干扰受限的机会中继选择协作通信

摘要

The communication performance of opportunistic relay selection cooperative com-munication under the condition of Nakagami/I.I.D.Nakagami interference limited and total network power constraint is studied.In addition to the influence of noise,shadow and fading,there is also the existence that the transmitted desired signal is interfered by other user sig-nals from the same frequency band which is called co-channel interference(CCI).When the number of users is increasing,a large number of co-frequency interference will replace noise and become the main constraint factor of wireless communication quality.In this case,the wireless communication environment will change from noise-limited environment to interfer-ence limited.Theoretical analysis and simulation results show that,the opportunistic relay selection cooperative communication in the interference limited environment can achieve di-versity gain and resist the influence of co-channel interference through the cooperation be-tween nodes.The communication performance can be further improved by reasonable power allocation.%研究了全网总功率约束条件下机会中继选择协作通信在Nakagami/I.I.D.Nakagami干扰受限环境下的通信性能.实际中的无线信号除了会受到噪声、阴影和衰落的影响外,还存在传输的期望信号受到来自于相同频带内的其它用户信号的干扰,称之为共道干扰.当用户数不断增加时,大量的同频干扰将取代噪声,成为无线通信质量的主要约束因素,这时的无线通信环境将由噪声受限环境变为干扰受限.理论分析和仿真结果表明,在干扰受限环境下的机会中继选择协作通信通过节点间相互协作,实现分集增益和减小共道干扰的影响,通过合理的功率分配可以进一步提升协作通信性能.