多用户协作和中继的性能分析与比较

Performance Comparison of Multi-User and Multi-Relay Cooperation

以蜂窝网的下行线路为例,描述了不采用协作、多用户协作、基于最优用户选择的多用户协作、多中继协作和基于最优中继选择的多中继协作等五种模式的具体场景和时隙分配示意图,给出了五种模式下的基站和目的用户之间的互信息和一帧内所消耗的总能量。对五种模式下中断概率进行了数值仿真。理论分析和仿真结果表明,多用户协作能获得较大的分集增益,而多中继协作的能量效率较高。信噪比受限条件下,无论多用户协作还是多中继协作,采用协作选择技术后,能量效率更高。

With the downlink of cellular network as a instance,the scenarios and the time-slot assignments schematic diagram in five patterns as with no cooperation,multi-user cooperation,multi-user cooperation based on the selection of optimal user,multi-relay cooperation and multi-relay cooperation based on the selection of optimal relay are described.The mutual information between the base-station and the desired user,and the total energy consumed within a frame of different patterns are given.The outage probability of different patterns are simulated.The theoretical analysis and numerical simulation reveal that the multi-user cooperation could achieve higher diversity gain while the energy efficiency of multi-relay cooperation is higher.Under the SNR constraint,both multi-user cooperation and multi-relay cooperation,with the selection technology of cooperation,could achieve higher energy efficiency.