Primary user localisation and uplink resource allocation in orthogonal frequency division multiple access cognitive radio systems

Haewoon Nam, Nasir Saeed, Mahdi Ben Ghorbel, Mohamed-Slim Alouini

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

In cognitive radio networks, secondary users (SUs) can share spectrum with primary users (PUs) under the condition that no interference is caused to the PUs. To evaluate the interference imposed to the PUs, the cognitive systems discussed in the literature usually assume that the channel state information (CSI) of the link from a secondary transmitter to a primary receiver (interference link) is known at the secondary transmitter. However, this assumption may often be impractical in cognitive radio systems, since the PUs need to be oblivious to the presence of the SUs. The authors first discuss PU localisation and then introduce an uplink resource allocation algorithm for orthogonal frequency division multiple access-based cognitive radio systems, where relative location information between primary and SUs is used instead of CSI of the interference link to estimate the interference. Numerical and simulation results show that it is indeed effective to use location information as a part of resource allocation and thus a near-optimal capacity is achieved. © The Institution of Engineering and Technology 2015.
Original languageEnglish (US)
Pages (from-to)1131-1137
Number of pages7
JournalIET Communications
Volume9
Issue number8
DOIs
StatePublished - May 21 2015

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering

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