音频及部分频带干扰下多音调制直接序列扩频的抗干扰性能  

Anti-jamming performance of multi-tone DSSS in the presence of tone and partial band interference

作　　者：和欣[1] 张晓林[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《通信学报》2010年第8期75-83,共9页Journal on Communications

基　　金："十一五"国防预研重大项目(513060501)~~

摘　　要：多音调制直接序列扩频(multi-tone DSSS)中非正交子载波的频谱重叠会导致窄带干扰,同时对每个子载波产生不同程度影响,而并非若干相同单载波情形的叠加。通过对单用户及异步多用户MT系统在音频及部分频带干扰下相关检测判决统计量及平均误码率的理论计算,完成了干扰机理的定量分析,并通过数值仿真对结果进行验证。结果表明,与单载波直接序列扩频(SC-DSSS)、正交多载波直接序列扩频(正交MC-DSSS)相比,MT系统在同等接收机复杂度及相同频带利用率下具有更高的处理增益,可有效抑制内部子载波串扰,并对外部窄带干扰及多址干扰具有良好的抗干扰性能,是一种低复杂度、高可靠性宽带扩频体制。Due to the substantial spectral overlap of non-orthogonal subcarriers in multi-tone direct sequence spread spectrum（MT）,the affect caused by narrowband jamming on each subcarrier simultaneously was induced to different extent rather than the sum up of several identical cases of jammed single-carrier DSSS.Through the quantitative analysis of the above case,the decision statistics and averaged bit error rate of correlative detected single/multiuser MT system with tone and partial band jamming were calculated analytically,which was verified through the numerical simulations.The results show that,under the condition of equivalent receiver complexity and same bandwidth efficiency MT has much larger processing gain compared with single-carrier DSSS and orthogonal multicarrier DSSS,which is capable of effectively suppresses the internal inter-subcarrier interference,while has good anti-jamming capability against narrow-band and multiuser interference.

关 键 词：多音调制直接序列扩频 音频干扰 部分频带干扰 异步多址干扰 相关判决统计量 

分 类 号：TN914.42[电子电信—通信与信息系统]