Method of correcting nonlinearities of an amplifier, and radio t

Details Method of correcting nonlinearities of an amplifier, and radio t Method of correcting nonlinearities of an amplifier, and radio t

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.

REFERENCES:
patent: 5066923 (1991-11-01), Gaillus et al.
patent: 5093637 (1992-03-01), Isota et al.
patent: 5111155 (1992-05-01), Keate et al.
patent: 5113414 (1992-05-01), Karam et al.
patent: 5420536 (1995-05-01), Faulkner et al.
patent: 5650758 (1997-07-01), Xu et al.
Faulkner et al. "Adaptive Linearisation Using Pre-distorsion", Proc. of the 40th IEEE Veh. Tech. Conf., 1990, pp. 35-40.

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