Cartesian modulation system via multi-level pulse width...

Details Cartesian modulation system via multi-level pulse width... Cartesian modulation system via multi-level pulse width...

2007-01-18

2011-11-29

Vo, Don N (Department: 2611)

Pulse or digital communications

Pulse width modulation

Reexamination Certificate

active

08068540

ABSTRACT:
A system and method for Cartesian modulation achieved via generation of a three-level pulse width modulated signal. The system in overview comprises two binary pulse width modulated signal generators receiving signals related to the in-phase and quadrature components of a base-band signal and a combination and amplification stage that combines the signals provided by the two binary pulse width modulated signal generators. The binary pulse width modulated signal generators contain at least one signal comparator and at least one base-band pre-distortion element. The signals related to the in-phase and quadrature components of the base-band signal may be; the positive or negative parts of the in-phase component, the positive or negative parts of the quadrature component, the absolute value or sign of the in-phase component, or the absolute value or sign of the quadrature component. These signals may be distorted by a base-band pre-distortion element before being coupled to the comparators.

REFERENCES:
patent: 2005/0231410 (2005-10-01), Lee
patent: 2010/0097153 (2010-04-01), Rexberg et al.
patent: 02009381 (2002-01-01), None
Midya Pallab et al: “Quadrature Integral Noise Shaping for Generation of Modulated RF Signals”, Database Compendix [Online], Engineering Information Inc., New York, NY, USA; Database Accession No. E2003177449526 Abstract, Midwest Symp Circuits Syst; Midwest Symposium on Circuits and Systems 2002, vol. 2, 2002, p. II537-II540.

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