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中文摘要：
级联编码是一种提高系统纠错能力以逼近香农限的高效编码方式。当信道编码与空时编码结合使用时性能会大大提升，因此级联空时码研究成为空时编码研究的重要方向之一。笔者介绍了RS码、LDPC码与空时码的级联方案，以及在不同大气湍流条件下的误码率特性，并对其进行了仿真分析。结果表明：级联空时码可以极大地改善大气激光通信系统的性能，抑制大气湍流效应，有利于获得编码增益，进一步改善系统的误码性能。
英文摘要：
Concatenated spacetime code is one of the efficient encoding that can improve the error correction capability and approaching the Shannon limit. The performance will be greatly enhanced when channel coding and spacetime coding combination used, thus the concatenated space- time code becomes one of the important direction in space- time coding research. In this paper, the RS code and LDPC code concatenate scheme with space- time code were introduced, and the bit error rate characteristics under different atmospheric turbulence condition were analyzed. The results show that the concatenated space-time code can significantly improve the performance of the MIMO system, inhibit atmospheric turbulence effects, conducive to obtain coding gain and further more improve the system BER performance.
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