多中继选择极化译码转发及优化功率分配

Multi-Relay Selective Polar Decoding and Forwarding and Optimized Power Allocation

为了解决多卫星协作空间通信网络的高误码、低信息传输成功率等问题,提出了多中继节点选择极化译码转发及其优化功率分配方案.它主要采用了信道统计特性的多中继选择译码转发、最优中继节点选择及相应的优化功率分配方案.最优中继节点选择及功率分配方案在协作阈值设置较低情况下,其中断性能和复杂度优于多中继选择译码转发方案.仿真表明:当误码率为10;时,采用所提极化码-最优中继方案,相对于现有极化码协作方案及低密度奇偶校验(Low Density Parity Check,LDPC)码协作方案,分别提高了约0.6 dB和0.8 dB性能增益.故该方案可有效用于卫星协作的星地融合无线传输通信网络.

To solve problems of high code error and low information transmission success probability of space communication networks with multi-satellite cooperation,multi-relay selective polar decoding and forwarding and optimized power allocation are proposed.Multi-relay selection decoding and forwarding with channel statistics characteristics,optimal relay node selection and corresponding power allocation are proposed,respectively.The optimal relay node selection and power allocation scheme have better outage performance and complexity than those of the multi-relay selection decoding and forwarding scheme,when the cooperative threshold is set low.Simulation results show that at bit error rate of 10;,the proposed polar code-optimal relay scheme obtains by about 0.6 dB and 0.8 dB performance gains,when compared with those of the existing polar coded cooperation scheme and LDPC(Low Density Parity Check)code cooperation scheme.Therefore,it can be effectively used in satellite-to-ground fusion wireless transmission communication networks with satellite cooperation.