Dynamic spectral shaping in cognitive radios with quality of service constraints

Authors:
Deepak R. Joshi;Dimitrie C. Popescu;Octavia A. Dobre
Affiliations:
Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, Virginia;Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, Virginia;Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, Canada
Venue:
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Year:
2009

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Abstract

In this paper we consider cognitive radios (CR) that employ orthogonal frequency division multiplexing (OFDM) modulation at the physical layer and present an algorithm for transmitter adaptation subject to specified quality of service (QoS) constraints. The proposed algorithm explicitly considers multipath channels between the CR transmitter and its intended receiver, and performs joint spectral shaping and transmitter power control in order to avoid spectral bands used by licensed users of the spectrum while maintaining specified target signalto-interference+noise-ratios (SINR) at the CR receiver. The algorithm is illustrated with numerical examples obtained from simulations in which dynamic scenarios are considered with licensed transmitters getting in and out of the system.