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本文对协作通信中采用机会中继和多中继两种方案下的系统性能进行了分析比较,在讨论多中继时考虑了中继节点间平均分配发射功率和根据最优原理分配发射功率这两种功率分配方式。对比两者性能时,考虑了接收端是多天线情况,并且在讨论接收端是多天线情况下的机会中继时,采用的是最优功率分配算法来选取最优中继节点。通过理论分析结合蒙特卡罗仿真对比,得到协作系统采取机会中继和多中继这两种中继方案下,多中继方案的系统性能优于机会中继方案,这与当接收端是单天线时,机会中继要好于多中继的性能结论[1]正好相反。
In this paper, we analyze and compare the system performance under the two schemes of opportunistic relay and multi-relay in cooperative communication. In the discussion of multi-relay, we consider the average allocation of transmit power between relay nodes and the allocation of transmit power according to the optimal principle. Two power distribution methods. Comparing the performance of the two, considering the receiver is a multi-antenna case, and in discussing the opportunistic relay when the receiver is multi-antenna, the optimal power allocation algorithm is adopted to select the best relay node. By theoretical analysis combined with Monte Carlo simulation, we can get the system performance of multi-relay scheme is better than that of opportunistic relay scheme when the cooperative system adopts both opportunistic relay and multi-relay. This is the same as when the receiver is single Antenna, the opportunity relay is better than multi-relay performance Conclusion [1] the opposite.