CN112671431B - Synchronization method, device, device and medium based on partial spread spectrum synchronization sequence - Google Patents

Abstract

The invention discloses a synchronization method based on a partial spread spectrum synchronization sequence, comprising: acquiring a received signal, the synchronization sequence of the received signal is a partial spread spectrum synchronization sequence; The correlation determination rule determines the corresponding delay autocorrelation function; wherein, the delay autocorrelation determination rule is determined through an iterative calculation method; the time-frequency synchronization is performed by using the delay autocorrelation function. It can be seen that in this scheme, when using the repeated structure in the partial spread spectrum synchronization sequence to perform time-frequency synchronization, the delay autocorrelation function of the received signal can be determined by the delay autocorrelation determination rule with iterative calculation method, and the delay autocorrelation function can be determined by the delay autocorrelation function. The time-frequency synchronization is performed using the time-autocorrelation function, thereby reducing the hardware resources required for calculation on the basis of improving the synchronization performance. The invention also discloses a synchronization device, equipment and medium based on a partial spread spectrum synchronization sequence, which can also achieve the above technical effects.

Description

Synchronization method, device, device and medium based on partial spread spectrum synchronization sequence

technical field

The present invention relates to the technical field of mobile communication systems, and more particularly, to a synchronization method, apparatus, device and medium based on a partial spread spectrum synchronization sequence.

Background technique

Time-frequency synchronization is one of the core components of receiver design and is the basis for normal communication of transceivers. OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing)/SCFDE (Single Carrier-Frequency Domain Equalization, Single Carrier Frequency Domain Equalization) systems are two typical systems of broadband wireless communication systems, and the time-frequency synchronization method is based on The S&C method is the most typical. Its basic idea is to send a synchronization sequence with a repetitive structure at the transmitting end. The receiving end calculates the delay correlation function of the received signal and finds the extreme point of the delay correlation function to achieve symbol timing synchronization. The phase information of the extreme point realizes the frequency offset estimation. Although many subsequent scholars have proposed a series of new synchronization methods, their core has not departed from the theoretical framework of the S&C method.

Partial spread spectrum synchronization sequence is a highly reliable time-frequency synchronization method. Its basic idea is to perform spread spectrum processing on a part of the classical synchronization sequence, and the receiver first performs corresponding despread processing and then performs delay correlation operation. The position and phase of the extreme point of the delay correlation function realize time-frequency synchronization. The experimental results show that due to the full use of the extra gain from the spread band, the low signal-to-noise ratio and electromagnetic interference can be significantly improved without increasing the bandwidth. Synchronization performance in such complex environments. Among them, the implementation complexity is another important index to measure the performance of the synchronization method, and it is an important factor restricting the design of equipment miniaturization/low power consumption and low cost. For example: Multiple-input multiple-output technology is an important means that can significantly improve the transmission capacity or reliable transmission capability of communication systems. It has been widely used in civil cellular or ad hoc network communication terminals and systems. However, it improves communication performance while achieving The complexity also increases in a linear fashion, so to achieve a miniaturized/low-power design for MIMO devices, low-complexity implementations of communication components such as time-frequency synchronization need to be studied.

Therefore, it is a problem to be solved by those skilled in the art how to reduce the required computing resources on the basis of making full use of the repetitive structure in part of the spread spectrum synchronization sequence to perform time-frequency synchronization.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a synchronization method, device, equipment and medium based on a partial spread spectrum synchronization sequence, so as to reduce the required calculation on the basis of making full use of the repetitive structure in the partial spread spectrum synchronization sequence for time-frequency synchronization resource.

In order to achieve the above purpose, a synchronization method based on a partial spread spectrum synchronization sequence provided by the present invention includes:

acquiring a received signal, the synchronization sequence of the received signal is a partial spread spectrum synchronization sequence;

Determine the delay autocorrelation function corresponding to the received signal according to the received signal, the spreading sequence, the spreading factor and the delay autocorrelation determination rule; wherein the delay autocorrelation determination rule is an iterative calculation method definite;

Time-frequency synchronization is performed using the delayed autocorrelation function.

Wherein, the spreading sequence S[k] is an m sequence or a Golden sequence.

Wherein, determining the delay autocorrelation function corresponding to the received signal according to the received signal, the spreading sequence, the spreading factor and the preset delay autocorrelation determination rule, including:

Determine the received signal r(n), the spreading sequence S[k] and the spreading factor K, and determine the delay autocorrelation function based on the delay autocorrelation determination rule; the length of the spreading sequence is N, N=PK, and P is number of segments;

Among them, the delay autocorrelation determination rule is:

R(n)=R ₀ (n)+...+R _P-1 (n);

Among them, R(n) is the delay autocorrelation function at the nth time, and R(n) is the sum of the P segment delay autocorrelation functions, and the determination rule of the pth segment delay autocorrelation function is:

where r ^* (n) is the conjugate signal of r(n).

In order to achieve the above object, the present invention further provides a synchronization device based on a partial spread spectrum synchronization sequence, comprising:

a signal receiving module, configured to acquire a received signal, the synchronization sequence of the received signal is a partial spread spectrum synchronization sequence;

A determination module, configured to determine the delay autocorrelation function corresponding to the received signal according to the received signal, the spreading sequence, the spreading factor and the delay autocorrelation determination rule; wherein, the delay autocorrelation determination rule is determined by iterative calculation;

A synchronization module, configured to perform time-frequency synchronization by using the delay autocorrelation function.

Wherein, the spreading sequence S[k] is an m sequence or a Golden sequence.

The determining module is specifically used to: determine the received signal r(n), the spreading sequence S[k] and the spreading factor K, and determine the delay autocorrelation function based on the delay autocorrelation determination rule; The length is N, N=PK, and P is the number of segments;

Among them, the delay autocorrelation determination rule is:

R(n)=R ₀ (n)+...+R _P-1 (n);

Among them, R(n) is the delay autocorrelation function at the nth time, and R(n) is the sum of the P segment delay autocorrelation functions, and the determination rule of the pth segment delay autocorrelation function is:

where r ^* (n) is the conjugate signal of r(n).

To achieve the above object, the present invention further provides an electronic device, comprising:

memory for storing computer programs;

The processor is configured to implement the steps of the above-mentioned synchronization method based on a partial spread spectrum synchronization sequence when executing the computer program.

In order to achieve the above object, the present invention further provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by the processor, the above-mentioned synchronization based on the partial spread spectrum synchronization sequence is realized. steps of the method.

It can be seen from the above solutions that a synchronization method based on a partial spread spectrum synchronization sequence provided by an embodiment of the present invention includes: acquiring a received signal, where the synchronization sequence of the received signal is a partial spread spectrum synchronization sequence; frequency sequence, spreading factor and delay autocorrelation determination rule, and determine the delay autocorrelation function corresponding to the received signal; wherein, the delay autocorrelation determination rule is determined by iterative calculation; using the delay autocorrelation function The time-frequency synchronization is performed by the time autocorrelation function.

It can be seen that in this scheme, when using the repetitive structure in the partial spread spectrum synchronization sequence to perform time-frequency synchronization, the delay autocorrelation function of the received signal can be determined by the delay autocorrelation determination rule with iterative calculation method, and the delay autocorrelation function can be determined by the delay autocorrelation function. The time-frequency synchronization is performed using the time-autocorrelation function, thereby reducing the hardware resources required for calculation on the basis of improving the synchronization performance. The invention also discloses a synchronization device, equipment and medium based on a partial spread spectrum synchronization sequence, which can also achieve the above technical effects.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic diagram of a delay correlation synchronization algorithm of a repetitive structure synchronization sequence disclosed in an embodiment of the present invention;

FIG. 2 is a structural diagram of the same division spread spectrum synchronization sequence disclosed in an embodiment of the present invention;

3 is a schematic flowchart of a synchronization method based on a partial spread spectrum synchronization sequence disclosed in an embodiment of the present invention;

4 is a schematic diagram of a low-complexity delay correlation calculation architecture of a partial spread spectrum synchronization sequence disclosed in an embodiment of the present invention;

5 is a schematic structural diagram of a synchronization apparatus based on a partial spread spectrum synchronization sequence disclosed in an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an electronic device disclosed in an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

First of all, it should be noted that in the classic S&C delay correlation synchronization algorithm, the synchronization symbol is composed of several parts that are completely equal in the time domain. Referring to FIG. 1 , it is a schematic diagram of the delay correlation synchronization algorithm of the repetitive structure synchronization sequence disclosed in the embodiment of the present invention. , according to the repetitive structure of the synchronization sequence, use the delay correlation operation to construct a metric function to obtain timing and frequency offset estimates, and the metric function can be expressed as:

in,

In the above formula, N represents the length of the OFDM symbol or the SCFDE symbol. At this point, the symbol timing estimate is:

Among them, d represents the serial number of the first sampling point of the sliding correlation window, and P(d) is the result of the delay correlation operation on the received signal. Due to the repetitive nature of the synchronization sequence, the delay correlation value will peak at the position of the synchronization sequence, Timing estimation is achieved by searching for the largest peak of the metric function. The frequency offset estimate is obtained by delaying the phase of the correlation value at the timing point:

分别表示子载波归一化频偏机器估计值。在实现过程中，式(2)可以变换为式(6)所示的迭代计算模式：where ε and

respectively represent the sub-carrier normalized frequency offset machine estimated value. In the implementation process, equation (2) can be transformed into the iterative calculation mode shown in equation (6):

P(d+1)=P(d)+r ^* (d+k)r(d+kN)-r ^* (d+kN)r(d+k-2N) (6)

It can be seen that, using the delay correlation calculation method shown in equation (6), the delay correlation can be realized by only one complex multiplier and two complex adders. Compared with equation (2), its computational complexity is significant. decline.

In order to improve the performance of the S&C synchronization method, a time-frequency synchronization method based on a partial spread spectrum synchronization sequence is proposed. Referring to FIG. 2 , it is a structural diagram of a partial spread spectrum synchronization sequence. Referring to Figure 2, it is assumed that the synchronization sequence consists of two sequences A and S(A), where the S(A) sequence is obtained by multiplying the sequence A and the corresponding spreading sequence S[k], namely:

S(A)[k]=A[k]*S[k] (7)

Among them, the spreading sequence S[k] is the m sequence or the Golden sequence, the duration of each element is T, T=KT _s , T _s is the sampling period of the synchronization sequence, K is the partial spreading factor, according to the bandwidth and The length of the repeating structure synchronization sequence is determined. Generally, K is a positive integer greater than 1.

Correspondingly, the delay autocorrelation function of the partial spread spectrum synchronization sequence can be calculated according to equation (8):

Due to the introduction of the spread spectrum sequence, the amplitude of the autocorrelation function of the received signal delay will have a sharp correlation peak, and the symbol timing synchronization can be realized by accurately detecting the position where the peak appears, and the symbol timing synchronization has high stability and accuracy. . On the other hand, without considering the influence of noise, the phase of its peak value and the normalized frequency offset ε satisfy the relationship shown in equation (9):

表示延时自相关曲线的峰值，根据式(9)，可以得到归一化频偏ε的估计值

为ε：in,

Represents the peak value of the delay autocorrelation curve. According to equation (9), the estimated value of the normalized frequency offset ε can be obtained

for ε:

As shown in Equation (8), due to the need for additional despreading operations, the computational complexity of the delay correlation function is very high. Therefore, it is necessary to reduce the computational complexity of the algorithm to enhance the practicability of the algorithm.

Considering that S[k] is an m sequence or a Golden sequence, and its value is -1 or +1, therefore, the delay correlation calculation shown in Equation (8) can be expressed as

Among them, N represents the length of the special repeat structure sequence. Note that the delay autocorrelation calculation of the partial spread spectrum synchronization sequence described in equation (11) mainly involves two processes of delay autocorrelation calculation and despreading. Since the multiplication operation satisfies the commutative law and the associative law, the delay autocorrelation calculation of part of the spread spectrum synchronization sequence can first perform the delay correlation operation, and then perform the despread operation on the multiplication of the delay correlation result and the spread spectrum sequence. The sum and accumulation of N sequences obtained by multiplying the result of delay correlation with the spread spectrum sequence, therefore, requires 1 complex multiplier and N complex adders to realize, and the hardware resource overhead occupied by the required adder is very high. big.

Therefore, in this application, combined with the characteristics of the spread spectrum sequence S[k], a synchronization method, device, equipment and medium based on the partial spread spectrum synchronization sequence are proposed to make full use of the repetitive structure in the partial spread spectrum synchronization sequence. On the basis of time-frequency synchronization, the computational complexity is reduced and the required computational resources are reduced.

Referring to FIG. 3, a synchronization method based on a partial spread spectrum synchronization sequence provided by an embodiment of the present invention includes:

S101. Acquire a received signal, where the synchronization sequence of the received signal is a partial spread spectrum synchronization sequence;

It should be noted that when the transmitting end sends a signal, the synchronization sequence is added before the data frame to be sent. In this embodiment, the synchronization sequence is a partial spread spectrum synchronization sequence. As shown in FIG. 2 , the partial spread spectrum The frequency synchronization sequence has two parts: sequence A and S(A). After the receiving end receives the signal, it can locate the data frame by detecting the existence of the synchronization sequence in the received signal, that is, by calculating the delay autocorrelation function that matches the repeated structure of the synchronization sequence, and detecting the delay autocorrelation function The symbol timing synchronization is realized by the peak value of , and further, the carrier frequency offset estimation is realized by delaying the phase of the autocorrelation function.

S102, determining the delay autocorrelation function corresponding to the received signal according to the received signal, the spreading sequence, the spreading factor and the delay autocorrelation determination rule; wherein, the delay autocorrelation determination rule is determined by an iterative calculation method;

In this embodiment, according to the received signal, the spreading sequence, the spreading factor and the preset delay autocorrelation determination rule, the process of determining the delay autocorrelation function corresponding to the received signal includes: determining the received signal r(n ), the spread spectrum sequence S[k] and the spread spectrum factor K, and determine the delay autocorrelation function based on the delay autocorrelation determination rule; the length of the spread spectrum sequence is N, N=PK, and P is the number of segments;

Among them, the delay autocorrelation determination rule is:

R(n)=R ₀ (n)+...+R _P-1 (n);

Among them, R(n) is the delay autocorrelation function at the nth time, and R(n) is the sum of the P segment delay autocorrelation functions, and the determination rule of the pth segment delay autocorrelation function is:

where r ^* (n) is the conjugate signal of r(n).

S103, using the delay autocorrelation function to perform time-frequency synchronization.

Specifically, the above formula (11) can be transformed into:

Among them, N is the length of the spreading sequence, N=PK, P is the number of segments, including 0～P-1 segment, p is any segment in the 0～P-1 segment, K is the spreading factor, including 0～K- 1, k is any value from 0 to K-1; according to the definition of the partial spreading sequence S[k], the value of S[pK+k] is the same, therefore, equation (12) can be transformed into:

R(n)=R ₀ (n)+…+R _P-1 (n) (13)

It can be seen that the delay autocorrelation function has a total of P segments, and the delay autocorrelation function of each segment is: R ₀ (n), R ₁ (n), R ₂ (n)... R _P-1 (n). The delayed autocorrelation function R _p (n) for each segment is:

It can be seen that Equation (14) is also a sliding window model, and the length of the sliding window is K. Therefore, using the iterative calculation method shown in Equation (6), Equation (14) can be expressed as:

R _p (n+1)=S[pK+k]R _p (n)+S[pK+k]r ^* (n+pK+k)r ^* (n+pK+kN)

-S[pK+k]r ^* [n+(p+1)K+k]r ^* [n+(p+1)K+kN]

Further, considering that the value of S[pK+k] is 1 or -1, equation (14) can be simplified as:

It can be seen that, using equations (13) and (15) to realize the delay correlation operation shown in equation (11), the required computational complexity is only 1 complex multiplier and P+2P complex adders. The hardware resource overhead occupied by the adder is greatly reduced.

It should be noted that the spread spectrum sequence S[k] can be an m sequence or a Golden sequence, and the above-mentioned delay autocorrelation determination rule combined with the properties of the spread spectrum sequence can further reduce the calculation required for formula (11) the complexity. For example, consider the simplest case where the spreading sequence degenerates to a constant. Take the spreading sequence as an m sequence as an example, and the value of S[k] is all 1 or -1. At this time:

Summing up both sides of the equation respectively, then equation (16) can be simplified as:

It can be found that formula (17) is consistent with formula (6), which proves that the above calculation process is completely correct. Secondly, we can consider the special case where S[k] is {1, -1, 1, -1, ..., 1, -1}, then:

Further simplification, we get:

It can be seen that, using equations (17) and (19) to realize the delay correlation operation shown in equation (11), the required computational complexity is only 1 complex multiplier and P+2 complex adders. The hardware resource overhead occupied by the adder is greatly reduced. In fact, the case where S[k] is {1, -1, 1, -1, ..., 1, -1} requires the most adder resources, when S[k] contains consecutive 1 or In the case of continuous -1, the required adder resources will also be reduced. Referring to FIG. 4 , it is a low-complexity delay correlation calculation architecture of a partial spread spectrum synchronization sequence provided by an embodiment of the present invention.

From the above, it can be seen that this scheme proposes a low implementation complexity architecture for the synchronization method based on the partial spread spectrum synchronization sequence. The delay-dependent multi-stage multiplexing iterative computing architecture significantly reduces the computing resources required by the method.

The synchronization apparatus provided by the embodiment of the present invention is introduced below, and the synchronization apparatus described below and the synchronization method described above can be referred to each other.

Referring to FIG. 5, a schematic structural diagram of a synchronization apparatus based on a partial spread spectrum synchronization sequence provided by an embodiment of the present invention includes:

a signal receiving module 100, configured to acquire a received signal, where the synchronization sequence of the received signal is a partial spread spectrum synchronization sequence;

A determination module 200, configured to determine the delay autocorrelation function corresponding to the received signal according to the received signal, the spreading sequence, the spreading factor and the delay autocorrelation determination rule; wherein, the delay autocorrelation is determined The rules are determined by iterative calculation;

The synchronization module 300 is configured to perform time-frequency synchronization by using the delay autocorrelation function.

Wherein, the spreading sequence S[k] is an m sequence or a Golden sequence.

The determining module is specifically used to: determine the received signal r(n), the spreading sequence S[k] and the spreading factor K, and determine the delay autocorrelation function based on the delay autocorrelation determination rule; The length is N, N=PK, and P is the number of segments;

Among them, the delay autocorrelation determination rule is:

R(n)=R ₀ (n)+...+R _P-1 (n);

Among them, R(n) is the delay autocorrelation function at the nth time, and R(n) is the sum of the P segment delay autocorrelation functions, and the determination rule of the pth segment delay autocorrelation function is:

where r ^* (n) is the conjugate signal of r(n).

Referring to FIG. 6, an embodiment of the present invention provides a schematic structural diagram of an electronic device, including:

memory 11 for storing computer programs;

The processor 12 is configured to implement the steps of the synchronization method based on the partial spread spectrum synchronization sequence described in the foregoing method embodiments when executing the computer program.

In this embodiment, the device may be a PC (Personal Computer, personal computer), or may be a terminal device such as a smart phone, a tablet computer, a palmtop computer, and a portable computer.

The device may include a memory 11 , a processor 12 and a bus 13 .

The memory 11 includes at least one type of readable storage medium, including flash memory, hard disk, multimedia card, card-type memory (eg, SD or DX memory, etc.), magnetic memory, magnetic disk, optical disk, and the like. The memory 11 may in some embodiments be an internal storage unit of the device, such as a hard disk of the device. In other embodiments, the memory 11 may also be an external storage device of the device, such as a plug-in hard disk equipped on the device, a smart memory card (SmartMedia Card, SMC), a secure digital (Secure Digital, SD) card, a flash memory card ( Flash Card), etc. Further, the memory 11 may also include both an internal storage unit of the device and an external storage device. The memory 11 can be used not only to store application software installed in the device and various types of data, such as program codes for executing the synchronization method, etc., but also to temporarily store data that has been output or will be output.

The processor 12 may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor or other data processing chips in some embodiments, for running program codes or processing stored in the memory 11 Data, such as program code that executes a synchronized method, etc.

The bus 13 may be a peripheral component interconnect (PCI for short) bus or an extended industry standard architecture (Extended industry standard architecture, EISA for short) bus or the like. The bus can be divided into address bus, data bus, control bus and so on. For ease of presentation, only one thick line is used in FIG. 6, but it does not mean that there is only one bus or one type of bus.

Further, the device may also include a network interface 14, and the network interface 14 may optionally include a wired interface and/or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), which is usually used between the device and other electronic devices Establish a communication connection.

Optionally, the device may further include a user interface 15, the user interface 15 may include a display, an input unit such as a keyboard, and the optional user interface 15 may also include a standard wired interface and a wireless interface. Optionally, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode, organic light-emitting diode) touch device, and the like. Among them, the display may also be appropriately referred to as a display screen or a display unit, for displaying information processed in the device and for displaying a visual user interface.

FIG. 6 only shows the device with components 11-15. Those skilled in the art can understand that the structure shown in FIG. Either some components are combined, or different component arrangements.

Embodiments of the present invention further provide a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the partial spread spectrum-based synchronization described in the foregoing method embodiments is implemented Sequence of steps of the synchronization method.

Wherein, the storage medium may include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other various storage media that can store program codes medium.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. A synchronization method based on a partial spread spectrum synchronization sequence, comprising:

acquiring a received signal, wherein a synchronization sequence of the received signal is a partial spread spectrum synchronization sequence;

determining a delay autocorrelation function corresponding to the received signal according to the received signal, a spreading sequence, a spreading factor and a delay autocorrelation determination rule; wherein, the time delay autocorrelation determination rule is determined by an iterative computation mode;

performing time-frequency synchronization by using the time-delay autocorrelation function;

determining a delay autocorrelation function corresponding to the received signal according to the received signal, the spreading sequence, the spreading factor and a preset delay autocorrelation determination rule, including:

determining a received signal r (n), a spreading sequence S [ K ] and a spreading factor K, and determining a delay autocorrelation function based on a delay autocorrelation determination rule; the length of the spreading sequence is N, wherein N is PK, and P is the number of segments;

wherein, the time delay autocorrelation determination rule is as follows:

R(n)＝R₀(n)+…+R_P-1(n)；

wherein, r (n) is a delay autocorrelation function at the nth time, and r (n) is a sum of P sections of delay autocorrelation functions, wherein the P sections of delay autocorrelation functions are determined by the following rules:

wherein r is^*And (n) is the conjugate signal of r (n).

2. Synchronization method according to claim 1, characterized in that the spreading sequence S [ k ] is an m-sequence or a Golden sequence.

3. A synchronization apparatus based on a partial spread spectrum synchronization sequence, comprising:

a signal receiving module, configured to acquire a received signal, where a synchronization sequence of the received signal is a partial spread spectrum synchronization sequence;

a determining module, configured to determine a delay autocorrelation function corresponding to the received signal according to the received signal, a spreading sequence, a spreading factor, and a delay autocorrelation determination rule; wherein, the time delay autocorrelation determination rule is determined by an iterative computation mode;

the synchronization module is used for carrying out time-frequency synchronization by utilizing the time-delay autocorrelation function;

wherein the determining module is specifically configured to: determining a received signal r (n), a spreading sequence S [ K ] and a spreading factor K, and determining a delay autocorrelation function based on a delay autocorrelation determination rule; the length of the spreading sequence is N, wherein N is PK, and P is the number of segments;

wherein, the time delay autocorrelation determination rule is as follows:

R(n)＝R₀(n)+…+R_P-1(n)；

wherein, r (n) is a delay autocorrelation function at the nth time, and r (n) is a sum of P sections of delay autocorrelation functions, wherein the determination rule of the P section of delay autocorrelation function is as follows:

wherein r is^*And (n) is the conjugate signal of r (n).

4. The synchronization apparatus according to claim 3, wherein the spreading sequence S [ k ] is an m-sequence or a Golden sequence.

5. An electronic device, comprising:

a memory for storing a computer program;

a processor for implementing the steps of the synchronization method based on a partial spread spectrum synchronization sequence according to claim 1 or 2 when executing said computer program.

6. A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the synchronization method based on a partial spread spectrum synchronization sequence according to claim 1 or 2.

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