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This paper addresses time-domain channel estimation for pilot-symbol-aided Orthogonal Frequency Division Multiplexing (OFDM) systems. By using a cyclic sinc-function matrix uniquely determined by Nc transmitted subcarriers, the performance of proposed scheme approaches perfect Channel State Information (CSI), within a maximum of 0.4 dB degradation, regardless of the delay spread of the channel, Doppler frequency, and subcarrier modulation. Furthermore, reducing the matrix size by splitting the dispersive channel impulse response into clusters means that the Degenerated Inverse Matrix Estimator (DIME) is feasible for broadband, high-quality OFDM transmission systems.
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