多用户全双工无线携能系统中的波束赋形研究

Research on beamforming design for multi-user full-duplex SWIPT systems

针对多用户全双工蜂窝通信系统,提出了一种基于功耗最小及能量收获最大双目标准则的联合优化方案。该方案采用迫零消除上行链路中多用户干扰,在下行链路,为了实现信息和能量的有效传递,全双工基站分别采用信息波束赋形及能量波束赋形为用户提供通信服务,在保证用户的服务质量及功率约束的同时,实现了功率效率和频谱效率的同步改善。由于功率问题为非凸问题,通过半定松弛将其转化为凸优化问题。仿真结果表明,所提方案相比传统方案能够节约大量的功率,此外全双工基站通过能量波束赋形向下行用户传递能量,有效提高了系统的功率效率。

A joint optimization scheme based on the dual goals which are the minimization of the power consumption and the maximization of the energy harvest was proposed for the multi-user full-duplex( FD) cellular communication system. The proposed scheme used zero-forcing algorithm to eliminate multi-user interference in the uplinks,in order to achieve the effective transfer of information and energy,the full-duplex base station provided users with communication services via information beamforming and energy beamforming in the downlinks. The proposed scheme made a simultaneous improvement in power efficiency and spectrum efficiency while guaranteeing the quality-of-service( Qos) of all users and power constraints. Because the problem of power is non-convex,the original problem was transformed to a convex one via semi-definite relaxation. Simulation results showthat the proposed scheme provides substantial power savings over traditional scheme. M oreover,FD base station transfers energy to the downlink users through energy beamforming,which improves power efficiency of the system effectively.