一种新的网络信道编码中继协作方案

Novel network-channel coding scheme for relay cooperation

利用网络与信道结合编码,提出了一种高阶分集增益的中继协作方案。该方案在中继节点处将多个时刻接收的信息分别进行信道编码,再将所有码字进行网络编码后转发。目的节点采用迭代最大后验概率译码,利用多个时刻收到的码字恢复源节点发送信息。对瑞利衰落信道下成对错误概率的分析表明,本文方案可使源节点发送信息在不同时刻得到多次转发,从而增加时间分集增益。仿真结果表明,本文方案在快衰落和慢衰落信道下均能提高系统分集增益,并且随着中继节点接收信噪比的提升,系统性能明显改善。

A high-order diversity scheme is proposed for relay cooperation by using network channel coding approach. The information received by the relay node in different time is coded with a channel coding method. Then all the codes are forwarded after network coding. Using iterative and maximum a posteriori decoding method, the information can be obtained at the destination node by decoding the codes received in different time. The pairwise error probability analysis under Rayleigh fading channel shows that the proposed scheme can increase time diversity gain by forwarding the information several times at source node in different time slots. Simulation results show that the scheme can obtain higher diversity gain in both fast and slow fading channels. Furthermore, the performance can be improved as the received signal to noise ratio of the relay node increases.