Pulse or digital communications – Repeaters – Testing
Patent
1983-06-10
1985-11-12
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
455303, 333 18, H04B 314
Patent
active
045532486
ABSTRACT:
Bandpass filters are used to sample the output signal from the equalizer. These samples are amplified in variable gain amplifiers and summed with the input signal to achieve equalization. The amount of gain applied to each sample is based on the difference between each sample's magnitude and a reference signal. In one embodiment, the reference signal is derived from the adjacent bandpass sample. In another embodiment, one bandpass sample is the reference for comparison with all other samples. In the third embodiment, bandpass filters are also connected to the input signal in order to achieve a feed-forward rather than feedback configuration for the equalizer. In all of the embodiments, the magnitude signals from the bandpass samples are weighted before being compared to the reference signal. The weighting factors allow the filter to be designed for a desired transfer function and adapted to an input signal spectrum.
REFERENCES:
patent: 3750026 (1973-07-01), Watanabe
patent: 3851266 (1974-11-01), Conway
patent: 3875333 (1975-04-01), Nakano et al.
patent: 3904824 (1975-09-01), Caragliano et al.
patent: 3921072 (1975-11-01), Sato
patent: 3943468 (1976-03-01), Cox et al.
patent: 3978435 (1976-08-01), Luvison et al.
patent: 4003006 (1977-01-01), Mandeville et al.
patent: 4177356 (1979-12-01), Jaeger et al.
patent: 4251782 (1981-02-01), Bynum
patent: 4306306 (1981-12-01), Saenz
patent: 4467287 (1984-08-01), Aylward
R. W. Lucky, "Automatic Equalization for Digital Communication", Bell Sys. Tech. J., vol. 44, pp. 547-588, Apr. 1965.
R. W. Lucky, "Techniques for Adaptive Equalization of Digital Communication Systems", Bell Sys. Tech. J., vol. 45, pp. 255-286, Feb. 1966.
D. Hirsch & W. J. Wolf, "A Simple Adaptive Equalizer for Efficient Data Transmission", IEEE Trans. Commun., vol. Com-18, pp. 5-12, Feb. 1970.
D. A. George, R. R. Bowen, & J. R. Storey, "An Adaptive Decision Feedback Equalizer", IEEE Trans. Commun., vol. Com-19, pp. 281-293, Jun. 1971.
IBM Technical Disclosure Bulletin, "Bandpass Filter Using Differential Amplifier", G. L. Clapper, vol. 14, No. 3, pp. 815-816, Aug. 1971.
K. H. Mueller, "A New, Fast-Converging Mean-Square Algorithm for Adaptive Equalizers with Partial-Response Signaling", Bell Sys. Tech. J., vol. 54, pp. 143-153, Jan. 1975.
W. Schmidt, "An Automatic Adaptive Equalizer for Digital Data Transmission", 1978 IEEE Intern. Symp. of Circuits & Systems Proc. N.Y., pp. 436-440.
W. Rupprecht, "A Hybrid Adaptive Equalizer System for High Speed Digital Transmission", 1980 IEEE Intern. Symp. on Circuits & Systems Proc. N.Y., pp. 580-584.
International Business Machines - Corporation
Knearl Homer L.
Safourek Benedict V.
Wright Carl M.
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