Capacity-maximization threshold design for wideband sensing with guaranteed minimum primary user rate
Department of Electrical and Computer Engineering, McGill University, Montreal, QC, H3A 0E9, Canada
EURASIP Journal on Wireless Communications and Networking 2012, 2012:360 doi:10.1186/1687-1499-2012-360Published: 6 December 2012
We investigate the design of optimal threshold for energy detection of primary user (PU) beacon signals in spectrum sensing. The weighted sum of the PU and secondary user (SU) link rates is used as the objective function with constraint on the guaranteed minimum PU link rate. SU with wideband sensing capability selects the idle frequency-slot with the lowest sensed power to be the candidate to access. Numerical results show that the wideband sensing capability with the proposed optimal threshold and accessing strategy can help the SU to meet the stringent PU rate constraints while achieving much higher SU link rate and network capacity.