set to the q th symbol set, and performing summation on frequency characteristic parameters corresponding to all of the 0 th symbol set to the q th symbol set and performing a modulo operation, to obtain a second summation value; and if a square of the first summation value is greater than a square of the second summation value, inverting the polarities of all the symbols in the q th symbol set; or if a square of the first summation value is less than or equal to a square of the second summation value, keeping the polarities of all the symbols in the q th symbol set unchanged.
The method according to claim 1 or 2, wherein the target frequency is 0, and a frequency characteristic parameter corresponding to the symbol set is a sum of values of all symbols in the symbol set.
The method according to claim 4, wherein the values of all the symbols in the symbol set are real numbers, and inverting the polarity of the at least one symbol in the at least one symbol set comprises: obtaining a third summation value obtained by performing summation on values of all symbols in a 0 th symbol set to a (q-1) th symbol set, and obtaining a fourth summation value obtained by performing summation on values of all symbols in a q th symbol set; and if polarities of the third summation value and the fourth summation value are the same, inverting polarities of all the symbols in the q th symbol set; or if polarities of the third summation value and the fourth summation value are different, keeping polarities of all the symbols in the q th symbol set unchanged.
The method according to claim 1 or 2, wherein the target frequency comprises a first frequency and a second frequency, a first frequency characteristic parameter corresponding to each symbol set is related to the first frequency, a second frequency characteristic parameter corresponding to each symbol set is related to the second frequency, and inverting the polarity of the at least one symbol in the at least one symbol set comprises: if polarities of all symbols in a q th symbol set remain unchanged, determining a first frequency characteristic parameter corresponding to each of a 0 th symbol set to the q th symbol set, performing summation on first frequency characteristic parameters corresponding to all of the 0 th symbol set to the q th symbol set and performing a modulo operation, to obtain a fifth summation value, determining a second frequency characteristic parameter corresponding to each of the 0 th symbol set to the q th symbol set, and performing summation on second frequency characteristic parameters corresponding to all of the 0 th symbol set to the q th symbol set and performing a modulo operation, to obtain a sixth summation value; or if polarities of all symbols in a q th symbol set are inverted, determining a first frequency characteristic parameter corresponding to each of a 0 th symbol set to the q th symbol set, performing summation on first frequency characteristic parameters corresponding to all of the 0 th symbol set to the q th symbol set and performing a modulo operation, to obtain a seventh summation value, determining a second frequency characteristic parameter corresponding to each of the 0 th symbol set to the q th symbol set, and performing summation on second frequency characteristic parameters corresponding to all of the 0 th symbol set to the q th symbol set and performing a modulo operation, to obtain an eighth summation value; and if a sum of a square of the fifth summation value and a square of the sixth summation value is greater than a sum of a square of the seventh summation value and a square of the eighth summation value, inverting the polarities of all the symbols in the q th symbol set; or if a sum of a square of the fifth summation value and a square of the sixth summation value is less than or equal to a sum of a square of the seventh summation value and a square of the eighth summation value, keeping the polarities of all the symbols in the q th symbol set unchanged.
The method according to any one of claims 3 to 6, wherein the frequency characteristic parameter corresponding to the symbol set is represented as: ∑ s j ∈ D q s j × e − i × 2 π × f Baudrate × j + q − 1 × N + P wherein S represents a symbol in the symbol set, i represents an imaginary part of a complex number, j represents a sequence number of the symbol in the symbol set, f represents the target frequency, Baudrate represents a baud rate for transmitting the second modulated signal and the identification information, q represents a sequence number of the symbol set, N represents a quantity of symbols in the symbol set, P represents a length of identification information corresponding to the symbol set, and Dq represents all the symbols in the q th symbol set.
The method according to any one of claims 2 to 7, wherein the identification information comprises M sub-identifiers that are in one-to-one correspondence with the M symbol sets, a first value of the sub-identifier indicates that polarities of all symbols in a corresponding symbol set are inverted, and a second value of the sub-identifier indicates that the polarities of all the symbols in the corresponding symbol set remain unchanged.
The method according to claim 1, wherein each symbol set comprises V symbol subsets, each symbol subset comprises a plurality of symbols, V is an integer greater than 1, and inverting the polarity of the at least one symbol in the at least one symbol set comprises: inverting polarities of all symbols in at least one symbol subset in the at least one symbol set.
The method according to claim 9, wherein inverting the polarity of the at least one symbol in the at least one symbol set comprises: if polarities of all symbols in an h th symbol subset in a q th symbol set remain unchanged, determining a frequency characteristic parameter corresponding to an h th symbol subset in each of a 0 th symbol set to the q th symbol set, and performing summation on frequency characteristic parameters corresponding to h th symbol subsets in all of the 0 th symbol set to the q th symbol set and performing a modulo operation, to obtain a ninth summation value, wherein 0≤h≤V-1, and a frequency characteristic parameter corresponding to each symbol subset is related to the target frequency; or if polarities of all symbols in an h th symbol subset in a q th symbol set are inverted, determining a frequency characteristic parameter corresponding to an h th symbol subset in each of a 0 th symbol set to the q th symbol set, and performing summation on frequency characteristic parameters corresponding to h th symbol subsets in all of the 0 th symbol set to the q th symbol set and performing a modulo operation, to obtain a tenth summation value; and if a square of the ninth summation value is greater than a square of the tenth summation value, inverting the polarities of all the symbols in the h th symbol subset in the q th symbol set; or if a square of the ninth summation value is less than or equal to a square of the tenth summation value, keeping the polarities of all the symbols in the h th symbol subset in the q th symbol set unchanged.
The method according to claim 10, wherein the frequency characteristic parameter corresponding to the symbol subset is represented as: ∑ s j ∈ U h s j × e − i × 2 π × f Baudrate × j + q − 1 × N + P wherein S represents a symbol in the symbol set, i represents an imaginary part of a complex number, j represents a sequence number of the symbol in the symbol set, f represents the target frequency, Baudrate represents a baud rate for transmitting the second modulated signal and the identification information, q represents a sequence number of the symbol set, N represents a quantity of symbols in the symbol set, P represents a length of identification information corresponding to the symbol set, and U h represents the h th symbol subset in the q th symbol set.
The method according to any one of claims 9 to 11, wherein the identification information comprises M sub-identifiers that are in one-to-one correspondence with the M symbol sets, and the sub-identifier indicates whether symbol polarity inversion is performed on each symbol subset in a corresponding symbol set.
The method according to claim 1, wherein inverting the polarity of the at least one symbol in the at least one symbol set comprises: performing polarity inversion on a symbol in each symbol set separately in K manners, to obtain K symbol sets, wherein K is an integer greater than 1; obtaining K frequency characteristic parameters respectively corresponding to the K symbol sets obtained through the polarity inversion, wherein the K frequency characteristic parameters are all related to the target frequency; and determining a symbol set corresponding to a frequency characteristic parameter whose modulus value is the smallest in the K frequency characteristic parameters.
The method according to claim 13, wherein a frequency characteristic parameter corresponding to any one of the K symbol sets obtained through the polarity inversion is represented as: ∑ s j ∈ C D q U k s j × e − i × 2 π × f Baudrate × j + q − 1 × N + P − ∑ s j ∈ U k s j × e − i × 2 π × f Baudrate × j + q − 1 × N + P wherein S represents a symbol in the symbol set, i represents an imaginary part of a complex number, j represents a sequence number of the symbol in the symbol set, f represents the target frequency, Baudrate represents a baud rate for transmitting the second modulated signal and the identification information, q represents a sequence number of the symbol set, D q represents a q th symbol set, N represents a quantity of symbols in the symbol set, P represents a length of identification information corresponding to the symbol set, U k represents a symbol whose polarity is inverted in the q th symbol set, and C D q U k represents a symbol whose polarity remains unchanged in the q th symbol set.
The method according to claim 13 or 14, wherein the identification information comprises M sub-identifiers that are in one-to-one correspondence with the M symbol sets, and the sub-identifier indicates a symbol polarity inversion manner used for a corresponding symbol set.
The method according to any one of claims 1 to 15, wherein the identification information comprises the M sub-identifiers interleaved in the M symbol sets, and the M sub-identifiers are in one-to-one correspondence with the M symbol sets.
The method according to any one of claims 1 to 16, wherein after generating the identification information, the method further comprises: performing forward error correction FEC encoding on the identification information.
A signal processing method, comprising: receiving a first signal and identification information that are sent by a transmitter through a channel; filtering out a partial signal at a target frequency in the first signal to obtain a second signal, wherein the second signal comprises M symbol sets, each symbol set comprises N symbols, M is an integer greater than 1, N is an integer greater than 1, and the identification information indicates polarity inversion statuses of the symbols in each symbol set; and inverting a polarity of at least one symbol in at least one symbol set based on the identification information to obtain a third signal comprising M×N symbols.
The method according to claim 18, wherein the identification information comprises M sub-identifiers interleaved in the M symbol sets, and the M sub-identifiers are in one-to-one correspondence with the M symbol sets.
A chip, wherein the chip comprises a processor and a memory, the memory and the processor are connected to each other through a line, the memory stores instructions, and the processor is configured to perform the method according to any one of claims 1 to 19.

Description

This application claims priority to Chinese Patent Application No. 202311035417.7, filed with the China National Intellectual Property Administration on August 15, 2023 and entitled "SIGNAL PROCESSING METHOD AND RELATED APPARATUS", which is incorporated herein by reference in its entirety. TECHNICAL FIELD Embodiments of this application relate to the communication field, and in particular, to a signal processing method and a related apparatus. BACKGROUND In actual deployment of a communication system, an impairment effect from a channel causes signal quality degradation, and a bit error rate of signals significantly increases. In this case, transmission performance of the communication system is limited. When frequencies of some interference or noise in the communication system overlap a signal frequency, a filter at a receiver cannot filter out the interference or noise because a frequency range of the filter is consistent with a signal frequency range. In this case, the interference or noise in a signal band deteriorates overall signal performance. SUMMARY Embodiments of this application provide a signal processing method and a related apparatus. A transmitter inverts polarities of some symbols in a to-be-sent signal based on a target frequency, to implement power spectrum adjustment, so that power of a to-be-sent signal at the target frequency is suppressed, thereby helping resist impact of interference or noise on a channel on transmission performance. According to a first aspect, an embodiment of this application provides a signal processing method. The method is applied to a transmitter. Specifically, the transmitter obtains a first modulated signal, where the first modulated signal includes M symbol sets, each symbol set includes N symbols, and both M and N are integers greater than 1. For example, N is usually an integer multiple of 2. It should be understood that each symbol set may also be referred to as a symbol block (block), and each symbol in the block may include a plurality of bits. Then, the transmitter inverts a polarity of at least one symbol in at least one symbol set in the first modulated signal to obtain a second modulated signal including M×N symbols. Power of the second modulated signal at a target frequency is less than power of the first modulated signal at the target frequency. Next, the transmitter generates identification information, where the identification information indicates polarity inversion statuses of the symbols in each symbol set. Further, the transmitter sends the second modulated signal and the identification information. In this implementation, the transmitter adjusts a power spectrum of a to-be-sent signal based on a target frequency of interference or noise. Specifically, the transmitter inverts polarities of some symbols in the to-be-sent signal based on the target frequency, to implement power spectrum adjustment, so that power of a to-be-sent signal at the target frequency is suppressed, thereby helping resist impact of the interference or the noise on a channel on transmission performance. In other words, the transmitter may flexibly adjust the power spectrum of the to-be-sent signal based on an actual frequency of the interference or the noise, so that the to-be-sent signal does not overlap the interference or the noise in frequency, and a receiver can effectively filter out the interference or the noise and cause no impairment to the signal from the transmitter. In addition, the transmitter further sends the identification information to the receiver, so that the receiver performs inverse transformation of power spectrum adjustment on a received signal based on the identification information, to restore the original signal that is before the transmitter performs power spectrum adjustment. In some possible implementations, inverting the polarity of the at least one symbol in the at least one symbol set includes: inverting polarities of all symbols in the at least one symbol set. In other words, the inversion manner used herein is to invert the polarities of all the symbols in the symbol set as a whole. This implementation is simpler. In some possible implementations, inverting the polarity of the at least one symbol in the at least one symbol set includes: if polarities of all symbols in a qth symbol set remain unchanged, determining a frequency characteristic parameter corresponding to each of a 0th symbol set to the qth symbol set, and performing summation on frequency characteristic parameters corresponding to all of the 0th symbol set to the qth symbol set and performing a modulo operation, to obtain a first summation value, where 0<q≤M-1, and the frequency characteristic parameter corresponding to each symbol set is related to the target frequency; or if polarities of all symbols in a qth symbol set are inverted, determining, based on the target frequency, a frequency characteristic parameter corresponding to each of a 0th symbol set to the qth symbol