Preamble-Based Channel Estimation for CP-OFDM and OFDM/OQAM Systems: A Comparative Study

Author

Katselis, Dimitrios ; Kofidis, Eleftherios ; Rontogiannis, Athanasios ; Theodoridis, Sergios

Author_Institution

Dept. of Inf. & Telecommun., Univ. of Athens, Athens, Greece

Volume

58

Issue

5

fYear

2010

fDate

5/1/2010 12:00:00 AM

Firstpage

2911

Lastpage

2916

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.

Keywords

OFDM modulation; channel estimation; discrete Fourier transforms; least squares approximations; quadrature amplitude modulation; CP-OFDM systems; OFDM-OQAM systems; cyclic prefix; discrete Fourier transform; orthogonal frequency division multiplexing system; preamble-based least square channel estimation; quadrature amplitude modulation; 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);

fLanguage

English

Journal_Title

Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1053-587X

Type

jour

DOI

10.1109/TSP.2010.2043129

Filename

5411813