摘要： 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。
关键词:
不等保护码,
译码算法,
基于通信的列车控制系统
Abstract: 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.
Key words:
Unequal Error Protection(UEP) code,
decoding algorithm,
Communication-Based Train Control(CBTC) system
中图分类号:
毛 倩;徐伯庆;曾小清. 不等保护码在CBTC系统中的应用[J]. 计算机工程, 2009, 35(19): 268-271.
MAO Qian; XU Bo-qing; ZENG Xiao-qing. Application of UEP Code in Communication-Based Train Control System[J]. Computer Engineering, 2009, 35(19): 268-271.