A feedback-soft sensing-based access scheme for cognitive radio networks

Ahmed M. Arafa, Karim G. Seddik, Ahmed K. Sultan, Tamer Elbatt, Amr A. El-Sherif

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


In this paper, we examine a cognitive spectrum access scheme in which secondary users exploit the primary feedback information. We consider an overlay secondary network employing a random access scheme in which secondary users access the channel by certain access probabilities that are functions of the spectrum sensing metric. In setting our problem, we assume that secondary users can eavesdrop on the primary link's feedback. We study the cognitive radio network from a queuing theory point of view. Access probabilities are determined by solving a secondary throughput maximization problem subject to a constraint on the primary queues' stability. First, we formulate our problem which is found to be non-convex. Yet, we solve it efficiently by exploiting the structure of the secondary throughput equation. Our scheme yields improved results in, both, the secondary user throughput and the primary user packet delay as compared to the scheme where no feedback information is exploited. In addition, it comes very close to the optimal genie-aided scheme in which secondary users act upon the presumed perfect knowledge of the primary users' activity. © 2013 IEEE.
Original languageEnglish (US)
Pages (from-to)3226-3237
Number of pages12
JournalIEEE Transactions on Wireless Communications
Issue number7
StatePublished - Jun 28 2013
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2023-09-22

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering


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