Reconstruction method and device for multi-carrier differential chaos shift keying (DCSK) signal

Patent metadata

Field	Value
Publication number	US-11888657-B2
Application number	US-202318464128-A
Country	US
Kind code	B2
Filing date	Sep 8, 2023
Priority date	May 22, 2023
Publication date	Jan 30, 2024
Grant date	Jan 30, 2024

Abstract

A reconstruction method for DCSK signals is provided. An information bit sequence to be transmitted is acquired, which is processed by serial-to-parallel conversion. A processed information bit sequence is input into a modulator for modulation to obtain a modulated signal matrix. Cross multiplication is performed between the modulated signal matrix and a chaotic signal to obtain an original information-bearing matrix, which is reconstructed according to a predetermined reconstruction matrix to obtain an information-bearing reconstruction matrix. A transmission symbol is generated according to the information-bearing reconstruction matrix and a reference signal matrix in combination with frame structure information of the transmission symbol, and is sent to a receiving end via a wireless network to demodulate a received signal according to a reconstruction matrix. A reconstruction device for DCSK signals is also provided.

First claim

What is claimed is:

1. A reconstruction method for a multi-carrier Differential Chaos Shift Keying (DCSK) signal, comprising:
acquiring an information bit sequence to be transmitted;
processing the information bit sequence by serial-to-parallel conversion; and inputting a processed information bit sequence into a modulator for modulation to obtain a modulated signal matrix;
performing cross multiplication on the modulated signal matrix and a chaotic signal to obtain an original information-bearing matrix;
reconstructing the original information-bearing matrix according to a predetermined reconstruction matrix to obtain an information-bearing reconstruction matrix; and
generating a transmission symbol according to the information-bearing reconstruction matrix and a reference signal matrix in combination with frame structure information of the transmission symbol; and sending the transmission symbol to a receiving end via a wireless network to enable the receiving end to demodulate a received signal according to the predetermined reconstruction matrix.

2. The reconstruction method of claim 1 , wherein the step of “reconstructing the original information-bearing matrix according to a predetermined reconstruction matrix to obtain the information-bearing reconstruction matrix” comprises:
dividing the original information-bearing matrix into M original information-bearing submatrices according to the number M of subcarriers of a DCSK system;
according to M predetermined reconstruction matrices, performing a Hadamard product between each of the M original information-bearing submatrices and a corresponding predetermined reconstruction matrix to obtain M information-bearing reconstruction submatrices; and
summing the M information-bearing reconstruction submatrices to obtain the information-bearing reconstruction matrix.

3. The reconstruction method of claim 1 , wherein the received signal is demodulated by the receiving end according to the predetermined reconstruction matrix through steps of:
performing filter matching, by the receiving end, for the received signal, and obtaining a received signal matrix in combination with a predetermined channel response model matrix; and decomposing the received signal matrix into a reference matrix and an information-bearing matrix; and
calculating a decision metric matrix based on the reference matrix, the information-bearing matrix, and the predetermined reconstruction matrix; and restoring the received signal based on the decision metric matrix in combination with a decision rule.

4. The reconstruction method of claim 3 , wherein the received signal matrix is expressed as:
R k,rec =[e k,ref ,ê k,inf ]⊗H+N;
wherein R k,rec is the received signal matrix; e k,ref is the reference signal matrix; ê k,inf is the information-bearing reconstruction matrix; H is the predetermined channel response model matrix; and N is an Additive White Gaussian Noise (AWGN) matrix; and
the decision metric matrix is expressed as:
D k,j =R k,ref *V⊙Λ j ⊙R k,inf ;

wherein R k,ref is the reference matrix; R k,inf is the information-bearing matrix; * is a Kronecker product operation; V is an all-ones matrix with a size of 1×M; and Λ 1 is the predetermined reconstruction matrix.

5. The reconstruction method of claim 1 , wherein the reference signal matrix is generated through steps of:
equally distributing elements of the chaotic signal according to the number of subcarriers of a DCSK system to obtain the reference signal matrix.

6. A reconstruction device for a multi-carrier DCSK signal, comprising:
an information bit acquisition unit;
a signal modulation unit;
an original information-bearing matrix generating unit;
an information-bearing matrix reconstruction unit; and
a transmission symbol generating unit;
wherein the information bit acquisition unit is configured for acquiring an information bit sequence to be transmitted;
the signal modulation unit is configured for processing the information bit sequence by serial-to-parallel conversion, and inputting a processed information bit sequence into a modulator for modulation to obtain a modulated signal matrix;
the original information-bearing matrix generating unit is configured for performing cross multiplication on the modulated signal matrix and a chaotic signal to obtain an original information-bearing matrix;
the information-bearing matrix reconstruction unit is configured for reconstructing the original information-bearing matrix according to a predetermined reconstruction matrix to obtain an information-bearing reconstruction matrix; and
the transmission symbol generating unit is configured for generating a transmission symbol according to the information-bearing reconstruction matrix and a reference signal matrix in combination with frame structure information of the transmission symbol, and sending the transmission symbol to a receiving end via a wireless network to enable the receiving end to demodulate a received signal according to the predetermined reconstruction matrix.

7. The reconstruction device of claim 6 , wherein the information-bearing matrix reconstruction unit is further configured to perform:
dividing the original information-bearing matrix into M original information-bearing submatrices according to the number M of subcarriers of a DCSK system;
according to M predetermined reconstruction matrices, performing a Hadamard product between each of the M original information-bearing submatrices and a corresponding predetermined reconstruction matrix to obtain M information-bearing reconstruction submatrices; and
summing the M information-bearing reconstruction submatrices to obtain the information-bearing reconstruction matrix.

8. The reconstruction device of claim 6 , wherein the receiving end is configured for:
performing filter matching for the received signal, and obtaining a received signal matrix in combination with a predetermined channel response model matrix;
decomposing the received signal matrix into a reference matrix and an information-bearing matrix; and
calculating a decision metric matrix based on the reference matrix, the information-bearing matrix, and the predetermined reconstruction matrix; and restoring the received signal based on the decision metric matrix in combination with a decision rule.

9. The reconstruction device of claim 8 , wherein the received signal matrix is expressed as:
R k,rec =[e k,ref ,ê k,inf ]⊗H+N;
wherein R k,rec is the received signal matrix; e k,ref is the reference signal matrix; ê k,inf is the information-bearing reconstruction matrix; H is the predetermined channel response model matrix; and N is an Additive White Gaussian Noise (AWGN) matrix; and
the decision metric matrix is expressed as:
D k,j =R k,ref *V⊙Λ j ⊙R k,inf ;

wherein R k,ref is the reference matrix; R k,inf is the information-bearing matrix; * is a Kronecker product operation; V is an all-ones matrix with a size of 1×M; and Λ 1 is the predetermined reconstruction matrix.

10. The reconstruction device of claim 6 , further comprising:
a reference signal matrix generating unit;
wherein the reference signal matrix generating unit is configured for equally distributing elements of the chaotic signal according to the number of subcarriers of a DCSK system to obtain the reference signal matrix.

Assignees

• Univ Guangdong Technology

Inventors

• Fang Yi
• Tao Yiwei
• Lv Liang
• Lu Yujing
• Han Guojun

Classifications

• H04L27/001 Primary

  using chaotic signals (for secret or secure communication H04L9/001) · CPC title

• H04L27/12

  Modulator circuits; Transmitter circuits · CPC title

• H04L27/148 Primary

  using filters, including PLL-type filters · CPC title

• H04L27/2626

  Arrangements specific to the transmitter only · CPC title

• H04L27/2647

  Arrangements specific to the receiver only (equalisation H04L27/01) · CPC title