Title :
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
fDate :
5/1/2010 12:00:00 AM
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);
Journal_Title :
Signal Processing, IEEE Transactions on
DOI :
10.1109/TSP.2010.2043129
