CN112929959B - Signal processing method, signal processing device, computer equipment and storage medium - Google Patents
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Abstract
The present application relates to a signal processing method, apparatus, computer device and storage medium. The method comprises the following steps: receiving empty signals of a plurality of synchronous signal blocks sent by a base station, wherein each synchronous signal block corresponds to a first demodulation reference signal; generating a plurality of different local demodulation reference signals according to a preset communication protocol; phase removal is carried out on the first demodulation reference signals of the synchronous signal blocks by adopting the local demodulation reference signals to obtain second demodulation reference signals; performing correlation operation on each second demodulation reference signal and each local demodulation reference signal to obtain each correlation result; and screening out the target synchronous signal block according to each correlation result. The phase deviation is eliminated from the first demodulation reference signal through the generated local demodulation reference signals, signal correlation is executed after the phase deviation is eliminated, a corresponding correlation result is obtained, a target synchronous signal block is determined according to the correlation result, the phase deviation is eliminated, and the accuracy of the obtained synchronous signal block is improved.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a signal processing method and apparatus, a computer device, and a storage medium.
Background
The 5G cell search process includes Primary Synchronization Signal (PSS) search, Secondary Synchronization Signal (SSS) search, and Physical Broadcast Signal (PBCH) detection. While the PBCH and Synchronization signals (PSS and SSS) of 5G together constitute a Synchronization Signal Block (SSB).
For the receiving end, after PSS and SSS synchronization, to select the synchronization Signal block with the strongest energy for subsequent PBCH decoding, a corresponding DeModulation Reference Signal (DMRS) needs to be used. In the prior art, direct correlation is performed between a local demodulation reference signal and a received signal, and a strongest synchronization signal block is determined according to a direct correlation result. The DMRS signals are distributed on a plurality of symbol bits of the synchronous signal block, different symbol bits have phase deviation due to time difference, frequency offset and the like, and when the first demodulation reference signal in the air interface signal is directly related to the local demodulation reference signal, the obtained result has deviation from the actual result due to the phase deviation.
Disclosure of Invention
In order to solve the technical problem, the present application provides a signal processing method, an apparatus, a computer device and a storage medium.
In a first aspect, the present application provides a signal processing method, including:
receiving an air interface signal sent by a base station, wherein the air interface signal comprises a plurality of synchronous signal blocks, and each synchronous signal block corresponds to a first demodulation reference signal;
generating a plurality of different local demodulation reference signals according to a preset communication protocol;
phase removal is carried out on the first demodulation reference signals of the synchronous signal blocks by adopting the local demodulation reference signals to obtain second demodulation reference signals of the synchronous signal blocks;
performing correlation operation on the second demodulation reference signal of each synchronous signal block and each local demodulation reference signal to obtain a correlation result of each synchronous signal block;
and screening out a target synchronous signal block according to the correlation result of each synchronous signal block.
In a second aspect, the present application provides a signal processing apparatus comprising:
the signal receiving module is used for receiving an air interface signal sent by a base station, wherein the air interface signal comprises a plurality of synchronous signal blocks, and each synchronous signal block corresponds to a first demodulation reference signal;
the signal generating module is used for generating a plurality of different local demodulation reference signals according to a preset communication protocol;
the phase removal module is used for removing the phase of the first demodulation reference signal of each synchronous signal block by adopting each local demodulation reference signal to obtain a second demodulation reference signal of each synchronous signal block;
the signal correlation module is used for carrying out correlation operation on the second demodulation reference signal of each synchronous signal block and each local demodulation reference signal to obtain a correlation result of each synchronous signal block;
and the synchronous signal determining module is used for screening out the target synchronous signal block according to the correlation result of each synchronous signal block.
A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
receiving an air interface signal sent by a base station, wherein the air interface signal comprises a plurality of synchronous signal blocks, and each synchronous signal block corresponds to a first demodulation reference signal;
generating a plurality of different local demodulation reference signals according to a preset communication protocol;
phase removal is carried out on the first demodulation reference signals of the synchronous signal blocks by adopting the local demodulation reference signals to obtain second demodulation reference signals of the synchronous signal blocks;
performing correlation operation on the second demodulation reference signal of each synchronous signal block and each local demodulation reference signal to obtain a correlation result of each synchronous signal block;
and screening out the target synchronous signal block according to the correlation result of each synchronous signal block.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
receiving an air interface signal sent by a base station, wherein the air interface signal comprises a plurality of synchronous signal blocks, and each synchronous signal block corresponds to a first demodulation reference signal;
generating a plurality of different local demodulation reference signals according to a preset communication protocol;
phase removal is carried out on the first demodulation reference signals of the synchronous signal blocks by adopting the local demodulation reference signals to obtain second demodulation reference signals of the synchronous signal blocks;
performing correlation operation on the second demodulation reference signal of each synchronous signal block and each local demodulation reference signal to obtain a correlation result of each synchronous signal block;
and screening out the target synchronous signal block according to the correlation result of each synchronous signal block.
The signal processing method, the signal processing device, the computer equipment and the storage medium comprise the following steps: receiving an air interface signal sent by a base station, wherein the air interface signal comprises a plurality of synchronous signal blocks, and each synchronous signal block corresponds to a first demodulation reference signal; generating a plurality of different local demodulation reference signals according to a preset communication protocol; phase removal is carried out on the first demodulation reference signals of the synchronous signal blocks by adopting the local demodulation reference signals to obtain second demodulation reference signals of the synchronous signal blocks; performing correlation operation on the second demodulation reference signal of each synchronous signal block and each local demodulation reference signal to obtain a correlation result of each synchronous signal block; and screening out the target synchronous signal block according to the correlation result of each synchronous signal block. The phase deviation is eliminated from the first demodulation reference signal through the generated local demodulation reference signals, signal correlation is executed after the phase deviation is eliminated, a corresponding correlation result is obtained, a target synchronous signal block is determined according to the correlation result, the phase deviation is eliminated, and the accuracy of the obtained synchronous signal block is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a diagram of an exemplary signal processing method;
FIG. 2 is a flow diagram illustrating a signal processing method according to an embodiment;
FIG. 3 is a diagram of a synchronization signal block in one embodiment;
FIG. 4 is a schematic flow chart of a signal removal step in one embodiment;
FIG. 5 is a flow chart illustrating a signal processing method according to another embodiment;
FIG. 6 is a block diagram showing the structure of a signal processing apparatus according to an embodiment;
FIG. 7 is a block diagram of the structure of a phase removal module in one embodiment;
FIG. 8 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a diagram of an application environment of a signal processing method in one embodiment. Referring to fig. 1, the signal processing method is applied to a signal processing system. The signal processing system comprises a terminal 110 and a base station 120. The terminal 110 and the base station 120 are connected through a network. The terminal 110 may be a mobile terminal, and the mobile terminal may be at least one of a mobile phone, a tablet computer, a notebook computer, and the like.
In one embodiment, as shown in fig. 2, a signal processing method is provided. The embodiment is mainly illustrated by applying the method to the terminal 110 in fig. 1. Referring to fig. 2, the signal processing method specifically includes the following steps:
step S201, an air interface signal sent by the base station is received.
In this embodiment, the air interface signal includes a plurality of synchronization signal blocks, and each synchronization signal block corresponds to one first demodulation reference signal.
Step S202, a plurality of different local demodulation reference signals are generated according to a preset communication protocol.
Specifically, the air interface signal refers to a wireless signal transmitted by the base station. The air interface signal comprises a plurality of synchronous signal blocks. A schematic diagram of a synchronization signal block is shown in fig. 3, and includes OFDM in the 4 time domains and 240 subcarriers in the frequency domain. The PSS is located in the middle 127 subcarriers of symbol 0. SSS is located in the middle 127 subcarriers of symbol 2; in order to protect PSS and SSS, there are different subcarriers at both ends. PBCH is positioned on symbols 1, 3 and symbol 2, wherein symbols 1 and 3 occupy all subcarriers from 0 to 239, and symbol 2 occupies all subcarriers except subcarriers occupied by SSS and subcarriers protecting SSS. The first demodulation reference signal is located in the middle of PBCH, and 60 subcarriers are spaced on each symbol on symbols 1 and 3, that is, the first demodulation reference signal is mapped by inserting 1 DM-RS symbol every 3 PBCH symbols, wherein there is a phase deviation between 3 OFDM symbols of PBCH.
The preset communication protocol is a communication protocol configured in advance, and generates a local demodulation reference signal according to the communication protocol, where the local demodulation reference signal is theoretically the same as a first demodulation reference signal included in an air interface signal. Wherein the local demodulation reference signal and the first demodulation reference signal are both golg sequences. The golg sequence is a pseudo-random sequence with better characteristics, which is proposed and analyzed on the basis of m sequences, namely, two m sequences with equal code length and same code clock rate are preferably formed by modulo-2 addition.
Step S203, performing phase removal on the first demodulation reference signal of each synchronization signal block by using each local demodulation reference signal, to obtain a second demodulation reference signal of each synchronization signal block.
Step S204, perform correlation operation on the second demodulation reference signal of each synchronization signal block and each local demodulation reference signal to obtain a correlation result of each synchronization signal block.
Specifically, each local demodulation reference signal is adopted to perform phase elimination operation on each first demodulation reference signal, so that the error influence caused by phase deviation is reduced, and a second demodulation reference signal with the phase deviation eliminated is obtained. And performing signal mutual operation by adopting each second demodulation reference signal of each synchronous signal block and each local demodulation reference signal to obtain a correlation result of each synchronous signal block, wherein each correlation result is a group of sequences, namely comprises a plurality of sequence elements, each sequence element comprises at least one maximum value, and the maximum value is the peak value of the correlation result.
In step S205, a target sync block is screened out according to the correlation result of each sync block.
Specifically, the sync signal blocks are screened according to the correlation result of each sync signal block, and the strongest sync signal block is screened out as the target sync signal block. The subsequent PBCH is decoded by adopting the strongest synchronization signal block, namely the target synchronization signal block, so that the decoding accuracy is improved.
The signal processing method comprises the following steps: receiving an air interface signal sent by a base station, wherein the air interface signal comprises a plurality of synchronous signal blocks, and each synchronous signal block corresponds to a first demodulation reference signal; generating a plurality of different local demodulation reference signals according to a preset communication protocol; phase removal is carried out on the first demodulation reference signals of the synchronous signal blocks by adopting the local demodulation reference signals to obtain second demodulation reference signals of the synchronous signal blocks; performing correlation operation on the second demodulation reference signal of each synchronous signal block and each local demodulation reference signal to obtain a correlation result of each synchronous signal block; and screening out the target synchronous signal block according to the correlation result of each synchronous signal block. The phase deviation is eliminated from the first demodulation reference signal through the generated local demodulation reference signals, signal correlation is executed after the phase deviation is eliminated, a corresponding correlation result is obtained, a target synchronous signal block is determined according to the correlation result, the phase deviation is eliminated, and the accuracy of the obtained synchronous signal block is improved.
In one embodiment, as shown in fig. 4, step S203 includes:
step S2031, calculating conjugate signals of each local demodulation reference signal to obtain a plurality of local conjugate signals.
Specifically, the local conjugate signal refers to a signal sequence conjugate to the local demodulation reference signal, where X ═ 4+3i, 5-2i, 6-4i ], and then the conjugate signal Y of X ═ 4-3i, 5+2i, 6+4 i. The signals are complex signals, each complex signal comprises a real part and an imaginary part, and the conjugate signals represent two groups of signals with the same real part and opposite imaginary parts. And performing conjugate operation on the local demodulation reference signal to obtain a local conjugate signal.
Step S2032, calculating a product of the elements in each local conjugate signal and the elements of the first demodulation reference signal of each synchronization signal block, to obtain an intermediate signal of the first demodulation reference signal of each synchronization signal block.
Specifically, the product of elements refers to a product of corresponding elements of the two sets of sequences, and a sequence with the same dimension as the two sets of sequences is obtained, and if the local conjugate signal and the first demodulation reference signal are both 1 × n sequences, the intermediate signal is also 1 × n sequences. And carrying out element product on the local conjugate signal and the first demodulation reference signal to position the phase deviation, and obtaining an intermediate signal containing the phase deviation. Since the local demodulation reference signal is theoretically the same as the first demodulation reference signal, when the conjugate signal of the local demodulation reference signal is multiplied by the element correspondence of the first demodulation reference signal, if the two signals are the same, the local conjugate signal and the first demodulation reference signal are conjugate signals each other, so that the imaginary part of the signal can be eliminated, and only the real part remains.
Step S2033, calculating an average value of the intermediate signals of the first demodulation reference signals of each synchronization signal block to obtain an average value signal of the first demodulation reference signals of each synchronization signal block.
Specifically, the average value of the intermediate signal is calculated, that is, the average value of the phase deviation of the intermediate signal is calculated to obtain the averaged phase deviation, and the phase deviation refers to the phase deviation of each first demodulation reference signal, so that the obtained phase deviation is more accurate. The mean value of the phase deviation is calculated by solving the mean value of the signal, so that the calculation accuracy of the phase deviation is improved.
Step S2034, calculating a conjugate signal of the mean value signal of the first demodulation reference signal of each synchronization signal block to obtain the mean value conjugate signal of each synchronization signal block, where the mean value conjugate signal only includes one element.
Step S2035, calculating a product of the first demodulation reference signal of each synchronization signal block and the mean conjugate signal of each corresponding synchronization signal block to obtain a second demodulation reference signal of each synchronization signal block.
Specifically, the phase offset of the mean signal positioning is adopted to reduce the phase offset corresponding to each element of the first demodulation reference signal, that is, the mean conjugate signal is multiplied by each element of each first demodulation reference signal to reduce the phase offset corresponding to each element of the first demodulation reference signal, so as to obtain the second demodulation reference signal with the phase offset reduced.
In one embodiment, step S204 includes: and acquiring peak values in the correlation results of all the synchronous signal blocks, and selecting the synchronous signal block corresponding to the maximum value from the peak values corresponding to all the synchronous signal blocks as a target synchronous signal block.
Specifically, each synchronization signal block corresponds to a plurality of correlation results, each correlation result includes a corresponding maximum value, that is, each correlation result includes at least one peak value, that is, each correlation result may include one or more maximum values in a corresponding sequence. If there are multiple maximum values in the sequence corresponding to the correlation result, the signal corresponding to the sequence corresponding to the correlation result may be a periodic signal. The maximum value is selected because the maximum value represents the highest similarity, and the maximum value is selected by selecting the synchronization signal block corresponding to the maximum value from the peak values corresponding to the synchronization signal blocks and using the synchronization signal block corresponding to the maximum value as the target synchronization signal block. And selecting the synchronization signal block corresponding to the maximum value as a target synchronization signal block, wherein the target synchronization signal block corresponds to the signal block with the strongest energy.
In an embodiment, the air interface signal includes a preset number of synchronization signal blocks, and step S202 includes: and generating a preset number of different local demodulation reference signals according to a preset communication protocol.
In this embodiment, step S203 includes: and performing correlation operation on the second demodulation reference signal of each synchronous signal block and each local demodulation reference signal to obtain a preset number of correlation results of each synchronous signal block.
In this embodiment, obtaining the peak value in the correlation result of each synchronization signal block includes: and acquiring the peak values of the preset number of correlation results of each synchronous signal block to obtain the preset number of peak values of each synchronous signal block, and selecting the maximum value from the preset number of peak values of each synchronous signal block to obtain the maximum peak value of each synchronous signal block.
In this embodiment, selecting the synchronization signal block corresponding to the maximum value from the peak values corresponding to the synchronization signal blocks as the target synchronization signal block includes: and selecting the synchronization signal block corresponding to the maximum value as the target synchronization signal block from the maximum peak value of each synchronization signal block.
Specifically, the preset number is predetermined according to a communication protocol or the like. When the local demodulation reference signals are generated according to the communication protocol, destination demodulation reference signals with the same number as that of the synchronization signal blocks contained in the air interface signals, namely, the local demodulation reference signals with the preset number, are generated. And performing phase removal on the preset number of first demodulation reference signals by adopting the preset number of local demodulation reference signals to obtain the preset number of second demodulation reference signals. And performing correlation operation on a preset number of second demodulation reference signals and a preset number of local demodulation reference signals to obtain a preset number of correlation results of each second demodulation reference signal, namely the preset number of correlation results corresponding to the preset number of synchronous signal blocks. And acquiring corresponding peak values from the preset number of correlation results corresponding to each synchronous signal block, and selecting the maximum peak value from the corresponding peak values to obtain the maximum peak value of each synchronous signal block. And selecting a maximum value from the maximum peak values of each synchronous signal block, and taking the synchronous signal block corresponding to the maximum value as a target synchronous signal block.
The phase error when the possible DMRS signals are respectively correlated with the received signals is eliminated, so that the obtained SSB index is more accurate.
In an embodiment, the air interface signal includes a preset number of the synchronization signal blocks, and the sequence index of the first demodulation reference signal corresponding to each synchronization signal block corresponds to a field sequence index of a corresponding synchronization signal in a one-to-one manner, as shown in fig. 5, after step S205, the method further includes:
in step S206, when the preset number is 4, 2 less significant bits are determined from the field sequence index of the target sync signal block.
In step S207, when the preset number is greater than 4 and less than 64, 3 less significant bits are determined from the field sequence index of the target sync signal block.
In step S208, when the preset number is 64, 3 high significant bits are determined from the field sequence index of the target synchronization signal block.
Specifically, when the synchronization signal block contains 4 in number, 2 less significant bits are determined from the field sequence index of the target synchronization signal block. When binary representation is adopted, 2 significant bits can represent numbers within 4, so that 2 low significant bits are determined. When the number is more than 4, more significant bits are required to represent, so that 3 low significant bits are determined, and similarly, when the preset number is 64, more significant bits are required, the high significant bits are used for determination. There is no sequence among step S206, step S207, and step S208, and it is an effective index manner under different situations. And determining the corresponding effective bits according to the preset number, so that the indexing result can be accurately determined.
Fig. 2, 4 and 5 are schematic flow diagrams of a signal processing method in one embodiment. It should be understood that although the various steps in the flowcharts of fig. 2, 4 and 5 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2, 4 and 5 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternatingly with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 6, there is provided a signal processing apparatus 200 comprising:
the signal receiving module 201 is configured to receive an air interface signal sent by a base station, where the air interface signal includes multiple synchronization signal blocks, and each synchronization signal block corresponds to a first demodulation reference signal.
The signal generating module 202 is configured to generate a plurality of different local demodulation reference signals according to a preset communication protocol.
The phase removing module 203 is configured to perform phase removal on the first demodulation reference signal of each synchronization signal block by using each local demodulation reference signal, so as to obtain a second demodulation reference signal of each synchronization signal block.
The signal correlation module 204 is configured to perform correlation operation on the second demodulation reference signal of each synchronization signal block and each local demodulation reference signal to obtain a correlation result of each synchronization signal block.
A synchronization signal determining module 205, configured to filter out a target synchronization signal block according to the correlation result of each synchronization signal block.
In one embodiment, as shown in fig. 7, the phase removal module 203 includes:
the local conjugate signal calculation unit 2031 is configured to calculate a conjugate signal of each local demodulation reference signal, and obtain a plurality of local conjugate signals.
An element product unit 2032, configured to calculate a product between an element in each local conjugate signal and an element of the first demodulation reference signal of each synchronization signal block, to obtain an intermediate signal of the first demodulation reference signal of each synchronization signal block.
The average value calculating unit 2033 is configured to calculate an average value of the intermediate signals of the first demodulation reference signals of each synchronization signal block, and obtain an average value signal of the first demodulation reference signals of each synchronization signal block.
The mean conjugate signal calculating unit 2034 is configured to calculate a conjugate signal of the mean signal of the first demodulation reference signal of each synchronization signal block, and obtain a mean conjugate signal of each synchronization signal block.
The signal product calculating unit 2035 is configured to calculate a product between the first demodulation reference signal of each synchronization signal block and the mean conjugate signal of each corresponding synchronization signal block, so as to obtain a second demodulation reference signal of each synchronization signal block.
In an embodiment, the synchronization signal determining module 205 is specifically configured to obtain a peak value in the correlation result of each synchronization signal block, and select a synchronization signal block corresponding to a maximum value from the peak values corresponding to each synchronization signal block as a target synchronization signal block.
In one embodiment, the signal processing apparatus 200 includes:
the signal generating module 202 is specifically configured to generate a preset number of different local demodulation reference signals according to a preset communication protocol, where an air interface signal includes a preset number of synchronization signal blocks.
The signal correlation module 204 is specifically configured to perform correlation operation on the second demodulation reference signal of each synchronization signal block and each local demodulation reference signal to obtain a preset number of correlation results of each synchronization signal block;
the synchronization signal determining module 205 is specifically configured to obtain peak values of a preset number of correlation results of each synchronization signal block, obtain a preset number of peak values of each synchronization signal block, and select a maximum value from the preset number of peak values of each synchronization signal block, so as to obtain a maximum peak value of each synchronization signal block; and selecting the synchronization signal block corresponding to the maximum value as the target synchronization signal block from the maximum peak value of each synchronization signal block.
In one embodiment, the signal processing apparatus 200 further includes:
an index determining module, configured to determine 2 low significant bits from the field sequence indexes of the target synchronization signal blocks when the preset number is 4, where the air interface signal includes a preset number of synchronization signal blocks, and the sequence index of the first demodulation reference signal corresponding to each synchronization signal block corresponds to the field sequence index of the corresponding synchronization signal one to one.
The index determining module is further configured to determine 3 less significant bits from the field sequence index of the target synchronization signal block when the preset number is greater than 4 and less than 64.
The index determining module is further configured to determine 3 high significant bits from the field sequence index of the target synchronization signal block when the preset number is 64.
FIG. 8 is a diagram illustrating an internal structure of a computer device in one embodiment. The computer device may specifically be the terminal 110 in fig. 1. As shown in fig. 8, the computer apparatus includes a processor, a memory, a network interface, an input device, and a display screen connected via a system bus. Wherein the memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the computer device stores an operating system and may also store a computer program which, when executed by the processor, causes the processor to implement the signal processing method. The internal memory may also have stored therein a computer program that, when executed by the processor, causes the processor to perform a signal processing method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 8 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, the signal processing apparatus provided in the present application may be implemented in the form of a computer program, and the computer program may be run on a computer device as shown in fig. 8. The memory of the computer device may store various program modules constituting the signal processing apparatus, such as a signal receiving module 201, a signal generating module 202, a phase removing module 203, a signal correlating module 204, and a synchronization signal determining module 205 shown in fig. 6. The computer program constituted by the respective program modules causes the processor to execute the steps in the signal processing method of the respective embodiments of the present application described in the present specification.
For example, the computer device shown in fig. 8 may perform receiving, by using the signal receiving module 201 in the signal processing apparatus shown in fig. 6, an air interface signal sent by a base station, where the air interface signal includes a plurality of synchronization signal blocks, and each synchronization signal block corresponds to one first demodulation reference signal. The computer device may perform the generation of the plurality of different local demodulation reference signals according to the preset communication protocol through the signal generation module 202. The computer device may perform phase removal on the first demodulation reference signal of each synchronization signal block by using each local demodulation reference signal through the phase removal module 203 to obtain a second demodulation reference signal of each synchronization signal block. The computer device may perform a correlation operation on the second demodulation reference signal of each synchronization signal block and each local demodulation reference signal through the signal correlation module 204 to obtain a correlation result of each synchronization signal block. The computer device may perform a filtering out of the target sync signal block according to the correlation result of each sync signal block by the sync signal determination module 205.
In one embodiment, a computer device is provided, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program: receiving an air interface signal sent by a base station, wherein the air interface signal comprises a plurality of synchronous signal blocks, and each synchronous signal block corresponds to a first demodulation reference signal; generating a plurality of different local demodulation reference signals according to a preset communication protocol; phase removal is carried out on the first demodulation reference signals of the synchronous signal blocks by adopting the local demodulation reference signals to obtain second demodulation reference signals of the synchronous signal blocks; performing correlation operation on the second demodulation reference signal of each synchronous signal block and each local demodulation reference signal to obtain a correlation result of each synchronous signal block; and screening out the target synchronous signal block according to the correlation result of each synchronous signal block.
In one embodiment, the phase-removing the first demodulation reference signal of each synchronization signal block by using each local demodulation reference signal to obtain the second demodulation reference signal of each synchronization signal block includes: calculating conjugate signals of each local demodulation reference signal to obtain a plurality of local conjugate signals; calculating the product of the element in each local conjugate signal and the element of the first demodulation reference signal of each synchronization signal block to obtain the intermediate signal of the first demodulation reference signal of each synchronization signal block; calculating the mean value of the intermediate signals of the first demodulation reference signals of each synchronous signal block to obtain the mean value signal of the first demodulation reference signals of each synchronous signal block; calculating a conjugate signal of the mean value signal of the first demodulation reference signal of each synchronous signal block to obtain the mean value conjugate signal of each synchronous signal block; and calculating the product of the first demodulation reference signal of each synchronous signal block and the mean conjugate signal of each corresponding synchronous signal block to obtain the second demodulation reference signal of each synchronous signal block.
In one embodiment, the screening out the target synchronization signal block according to the correlation result of each synchronization signal block comprises: acquiring a peak value in a correlation result of each synchronous signal block; and selecting the synchronization signal block corresponding to the maximum value from the peak values corresponding to the synchronization signal blocks as a target synchronization signal block.
In one embodiment, the air interface signal includes a preset number of synchronization signal blocks, and generates a plurality of different local demodulation reference signals according to a preset communication protocol, including: generating a preset number of different local demodulation reference signals according to a preset communication protocol; performing correlation operation on the second demodulation reference signal of each synchronization signal block and each local demodulation reference signal to obtain a correlation result of each synchronization signal block, including: performing correlation operation on the second demodulation reference signal of each synchronous signal block and each local demodulation reference signal to obtain a preset number of correlation results of each synchronous signal block; obtaining a peak in the correlation result for each synchronization signal block, comprising: acquiring the peak values of the correlation results of the preset number of each synchronous signal block to obtain the peak values of the preset number of each synchronous signal block, and selecting the maximum value from the peak values of the preset number of each synchronous signal block to obtain the maximum peak value of each synchronous signal block; selecting the synchronization signal block corresponding to the maximum value from the peak values corresponding to the synchronization signal blocks as a target synchronization signal block, wherein the method comprises the following steps: and selecting the synchronization signal block corresponding to the maximum value as the target synchronization signal block from the maximum peak value of each synchronization signal block.
In one embodiment, the air interface signal includes a preset number of synchronization signal blocks, the sequence index of the first demodulation reference signal corresponding to each synchronization signal block corresponds to the field sequence index of the corresponding synchronization signal one to one, and after the target synchronization signal block is screened out according to the correlation result of each synchronization signal block, the processor further implements the following steps when executing the computer program: when the preset number is 4, determining 2 low significant bits from the field sequence index of the target synchronous signal block; determining 3 less significant bits from the field sequence index of the target sync signal block when the preset number is greater than 4 and less than 64; when the preset number is 64, 3 high significant bits are determined from the field sequence index of the target sync signal block.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of: receiving an air interface signal sent by a base station, wherein the air interface signal comprises a plurality of synchronous signal blocks, and each synchronous signal block corresponds to a first demodulation reference signal; generating a plurality of different local demodulation reference signals according to a preset communication protocol; phase removal is carried out on the first demodulation reference signals of the synchronous signal blocks by adopting the local demodulation reference signals to obtain second demodulation reference signals of the synchronous signal blocks; performing correlation operation on the second demodulation reference signal of each synchronous signal block and each local demodulation reference signal to obtain a correlation result of each synchronous signal block; and screening out the target synchronous signal block according to the correlation result of each synchronous signal block.
In one embodiment, the phase-removing the first demodulation reference signal of each synchronization signal block by using each local demodulation reference signal to obtain the second demodulation reference signal of each synchronization signal block includes: calculating conjugate signals of each local demodulation reference signal to obtain a plurality of local conjugate signals; calculating the product of the element in each local conjugate signal and the element of the first demodulation reference signal of each synchronization signal block to obtain the intermediate signal of the first demodulation reference signal of each synchronization signal block; calculating the mean value of the intermediate signals of the first demodulation reference signals of each synchronous signal block to obtain the mean value signal of the first demodulation reference signals of each synchronous signal block; calculating a conjugate signal of the mean value signal of the first demodulation reference signal of each synchronous signal block to obtain the mean value conjugate signal of each synchronous signal block; and calculating the product of the first demodulation reference signal of each synchronous signal block and the mean conjugate signal of each corresponding synchronous signal block to obtain the second demodulation reference signal of each synchronous signal block.
In one embodiment, the screening out the target synchronization signal block according to the correlation result of each synchronization signal block comprises: acquiring a peak value in a correlation result of each synchronous signal block; and selecting the synchronization signal block corresponding to the maximum value from the peak values corresponding to the synchronization signal blocks as a target synchronization signal block.
In one embodiment, the air interface signal includes a preset number of synchronization signal blocks, and generates a plurality of different local demodulation reference signals according to a preset communication protocol, including: generating a preset number of different local demodulation reference signals according to a preset communication protocol; performing correlation operation on the second demodulation reference signal of each synchronization signal block and each local demodulation reference signal to obtain a correlation result of each synchronization signal block, including: performing correlation operation on the second demodulation reference signal of each synchronous signal block and each local demodulation reference signal to obtain a preset number of correlation results of each synchronous signal block; obtaining a peak in the correlation result for each synchronization signal block, comprising: acquiring the peak values of the correlation results of the preset number of each synchronous signal block to obtain the peak values of the preset number of each synchronous signal block, and selecting the maximum value from the peak values of the preset number of each synchronous signal block to obtain the maximum peak value of each synchronous signal block; selecting the synchronization signal block corresponding to the maximum value from the peak values corresponding to the synchronization signal blocks as a target synchronization signal block, wherein the method comprises the following steps: and selecting the synchronization signal block corresponding to the maximum value as the target synchronization signal block from the maximum peak value of each synchronization signal block.
In one embodiment, the air interface signal includes a preset number of synchronization signal blocks, the sequence index of the first demodulation reference signal corresponding to each synchronization signal block corresponds to the field sequence index of the corresponding synchronization signal one to one, and after the target synchronization signal block is screened out according to the correlation result of each synchronization signal block, the computer program further implements the following steps when executed by the processor: when the preset number is 4, determining 2 low significant bits from the field sequence index of the target synchronous signal block; determining 3 less significant bits from the field sequence index of the target sync signal block when the preset number is greater than 4 and less than 64; when the preset number is 64, 3 high significant bits are determined from the field sequence index of the target sync signal block.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by a computer program, which may be stored in a non-volatile computer readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
It is noted that, in this document, relational terms such as "first" and "second," and the like, are 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. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method of signal processing, the method comprising:
receiving an air interface signal sent by a base station, wherein the air interface signal comprises a plurality of synchronous signal blocks, and each synchronous signal block corresponds to a first demodulation reference signal;
generating a plurality of different local demodulation reference signals according to a preset communication protocol;
performing phase removal on the first demodulation reference signal of each synchronous signal block by using each local demodulation reference signal to obtain a second demodulation reference signal of each synchronous signal block;
performing correlation operation on the second demodulation reference signal of each synchronization signal block and each local demodulation reference signal to obtain a correlation result of each synchronization signal block;
and screening out a target synchronous signal block according to the correlation result of each synchronous signal block.
2. The method of claim 1, wherein the phase-removing the first demodulation reference signal of each of the synchronization signal blocks by using each of the local demodulation reference signals to obtain the second demodulation reference signal of each of the synchronization signal blocks comprises:
calculating conjugate signals of the local demodulation reference signals to obtain a plurality of local conjugate signals;
calculating the product of the element in each local conjugate signal and the element of the first demodulation reference signal of each synchronization signal block to obtain an intermediate signal of the first demodulation reference signal of each synchronization signal block;
calculating the mean value of the intermediate signals of the first demodulation reference signals of each synchronous signal block to obtain the mean value signal of the first demodulation reference signals of each synchronous signal block;
calculating a conjugate signal of the mean value signal of the first demodulation reference signal of each synchronous signal block to obtain the mean value conjugate signal of each synchronous signal block;
and calculating the product of the first demodulation reference signal of each synchronous signal block and the mean conjugate signal of each corresponding synchronous signal block to obtain a second demodulation reference signal of each synchronous signal block.
3. The method of claim 1, wherein the filtering out the target synchronization signal block according to the correlation result of each synchronization signal block comprises:
acquiring a peak value in a correlation result of each synchronization signal block;
and selecting the synchronization signal block corresponding to the maximum value from the peak values corresponding to the synchronization signal blocks as the target synchronization signal block.
4. The method according to claim 3, wherein the air interface signal includes a preset number of the synchronization signal blocks, and the method includes:
the generating a plurality of different local demodulation reference signals according to a preset communication protocol includes: generating the preset number of different local demodulation reference signals according to the preset communication protocol;
the performing a correlation operation on the second demodulation reference signal of each of the synchronization signal blocks and each of the local demodulation reference signals to obtain a correlation result of each of the synchronization signal blocks includes: performing correlation operation on the second demodulation reference signal of each synchronization signal block and each local demodulation reference signal to obtain a preset number of correlation results of each synchronization signal block;
the obtaining a selected peak from the correlation results of each of the synchronization signal blocks includes: acquiring peak values of a preset number of correlation results of each synchronous signal block to obtain a preset number of peak values of each synchronous signal block, and selecting a maximum value from the preset number of peak values of each synchronous signal block to obtain a maximum peak value of each synchronous signal block;
the selecting a synchronization signal block corresponding to a maximum value from the peak values corresponding to the synchronization signal blocks as the target synchronization signal block includes: and selecting the synchronization signal block corresponding to the maximum peak value of each synchronization signal block as the target synchronization signal block.
5. The method according to any one of claims 1 to 4, wherein the air interface signal includes a preset number of the synchronization signal blocks, sequence indexes of first demodulation reference signals corresponding to each of the synchronization signal blocks are in one-to-one correspondence with half-frame sequence indexes of the corresponding synchronization signals, and after a target synchronization signal block is screened according to a correlation result of each of the synchronization signal blocks, the method further includes:
when the preset number is 4, determining 2 low significant bits from the field sequence index of the target synchronization signal block;
determining 3 less significant bits from a field sequence index of the target synchronization signal block when the preset number is greater than 4 and less than 64;
when the preset number is 64, determining 3 high significant bits from a field sequence index of the target synchronization signal block.
6. A signal processing apparatus, characterized in that the apparatus comprises:
a signal receiving module, configured to receive an air interface signal sent by a base station, where the air interface signal includes multiple synchronization signal blocks, and each synchronization signal block corresponds to a first demodulation reference signal;
the signal generation module is used for generating a plurality of different local demodulation reference signals according to a preset communication protocol;
the phase removal module is used for removing the phase of the first demodulation reference signal of each synchronous signal block by adopting each local demodulation reference signal to obtain a second demodulation reference signal of each synchronous signal block;
a signal correlation module, configured to perform correlation operation on the second demodulation reference signal of each synchronization signal block and each local demodulation reference signal to obtain a correlation result of each synchronization signal block;
and the synchronous signal determining module is used for screening out a target synchronous signal block according to the correlation result of each synchronous signal block.
7. The apparatus of claim 6, wherein the phase removal module comprises:
a local conjugate signal calculation unit, configured to calculate a conjugate signal of each local demodulation reference signal to obtain a plurality of local conjugate signals;
an element product unit, configured to calculate a product between an element in each local conjugate signal and an element of the first demodulation reference signal of each synchronization signal block, to obtain an intermediate signal of the first demodulation reference signal of each synchronization signal block;
the mean value calculating unit is used for calculating the mean value of the intermediate signals of the first demodulation reference signals of each synchronous signal block to obtain the mean value signals of the first demodulation reference signals of each synchronous signal block;
the mean conjugate signal calculation unit is used for calculating a conjugate signal of a mean signal of the first demodulation reference signal of each synchronous signal block to obtain a mean conjugate signal of each synchronous signal block;
and the signal product calculating unit is used for calculating the product of the first demodulation reference signal of each synchronous signal block and the mean conjugate signal of each corresponding synchronous signal block to obtain the second demodulation reference signal of each synchronous signal block.
8. The apparatus according to claim 6, wherein the synchronization signal determining module is specifically configured to obtain a peak value in the correlation result of each synchronization signal block, and select a synchronization signal block corresponding to a maximum value from the peak values corresponding to each synchronization signal block as the target synchronization signal block.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method of any of claims 1 to 5 are implemented when the computer program is executed by the processor.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 5.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1564492A (en) * | 2004-04-02 | 2005-01-12 | 清华大学 | Frame synchronous circuit and method for eliminating time frequency deviation effect of orthogonal FDM |
| CN103475621A (en) * | 2013-09-27 | 2013-12-25 | 上海贝岭股份有限公司 | Multi-carrier synchronizing system and synchronizing method |
| CN109729034A (en) * | 2017-10-27 | 2019-05-07 | 电信科学技术研究院 | A kind of timing method, device and terminal |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1564492A (en) * | 2004-04-02 | 2005-01-12 | 清华大学 | Frame synchronous circuit and method for eliminating time frequency deviation effect of orthogonal FDM |
| CN103475621A (en) * | 2013-09-27 | 2013-12-25 | 上海贝岭股份有限公司 | Multi-carrier synchronizing system and synchronizing method |
| CN109729034A (en) * | 2017-10-27 | 2019-05-07 | 电信科学技术研究院 | A kind of timing method, device and terminal |
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