An interference-cancellation scheme for carrier frequency offsets correction in OFDMA systems

Defeng Huang, Khaled Ben Letaief

Research output: Contribution to journalArticle

195 Citations (Scopus)

Abstract

Recently, orthogonal frequency-division multiplexing (OFDM), with clusters of subcarriers allocated to different subscribers (often referred to as OFDMA), has gained much attention for its ability in enabling multiple-access wireless multimedia communications. In such systems, carrier frequency offsets (CFOs) can destroy the orthogonality among subcarriers. As a result, multiuser interference (MUI) along with significant performance degradation can be induced. In this paper, we present a scheme to compensate for the CFOs at the base station of an OFDMA system. In the proposed scheme, circular convolutions are employed to generate the interference after the discrete Fourier transform processing, which is then removed from the original received signal to increase the signal-to-interference power ratio (SIR). Both SIR analysis and simulation results will show that the proposed scheme can significantly improve system performance.

Original languageEnglish
Pages (from-to)1155-1165
Number of pages11
JournalIEEE Transactions on Communications
Volume53
Issue number7
DOIs
Publication statusPublished - 1 Jul 2005

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Keywords

  • 802.16a
  • Carrier frequency offsets (CFOs) correction
  • Multiple access
  • Orthogonal frequency-division multiplexing (OFDM)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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