Baseband time-domain communications system

Details Baseband time-domain communications system Baseband time-domain communications system

2008-01-22

2008-01-22

Ahn, Sam K. (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

Reexamination Certificate

active

07321641

ABSTRACT:
A communications system reduces downconverter inaccuracies in time-domain measurements or samples of received microwave communications I and Q complex signals by converting received signal to baseband taking measurements or samples of the I and Q waveforms at differing phase shifts of a demodulating carrier signal for a local oscillator or carrier tracking loop used during downconversion so that I and Q imbalances may be detected and removed by lowpass equivalent averaging for improved characterization of downconverters or for improved signal reception. In the preferred form, the phase shifts are 0 and π/2 for a conventional measurement, and then at θ, and θ+π/2, with θ=π/4+mπ/2 for an integer m for the second measurement where I and Q imbalances and baseband nonlinearities are indicated by differences between the two measured or sampled signals, where θ provides for optimum error detection for reducing the errors by averaging the measurements.

REFERENCES:
patent: 6330290 (2001-12-01), Glas
patent: 2004/0190479 (2004-09-01), Deane et al.

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