基于OFDM技术的软比特解码系统

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。

OFDM-based Soft Bit Decoding System

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.