Title :
MLSE for CPM signals in a fading multipath channel
Author :
Zeger, Linda M. ; Kobayashi, Hisashi
Author_Institution :
Lucent Technol., USA
Abstract :
We perform sequence estimation for CPM signals transmitted in a time varying multipath channel. The EM (expectation-maximization) algorithm, an iterative procedure for producing maximum likelihood estimates, is applied to handle the unknown channel. In order to enable implementation of the EM algorithm in this system, a simplification of this algorithm is derived. Channel estimates derived from training data or estimates of previously transmitted information symbols are used initially. In subsequent iterations tentative estimates of current information symbols are used in addition to improve the channel estimates, which in turn improve sequence estimation. Simulation results of the simplified EM algorithm applied to GSM are presented
Keywords :
cellular radio; continuous phase modulation; fading channels; iterative methods; maximum likelihood sequence estimation; multipath channels; optimisation; time-varying channels; CPM signals; GSM; MLSE; channel estimates; expectation-maximization algorithm; fading multipath channel; iterative procedure; maximum likelihood estimates; sequence estimation; simplified EM algorithm; time varying multipath channel; training data; Fading; GSM; Gaussian noise; Iterative algorithms; Maximum likelihood estimation; Multipath channels; Performance analysis; Phase estimation; Phase noise; Training data;
Conference_Titel :
Communications, Computers and Signal Processing, 1999 IEEE Pacific Rim Conference on
Conference_Location :
Victoria, BC
Print_ISBN :
0-7803-5582-2
DOI :
10.1109/PACRIM.1999.799588
