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Blind channel and carrier frequency offset estimation using periodic modulation precoders

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4 Author(s)
Serpedin, E. ; Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA ; Chevreuil, A. ; Giannakis, G.B. ; Loubaton, P.

Previous results have shown that blind channel estimators, which are resilient to the location of channel zeros, color of additive stationary noise, and channel order overestimation errors, can be developed for communication systems equipped with transmitter-induced cyclostationarity precoders. The present paper extends these blind estimation approaches to the more general problem of estimating the unknown intersymbol interference (ISI) and carrier frequency offset/Doppler effects using such precoders. An all-digital open-loop carrier frequency offset estimator is developed, and its asymptotic (large sample) performance is analyzed and compared to the Cramer-Rao bound (CRB). A subspace-based channel identification approach is proposed for estimating, in closed-form, the unknown channel, regardless of the channel spectral nulls. It is shown that compensating for the carrier frequency offset introduces no penalty in the asymptotic performance of the subspace channel estimator. Simulations are presented to corroborate the performance of the proposed algorithms

Published in:

Signal Processing, IEEE Transactions on  (Volume:48 ,  Issue: 8 )

Date of Publication:

Aug 2000

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