Methods of signal classification using the images produced by the Wigner-Ville distribution
Pattern Recognition Letters
Signal Processing - From signal processing theory to implementation
Eigenvalue-based spectrum sensing algorithms for cognitive radio
IEEE Transactions on Communications
Sensitive white space detection with spectral covariance sensing
IEEE Transactions on Wireless Communications
Cognitive Medium Access: Exploration, Exploitation, and Competition
IEEE Transactions on Mobile Computing
Spectrum sensing in cognitive radio networks: requirements, challenges and design trade-offs
IEEE Communications Magazine
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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.