Research On SWIPT System Based On MIMO Interference Channel

Simultaneous wireless information and power transfer (SWIPT)allows for transmitting information and power simultaneously, which can effectively alleviate the shortage of battery life of mobile devices, and has broad application and research prospects [1]. In the present study, although the research on SWIPT is becoming more and more thorough, few studies have considered the influence of Interference (CCI:Co channel Interference) on the Simultaneous wireless information and power transfer system. Although the interference signal will reduce the reliability of signal transmission, but it benefit to power transfer, and because the spliter can not effectively distinguish interference and the received signal, so the useful signal interference and emission will be together divided into ID and EH signal energy by spliter, so you can make full use of the interference to improve the system gain. So on the basis of the above, this paper establishes a wireless SWPT system based on MIMO interference channel.Research on SWIPT system based on MIMO interference channel in this paper, including the full duplex SWIPT system and SWIPT relay system. Firstly, the system model is established and all communication nodes are designed with multiple antennas.Secondly, based on the respective system model we establish the mathematical model, then put forward the corresponding optimization problem. the objective function of optimization problem is the total mean squared error of system, and we also consider the same frequency interference, and transmit power constraint and energy harvest constraint.Because the initial optimization problem is not convex, it is difficult to solve the problem directly, so in this paper, the optimization problem is quantified by the matrix and convert to a non convex Quadratically Constrained Quadratic Program (QCQP) problem first, then zoom in on the non convex QCQP problem into a SOCP(Second-Order Cone Program)problem. On this basis, we use FFP-SCA scheme, and finally to solve the problem with iterative algorithm. We also propose a sub optimal scheme,which simplifies the optimization problem into a single constraint problem,then the Lagrange function and KKT condition are used to solve the optimization problem, which can reduce the computational complexity.Finally, a simulation platform is built to solve the problem, and for the solution of SOCP, Sedumi Matlab solver is used. We also analyze the simulation results and compare the performance of SC A scheme and sub optimal sheme under different scenarios. The simulation results show that the interference channel can bring the gain to the system, and the SCA scheme has better performance.