采用盲源分离的扩频通信抗干扰算法

doi:10.19665/j.issn1001-2400.2020.01.011

Abstract

Abstract:

An improved anti-jamming algorithm for spread spectrum communication based on blind source separation (BSS) is proposed to solve the problem that the separation performance of BSS technology deteriorates at a low signal-to-noise ratio (SNR), especially at the threshold SNR of spread spectrum communication. First, the algorithm detects the ambiguity of the output of the blind source separation algorithm, and then uses the detection result to correct the separation matrix. Finally, the new separation matrix is obtained by accumulating a plurality of modified matrices, and applied to the jamming separation of the system. The algorithm has a simple structure and can realize anti-jamming communication of the spread spectrum system at the demodulation threshold. Simulation results show that the demodulation error performance of the communication signal after removing the jamming by the algorithm at a negative SNR is still close to the theoretical performance.

Key words: spread spectrum communication, blind source separation, anti-jamming, low signal-to-noise ratio, theoretical performance

CLC Number:

TN911.7

ZHAO Wei,CHOU Shengnan,YANG Shuo,LI Xiongfei. Anti-jamming algorithm for spread spectrum communication using blind source separation[J].Journal of Xidian University, 2020, 47(1): 73-79.

Figures/Tables 7

C₁	C₂	$α$
1	1	1
-1	1	-j
-1	-1	-1
1	-1	j

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信号	参数类型	仿真参数
通信信号	扩频比	64
	调制类型	BPSK
	成型系数	0.35
	符号速率/MHz	10.24
干扰信号	单音/MHz	频点为2.56
	多音/MHz	频点1为2.56、频点2为0.064,频点3为-2.56
	部分频带	信号带宽的50%
	宽带	信号带宽的100%
分离参数	混合类型	线性瞬时混合
	混合矩阵	[-1,1]间均匀分布的随机数
	累加次数	40

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Anti-jamming algorithm for spread spectrum communication using blind source separation

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