认知无线电中基于多属性判决的目标切换信道选择

Study on handover channel selection in cognitive radio based on multiattribute making decision

认知无线电通过频谱切换来提高无线频谱利用率,因此切换时目标信道的选择对系统性能的影响至关重要。针对该问题根据多属性判决模型中的简单加权法创造性提出两级选择机制,并结合业务分级的思想利用几何平均法计算出相应的属性权重。与首次匹配法进行了比较,仿真结果表明:该方法选择的目标信道的延迟明显降低,频谱利用率和误码率也明显提高。

Cognitive radio can improve the wireless spectrum utilization by spectrum handover,therefore,the choice of target channel while spectrum handover is essential for system performance.Based on Simple Additive Weigh（tSAW） in multi-attribute making decision model,this paper brings forward two-decision mechanism creatively.Moreover,combined with the thought of classification,the paper uses geometric mean method to calculate the corresponding attribute weights.Compared with first-time matching method,simulation results show that the proposed method can distinctly reduce the delay of the handover channel,significantly improve spectrum utilization as well as bit error rate.