URG paper published in IEEE Trans UFFC journal
Another paper by the Ultrasonics Research Group in UCC has been published in the journal IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control.
The full citation is: W. Jiang and W. M. D. Wright, "An Indoor Airborne Ultrasonic Wireless Communication Network", IEEE Trans. Ultrason. Ferroelec. Freq. Contr., (2018) dx.doi.org/10.1109/TUFFC.2018.2841501
Abstract: There is an increasing interest in the use of modulated airborne ultrasound as a means of indoor wireless communication. By using commercially available capacitive ultrasonic transducers at 50 kHz, this paper describes the successful practical implementation of a prototype airborne ultrasonic communication network with ceiling-mounted base stations and a mobile transceiver unit. An asynchronous ultrasonic location technique using Gold code modulated ranging signals was chosen to optimise the modulation schemes and data transfer, and offered automatic handover between different cell regions on a switch on and off basis as all base stations used the same frequency bands for data transmission. 16-quadrature amplitude modulation (QAM) based on orthogonal frequency division multiplexing (OFDM) was used to achieve an uplink data transfer rate of 37.4 kb/s while the range was extended by using quadrature phase-shift keying (QPSK)-OFDM with a data rate of 18.7 kb/s. For the uplink connection, the achieved data rates using 16QAM-OFDM and QPSK-OFDM were 36.1 kb/s and 18.1 kb/s, respectively. A more robust handover technique using received signal strength with hysteresis was also proposed to improve system efficiency when multiple mobile receivers used the service.