Decision directed algorithm control method

Pulse or digital communications – Equalizers – Automatic

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375229, 3647242, H03H 730

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055374395

ABSTRACT:
A method for adaptively turning on or off a decision directed algorithm (DDA) is performed according to the convergence state of the data to be equalized in a blind equalization system for use in a digital communication receiver. Each quadrant of a two-dimensional plane having an I-axis and Q-axis is divided into two decision areas. Then, a sign pair of actual error estimation data is calculated with respect to each area. If the decision error of the received symbol data is calculated, it is determined whether the sign of the decision error coincides with that of the actual error estimation data. The DDA is performed with respect to the symbol data of which the sign coincides with each other to update the equalization coefficient. The method further reduces the number of decision areas for dividing the plane formed by the I-axis and Q-axis in which the symbol data is arranged, to permit faster convergence speed and to further suppress the ratio of the symbol error.

REFERENCES:
patent: 5263033 (1993-11-01), Seshadri
patent: 5311546 (1994-05-01), Paik et al.
Choi et al. "Adaptive Blind Equalization Coupled With Carrier Recovery for HOTY Modem" IEEE vol. 39 Aug. 93.
Picchi et al. "A Blind SAG-SO-DFD-FS Equalizer" IEEE 1988 pp. 0957-0960.

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