Title :
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
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;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01). 2001 IEEE International Conference on
Conference_Location :
Salt Lake City, UT
Print_ISBN :
0-7803-7041-4
DOI :
10.1109/ICASSP.2001.940414
