Abstract：Cooperative transmission for cognitive radio networks not only enhances the anti-fading capability of the system, but also improves the bandwidth efficiency. But it’s really a worth considering issue when the relay node should assit the source node to transmit information. This paper proposes a cooperative guideline based on cooperative level. Firstly the notion of cooperative level is defined, then the expressions of system bandwidth utilization and the average symbol error rate are deduced, finally the system performance function is got through the compromise between the coorperative thresholds and power ratio. This paper also employs particle swarm optimization algorithm to solve optimal cooperative threshold and optimal power ratio. The simulation results verify the performance of the proposed scheme and show that good link state from source node to destination node and cooperative transmission by the relay node are both useful for optimizing the system performance.
张纬良, 郑宝玉, 岳文静. 认知无线电网络中基于协作水平的协作门限与功率联合优化[J]. 电子与信息学报, 2011, 33(10): 2322-2327.
Zhang Wei-Liang, Zheng Bao-Yu, Yue Wen-Jing. Joint Optimization of Cooperative Threshold and Power Based on Cooperation Level in Cognitive Radio Networks. , 2011, 33(10): 2322-2327.
2011, Vol. 33 
