DS MIMO系统中叠加扩频及SP联合抗干扰  

The Joint Anti-jamming of Superimposed Spread Spectrum and SP in DS MIMO System

作　　者：陈自力[1] 高喜俊[1] 

机构地区：[1]军械工程学院无人机工程系,河北石家庄050003

出　　处：《信号处理》2016年第2期167-172,共6页Journal of Signal Processing

基　　金：装备预先研究项目(51325030202)

摘　　要：针对将直扩(direct spread,DS)与收发多天线(multiple input multiple output,MIMO)空时分组编码相结合存在多址干扰,且受到宽带干扰尤其强干扰时性能会恶化,提出一种叠加扩频的方法来消除多址干扰,并利用子空间分解(subspace projection,SP)的方法实现对宽带干扰的抑制,即将信道和接收矩阵投影到干噪子空间中构建等效矩阵进行译码,其中通过简化的最大比合并译码降低了空时分组译码复杂度。理论分析及仿真表明该抗干扰方案能够提高DS抗窄带干扰能力,并实现抗宽带干扰和对多址干扰的完全抑制。As the direct spread（ DS） combined with multiple input multiple output（ MIMO） space time block codes has multiple access interference,and the performance will be degraded with strong jamming especially wideband jamming. The superimposed spread spectrum was presented to eliminate multiple access interference. The method of subspace projection（ SP） was adopted to suppress wideband jamming which the channel and receiving matrix were projected with the subspace of jamming and noise to set up effective matrix for decoding. Thereinto,the maximal ratio combining was simplified to reduce the complexity of space time block codes. The theoretical analysis and system simulation shown that the anti-jamming scheme can improve the ability that DS system combat against narrow-band jamming,and achieve wideband jamming rejection and multiple access interference suppression absolutely.

关 键 词：直扩 收发多天线 抗干扰 叠加扩频 子空间分解 

分 类 号：TN92[电子电信—通信与信息系统]