Adaptive equalizer capable of compensating for carrier frequency

Details Adaptive equalizer capable of compensating for carrier frequency Adaptive equalizer capable of compensating for carrier frequency

1995-03-20

1996-03-12

Chin, Stephen

Pulse or digital communications

Equalizers

Automatic

375232, 375233, 375324, 375350, 3647242, 329307, H03H 730, H03H 740, H03K 5159

Patent

active

054992680

ABSTRACT:
An adaptive equalizer includes a multiplier for multiplying, by corrective data, an output signal from a filter unit for compensating for a signal distortion to which input digital data are subjected, a decision unit for estimating and outputting symbols of output data from the multiplier, a subtractor for subtracting an output signal of the decision unit from the output data from the multiplier, multipliers for inversely correcting the output signals from the decision unit and the subtractor which are corrected by the multiplier, a coefficient updating unit for updating the coefficients of the filter unit based on an output signal from the multiplier which inversely corrects the output signal from the subtractor, and a frequency offset estimating unit for estimating corrective data based on a frequency offset on the basis of the output signal from the multiplier which inversely corrects the output signal from the subtractor, and using the estimated corrective data as corrective data for the multiplier which multiplies the output signal from the filter unit by corrective data. An output signal from the multiplier which inversely corrects the output signal from the decision unit is fed back to a feedback filter of the filter unit.

REFERENCES:
patent: 4532640 (1985-07-01), Bremer et al.
patent: 4621366 (1986-11-01), Cain et al.
patent: 5153527 (1992-10-01), Yaguchi
patent: 5228062 (1993-07-01), Bingham
patent: 5297165 (1994-03-01), Ueda et al.
patent: 5311545 (1994-05-01), Critchlow
patent: 5311546 (1994-05-01), Paik et al.
NEC Research and Development, No. 45, Apr. 1977, Tokyo, Japan, pp. 38-49, Akashi et al., "A High Performance Digital QAM 9600 bit/s Modem".
Shahid U. H. Qureshi, Adaptive Equalization, Sep. 1985, pp. 1349-1387, Proceedings of the IEEE, vol. 73, No. 9, New York, U.S.A.

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