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Channel estimation is a challenging problem in an Orthogonal frequency division multiplexing (OFDM) system, where is met with frequency-selective Rayleigh fading. The Poor man's Data Augmentation (PMDA) estimator is proposed to efficiently estimate the channel impulse response (CIR) making use of multipath fading channels with additive white Gaussian noise (AWGN). A modest number of pilot tones is used to efficiently improve the channel estimation by the use of the PMDA estimator to obtain the initial estimation for the iterative procedure. Using Cramer-Rao-like-lower (CRLB) estimator as the unbiased channel estimation criterion, simulation results illustrate that the bit error rate (BER) performance and the mean square error (MSE) performance estimated by the PMDA algorithm are better than those used by the EM estimator and reveals that the convergence of PMDA estimator is faster than the EM estimators.
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