认知无线电网络信道选择机制

Channel Selection Mechanism in Cognitive Radio Networks

认知无线电网络通过动态频谱接入来提高无线频谱资源利用率,而节点目标信道选择的优劣直接决定了频谱接入性能的好坏.本文首先综合考虑信道增益和空闲时间两种因素,设计以实现最大化系统容量的目标信道选择机制,然后引入信道热度概念,提出一种多属性决策信道选择机制.仿真结果表明,多属性决策信道选择机制在系统吞吐量和频谱利用率性能上都有明显的提高.

To improve the utilization of wireless spectrum resource, the dynamic spectrum access is used in the cognitive radio network. However, the advantages and disadvantages of Node target channel selection directly determine the spectrum access performance. Firstly, by comprehensively considering the two factors of the channel gain and spare time, this paper designs a channel selection mechanism so as to realize the goal of maximizing the system throughput. Then this paper introduces the concept of channel heat and puts forward a channel selection mechanism based on multiple attribute decision. The simulation results indicate that channel selection mechanism based on multiple attribute decision apparently improves the system throughput and spectrum utilization performance.