Title :
Analysis of direct and indirect adaptive linear equalization for slowly varying channels
Author :
Wei, Yongbin ; Gelfand, Saul B. ; Krogmeier, James V.
Author_Institution :
Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA
fDate :
6/21/1905 12:00:00 AM
Abstract :
The coefficients of an equalizer can be adjusted to track the underlying channel variations either directly, or indirectly where the channel is first estimated, and the equalizer is then computed based on the channel estimate. In this paper, the performance of direct and indirect linear adaptive equalizers for slowly-varying channels with autoregressive (AR) coefficients is investigated. Explicit expressions are derived which characterize the performance of the equalizers. The results indicate that the indirect equalizer outperforms the direct equalizer. Simulations are conducted to verify the analytic results
Keywords :
adaptive equalisers; autoregressive processes; dispersive channels; least mean squares methods; time-varying channels; AR coefficients; LMS algorithm; adaptive linear equalization; autoregressive coefficients; direct equalizer; indirect equalizer; slowly varying channels; Adaptive equalizers; Analytical models; Application software; Channel estimation; Fading; Finite impulse response filter; Intersymbol interference; Least squares approximation; Mathematical model; Robustness;
Conference_Titel :
Global Telecommunications Conference, 1999. GLOBECOM '99
Conference_Location :
Rio de Janeireo
Print_ISBN :
0-7803-5796-5
DOI :
10.1109/GLOCOM.1999.830155