Pulse or digital communications – Equalizers
Patent
1992-04-06
1995-05-30
Chin, Stephen
Pulse or digital communications
Equalizers
36472419, H03H 730
Patent
active
054208840
ABSTRACT:
Disclosed is an automatic equalizer which, through a simple and inexpensive arrangement, performs precise equalization irrespective of timing phase error at the time of transmission. Specifically, there is provided an automatic equalizer for equalizing received data, which has a data transmission interval T, by a predetermined equalization characteristic, including a plurality of automatic equalizing units for performing equalization at different timings within the data transmission interval T. During training, the optimum automatic equalizing unit is found and this equalizing unit is used in subsequent data reception. Disclosed methods of finding the optimum automatic equalizing unit include a method of comparing equalization error signals with one another, and a method of comparing the error signals with a threshold value and using the automatic equalizing unit whose error signal in equal to or less than the threshold value. Disclosed methods of selection include a method of selecting a transversal filter and a method of selecting an equalized output. Also disclosed is a control algorithm for a case in which two automatic equalizing units are used as the preferred number of units. Complicated phase timing control is not required, and highly precise equalization with little equalization error can be carried out.
REFERENCES:
patent: 4245320 (1981-01-01), Desblache
patent: 4555788 (1985-11-01), Merrill
patent: 4567599 (1986-01-01), Mizogiuchi
patent: 4635276 (1987-01-01), Karabins
patent: 4797898 (1989-01-01), Martinez
Canon Kabushiki Kaisha
Chin Stephen
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