Cognitive single-carrier systems: Joint impact of multiple licensed transceivers

Kyeong Jin Kim, Lifeng Wang, Trung Q. Duong, Maged Elkashlan, H. Vincent Poor

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


In this paper, the impact of interference from multiple licensed transceivers on cognitive underlay single-carrier systems is examined. Specifically, the situation is considered in which the secondary network is limited by three key parameters: 1) maximum transmit power at the secondary transmitter, 2) peak interference power at the primary receivers, and 3) interference power from the primary transmitters. For this cognitive underlay single-carrier system, the signal-to-interference ratio (SIR) of the secondary network is obtained for transmission over frequency-selective fading channels. Based on this, a new closed-form expression for the cumulative distribution function of the SIR is evaluated, from which the outage probability and the ergodic capacity are derived. Further insights are established by analyzing the asymptotic outage probability and the asymptotic ergodic capacity in the high-transmission-power regime. In particular, it is corroborated that the asymptotic outage diversity gain is equal to the multipath gain of the frequency-selective channel in the secondary network. The asymptotic ergodic capacity also gives new insight into the additional power cost for different network parameters while maintaining a specified target ergodic capacity. Illustrative numerical examples are presented to validate the outage probability and ergodic capacity under different interference power profiles.

Original languageEnglish (US)
Article number6819464
Pages (from-to)6741-6755
Number of pages15
JournalIEEE Transactions on Wireless Communications
Issue number12
StatePublished - Dec 1 2014

All Science Journal Classification (ASJC) codes

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


  • Cognitive radio
  • ergodic capacity
  • frequencyselective fading
  • outage probability
  • primary transceivers
  • singlecarrier transmission


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