对流层散射通信时间分集技术研究  

Study of the Mechanism of Time Diversity for Troposcatter Communication

作　　者：李志勇[1] 李文铎[1] 

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

出　　处：《无线电工程》2013年第12期17-20,共4页Radio Engineering

摘　　要：针对对流层散射信号的时域衰落特点给出了一种适用于单天线、单发通道和单收通道轻便散射站的新型信号时间分集方法,即将待发送信息符号按等时间间隔多次延迟后重组为一个新的发送序列并共享带宽发出,在接收端对各冗余发送信息进行合并从而获得分集增益。分析了该体制的扩谱隐频率分集作用以及与各种前向纠错编码方法的兼容特性。实测结果表明,在平坦衰落与频率选择性衰落信道中信号的平滑能力均与传统的多天线空间分集体制相当。A novel time diversity method suited for the troposcatter communication system with only one antenna,one input and one output channel was provided according to its fading characteristics in the time domain,which was implemented by delaying the initial symbol sequence in several intervals,re-assembling them into a new sequence,transmitting them in a sharing bandwidth way,and combining all the transmitted redundant information at the receiver to get the diversity gains. The implicit-diversity effect in frequency domain and the compatibility with various FEC codes were analyzed. Test result shows that it is equivalent to the conventional space diversity scheme in order to smooth the deep fading signal either in the case of flat fading channel or frequency-selective fading channel.

关 键 词：时间分集 对流层散射通信 频率分集 瑞利衰落 

分 类 号：TN914.332[电子电信—通信与信息系统]