CN112671431A - Synchronization method, apparatus, device and medium based on partial spread spectrum synchronization sequence - Google Patents
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Abstract
The invention discloses a synchronization method based on a partial spread spectrum synchronization sequence, which comprises the following steps: acquiring a received signal, wherein a synchronization sequence of the received signal is a partial spread spectrum synchronization sequence; determining a corresponding time delay autocorrelation function according to a received signal, a spreading sequence, a spreading factor and a time delay autocorrelation determination rule; wherein, the time delay autocorrelation determination rule is determined by an iterative computation mode; and performing time-frequency synchronization by using the time-delay autocorrelation function. Therefore, in the scheme, when the time-frequency synchronization is carried out by using the repeated structure in part of the spread spectrum synchronization sequence, the time-delay autocorrelation function of the received signal can be determined by the time-delay autocorrelation determining rule with the iterative computation mode, and the time-frequency synchronization is carried out by the time-delay autocorrelation function, so that the hardware resources required by the computation are reduced on the basis of improving the synchronization performance. The invention also discloses a synchronization device, equipment and a medium based on the partial spread spectrum synchronization sequence, and the technical effects can be realized.
Description
Technical Field
The present invention relates to the field of mobile communication system technology, and more particularly, to a synchronization method, apparatus, device and medium based on a partial spread spectrum synchronization sequence.
Background
Time-frequency synchronization is one of the core components of receiver design and is the basis for normal communication of transceivers. An OFDM (Orthogonal Frequency Division Multiplexing)/SCFDE (single carrier-Frequency Domain Equalization) system is two typical systems of a broadband wireless communication system, and its Frequency synchronization method is most typical with an S & C method, and its basic idea is to transmit a synchronization sequence with a repetitive structure at a transmitting end, and a receiving end searches for an extreme point of a delay correlation function by calculating the delay correlation function of a received signal to realize symbol timing synchronization, and simultaneously, realizes Frequency offset estimation by using phase information of the extreme point. Although many subsequent scholars propose a series of new synchronization methods, the core of the synchronization methods does not depart from the theoretical framework of the S & C method.
The basic idea is to spread spectrum process a part of the classic synchronization sequence, the receiving end first carries out corresponding de-spread process and then carries out time delay correlation operation, and the position and phase of the extreme point of the time delay correlation function are also used to realize time frequency synchronization. The implementation complexity is another important index for measuring the performance of the synchronization method, and is an important factor for restricting the miniaturization/low power consumption and low cost design of equipment. For example: the mimo technology is an important means capable of significantly improving transmission capacity or reliable transmission capability of a communication system, and has been widely applied to civil cellular or ad hoc network communication terminals and systems, however, the implementation complexity of the mimo technology is increased in a linear manner while improving communication performance, and therefore, to implement a miniaturized/low power consumption design of mimo devices, it is necessary to study the low-complexity implementation of time-frequency synchronization and other communication components.
Therefore, how to reduce the required computing resources on the basis of fully utilizing the repetition structure in part of the spread spectrum synchronization sequence to perform time frequency synchronization is a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a synchronization method, a synchronization device, synchronization equipment and a synchronization medium based on a partial spread spectrum synchronization sequence, so as to reduce required computing resources on the basis of fully utilizing a repeating structure in the partial spread spectrum synchronization sequence to carry out time-frequency synchronization.
In order to achieve the above object, the present invention provides a synchronization method based on a partial spread spectrum synchronization sequence, including:
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;
and performing time-frequency synchronization by using the time-delay autocorrelation function.
Wherein the spreading sequence S [ k ] is an m sequence or a Golden sequence.
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)+…+RP-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).
To achieve the above object, the present invention further provides 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;
and the synchronization module is used for carrying out time-frequency synchronization by utilizing the time-delay autocorrelation function.
Wherein the spreading sequence S [ k ] is an m sequence or a Golden sequence.
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)+…+RP-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).
To achieve the above object, the present invention further provides an electronic device comprising:
a memory for storing a computer program;
a processor for implementing the steps of the above-described synchronization method based on a partial spread spectrum synchronization sequence when executing the computer program.
To achieve the above object, the present invention further provides a computer-readable storage medium having stored thereon a computer program, which when executed by a processor, implements the steps of the above synchronization method based on a partial spread spectrum synchronization sequence.
According to the above scheme, the synchronization method based on the partial spread spectrum synchronization sequence provided by the embodiment of the present invention includes: 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; and performing time-frequency synchronization by using the time-delay autocorrelation function.
Therefore, in the scheme, when the time-frequency synchronization is carried out by using the repeated structure in part of the spread spectrum synchronization sequence, the time-delay autocorrelation function of the received signal can be determined by the time-delay autocorrelation determining rule with the iterative computation mode, and the time-frequency synchronization is carried out by the time-delay autocorrelation function, so that the hardware resources required by the computation are reduced on the basis of improving the synchronization performance. The invention also discloses a synchronization device, equipment and a medium based on the partial spread spectrum synchronization sequence, and the technical effects can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a synchronization sequence delay correlation synchronization algorithm with a repeating structure according to an embodiment of the present invention;
FIG. 2 is a diagram of a structure of a spread spectrum synchronization sequence according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a synchronization method based on a partial spread spectrum synchronization sequence according to an embodiment of the present invention;
FIG. 4 is a block diagram of a partial spread spectrum synchronization sequence low complexity delay correlation calculation architecture according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a synchronization apparatus based on a partial spread spectrum synchronization sequence according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, in the classical S & C delay correlation synchronization algorithm, a synchronization symbol is composed of several parts that are completely equal in time domain, see fig. 1, which is a schematic diagram of a synchronization sequence delay correlation synchronization algorithm with a repeating structure disclosed in the embodiments of the present invention, and according to the repeating structure of a synchronization sequence, a metric function is constructed by using delay correlation operation to obtain timing and frequency offset estimates, where the metric function can be represented as:
wherein the content of the first and second substances,
n in the above formula represents the length of an OFDM symbol or SCFDE symbol. At this time, the symbol timing estimate is:
wherein d represents the serial number of the first sampling point of the sliding correlation window, and P (d) is the result of performing delay correlation operation on the received signal, and because the synchronization sequence has the repetitive characteristic, the delay correlation value will have a peak value at the position of the synchronization sequence, and the timing estimation can be realized by searching the maximum peak value of the metric function. And the frequency offset estimation value is obtained by delaying the phase of the correlation value at a timing point:
wherein ε and
respectively representing subcarrier normalized frequency offset machine estimation values. In implementation, equation (2) may be transformed into an iterative computation pattern shown in equation (6):
P(d+1)＝P(d)+r*(d+k)r(d+k-N)-r*(d+k-N)r(d+k-2N) (6)
it can be seen that, with the delay correlation calculation method shown in equation (6), delay correlation can be achieved only by 1 complex multiplier and 2 complex adders, and the calculation complexity is significantly reduced compared to equation (2).
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, and refer to fig. 2, which is a structural diagram of the partial spread spectrum synchronization sequence. Referring to fig. 2, it is assumed that the synchronization sequence is composed of 2 segments of sequences a and S (a), wherein the S (a) sequence is obtained by multiplying the sequence a by the corresponding spreading sequence S [ k ], that is:
S(A)[k]＝A[k]*S[k] (7)
wherein the spreading sequence S [ k ]]Is an m-sequence or Golden sequence, each element of which has a duration of T, KTs，TsFor the sampling period of the synchronization sequence, K is a partial spreading factor, which is determined according to the bandwidth and the length of the synchronization sequence with the repeating structure, and generally, K is a positive integer greater than 1.
Accordingly, the delayed autocorrelation function of the partial spreading synchronization sequence may be calculated according to equation (8):
due to the introduction of the spread spectrum sequence, the amplitude of the delay autocorrelation function of the received signal has a sharp correlation peak, the symbol timing synchronization can be realized by accurately detecting the position of the peak, and the symbol timing synchronization has high stability and accuracy. On the other hand, the phase of the peak value and the normalized frequency offset epsilon satisfy the relationship shown in equation (9) without considering the influence of noise:
wherein the content of the first and second substances,
the peak value of the time delay autocorrelation curve is expressed, and according to the formula (9), the estimated value of the normalized frequency deviation epsilon can be obtained
Is epsilon:
as shown in equation (8), since extra despreading operation is required, the computation complexity of the delay correlation function is high, and therefore, the computation complexity of the algorithm needs to be reduced to enhance the practicability of the algorithm.
Considering that Sk is m sequence or Golden sequence, and the value is-1 or +1, the time delay correlation calculation shown in the formula (8) can be expressed as
Wherein N represents the length of the specific repeat structure sequence. Note that the delayed autocorrelation calculation of the partial spreading synchronization sequence described by equation (11) mainly involves two processes of delayed autocorrelation calculation and despreading. Because the multiplication operation meets the switching law and the combination law, the delayed autocorrelation calculation of part of the spread spectrum synchronous sequence can firstly carry out delayed correlation operation, and then the result of the delayed correlation is multiplied by the spread spectrum sequence to carry out despreading operation, wherein the sum of N sequences obtained by multiplying the result of the delayed correlation and the spread spectrum sequence is accumulated, so 1 complex multiplier and N complex adders are needed to realize the calculation, and the hardware resource cost occupied by the required adders is very large.
Therefore, in the present application, in combination with the characteristic of the spreading sequence Sk, a synchronization method, apparatus, device and medium based on a partial spreading synchronization sequence are provided to reduce the computation complexity and reduce the required computation resources on the basis of fully utilizing the repetition structure in the partial spreading synchronization sequence to perform time-frequency synchronization.
Referring to fig. 3, an embodiment of the present invention provides a synchronization method based on a partial spread spectrum synchronization sequence, including:
s101, acquiring a received signal, wherein a synchronization sequence of the received signal is a partial spread spectrum synchronization sequence;
it should be noted that, when the sending 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, and as shown in fig. 2, the partial spread spectrum synchronization sequence has two parts: sequences A and S (A). After receiving the signal, the receiving end detects the existence of the synchronization sequence in the received signal to realize the positioning of the data frame, namely: the symbol timing synchronization is realized by calculating a delay autocorrelation function matched with a synchronization sequence repetition structure and detecting the peak value of the delay autocorrelation function, and further, the carrier frequency offset estimation is realized by the phase of the delay autocorrelation function.
S102, determining a delay autocorrelation function corresponding to a 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;
in this embodiment, the process of 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 includes: 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)+…+RP-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).
And S103, performing time-frequency synchronization by using the time-delay autocorrelation function.
Specifically, the above formula (11) can be converted into:
wherein, N is the length of the spread spectrum sequence, N is PK, P is the number of segments and comprises 0-P-1 segments, P is any one of 0-P-1 segments, K is the spread spectrum factor and comprises 0-K-1, and K is any one of 0-K-1; the values of S [ pK + k ] are the same according to the definition of the partial spreading sequence S [ k ], and thus, the formula (12) can be converted into:
R(n)＝R0(n)+…+RP-1(n) (13)
it can be seen that the delay autocorrelation function has P segments, and the delay autocorrelation function of each segment is: r0(n)、R1(n)、R2(n)……RP-1(n) of (a). Delayed autocorrelation function R for each segmentp(n) is:
it can be seen that equation (14) is also a sliding window model, and the length of the sliding window is K, so equation (14) can be expressed by using the iterative computation method shown in equation (6):
Rp(n+1)＝S[pK+k]Rp(n)+S[pK+k]r*(n+pK+k)r*(n+pK+k-N)
-S[pK+k]r*[n+(p+1)K+k]r*[n+(p+1)K+k-N]
further, considering that S [ pK + k ] takes a value of 1 or-1, equation (14) can be simplified as:
it can be seen that, by using equations (13) and (15) to implement the delay correlation operation shown in equation (11), the required computation complexity is only 1 complex multiplier and P +2P complex adders, and the hardware resource overhead occupied by the required adders is greatly reduced.
It should be noted that the spreading sequence S [ k ] can be an m-sequence or a Golden sequence, and the above-mentioned delayed autocorrelation determination rule can further reduce the computational complexity required for calculating equation (11) after combining the properties of the spreading sequence. For example, consider a simplest case where the spreading sequence is degraded to a constant, taking the spreading sequence as an m-sequence, where S [ k ] takes all values of 1 or-1, where:
if the two sides of the equation are summed separately, equation (16) can be simplified as:
it can be found that equation (17) is identical to equation (6), proving that the above calculation process is completely correct. Secondly, considering the special case that S [ k ] takes {1, -1, 1, -1, … …, 1, -1}, then:
further simplification, can obtain:
it can be seen that, by using the equations (17) and (19) to implement the delay correlation operation shown in the equation (11), the required computation complexity is only 1 complex multiplier and P +2 complex adders, and the hardware resource overhead occupied by the required adders is greatly reduced. In fact, the condition that S [ k ] takes {1, -1, 1, -1, … …, 1, -1} is that the needed adder resources are the most, and when there are continuous 1 or continuous-1 conditions in S [ k ], the needed adder resources are reduced. Referring to fig. 4, a partial spreading synchronization sequence low-complexity delay correlation calculation architecture according to an embodiment of the present invention is provided.
In summary, the scheme provides a low-implementation complexity architecture for a synchronization method based on a partial spread spectrum synchronization sequence, and the architecture provides a multistage multiplexing iterative computation architecture related to the delay of the partial spread spectrum sequence by fully utilizing a repeating structure in the partial spread spectrum synchronization sequence, thereby significantly reducing the computation resources required by the method.
The following describes a synchronization apparatus provided in an embodiment of the present invention, and the synchronization apparatus described below and the synchronization method described above may 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 according to an embodiment of the present invention includes:
a signal receiving module 100, configured to acquire a received signal, where a synchronization sequence of the received signal is a partial spread spectrum synchronization sequence;
a determining module 200, configured to determine a delay autocorrelation function corresponding to the received signal according to the received signal, the spreading sequence, the spreading factor, and a delay autocorrelation determining rule; wherein, the time delay autocorrelation determination rule is determined by an iterative computation mode;
a synchronization module 300, 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.
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)+…+RP-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).
Referring to fig. 6, an embodiment of the present invention provides a schematic structural diagram of an electronic device, including:
a memory 11 for storing a computer program;
a processor 12 for implementing the steps of the synchronization method based on partial spreading synchronization sequence according to the above-mentioned method embodiments when executing the computer program.
In this embodiment, the device may be a PC (Personal Computer), or may be a terminal device such as a smart phone, a tablet Computer, a palmtop Computer, or 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, which includes a flash memory, a hard disk, a multimedia card, a card type memory (e.g., SD or DX memory, etc.), a magnetic memory, a magnetic disk, an optical disk, and the like. The memory 11 may in some embodiments be an internal storage unit of the device, for example a hard disk of the device. The memory 11 may also be an external storage device of the device in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), etc. provided on the device. Further, the memory 11 may also include both an internal storage unit of the device and an external storage device. The memory 11 may be used not only to store application software installed in the device and various kinds of data such as program codes for performing a synchronization method, etc., but also to temporarily store data that has been output or is to be output.
The processor 12 may be a Central Processing Unit (CPU), controller, microcontroller, microprocessor or other data Processing chip in some embodiments, and is used for executing program codes stored in the memory 11 or Processing data, such as program codes for executing a synchronization method.
The bus 13 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 6, but this is not intended to represent only one bus or type of bus.
Further, the device may further include a network interface 14, and the network interface 14 may optionally include a wired interface and/or a wireless interface (e.g., WI-FI interface, bluetooth interface, etc.), which are generally used to establish a communication connection between the device and other electronic devices.
Optionally, the device may further comprise a user interface 15, the user interface 15 may comprise a Display (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 15 may further comprise a standard wired interface, a wireless interface. Alternatively, 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) touch device, or the like. The display, which may also be referred to as a display screen or display unit, is suitable for displaying information processed in the device and for displaying a visualized user interface.
Fig. 6 only shows the device with the components 11-15, and it will be understood by those skilled in the art that the structure shown in fig. 6 does not constitute a limitation of the device, and may comprise fewer or more components than those shown, or some components may be combined, or a different arrangement of components.
The embodiment of the present invention further provides 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 computer program implements the steps of the synchronization method based on the partial spread spectrum synchronization sequence described in the above method embodiment.
Wherein the storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable 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 applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
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;
and performing time-frequency synchronization by using the time-delay autocorrelation function.
2. Synchronization method according to claim 1, characterized in that the spreading sequence S [ k ] is an m-sequence or a Golden sequence.
3. The synchronization method according to claim 1, wherein determining the delayed autocorrelation function corresponding to the received signal according to the received signal, the spreading sequence, the spreading factor and a predetermined delayed autocorrelation determination rule comprises:
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)+…+RP-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. 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;
and the synchronization module is used for carrying out time-frequency synchronization by utilizing the time-delay autocorrelation function.
5. The synchronization apparatus according to claim 4, wherein the spreading sequence S [ k ] is an m-sequence or a Golden sequence.
6. The synchronization device according to claim 4,
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)+…+RP-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).
7. 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 any one of claims 1 to 3 when executing said computer program.
8. 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 partial spread spectrum synchronization sequences according to any one of claims 1 to 3.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113141245A (en) * | 2021-06-22 | 2021-07-20 | 中国人民解放军国防科技大学 | Time-frequency synchronization method, system, equipment and readable storage medium |
| CN113315733A (en) * | 2021-07-13 | 2021-08-27 | 中国人民解放军国防科技大学 | Time-frequency synchronization method, communication system and storage medium |
| CN114884536A (en) * | 2022-05-06 | 2022-08-09 | 中国人民解放军国防科技大学 | Anti-interference time-frequency synchronization method, device, equipment and medium |
| CN116405055A (en) * | 2023-06-07 | 2023-07-07 | 中国人民解放军国防科技大学 | Spread spectrum communication method, system and related device |
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| CN113141245A (en) * | 2021-06-22 | 2021-07-20 | 中国人民解放军国防科技大学 | Time-frequency synchronization method, system, equipment and readable storage medium |
| CN113315733A (en) * | 2021-07-13 | 2021-08-27 | 中国人民解放军国防科技大学 | Time-frequency synchronization method, communication system and storage medium |
| CN113315733B (en) * | 2021-07-13 | 2021-11-02 | 中国人民解放军国防科技大学 | Time-frequency synchronization method, communication system and storage medium |
| CN114884536A (en) * | 2022-05-06 | 2022-08-09 | 中国人民解放军国防科技大学 | Anti-interference time-frequency synchronization method, device, equipment and medium |
| CN116405055A (en) * | 2023-06-07 | 2023-07-07 | 中国人民解放军国防科技大学 | Spread spectrum communication method, system and related device |
| CN116405055B (en) * | 2023-06-07 | 2023-08-29 | 中国人民解放军国防科技大学 | Spread spectrum communication method, system and related device |
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