不等保护码在CBTC系统中的应用

Application of UEP Code in Communication-Based Train Control System

针对轨道交通车地通信中信息对误码敏感程度不同的现象,提出利用不等保护码作为信道编码方案,为基于通信的列车控制(CBTC)系统重要信息提供更好的误码保护。采用分离最小理想的方法给出R-S码空间的构造方法,提出一种适用于具有2个保护能力等级的R-S码的译码算法——二次译码算法。仿真显示,不等保护码可以使高保护等级信息位的信噪比降低0.5 dB以上。

Considering the different sensitivities for bit errors of the information in Communication-Based Train Control（CBTC） system, this paper proposes a new error-correcting code for the more important information, which is R-S Unequal Error Protection（UEP） code. The algorithm constructs the code space by separating the minimum ideal, and a new decoding algorithm for R-S UEP codes which have two error protection levels are two is proposed. Simulation show that R-S UEP code makes the SNR of the information with high-level protection reduce by 0.5 dB at least.