Abstract
The deployment of internet of things (IOT) devices in several applications is limited by their need of having batteries as a power source. This has led many researchers to make efforts on simultaneous wireless information and power transfer (SWIPT) systems design. Increasing the bandwidth provides higher capacity; however, due to the narrowband response of conventional power transfer subsystems, power delivery is decreased. In order to design an optimum wideband SWIPT system, first, a realistic model of the system, including antennas and rectifier, should be developed. Then, proper methods to increase the bandwidth of subsystems for optimum power delivery can be proposed. In this paper, a wideband SWIPT system (300 MHz bandwidth at the center frequency of 1.44 GHz) while considering realistic limitations of antennas and rectifiers is designed. To optimize the system performance, a novel power allocation method is proposed. Using this algorithm, Pareto fronts of Shannon channel capacity versus power delivery in three scenarios (broadband antennas without considering rectifier, broadband antennas with narrowband rectifier and broadband antennas with broadband rectifier) are compared. The results show that, without considering the realistic behaviour of the subsystems, the performance is largely overestimated. Furthermore, this model allows for designers to optimize each subsystem directly and assess its effect on the overall SWIPT system performance.
Highlights
Promising applications of Internet of Things (IOT) and its demand for low power consumption have directed many researchers to study and design Simultaneous Wireless Information and PowerTransfer (SWIPT) systems [1,2,3]
The Shannon channel capacity for AWGN channel Cs is a function of signal-to-noise ratio
Two broadband antennas are considered, it is assumed that the receiver contains a narrowband rectenna, and the broadband rectenna is considered as a receiver
Summary
Promising applications of Internet of Things (IOT) and its demand for low power consumption have directed many researchers to study and design Simultaneous Wireless Information and Power. Radio-Frequency Identification (RFID) [4,5], wireless sensors [6,7,8,9], and Multi Input Multi output (MIMO) technology [10,11,12,13] In these applications, the goal of wireless power transfer (WPT) is providing the required energy for transferring the information. In order to consider the effect of rectifier that its characteristics change by frequency and input power, an iterative procedure using water-filling algorithm is proposed to allot the transmission power. The iterative algorithm proposed here for power allocation considers the conversion efficiency of the rectifier as a function of input power and frequency.
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