认知无线电系统中联合优化资源分配算法

在认知无线电系统中,次用户能够利用感知到的已授权频段进行通信,只要其传输过程对主用户通信引起的干扰处于主用户可以忍受的程度之内。协作中继方案能够利用中继节点的传输来有效提高频谱的利用率,并增强了直接链路的传输能力。文中研究在一个三节点的认知无线电网络中基于协作中继传输时的资源分配问题,为了保证在认知用户对主用户干扰可容忍的前提下使得通信系统端到端的可达吞吐量最大,提出了一种联合优化功率分配和信道分配的方案。仿真结果显示,相对于单独进行功率分配或者信道分配情况下该方案能够有效提高认知无线电系统端到端的传输性能。

Resource Allocation Scheme for Cognitive Radio Networks

In the cognitive radio networks(CRNs),the secondary users can exploit sensed frequency band that possessed by the primary users to communicate,as long as the primary user can tolerate the interference caused by transmission.Cooperative relay scheme can use relay nodes to effectively improve spectrum efficiency,and enhance the transmission capacity of the direct link.In this paper,we investigate power and channel allocation for cooperative relay in a three-node cognitive radio network,taking interference control of the primary users into account.In order to maximize throughput of the entire communication system,we propose a joint power and channel allocation scheme.Simulation results show the effectiveness of the proposed scheme compared with the scheme that only use power allocation or channel allocation.