异步卫星协同通信系统中的双采样差分空时编码方案

doi:10.11959/j.issn.1000-0801.2017309

电信科学 ›› 2017, Vol. 33 ›› Issue (11): 9-16.doi: 10.11959/j.issn.1000-0801.2017309

异步卫星协同通信系统中的双采样差分空时编码方案

章坚武,屠贺嘉琦

杭州电子科技大学，浙江杭州 310018

修回日期:2017-11-10 出版日期:2017-11-01 发布日期:2017-12-08
作者简介:章坚武（1961-），男，杭州电子科技大学通信工程学院教授、博士生导师，主要研究方向为移动通信系统、多媒体通信技术、网络安全等。|屠贺嘉琦（1992-），男，杭州电子科技大学通信工程学院硕士生，主要研究方向为移动通信系统。
基金资助:
国家自然科学基金资助项目(61471152);浙江省自然科学基金资助项目(LZ14F010003)

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

Jianwu ZHANG,Hejiaqi TU

Hangzhou Dianzi University,Hangzhou 310018,China

Revised:2017-11-10 Online:2017-11-01 Published:2017-12-08
Supported by:
The National Natural Science Foundation of China(61471152);Zhejiang Provincial Natural Science Foundation of China(LZ14F010003)

摘要/Abstract

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。

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

Abstract:

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.

Key words: satellite communication, asynchronous cooperative communication, distributed differential space-time coding, dual-sampling

中图分类号:

TN927

章坚武,屠贺嘉琦. 异步卫星协同通信系统中的双采样差分空时编码方案[J]. 电信科学, 2017, 33(11): 9-16.

Jianwu ZHANG,Hejiaqi TU. Dual-sample differential space-time coding scheme in asynchronous satellite cooperative communication system[J]. Telecommunications Science, 2017, 33(11): 9-16.

图/表 9

图1

表1

中继对信号的处理"

时隙	中继1	中继2
时隙1	$V_{1,1} [m] = A Z_{1,1} [m]$	$V_{2,1} = - A Z_{2,2}^{*} [{〈 - m 〉}_{N}]$
时隙2	$V_{1,2} [m] = A Z_{1, 2} [m]$	$V_{2,2} = A Z_{2,1}^{*} [{〈 - m 〉}_{N}]$

表1

图2

图3

图4

图5

图6

图7

图8

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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

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