散射通信中多进制正交扩频的性能分析  

Performance Analysis on M-ary Orthogonal Spread Spectrum System in Troposcatter Communication

作　　者：张会珂 徐松毅[1] 杨志芳[2] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]中航工业石家庄飞机工业有限责任公司,河北石家庄051430

出　　处：《无线电工程》2015年第2期73-76,共4页Radio Engineering

基　　金：国家部委基金资助项目

摘　　要：针对散射远距离通信时传输损耗大的问题,采用多进制正交扩频技术。给出了系统发射、接收模型,仿真了AWGN信道下几种不同进制的误码率曲线并与理论误码率曲线进行了对比。推导了瑞利衰落信道下的误码率公式,在低速散射衰落信道下对16进制正交扩频系统进行了仿真,验证了公式的正确性,并分析了最大多普勒频移对系统的影响。给出了两重、四重分集下的系统性能。通过与传统直扩系统的性能对比,进一步说明将多进制正交扩频与时间分集技术相结合,应用到低速散射通信系统中可以提高系统性能。To solve the problem of big transmission loss in remote communication,the M-ary orthogonal spread spectrum is put to use-The transmitter and receiver models are given-Several bit error rate curves for different-ary in the AWGN channel are simulated and compared with theory bit error rate curves-The formula of bit error rate in rayleigh fading channel are derived-Furthermore,the hexadecimal orthogonal spread spectrum system in the low-speed rayleigh fading channel is simulated,which is verified correctly by comparison with the formula-And the effect of max Doppler frequency shift on the system performance is analyzed-Finally,the system performance with double diversity and that with quadruple diversity are discussed-Compared with the traditional DSSS system,the results show that the application of M-ary orthogonal spread spectrum with time diversity technology to the low-speed troposcatter communication can im-prove the performance of system.

关 键 词：多进制 正交扩频 时间分集 散射通信 非相干检测 

分 类 号：TN911[电子电信—通信与信息系统]