Preamble-based channel estimation in OFDM/OQAM systems: A review

Eleftherios Kofidis, Dimitrios Katselis, Athanasios Rontogiannis, Sergios Theodoridis

Research output: Contribution to journalReview articlepeer-review


Filter bank-based multicarrier communications (FBMC) have recently attracted increased interest in both wired (e.g., xDSL, PLC) and wireless (e.g., cognitive radio) applications, due to their enhanced flexibility, higher spectral efficiency, and better spectral containment compared to conventional OFDM. A particular type of FBMC, the so-called FBMC/OQAM or OFDM/OQAM system, consisting of pulse shaped OFDM carrying offset QAM (OQAM) symbols, has received increasing attention due to, among other features, its higher spectral efficiency and implementation simplicity. It suffers, however, from an imaginary inter-carrier/inter-symbol interference that complicates signal processing tasks such as channel estimation. This paper focuses on channel estimation for OFDM/OQAM systems based on a known preamble. A review of the existing preamble structures and associated channel estimation methods is given, for both single- (SISO) and multiple-antenna (MIMO) systems. The various preambles are compared via simulations in both mildly and highly frequency selective channels.

Original languageEnglish (US)
Pages (from-to)2038-2054
Number of pages17
JournalSignal Processing
Issue number7
StatePublished - Jul 2013
Externally publishedYes


  • Channel estimation
  • Filter bank-based multicarrier (FBMC)
  • Intrinsic interference
  • Offset QAM (OQAM)
  • Orthogonal frequency division multiplexing (OFDM)
  • Preamble

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Software
  • Signal Processing
  • Computer Vision and Pattern Recognition
  • Electrical and Electronic Engineering


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