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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10-5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。
Aiming at the problem that the atmospheric turbulence can easily lead to long burst errors in laser communication, an error control scheme of low density parity check (LDPC) coding combined with channel interleaving is studied. Taking the interleaving distance as a fitness function, a design scheme of interleaver based on genetic algorithm is proposed. Analyzing the distance characteristics of several interleaving methods shows that the designed interleaver has better performance than packet interleaving, random interleaving and chaos interleaving. BER simulation results also show that in the weak turbulence conditions, when the BER is 10-5, the genetic algorithm-based interleaver has a 0.5dB performance advantage over the Logistic-mapped chaotic interleaver, while compared with the random interleaver , More performance advantage of 0.87dB. Therefore, the interleaver design in atmospheric laser communications will have a certain value.