Pulse or digital communications – Transmitters – Antinoise or distortion
Patent
1997-03-20
1999-05-11
Chin, Stephen
Pulse or digital communications
Transmitters
Antinoise or distortion
375297, 375296, 375298, 455 63, 455126, H04K1/02
Patent
active
059036117
ABSTRACT:
In order to correct nonlinearities of an amplifier which receives a radio signal and produces an amplified radio signal representing an input complex digital signal, a predistortion table, associating a value of a predistorted complex digital signal with each value of the input complex digital signal, is stored, and the predistorted complex signal is modulated in order to obtain the radio signal addressed to the amplifier. In an adaptation period, a fraction of the amplified radio signal is demodulated in order to obtain a demodulated complex signal which is compared with the input complex signal, with which the predistorted complex signal modulated in said adaptation period is associated, in order to update the predistortion table. The predistortion table is updated on the basis of mean values calculated from blocks of samples of the input complex signal and of the demodulated complex signal, which are stored in the adaptation period.
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Peltier Jacques
Schnabl Gottfried
Chin Stephen
Maddox Michael W.
Matra Communication
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