Fast communication: Bayesian Cramer-Rao bounds for complex gain parameters estimation of slowly varying Rayleigh channel in OFDM systems

Authors:
Hussein Hijazi;Laurent Ros
Affiliations:
GIPSA-lab, Image and Signal Department, BP 46, 38402 Saint Martin d'Hères, France;GIPSA-lab, Image and Signal Department, BP 46, 38402 Saint Martin d'Hères, France
Venue:
Signal Processing
Year:
2009

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Abstract

This paper deals with on-line Bayesian Cramer-Rao (BCRB) lower bound for complex gains dynamic estimation of time-varying multi-path Rayleigh channels. We propose three novel lower bounds for 4-QAM OFDM systems in case of negligible channel variation within one symbol, and assuming both channel delay and Doppler frequency related information. We derive the true BCRB for data-aided (DA) context and, two closed-form expressions for non-data-aided (NDA) context.