To describe joint time- and frequency-selective channels in mobile broadband wireless communications, we propose to use the finite parameter model based on the same Bessel functions for each tap (Bessel model). An expression of channel estimation mean squared error (MSE) based on the finite parameter models in Orthogonal Frequency Division Multiplexing (OFDM) systems is derived. Then, our Bessel model is compared with commonly used finite parameter models in terms of the channel estimation MSE. Even if the channel taps have different channel correlations and some of the taps do not coincide with the Bessel function, the channel estimation MSE of the Bessel model is shown to be comparable or outperform the oversampled basis expansion model (OBEM), polynomial model (PM) and Slepian model as validated by simulations in typical suburban environment. The application of the Bessel model in an OFDM system also results in BER performance gain over OBEM, PM and Slepian model.
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