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Time-selective channel estimator for orthogonal frequency division multiplexing (OFDM) systems using pilot added scheme is proposed in this paper. The OFDM system is with robustness to multipath fading in wireless communications. At the same time, time-variation can destroy the orthogonality between subcarriers which will degrade the performance of the system. In this paper, we propose a pilot added...
Channel estimation and data detection are investigated for OFDM systems over time- and frequency-selective (doubly selective) channels. Relying on the complex exponential basis expansion channel model, a pilot embedded channel estimation scheme with low computational complexity and high data rate efficiency is proposed. An iterative edition exploiting recovered data to enhance the performance is also...
Doubly-selective channel estimator for orthogonal frequency division multiplexing (OFDM) systems is proposed in this paper. Based on the generalized complex exponential basis expansion model (GCE-BEM), we describe the time-variant channel with time-invariant coefficients over multiple OFDM blocks. The time variation of channel destroys the orthogonality between subcarriers. The resulting channel matrix...
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