基于LDPC-OFDM系统的短波多基地接收协作算法

基于LDPC-OFDM系统设计了适用于短波信道的多基地接收协作算法,该算法提出了基于概率测度的信息合并的LDPC协同译码策略。系统模型中的中心台,利用其接收的来自中继台的多路信号来修正其接收到信息的初始化消息,将协作通信技术和LDPC的迭代译码有机地结合,从而有效地实现分集增益和编码增益。仿真表明,多基地接收方案相对于直接传输策略具有显著的性能提高,在误码率达到10_-3时,DF转发策略的译码性能相对于AF的译码性能约有0.7dB的编码增益。

A multi-base station cooperative algorithm for LDPC-OFDM system in the HF channel

Based on LDPC-OFDM system, a multi-base station cooperative algorithm is designed for high frequency (HF) channel, and a LDPC cooperative decoding algorithm is proposed, which adopts information combing based on the probability measure. The center station in the system model adopts the multiple signals received from the relay station to update the initialization information it receives. This can combine the collaboration communication technology with LDPC iterative decoding effectively, and achieve the diversity gain and coding gain. Simulation results show that the multi-relay base cooperative strategy has better performance in the bit error rate than direct transmission strategy. The decoding performance of DF forwarding strategy with a relay station with respect to that of AF forwarding strategy has a gain of about 0.7dB at BER=10-3.