A comparative study of two adaptive equalizers for mobile radio

Author

Huang, Weifeng ; Rappaport, Theodore S.

Author_Institution

Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA

fYear

1991

fDate

19-22 May 1991

Firstpage

765

Lastpage

769

Abstract

Adaptive equalization techniques designed to improve bit error rates (BERs) degraded by multipath propagation in mobile communication systems are addressed. Two kinds of equalizers are used in a simulation: the adaptive lattice decision feedback equalizer (L-DFE) and maximum-likelihood sequence estimation (MLSE). RLS (recursive-least-squares) algorithms are used to update the equalizers. The choices are based on the fact that a DFE has little noise enhancement and a RLS algorithm converges fast and has good tracking capability. The sensitivities of these equalizers to receiver velocity and signal-to-noise ratio are tested for a two-ray multipath channel where the ratio of powers of the rays can vary. Results show that these two kinds of equalizers have similar performances

Keywords

equalisers; mobile radio systems; telecommunication channels; L-DFE; MLSE; adaptive equalizers; adaptive lattice decision feedback equalizer; bit error rates; maximum-likelihood sequence estimation; mobile radio; multipath propagation; receiver velocity; recursive least squares algorithm; signal-to-noise ratio; tracking capability; two-ray multipath channel; Adaptive equalizers; Bit error rate; Decision feedback equalizers; Degradation; Land mobile radio; Lattices; Maximum likelihood estimation; Mobile communication; Resonance light scattering; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1991. Gateway to the Future Technology in Motion., 41st IEEE

Conference_Location

St. Louis, MO

ISSN

1090-3038

Print_ISBN

0-87942-582-2

Type

conf

DOI

10.1109/VETEC.1991.140598

Filename

140598