Direct and EM-based map sequence estimation with unknown time-varying channels

Author

Chen, H. ; Perry, R. ; Buckley, K.

Author_Institution

ECE Dept., Villanova Univ., PA, USA

Volume

4

fYear

2001

fDate

2001

Firstpage

2129

Abstract

We address sequence estimation when the intersymbol interference (ISI) communication channel is unknown and time varying. We employ a maximum a posteriori (MAP) approach, in which the unknown channel parameters are assigned a distribution and integrated out. For several channel models of interest we describe both the exact MAP estimator and Viterbi algorithm based implementations. We also present EM algorithms for solving these MAP sequence estimation problems, and we contrast these EM solutions with direct MAP algorithms

Keywords

digital communication; intersymbol interference; maximum likelihood sequence estimation; optimisation; time-varying channels; EM algorithms; ISI; MAP estimation; Viterbi algorithm; channel models; digital communication; intersymbol interference; maximum a posteriori estimation; parameter estimation; sequence estimation; time varying channel; unknown channel; Communication channels; Convergence; Finite impulse response filter; Integrated circuit modeling; Intersymbol interference; Maximum likelihood estimation; Parameter estimation; Signal processing algorithms; Time-varying channels; Viterbi algorithm;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01). 2001 IEEE International Conference on

Conference_Location

Salt Lake City, UT

ISSN

1520-6149

Print_ISBN

0-7803-7041-4

Type

conf

DOI

10.1109/ICASSP.2001.940414

Filename

940414