CN115396070B - Signal synchronization method, device and storage medium - Google Patents

Signal synchronization method, device and storage medium Download PDF

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Publication number
CN115396070B
CN115396070B CN202110548023.6A CN202110548023A CN115396070B CN 115396070 B CN115396070 B CN 115396070B CN 202110548023 A CN202110548023 A CN 202110548023A CN 115396070 B CN115396070 B CN 115396070B
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time slot
target
demodulation reference
signal
reference signals
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CN115396070A (en
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张祖禹
李雪莲
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Datang Linktester Technology Co ltd
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Datang Linktester Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/50—Testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes

Abstract

The present disclosure provides a signal synchronization method, a device and a storage medium, where the method includes obtaining a physical uplink shared channel PUSCH signal and a local plurality of first demodulation reference signals DMRS Loc The method comprises the steps of carrying out a first treatment on the surface of the Carrying out symbol head searching on the PUSCH signal to obtain a plurality of candidate time slot positions corresponding to the PUSCH signal; resolving to obtain multiple second demodulation reference signals DMRS corresponding to multiple candidate slot positions Rec The method comprises the steps of carrying out a first treatment on the surface of the For a plurality of second demodulation reference signals DMRS Rec Respectively performing cyclic shift processing of the frequency domains to obtain a plurality of corresponding target demodulation reference signals; for a plurality of first demodulation reference signals DMRS Loc Performing conjugate multiplication on the target demodulation reference signals to obtain a plurality of corresponding first correlation values; and determining a target slot position from among a plurality of candidate slot positions according to the plurality of first correlation values, wherein the target slot position is used for signal synchronization. The accuracy of time slot synchronization of the PUSCH signals of the terminal comprehensive tester can be effectively improved, and therefore the time slot synchronization effect of the PUSCH signals is effectively improved.

Description

Signal synchronization method, device and storage medium
Technical Field
The disclosure relates to the technical field of communication, and in particular relates to a signal synchronization method, a signal synchronization device and a storage medium.
Background
The time slot synchronization of the physical uplink shared channel (Physical Uplink Shared Channel, PUSCH) signal of the non-signaling terminal integrated tester for the New air interface (New Radio, NR), that is, when the terminal integrated tester measures the PUSCH signal, the signal synchronization needs to be maintained between the terminal integrated tester and the terminal device.
In the related art, a time domain sliding correlation method is generally adopted to assist in slot synchronization under the condition that a local demodulation reference signal (Demodulation Reference Signal, DMRS) is known.
In this way, the time slot synchronization effect of the PUSCH signal may be inaccurate, thereby resulting in poor time slot synchronization effect of the PUSCH signal.
Disclosure of Invention
The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art.
Therefore, an object of the present disclosure is to provide a signal synchronization method, apparatus and storage medium, which can effectively improve accuracy of time slot synchronization of a PUSCH signal of a terminal comprehensive tester, thereby effectively improving time slot synchronization effect of the PUSCH signal.
To achieve the above object, a signal synchronization method according to an embodiment of a first aspect of the present disclosure includes: acquiring Physical Uplink Shared Channel (PUSCH) signals and local multiple first demodulation reference signals (DMRS) Loc The method comprises the steps of carrying out a first treatment on the surface of the Performing symbol head searching on the PUSCH signal to obtain a plurality of candidate time slot positions corresponding to the PUSCH signal; analyzing and obtaining a plurality of second demodulation reference signals (DMRS) corresponding to the plurality of candidate slot positions from the PUSCH signals Rec The method comprises the steps of carrying out a first treatment on the surface of the For the plurality of second demodulation reference signals DMRS Rec Respectively performing cyclic shift processing of the frequency domains to obtain a plurality of corresponding target demodulation reference signals; for the plurality of first demodulation reference signals DMRS Loc Performing conjugate multiplication on the target demodulation reference signals to obtain a plurality of corresponding first correlation values; and determining a target time slot position from among the candidate time slot positions according to the first correlation values, wherein the target time slot position is used for signal synchronization of the PUSCH signal.
To achieve the above object, a signal synchronization device according to an embodiment of a second aspect of the present disclosure includes: an acquisition unit, configured to acquire a physical uplink shared channel PUSCH signal and a local plurality of first demodulation reference signals DMRS Loc The method comprises the steps of carrying out a first treatment on the surface of the A searching unit, configured to perform symbol head searching on the PUSCH signal to obtain a plurality of candidate slot positions corresponding to the PUSCH signal; an parsing unit, configured to parse the PUSCH signal to obtain a plurality of second demodulation reference signals DMRS corresponding to the plurality of candidate slot positions, respectively Rec The method comprises the steps of carrying out a first treatment on the surface of the A first processing unit for performing demodulation of the plurality of second demodulation reference signals (DMRS) Rec Respectively performing cyclic shift processing of the frequency domains to obtain a plurality of corresponding target demodulation reference signals; a second processing unit for performing demodulation on the plurality of first demodulation reference signals (DMRS) Loc Performing conjugate multiplication on the target demodulation reference signals to obtain a plurality of corresponding first correlation values; and (3) determiningAnd the determining unit is used for determining a target time slot position from the candidate time slot positions according to the first correlation values, wherein the target time slot position is used for carrying out signal synchronization on the PUSCH signals.
To achieve the above object, a signal synchronization device according to an embodiment of a third aspect of the present disclosure includes: memory, transceiver, processor: a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations: acquiring Physical Uplink Shared Channel (PUSCH) signals and local multiple first demodulation reference signals (DMRS) Loc The method comprises the steps of carrying out a first treatment on the surface of the Performing symbol head searching on the PUSCH signal to obtain a plurality of candidate time slot positions corresponding to the PUSCH signal; analyzing and obtaining a plurality of second demodulation reference signals (DMRS) corresponding to the plurality of candidate slot positions from the PUSCH signals Rec The method comprises the steps of carrying out a first treatment on the surface of the For the plurality of second demodulation reference signals DMRS Rec Respectively performing cyclic shift processing of the frequency domains to obtain a plurality of corresponding target demodulation reference signals; for the plurality of first demodulation reference signals DMRS Loc Performing conjugate multiplication on the target demodulation reference signals to obtain a plurality of corresponding first correlation values; and determining a target time slot position from among the candidate time slot positions according to the first correlation values, wherein the target time slot position is used for signal synchronization of the PUSCH signal.
A fourth aspect of the disclosure provides a processor-readable storage medium storing a computer program for causing the processor to perform: the embodiment of the first aspect of the disclosure provides a signal synchronization method.
Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
Fig. 1 is a schematic flow chart of a signal synchronization method according to an embodiment of the disclosure;
fig. 2 is a flow chart illustrating a signal synchronization method according to another embodiment of the present disclosure;
fig. 3 is a flow chart illustrating a signal synchronization method according to another embodiment of the present disclosure;
fig. 4 is a flowchart of a signal synchronization method according to another embodiment of the disclosure;
FIG. 5 is a flow chart of a signal synchronization method in an embodiment of the present disclosure;
FIG. 6 is a graph of correlation results for sliding different window lengths in an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of a position of a symbol maximum correlation value in an embodiment of the disclosure;
fig. 8 is a demodulation reference signal DMRS received in an embodiment of the present disclosure Rec DMRS with local demodulation reference signal Loc Is a correlation value diagram of (1);
fig. 9 is a schematic structural diagram of a signal synchronization device according to an embodiment of the disclosure;
fig. 10 is a schematic structural diagram of a signal synchronization device according to another embodiment of the present disclosure.
Detailed Description
Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present disclosure and are not to be construed as limiting the present disclosure. On the contrary, the embodiments of the disclosure include all alternatives, modifications, and equivalents as may be included within the spirit and scope of the appended claims.
Fig. 1 is a flowchart of a signal synchronization method according to an embodiment of the disclosure.
It should be noted that, the execution main body of the signal synchronization method in this embodiment is a signal synchronization device, and the device may be implemented in a software and/or hardware manner, and the device may be configured in a terminal comprehensive tester, where the terminal comprehensive tester may be used to perform performance test on a terminal device.
The terminal device according to the embodiments of the present disclosure may be a device that provides voice and/or data connectivity to a user, a handheld device with wireless connection functionality, or other processing device connected to a wireless modem, etc. The names of the terminal devices may also be different in different systems.
In a 5G system, for example, a terminal device may be referred to as a User Equipment (UE). The wireless terminal device may communicate with one or more Core Networks (CNs) via a radio access Network (Radio Access Network, RAN), which may be mobile terminal devices such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, e.g., portable, pocket, hand-held, computer-built-in or vehicle-mounted mobile devices that exchange voice and/or data with the radio access Network.
Such as personal communication services (Personal Communication Service, PCS) phones, cordless phones, session initiation protocol (Session Initiated Protocol, SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital assistants (Personal Digital Assistant, PDAs), and the like. The wireless terminal device may also be referred to as a system, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile), remote station (remote station), access point (access point), remote terminal device (remote terminal), access terminal device (access terminal), user terminal device (user terminal), user agent (user agent), user equipment (user device), and embodiments of the present disclosure are not limited.
As shown in fig. 1, the signal synchronization method includes:
s101: acquiring Physical Uplink Shared Channel (PUSCH) signals and local multiple first demodulation reference signals (DMRS) Loc 。
Wherein, the PUSCH signal specifically means: for the New air interface (New Radio,NR) physical uplink shared channel (Physical Uplink Shared Channel, PUSCH) signals of the terminal integrated tester, for example, when the terminal integrated tester is adopted to interact with the terminal equipment, the PUSCH signals of the terminal integrated tester can be captured, and then, the acquisition of a plurality of first demodulation reference signals DMRS local to the terminal integrated tester can be triggered Loc Among other things, demodulation reference signals (Demodulation Reference Signal, DMRS) may be used for correlated demodulation of PUSCH signals and PUCCH channels.
In the embodiment of the disclosure, the multiple demodulation reference signals DMRS local to the terminal comprehensive tester may be referred to as multiple first demodulation reference signals DMRS Loc 。
The above-mentioned DMRS acquiring PUSCH signals and local multiple first demodulation reference signals Loc Then, a subsequent frequency domain sliding correlation method can be triggered to assist in time slot synchronization.
S102: and carrying out symbol head searching on the PUSCH signal to obtain a plurality of candidate time slot positions corresponding to the PUSCH signal.
The above-mentioned DMRS acquiring PUSCH signals and local multiple first demodulation reference signals Loc Then, the symbol head search for the PUSCH signal may be triggered in real time to obtain a plurality of candidate slot positions corresponding to the PUSCH signal.
The symbol heads are searched, so that the positions of a plurality of symbol heads obtained by searching can be used as candidate time slot positions, wherein the candidate time slot positions can be used as references when signal time slot synchronization is carried out, and the symbol heads can be concretely OFDM symbol heads in an orthogonal frequency division multiplexing technology (Orthogonal Frequency Division Multiplexing, OFDM).
In the embodiment of the present disclosure, after the PUSCH signal is obtained, the symbol head search may be performed on the PUSCH signal to preliminarily determine N sym And taking the possible slot starting positions as a plurality of candidate slot positions.
In some embodiments, the symbol header search is performed on the PUSCH signal to obtain a plurality of candidate slot positions corresponding to the PUSCH signal, which may be performed on the PUSCH signal to obtain a plurality of initial Cyclic Prefix (CP) data pairs, and one symbol is slid on each of the plurality of initial CP data pairs to obtain a plurality of corresponding target CP data pairs, the correlation summation is performed on the plurality of initial CP data pairs and the plurality of target CP data pairs to obtain a plurality of second correlation values, and the slot position of the symbol header corresponding to the second correlation value of the maximum value in the plurality of second correlation values is used as a reference slot position, and the plurality of candidate slot positions are determined according to the reference slot position, so that the symbol header search is performed on the PUSCH signal quickly to determine a plurality of candidate slot positions corresponding to the PUSCH signal, and a more accurate target slot position is determined in an auxiliary subsequent method according to the frequency domain sliding correlation.
For example, the PUSCH signal r (n) is 2*N slot Long, since the data of the tail of the OFDM signal is identical to the CP data of the symbol header, and the distance (N CP +N FFT ) The same, wherein N cp Representing the length of the initial CP data pair, N FFT The number of sampling points representing the fast fourier transform (Fast Fourier Transform, FFT) is thus in the embodiment of the disclosure, after the PUSCH signal is parsed to obtain a plurality of initial CP data pairs, and one symbol is slid over each of the plurality of initial CP data pairs to obtain a corresponding plurality of target CP data pairs, the CP sliding correlation manner may be adopted to obtain the initial N sym Position P of each time slot k And then can also support the following P k The CP sliding correlation is repeatedly carried out, and the method is carried out on the initial N sym Position P of each time slot k Updating and updating the obtained time slot position P k As a plurality of candidate slot positions corresponding to the PUSCH signal.
Of course, any other possible method may be used to perform the symbol header search on the PUSCH signal to obtain a plurality of candidate slot positions corresponding to the PUSCH signal, which is not limited.
The plurality of Cyclic Prefix (CP) data pairs obtained by parsing the PUSCH signal may be referred to as a plurality of initial CP data pairs, and correspondingly, the plurality of initial CP data pairs may be referred to as a plurality of corresponding target CP data pairs by performing sliding correlation processing on the plurality of initial CP data pairs.
The cyclic prefix CP data pair is formed by copying signals at the tail of a symbol of an Orthogonal Frequency Division Multiplexing (OFDM) technology to the head, and the length of the CP is mainly two, namely a conventional cyclic prefix (Normal Cyclic Prefix) and an extended cyclic prefix (Extended Cyclic Prefix). Taking the NR sub-carrier spacing of 30kHz as an example, the conventional cyclic prefix length is 2.86/2.34 μs and the extended cyclic prefix length is 8.33 μs. The cyclic prefix may be associated with other multipath component information to obtain complete information. In addition, the cyclic prefix can realize the pre-estimation of time and frequency synchronization.
S103: analyzing and obtaining a plurality of second demodulation reference signals (DMRS) corresponding to a plurality of candidate slot positions from the PUSCH signals Rec 。
After the PUSCH signal is obtained, the plurality of second demodulation reference signals DMRS corresponding to the plurality of candidate slot positions can be obtained from the PUSCH signal by analysis Rec Wherein, the demodulation reference signal is obtained by analyzing the PUSCH signal and can be called as a second demodulation reference signal DMRS Rec Since demodulation reference signals (Demodulation Reference Signal, DMRS) can be used for correlated demodulation of PUSCH signals and PUCCH channels, in embodiments of the present disclosure, multiple second demodulation reference signals DMRS corresponding to multiple candidate slot positions, respectively, can be determined Rec 。
Since the above-mentioned candidate slot positions may be corresponding to the real slot heads, in the embodiment of the disclosure, the analysis is supported to obtain multiple second demodulation reference signals DMRS corresponding to the candidate slot positions Rec The subsequent frequency domain correlation method is performed in order to determine the position of the real slot head, which may be referred to as the target slot position, from among a plurality of candidate slot positions.
For example, assume P 1 For the position of the real time slot head, acquiring the sum P 1 Corresponding second demodulation reference signal DMRS Rec . And due to the local first demodulation reference signal DMRS Loc Is known and a second demodulation reference signal DMRS in the PUSCH signal Rec Is generated by the method and the first demodulation reference signal DMRS generated locally Loc In the same way, so that the second demodulation reference signal DMRS Rec 10 x 2 to local generation μ First demodulation reference signal DMRS Loc And is identical to any one of the above.
In the embodiment of the present disclosure, a plurality of second demodulation reference signals DMRS corresponding to a plurality of candidate slot positions are obtained from the PUSCH signal by parsing Rec And then, triggering and executing the subsequent steps of respectively carrying out frequency domain cyclic shift processing on the plurality of second demodulation reference signals DMRSREc so as to obtain a plurality of corresponding target demodulation reference signals.
S104: for a plurality of second demodulation reference signals DMRS Rec And respectively performing cyclic shift processing of the frequency domains to obtain a plurality of corresponding target demodulation reference signals.
For example, the DMRS may be used for a plurality of second demodulation reference signals Rec Respectively performing Fourier transform processing to obtain multiple second demodulation reference signals DMRS Rec Respectively transformed to the frequency domain, thereby performing a plurality of first demodulation reference signals (DMRS) in the frequency domain Loc And a plurality of transformed second demodulation reference signals DMRS Rec And carrying out correlation processing of the frequency domain.
In the embodiment of the disclosure, since the plurality of second demodulation reference signals (DMRS) are realized Rec Respectively performing Fourier transform processing to obtain multiple second demodulation reference signals DMRS Rec Respectively transformed to the frequency domain, thereby performing a plurality of first demodulation reference signals (DMRS) in the frequency domain Loc And a plurality of transformed second demodulation reference signals DMRS Rec The correlation processing of the frequency domain is carried out, so that the technical problem possibly existing in the method of time domain sliding correlation can be effectively avoided, and the PUSCH signal in the new air interface NR can be accurately realized in the scheduling resourceThe source is 1RB signal timing synchronization.
S105: and performing conjugate multiplication on the plurality of first demodulation reference signals DMRSLOC and the plurality of target demodulation reference signals to obtain a plurality of corresponding first correlation values.
The above-mentioned method is used for the plurality of second demodulation reference signals DMRS Rec After respectively performing cyclic shift processing of the frequency domain to obtain a plurality of corresponding target demodulation reference signals, the plurality of first demodulation reference signals DMRS can be triggered Loc And performing conjugate multiplication on the plurality of target demodulation reference signals to obtain a plurality of corresponding first correlation values.
Wherein, for a plurality of second demodulation reference signals DMRS Rec The cyclic shift processing of the frequency domains, respectively, can be explained as: first for multiple second demodulation reference signals DMRS Rec Respectively performing Fourier frequency domain transformation processing to obtain a plurality of corresponding initial frequency domain signals, wherein each initial frequency domain signal and a second demodulation reference signal (DMRS) Rec Correspondingly, the multiple initial frequency domain signals are respectively circularly shifted by the set point number to obtain multiple target demodulation reference signals corresponding to the initial frequency domain signals, thereby adopting multiple target demodulation reference signals and multiple first demodulation reference signals DMRS Loc Conjugate multiplication is performed to determine a plurality of first correlation values that may be used in an assisted manner to determine the position of the real slot head, i.e. the target slot position, from among a plurality of candidate slot positions, as will be described in more detail with reference to the following embodiments.
S106: and determining a target time slot position from the plurality of candidate time slot positions according to the plurality of first correlation values, wherein the target time slot position is used for signal synchronization of the PUSCH signal.
Optionally, the candidate time slot position corresponding to the first correlation value with the largest value may be used as the target time slot position, and after the target time slot position is determined from the plurality of candidate time slot positions, a target time slot number corresponding to the target time slot position may be determined, where the target time slot position and the target time slot number are commonly used for signal synchronization on the PUSCH signal, so that accuracy of determining the target time slot position may be effectively improved, and the target time slot number corresponding to the target time slot position may be determined, so that signal timing synchronization may be assisted by combining the target time slot position and the target time slot number, and completeness of the method may be effectively ensured.
In this embodiment, the PUSCH signal and the local DMRS are obtained Loc Performing symbol head search on the PUSCH signal to obtain a plurality of candidate time slot positions corresponding to the PUSCH signal, and analyzing the PUSCH signal to obtain a plurality of second demodulation reference signals (DMRS) corresponding to the candidate time slot positions Rec For a plurality of second demodulation reference signals DMRS Rec Respectively performing cyclic shift processing of frequency domains to obtain multiple corresponding target demodulation reference signals, and performing DMRS (digital Mobile radio standard) on multiple first demodulation reference signals Loc And determining a target time slot position from a plurality of candidate time slot positions according to the first correlation values, wherein the target time slot position is used for carrying out signal synchronization on the PUSCH signal, and the time slot timing synchronization of the signal can be assisted based on the cyclic shift processing of the frequency domain, so that the timing synchronization under the large frequency is more accurate, the accuracy of the time slot synchronization of the PUSCH signal of the terminal comprehensive tester is effectively improved, and the time slot synchronization effect of the PUSCH signal is effectively improved.
Fig. 2 is a flowchart of a signal synchronization method according to another embodiment of the disclosure.
As shown in fig. 2, the signal synchronization method includes:
s201: and determining the position of a time slot head in the PUSCH signal.
For example, the PUSCH signal may be subjected to corresponding signal analysis to determine that the slot head position in the PUSCH signal is
S202: and sequentially analyzing a plurality of CP data pairs from the PUSCH signal by taking the slot head position as a reference position to obtain a plurality of initial CP data pairs.
The corresponding signal analysis processing is carried out on the PUSCH signal to determine that the time slot head position in the PUSCH signal isThe slot head position may be used as a reference position, and a plurality of CP data pairs may be sequentially analyzed from the PUSCH signal as a plurality of initial CP data pairs.
For example, at a slot head positionSequentially taking out N after proceeding on the basis of (2) sym And CP data pairs as a plurality of initial CP data pairs.
S203: one symbol is respectively slid to the plurality of initial CP data pairs to obtain a corresponding plurality of target CP data pairs.
In the above method, a plurality of CP data pairs are sequentially analyzed from the PUSCH signal as a plurality of initial CP data pairs using the slot head position as a reference position, and then one symbol may be slid with respect to each of the plurality of initial CP data pairs to obtain a corresponding plurality of target CP data pairs, that is, one symbol may be slid with respect to each of the plurality of initial CP data pairs at a time of one sliding, and after one symbol is slid at a time, the obtained plurality of initial CP data pairs may be respectively used as a corresponding plurality of target CP data pairs.
The CP correlation may be performed after sliding one symbol for the first time, or may be used to determine a reference slot position, and the CP correlation may be performed after sliding one symbol for the next other time, or may be used to perform corresponding update adjustment on the candidate slot position determined subsequently.
Wherein the number of slides may be W f Reference may be made in particular to the description of the subsequent steps.
S204: and performing correlation summation processing on the plurality of initial CP data pairs and the plurality of target CP data pairs to obtain a plurality of second correlation values.
And sliding one symbol on each of the plurality of initial CP data pairs to obtain a plurality of corresponding target CP data pairs, specifically sliding one symbol on each of the plurality of initial CP data pairs to obtain a plurality of corresponding target CP data pairs, performing a correlation summation process on the plurality of initial CP data pairs and the plurality of target CP data pairs, using a plurality of correlation values obtained by the correlation summation process as a plurality of second correlation values, and using the plurality of second correlation values to assist in determining the reference slot head position.
S205: and taking the time slot position of the symbol head corresponding to the second correlation value with the largest value as a reference time slot position.
The reference slot position is the slot position corresponding to the first symbol head in the PUSCH signal.
It can be appreciated that the cyclic prefix CP data pair includes: data pair a and data pair B (i.e., data pair a and data pair B may form a cyclic prefix CP data pair), the amount of data between data a and data B is equal, such that in embodiments of the present disclosure such characteristics of an OFDM signal may be employed, N sym Simultaneously sliding one symbol by the initial CP data pairs to obtain a plurality of target CP data pairs, carrying out correlation summation on the plurality of initial CP data pairs and the plurality of target CP data pairs to obtain a plurality of second correlation values, and taking the time slot position of the symbol head corresponding to the maximum second correlation value as a reference time slot position P 1 。
S206: and updating the reference time slot position according to the time slot head position to obtain a first candidate time slot position.
The above-mentioned method includes performing correlation summation on multiple initial CP data pairs and multiple target CP data pairs to obtain multiple second correlation values, and using the time slot position corresponding to the symbol head with the largest second correlation value as reference time slot position P 1 The reference time slot position can be updated according to the time slot head position to obtain the first candidate time slot position, so that the accuracy of the candidate time slot position is effectively improved.
For example, due to the above-mentioned offset backward in extracting the symbol headPoint, the reference slot position P can be determined 1 The updating is as follows:
wherein the updated first candidate slot position may be P 1 And (3) withAs shown in the above formula (1).
S207: a target value is determined, the target value being the sum of the length of the initial CP data pair and the number of sampling points of the fast fourier transform FFT.
The updating of the reference time slot position according to the time slot head position to obtain the first candidate time slot position can determine the length of the initial CP data pair and the sum of the sampling points of the FFT, wherein the length N of the initial CP data pair cp The number of sampling points of the FFT can be N FFT The sum of the length of the initial CP data pair and the number of samples of the FFT can be expressed as: n (N) cp+ N FFT 。
S208: and adjusting the first candidate time slot position at least once according to the target value to obtain second candidate time slot positions after each adjustment, wherein the first candidate time slot positions and the second candidate time slot positions after each adjustment jointly form a plurality of candidate time slot positions.
The above-mentioned updating the reference time slot position according to the time slot head position to obtain the first candidate time slot position, and after determining the length of the initial CP data pair and the sum of the sampling points of the FFT, at least one adjustment can be performed on the first candidate time slot position according to the target value to obtain the second candidate time slot position after each adjustment.
For example, in the signal of the New Radio, NR, after the frame structure of the signal is fixed, the length and the starting position of each OFDM symbol are also fixed, so in the embodiment of the disclosure, the remaining N may be obtained quickly by the following formula (2) sym -slot position of 1 symbol.
P k ＝P k-1 +(N CP +N FFT ) ； (2)
In other embodiments, in practical applications, due to the influence of noise, frequency offset, etc. in the environment, not the actual slot position of each symbol head is equal to the calculated slot position, so in the embodiments of the present disclosure, P may also be traversed k Slide W f The second CP correlation is carried out again, the maximum second correlation value determined after each sliding corresponds to the time slot position of the symbol head, namely the time slot position P which can be used as the second candidate time slot position after updating k 。
In this embodiment, a plurality of initial CP data pairs are obtained by parsing a PUSCH signal, and sliding a symbol for each of the plurality of initial CP data pairs to obtain a plurality of corresponding target CP data pairs, performing a correlation summation process for the plurality of initial CP data pairs and the plurality of target CP data pairs to obtain a plurality of second correlation values, and determining a plurality of candidate slot positions according to the reference slot positions by using the slot position of the symbol head corresponding to the second correlation value with the largest value as the reference slot position, thereby implementing a fast symbol head search for the PUSCH signal to determine a plurality of candidate slot positions corresponding to the PUSCH signal, and assisting a subsequent method for determining a more accurate target slot position according to a frequency domain sliding correlation. The first candidate time slot position and the second candidate time slot position after each adjustment form a plurality of candidate time slot positions together, so that when the plurality of candidate time slot positions are determined, the signal characteristics of a new air interface NR are consulted, the convenience of determining the candidate time slot positions can be effectively improved, the timeliness of signal synchronization is ensured to a greater extent, and the signal synchronization effect is ensured.
Fig. 3 is a flowchart of a signal synchronization method according to another embodiment of the disclosure.
As shown in fig. 3, the signal synchronization method includes:
s301: for a plurality of second demodulation reference signals DMRS Rec And respectively performing frequency domain transformation to obtain a plurality of corresponding initial frequency domain signals.
The present embodiment provides for a plurality of second demodulation reference signals DMRS Rec Respectively performing cyclic shift processing of frequency domains to obtain a plurality of corresponding target demodulation reference signals, and performing DMRS (digital Mobile radio) processing on a plurality of first demodulation reference signals Loc And performing conjugate multiplication on the plurality of target demodulation reference signals to obtain a specific implementation mode of a plurality of corresponding first correlation values.
The plurality of second demodulation reference signals DMRS Rec Can be obtained by respectively referring to a plurality of candidate time slot positions, analyzing from the PUSCH signals and demodulating the reference signals DMRS in a plurality of second demodulation reference signals Rec Thereafter, a plurality of second demodulation reference signals DMRS can be processed Rec And respectively performing frequency domain transformation, and taking the frequency domain signals obtained by transformation as initial frequency domain signals.
S302: a plurality of target points are respectively and circularly shifted for each initial frequency domain signal so as to obtain a plurality of target demodulation reference signals corresponding to the initial frequency domain signals.
For example, n points may be cyclically shifted, where n may, for example, take the value of n= -2, -1,0,1,2, and each target point is cyclically shifted for each initial frequency domain signal, and the frequency domain signal obtained by cyclic shift is used as a corresponding target demodulation reference signal.
S303: respectively combining each target demodulation reference signal with a plurality of first demodulation reference signals (DMRS) Loc Conjugate multiplication to obtain a plurality of first demodulation reference signals DMRS Loc And a plurality of reference frequency domain signals respectively corresponding to the plurality of reference frequency domain signals.
The above-mentioned method is to obtain multiple corresponding initial frequency domain signals by respectively and circularly shifting multiple target points for each initial frequency domain signalAfter the target demodulation reference signals, each target demodulation reference signal can be combined with a plurality of first demodulation reference signals (DMRS) Loc The frequency domain signal obtained by conjugate multiplication (i.e., correlation processing) may be referred to as a reference frequency domain signal.
S304: and performing time domain transformation on the plurality of reference frequency domain signals to obtain a plurality of corresponding reference time domain signals.
S305: and respectively analyzing the corresponding multiple correlation values from the multiple reference time domain signals to obtain multiple first correlation values.
The corresponding correlation value is obtained by parsing the reference time domain signal, and may be the maximum correlation value corresponding to the reference time domain signal.
An example of the above steps may be as follows:
multiple second demodulation reference signals (DMRS) Rec Respectively performing frequency domain transformation to obtain multiple corresponding initial frequency domain signals, respectively performing cyclic shift on multiple target points (cyclic shift n points, n can be, for example, n= -2, -1,0,1, 2) for each initial frequency domain signal to obtain multiple target demodulation reference signals (target demodulation reference signals, i.e. demodulation reference signals obtained after cyclic shift of each target point for each initial frequency domain signal), and combining the multiple target demodulation reference signals with 10×2 μ Personal DMRS Loc (i.e., a plurality of first demodulation reference signals DMRS Loc ) Respectively performing conjugate multiplication to obtain a plurality of first demodulation reference signals (DMRS) Loc And a plurality of reference frequency domain signals respectively corresponding to the plurality of reference frequency domain signals.
Then, transforming the multiple reference frequency domain signals to time domain by inverse Fourier transform (Inverse Fast Fourier Transform, IFFT) to obtain multiple corresponding reference time domain signals, then determining the maximum correlation value corresponding to each time slot number L as the first correlation value, and performing cyclic shift and conjugate multiplication to obtain 10×2 μ A first correlation value of from 10 x 2 μ Selected from the first correlation values, when the DMRS Rec First correlation value and time slot number L at cyclic shift n point, P for each k The above steps are repeatedly performed.
For example, each and a plurality of candidate slot positions P are determined k A plurality of second demodulation reference signals DMRS respectively corresponding to the plurality of second demodulation reference signals Rec For corresponding second demodulation reference signal DMRS Rec The steps in the embodiment shown in fig. 3 are repeatedly performed, respectively, to obtain N s *N sym A first correlation value is N s *N sym The largest first correlation value of the first correlation values, at this time, the slot number L and the candidate slot position P corresponding to the largest first correlation value k The target time slot number and the target time slot position of the PUSCH signal are used for realizing auxiliary combination of the target time slot position and the target time slot number to perform signal timing synchronization, and the completeness of the method can be effectively ensured.
In this embodiment, the plurality of second demodulation reference signals DMRS are transmitted by Rec Respectively performing frequency domain transformation to obtain a plurality of corresponding initial frequency domain signals, respectively circularly shifting a plurality of target points for each initial frequency domain signal to obtain a plurality of target demodulation reference signals corresponding to the initial frequency domain signals, and respectively combining each target demodulation reference signal with a plurality of first demodulation reference signals DMRS Loc Conjugate multiplication to obtain a plurality of first demodulation reference signals DMRS Loc The method comprises the steps of respectively corresponding multiple reference frequency domain signals, performing time domain transformation on the multiple reference frequency domain signals to obtain corresponding multiple reference time domain signals, respectively analyzing the multiple reference time domain signals to obtain corresponding multiple correlation values as multiple first correlation values, wherein the multiple first correlation values can be used as references for screening target time slot positions, so that a correlation method based on a frequency domain is supported to rapidly and accurately determine the multiple first correlation values, the influence of a time domain sliding correlation method on time slot timing synchronization of signals is effectively avoided, on the premise of not taking excessive operation resource consumption, cyclic shift processing based on the frequency domain is further carried out, so that the timing synchronization under large frequency offset is more accurate, the time slot timing synchronization efficiency is improved to a greater extent, and the time slot timing synchronization effect is improved.
In the embodiment of the disclosure, the frequency offset can also be detected, and the correction processing of the frequency domain data shift can be performed by referring to the detected fractional frequency offset and the integer frequency offset, see the following embodiment.
Fig. 4 is a flowchart of a signal synchronization method according to another embodiment of the disclosure.
As shown in fig. 4, the signal synchronization method further includes, after the PUSCH signal is acquired:
s401: and determining fractional frequency offset corresponding to the PUSCH signal.
In the embodiment of the disclosure, the fractional frequency offset may be determined with reference to a plurality of initial CP data pairs, where the plurality of initial CP data pairs respectively include a corresponding plurality of first initial CP data and a corresponding plurality of second initial CP data, that is, the plurality of initial CP data pairs are respectively formed by the corresponding plurality of first initial CP data and the corresponding plurality of second initial CP data pairs.
Therefore, when the fractional frequency offset corresponding to the PUSCH signal is determined, the conjugate multiplication can be carried out on the plurality of first initial CP data and the plurality of second initial CP data so as to obtain a plurality of corresponding phase differences; and determining a phase difference average value of the plurality of phase differences, and determining fractional frequency offset according to the phase difference average value to realize quick and accurate determination of fractional frequency offset, wherein the fractional frequency offset can be used for carrying out corresponding correction processing on the PUSCH signal.
Of course, determining the fractional frequency offset corresponding to the PUSCH signal may be implemented in any other possible manner, which is not limited.
Optionally, in some embodiments, the fractional frequency offset is determined according to the average value of the phase difference, which may be that a sampling rate corresponding to the PUSCH signal is obtained, a sampling point number of the fast fourier transform FFT is obtained, and the fractional frequency offset is determined according to the sampling rate, the sampling point number and the average value of the phase difference, so that the fractional frequency offset is calculated quickly and accurately, and the correction accuracy for the PUSCH signal is ensured.
For example, with the characteristic that the initial CP data pair is ideally identical, the first initial CP data and the second initial CP data included in the initial CP data pair may be respectively conjugate-multiplied to obtain a phase difference at each point, and as a plurality of phase differences, a phase difference average value of the plurality of phase differences is determined, and a fractional frequency offset is determined according to the phase difference average value.
Since the initial CP data pair may be affected by the spreading of the last data symbol in the transmission, in practical application, the first symbol may be skipped, while the initial CP data pair estimated to be used may be a CP data pair related to the CP center portion among all the initial CP data pairs.
Assuming that the estimated phase difference average value isFractional frequency offset->Can be obtained from formula (3):
wherein f s For the sampling rate corresponding to the PUSCH signal, finally, implementing frequency offset correction on the PUSCH signal r (n) by adopting the formula (4):
the reference CP data pair carries out frequency offset estimation, and the frequency offset range obtained by estimation is
S402: and carrying out frequency offset correction processing on the PUSCH signal based on the fractional frequency offset so as to obtain a target PUSCH signal.
For example, the frequency offset correction may be performed on the PUSCH signal r (n) by using the above formula (4).
The step of performing symbol head search on the PUSCH signal to obtain a plurality of candidate slot positions corresponding to the PUSCH signal may specifically be performing symbol head search on the target PUSCH signal to obtain a plurality of candidate slot positions corresponding to the target PUSCH signal, where the target PUSCH signal is obtained based on fractional frequency offset correction, so that fractional frequency domain data shift of the PUSCH signal can be corrected in time, and slot timing synchronization accuracy of the PUSCH signal can be improved in a relatively large degree in an auxiliary manner.
S403: a cyclic shift position corresponding to the target slot number is determined.
In this embodiment, after determining the fractional frequency offset corresponding to the PUSCH signal, in order to further ensure the accuracy of frequency offset determination, if the frequency offset exceeds the data of one subcarrier, an integer frequency offset may be further determined, where the integer frequency offset is used to perform signal compensation on the target PUSCH signal.
S404: the spacing frequency between two adjacent subcarriers is determined.
S405: and taking the product value of the cyclic shift position and the interval frequency as an integer frequency offset, wherein the integer frequency offset is used for carrying out signal compensation on the target PUSCH signal.
Optionally, signal compensation can be performed on the target PUSCH signal according to the integer frequency offset and the sampling rate, so that fractional frequency offset recovery compensation is performed on the PUSCH signal, integer frequency offset recovery compensation is performed on the PUSCH signal, and the compensation effect of the PUSCH signal is effectively improved.
When determining the integer frequency offset, the target time slot number and the target time slot position obtained after the cyclic shift processing of the frequency domain can be referred to, the cyclic shift position corresponding to the target time slot number can be determined, the interval frequency between two adjacent subcarriers is determined, the product value of the cyclic shift position and the interval frequency is taken as the integer frequency offset, so that the integer frequency offset can be accurately determined, and the signal compensation is performed on the target PUSCH signal by referring to the integer frequency offset and the sampling rate, thereby further ensuring the accuracy of the frequency offset determination.
As shown in fig. 5, fig. 5 is a schematic flow chart of a signal synchronization method in an embodiment of the disclosure, and in conjunction with the descriptions of the embodiments shown in fig. 1-4 above, the embodiment of the disclosure mainly involves three steps: symbol head search may initially determine N sym A number of possible candidate slot positions; fractional frequency offset recovery estimates fractional frequency offset, compensates all processed data, and determines candidate slot positions through DMRS Rec With cyclically shifted DMRS Loc Cross-correlation is achieved.
In this embodiment, when determining the fractional frequency offset corresponding to the PUSCH signal, the conjugate multiplication may be performed on the plurality of first initial CP data and the plurality of second initial CP data, so as to obtain a plurality of corresponding phase differences; and determining a phase difference average value of the plurality of phase differences, and determining fractional frequency offset according to the phase difference average value to realize quick and accurate determination of fractional frequency offset, wherein the fractional frequency offset can be used for carrying out corresponding correction processing on the PUSCH signal. And performing symbol head search on the target PUSCH signal to obtain a plurality of candidate time slot positions corresponding to the target PUSCH signal, wherein the target PUSCH signal is obtained based on fractional frequency offset correction, so that fractional frequency domain data shift of the PUSCH signal can be corrected in time, and the time slot timing synchronization accuracy of the PUSCH signal can be improved in a relatively large degree in an auxiliary manner. After determining the fractional frequency offset corresponding to the PUSCH signal, if the frequency offset exceeds the data of one subcarrier, an integer frequency offset (the integer frequency offset may be the frequency offset of the summary of the plurality of first initial CP data and the plurality of second initial CP data) may be further determined, where the integer frequency offset is used to perform signal compensation on the target PUSCH signal. And carrying out signal compensation on the target PUSCH signal according to the integer frequency offset and the sampling rate, so that not only the fractional frequency offset recovery compensation on the PUSCH signal is realized, but also the integer frequency offset recovery compensation on the PUSCH signal is realized, and the compensation effect of the PUSCH signal is effectively improved.
The method and the device can realize the timing synchronization of the PUSCH signal time slot of the non-signaling terminal comprehensive tester of the new air interface NR, and solve the technical problem of inaccurate signal timing synchronization when the scheduling data is 1RB in the related technology. Meanwhile, the technical problem of inaccurate timing synchronization of signals caused by the disappearance of correlation peaks due to the shift of frequency domain data under large frequency offset can be solved. By optimizing the related scheme, the calculated amount is reduced, and the time slot synchronization of the PUSCH signal of the non-signaling terminal comprehensive tester of the new air interface NR is realized.
Based on the signal synchronization method described in the above embodiments, the embodiments of the present disclosure further provide a detailed signal slot synchronization process of a PUSCH signal of a CP-OFDM waveform, where a parameter used in the simulation is one of frame structure models specified in a new air interface NR protocol. The details are shown in table 1 below (simulation parameter table):
TABLE 1
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Wherein, bandwidth (bandwidth, BW), time-frequency resource distribution (Physical Resource Block, PRB).
Because the data of the tail part of the OFDM signal is the same as the CP data of the head part of the signal, N can be preliminarily obtained by adopting a cyclic prefix CP sliding correlation mode sym Coarse synchronization position P k 。
The present disclosure employs the characteristic that the length of the other symbols is the same except the length of the first symbol in one slot, and the first symbol head P is determined by sliding in the CP 1 Sequentially increment N CP +N FFT =4384, the remaining 13 symbol heads are obtained. As shown in fig. 6, fig. 6 is a schematic diagram of correlation results of sliding different window lengths in the embodiment of the disclosure, where the positions of 14 peaks included in the curve may be symbol positions obtained by sliding the window 61440 point correlation, and the dashed line is a position obtained by sliding a window length 4384 point to obtain the first symbol header P 1 The solid line is the process of obtaining P 1 Then P is obtained by sequentially increasing 4384 points 2 ～P 14 As a result of (a). As can be seen by comparison, the difference between the time slot head obtained by the sequential incremental calculation and the symbol head obtained by the sliding 61440 point is not great, and the window length W is carried out subsequently f Sliding of =200, further, P can be adjusted k Is of the order of (2)The method is set so that the symbol head obtained by the method is basically not different from the symbol head obtained by sliding 61440 points, but the calculated amount is reduced by one order of magnitude from 61440 times of correlation to 4384+14 times of 200=7184 times.
In practical application, the received PUSCH signal is affected by frequency offset during transmission, so as to affect the demodulation reference signal DMRS carried by the PUSCH signal Rec DMRS with local demodulation reference signal Loc As a result of the correlation, synchronization failure occurs, so that frequency offset recovery can be performed on the received PUSCH signal before Step3 shown in fig. 5 is performed. Let P be 1 And obtaining initial Cyclic Prefix (CP) data pairs of 14 symbols at the moment for the real time slot head, performing conjugate multiplication on data of the CP data pairs to obtain phase difference of each point, and converting the average value of the phase difference into frequency offset.
Because the CP data pair is affected by the waveform expansion of the last data symbol in actual transmission, during calculation, the CP data pair of the first symbol can be removed, meanwhile, 80 points before and after the CP data are removed, central data are reserved, and frequency offset estimation is performed at the total (288-80 x 2) x 13=1664 points.
In the signal timing synchronization, one symbol header P is provided from among 14 symbol headers obtained in Step1 in fig. 5 according to the frame structure of the new air interface NR signal k Is the target slot position. Since the location of the symbol corresponding to the DMRS is known in the slot, it is assumed that each P k All possible target time slot positions, and take out a corresponding DMRS Rec It is transformed into the frequency domain.
DMRS is used to determine the frequency offset of the carrier due to the presence of a large frequency offset Rec Cyclically shifting n points (n= -2, -1,0,1, 2) by 10 x 2 = 20 DMRS Loc The result of conjugate multiplication is transformed to time domain by inverse Fourier IFFT, and the maximum value, the corresponding DMRS number is recorded as the time slot number L and the position of the number of the circulating points. After 14 cyclic correlations, there are 5×14=60 correlations. Selecting the maximum correlation value corresponding to P k I.e. the actual time slot position (i.e. the target time slot position), the corresponding L is the time slot number thereof, and the corresponding n=1, which is an integer multipleThe frequency offset is-30 KHz. When the time slot head is P k In this case, the maximum correlation results are shown in fig. 7, and fig. 7 is a schematic diagram of the position of the symbol maximum correlation value in the embodiment of the disclosure.
It can be seen that, for the PUSCH signal received this time, the position P corresponding to the symbol 13 13 I.e. the real slot head (the slot position of the real slot head, i.e. the target slot position). The correlation result corresponding to the symbol has obvious difference from the correlation results of other symbols, and is easy to distinguish. At this time, demodulation reference signal DMRS is received Rec DMRS with local demodulation reference signal Loc As shown in fig. 8, fig. 8 is a demodulation reference signal DMRS received in an embodiment of the present disclosure Rec DMRS with local demodulation reference signal Loc Is a graph of correlation values.
It can be seen that the received demodulation reference signal DMRS Rec DMRS with local demodulation reference signal Loc There are two obvious peaks in the correlation value of (a) and when the time domain synchronization position of the received PUSCH signal is accurate, the demodulation reference signal DMRS of the received PUSCH signal Rec DMRS with local demodulation reference signal Loc The correlation obtained maximum is at the center position (2048). And the reason for the two peaks is: DMRS due to local demodulation reference signal Loc Is comb-shaped in the frequency domain. For complex numbers, correlation in the time domain corresponds to conjugate multiplication in the frequency domain. Local demodulation reference signal DMRS Loc With received demodulation reference signal DMRS Rec The result of the multiplication in the frequency domain is also comb-shaped. The FFT features that the result of comb conjugate multiplication is converted to time domain by IFFT, and the time domain data is symmetrical back and forth, and the absolute value is taken to be equal.
Fig. 9 is a schematic structural diagram of a signal synchronization device according to an embodiment of the disclosure.
As shown in fig. 9, the signal synchronization device 90 includes:
an acquisition unit 901, configured to acquire a physical uplink shared channel PUSCH signal and a local plurality of first demodulation reference signals DMRS Loc ；
A search unit 902, configured to perform symbol head search on a PUSCH signal to obtain a plurality of candidate slot positions corresponding to the PUSCH signal;
an analyzing unit 903 for analyzing and obtaining a plurality of second demodulation reference signals DMRS corresponding to the plurality of candidate slot positions from the PUSCH signal Rec ；
A first processing unit 904 configured to perform a plurality of second demodulation reference signals DMRS Rec Respectively performing cyclic shift processing of the frequency domains to obtain a plurality of corresponding target demodulation reference signals;
a second processing unit 905 for performing demodulation on the plurality of first demodulation reference signals DMRS Loc Performing conjugate multiplication on the target demodulation reference signals to obtain a plurality of corresponding first correlation values; and
a determining unit 906, configured to determine a target slot position from among a plurality of candidate slot positions according to the plurality of first correlation values, where the target slot position is used for signal synchronization on the PUSCH signal.
It should be noted that, the above device provided in the embodiment of the present disclosure can implement all the method steps implemented in the method embodiment and achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those in the method embodiment in this embodiment are omitted.
In this embodiment, the PUSCH signal and the local DMRS are obtained Loc Performing symbol head search on the PUSCH signal to obtain a plurality of candidate time slot positions corresponding to the PUSCH signal, and analyzing the PUSCH signal to obtain a plurality of second demodulation reference signals (DMRS) corresponding to the candidate time slot positions Rec For a plurality of second demodulation reference signals DMRS Rec Respectively performing cyclic shift processing of frequency domains to obtain multiple corresponding target demodulation reference signals, and performing DMRS (digital Mobile radio standard) on multiple first demodulation reference signals Loc Conjugate multiplying the plurality of target demodulation reference signals to obtain a plurality of corresponding first correlation values, and determining a target time slot position from a plurality of candidate time slot positions according to the plurality of first correlation values, wherein the target time slot position is used for signal synchronization of the PUSCH signals and can be based onThe cyclic shift processing of the frequency domain assists in carrying out time slot timing synchronization of signals, so that timing synchronization under large frequency deviation is more accurate, the accuracy of time slot synchronization of the PUSCH signals of the comprehensive tester of the terminal is effectively improved, and the time slot synchronization effect of the PUSCH signals is effectively improved.
Fig. 10 is a schematic structural diagram of a signal synchronization device according to another embodiment of the present disclosure.
Referring to fig. 10, the signal synchronization device 100 includes a memory 1001, a transceiver 1002, and a processor 1003: a memory 1001 for storing a computer program; a transceiver 1002 for transceiving data under the control of the processor 1003; a processor 1003 for reading the computer program in the memory 1001 and performing the following operations:
acquiring Physical Uplink Shared Channel (PUSCH) signals and local multiple first demodulation reference signals (DMRS) Loc ；
Carrying out symbol head searching on the PUSCH signal to obtain a plurality of candidate time slot positions corresponding to the PUSCH signal;
Analyzing and obtaining a plurality of second demodulation reference signals (DMRS) corresponding to a plurality of candidate slot positions from the PUSCH signals Rec ；
For a plurality of second demodulation reference signals DMRS Rec Respectively performing cyclic shift processing of the frequency domains to obtain a plurality of corresponding target demodulation reference signals;
for a plurality of first demodulation reference signals DMRS Loc Performing conjugate multiplication on the target demodulation reference signals to obtain a plurality of corresponding first correlation values; and
and determining a target time slot position from the plurality of candidate time slot positions according to the plurality of first correlation values, wherein the target time slot position is used for signal synchronization of the PUSCH signal.
Wherein the transceiver 1002 is configured to receive and transmit data under the control of the processor 1003.
Where in FIG. 10, a bus architecture may be comprised of any number of interconnected buses and bridges, one or more processors, represented in particular by processor 1003, and various circuits of the memory, represented by memory 1001.
The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein.
The bus interface provides an interface. The transceiver 1002 may be a number of elements, i.e., including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium, including wireless channels, wired channels, optical cables, etc. The processor 1003 is responsible for managing the bus architecture and general processing, and the memory 1001 may store data used by the processor 1003 in performing operations.
The processor 1003 may be a Central Processing Unit (CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a Field programmable gate array (Field-Programmable Gate Array, FPGA), or a complex programmable logic device (Complex Programmable Logic Device, CPLD), and the processor 1003 may also employ a multi-core architecture.
It should be noted that, the above device provided in the embodiment of the present disclosure can implement all the method steps implemented in the method embodiment and achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those in the method embodiment in this embodiment are omitted.
In this embodiment, the PUSCH signal and the local DMRS are obtained Loc Performing symbol head search on the PUSCH signal to obtain a plurality of candidate time slot positions corresponding to the PUSCH signal, and analyzing the PUSCH signal to obtain a plurality of second demodulation reference signals (DMRS) corresponding to the candidate time slot positions Rec For a plurality of second demodulation reference signals DMRS Rec Respectively performing cyclic shift processing of frequency domains to obtain multiple corresponding target demodulation reference signals, and performing DMRS (digital Mobile radio standard) on multiple first demodulation reference signals Loc Conjugate multiplying the target demodulation reference signals to obtain corresponding first correlation values, and determining from among candidate slot positions according to the first correlation valuesAnd determining a target time slot position, wherein the target time slot position is used for carrying out signal synchronization on the PUSCH signal, and the time slot timing synchronization of the signal can be assisted based on the cyclic shift processing of the frequency domain, so that the timing synchronization under the large frequency deviation is more accurate, the accuracy of the time slot synchronization of the PUSCH signal of the terminal comprehensive tester is effectively improved, and the time slot synchronization effect of the PUSCH signal is effectively improved.
To achieve the above embodiments, the disclosed embodiments provide a processor-readable storage medium storing a computer program for causing a processor to execute a signal synchronization method.
It should be noted that in the description of the present disclosure, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present disclosure in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present disclosure.
It should be understood that portions of the present disclosure may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
Furthermore, each functional unit in the embodiments of the present disclosure may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present disclosure have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the present disclosure, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the present disclosure.

Claims (14)

1. A method of signal synchronization, the method comprising:
acquiring Physical Uplink Shared Channel (PUSCH) signals and local multiple first demodulation reference signals (DMRS) Loc ；
Performing symbol head searching on the PUSCH signal to obtain a plurality of candidate time slot positions corresponding to the PUSCH signal;
analyzing and obtaining a plurality of second demodulation reference signals (DMRS) corresponding to the plurality of candidate slot positions from the PUSCH signals Rec ；
For the plurality of second demodulation reference signals DMRS Rec Respectively performing cyclic shift processing of the frequency domains to obtain a plurality of corresponding target demodulation reference signals;
for the plurality of first demodulation reference signals DMRS Loc Performing conjugate multiplication on the target demodulation reference signals to obtain a plurality of corresponding first correlation values; and
and determining a target time slot position from the candidate time slot positions according to the first correlation values, wherein the target time slot position is used for signal synchronization of the PUSCH signal.
2. The method of claim 1, wherein the performing a symbol header search on the PUSCH signal to obtain a plurality of candidate slot positions corresponding to the PUSCH signal comprises:
analyzing the PUSCH signals to obtain a plurality of initial Cyclic Prefix (CP) data pairs;
sliding a symbol on each of the plurality of initial CP data pairs to obtain a plurality of corresponding target CP data pairs;
performing correlation summation processing on the plurality of initial CP data pairs and the plurality of target CP data pairs to obtain a plurality of second correlation values; and
and taking the time slot position of the symbol head corresponding to the second correlation value of the maximum value in the plurality of second correlation values as a reference time slot position, and determining the plurality of candidate time slot positions according to the reference time slot position.
3. The method of claim 2, wherein the parsing the PUSCH signal to obtain a plurality of initial cyclic prefix CP data pairs comprises:
determining the position of a time slot head in the PUSCH signal;
and sequentially analyzing a plurality of CP data pairs from the PUSCH signal by taking the slot head position as a reference position as the plurality of initial CP data pairs.
4. The method of claim 3, wherein the reference slot position is a slot position corresponding to a first symbol head in the PUSCH signal, the determining the plurality of candidate slot positions based on the reference slot position comprising:
updating the reference time slot position according to the time slot head position to obtain a first candidate time slot position;
determining a target value, wherein the target value is the sum of the length of the initial CP data pair and the sampling point number of the FFT;
and adjusting the first candidate time slot position at least once according to the target value to obtain second candidate time slot positions after each adjustment, wherein the first candidate time slot positions and the second candidate time slot positions after each adjustment jointly form the plurality of candidate time slot positions.
5. The method of claim 2, wherein the pair of the plurality of second demodulation reference signals, DMRS Rec Performing cyclic shift processing of the frequency domain to obtain a plurality of corresponding target demodulation reference signals, including:
for the plurality of second demodulation reference signals DMRS Rec Respectively carrying out frequency domain transformation to obtain a plurality of corresponding initial frequency domain signals;
Circularly shifting a plurality of target points for each initial frequency domain signal respectively to obtain a plurality of target demodulation reference signals corresponding to the initial frequency domain signals;
said demodulating said plurality of first demodulatorsReference signal DMRS Loc Performing conjugate multiplication on the plurality of target demodulation reference signals to obtain a plurality of corresponding first correlation values, including:
respectively combining each of the target demodulation reference signal and the plurality of first demodulation reference signals DMRS Loc Conjugate multiplication to obtain a plurality of first demodulation reference signals DMRS Loc A plurality of reference frequency domain signals respectively corresponding to the plurality of reference frequency domain signals;
performing time domain transformation on the plurality of reference frequency domain signals to obtain a plurality of corresponding reference time domain signals;
and respectively analyzing and obtaining a plurality of corresponding correlation values from the plurality of reference time domain signals to serve as the plurality of first correlation values.
6. The method of claim 5, further comprising, after the acquiring the physical uplink shared channel PUSCH signal:
determining fractional frequency offset corresponding to the PUSCH signal;
performing frequency offset correction processing on the PUSCH signal based on the fractional frequency offset to obtain a target PUSCH signal;
the performing symbol head search on the PUSCH signal to obtain a plurality of candidate slot positions corresponding to the PUSCH signal, including:
And searching the symbol head of the target PUSCH signal to obtain a plurality of candidate time slot positions corresponding to the target PUSCH signal.
7. The method of claim 6, wherein the plurality of initial CP data includes a corresponding plurality of first initial CP data and a corresponding plurality of second initial CP data, respectively, the determining a fractional frequency offset corresponding to the PUSCH signal comprising:
performing conjugate multiplication on the plurality of first initial CP data and the plurality of second initial CP data to obtain a plurality of corresponding phase differences;
and determining a phase difference average value of the plurality of phase differences, and determining the fractional frequency offset according to the phase difference average value.
8. The method of claim 7, wherein said determining said fractional frequency offset from said phase difference average value comprises:
acquiring a sampling rate corresponding to the PUSCH signal;
obtaining the sampling point number of the fast Fourier transform FFT;
and determining the fractional frequency offset according to the sampling rate, the sampling point number and the phase difference average value.
9. The method of claim 8, wherein said determining a target slot position from among said plurality of candidate slot positions based on said plurality of first correlation values comprises:
Taking a candidate time slot position corresponding to the first correlation value with the largest value as the target time slot position;
after the determining the target slot position from the plurality of candidate slot positions, further comprising:
and determining a target time slot number corresponding to the target time slot position, wherein the target time slot position and the target time slot number are commonly used for signal synchronization of the PUSCH signal.
10. The method of claim 9, further comprising, after the determining the fractional frequency offset corresponding to the PUSCH signal:
determining a cyclic shift position corresponding to the target time slot number;
determining an interval frequency between two adjacent subcarriers;
and taking the product value of the cyclic shift position and the interval frequency as an integer frequency offset, wherein the integer frequency offset is used for carrying out signal compensation on the target PUSCH signal.
11. The method as recited in claim 10, further comprising:
and carrying out signal compensation on the target PUSCH signal according to the integer frequency deviation and the sampling rate.
12. A signal synchronization device, the device comprising:
an acquisition unit, configured to acquire a physical uplink shared channel PUSCH signal and a local plurality of first demodulation reference signals DMRS Loc ；
A searching unit, configured to perform symbol head searching on the PUSCH signal to obtain a plurality of candidate slot positions corresponding to the PUSCH signal;
an parsing unit, configured to parse the PUSCH signal to obtain a plurality of second demodulation reference signals DMRS corresponding to the plurality of candidate slot positions, respectively Rec ；
A first processing unit for performing demodulation of the plurality of second demodulation reference signals (DMRS) Rec Respectively performing cyclic shift processing of the frequency domains to obtain a plurality of corresponding target demodulation reference signals;
a second processing unit for performing demodulation on the plurality of first demodulation reference signals (DMRS) Loc Performing conjugate multiplication on the target demodulation reference signals to obtain a plurality of corresponding first correlation values; and
and the determining unit is used for determining a target time slot position from the candidate time slot positions according to the first correlation values, wherein the target time slot position is used for signal synchronization of the PUSCH signal.
13. A signal synchronization device, comprising a memory, a transceiver, and a processor: a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:
Acquiring Physical Uplink Shared Channel (PUSCH) signals and local multiple first demodulation reference signals (DMRS) Loc ；
Performing symbol head searching on the PUSCH signal to obtain a plurality of candidate time slot positions corresponding to the PUSCH signal;
analyzing and obtaining a plurality of second demodulation reference signals (DMRS) corresponding to the plurality of candidate slot positions from the PUSCH signals Rec ；
For the plurality of second demodulation reference signals DMRS Rec Respectively performing cyclic shift processing of the frequency domains to obtain a plurality of corresponding target demodulation reference signals;
for the plurality of first demodulation reference signals DMRS Loc Performing conjugate multiplication on the target demodulation reference signals to obtain a plurality of corresponding first correlation values; and
and determining a target time slot position from the candidate time slot positions according to the first correlation values, wherein the target time slot position is used for signal synchronization of the PUSCH signal.
14. A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program for causing the processor to perform the method of any one of claims 1 to 11.
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