Title :
Channel tracking for multiple input, single output systems using EM algorithm
Author :
Aldana, Carlos H. ; Cioffi, John
Author_Institution :
STAR Lab., Stanford Univ., CA, USA
Abstract :
This paper investigates the problem of blindly acquiring the channel gains for a synchronized multiuser system using the expectation maximization (EM) algorithm. The EM algorithm takes advantage of the finite alphabet property of the transmitted signal. It also provides MMSE estimates of the transmitted data that can be used by the receiver for decoding purposes. The algorithm has been applied to a multicarrier system and results show that the application of EM in the high SNR case provides significant improvement over traditional channel estimation techniques
Keywords :
decoding; least mean squares methods; maximum likelihood estimation; multi-access systems; multiuser channels; optimisation; radio tracking; synchronisation; EM algorithm; MLE; MMSE estimates; channel estimation; channel gain; channel tracking; decoding; expectation maximization algorithm; finite alphabet property; high SNR; maximum likelihood estimation; multicarrier system; multiple input single output systems; receiver; synchronized multiuser system; transmitted data; transmitted signal; wireless channel; Additive white noise; Bandwidth; Base stations; Central office; Channel estimation; Crosstalk; Gaussian noise; Intersymbol interference; Maximum likelihood estimation; Transmitters;
Conference_Titel :
Communications, 2001. ICC 2001. IEEE International Conference on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-7097-1
DOI :
10.1109/ICC.2001.937007
