适用于无线双向中继信道的机会协作网络编码

Opportunistic Cooperative Network-Coding for Wireless Two-Way Relay Channel

提出的一种机会协作网络编码(OCNC),将协作分集技术和网络编码技术有机结合,能克服无线信道衰落,提高系统资源利用率和网络吞吐.针对无线双向中继信道中端到端信息交换的情形,分别分析了3步、2步OCNC的误比特率(BER)性能和获取的网络编码增益,结果表明,相对于传统的数据交换方案,3步、2步机会协作网络编码在获得全分集(获得的分集阶数为参与协作的节点数)的同时,也分别获得了4/3倍和2倍的渐近网络编码增益,由于多个协作节点的机会中继,OCNC的网络编码增益在中间信噪比(SNR)区域更为突出.

An opportunistic cooperative network-coding scheme based on space-time coding （OCNC） is proposed for combining channel fading and improving resource efficiency and network throughput. Fo- cusing on the bi-directional traffic flows in wireless cooperative relaying network, the OCNC schemes, termed as 3-step and 2-step schemes respectively is grouped, and their bit error probabilities and the network-coding gain is developed and analyzed. The numerical results show that, in contrast to traditional scheme, a full diversity （i. e. K-order diversity in case of K relay nodes） is achieved by both OCNC schemes and asymptotical 4/3 and 2 times of network-coding gain are obtained by 3-step and 2- step OCNC schemes respectively. In addition, because of opportunistic relaying of multiple nodes, the network-coding gain of OCNC is more considerable in the medium signal-to-noise ratio （SNR） range.