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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。
Cascade coding is an efficient coding method that improves the system’s error correction ability to approach Shannon’s limit. When channel coding and space-time coding are used in combination, the performance will be greatly improved. Therefore, the research on cascaded space-time coding becomes one of the important directions in space-time coding. The author introduces the cascade scheme of RS code, LDPC code and space-time code, as well as the error rate characteristics under different atmosphere turbulence conditions, and carries on the simulation analysis. The results show that cascaded space-time code can greatly improve the performance of atmospheric laser communication system, restrain the atmospheric turbulence, facilitate the gain of coding and further improve the error performance of the system.