关键词: 认知无线网络, 动态主用户流量模型, 跨层优化, 信道可信度

Abstract: In order to adapt to the scene of primary users traffic’s rapid change and maximize throughput of cognitive users in the case of imperfect spectrum sensing, a cross-layer optimization algorithm of sensing time and source allocation based on centralized Overlay cognitive radio networks is proposed. The optimization objective is decomposed into two sub problems: channel allocation and the joint optimization of sensing time and power allocation. The two sub algorithms are iterative and the optimal solution is obtained. Simulation results indicate that the proposed algorithm is better than single-layer optimal schemes which only consider either spectrum sensing or source allocation and effectively improve the throughput of second users under the premise of fairness.

Key words: cognitive radio network, dynamic primary users traffic model, cross-layer optimization, channel reliability