无线光通信编码调制中交织器设计研究

Research on Interlveaver Design for Bit-interleaved Coded Modulation in Wireless Free Space Optical Communication

交织设计是无线光比特交织编码调制通信系统抗衰落能力的一个影响因素。在构建系统模型基础上,给出了交织器优化设计的基本原则及其数学模型,对伪随机交织、S随机交织和改进黄金分割交织的距离特性及其在弱湍流条件下的性能进行了仿真分析。结果表明,交织可有效提高编码调制的差错性能,对于给定交织方式,增加交织长度可获得更好改善,当交织长度一定时,基于距离特性设计的交织器能够提供更好性能。

The interleaver is an influential factor for the anti-decline ability of bit-interlveaved coded modulation （BICM）in free space optical communication （ FSO ）. After the FSO BICM communication system model is introduced, the design rules of interleaver and its mathematical expressions are given, the distance property of Pseudo-random interleaver, S-random interleaver and imporved golden interleaver, as well as their performance under weak turbulence are analyzed by simulations. The results show that the interleaver can improve the performance of coded modulation efficiently, the given interleave pattern and added interleaving length further, and the interleaver based on characteristic design can provide better performance in some interleaving length.