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针对协同无线网络中频谱感知和数据传输两阶段的时间分配及功率优化问题,在充分考虑认知用户在各个信道上的不同传输功率及其对授权用户出现概率的误检或漏检的基础上,提出了放大转发模式下基于最大化系统传输能效的感知传输时间分配和功率控制联合优化方案,并证明了该方案可以通过序列优化的方法来获得其全局最优解.仿真结果表明,协作中继传输方式下所获得的系统传输能效明显优于非中继传输方式,且随着感知传输时间分配比率的减小和授权用户信噪比的增加,系统性能将得到进一步提高.
Aiming at the two phases of spectrum allocation and data transmission in collaborative wireless networks, the time allocation and power optimization problems are fully considered based on the different transmission power of cognitive users on different channels and their false positive or negative detection on the probability of authorized users , Proposed a joint optimization scheme of perceptual transmission time distribution and power control based on maximizing system energy efficiency in amplification and forwarding mode and proved that this scheme can obtain its global optimal solution by means of sequence optimization.The simulation results show that in collaborative The energy efficiency of the system transmission obtained after the transmission mode is obviously better than that of the non-relay transmission mode, and the performance of the system will be further improved with the decrease of the transmission ratio and the signal to noise ratio of authorized users.