CN114554525A - Signal processing method, signal processing apparatus, electronic device, storage medium, and program product - Google Patents
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Abstract
The application provides a signal processing method, a signal processing device, an electronic device, a storage medium and a program product, and relates to the technical field of communication. The method compensates the phase ambiguity problem caused by down sampling of the local main synchronizing signal by performing phase compensation on one of the local main synchronizing signal and the received main synchronizing signal after down sampling, so that the problem of peak loss caused by the phase ambiguity of the received main synchronizing signal can be avoided when the two signals perform correlation operation after the phase compensation on one of the local main synchronizing signal and the received main synchronizing signal.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a signal processing method, an apparatus, an electronic device, a storage medium, and a program product.
Background
In a communication system, a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH) are jointly combined into a Synchronization Signal Block (SSB), wherein the PSS carries intra-cell group ID information. In the initial cell access process, the terminal detects the PSS to obtain the ID in the cell group, and the currently adopted mode is to perform a cross-correlation method on the received sequence and the local sequence to search the peak position.
After the low-pass filtering is performed on the receiving sequence, the receiving sequence is influenced by the down-sampling of the low-pass filtering, and the filtered receiving sequence generates phase ambiguity, so that peak value loss is caused, and a subsequent peak value detection result is influenced to a certain extent.
Disclosure of Invention
An object of the embodiments of the present application is to provide a signal processing method, a signal processing apparatus, an electronic device, a storage medium, and a program product, so as to solve the problem of peak loss caused by phase ambiguity of a received sequence due to down-sampling in the prior art.
In a first aspect, an embodiment of the present application provides a signal processing method, where the method includes:
performing phase compensation on a signal to be compensated to obtain a compensated signal, wherein the signal to be compensated is one of a local main synchronous signal and a received main synchronous signal after down sampling;
performing a correlation operation on the compensated signal and an uncompensated signal to obtain a correlation result, wherein the uncompensated signal is the other signal which is not subjected to phase compensation in the local main synchronous signal and the received main synchronous signal;
and carrying out peak value detection on the correlation result to obtain peak value correlation information.
In the implementation process, one of the local main synchronization signal and the received main synchronization signal after down sampling is subjected to phase compensation to compensate the problem of phase ambiguity of the received local main synchronization signal caused by down sampling, so that when one of the two signals is subjected to phase compensation, the problem of peak loss caused by the phase ambiguity of the received main synchronization signal is avoided when the two signals are subjected to correlation operation, the scheme can detect the peak position more accurately, and further can accurately obtain the ID in the cell group from the information carried by the received main synchronization signal.
Optionally, the performing a correlation operation on the compensated signal and an uncompensated signal to obtain a correlation result includes:
and carrying out time domain correlation operation on the compensated signal and the uncompensated signal to obtain a time domain correlation result. And the correlation operation is carried out on the time domain, so that the peak value detection can be directly carried out according to the time domain correlation result, and the method is more convenient.
Optionally, when the signal to be compensated is a time domain signal, performing fractional delay processing on the signal to be compensated, or performing FFT on the signal to be compensated and then performing fractional phase offset and then performing IFFT on the signal to be compensated to obtain the compensated signal;
and/or the presence of a gas in the gas,
and when the signal to be compensated is a frequency domain signal, carrying out fractional phase offset on the signal to be compensated and then carrying out IFFT, or carrying out fractional delay processing on the signal to be compensated after carrying out IFFT to obtain the compensated signal.
In the implementation process, different phase compensation schemes are selected for phase compensation aiming at the signals to be compensated which are frequency domain signals or time domain signals, so that the equivalent phase compensation effect can be realized under the condition of time domain correlation operation, and therefore, the corresponding phase compensation method can be flexibly selected for compensation no matter whether the signals to be compensated are time domain signals or frequency domain signals.
Optionally, the performing a correlation operation on the compensated signal and an uncompensated signal to obtain a correlation result includes:
and carrying out frequency domain correlation operation on the compensated signal and the uncompensated signal to obtain a frequency domain correlation result. The correlation operation is selected to be performed in the frequency domain so that the phase compensation mode can be selected more flexibly.
Optionally, when the signal to be compensated is a time domain signal, performing fractional delay processing on the signal to be compensated and then performing FFT, or performing fractional phase offset after performing FFT on the signal to be compensated and then obtaining the compensated signal;
and/or the presence of a gas in the gas,
and when the signal to be compensated is a frequency domain signal, carrying out fractional phase offset on the signal to be compensated, or carrying out IFFT on the signal to be compensated, then carrying out fractional delay processing and then carrying out FFT on the signal to be compensated so as to obtain the compensated signal.
In the implementation process, different phase compensation schemes are selected for phase compensation aiming at the signals to be compensated which are frequency domain signals or time domain signals, so that the equivalent phase compensation effect can be realized under the condition of frequency domain correlation operation, and therefore, the corresponding phase compensation method can be flexibly selected for compensation no matter whether the signals to be compensated are time domain signals or frequency domain signals.
Optionally, the step of performing phase compensation on the signal to be compensated to obtain a compensated signal includes:
performing multiple phase compensations on the target local main synchronous signal to obtain multiple candidate compensated signals;
performing phase compensation on the other local main synchronous signals according to the phase compensation corresponding to the target compensated signal to obtain other compensated signals; the target compensated signal is a candidate compensated signal corresponding to a correlation result with a maximum peak value detected in a plurality of correlation results obtained after the correlation operation is respectively performed on the plurality of candidate compensated signals and the uncompensated signal;
and/or the presence of a gas in the gas,
the phase compensation is performed on the signal to be compensated to obtain a compensated signal, and the method comprises the following steps:
performing multiple phase compensation on the signal to be compensated to obtain multiple compensated signals;
the performing a correlation operation on the compensated signal and the uncompensated signal to obtain a correlation result includes:
respectively carrying out correlation operation on the obtained compensated signals and the uncompensated signals to obtain a plurality of correlation results;
the performing peak detection on the correlation result to obtain peak correlation information includes:
performing peak detection on each correlation result to obtain a plurality of peak correlation information;
and screening the peak value related information corresponding to the maximum peak value from the plurality of peak value related information.
In the implementation process, the phase compensation is performed on other local main synchronous signals according to the phase compensation corresponding to the target compensated signal, so that a plurality of phase compensations are not required to be performed on all local main synchronous signals, and the calculation amount of the phase compensation can be effectively reduced.
In a second aspect, an embodiment of the present application provides a signal processing apparatus, including:
the compensation module is used for carrying out phase compensation on a signal to be compensated to obtain a compensated signal, wherein the signal to be compensated is one of a local main synchronous signal and a received main synchronous signal after down sampling;
a correlation operation module, configured to perform correlation operation on the compensated signal and an uncompensated signal to obtain a correlation result, where the uncompensated signal is another signal of the local primary synchronization signal and the received primary synchronization signal that is not subjected to phase compensation;
and the peak value detection module is used for carrying out peak value detection on the correlation result to obtain peak value correlation information.
In a third aspect, an embodiment of the present application provides an electronic device, which includes a processor and a memory, where the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the steps in the method as provided in the first aspect are executed.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, performs the steps in the method as provided in the first aspect above.
In a fifth aspect, embodiments of the present application provide a computer program product, which includes computer program instructions, when read and executed by a processor, for performing the steps in the method as provided in the first aspect.
Additional features and advantages of the present application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the present application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a flowchart of a signal processing method according to an embodiment of the present application;
fig. 2 is a schematic flowchart of a first delay processing for performing fractional-fold on a signal to be compensated according to an embodiment of the present disclosure;
fig. 3 is a schematic flowchart of a second delay processing for performing fractional-fold on a signal to be compensated according to an embodiment of the present application;
fig. 4 is a schematic flowchart of a first method for fractional phase offset of a signal to be compensated according to an embodiment of the present disclosure;
fig. 5 is a schematic flowchart of a second method for fractional phase shift of a signal to be compensated according to an embodiment of the present disclosure;
fig. 6 is a schematic flowchart of a third method for fractional phase shift of a signal to be compensated according to an embodiment of the present disclosure;
fig. 7 is a schematic flowchart of a fourth method for fractional phase shift of a signal to be compensated according to an embodiment of the present application;
fig. 8 is a schematic flowchart of a third delay processing for performing fractional-fold on a signal to be compensated according to an embodiment of the present application;
fig. 9 is a schematic flowchart of a fourth delay processing for performing fractional-fold on a signal to be compensated according to an embodiment of the present application;
fig. 10 is a schematic flowchart of a frequency domain correlation operation according to an embodiment of the present disclosure;
fig. 11 is a block diagram of a signal processing apparatus according to an embodiment of the present disclosure;
fig. 12 is a schematic structural diagram of an electronic device for executing a signal processing method according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
It should be noted that the terms "system" and "network" in the embodiments of the present invention may be used interchangeably. The "plurality" means two or more, and in view of this, the "plurality" may also be understood as "at least two" in the embodiments of the present invention. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" generally indicates that the preceding and following related objects are in an "or" relationship, unless otherwise specified.
The embodiment of the application provides a signal processing method, which performs phase compensation on one of a local main synchronization signal and a received main synchronization signal after down sampling to compensate the problem of phase ambiguity caused by the down sampling of the received local main synchronization signal, so that when one of the two signals is subjected to phase compensation, the problem of peak loss caused by the phase ambiguity of the received main synchronization signal is avoided when the two signals are subjected to correlation operation.
Referring to fig. 1, fig. 1 is a flowchart of a signal processing method according to an embodiment of the present disclosure, where the method includes the following steps:
step S110: and performing phase compensation on the signal to be compensated to obtain a compensated signal.
The signal to be compensated is one of a local primary synchronization signal and a received primary synchronization signal after down-sampling, that is, the signal to be compensated may be a local primary synchronization signal (for convenience of description, in the following embodiments, it is simply referred to as a local PSS), or may be a received primary synchronization signal after down-sampling (for convenience of description, in the following embodiments, it is simply referred to as a received PSS).
The receiving PSS is contained in the SSB, after the SSB is received by the terminal, the SSB is subjected to down-sampling through a low-pass filter to obtain the SSB after down-sampling, wherein the SSB comprises the receiving PSS after down-sampling, the sampling rate of the receiving PSS after down-sampling is the same as that of the local PSS, and if the local PSS is one-time sampling rate, the receiving PSS is also one-time sampling rate, so the down-sampling times of the receiving PSS can be determined according to the sampling rate of the local PSS, and the number of the low-pass filters and the down-sampling times can also be determined according to the sampling rate of the local PSS and the sampling rate of the receiving PSS before down-sampling.
Step S120: and carrying out correlation operation on the compensated signal and the uncompensated signal to obtain a correlation result.
The uncompensated signal is the other signal of the local PSS and the receiving PSS, which is not subjected to phase compensation, for example, if the signal to be compensated is the local PSS, the uncompensated signal is the receiving PSS, and conversely, if the signal to be compensated is the receiving PSS, the uncompensated signal is the local PSS.
The correlation operation may be sliding correlation, or some other correlation algorithms are used for performing the correlation operation, if the signal to be compensated is the receiving PSS, the compensated signal is the compensated receiving PSS, and the uncompensated signal is the local PSS, at this time, the compensated receiving PSS and the local PSS may be subjected to the correlation operation to obtain the correlation result.
Step S130: and carrying out peak value detection on the correlation result to obtain peak value correlation information.
It should be understood that the correlation result refers to a correlated signal after correlation, and peak detection is performed on the correlation result, which may be understood as peak detection performed on the correlation signal, so that peak correlation information may be obtained, where the peak correlation information includes information such as a peak position and a peak value, so that the terminal may determine ID information and the like in a cell group according to the peak correlation information.
For example, a local PSS typically has three signals, corresponding to three sequence numbers: 0,1,2, corresponding to the intra-cell group ID: and 0,1,2, if the compensated receiving PSS and the three local PSSs are respectively subjected to correlation operation, three correlation results can be obtained, then peak values in the three correlation results are respectively detected, correlation information of the three peak values is obtained, if the three peak values can be obtained, the three peak values are compared, the maximum peak value is selected, the serial number corresponding to the local PSS corresponding to the maximum peak value is the ID in the cell group, and if the serial number of the local PSS corresponding to the maximum peak value is 1, the ID in the cell group carried in the receiving PSS obtained by the demodulation is 1.
It can be understood that, if the signal to be compensated is the local PSS, phase compensation may be performed on the three local PSS respectively to obtain three compensated signals, then correlation operation is performed on each compensated signal with the received PSS respectively to obtain three correlation results, and peak values of the three correlation results are detected respectively, so as to determine that the sequence number corresponding to the local PSS corresponding to the maximum peak value is the intra-cell group ID.
In the implementation process, one of the local main synchronization signal and the received main synchronization signal after down sampling is subjected to phase compensation to compensate the problem of phase ambiguity of the received local main synchronization signal caused by down sampling, so that when one of the two signals is subjected to phase compensation, the problem of peak loss caused by the phase ambiguity of the received main synchronization signal is avoided when the two signals are subjected to correlation operation, and the scheme can more accurately detect the peak position.
On the basis of the above embodiment, when performing correlation operation on the compensated signal and the uncompensated signal, time-domain correlation operation may be performed on the compensated signal and the uncompensated signal to obtain a time-domain correlation result. And the correlation operation is carried out on the time domain, so that the peak value detection can be directly carried out according to the time domain correlation result, and the method is more convenient.
And if the compensated signal or the uncompensated signal is a frequency domain signal, converting the compensated signal or the uncompensated signal into a time domain and then performing correlation operation.
In some embodiments, under the time domain correlation operation, the phase compensation method may be as follows: if the signal to be compensated is a time domain signal, performing fractional delay processing on the signal to be compensated, or performing Fast Fourier Transform (FFT) on the signal to be compensated, then performing fractional phase offset, and then performing Inverse Fast Fourier Transform (IFFT) on the signal to be compensated, so as to obtain a compensated signal.
Referring to fig. 2, fig. 2 is a schematic flow chart illustrating a fractional delay process performed on a signal to be compensated when the signal to be compensated is a time domain signal. If the signal to be compensated shown in fig. 2 is the local PSS, a fractional delay process is performed on the local PSS in the time domain to obtain a compensated signal, and then the receiving PSS after downsampling through the low-pass filter is subjected to correlation operation with the compensated signal, at this time, the received PSS after downsampling is also a time domain signal, the correlation operation is time domain correlation operation, and the obtained correlation result is also a time domain correlation result.
It can be understood that the signal to be compensated may also be a receiving PSS, as shown in fig. 3, a delay processing of a fractional multiple is performed on the receiving PSS after being down-sampled by a low-pass filter in a time domain to obtain a compensated signal, and then a correlation operation is performed on a local PSS (in this case, the local PSS is a time domain signal) and the compensated signal to obtain a time domain correlation result.
Referring to fig. 4, fig. 4 is a schematic flow chart of performing FFT on a signal to be compensated, then performing fractional phase shift on the signal to be compensated, and then performing IFFT on the signal to be compensated. The signal to be compensated shown in fig. 4 is a local PSS, and at this time, the local PSS is a time domain signal, and after FFT conversion of the local PSS to a frequency domain is performed, fractional phase offset is performed first, and then IFFT is performed, so as to obtain a compensated signal. And then, carrying out correlation operation on the receiving PSS (time domain signal at the moment) subjected to down sampling by the low-pass filter and the compensated signal to obtain a time domain correlation result.
It can be understood that the signal to be compensated may also be a receiving PSS, as shown in fig. 5, the receiving PSS after being down-sampled by the low-pass filter is first FFT-converted into a frequency domain, then phase shift by a fraction is performed, then IFFT is performed to convert into a time domain to obtain a compensated signal, and then a correlation operation is performed between the local PSS (in this case, the local PSS is a time domain signal) and the compensated signal to obtain a time domain correlation result.
In other embodiments, in the time domain correlation operation, the phase compensation may be performed by: if the signal to be compensated is a frequency domain signal, the signal to be compensated is subjected to fractional phase offset and then subjected to IFFT, or the signal to be compensated is subjected to IFFT and then subjected to fractional delay processing, so as to obtain a compensated signal.
Referring to fig. 6, fig. 6 is a schematic flow chart of performing IFFT after fractional phase offset is performed on a signal to be compensated when the signal to be compensated is a frequency domain signal. If the signal to be compensated shown in fig. 6 is the local PSS, then the local PSS is subjected to fractional phase offset on the frequency domain, and then IFFT is performed to convert the phase offset to the time domain, so as to obtain a compensated signal, and then correlation operation is performed on the received PSS subjected to down-sampling by the low-pass filter and the compensated signal, at this time, the received PSS subjected to down-sampling is also a time domain signal, the correlation operation is time domain correlation operation, and the obtained correlation result is also a time domain correlation result.
It can be understood that the signal to be compensated may also be a receiving PSS, as shown in fig. 7, the receiving PSS after being down-sampled by the low-pass filter is subjected to fractional phase offset on the frequency domain, and then is subjected to IFFT to convert into the time domain to obtain a compensated signal, and then a correlation operation is performed on the local PSS (in this case, the local PSS is a time domain signal) and the compensated signal to obtain a time domain correlation result.
Referring to fig. 8, fig. 8 is a schematic flow chart illustrating a procedure of performing a fractional delay process after performing IFFT on a signal to be compensated when the signal to be compensated is a frequency domain signal. The signal to be compensated shown in fig. 8 is a local PSS, and at this time, the local PSS is a frequency domain signal, and after IFFT is performed on the local PSS, a fractional delay processing may be performed to obtain a compensated signal. And then, carrying out correlation operation on the receiving PSS (time domain signal at the moment) subjected to down sampling by the low-pass filter and the compensated signal to obtain a time domain correlation result.
It can be understood that the signal to be compensated may also be a receiving PSS, as shown in fig. 9, the receiving PSS after being down-sampled by the low-pass filter is first subjected to IFFT (if the receiving PSS after being down-sampled is a time domain signal, it is needless to perform IFFT), then delayed by a fraction of times to obtain a compensated signal, and then the local PSS (in this case, the local PSS is a time domain signal) and the compensated signal are subjected to correlation operation to obtain a time domain correlation result.
That is to say, in the time domain correlation operation, the effect of phase compensation can be achieved by performing fractional delay processing on the signal to be compensated in the time domain and performing fractional phase offset on the signal to be compensated in the frequency domain.
In the implementation process, different phase compensation schemes are selected for phase compensation aiming at the signals to be compensated which are frequency domain signals or time domain signals, so that the equivalent phase compensation effect can be realized under the condition of time domain correlation operation, and therefore, the corresponding phase compensation method can be flexibly selected for compensation no matter whether the signals to be compensated are time domain signals or frequency domain signals.
In addition, when the compensated signal and the uncompensated signal are correlated, the compensated signal and the uncompensated signal may be subjected to frequency domain correlation to obtain a frequency domain correlation result.
And if the compensated signal or the uncompensated signal is a time domain signal, converting the compensated signal or the uncompensated signal into a frequency domain and then performing correlation operation.
Similarly, under the frequency domain correlation operation, the phase compensation method may be: if the signal to be compensated is a time domain signal, performing fractional delay processing on the signal to be compensated and then performing FFT to obtain a compensated signal, or performing fractional phase shift on the signal to be compensated and then performing fractional phase shift to obtain a compensated signal.
In other embodiments, in the frequency domain correlation operation, the phase compensation may be performed by: if the signal to be compensated is a frequency domain signal, performing fractional phase offset on the signal to be compensated to obtain a compensated signal, or performing IFFT on the signal to be compensated, performing fractional delay processing and then performing FFT on the signal to be compensated to obtain the compensated signal.
That is, the phase compensation in the frequency domain is fractional phase offset, the phase compensation in the time domain is fractional delay processing, both can achieve equivalent phase compensation effects, and during the frequency domain correlation operation or the time domain correlation operation, only the signal needs to be converted into the frequency domain or the time domain, which is similar to various compensation modes under the above-mentioned middle time domain correlation operation, only finally during the correlation operation, the signal is converted into the frequency domain for operation, and for the sake of brevity of description, repeated description is omitted here.
In the implementation process, different phase compensation schemes are selected for phase compensation aiming at the signals to be compensated which are frequency domain signals or time domain signals, so that the equivalent phase compensation effect can be realized under the condition of frequency domain correlation operation, and therefore, the corresponding phase compensation method can be flexibly selected for compensation no matter whether the signals to be compensated are time domain signals or frequency domain signals.
In the above embodiment, the delay processing of the signal to be compensated by a fraction is understood to be the delay processing of the signal to be compensated by a fraction in the time domain by a fractional delay filter. The fractional delay filter can adopt an FIR fractional delay filter, and the main idea is to design the coefficient of the filter as fractional delay amount so that fractional delay can be performed on the sampling point of the signal, if the fractional delay amount is 0.75, the signal to be compensated is delayed by X +0.75 points (namely 0.75 time delay processing) on the time domain through the fractional time domain filter, wherein X is the order of the fractional delay filter. In practical application, the fractional multiple value can be flexibly set according to actual requirements, such as 0.25 time, 0.5 time and the like. Or, a plurality of values may be taken each time, for example, 0.25,0.5, and 0.75, the signal to be compensated may be subjected to delay processing of X +0.25, the signal to be compensated may be subjected to delay processing of X +0.5, and the signal to be compensated may be subjected to delay processing of X +0.75, at this time, three compensated signals may be obtained, and then, the three compensated signals may be respectively subjected to correlation operation with the uncompensated signal, so as to obtain three correlation results.
The fractional phase offset of the signal to be compensated can be understood as fractional compensation of the phase of the signal to be compensated, and a calculation formula of the fractional phase offset of the signal to be compensated is as follows:
wherein, x (k) represents the frequency domain signal to be compensated (such as frequency domain local PSS or frequency domain receiving PSS), k represents the subcarrier sequence number, xPSS(n) represents the compensated signal, M represents the number of IFFT points, n0The value of (d) represents a fractional phase offset.
In some embodiments, n is0Is less than 1, i.e. n0May take on a value of (-1, 1). n is0Can be as n0E { -0.5, -0.25,0,0.25,0.5}, in the examples of the present application, n0At least one of these values may be taken.
Of course, n0The value of (2) can be selected from one of the most effective values through experiments, for example, the 5 values can be selected first, then fractional phase shift processing is performed on the signal to be compensated respectively to obtain 5 compensated signals, then correlation operation is performed on each compensated signal and the uncompensated signal respectively, at this moment, 5 correlation results can be obtained, then peak detection is performed on each correlation result respectively to obtain a correlation result corresponding to the maximum peak value, and n corresponding to the correlation result is performed0The value of (a) is taken as the best value, so that the value can be used for phase offset processing when phase compensation is carried out on subsequent signals.
Similarly, the above delay processing for fractional times is also similar, and a plurality of values may be taken first to perform fractional delay processing on a signal to be compensated to obtain a plurality of compensated signals, then each compensated signal is subjected to correlation operation with an uncompensated signal to obtain a plurality of correlation results, a maximum peak value is determined from the plurality of correlation results, and then a fractional value corresponding to the maximum peak value is determined, so that the value can be used as a most effective value, and the value can be used for subsequent signals to perform phase compensation processing.
In this case, in the fractional delay processing or fractional phase shift of the signal to be compensated, when the fractional value is multiple, it is equivalent to perform multiple phase compensation on the signal to be compensated to obtain multiple compensated signals, then perform correlation operation on the multiple compensated signals and the uncompensated signals respectively to obtain multiple correlation results, perform peak detection on each correlation result to obtain multiple peak correlation information, and then screen out the peak correlation information corresponding to the maximum peak from the multiple peak correlation information, so as to determine the intra-cell group ID according to the peak correlation information corresponding to the maximum peak.
For example, taking n as an example of fractional phase shift of the signal to be compensated, which is used as the local PSS0E { -0.5, -0.25,0,0.25,0.5}, and then after phase compensation is performed on the local PSS, 5 compensated signals are obtained
When performing correlation operation, firstly, the compensated signal is compared
Performing conjugation processing to obtain a conjugated signal
Here 5 conjugate signals are obtained. Then, each conjugate signal can be respectively subjected to sliding correlation with the receiving PSS to obtain a correlation result, which is calculated as follows:
wherein abs () represents an absolute value function, r (N) represents a received PSS, N represents a correlation length,
representing the initial correlation result, conv () representing a convolution function,
which represents the final correlation result, where 5 correlation results are obtained.
Then, peak detection is carried out on each correlation result, 5 peak values can be obtained, the maximum peak value is selected from the 5 peak values, and peak value correlation information corresponding to the maximum peak value is obtained.
In this embodiment, generally, there are three local PSS, and 5 phase compensations are performed for each local PSS, and at this time, 5 compensated signals are obtained for each local PSS, for example, a local PSS of a 0 sequence corresponds to 5 compensated signals, a local PSS of a 1 sequence corresponds to 5 compensated signals, a local PSS of a 2 sequence corresponds to 5 compensated signals, and then conjugate processing is performed for each compensated signal, at this time, 15 conjugate signals can be obtained, and then each conjugate signal is subjected to sliding correlation with the received PSS, and at this time, 15 correlation results are obtained. Then, the maximum peak is found from the 15 correlation results, for example, the local PSS with the maximum peak being 1 sequence is found at n0And if the value is 0.5, the cell group ID is determined to be 1 if the sliding correlation is determined with the receiving PSS.
It can be understood that, if the signal to be compensated is the received PSS, the processing may also be performed in the same manner, and for brevity of description, redundant description is omitted here.
When the phase compensation is performed in the frequency domain, the correlation operation may be to obtain a signal to be compensated, perform delay processing on the signal to be compensated in the time domain by a fractional multiple, obtain a compensated signal, obtain a time domain signal as the compensated signal, perform FFT on the compensated signal, convert the compensated signal to the frequency domain, perform conjugation processing on the frequency domain compensated signal, obtain a conjugate signal, perform dot multiplication on the conjugate signal and an uncompensated signal, obtain a correlation result, where the conjugate dot multiplication represents the correlation operation, and since the peak detection needs to be converted to the time domain, the peak detection needs to be performed after the IFFT conversion on the correlation result, and then the peak detection is performed after the IFFT conversion, as shown in fig. 10.
Therefore, the frequency domain correlation operation can be understood as conjugate point multiplication, and the time domain correlation operation can be understood as conjugate convolution. It is understood that the conjugate convolution in the time domain correlation operation shown in fig. 3-9 can be replaced by the conjugate multiplication + IFFT in the frequency domain correlation operation shown in fig. 10, wherein the signal is transformed into the corresponding time domain or frequency domain for processing only after IFFT or FFT transformation.
In addition, n is unknown0In which value the effect is best, n can be first selected0And taking a plurality of values to perform phase compensation, wherein if the 5 values are taken, the local PSS includes a target local PSS and other local PSS, wherein the target local PSS can be one of the local PSS, and if the target local PSS is a local PSS of a 1 sequence, the other local PSS includes a local PSS of a 0 sequence and a local PSS of a 2 sequence.
Multiple phase compensations (e.g., n) may then be performed for the target local PSS0Taking 5 values, namely performing 5 phase compensations), then obtaining a plurality of candidate compensated signals, performing phase compensation on other local PSS according to the phase compensation corresponding to the target compensated signal, and obtaining other compensated signals, wherein the target compensated signal is the candidate compensated signal corresponding to the correlation result of the maximum peak value detected in the plurality of correlation results obtained after the plurality of candidate compensated signals are respectively subjected to correlation operation with the uncompensated signal.
For example, if the target local PSS is a local PSS of 1 sequence, 5 phase compensations are performed on the target local PSS to obtain 5 candidate compensated signals, then correlation operation is performed on each candidate compensated signal and the received PSS to obtain 5 correlation results, peak detection is performed on each correlation result to obtain 5 peak correlation information, a maximum peak value is determined therefrom, and then a candidate compensated signal corresponding to the maximum peak value is determined. E.g. maximum peak value of n0And determining the candidate compensation signal as a target compensated signal according to a peak detection result obtained after the candidate compensation signal obtained when the value is 0.5 is correlated with the receiving PSS.
Then n can be utilized0Local PSS with values of 0.5 versus 0 sequence and local PSS with 2 sequenceThe ground PSS carries out phase compensation, namely the local PSS of the 0 sequence and the local PSS of the 2 sequence only need to carry out phase compensation once, and a plurality of phase compensations are not needed, so that the subsequent calculation amount can be effectively reduced. Thus at n0When the value is 0.5, performing phase compensation on the local PSS of the 0 sequence, performing phase compensation on the local PSS of the 2 sequence, then obtaining two compensated signals, performing correlation operation on the two compensated signals and the received PSS respectively to obtain 2 correlation results, performing peak detection on each correlation result to obtain 2 peak correlation information, comparing the peak correlation information of the maximum peak (serving as the peak detection result corresponding to the local PSS of the 1 sequence) with the maximum peak in the 2 peak correlation information, and then determining the intra-cell ID according to the maximum peak, wherein if the local PSS corresponding to the finally determined maximum peak is the sequence 0, the intra-cell ID is 0.
In the implementation process, the phase compensation is performed on other local main synchronous signals according to the phase compensation corresponding to the target compensated signal, so that a plurality of phase compensations are not required to be performed on all local main synchronous signals, and the calculation amount of the phase compensation can be effectively reduced.
Referring to fig. 11, fig. 11 is a block diagram of a signal processing apparatus 200 according to an embodiment of the present disclosure, where the apparatus 200 may be a module, a program segment, or a code on an electronic device. It should be understood that the apparatus 200 corresponds to the above-mentioned embodiment of the method of fig. 1, and can perform various steps related to the embodiment of the method of fig. 1, and the specific functions of the apparatus 200 can be referred to the above description, and the detailed description is appropriately omitted here to avoid redundancy.
Optionally, the apparatus 200 comprises:
the compensation module 210 is configured to perform phase compensation on a signal to be compensated to obtain a compensated signal, where the signal to be compensated is one of a local main synchronization signal and a received main synchronization signal after down-sampling;
a correlation operation module 220, configured to perform a correlation operation on the compensated signal and an uncompensated signal to obtain a correlation result, where the uncompensated signal is another signal of the local primary synchronization signal and the received primary synchronization signal that is not subjected to phase compensation;
and a peak detection module 230, configured to perform peak detection on the correlation result to obtain peak correlation information.
Optionally, the correlation operation module 220 is configured to perform time-domain correlation operation on the compensated signal and the uncompensated signal to obtain a time-domain correlation result.
Optionally, when the signal to be compensated is a time domain signal, performing fractional delay processing on the signal to be compensated, or performing FFT on the signal to be compensated and then performing fractional phase offset and then performing IFFT on the signal to be compensated to obtain the compensated signal;
and/or the presence of a gas in the gas,
and when the signal to be compensated is a frequency domain signal, carrying out fractional phase offset on the signal to be compensated and then carrying out IFFT, or carrying out fractional delay processing on the signal to be compensated after carrying out IFFT to obtain the compensated signal.
Optionally, the correlation operation module 220 is configured to perform frequency domain correlation operation on the compensated signal and the uncompensated signal to obtain a frequency domain correlation result.
Optionally, when the signal to be compensated is a time domain signal, performing fractional delay processing on the signal to be compensated and then performing FFT, or performing fractional phase offset on the signal to be compensated after performing FFT, so as to obtain the compensated signal;
and/or the presence of a gas in the gas,
and when the signal to be compensated is a frequency domain signal, carrying out fractional phase offset on the signal to be compensated, or carrying out IFFT on the signal to be compensated, then carrying out fractional delay processing and then carrying out FFT on the signal to be compensated so as to obtain the compensated signal.
Optionally, the local master synchronization signal includes a target local master synchronization signal and other local master synchronization signals, and the compensation module 210 is configured to perform multiple phase compensations on the target local master synchronization signal to obtain multiple candidate compensated signals; performing phase compensation on the other local main synchronous signals according to the phase compensation corresponding to the target compensated signal to obtain other compensated signals; the target compensated signal is a candidate compensated signal corresponding to a correlation result with a maximum peak value detected in a plurality of correlation results obtained after the correlation operation is respectively performed on the plurality of candidate compensated signals and the uncompensated signal;
and/or the presence of a gas in the gas,
the compensation module 210 is configured to perform multiple phase compensations on the signal to be compensated to obtain multiple compensated signals;
the correlation operation module 220 is configured to perform correlation operation on the obtained compensated signals and the uncompensated signals respectively to obtain a plurality of correlation results;
the peak detection module 230 is configured to perform peak detection on each correlation result to obtain multiple peak correlation information; and screening the peak value related information corresponding to the maximum peak value from the plurality of peak value related information.
It should be noted that, for the convenience and brevity of description, the specific working procedure of the above-described apparatus may refer to the corresponding procedure in the foregoing method embodiment, and the description is not repeated herein.
Referring to fig. 12, fig. 12 is a schematic structural diagram of an electronic device for executing a signal processing method according to an embodiment of the present disclosure, where the electronic device may include: at least one processor 310, such as a CPU, at least one communication interface 320, at least one memory 330, and at least one communication bus 340. Wherein the communication bus 340 is used for realizing direct connection communication of these components. The communication interface 320 of the device in the embodiment of the present application is used for performing signaling or data communication with other node devices. The memory 330 may be a high-speed RAM memory or a non-volatile memory (e.g., at least one disk memory). The memory 330 may optionally be at least one memory device located remotely from the aforementioned processor. The memory 330 stores computer readable instructions, which when executed by the processor 310, cause the electronic device to perform the method processes described above with reference to fig. 1.
It will be appreciated that the configuration shown in fig. 12 is merely illustrative and that the electronic device may include more or fewer components than shown in fig. 12 or have a different configuration than shown in fig. 12. The components shown in fig. 12 may be implemented in hardware, software, or a combination thereof.
Embodiments of the present application provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, performs the method processes performed by an electronic device in the method embodiment shown in fig. 1.
The present embodiments disclose a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the methods provided by the above-described method embodiments, for example, comprising: performing phase compensation on a signal to be compensated to obtain a compensated signal, wherein the signal to be compensated is one of a local main synchronous signal and a received main synchronous signal after down sampling; performing a correlation operation on the compensated signal and an uncompensated signal to obtain a correlation result, wherein the uncompensated signal is the other signal which is not subjected to phase compensation in the local main synchronous signal and the received main synchronous signal; and carrying out peak value detection on the correlation result to obtain peak value correlation information.
In summary, the embodiments of the present application provide a signal processing method, an apparatus, an electronic device, a storage medium, and a program product, in which a phase compensation is performed on one of a local main synchronization signal and a received main synchronization signal after down-sampling to compensate for a problem of phase ambiguity of the received local main synchronization signal due to the down-sampling, so that after the phase compensation is performed on one of the local main synchronization signal and the received main synchronization signal, a problem of peak loss due to the phase ambiguity of the received main synchronization signal can be avoided when performing correlation operation on the two signals.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some communication interfaces, indirect coupling or communication connection between devices or units, and may be in an electrical, mechanical or other form.
In addition, units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist alone, or two or more modules may be integrated to form an independent part.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A method of signal processing, the method comprising:
performing phase compensation on a signal to be compensated to obtain a compensated signal, wherein the signal to be compensated is one of a local main synchronous signal and a received main synchronous signal after down sampling;
performing a correlation operation on the compensated signal and an uncompensated signal to obtain a correlation result, wherein the uncompensated signal is the other signal which is not subjected to phase compensation in the local main synchronous signal and the received main synchronous signal;
and carrying out peak value detection on the correlation result to obtain peak value correlation information.
2. The method of claim 1, wherein correlating the compensated signal with an uncompensated signal to obtain a correlation result comprises:
and carrying out time domain correlation operation on the compensated signal and the uncompensated signal to obtain a time domain correlation result.
3. The method according to claim 2, wherein when the signal to be compensated is a time domain signal, the signal to be compensated is subjected to fractional delay processing, or after FFT, the signal to be compensated is subjected to fractional phase shift and then to IFFT, so as to obtain the compensated signal;
and/or the presence of a gas in the gas,
and when the signal to be compensated is a frequency domain signal, carrying out fractional phase offset on the signal to be compensated and then carrying out IFFT, or carrying out fractional delay processing on the signal to be compensated after carrying out IFFT to obtain the compensated signal.
4. The method of claim 1, wherein correlating the compensated signal with an uncompensated signal to obtain a correlation result comprises:
and carrying out frequency domain correlation operation on the compensated signal and the uncompensated signal to obtain a frequency domain correlation result.
5. The method according to claim 4, wherein when the signal to be compensated is a time domain signal, performing fractional delay processing on the signal to be compensated and then performing FFT, or performing fractional phase offset on the signal to be compensated after performing FFT, so as to obtain the compensated signal;
and/or the presence of a gas in the gas,
and when the signal to be compensated is a frequency domain signal, carrying out fractional phase offset on the signal to be compensated, or carrying out IFFT on the signal to be compensated, then carrying out fractional delay processing and then carrying out FFT on the signal to be compensated so as to obtain the compensated signal.
6. The method according to any one of claims 2 to 5, wherein the local master synchronization signal comprises a target local master synchronization signal and other local master synchronization signals, and the phase compensating the signal to be compensated to obtain a compensated signal comprises:
performing multiple phase compensations on the target local main synchronizing signal to obtain multiple candidate compensated signals;
performing phase compensation on the other local main synchronous signals according to the phase compensation corresponding to the target compensated signal to obtain other compensated signals; the target compensated signal is a candidate compensated signal corresponding to a correlation result with a maximum peak value detected in a plurality of correlation results obtained after the plurality of candidate compensated signals are respectively subjected to correlation operation with the uncompensated signal;
and/or the presence of a gas in the gas,
the phase compensation is performed on the signal to be compensated to obtain a compensated signal, and the method comprises the following steps:
performing a plurality of phase compensations on the signal to be compensated to obtain a plurality of compensated signals;
the performing a correlation operation on the compensated signal and the uncompensated signal to obtain a correlation result includes:
respectively carrying out correlation operation on the obtained compensated signals and the uncompensated signals to obtain a plurality of correlation results;
the performing peak detection on the correlation result to obtain peak correlation information includes:
performing peak detection on each correlation result to obtain a plurality of peak correlation information;
and screening the peak value related information corresponding to the maximum peak value from the plurality of peak value related information.
7. A signal processing apparatus, characterized in that the apparatus comprises:
the compensation module is used for carrying out phase compensation on a signal to be compensated to obtain a compensated signal, wherein the signal to be compensated is one of a local main synchronous signal and a received main synchronous signal after down sampling;
a correlation operation module, configured to perform correlation operation on the compensated signal and an uncompensated signal to obtain a correlation result, where the uncompensated signal is another signal of the local primary synchronization signal and the received primary synchronization signal that is not subjected to phase compensation;
and the peak value detection module is used for carrying out peak value detection on the correlation result to obtain peak value correlation information.
8. An electronic device comprising a processor and a memory, the memory storing computer readable instructions that, when executed by the processor, perform the method of any of claims 1-6.
9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1-6.
10. A computer program product comprising computer program instructions which, when read and executed by a processor, perform the method of any one of claims 1 to 6.
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