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

摘要/Abstract

摘要：

针对盲源分离技术在低信噪比尤其是扩频通信门限信噪比下分离性能恶化的问题,提出了一种改进的基于盲源分离的扩频通信抗干扰算法。该算法首先检测盲源分离算法输出结果的模糊性;然后利用检测结果对分离矩阵进行修正;最后通过对多个修正后的矩阵进行累加,得到新的分离矩阵,将其应用于系统的干扰分离。该算法实现结构简单,可实现扩频系统在解调门限处的抗干扰通信。仿真结果表明,在负信噪比下通过该算法去除干扰后的通信信号解调误码性能依然接近理论性能。

关键词: 扩频通信, 盲源分离, 抗干扰, 低信噪比, 理论性能

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

中图分类号:

TN911.7

赵伟,侴胜男,杨烁,李雄飞. 采用盲源分离的扩频通信抗干扰算法[J]. 西安电子科技大学学报, 2020, 47(1): 73-79.

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.

图/表 7

图1

图2

表1

矩阵元素修正因子"

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

表1

图3

表2

图4

图5

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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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