Abstract
In this paper, we investigate a dual-hop simultaneous wireless information and power transfer (SWIPT) based amplifying-and-forward (AF) multiple-input multiple-output (MIMO) relay communication system where the relay node harvests energy based on radio frequency (RF) signals transmitted from the source node through the hybridized power-time splitting-based relaying (HPTSR) protocol to forward information to the destination node. The joint optimization of the time-switching (TS) factor, source and relay precoding matrices, and the power-splitting (PS) ratio vector is proposed to maximize the mutual information (MI) between the source and destination nodes. We derive the optimal structure for the source and relay precoding matrices to simplify the transceiver optimization problem. Two algorithms based on the upper bound and lower bound of the objective function are proposed to efficiently solve the optimization problem with low computational complexity. Numerical examples demonstrate that the proposed algorithms provide a better MI performance compared with TS based and PS based energy harvesting (EH) relay systems.
Highlights
T HE number of wireless devices around the world is having a skyrocketing increase for the past few years
The energy harvesting (EH) method which exploits the usage of radio frequency (RF) signals in wireless power transfer (WPT) and wireless information transfer (WIT) simultaneously is known as simultaneous wireless information and power transfer (SWIPT) [4]
Different from existing works using the PS-based EH relaying protocol [1], [20], [21], [24], [25] and the TS-based EH relaying protocol [1], [22]–[25], to increase the energy harvested at the relay node, which is expected to provide a better performance of the proposed system, a hybrid EH scheme which is known as hybridized power-time splitting-based relaying (HPTSR) protocol is adopted at the relay node
Summary
T HE number of wireless devices around the world is having a skyrocketing increase for the past few years. In [19], two approaches which are known as the iterative algorithm and the channel diagonalization-based algorithm are developed to solve the joint source and relay precoder optimization problem in wireless powered MIMO relay networks. Different from existing works using the PS-based EH relaying protocol [1], [20], [21], [24], [25] and the TS-based EH relaying protocol [1], [22]–[25], to increase the energy harvested at the relay node, which is expected to provide a better performance of the proposed system, a hybrid EH scheme which is known as hybridized power-time splitting-based relaying (HPTSR) protocol is adopted at the relay node.
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