Enabling location and environment awareness in cognitive radios
Computer Communications
Identification of LOS in time-varying, frequency selective radio channels
EURASIP Journal on Wireless Communications and Networking
Fundamental limits on time delay estimation in dispersed spectrum cognitive radio systems
IEEE Transactions on Wireless Communications
OFDM for cognitive radio: merits and challenges
IEEE Wireless Communications
Opportunistic spectrum sharing with multiple cochannel primary transmitters
IEEE Transactions on Wireless Communications
Time-Delay estimation in dispersed spectrum cognitive radio systems
EURASIP Journal on Advances in Signal Processing - Special issue on advanced signal processing for cognitive radio networks
Reformulating the least-square source localization problem with contracted distances
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Wireless Personal Communications: An International Journal
Journal of Signal Processing Systems
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Location awareness is one of the essential characteristics of cognitive radios. In this paper, an innovative cognitive positioning system (CPS) that achieves accuracy adaptation in both indoor and outdoor environments is proposed as a step towards realization of location awareness in cognitive radios. The proposed CPS is composed of two modes; bandwidth determination and enhanced dynamic spectrum management (EDSM). Bandwidth determination equations are derived through Cramer-Rao Lower Bound (CRLB) for both additive white Gaussian noise (AWGN) and multipath channels. An EDSM system providing the optimum available bandwidth to the CPS is proposed. Overlay spectrum access based EDSM (O-EDSM) and hybrid overlay and underlay spectrum access based EDSM (H-EDSM) are two schemes that are introduced. A switching mechanism that manages the transition between underlay and overlay spectrum usage modes for the H-EDSM algorithm is presented. The theoretical analysis of the mechanism is carried out using Two-slope model. Simulation results, challenges and complexity options for the implementation of the CPS are outlined. Our study reveals the existence of a trade-off between the accuracy and complexity in the cognitive positioning systems.