基于LDPC编码的协作HARQ对数似然比加权合并方法  

LDPC Code-based Cooperative HARQ Combining Scheme with Weighted LLR

作　　者：邢春霄 曾桂根[2] 

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003 [2]南京邮电大学信号处理与传输研究院,江苏南京210003

出　　处：《南京邮电大学学报（自然科学版）》2014年第3期36-41,共6页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：江苏省科技支撑计划(工业)(BE2012182)资助项目

摘　　要：协作混合自动重传请求(Hybrid Automatic Repeat Request,HARQ)机制选择信道状况最优的中继节点来执行重传,比传统HARQ更能适应无线信道的变化。为了同时解决HARQ合并方法的性能和适用性问题,提出了一种对数似然比加权合并译码方法,将各次接收信号的对应比特对数似然比按信道频域冲激响应功率进行加权合并译码,能显著降低系统误码率。仿真结果表明,对数似然比加权合并方法具有逼近最大比合并算法的性能,存储开销和计算复杂度相当,可以灵活用于各种类型的HARQ系统。The cooperative hybrid-automatic repeat request （HARQ） scheme selects the optimal relay to retransmit packets,and adapts better to the changing of wireless channel than the traditional HARQ.To combat the problems of the decoding performance and the applicability of the HARQ combining scheme,a weighted log-likelihood ratio （LLR）-based method is proposed,in which the LLR of corresponding bit for each received signal is weighted and combined to decode according to the channel impulse power in the frequency domain.It is efficient to degrade the bit error rate of the system.Simulation results show that the proposed method can achieve the performance approching to that of maximal-ratio combining algorithm in terms of similar storage and computation complexity,thus it is feasible for different HARQ systems.

关 键 词：OFDM LDPC 协作HARQ 对数似然比 分集合并 

分 类 号：TN911.22[电子电信—通信与信息系统]