中文摘要：

针对大气湍流易造成激光通信产生长突发错误的问题，研究了低密度奇偶校验（LDPC）编码结合信道交织的差错控制方案。以交织距离作为适应度函数，提出了一种基于遗传算法的交织器设计方案。分析几种交织方式的距离特性表明所设计交织器较分组交织、随机交织和混沌交织具有明显的性能优势。误码率仿真结果也表明，在弱湍流条件下，当误码率为10。时，基于遗传算法的交织器较Logistic映射混沌交织器具有0．5dB的性能优势，而与随机交织器相比，更有0．87dB的性能优势。故该交织器设计方案在大气激光通信中将具有一定的应用价值。

英文摘要：

Because of the problem about long burst error which is caused by turbulence in atmospheric optical communication, a scheme of low-density parity-check （LDPC） code with channel interleaving is investigated. Taking the interleaving distance as fitness function, a design method of interleaver based on genetic algorithm is put forward. According to the analysis of the distance property about some interleavers, the new interleaver has obvious advantages compared with the block interleaver, the random interleaver and the chaotic interleaver. The simulation results show that compared with the random interleaver and the chaotic interleaver ,the interleaver based on genetic algorithm at bit error rate （BER） of 10-5 have more gain 0.5 dB and 0.87 dB under weak turbulence, respectively. Above all, the new design scheme of interleaver will have certain utility in atmospheric optical communication.