为了优化多节点放大转发协作通信系统的性能,对系统误符号率(SER)进行了深入研究,提出一种在高、低信噪比(SNR)情况下均紧于理论值的SER下界.在满足SER最小准则情况下,以下界为依据,提出适用于多节点协作通信系统最优功率分配与协作伙伴选择方案.在系统总功率受限情况下,基于该方案的SER性能明显优于基于平均功率分配方案的性能.与现有功率分配方案相比,在低SNR情况下,基于该方案的SER性能较紧于理论值.同时,该方案实现了协作伙伴选择功能.
The symbol error rate (SER) performance is analyzed for the optimization of amplify-and-forward multi-node cooperative communication systems. Firstly, theory SER is analyzed for the systems. Then, the corresponding low bound (LB) is derived, that will be nearing the theory SER between both low and high signal-to-noise ratio conditions. Finally, algorithms used in optimal power allocation (OPA) and partnership selection for the systems by exploring the LB as cost function are formulated. Theoretical analysis and simulation results show that the OPA outperforms traditional equal power allocation in SER performance. Moreover, the LB will be more nearing the theory SER than existing algorithms especially under low SNR conditions.