On the effect of I/Q imbalance on energy detection and a novel four-level hypothesis spectrum sensing

Omid Semiari, Behrouz Maham, Chau Yuen

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Direct-conversion transceivers are in demand due to low implementation cost of analog front ends. However, these transmitters or receivers introduce imperfections such as in-phase and quadrature-phase (I/Q) imbalances. In this paper, we first investigate the effect of I/Q imbalance on the performance of primary system and show that these impairments can severely degrade the performance of cognitive radio system that are based on orthogonal frequency-division multiplexing (OFDM) multiple-access scheme. Next, we design a new four-level hypothesis blind detector for spectrum sensing in such cognitive radio system and show that the proposed detector is less vulnerable to I/Q imbalance than conventional two-level detectors.

Original languageEnglish
Article number6742610
Pages (from-to)4136-4141
Number of pages6
JournalIEEE Transactions on Vehicular Technology
Volume63
Issue number8
DOIs
Publication statusPublished - Oct 1 2014

Keywords

  • Blind detection
  • I/Q imbalance
  • cognitive radio
  • fading channels
  • orthogonal frequency-division multiplexing (OFDM)

ASJC Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Applied Mathematics

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