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How often and how long should a cognitive radio sense the spectrum?



Nader Moayeri


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.
Proceedings Title
Conference Dates
April 6-9, 2010
Conference Location


cognitive radio networks, opportunistic spectrum access, MAC layer protocol, pricing, economic model, Bayesian hypothesis testing


Moayeri, N. (2010), How often and how long should a cognitive radio sense the spectrum?, IEEE DySPAN 2010, Singapore, -1, [online], (Accessed July 17, 2024)


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Created April 7, 2010, Updated February 19, 2017