摘要
在没有直传链路的AF-MIMO协作通信系统中,针对节点发送功率和转发功率未知情况下的最佳中继选择问题,提出了一种机会中继选择算法。该算法通过理论分析和数学推导,分别研究了协作中继数目和系统各部分的功率分配对信道容量的影响,并依据瞬时信道信息推导出简易判别式,利用最大-最小化准则选择出最佳中继,在没有增大算法复杂度的同时提升了系统信道容量。仿真结果表明,该算法选择出的最佳中继在信道容量性能方面较已有算法有一定提高,验证了所提选择算法的有效性。
Under the condition that transmission power and relay power of the nodes are unknown, an opportunistic relay selection algorithm is proposed to solve the problem of best relay selection in AFMIMO cooperative communication system without direction link. By theoretical analysis and mathematical derivation, the effects of the number of cooperative relays and the power allocation in each part of the system on the channel capacity are investigated. A simple criterion is derived using the instantaneous channel state information and the best relay is selected in terms of the maximin criterion, which improves the overall channel capacity without increasing the computation complexity. Simulation results show that, the relays selected using the proposed algorithm can significantly improve the channel capacity, ahich confirms the effectiveness of the proposed algorithm.
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2014年第6期1818-1824,共7页
Journal of Jilin University:Engineering and Technology Edition
基金
国家自然科学基金项目(60972072
61340033)
高等学校学科创新引智计划项目(B08038)
关键词
通信技术
机会中继选择
信道容量
瞬时信道信息
协作通信
communication
opportunistic relay selection
channel capacity
instantaneous channel state information
cooperative communication
