机会中继与多中继多接收天线协作系统的性能比较

机会中继与多中继多接收天线协作系统的性能比较

内容简介：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。

Abstract：In this paper, we analyzed and compared the system performance of opportunistic and multiple relaying based on cooperative communication. When discussing multiple relaying, we considered two kinds of power allocation schemes: equal power allocation and optimal power allocation among relay nodes. When comparing performance of those two schemes, we also considered the following scenarios:single antenna and multiple antennas at the destination. In the case of multiple antennas at the destination, we use optimal power allocation algorithm to select the best relay node for opportunistic relaying. By theoretical analysis and Monte Carlo simulation comparison, performance of multiple relaying under the scenario of multiple antennas at the destination outperforms opportunistic relaying. The result is opposite from the scenario of single antenna at the destination.

作者：刘伟, 啜钢, 夏宗友,

关键词：协作通信, 机会中继, 多中继, 最优功率分配, 虚拟MIMO,