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International Journal of Antennas and Propagation
Volume 2015 (2015), Article ID 109818, 6 pages
http://dx.doi.org/10.1155/2015/109818
Research Article

An Optimal Transmission Strategy for Joint Wireless Information and Energy Transfer in MIMO Relay Channels

Information Engineering School, Nanchang University, Nanchang 330031, China

Received 31 July 2014; Revised 29 December 2014; Accepted 8 January 2015

Academic Editor: Christoph F. Mecklenbräuker

Copyright © 2015 Dingcheng Yang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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