Quadrature amplitude modulator with distortion compensation

Details Quadrature amplitude modulator with distortion compensation Quadrature amplitude modulator with distortion compensation

1992-03-11

1994-03-08

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375 60, 332107, H04L 2704

Patent

active

052934063

ABSTRACT:
A quadrature amplitude modulator capable of avoiding compensating the linear distortions completely and accurately by a simple configuration. The modulator includes a level signal generation unit for generating level signal for the modulated wave, and a parameter generation unit for determining appropriate values of linear transformation parameters of the linear transformation to be applied to the in-phase and quadrature amplitude input signals according to the level signal. In this modulator, the linear transformation parameters are determined sequentially in such an order that the linear transformation parameters for a DC off-set are determined first, then the linear transformation parameter for an amplitude balance is determined next while compensating distortion due to the DC off-set, and then the linear transformation parameter for an orthogonal phase relationship is determined while compensating distortions due to the DC off-set and the amplitude balance.

REFERENCES:
patent: 4700151 (1987-10-01), Nagata
patent: 5093637 (1992-03-01), Isota et al.
patent: 5148448 (1992-09-01), Karam et al.

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