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http://dx.doi.org/10.3837/tiis.2017.04.004

An Adaptive-Harvest-Then-Transmit Protocol for Wireless Powered Communications: Multiple Antennas System and Performance Analysis  

Nguyen, Xuan Xinh (Wireless Communications Research Group (WiCOM), Ton Duc Thang University)
Do, Dinh-Thuan (Wireless Communications Research Group (WiCOM), Ton Duc Thang University)
Publication Information
KSII Transactions on Internet and Information Systems (TIIS) / v.11, no.4, 2017 , pp. 1889-1910 More about this Journal
Abstract
This paper investigates a protocol so-called Adaptive Harvest Then Transmit (AHTT) for wireless powered communication networks (WPCNs) in multiple-input single-output (MISO) downlink systems, which assists in transmitting signals from a multi-antenna transmitter to a single-antenna receiver. Particularly, the power constrained relay is supplied with power by utilizing radio frequency (RF) signals from the source. In order to take advantage of multiple antennas, two different linear processing schemes, including Maximum Ratio Combining (MRC) and Selection Combination (SC) are studied. The system outage capacity and ergodic capacity are evaluated for performance analysis. Furthermore, the optimal power allocation is also considered. Our numerical and simulation results prove that the implementation of multiple antennas helps boost the energy harvesting capability. Therefore, this paper puts forward a new way to the energy efficiency (EE) enhancement, which contributes to better system performance.
Keywords
Wireless powered communications (WPC); multiple antennas; multiple-input single-output; multiple antennas; power allocation;
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