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异步双卫星MIMO系统中的空时编码方案

DOI: 10.13700/j.bh.1001-5965.2013.0602, PP. 1165-1169

Keywords: 卫星通信系统,多输入多输出,卫星分集,空时码,时间反转

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Abstract:

双卫星多输入多输出(MIMO,Multiple-InputMultiple-Output)系统中不同路径间传播时延的差异会造成接收信号不同步。针对该系统中接收信号不同步问题,提出一种时间反转全码率全分集空时编码方案。该方案中对发送的符号序列进行空时编码后,利用交织改变符号向量发送的时间顺序并对发送数据进行分组。将其中一组数据进行时间反转并插入保护间隔,使接收机在信号不同步的情况下仍然能够获得全码率和全分集增益,同时保留低复杂度最优译码算法的适用性。仿真结果表明,与传统方案相比,提出的空时编码方案能够获得最优的性能。另外,系统采用高阶调制方式或信道条件较差时,该方案的性能增益更大。

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