@article{li_short-range_2009,
	title = {Short-range ultrasonic communications in air using quadrature modulation},
	volume = {56},
	issn = {0885-3010},
	doi = {10.1109/TUFFC.2009.1289},
	abstract = {A study has been undertaken of ultrasonic communications methods in air, using a quadrature modulation method. Simulations were first performed to establish the likely performance of quadrature phase shift keying over the limited bandwidth available in an ultrasonic system. Quadrature phase shift keying modulation was then implemented within an experimental communication system, using capacitive ultrasonic sources and receivers. The results show that such a system is feasible in principle for communications over distances of several meters, using frequencies in the 200 to 400 kHz range.},
	number = {10},
	journal = {IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control},
	author = {Li, C. and Hutchins, D. A. and Green, R. J.},
	month = oct,
	year = {2009},
	note = {00000},
	pages = {2060--2072}
}

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