Low-complexity blind equalization for OFDM systems with general constellations

Tareq Y. Al-Naffouri, Ala A. Dahman, Muhammad Sadiq Sohail, Weiyu Xu, Babak Hassibi

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

This paper proposes a low-complexity algorithm for blind equalization of data in orthogonal frequency division multiplexing (OFDM)-based wireless systems with general constellations. The proposed algorithm is able to recover the transmitted data even when the channel changes on a symbol-by-symbol basis, making it suitable for fast fading channels. The proposed algorithm does not require any statistical information about the channel and thus does not suffer from latency normally associated with blind methods. The paper demonstrates how to reduce the complexity of the algorithm, which becomes especially low at high signal-to-noise ratio (SNR). Specifically, it is shown that in the high SNR regime, the number of operations is of the order O(LN), where L is the cyclic prefix length and N is the total number of subcarriers. Simulation results confirm the favorable performance of the proposed algorithm. © 2012 IEEE.
Original languageEnglish (US)
Pages (from-to)6395-6407
Number of pages13
JournalIEEE Transactions on Signal Processing
Volume60
Issue number12
DOIs
StatePublished - Dec 2012

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering

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