Increasing Convergence Rate of a Fractionally-Spaced Channel Equalizer

In this paper a technique for increasing the convergence rate of fractionally spaced channel equalizer is proposed. Instead of symbol-spaced updating of the equalizer filter, a mechanism has been devised to update the filter at a higher rate. This ensures convergence of the equalizer filter at a higher rate and therefore less time-consuming. The proposed technique has been simulated and tested for two-ray modeled channels with various delay spreads. These channels include minimum-phase and nonminimum- phase channels. Simulation results suggest that that proposed technique outperforms the conventional technique of symbol-spaced updating of equalizer filter.

Authors:

• Waseem Khan

Keywords:

• Channel equalization
• Fractionally-spaced equalizer

References:

[1] Benedetto, S., Biglieri, E. and Castellani V. "Digital Transmission
Theory", Prentice Hall, 1987
[2] Qureshi, S. U. H and Forney, G. D., "Performance Properties of a T/2
Equalizer", IEEE Globecom,pp. 11.1.1-11.1.4, Los Angeles, CA,
December 1977.
[3] Gitlin, R. D., and Weinstein, S. B., "Fractionally Spaced Equalization: An
Improved Digital Transversal Filter", Bell Systems Technical Journal,
Vol. 60,pp. 275-296, February 1981.