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为了提高宽带认知无线电的吞吐量,提出了能量检测时间和子信道传输功率的联合分配.针对认知无线电的传输帧结构,联合分配被建立成关于时间和功率的多变量优化问题,即在保证各子信道的虚警概率、检测概率及总功率满足需求的基础上,最大化认知无线电的吞吐量.通过采用二分搜索算法和交替方向优化算法,获得了优化问题的最优解.联合分配属于凸优化问题,因此存在特定的时间和功率,最大化认知无线电的吞吐量.实验结果表明:在瑞利衰落信道下,相比感知———吞吐量折中方案,联合分配能够提高认知无线电的吞吐量.
In order to improve the throughput of wideband cognitive radio, a joint allocation of energy detection time and sub-channel transmission power is proposed.For the transmission frame structure of cognitive radio, joint allocation is established as multivariable optimization problem about time and power, The sub-channel false alarm probability, detection probability and total power to meet the demand based on the maximum cognitive radio throughput.By using binary search algorithm and alternating direction optimization algorithm, the optimal solution to the problem is obtained. Which belongs to the convex optimization problem, so there is a certain time and power to maximize the throughput of cognitive radio.Experimental results show that under the Rayleigh fading channel, the joint allocation can improve the cognitive performance compared with the throughput-compromise scheme Know the radio throughput.