大气弱湍流信道下松弛极化码译码方法

针对自由空间光通信中存在的大气湍流降低通信系统误码性能的问题,提出了基于松弛极化码的分段式极化码-循环冗余校验-串行抵消列表(PC-CRC-SCL)译码方法,并将其用于自由空间光通信系统中,在大气弱湍流强度下进行了仿真分析。仿真结果表明:与完全极化码的分段式CRC-SCL译码方法相比,在误码率为10-4时,基于松弛极化码的分段式PC-CRC-SCL译码方法获得0.3 dB的编码增益,且编译码的复杂度降低10%~20%,对自由空间光通信系统误码性能有明显的改善。

Decoding method of relaxed polarization code in weak atmospheric turbulence channel

Aiming at the problem that atmospheric turbulence reduces the bit error performance of communication system in free space optical communication,a new decoding method of segmented polarization code cyclic redundancy check serial cancellation list(PC-CRC-SCL)based on relaxed polarization code is proposed.The algorithm is applied to free space optical communication system and simulated under weak atmospheric turbulence intensity.The simulation results show that when the bit error rate is 10-4,compared with the segmented CRC-SCL decoding algorithm of the fully polarized code,the segmented PC-CRC-SCL decoding method based on the relaxed polarizatio code obtains an additional coding gain of 0.3 dB,and the complexity of the polarization code encoding and decoding is reduced by 10%to 20%,and the bit error performance of free space optical communication system is significantly improved.