Abstract
A discrete Fourier transform (DFT)-based channel estimator for orthogonal frequency division multiplexing (OFDM) systems is proposed. In multipath channels with non-sample-spaced time delays, the conventional DFT approach will cause power leakage and result in an error floor. Proposed is a novel symmetric extension DFT method to reduce the leakage power efficiently. Numerical results show that the proposed channel estimator can eliminate the error floor substantially.
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