Algorithm control method for blind equalization systems

Details Algorithm control method for blind equalization systems Algorithm control method for blind equalization systems

1994-06-02

1995-09-05

Chin, Stephen

Pulse or digital communications

Equalizers

Automatic

3647242, H03H 730

Patent

active

054486017

ABSTRACT:
A method for controlling algorithm conversion between the Godard algorithm and the decision-directed algorithm (DDA) is used in a blind equalization system for a digital communication receiver. The step size is varied while repeatedly performing the Godard algorithm. If a distance average value is smaller than a predetermined threshold value, the algorithm is converted into the DDA to calculate the equalization coefficient. If the distance average value is larger than another predetermined threshold value, the algorithm is converted into the Godard algorithm. Thus, the conversion between the Godard algorithm and the DDA and the step size alteration are adaptively performed according to a degree of convergency of the received signal, to obtain more quick and better equalization.

REFERENCES:
patent: 5119401 (1992-06-01), Tsujimoto
patent: 5311546 (1994-05-01), Paik et al.
"Self-Recovering Equalization and Carrier Tracking in Two-Dimensional Data Comm. Systems" by D. N. Godard, IEEE on Comm. 1980 pp. 1867-1875.
"Theory on the Speed of Convergence in Adaptive Equalizers for Digital Comm." by G. Ungerboeck, IBM Res. Develop. pp. 546-555, 1972.
"Bussgang Techniques for Blind Equalization" by Sandra Bellini IEEE 1986, pp. 1634-1640.
"Blind Equalizers" by Albert Benveniste, IEEE 1984 pp. 871-883.

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