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|Title:||How often and how long should a cognitive radio sense the spectrum?|
|Published:||April 07, 2010|
|Abstract:||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:||IEEE DySPAN 2010|
|Dates:||April 6-9, 2010|
|Keywords:||cognitive radio networks, opportunistic spectrum access, MAC layer protocol, pricing, economic model, Bayesian hypothesis testing|
|PDF version:||Click here to retrieve PDF version of paper (528KB)|