CN111917435A - Multimodal code shift keying signal synchronization method based on peak delay difference - Google Patents

Multimodal code shift keying signal synchronization method based on peak delay difference Download PDF

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CN111917435A
CN111917435A CN202010015666.XA CN202010015666A CN111917435A CN 111917435 A CN111917435 A CN 111917435A CN 202010015666 A CN202010015666 A CN 202010015666A CN 111917435 A CN111917435 A CN 111917435A
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ccsk
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CN111917435B (en
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邹德岳
李欣玥
刘鑫
赵楠
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Dalian University of Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/7075—Synchronisation aspects with code phase acquisition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking

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  • Computer Networks & Wireless Communication (AREA)
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  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

The invention provides a multimodal code shift keying signal synchronization method based on peak delay difference, which belongs to the technical field of wireless communication and comprises a characteristic test process and a signal synchronization process. Firstly, a fitting relation of x and y is obtained through characteristic test, and then signal synchronization is carried out according to the fitting relation. Compared with the traditional synchronization technology of the CCSK signal (or the multi-peak CCSK signal), the method has the advantages that the synchronization of the received signal and the local signal can be realized only by carrying out correlation operation on the received signal and the local PN sequence for a plurality of times, and the time of the synchronization process is greatly reduced. The synchronization process is short in realization time and high in synchronization efficiency.

Description

Multimodal code shift keying signal synchronization method based on peak delay difference
Technical Field
The invention belongs to the technical field of wireless communication, relates to synchronization of spread spectrum signals, and particularly relates to a method for synchronizing spread spectrum signals modulated by a Cyclic Code Shift Keying (CCSK) technology.
Background
With the rapid development of spread spectrum communication, the synchronization technology of spread spectrum signals has become diversified. In the document, "multi-peak CCSK signal self-synchronization method based on multi-period joint analysis", if synchronization of spread spectrum signals modulated by the conventional CCSK technology is to be achieved, a local Pseudo-Noise (Pseudo-Noise) sequence of a complete period needs to be traversed, and N correlation operations (N is a sampling number of each Pseudo-random sequence period) need to be performed altogether. The realization process is long in time and low in efficiency.
In the invention, the signals can be synchronized only by a plurality of correlation operations. Compared with the synchronization technology of the traditional CCSK signal (or the multi-peak CCSK signal improved on the basis of the traditional CCSK signal), the method has the advantages that the time of the synchronization process can be reduced, and the synchronization efficiency is improved.
Disclosure of Invention
The invention aims to solve the technical problems of long time, low efficiency and low data transmission rate in the process of synchronizing spread spectrum signals. The invention aims to improve the original spread spectrum signal synchronization technology, reduce the synchronization time and improve the speed.
In order to achieve the purpose, the invention adopts the technical scheme that:
a multimodal code shift keying signal synchronization method based on peak delay difference comprises a characteristic test process and a signal synchronization process, and specifically comprises the following steps:
firstly, in the characteristic testing process, a fitting relation of x and y is obtained through characteristic testing.
Step 1.1 sets the code phase offset a to 1.
Step 1.2, from a random bit flip edge, intercepting a two-bit CCSK signal or a multi-peak CCSK signal as a receiving signal, which is denoted as S (i), wherein the value of i is 1-2N, and N is the sampling number of each bit (namely each pseudorandom sequence period).
Step 1.3, a section of received signal S (j + a-1) is intercepted, and correlation operation is carried out with local signal L (j), so as to obtain correlation function R(a)(j) Wherein j is 1-N, and a is the code phase offset. The local signal and the received signal are formed based on the same pseudo-random sequence.
Step 1.4 finding R(a)The element with the maximum absolute value is selected and deletedThe value is denoted by P (a). For a multi-peak CCSK signal, it is necessary to find the elements M large before the absolute value and sum their absolute values, denoted as P' (a), where M is the number of peaks.
Step 1.5 code phase offset a plus 1.
Step 1.6 repeat steps 1.2 to 1.5, repeat N-1 times, get correlation peak value array P composed of N elements.
Step 1.7 repeat steps 1.1 to 1.6, repeat F times, get F correlation peak value arrays P(1)～P(F). To make the data statistically significant, F is any integer greater than 100.
Step 1.8 reaction of P(1)～P(F)Averaging to obtain a statistical correlation peak value array PsWherein
Figure BDA0002358778990000021
Wherein j takes the value of 1-N.
Step 1.9 setting a variable as x and
Figure BDA0002358778990000022
wherein
Figure BDA0002358778990000023
Step 1.10 is to set
Figure BDA0002358778990000024
At this time x and y satisfy a linear relationship.
Step 1.11 fit the relationship of x to y to the form of y ═ cx + b by linear fitting, yielding c and b values.
And step two, a signal synchronization process:
step 2.1 set boot time to x0。
Step 2.2 from x0And intercepting a CCSK signal with the length of 3N or a multi-peak CCSK signal as a receiving signal, which is marked as B (i), wherein the value of i is 1-3N.
Step 2.3 intercepting two sections of received signals
Figure BDA0002358778990000031
And
Figure BDA0002358778990000032
respectively correlated with local signals L (j) to obtain correlation function R(b)(j) And R(c)(j) Wherein j takes the value of 1-N.
Step 2.4 finding R(b)And R(c)The element with the maximum absolute value is recorded as Pb(f) And Pc(f) Wherein f is 1. For a multi-peak CCSK signal, it is necessary to find the element M greater than the absolute value and sum the absolute values of the elements, which are respectively denoted as Pb' (f) and Pc'(f)。
Step 2.5f plus 1.
Step 2.6 repeat step 2.2 to step 2.5, repeat F times, get 2 correlation peak value arrays P respectivelybAnd Pc。
Step 2.7 separately adding PbAnd PcAveraging to obtain two statistical correlation peak values PbwAnd PcwWherein
Figure BDA0002358778990000033
Step 2.8 gives a threshold value of K and 0< K < 0.5.
Step 2.9 let Δ y ═ Pbw-PcwΔ x can be obtained by substituting Δ y into Δ x ═ Δ y/c, where c is obtained from step 1.11.
Step 2.10 calculation of Y | [ Delta ] y>K, adjusting the start time of the receiving sequence to let x0- Δ x is new x0And repeating the step 2.2 to the step 2.10. Until | Δ y ∞<K is even close to 0, it can be determined that the local signal and the received signal are synchronized.
The invention has the advantages that: compared with the traditional synchronization technology of the CCSK signal (or the multi-peak CCSK signal), the method has the advantages that the synchronization of the received signal and the local signal can be realized only by carrying out correlation operation on the received signal and the local PN sequence for a plurality of times, and the time of the synchronization process is greatly reduced. The synchronization process is short in realization time and high in synchronization efficiency.
Detailed Description
The following describes the embodiments of the present invention in detail with reference to the technical solutions.
A multimodal code shift keying signal synchronization method based on peak delay difference comprises a characteristic test process and a signal synchronization process, and specifically comprises the following steps:
the characteristic testing process comprises the following steps:
(1) the code phase offset a is 1.
(2) And intercepting a two-bit CCSK signal or a multi-peak CCSK signal from a random bit flip edge as a receiving signal, which is recorded as S (i), wherein the value of i is 1-8184 (the sampling number of one bit of the CCSK signal is 4092).
(3) Intercepting a section of received signal S (j + a-1) and carrying out correlation operation with local signal L (j) to obtain correlation function R(a)(j) Wherein j is 1-4092.
(4) Find R(a)The element with the largest absolute value is marked as P (a), and the code phase offset a is added by 1. For multi-peak CCSK signals, such as tri-peak CCSK signals, it is desirable to find R(a)The first three elements of the median absolute value are added and the sum is denoted as P' (a).
(5) And repeating the step 2 to the step 4, and repeating 4091 times to obtain a correlation peak value array P consisting of 4092 elements.
(6) Repeating the steps 1 to 5 for 150 times to obtain 150 correlation peak value arrays P(1)～P(150)。
(7) Will P(1)～P(150)Averaging to obtain a statistical correlation peak value array PsWherein
Figure BDA0002358778990000041
Wherein j is 1-4092.
(8) Let a variable be x and 1023< x ≦ 3069(τ 2046).
(9) Let y be Ps(x-1023)-Ps(x + 1023). X and y are fitted by linear fitting to the form y x + b. For example, the function is y-7 x-3654,the c value was 7 and the b value was-3654.
And (3) signal synchronization process:
(10) let the boot time be x0。
(11) From x0And intercepting the CCSK signal with the length of 12276 or the multi-peak CCSK signal as a receiving signal, which is marked as B (i), wherein the value of i is 1-12276.
(12) Intercepting two sections of received signals B (j-1+4092-1023) and B (j-1+4092+1023) to respectively perform correlation operation with the local signal L (j) to obtain a correlation function R(b)(j) And R(c)(j) Wherein j is 1-4092.
(13) Find R(b)And R(c)The element with the largest absolute value is recorded as Pb(f) And Pc(f) Wherein f is 1. For multi-peak CCSK signals, such as tri-peak CCSK signals, it is desirable to find R(b)And R(c)The first three elements of the medium absolute value are added and recorded as Pb' (f) and Pc'(f)。
(14) f plus 1.
(15) Repeating the steps 11 to 14 for 150 times to respectively obtain 2 correlation peak value arrays PbAnd Pc。
(16) Respectively adding PbAnd PcAveraging to obtain two statistical correlation peak values PbwAnd PcwWherein
Figure BDA0002358778990000051
(17) A threshold value K is given as 0.2.
(18) Let Δ y equal Pbw-Pcw. For example, Δ y ═ 406, and substitution into Δ x ═ Δ y/7 yields Δ x ═ 58, where c ═ 7 results from step 9.
(19) If | Δ y | #>0.2, adjust the start time of the receiving sequence to let x0-58 is new x0. Steps 11 to 18 are repeated. Until the | Δ y | is smaller than 0.2 or even close to 0, it can be determined that the local signal and the received signal are truly synchronized.
The above-mentioned embodiments only express the embodiments of the present invention, but not should be understood as the limitation of the scope of the patent of the present invention, it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the concept of the present invention, and these all fall into the protection scope of the present invention.

Claims (1)

1. A multimodal code shift keying signal synchronization method based on peak delay difference is characterized by comprising a characteristic test process and a signal synchronization process, and specifically comprises the following steps:
firstly, in the characteristic testing process, obtaining a fitting relation of x and y through characteristic testing;
step 1.1, setting the code phase offset a to be 1;
step 1.2, intercepting two-bit CCSK signals or multi-peak CCSK signals from a random bit flip edge as receiving signals, and recording as S (i), wherein the value of i is 1-2N, and N is the sampling number of each bit;
step 1.3, a section of received signal S (j + a-1) is intercepted, and correlation operation is carried out with local signal L (j), so as to obtain correlation function R(a)(j) Wherein j takes a value of 1-N, and a is a code phase offset; the local signal and the received signal are formed based on the same pseudo-random sequence;
step 1.4 finding R(a)The element with the largest absolute value is marked as P (a); for a multi-peak CCSK signal, M elements which are large before the absolute value are needed to be found and the absolute values of the M elements are added and are marked as P' (a), wherein M is the number of peaks;
step 1.5, adding 1 to the code phase offset a;
step 1.6, repeating the steps 1.2 to 1.5, repeating the steps for N-1 times to obtain a correlation peak value array P consisting of N elements;
step 1.7 repeat steps 1.1 to 1.6, repeat F times, get F correlation peak value arrays P(1)～P(F)(ii) a To make the data statistically significant, F is any integer greater than 100;
step 1.8 reaction of P(1)～P(F)Averaging to obtain a statistical correlation peak value array PsWherein
Figure FDA0002358778980000011
Wherein j takes the value of 1-N;
step 1.9 setting a variable as x and
Figure FDA0002358778980000021
wherein
Figure FDA0002358778980000022
Step 1.10 is to set
Figure FDA0002358778980000023
At the moment, x and y satisfy a linear relation;
step 1.11, fitting the relation between x and y into a form of y ═ cx + b through linear fitting to obtain a c value and a b value;
and step two, a signal synchronization process:
step 2.1 set boot time to x0；
Step 2.2 from x0Intercepting a CCSK signal with the length of 3N or a multi-peak CCSK signal as a receiving signal, and recording as B (i), wherein the value of i is 1-3N;
step 2.3 intercepting two sections of received signals
Figure FDA0002358778980000024
And
Figure FDA0002358778980000025
respectively correlated with local signals L (j) to obtain correlation function R(b)(j) And R(c)(j) Wherein j takes the value of 1-N;
step 2.4 finding R(b)And R(c)The element with the maximum absolute value is recorded as Pb(f) And Pc(f) Wherein f is 1; for a multi-peak CCSK signal, it is necessary to find the element M greater than the absolute value and sum the absolute values of the elements, which are respectively denoted as Pb'(f) And Pc'(f)；
Step 2.5f, adding 1;
step 2.6 repeat step 2.2 to step 2.5, repeat F times, get 2 correlation peak value arrays P respectivelybAnd Pc；
Step 2.7 separately adding PbAnd PcAveraging to obtain two statistical correlation peak values PbwAnd PcwWherein
Figure FDA0002358778980000026
Step 2.8, a threshold value is given as K, and K is more than 0 and less than 0.5;
step 2.9 let Δ y ═ Pbw-PcwSubstituting Δ y into Δ x ═ Δ y/c, Δ x can be obtained, where c is obtained from step 1.11;
step 2.10 if | Δ y | is greater than K, adjust the start time of the receiving sequence to let x0- Δ x is new x0Repeating the step 2.2 to the step 2.10; until | Δ y | is less than K or even close to 0, it can be determined that the local signal and the received signal are synchronized.
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