【摘要】 为了提高单播链路的重传效率,发射端采用网络编码将多个重传数据流的增量冗余版本经过合并后再传输给接收端.基于置信传播(BP)算法,接收端从经过网络编码的组合数据流中检测出各个重传数据流,并和在前次传输时缓存的数据流软合并后译码.此外,再用BP算法将先译码成功的数据流从组合数据流中消除,以提高未成功译码数据流的检测性能.和单播链路上传统的多数据流独立自动请求重传(ARQ)相比,多数据流联合ARQ能够将单播链路的频谱效率提高大约10%,而仅导致低于22%的复杂度增加.更多还原

【Abstract】 The usage of the unicast wireless link is improved via combining the incremental redundancy versions of multiple data streams,which are requested for retransmission.Before channel decoding,retransmission data streams are respectively detected from the composite stream by the belief propagation(BP) algorithm and combined with soft information buffered at the receiver during the previous transmission phase.Moreover,by the BP algorithm,the correctly recovered data streams are cancelled from the composite stream to improve the detection performance of other erroneous streams.For multi-stream transmission over the unicast wireless link,compared with the traditional automatic repeat request(ARQ) scheme,about 10% spectrum efficiency gain can be obtained by the proposed multi-stream ARQ.Meanwhile,the complexity increase is less than 22%.更多还原