Power control for cognitive radio systems with unslotted primary users under sensing uncertainty

Gozde Ozcan, Mustafa C Gursoy, Jian Tang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations


This paper studies the optimal power control policy and frame duration that maximize the throughput of secondary users operating under transmit power, interference power, and collision constraints in the presence of unslotted primary users. It is assumed that primary user activity follows an ON-OFF alternating renewal process. Secondary users first sense the channel albeit with errors in the form of miss detections and false alarms, and then start the data transmission only if no primary user activity is detected. Under these assumptions, we determine the optimal power control policy subject to peak transmit power and average interference power constraints and propose a lowcomplexity algorithm for the joint optimization of the power level and frame duration under collision constraints.We further analyze some important properties of the collision duration ratio, which is defined as the ratio of average collision duration to transmission duration, and investigate the impact of the probabilities of detection and false alarm on the throughput, optimal transmission power, and the collisions with primary user transmissions.

Original languageEnglish (US)
Title of host publicationIEEE International Conference on Communications
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Print)9781467364324
StatePublished - Sep 9 2015
EventIEEE International Conference on Communications, ICC 2015 - London, United Kingdom
Duration: Jun 8 2015Jun 12 2015


OtherIEEE International Conference on Communications, ICC 2015
Country/TerritoryUnited Kingdom


  • Cognitive radio
  • collision constraint
  • interference power constraint
  • optimal frame duration
  • optimal power control
  • probability of detection
  • probability of false alarm
  • renewal process
  • unslotted transmission

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications


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