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

  • Authors:
  • Dimitrios Katselis;Eleftherios Kofidis;Athanasios Rontogiannis;Sergios Theodoridis

  • Affiliations:
  • Department of Informatics and Telecommunications, University of Athens, Panepistimioupolis, Ilissia, Athens, Greece;Department of Statistics and Insurance Science, University of Piraeus, Piraeus, Greece;Institute for Space Applications and Remote Sensing, National Observatory of Athens, P. Penteli, Greece;Department of Informatics and Telecommunications, University of Athens, Panepistimioupolis, Ilissia, Athens, Greece

  • Venue:
  • IEEE Transactions on Signal Processing
  • Year:
  • 2010

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Abstract

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.