Fundamentals of statistical signal processing: estimation theory
Fundamentals of statistical signal processing: estimation theory
Microwave Mobile Communications
Microwave Mobile Communications
Polynomial spline-approximation of Clarke's model
IEEE Transactions on Signal Processing
Time-Variant Channel Estimation Using Discrete Prolate Spheroidal Sequences
IEEE Transactions on Signal Processing
Space-time decoding with imperfect channel estimation
IEEE Transactions on Wireless Communications
Iterative Channel Estimation Based on B-splines for Fast Flat Fading Channels
IEEE Transactions on Wireless Communications
IEEE Journal on Selected Areas in Communications
Robustness of joint Bayesian frequency offset and channel estimation based on basis expansion models
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
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In this paper, we derive an optimal detector for pilot-assisted transmission in Rayleigh fading channels with imperfect channel estimation. The classical approach is based on obtaining channel estimates and treating them as perfect in a minimum distance detector (this is called mismatched detector). The optimal detector jointly processes the received pilot and data symbols to recover the data. The optimal detector is specified for fast frequency-flat fading channels. We consider spline approximation of the channel gain time variations and compare the detection performance of different mismatched detectors with the optimal one. Further, we investigate the detection performance of an iterative receiver in a system transmitting turbo-encoded data, where a channel estimator provides either maximum likelihood estimates, minimum mean square error (MMSE) estimates or statistics for the optimal detector. Simulation results show that the optimal detector outperforms the mismatched detectors. However, the improvement in the detection performance compared to the mismatched detector with the MMSE channel estimates is modest.