Pulse or digital communications – Repeaters – Testing
Patent
1990-10-09
1992-04-14
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
330149, 332107, H04L 2503
Patent
active
051054450
ABSTRACT:
Predistortion arrangement (9) for a digital transmission system transmits complex input data of a constellation by means of a modulator (14) and a power amplifier (15) which distorts the data. The arrangement comprising a predistortion circuit (11) which predistorts the input data in opposite sense before they pass through the amplifier and a transmit filter (10) which applies oversampled filtered data encoded with 2N bits to the predistortion circuit (11) at the rate k/T. The predistortion circuit (11) first determines approximate values of the predistorted data on the basis of a portion of 2M bits of the field of 2N bits (M<N), which data are thereafter revised with the aid of the remaining portion of said field. The predistortion circuit includes for each channel a memory (112) addressed by the field of M bits which produces the approximate values of the predistorted data and an interpolation circuit (111) which derives therefrom the revised predistorted data.
REFERENCES:
patent: 4291277 (1981-09-01), Davis et al.
patent: 4462001 (1984-07-01), Girard
patent: 4554514 (1985-11-01), Whartenby et al.
patent: 4675618 (1987-06-01), Cross
patent: 4700151 (1987-10-01), Nagata
Karam Georges
Sari Hikmet
Chin Stephen
Treacy David R.
U.S. Philips Corporation
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