Abstract
This paper considers power splitting (PS)-based simultaneous wireless information and power transfer (SWIPT) for multiple-input multiple-output (MIMO) interference channel networks where multiple transceiver pairs share the same frequency spectrum. As the PS model is adopted, an individual receiver splits the received signal into two parts for information decoding (ID) and energy harvesting (EH), respectively. Aiming to minimize the total transmit power, transmit precoders, receive filters and PS ratios are jointly designed under a predefined signal-to-interference-plus-noise ratio (SINR) and EH constraints. The formulated joint transceiver design and power splitting problem is non-convex and thus difficult to solve directly. In order to effectively obtain its solution, the feasibility conditions of the formulated non-convex problem are first analyzed. Based on the analysis, an iterative algorithm is proposed by alternatively optimizing the transmitters together with the power splitting factors and the receivers based on semidefinite programming (SDP) relaxation. Moreover, considering the prohibitive computational cost of the SDP for practical applications, a low-complexity suboptimal scheme is proposed by separately designing interference-suppressing transceivers based on interference alignment (IA) and optimizing the transmit power allocation together with splitting factors. The transmit power allocation and receive power splitting problem is then recast as a convex optimization problem and solved efficiently. To further reduce the computational complexity, a low-complexity scheme is proposed by calculating the transmit power allocation and receive PS ratios in closed-form. Simulation results show the effectiveness of the proposed schemes in achieving SWIPT for MIMO interference channel (IC) networks.
Highlights
Harvesting energy from RF signals is a promising solution to provide perpetual and cost-effective power supplies for wireless networks [1]
We provide some preliminaries on interference alignment (IA) and joint transceiver designs for multiple-input multiple-output (MIMO)
Simulation results are presented to demonstrate the performance of the proposed transceiver design and power splitting schemes in MIMO interference channel (IC) simultaneous wireless information and power transfer (SWIPT) systems
Summary
Harvesting energy from RF signals is a promising solution to provide perpetual and cost-effective power supplies for wireless networks [1]. Compared with traditional energy harvesting (EH) methods that are dependent on external sources, such as solar power and wind energy, harvesting energy from RF signals makes it possible to supply energy for the wireless devices on demand at any time and brings great convenience and guarantees quality of service for wireless systems. By combing EH with traditional information transmission, it is expected that the power line connected to the mobile devices would be dismissedcompletely in future wireless communications [5]. Due to these demands and technical advances, simultaneous wireless information and power transfer (SWIPT) constitutes one of the main techniques for 5G wireless networks [6], and has aroused wide attention from both academia and industry recently.
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