Journal
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
Volume 8, Issue 6, Pages 3028-3037Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TWC.2009.080482
Keywords
Dynamic spectrum access; two-stage sensing; PLL settling time; detection time; power consumption
Funding
- Div Of Industrial Innovation & Partnersh
- Directorate For Engineering [968877] Funding Source: National Science Foundation
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Dynamic spectrum access (DSA) is a promising approach for the more effective use of existing spectrum. Of fundamental importance to DSA is the need for fast and reliable spectrum sensing over a wide bandwidth. A model for two-stage sensing is described based on an analysis of the mean time to detect an idle channel. Simulation results show that it provides significantly faster idle channel detection than conventional single-stage random searching. Several system-level issues are also investigated including the settling time of the phase-locked loop (PLL) in the frequency synthesizer, which determines the channel switching time. Effects of the bandwidth of the coarse sensing block and the integration duration of the energy detector are also presented.
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