Title :
Basis expansion models and diversity techniques for blind identification and equalization of time-varying channels
Author :
Giannakis, Georgios B. ; Tepedelenlioglu, Cihan
Author_Institution :
Dept. of Electr. Eng., Virginia Univ., Charlottesville, VA, USA
fDate :
10/1/1998 12:00:00 AM
Abstract :
The time-varying impulse response of rapidly fading mobile communication channels is expanded over a basis of complex exponentials that arise due to Doppler effects encountered with multipath propagation. Blind methods are reviewed for estimating the bases´ parameters and the model orders. Existing second-order methods are critiqued and novel algorithms are developed for blind identification, direct, zero-forcing equalization and minimum mean square error (MMSE) equalization by combining channel diversity with temporal (fractional sampling) and/or spatial diversity which becomes available with multiple receivers. Illustrative simulations are also presented
Keywords :
Doppler effect; adaptive equalisers; diversity reception; fading; identification; land mobile radio; least mean squares methods; multipath channels; radio receivers; signal sampling; statistical analysis; time-varying channels; Doppler effects; MMSE equalization; adaptive equalisation; algorithms; basis expansion models; blind equalization; blind identification; blind methods; channel diversity; complex exponentials; direct equalization; diversity techniques; fading mobile communication channels; fractional sampling; minimum mean square error; model orders; multipath propagation; multiple receivers; second-order methods; simulations; spatial diversity; temporal diversity; time-varying channels; time-varying impulse response; zero-forcing equalization; Blind equalizers; Diversity methods; Diversity reception; Doppler effect; Fading; Hidden Markov models; Mobile communication; Statistics; TV; Time-varying channels;
Journal_Title :
Proceedings of the IEEE
