Pulse or digital communications – Repeaters – Testing
Patent
1990-10-09
1992-05-12
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
330149, 332107, H04K 102, H04L 2503
Patent
active
051134144
ABSTRACT:
A 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) is formed from an encoder (20) transforming the filtered 2N-bit encoded data into data encoded with 2M bits (M<N) which address a memory (51) that stores complex predistortion coefficients, and a complex multiplier (52) that multiplies for each data element the 2N bits of the filtered data element by the selected predistortion coefficient for producing predistorted data.
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patent: 4462001 (1984-07-01), Girard
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patent: 4675618 (1987-06-01), Cross
patent: 4700151 (1987-10-01), Nagata
patent: 4908840 (1990-03-01), Kakimoto
Karam Georges
Moridi Said
Chin Stephen
Treacy David R.
U.S. Philips Corporation
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