Quadrature error reduction for QAM modulated up or down...

Details Quadrature error reduction for QAM modulated up or down... Quadrature error reduction for QAM modulated up or down...

2005-02-08

2005-02-08

Tran, Khai (Department: 2637)

Pulse or digital communications

Receivers

Angle modulation

Reexamination Certificate

active

06853692

ABSTRACT:
A compensation circuit for phase modulation systems, such as QPSK and QAM systems, which compensates for phase errors in the I and Q components of the QPSK or QAM signals to minimize carry over of such phase errors in analog up and down conversions of such signals. In particular, the invention relates to a relatively simple circuit, which compensates for channel phase errors by providing a direct correction of one of the channels based on the measured correlation between the I and Q components, which should ideally be 0. As such, cross talk between I-Q channels is minimized, which improves the signal-to-noise ratio of transmitted and received QPSK or QAM signals.

REFERENCES:
patent: 4086592 (1978-04-01), Lewis et al.
patent: 5307021 (1994-04-01), Ishizeki
patent: 6496229 (2002-12-01), Limberg

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