Intelligent Reflecting Surface Assisted SWIPT Relay Cooperation System

Abstract

As an emerging technology, IRS can improve the channel quality, and has a very broad prospect for its application in various wireless channels. In the traditional Simultaneous Wireless Information and Power Transfer system (SWIPT), the data transmission rate will drop sharply with the increase of distance. Using IRS to assist the SWIPT system can effectively solve this problem. This paper studies the SWIPT relay cooperation system based on IRS assistance, and proposes to apply IRS in two hops respectively to optimize the system performance, reduce the cost and energy consumption. Then we analyze the impact of the deployment location of IRS, the number of IRS, the transmission power of AP and relay on the system's signal-to-noise ratio, and propose two power allocation strategies: optimal power allocation (OPA) and equal power allocation (EPA). Lastly the optimal deployment position of IRS and the performance difference between the two transmission power allocation schemes are analyzed.