BCH+turbo码在军用光通信系统应用中的性能分析

Performance analysis of SCCC based on BCH and turbo codes in military optical communication system

对应用于光通信系统的原始turbo码提出了改进方案:用BCH码做外码、turbo码做内码组成一种新的串行级联卷积码(SCCC).提出了相应的全面迭代最大后验概率(MAP)译码算法.推导了级联码的不可检测错误概率.对SCCC码的误码率进行了仿真,仿真结果表明,SCCC码在高信噪比时降低了通信系统的误码率,可适用于军用光通信系统.

A serial concatenated convolutional code (SCCC) that consists of the BCH code and turbo code is proposed as an improvement on turbo code applied in the military optical communication. The BCH code serves as the outer code while the turbo code serves as the inner code. A corresponding (over-all MAP) decoding algorithm is put forward. A formula of undetectable error probability is (deduced.) A simulation of bit error rate (BER) of (SCCC) is done. The result of simulation shows that SCCC reduces the bit error rate (BER) on the high signal-to-noise ratio (SNR), and it can be used for the military optical communication system.