The green communication for 5th generation Internet of Things base on the energy collecting and security issues is studied in this paper. The transceiver and power splitting factor are optimized aiming at minimizing the transmitting power at the source node subject to the security performance and energy collection. Since the optimization problem is a nonconvex function, an iteration optimization algorithm is proposed to divide the objective optimization function into two subproblems, namely, a joint transmitter and PS factor optimization subproblem and a minimum mean-square error-based receiving filter optimization subproblem. Furthermore, since the transmitter and PS combining optimization subproblem is still a nonconvex function, the semidefinite relaxation technique is used to transform it into a convex function. The feasibility of the optimization problem and the convergency of the iteration algorithm are proved in theory, and the simulation results show the availability of the proposed scheme.

本文研究了基于能量收集和安全问题的第五代物联网的绿色通信。对收发器和功率分配因子进行了优化，目的是使受安全性能和能量收集影响的源节点的发射功率最小。由于优化问题是一个非凸函数，提出了一种迭代优化算法，将目标优化函数分为两个子问题，即联合发射机和PS因子优化子问题以及基于最小均方误差的接收滤波器优化子问题。此外，由于发射机和PS组合优化子问题仍然是非凸函数，因此使用半定松弛技术将其转换为凸函数。