协同无线网络中感知传输时间分配与功率控制的联合优化

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.

Joint Optimization with Sensing-Transmission Time Allocation and Power Control for Cooperative Wireless Network

Joint optimization assisted by the time and power allocation of spectrum sensing and data transmission is a new paradigm for cooperative wireless network.By taking full account of different cognitive user’s transmit power over channels and their mis-detection/false alarm probability of licensed users,a new joint optimization scheme with amplify-and-forward mode based on system energy-efficiency maximization is proposed for sensing-transmission time allocation and power control.It is proven that the global optimal solution of this scheme can be tractable by sequential optimization method.Simulation shows that the energy-efficiency of the relay-assisted transmission using our proposed scheme outperforms the non-relay transmission,and the system performance will be improved with sensing-transmission ratio decrement and signal-to-noise ratio of the licensed user increment.