异步卫星协同通信系统中的双采样差分空时编码方案

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。...

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Vydané v:电信科学 Ročník 33; číslo 11; s. 9 - 16
Hlavný autor: 章坚武;屠贺嘉琦
Médium: Journal Article
Jazyk:Chinese
Vydavateľské údaje: 中国通信学会 01.11.2017
人民邮电出版社有限公司
杭州电子科技大学,浙江杭州,310018
Predmet:
分布式差分空时编码
卫星通信
双采样
异步协同通信
双采样
分布式差分空时编码
异步协同通信
卫星通信
dual-sampling
satellite communication
asynchronous cooperative communication
distributed differential space-time coding
ISSN:1000-0801
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Popis
Shrnutí: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。
Bibliografia:satellite communication, asynchronous cooperative communication, distributed differential space-time coding, dual-sampling
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.
ZHANG Jianwu, TU Hejiaqi（ Hangzhou Dianzi University, Hangzhou 310018, China）
11-2103/TN
ISSN:1000-0801
DOI:10.11959/j.issn.1000-0801.2017309