A reconfigurable upper audio band modem for data communication between mobile devices

作者：Sinha Rahul^*; Balamuralidhar P; Bhujade Rajeev M

来源：Analog Integrated Circuits and Signal Processing, 2014, 78(3): 669-682.

DOI：10.1007/s10470-013-0175-y

• Multi-tone FSK
• Upper audio band
• Wigner-Ville distribution
• Wigner-Ville spectrum
• Eigen decomposition
• Spectrum sensing
• Spectrum access

For communicating short data sequences over small distances, the use of devices with conventional wireless radio frequency interfaces requires standardized hardware, dedicated infrastructure and appropriate Link/Network layer protocols. To address challenges associated with these requirements, a communication mechanism using devices which support simple audio interfaces (speakers and microphones) is proposed using the upper audio band (UAB) of frequencies (16-20 kHz). Devices with audio interfaces can be deployed in a personal area network for communicating at low data rates over small distances. Multi-tone FSK modulation is used for transmitting Reed-Solomon encoded data over the UAB. For peer-to-peer communication applications, a sensing mechanism is enabled on the receiving device to sense for empty time-frequency slots and schedule its data transmission at the appropriate times. A system prototype is developed using portable speakers and smartphones with sensitive microphones. The effective throughput of the modem is evaluated for different sensing durations and distances. Ad-hoc peer-to-peer networks can be enabled between mobile devices for communicating short data sequences based on the UAB modem.

• 出版日期2014-3