Cramer-Rao bounds for semi-blind, blind and training sequence based channel estimation

de Carvalho, Elisabeth; Slock, Dirk T M

SPAWC 1997, 1st IEEE Signal processing advances in wireless communications workshop, April 16-18, 1997, Paris, France

Two channel estimation techniques are often opposed: training sequence based estimation in which a sequence of symbols known by the receiver is used and blind equalization in which the channel and/or the symbols are determined from the received signal only. The purpose of semi-blind techniques would be to adapt blind techniques in order to profit from the existence of a training sequence. A first approach to assess the performance of semi-blind methods is proposed. We study Cramer-Rao Bounds for blind, semi-blind and training-sequence based channel estimates for a deterministic as well as a Gaussian symbol model, and compare them theoretically as well as in numerical evaluations. Furthermore, an example of comparison between the corresponding maximum likelihood estimation methods is given

Detail

Document

DOI

BIBTEX

Type:

Conference

City:

Paris

Date:

1997-04-16

Department:

Communication systems

Eurecom Ref:

1782

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