Pulse or digital communications – Transmitters – Antinoise or distortion
Patent
1997-03-20
1999-05-18
Chin, Stephen
Pulse or digital communications
Transmitters
Antinoise or distortion
375296, 375297, 330149, H04K1/02
Patent
active
059057602
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 input complex signal or the predistorted complex signal has a phase which is constant modulo .pi. in the adaptation period.
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Faulkner et al. "Adaptive Linearisation Using Pre-distorsion", Proc. of the 40th IEEE Veh. Tech. Conf., 1990, pp. 35-40.
Peltier Jacques
Schnabl Gottfried
Chin Stephen
Liu Shuwang
Matra Communication
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