Low-complexity iterative method of equalization for single carrier with cyclic prefix in doubly selective channels

Sajid Ahmed*, Mathini Sellathurai, Sangarapillai Lambotharan, Jonathon A. Chambers

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

Orthogonal frequency division multiplexing (OFDM) requires an expensive linear amplifier at the transmitter due to its high peak-to-average power ratio (PAPR). Single carrier with cyclic prefix (SC-CP) is a closely related transmission scheme that possesses most of the benefits of OFDM but does not have the PAPR problem. Although in a multipath environment, SC-CP is very robust to frequency-selective fading, it is sensitive to the time-selective fading characteristics of the wireless channel that disturbs the orthogonality of the channel matrix (CM) and increases the computational complexity of the receiver. In this paper, we propose a time-domain low-complexity iterative algorithm to compensate for the effects of time selectivity of the channel that exploits the sparsity present in the channel convolution matrix. Simulation results show the superior performance of the proposed algorithm over the standard linear minimum mean-square error (L-MMSE) equalizer for SC-CP.

Original languageEnglish (US)
Pages (from-to)5-8
Number of pages4
JournalIEEE Signal Processing Letters
Volume13
Issue number1
DOIs
StatePublished - Jan 2006
Externally publishedYes

Keywords

  • Computational complexity
  • Doubly selective channel
  • Iterative equalization

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering
  • Applied Mathematics

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