异步卫星协同通信系统中的双采样差分空时编码方案  

Dual-sample differential space-time coding scheme in asynchronous satellite cooperative communication system

作　　者：章坚武[1] 屠贺嘉琦 

机构地区：[1]杭州电子科技大学,浙江杭州310018

出　　处：《电信科学》2017年第11期9-16,共8页Telecommunications Science

基　　金：国家自然科学基金资助项目(No.61471152);浙江省自然科学基金资助项目(No.LZ14F010003)~~

摘　　要：针对双卫星中继协作通信系统中存在非符号周期整数倍的时延差问题,提出了一种双采样的差分空时正交频分复用(D-OFDM2)方案。所提方案在卫星信道条件未知的情况下,基于具有时延容忍的D-OFDM编码,在接收端构造了一种双采样方法。该方法在以符号速率采样的同时,对当前主瓣大于相邻旁瓣的区间内增加一次采样,并将两次采样结果等增益合并。仿真结果表明,在系统时延差为非符号周期整数倍的情况下,该方法较单采样方法能获得更高的接收信噪比,同时改善了系统误码性能。Focusing on asynchronization in relay communication system over satellite fading channels, a dual-sampling differential space-time orthogonal frequency division multiplex（D-OFDM2）coding scheme was proposed. The proposed scheme constructed a dual-sampling method at the receiver based on the D-OFDM coding with delay tolerance when the satellite channel condition was unknown. The method added another sample to the current main lobe interval and equal gain merge the two sampling results. Comparing with the traditional scheme when the fractional delay is present, the D-OFDM2 scheme can obtain higher signal-to-noise ratio than single sampling method, and improves the system error performance.

关 键 词：卫星通信 异步协同通信 分布式差分空时编码 双采样 

分 类 号：TN927[电子电信—通信与信息系统]