Method and apparatus for predistortion of signals in digital tra

Details Method and apparatus for predistortion of signals in digital tra Method and apparatus for predistortion of signals in digital tra

1992-06-04

1994-06-28

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

307555, 375 58, 455114, H04L 2549

Patent

active

053254007

ABSTRACT:
A method and apparatus for predistorting digital signals so as to minimize radiation of harmonic signal energy during data transmission. The programmable waveshaping apparatus of the present invention is operative to predistort a binary encoded waveform to be transmitted over a transmission line. A pulse discriminator circuit is disposed to indicate the receipt of each pulse within an input sequence of short and long pulses included within the encoded waveform. Upon receipt of each short and long pulse an input logic network generates first and second sets of control signals, respectively. The logic network synthesizes the control signals based on information relating to sampled approximations of filtered versions of the short and long pulses. The inventive waveshaping apparatus further includes a programmable electrical source array for generating a sequence of line driving signals in accordance with each set of control signals. A transformer driver then pulses the transmission line in response to the driving signals in order to transmit information included within the encoded input sequence.

REFERENCES:
patent: 3980826 (1976-09-01), Widmer
patent: 4757519 (1988-07-01), Collison et al.
patent: 5157277 (1992-10-01), Tran et al.
patent: 5204880 (1993-04-01), Wurster et al.

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