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针对无线光通信脉冲位置调制(PPM)与信道纠错编码的有效结合问题,提出一种大气无线光通信乘积编码PPM新方案。将比特交织和迭代技术引入分组乘积编码PPM中,利用比特交织使信号衰落变得独立,并根据最大似然准则推导得到了弱湍流高斯级联信道下PPM软解调方法,将其与分组码的软输入软输出(SISO)译码算法相结合,进行解调译码的联合迭代。在弱湍流大气条件下仿真及分析表明,方案与独立解调解码的比特交织乘积编码PPM相比,在误码率10-5下有约1dB的增益,且在高码率下可获得优异差错性能,有利于降低系统传输带宽需求并提供高可靠性的信息传输,为纠错编码与PPM的高效联合提供了解决方法。
Aiming at the effective combination of pulse position modulation (PPM) and channel error correction coding in wireless optical communication, a new PPM scheme for atmospheric wireless optical communication product coding is proposed. The bit interleaving and iterative techniques are introduced into PPM, and the signal fading is independent by bit interleaving. According to the maximum likelihood criterion, the soft demodulation method of PPM under the weakly turbulent Gaussian cascade channel is derived, which is compared with the block code Of the soft input soft output (SISO) decoding algorithm combined demodulation decoding joint iteration. Simulation and analysis under weak turbulent atmospheric conditions show that the proposed scheme has a gain of about 1dB at bit error rate 10-5 and excellent error at high bit rate compared with that of bit interleaved product coding of independent demodulation and decoding Performance, help to reduce the system bandwidth requirements and provide high-reliability information transmission, error correction coding and PPM provide an efficient joint solution.