Digital transmission system with predistortion
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United States of America Patent
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Jan 28, 1997
Grant Date -
N/A
app pub date -
Jun 28, 1994
filing date -
Jun 29, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
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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