Title :
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
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;
Conference_Titel :
Vehicular Technology Conference, 1991. Gateway to the Future Technology in Motion., 41st IEEE
Conference_Location :
St. Louis, MO
Print_ISBN :
0-87942-582-2
DOI :
10.1109/VETEC.1991.140598
