Title :
EM algorithms for sequence estimation over random ISI channels
Author :
Perry, Richard ; Berger, W. Andrew ; Buckley, Kevin
Author_Institution :
Villanova Univ., PA, USA
Abstract :
This paper presents a new approach using EM (expectation-maximization) algorithms for ML (maximum likelihood) sequence estimation over unknown ISI (inter-symbol interference) channels with random channel coefficients. By using the EM formulation to marginalize over the channel coefficient distribution, maximum-likelihood estimates of the transmitted sequence are obtained. The EM algorithms are shown to perform better, in terms of BER, than existing algorithms which perform jointly-optimal sequence and channel estimation.
Keywords :
digital communication; error statistics; intersymbol interference; maximum likelihood sequence estimation; optimisation; random processes; telecommunication channels; BER; EM algorithms; MLSE; channel coefficient distribution; expectation-maximization; intersymbol interference; maximum likelihood sequence estimation; maximum-likelihood estimates; optimal channel estimation; optimal sequence estimation; random ISI channels; random channel coefficients; transmitted sequence; Bit error rate; Channel estimation; Digital communication; Finite impulse response filter; Intersymbol interference; Iterative algorithms; Iterative methods; Maximum likelihood estimation; Training data; Viterbi algorithm;
Conference_Titel :
Signals, Systems, and Computers, 1999. Conference Record of the Thirty-Third Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-7803-5700-0
DOI :
10.1109/ACSSC.1999.832340
