Preamble-based channel estimation for CP-OFDM and OFDM/OQAM systems: A comparative study

Dimitrios Katselis, Eleftherios Kofidis, Athanasios Rontogiannis, Sergios Theodoridis

Research output: Contribution to journalArticlepeer-review


In this correspondence, preamble-based least squares (LS) channel estimation in orthogonal frequency division multiplexing (OFDM) systems of the QAM and offset QAM (OQAM) types is considered. The construction of optimal (in the mean squared error (MSE) sense) preambles is investigated, for sparse (a subset of pilot tones, surrounded by nulls) preambles. The two OFDM systems are compared for the same transmit power, which, for cyclic prefix (CP) based OFDM/QAM, also includes the power spent for CP transmission. OFDM/OQAM, with a sparse preamble consisting of equipowered and equispaced pilots embedded in zeros, turns out to perform at least as well as CP-OFDM. Simulations results are presented that verify the analysis.

Original languageEnglish (US)
Article number5411813
Pages (from-to)2911-2916
Number of pages6
JournalIEEE Transactions on Signal Processing
Issue number5
StatePublished - May 2010
Externally publishedYes


  • Channel estimation
  • Cyclic prefix (CP)
  • Discrete Fourier transform (DFT)
  • Least squares (LS)
  • Mean squared error (MSE)
  • Offset QAM (OQAM)
  • Orthogonal frequency division multiplexing (OFDM)
  • Pilots
  • Preamble
  • Quadrature amplitude modulation (QAM)

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering


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