认知无线电中基于中继位置和主用户位置的功率分配  

Power Allocation Based on Relay Location and PU Location for CR Network

作　　者：陈凤蝶 杨守义[1] 宁冰[1] 李广平[1] 

机构地区：[1]郑州大学信息工程学院,郑州450001

出　　处：《电信科学》2015年第8期84-90,共7页Telecommunications Science

基　　金：国家自然科学基金资助项目(No.61271421)~~

摘　　要：针对认知无线电网络,提出了一种基于组间协作的联合直接传输和协作传输的传输机制,在满足干扰约束和峰值功率约束的情况下,通过分析瑞利衰落环境下放大转发协作单中继系统的性能,研究了中继位置和主用户位置对于系统的最优功率分配和系统吞吐量的影响,并对最优功率分配方案和等功率分配方案的性能进行了比较。仿真结果表明,中继位置和主用户的位置对于系统性能起着关键的作用,最优功率分配方案取得相对于等功率分配方案更优的性能,采用最优功率分配方案时,中继节点位于源节点和目的节点连线的中点且靠近认知用户时的系统性能最优。A new transmission mechanism called direct and relay-aided transmissions based on inter group cooperation was proposed for the cognitive radio network. The performance of a single-relay system based on amplify-forward in the Rayleigh fading environment by considering the interference constraints and peak power constraints was analyzed. The impact of the relay node and the primary users （PU） location on power allocation and system throughout was investigated and the performance of the optimal power allocation （OPA） scheme and equal power allocation （EPA） scheme was compared. The result shows that the locations of relay node and PU are crucial to the system performance and the proposal optimum power allocation scheme significantly outperforms the equal power allocation scheme. The best performance was achieved when the relay is at an equal distance from the sender and the destination in EPA scheme or the relay is closer to the destination around in OPA scheme.

关 键 词：认知无线电网络 功率分配 中继位置 直接传输和协作传输 

分 类 号：TN929.533[电子电信—通信与信息系统]