A Robust Hybrid NDA Estimation Technique for SNR Estimation in OFDM System
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Channel Estimation techniques play a very crucial role in characterizing the effect of the physical medium on the input sequence. Orthogonal Frequency division multiplexing (OFDM) Systems are especially suited for channel estimation. In this paper we have proposed a novel robust blind channel estimation technique. This technique is developed on the basis of the Envelope Based Estimator. A hybrid approach based on EM and simpler moments-based techniques is adopted. Modified moments based estimator is designed for this proposed work. In the adopted hybrid approach the SNR is estimated by the moments based estimators up to a certain threshold point, ρ0. EM estimator is used to estimate SNR greater than ρ0. Since the Phase Noise is a time varying process which changes the symbol from time to time and has a high deteriorating effect on higher order OFDM system. We have derived a Bayesian Cram´er- Rao Lower Bound Estimator for estimating phase noise.
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