An optimal resource allocation strategy for MIMO relay system is considered in simultaneous wireless information and energy\ntransfer network, where two users with multiple antennas communicate with each other assisted by an energy harvesting MIMO\nrelay that gathers energy from the received signal by applying time switching scheme and forwards the received signal by using the\nharvesting energy. It is focused on the precoder design and resource allocation strategies for the system to allocate the resources\namong the nodes in decode-and-forward (DF) mode. Specifically, optimal precoder design and energy transfer strategy in MIMO\nrelay channel are firstly proposed. Then, we formulate the resource allocation optimization problem. The closed-form solutions for\nthe time and power allocation are derived. It is revealed that the solution can flexibly allocate the resource for the MIMO relay\nchannel to maximize the sum rate of the system. Simulation results demonstrated that the performance of the proposed algorithm\noutperforms the traditional fixed method.
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