基于信息能量同传的异构小蜂窝网络能效优化

研究无线信息和能量协同传输(simultaneous wireless information and power transfer，SWIPT)异构小蜂窝网络的能效优化问题。保证小蜂窝用户和宏用户通信质量、小蜂窝用户能量采集和小蜂窝基站传输功率等约束下，为实现小蜂窝系统下行能效的最大化，对小蜂窝基站发射功率和小蜂窝用户端功率分流系数进行联合优化。该问题属于非凸优化问题，通过变量替换对原问题作等价转换，然后采用基于拉格朗日乘子的次梯度算法求解。计算机仿真结果表明，该联合优化算法简单有效。

Energy efficiency optimization of heterogeneous small cellular networks with simultaneous wireless information and power transfer

Research on energy efficiency optimization of simultaneous wireless information and power transfer in heterogeneous small cellular networks. In order to maximize the energy efficiency of the downlink cellular system by jointly designing transmit beamforming vector and receive power splitting ratio under both small cellular users'' communication quality and the collected energy, and the transmission power of the small cell base station constraints. The problem belongs to the nonconvex optimization problem, and the equivalent problem is transformed by the variable substitution, and then the subgradient iteration algorithm based on the Lagrange multiplier is used to solve the problem. The results of computer simulation show that the joint optimization algorithm is simple and effective.