How often and how long should a cognitive radio sense the spectrum?
This paper presents a Bayesian framework and a pricing structure for a secondary wireless user that opportunistically uses a RF channel belonging to a network of N primary users. The secondary user operates in a time-slotted fashion, where each time slot consists of observing the channel for D seconds followed by possibly using it for W seconds depending on the decision the user makes after observing the channel. The paper assumes the secondary user observes the on-off Markov process modeling the primary user activity corrupted by additive white Gaussian noise, and it employs a decision rule that is a time-averager followed by a threshold device. The pricing structure includes rewards for the secondary user for successful use of the channel and penalties when it interferes with the primary users. The paper derives a formula for the time normalized net profit of the secondary user. Numerical results are presented that show the behavior of the maximum profit as a function of various network parameters.
How often and how long should a cognitive radio sense the spectrum?, IEEE DySPAN 2010, Singapore, -1, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=904316
(Accessed December 9, 2023)