一种新颖的直接序列扩频干扰规避通信系统  

A novel direct sequence spread spectrum communication system for avoiding narrow-band interference

作　　者：刘松[1] 张水莲[1] 辛刚[1] 李苏东[2] 

机构地区：[1]国家数字交换系统工程技术研究中心 [2]91230部队

出　　处：《电路与系统学报》2013年第2期152-157,共6页Journal of Circuits and Systems

摘　　要：针对传统直接序列扩频通信系统(DSSS)因扩频增益受限于可用频带资源和系统复杂度而不足以对抗大功率窄带干扰的问题,论证了截断形式数据矩阵的奇异值分解(SVD)的正交分解性质,并由矩阵能量的角度推导了干扰分量与背景噪声分量的分离算法,结合直扩系统干扰规避基本原理得出一种新的能够规避干扰的扩频序列构造方法,且据此设计出了改进的扩频通信系统方案。仿真结果表明,改进后系统不但具有良好的多址能力和低截获特性,而且可以有效避开强干扰,获得了较传统直扩系统更优的误码性能。The traditional direct sequence spread spectrum communication system（DSSS） can’t reject narrow-band interference of high power because its processing gain is limited by frequency resource and system complication.we demonstrated that orthogonal component signals could be generated from singular value decomposition（SVD） using data matrix created by continuous interception of the original signal sequence,and obtained an algorithm to separate interference and noise signals by the energy of data matrix.With basic principle of avoiding interference in DSSS,a new method of designing sequence which can avoid narrow-band interference was proposed and an improved designment of DSSS was given.The simulation results show that the new improved communication system not only has excellent ability of multi-access and low probability of intercept,but also effectively avoids narrow-band interference and has better bit error（BER） performance.

关 键 词：直接序列扩频 奇异值分解 干扰规避 

分 类 号：TN97[电子电信—信号与信息处理]