CN117527502B

CN117527502B - Signal synchronization method and storage medium

Info

Publication number: CN117527502B
Application number: CN202410008175.0A
Authority: CN
Inventors: 罗森; 王国强; 万能
Original assignee: Shenzhen Siglent Technologies Co Ltd
Current assignee: Shenzhen Siglent Technologies Co Ltd
Priority date: 2024-01-04
Filing date: 2024-01-04
Publication date: 2024-03-26
Anticipated expiration: 2044-01-04
Also published as: CN117527502A

Abstract

A signal synchronization method, comprising: acquiring NR waveform data; performing sliding correlation calculation within a preset length of NR waveform data: respectively taking the current preset position as a starting point to acquire at least one preset symbol; acquiring cyclic prefixes and tail data corresponding to the cyclic prefixes which meet the preset symbols, and performing cross-correlation calculation between the cyclic prefixes and the tail data to obtain the correlation degree of the current preset position; and acquiring a target preset position with highest correlation degree in a preset length and meeting a preset threshold value, and performing correlation search based on the target preset position through a pilot signal corresponding to the NR waveform data to obtain the position of a frame head in the NR waveform data so as to complete synchronization of the NR waveform data. Since the correlation search is performed based on the boundary position of the NR waveform symbol by the pilot signal, the correlation search for each data point becomes the correlation search for the NR waveform symbol, thereby reducing the calculation amount. The application also provides a storage medium.

Description

Signal synchronization method and storage medium

Technical Field

The present disclosure relates to the field of signal synchronization technologies, and in particular, to a signal synchronization method and a storage medium.

Background

5G is the latest standard for modern commercial mobile communications, and is very widely used. Wherein, SSB (Synchronization Signal/PBCH, synchronization broadcast block) for cell synchronization is fixed in the 5G protocol, which is the most convenient synchronization mode. However, for signals without SSB, such as uplink signals, or TM test mode specified by the base station consistency test protocol, other synchronization methods can only be used.

Currently, in 5G communication, pilot signals are generally used for correlation synchronization without SSB. Because the pilot signal is necessarily present and the configuration parameters, if determined, the local pilot signal can be calculated locally as a reference. And the pilot signal is used for sliding correlation on the received signal, the maximum correlation degree appears at the pilot position of the received signal, so that the synchronization is realized. However, when the pilot signal is used for correlation calculation, correlation calculation needs to be performed once for each data point in one frame of data, which results in large calculation amount and low speed. Therefore, new technical solutions are also needed.

Disclosure of Invention

The technical problem that this application mainly solves is that the calculated amount of synchronization is great, and the speed of synchronization is slower.

According to a first aspect, in one embodiment, there is provided a signal synchronization method applied to an NR wireless network, the signal synchronization method including:

acquiring NR waveform data, wherein the length of the NR waveform data is at least the length of one frame of data;

performing sliding correlation calculation within a preset length of the NR waveform data: after each sliding of the preset position within the preset length, at least one preset symbol is obtained by taking the current preset position as a starting point, wherein the length of the preset symbol is the length of one NR waveform symbol in the NR waveform data; the cyclic prefix of each preset symbol meeting preset conditions and tail data corresponding to the cyclic prefix are obtained, and cross-correlation calculation is carried out between each cyclic prefix and each tail data to obtain the correlation degree of the current preset position;

and acquiring a target preset position with highest correlation degree in the preset length and meeting a preset threshold value, and carrying out correlation search on the basis of the target preset position through a pilot signal corresponding to the NR waveform data to obtain the position of a frame head in the NR waveform data so as to complete synchronization of the NR waveform data.

In some embodiments, the preset length ranges from a length of one NR waveform symbol in the NR waveform data to a length of one frame of data.

In some embodiments, when the highest correlation within the preset length does not meet the preset threshold, the preset length is extended and the sliding correlation calculation is continued until the preset length is extended to the length of one frame of data.

In some embodiments, the NR waveform symbol in the NR waveform data includes a first cyclic prefix or a second cyclic prefix, and when the first cyclic prefix is greater than a length of the second cyclic prefix, the length of the preset symbol is a length of the NR waveform symbol including the second cyclic prefix, and a length of a cyclic prefix of the preset symbol is obtained to be the same as the second cyclic prefix.

In some embodiments, the length of the at least one preset symbol is the length of one half subframe minus one half subframe header in the NR waveform data.

In some embodiments, the performing, by the pilot signal corresponding to the NR waveform data, a correlation search based on the target preset position to obtain a position of a frame header in the NR waveform data includes:

obtaining the boundary position of one half subframe in the NR waveform data based on the target preset position, carrying out correlation search on the boundary position of the half subframe through each pilot frequency half subframe of the pilot frequency signal in at least one frame of data, obtaining the position of the pilot frequency half subframe with the largest correlation degree in one frame of data, and taking the position of the boundary position of the half subframe in one frame of data;

and obtaining the position of the frame head in the NR waveform data from the boundary position of the half subframe based on the position of the boundary position of the half subframe in one frame of data.

obtaining the boundary position of one NR waveform symbol in the NR waveform data based on the target preset position, carrying out correlation search on the boundary position of the NR waveform symbol through each pilot half subframe of the pilot signal in at least one frame of data, obtaining the position of the pilot half subframe with the maximum correlation in one frame of data, and taking the position of the boundary position of the NR waveform symbol as the half subframe position of the pilot half subframe in one frame of data;

performing correlation search on the boundary position of the NR waveform symbol through each pilot symbol of the pilot signal in the pilot half subframe with the maximum correlation degree, obtaining the position of the pilot symbol with the maximum correlation degree in the pilot half subframe, and taking the position of the boundary position of the NR waveform symbol in the half subframe position;

and obtaining the position of the frame head in the NR waveform data from the boundary position of the NR waveform symbol based on the half-subframe position and the position of the boundary position of the NR waveform symbol in the half-subframe position.

In some embodiments, a second number of pilot symbols in the pilot signal is determined based on a first number of resource blocks of NR waveform symbols in the NR waveform data, the first number being inversely related to the second number, and a correlation search is performed on boundary positions of the NR waveform symbols by the second number of pilot symbols.

In some embodiments, the performing, by using each pilot symbol of the pilot signal in the pilot half subframe with the greatest correlation, a correlation search on a boundary position of the NR waveform symbol includes:

performing correlation calculation on boundary positions of the NR waveform symbols and boundary positions of a plurality of NR waveform symbols which meet preset conditions after the boundary positions, wherein the boundary positions correspond to continuous second number of pilot symbols in each pilot symbol one by one, and multiplying results of each correlation calculation to obtain final correlation degree of the current second number of pilot symbols;

and after each continuous second number of pilot symbols in each pilot symbol are respectively subjected to correlation calculation, determining the position of the boundary position of the NR waveform symbol in the NR waveform data based on the position of the second number of pilot symbols corresponding to the highest final correlation degree so as to complete correlation search.

According to a second aspect, an embodiment provides a computer readable storage medium having stored thereon a program executable by a processor to implement the method according to the first aspect.

According to the signal synchronization method of the above embodiment, the correlation calculation is performed based on the cyclic prefix of the preset symbol and the tail data corresponding to the cyclic prefix, and the sliding correlation calculation is performed within the preset length of the NR waveform data, so as to obtain the correlation degree of each position within the preset length. And the target preset position with the highest correlation degree in the preset length and meeting the preset threshold value is the boundary position of the NR waveform symbol in the NR waveform data. Because the pilot signal is used for carrying out the correlation search based on the boundary position of the NR waveform symbol, each data point in the NR waveform data is changed from the correlation search to the correlation search of the NR waveform symbol in the NR waveform data, thereby reducing the calculated amount and rapidly obtaining the position of the frame head in the NR waveform data so as to complete the synchronization of the NR waveform data.

Drawings

FIG. 1 is a flow chart of a signal synchronization method according to an embodiment;

FIG. 2 is a schematic diagram of a half subframe structure according to an embodiment;

FIG. 3 is a schematic diagram of sliding correlation computation of one embodiment;

FIG. 4 is a diagram illustrating a correlation search performed on pilot symbols according to one embodiment;

fig. 5 is a schematic diagram illustrating correlation calculation performed by pilot symbols according to an embodiment;

fig. 6 is a schematic diagram illustrating correlation calculation performed by pilot symbols according to another embodiment.

Detailed Description

The present application is described in further detail below with reference to the accompanying drawings by way of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, some operations associated with the present application have not been shown or described in the specification to avoid obscuring the core portions of the present application, and may not be necessary for a person skilled in the art to describe in detail the relevant operations, as will be apparent from the description herein and the general knowledge of one skilled in the art.

Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.

The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated.

In some embodiments of the present application, since the structure of each NR waveform symbol in the NR waveform data includes a cyclic prefix, the cyclic prefix is the same as the corresponding tail data in the NR waveform symbol. Therefore, after the NR waveform data is obtained, based on the structure of the NR waveform symbol, a preset symbol having the same length as the NR waveform symbol is obtained, correlation calculation is performed based on a cyclic prefix of the preset symbol and tail data corresponding to the cyclic prefix, and sliding correlation calculation is performed within the preset length of the NR waveform data, so as to obtain the correlation degree of each position within the preset length. The target preset position with the highest correlation degree in the preset length and meeting the preset threshold value is the boundary position of the NR waveform symbol in the NR waveform data, and the boundary of each NR waveform symbol in the NR waveform data can be obtained based on the boundary position of the NR waveform symbol because the length of each NR waveform symbol is fixed. When the pilot signal corresponding to the NR waveform data is subjected to correlation search based on the target preset position, the correlation search can be performed on each data point in the NR waveform data, and the correlation search is performed on the NR waveform symbol in the NR waveform data, so that the calculated amount is reduced, and the position of the frame head in the NR waveform data is rapidly obtained, so that the synchronization of the NR waveform data is completed.

Some embodiments provide a signal synchronization method applied to an NR wireless network for synchronizing a received NR signal without SSB. Referring to fig. 1, the following describes the steps of the signal synchronization method in detail.

Step 100: NR waveform data is acquired.

In some embodiments, the synchronization of the NR waveform data mainly enables the receiving end to identify boundaries between frames of data in the NR waveform data, so as to recover the transmitted information from the frames of data. Thus, the length of the NR waveform data is at least the length of one frame of data, for example, data of one frame length is randomly truncated from the received NR waveform data. The basic composition of NR waveform data is a frame structure, and the frame structure will be specifically described below.

When the 5G NR wireless network transmits data, the data is transmitted in units of frames, one frame represents 10ms, and the frame is divided into 10 subframes, and the length of each subframe is the same and is 1ms. And the number of slots contained in each subframe is related to the subcarrier spacing, the NR supports a subcarrier spacing of 15kHz-960kHz, and each subframe contains 1-64 slots. Each slot contains 14 OFDM symbols (NR waveform symbols). Each OFDM symbol is of fixed length and is composed of CP (cyclic prefix) +ifft data, which is the part carrying information, and CP is a copy of the IFFT data tail. Wherein, the CPs include both a long CP (CP 0) and a short CP (CP 1).

Referring to fig. 2, each subframe is equally divided into two parts of 0.5ms, namely a first half subframe and a second half subframe which are identical in length, the head of the first OFDM symbol (half subframe header) of each half subframe is a long CP, and the heads of the other OFDM symbols are short CPs. The cyclic prefix of the OFDM symbol includes a normal cyclic prefix and an extended cyclic prefix, and CP0> CP1 when the cyclic prefix is the normal cyclic prefix, and CP 0=cp 1 when the cyclic prefix is the extended cyclic prefix.

As can be seen from the above frame structure, since the data length of each half-subframe is the same, the boundaries of all half-subframes in one frame of data can be calculated by a fixed number of data points as long as the boundary of one half-subframe is searched. Since the data length of each OFDM symbol is also fixed, the boundaries of all OFDM symbols in a frame of data can be calculated by a fixed number of data points as long as the boundaries of one OFDM symbol are searched.

Step 200: and performing sliding correlation calculation.

In some embodiments, since correlation searching is required for a half-subframe boundary or an OFDM symbol boundary in NR waveform data, the data for performing the correlation searching needs to satisfy a certain length, for example, when correlation searching is performed for the half-subframe boundary in NR waveform data, the preset length of the NR waveform data is at least the length of a half-subframe, for example, when correlation searching is performed for the OFDM symbol boundary in NR waveform data, the preset length of the NR waveform data is at least the length of an OFDM symbol. In some embodiments, the predetermined length ranges from a length of one OFDM symbol in the NR waveform data to a length of one frame of data. After the preset length is determined, a start point of the correlation search needs to be determined, for example, a preset position in the NR waveform data may be used as a start point, and the preset position may be the start point of the NR waveform data.

Referring to fig. 3, in some embodiments, sliding correlation calculation is performed within a predetermined length of NR waveform data using a predetermined position of the NR waveform data as a starting point. In some embodiments, after each sliding of the preset position and each sliding of the preset position within the preset length, at least one preset symbol is obtained by taking the current preset position as a starting point, the length of the preset symbol is the length of one OFDM symbol in the NR waveform data, cyclic prefixes of the preset symbols and tail data corresponding to the cyclic prefixes are obtained, and cross-correlation calculation is performed between each cyclic prefix and each tail data to obtain the correlation of the current preset position.

In this embodiment, under the condition that the boundary of the OFDM symbol in the NR waveform data is not known, the preset position is assumed to be the boundary of the OFDM symbol, then the preset symbol having the same length as the OFDM symbol is acquired based on the preset position, and the preset symbol is assumed to be the OFDM symbol. When the obtained preset symbol is coincident with the OFDM symbol in the NR waveform data, namely the preset symbol has the structural characteristic of the OFDM symbol, otherwise, the preset symbol does not exist. Therefore, when the preset symbol acquired at the current preset position is overlapped with the OFDM symbol, the cyclic prefix of the preset symbol and the tail data corresponding to the cyclic prefix are the same, and at this time, the correlation degree of the current preset position is higher, otherwise, the correlation degree of the current preset position is lower. And after the sliding correlation calculation is completed within the preset length, the correlation degree of each position within the preset length can be obtained.

In some embodiments, the obtained preset symbol needs to satisfy a preset condition, that is, whether there is transmission data in the preset symbol is judged, if there is transmission data, the preset condition is satisfied, otherwise, the preset condition is not satisfied. For example, whether the power of the preset symbol is larger than the power threshold value is judged, if so, data is transmitted, otherwise, no data is transmitted. In some embodiments, the number of preset symbols acquired is at least one, and the more preset symbols, the more accurate the correlation calculation between the cyclic prefix and the tail data. Referring to fig. 3 again, in some embodiments, when there are a plurality of acquired preset symbols, cyclic prefixes of the preset symbols are combined into data 1, tail data corresponding to the cyclic prefixes are combined into data 2, and then correlation between the data 1 and the data 2 is calculated.

As can be seen from the above embodiments, the OFDM symbol can be searched by performing correlation calculation on the cyclic prefix of the preset symbol and the tail data corresponding to the cyclic prefix, and the OFDM symbol can be searched within the preset length by performing sliding correlation calculation within the preset length of the NR waveform data.

In some embodiments, when the OFDM symbol in the NR waveform data includes a first cyclic prefix or a second cyclic prefix with different lengths, that is, when the cyclic prefix of the OFDM symbol is a normal cyclic prefix, the length of the preset symbol is the length of the OFDM symbol including the short CP, the length of the cyclic prefix of the preset symbol is obtained to be the same as the short CP, and at this time, correlation calculation is performed on the cyclic prefix of the preset symbol and tail data corresponding to the cyclic prefix at the position of the half subframe header, so that the preset symbol cannot be overlapped with the OFDM symbol. Therefore, when the preset symbol is overlapped with the OFDM symbol of the non-half subframe head, obvious correlation degree is higher, and when the position of the half subframe head is lower, the OFDM symbol can be searched within the preset length based on the obvious correlation degree, and the half subframe can be searched within the preset length based on the searching result of the OFDM symbol.

Referring to fig. 3 again, in some embodiments, when the cyclic prefix of the OFDM symbol is a normal cyclic prefix, the preset position may also be a position of a half-subframe header from the starting point of the NR waveform data, and the length of at least one preset symbol is a length of one half-subframe minus one half-subframe header in the NR waveform data. At this time, when the current preset position is at a position one half subframe head away from the half subframe, at least one preset symbol coincides with at least one OFDM symbol in the NR waveform data, and when the current preset position is at other positions, at least one preset symbol does not coincide with at least one OFDM symbol in the NR waveform data completely, so that the half subframe can be searched directly within the preset length based on the current preset position.

As can be seen from the above embodiments, by configuring the length of at least one preset symbol, the OFDM symbol may be searched within the preset length, and the half sub-frame may also be searched within the preset length.

Step 300: a correlation search is performed to complete the synchronization.

In some embodiments, a target preset position with the highest correlation within a preset length and meeting a preset threshold is obtained. When searching for the OFDM symbol within the preset length, the target preset position is the boundary position of one NR waveform symbol in the NR waveform data, and when searching for the half subframe within the preset length, the boundary position of one half subframe in the NR waveform data can be obtained based on the target preset position, for example, when the length of at least one preset symbol is the length of one half subframe minus one half subframe head in the NR waveform data, the position of the target preset position plus the length of one half subframe head is the boundary position of one half subframe. The half sub-frame and each OFDM symbol are fixed under the fixed communication parameters, so that the boundary of each half sub-frame can be obtained based on the boundary of one half sub-frame, and the boundary position of each NR waveform symbol can be obtained based on the boundary position of one NR waveform symbol.

In some embodiments, the structure of the half-frame is shown in fig. 2, and the half-frame length is fixed and denoted as L. Wherein CP0 is a long CP, the length is denoted as CP 0L; CP1 is a short CP and the length is denoted CP 1L. Only the first OFDM symbol (half-subframe header) in a half-subframe is a long CP, and the other OFDM symbols are short CPs. The length of the IFFT is denoted ifft_l. Assume that there are N OFDM symbols in one half subframe, and the number (denoted as N) is 0-N-1. The boundary of the 0 th OFDM symbol is 0 and the symbol boundary of the n (n > 0) th OFDM symbol is: CP0 l+ (n-1) CP1 l+n IFFT L. For example, the half-subframe length is calculated according to the subcarrier spacing and the bandwidth, for example, the 100MHz bandwidth (the sampling rate is 122.88 MHz), when the subcarrier spacing is 30kHz, CP 0L is 352 data points, CP 1L is 288 data points, IFFT L is 4096 data points, and L is 61440 data points.

In some embodiments, when the highest correlation within the preset length does not meet the preset threshold, it indicates that no OFDM symbol is searched within the preset length, for example, when the highest correlation is lower than 0.8, it is considered that the preset threshold is not met. At this time, the preset length is extended and the sliding correlation calculation is continued until the preset length is extended to the length of one frame of data. For example, the preset length is the length of one half subframe, when no OFDM symbol is searched in the length of the half subframe, sliding correlation calculation can be continuously performed on the length of the next half subframe to obtain the correlation degree of each position in the next half subframe until the preset length reaches the length of one frame of data, and if no OFDM symbol is searched at this time, synchronization failure is indicated. In some embodiments, if there are a plurality of target preset positions with the highest correlation within the preset length and satisfying the preset threshold, one of the target preset positions is selected.

Although the boundary position of each OFDM symbol or half-subframe can be obtained based on the target preset position, since both the OFDM symbol and the half-subframe are repeatedly appeared, the specific position of the OFDM symbol or half-subframe in one frame of data is not known, and therefore the position of the frame header in the NR waveform data cannot be obtained. In some embodiments, the boundary position of the OFDM symbol or the half subframe may be searched by a pilot signal corresponding to the NR waveform data, and a specific position of the OFDM symbol or the half subframe in one frame of data may be determined based on the pilot signal, so that the position of the frame header in the NR waveform data may be obtained, so as to complete synchronization of the NR waveform data.

In some embodiments, the position of the boundary of a half subframe is obtained by performing correlation search on the boundary position of the half subframe by using the pilot signal in each pilot half subframe in at least one frame of data, and the position of the pilot half subframe with the greatest correlation is obtained as the position of the boundary position of the half subframe in one frame of data, and then the position of the frame header in the NR waveform data is obtained from the boundary position of the half subframe based on the position. For example, one frame of data in NR waveform data may be divided into 20 half-subframes, each numbered 0 to 19, assuming that the boundary position of the half-subframe where the correlation search is performed is the 0 th half-subframe. And then carrying out correlation search on the boundary position of the half sub-frame by using a pilot frequency half sub-frame with the number of 0-19 in one frame of data by using a local pilot frequency signal, wherein the pilot frequency half-frame number with the largest correlation degree is the half sub-frame number corresponding to the boundary position of the half sub-frame, for example, when the correlation degree is the largest in the number 5, the half sub-frame number corresponding to the boundary position of the half sub-frame is 5, and then obtaining the position of the frame head in the NR waveform data according to the number 5 and the boundary position of the half sub-frame.

In some embodiments, the boundary position of the OFDM symbol is searched for by performing correlation search on each pilot half-frame of the pilot signal in at least one frame of data, to obtain the position of the pilot half-frame with the greatest correlation in one frame of data, and to be the half-frame position of the boundary position of the OFDM symbol in one frame of data. And then, carrying out correlation search on the boundary position of the OFDM symbol through each pilot symbol of the pilot signal in the pilot half sub-frame with the maximum correlation degree, obtaining the position of the pilot symbol with the maximum correlation degree in the pilot half sub-frame, and taking the position of the boundary position of the OFDM symbol in the half sub-frame position. The position of the frame header in the NR waveform data is obtained from the boundary position of the OFDM symbol based on the half-subframe position and the position of the boundary position of the OFDM symbol in the half-subframe position. For example, there are N OFDM symbols in one half subframe in the pilot signal, the symbol number is 0-N-1, and when the correlation degree is maximum in the half subframe number 5, the half subframe number corresponding to the boundary position of the OFDM symbol is 5, and when the correlation degree is maximum in the symbol number 5, the symbol number corresponding to the boundary position of the OFDM symbol is 5, and then the position of the frame header in the NR waveform data can be obtained according to the symbol number 5, the half subframe number 5 and the boundary position of the OFDM symbol.

As can be seen from the above embodiments, when knowing the boundary position of the half subframe, the number of the boundary position of the half subframe is obtained by performing correlation search through the pilot signal, thereby obtaining the position of the frame header in the NR waveform data. When the boundary position of the OFDM symbol is known, the pilot signal is used for carrying out correlation search to obtain the number of the half subframe to which the boundary position of the OFDM symbol belongs, and then the correlation search is carried out again to obtain the symbol number of the boundary position of the OFDM symbol in the half subframe to which the boundary position of the OFDM symbol belongs, so that the position of the frame head in the NR waveform data is obtained.

In some embodiments, a second number of pilot symbols in the pilot signal is determined based on a first number of Resource Blocks (RBs) of OFDM symbols in the NR waveform data, the first number being inversely related to the second number, and a correlation search is performed on boundary positions of the OFDM symbols by the second number of pilot symbols. In some embodiments, when the number of RBs of the OFDM symbol is 16, the number of pilot symbols required is at least 1, when the number of RBs is 8, the number of pilot symbols required is at least 2, and when the number of RBs is 1, the number of pilot symbols required is at least 8, so the fewer the number of RBs, the more pilot symbols required.

Referring to fig. 4, in some embodiments, when performing correlation search on the boundary positions of the OFDM symbols through each pilot symbol in the pilot half subframe, the boundary positions of the OFDM symbols and the boundary positions of a plurality of subsequent OFDM symbols satisfying a preset condition, for example, the boundary positions of a plurality of OFDM symbols having corresponding pilot symbols, are then respectively and correspondingly performing correlation calculation on each of the plurality of continuous second number of pilot symbols one by one, and the results of each correlation calculation are multiplied to obtain the final correlation degree of the current second number of pilot symbols. And after each continuous second number of pilot symbols in each pilot symbol are respectively subjected to correlation calculation, determining the position of the boundary position of the OFDM symbol in the NR waveform data based on the position of the second number of pilot symbols corresponding to the highest final correlation degree so as to complete correlation search. For example, the position of the first pilot symbol of the second number of pilot symbols in the pilot signal is taken as the position of the boundary position of the OFDM symbol in the NR waveform data. For example, in fig. 4, a correlation result corrm is calculated for each large frame, and the final correlation corr=corr0×corr1×corr2× … ×corrm.

In this embodiment, when one OFDM symbol has a small number of RBs, one pilot symbol has a small number of pilot data points, and the calculated correlation is easily affected by noise, so that it cannot be distinguished from noise. When a plurality of continuous pilot symbols are selected, each pilot symbol is related separately, each pilot symbol has a degree of relativity, but is indistinguishable due to noise influence, if the plurality of pilot symbols are multiplied, the plurality of pilot symbols are amplified mutually, so that the plurality of pilot symbols can be distinguished from noise, the noise is random, if the plurality of pilot symbols are multiplied, some pilot symbols are amplified, some pilot symbols are reduced, and therefore, the final basic condition is maintained. Referring to fig. 5 and 6, fig. 5 shows the calculated correlation of one pilot symbol when the number of RBs is 1, the calculated correlation is obviously affected by noise, and fig. 6 shows the calculated correlation of four pilot symbols when the number of RBs is 1, the calculated correlation is obviously enhanced and is obviously distinguished from noise.

In some embodiments, each pilot symbol may be mixed, and then pilot information related to the pilot symbol is extracted from the mixed signal, so that noise in the pilot information is less due to the fact that the pilot information is extracted after mixing, and accordingly, the correlation is recalculated based on the pilot information, and therefore the calculation accuracy is high.

As can be seen from the above embodiments, when performing the correlation search on the OFDM symbol based on the pilot symbol in the pilot signal, when performing the correlation search with a plurality of continuous pilot symbols, the influence of noise can be reduced, so that the position of the OFDM symbol can be accurately searched for to increase the synchronization accuracy.

Some embodiments provide a computer readable storage medium having a program stored thereon, the program being executable by a processor to implement the signal synchronization method described above.

Those skilled in the art will appreciate that all or part of the functions of the various methods in the above embodiments may be implemented by hardware, or may be implemented by a computer program. When all or part of the functions in the above embodiments are implemented by means of a computer program, the program may be stored in a computer readable storage medium, and the storage medium may include: read-only memory, random access memory, magnetic disk, optical disk, hard disk, etc., and the program is executed by a computer to realize the above-mentioned functions. For example, the program is stored in the memory of the device, and when the program in the memory is executed by the processor, all or part of the functions described above can be realized. In addition, when all or part of the functions in the above embodiments are implemented by means of a computer program, the program may be stored in a storage medium such as a server, another computer, a magnetic disk, an optical disk, a flash disk, or a removable hard disk, and the program in the above embodiments may be implemented by downloading or copying the program into a memory of a local device or updating a version of a system of the local device, and when the program in the memory is executed by a processor.

The foregoing description of specific examples has been presented only to aid in the understanding of the present application and is not intended to limit the present application. Several simple deductions, modifications or substitutions may also be made by the person skilled in the art to which the present application pertains, according to the idea of the present application.

Claims

1. A signal synchronization method for use in an NR wireless network, the signal synchronization method comprising:

2. The signal synchronization method of claim 1, wherein the predetermined length ranges from a length of one NR waveform symbol in the NR waveform data to a length of one frame data.

3. The signal synchronization method according to claim 2, wherein when the highest correlation within the preset length does not satisfy the preset threshold, the preset length is extended and the sliding correlation calculation is continued until the preset length is extended to a length of one frame of data.

4. The signal synchronization method of claim 1, wherein NR waveform symbols in the NR waveform data include a first cyclic prefix or a second cyclic prefix, and when the first cyclic prefix is greater than a length of the second cyclic prefix, the length of the preset symbol is the length of the NR waveform symbol including the second cyclic prefix, and the length of the cyclic prefix of the preset symbol is the same as the length of the second cyclic prefix.

5. The signal synchronization method of claim 4 wherein the length of the at least one predetermined symbol is a length of one half subframe minus one half subframe header in the NR waveform data.

6. The signal synchronization method according to claim 5, wherein the performing the correlation search by the pilot signal corresponding to the NR waveform data based on the target preset position to obtain the position of the frame header in the NR waveform data includes:

7. The signal synchronization method according to claim 1, wherein the performing the correlation search by the pilot signal corresponding to the NR waveform data based on the target preset position to obtain the position of the frame header in the NR waveform data includes:

8. The signal synchronization method of claim 7 wherein a second number of pilot symbols in said pilot signal is determined based on a first number of resource blocks of NR waveform symbols in said NR waveform data, said first number being inversely related to said second number, and wherein a correlation search is performed on boundary positions of said NR waveform symbols by said second number of pilot symbols.

9. The signal synchronization method of claim 8, wherein said performing a correlation search on boundary positions of said NR waveform symbols by each pilot symbol of said pilot signal in said pilot half subframe having a maximum correlation comprises:

10. A computer readable storage medium, characterized in that the medium has stored thereon a program executable by a processor to implement the method of any of claims 1-9.