Title :
Near field wireless power transfer and quadrature amplitude modulated (QAM) communication link
Author :
Besnoff, Jordan ; Ricketts, David S.
Author_Institution :
Dept. of Electr. & Comput. Eng., North Carolina State Univ., Raleigh, NC, USA
Abstract :
We present a near field wireless power transfer (NF-WPT) link which is also capable of data communication through complex, quadrature amplitude (QAM) load modulation. We present a method for designing a 4QAM constellation that allows for minimal degradation of the NF-WPT link efficiency by minimizing the complex reflection coefficient. Using a modulation board and a resonant 4-coil NF-WPT system we demonstrate 307.2kbps data transmission, representing a 12.7% fractional bandwidth, over a distance of 1-coil diameter (29cm) at a carrier frequency of 2.428MHz. Efficiency of the NF-WPT is only reduced from 68% to approximately 63.1% when used for data communication as well as power transfer.
Keywords :
data communication; near-field communication; quadrature amplitude modulation; radiofrequency power transmission; NF-WPT link; QAM communication link; QAM constellation; QAM load modulation; bit rate 307.2 kbit/s; carrier frequency; data communication; data transmission; fractional bandwidth; frequency 2.428 MHz; modulation board; near field wireless power transfer link; quadrature amplitude load modulation; reflection coefficient; resonant 4-coil NF-WPT system; size 29 cm; Bit rate; Frequency measurement; Frequency modulation; Impedance; Loss measurement; Quadrature amplitude modulation;
Conference_Titel :
Wireless Power Transfer Conference (WPTC), 2015 IEEE
Conference_Location :
Boulder, CO
DOI :
10.1109/WPT.2015.7139131
