The performance of an orthogonal frequency-division multiplexing (OFDM)-based spectrum sharing communication system that assumes random access and no information about the primary user's (PU) channel occupation information is studied. Also, no cooperation, information exchange overhead, or subcarrier allocation mechanism between the secondary users (SUs) is assumed. SUs randomly access the subcarriers of the primary network and collide with the PUs' subcarriers with a certain probability. To maintain the quality of service (QoS) requirement of PUs, the interference that SUs causes onto PUs is controlled by adjusting SUs transmit power below a predefined threshold, termed interference temperature. Herein paper, the average capacity of SU with subcarrier collisions is employed as performance measure to investigate the proposed random access scheme. Bounds and scaling laws of average capacity with respect to the number of SUs', PUs' and available subcarriers are derived, and corroborated by computer simulations.

Original languageEnglish
Title of host publication2012 Wireless Advanced, WiAd 2012
Number of pages5
Publication statusPublished - 29 Oct 2012
Event2012 Wireless Advanced, WiAd 2012 - London, United Kingdom
Duration: 25 Jun 201227 Jun 2012

Publication series

Name2012 Wireless Advanced, WiAd 2012


Other2012 Wireless Advanced, WiAd 2012
CountryUnited Kingdom


ASJC Scopus subject areas

  • Computer Networks and Communications
  • Signal Processing

Cite this

Ekin, S., Qaraqe, K. A., Abdallah, M. M., & Serpedin, E. (2012). On OFDM-based cognitive radio spectrum sharing systems with random access. In 2012 Wireless Advanced, WiAd 2012 (pp. 34-38). [6296563] (2012 Wireless Advanced, WiAd 2012). https://doi.org/10.1109/WiAd.2012.6296563