Pulse or digital communications – Transmitters – Antinoise or distortion
Patent
1994-06-28
1997-01-28
Chin, Stephen
Pulse or digital communications
Transmitters
Antinoise or distortion
375260, 375285, 370207, 330284, H04K 102
Patent
active
055984363
ABSTRACT:
Digital signal transmission system operating with constellation coding, the system comprising an orthogonal frequency-division multiplexing modulation unit which generates multicarrier signals, and an amplifier which causes signal distortion. The system comprises a predistortion circuit inserted between the multicarrier modulation unit and the amplifier, the circuit predistorting the multicarrier signals received on an input, in opposite sense to distortions created by the amplifier, and generating predistorted multicarrier signals so that, after the predistorted multicarrier signals passing through the amplifier, the amplifier delivers undistorted multicarrier signals. The system may operate in the fixed mode or in the adaptive mode.
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"Adaptive Linearization of Power Amplifiers in Digital Radio Systems" A.A.M. Saleh et al, Bell System Technical Journal vol. 62 (1983) pp. 1019-1033.
Brajal Americo
Chouly Antoine
Chin Stephen
Le Amanda T.
U.S. Philips Corporation
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