Degenerated-inverse-matrix-based channel estimation for OFDM systems

This paper addresses time-domain channel estimation for pilot-symbol-aided orthogonal frequency division multiplexing (OFDM) systems. By using a cyclic sine-function matrix uniquely determined by N_c transmitted subcarriers, the performance of our 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. In addition, 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. Computer simulations over realistic non-sample spaced channels also showed that the DIME is robust for inter-symbol interference (ISI) channels and fast time-invariant channels where a minimum mean squared error (MMSE) estimator does not work well.