摘要
纠错编码中解调后对输出信息不判决而直接送给译码器进行译码的方法称为软判决方法,这样得到的信息就是软信息。从信息论的角度分析了软判决和硬判决时的信道容量,通过数学推导得到两种判决方式下信道容量的表达式,简要介绍了卷积码和Turbo码的编译码方法,并将软判决的观点应用于卷积码和Turbo码中。仿真结果表明,在解调器的输出端使用软判决的方法对这两种纠错编码方式来说都可以得到2dB左右的编码增益。
It is called soft decision that information undecided after demodulation and sent to decoder and this kind of information is called soft information in error-correcting codes. The capacity of channel in situations of hard decision and soft decision based on Information Theory was analyzed. The viewpoint of soft decision was used in convolution codes and Turbo codes. And the results indicate that the system can obtain about 2dB encode gains using the way of soft decision instead of hard decision
出处
《系统仿真学报》
EI
CAS
CSCD
北大核心
2008年第17期4763-4766,共4页
Journal of System Simulation
基金
国家自然基金(60572098)
关键词
软判决
信道容量
量化
卷积码
TURBO码
soft decision
capacity of channel
quantization
convolution codes
Turbo codes
