基于OFDM技术的软比特解码系统  

OFDM-based Soft Bit Decoding System

作　　者：徐永键[1] 陆许明[1] 龙光平 谭洪舟[1] 

机构地区：[1]中山大学,广东广州510800 [2]东莞中山大学研究院,广东东莞523808

出　　处：《通信技术》2014年第9期999-1003,共5页Communications Technology

基　　金：广东省教育部科技部产学研结合项目(科技创新平台建设专项)(No.2012B090600009);东莞中山大学研究院联合研发产业项目(No.201202B3-0300)~~

摘　　要：提出了基于OFDM基带系统的软比特译码方法,该方法以Viterbi软比特译码为中心,改善传统OFDM基带系统接收端的解映射、解交织、解删余模块,使得各个模块兼容软比特判决。软判决采用3比特的量化作为数据处理单位,提高Viterbi译码的性能。该方法从解映射模块入手,将接收到的数据信号解映射为3比特量化数据,送入改进后兼容3比特量化数据的解交织模块和解删余模块。实验结果表明,对比硬比特解码,所提出的软比特解码系统在性能上有很大的提升。A method based on soft bit decoding method of OFDM baseband system is proposed. This meth-od takes the Viterbi decoding soft bit as the center part, thus to improve the demapping module, deinter-leaving module and depuncturing module at the receiving terminal of the traditional OFDM baseband sys-tem. This solution makes each module compatible with soft bit decision which uses 3-bit quantization unit as the data processing units to improve the performance of Viterbi decoding. The method, from the per-spective of the demapping module, demaps the received data signal for 3-bit quantized data. Then the quantitative data is put into the deinterleaving module and depuncturing module, which are improved to be compatible with 3-bit quantized data. The experimental results show that, compared to hard bit decoding, the soft bit decoding system has a great improvement in its performance.

关 键 词：正交频分复用基带系统 软比特译码 维特比译码 

分 类 号：TN911.23[电子电信—通信与信息系统]