The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 11, 2005
Filed:
Jun. 11, 2002
Rüdiger Bauernschmitt, Linkenheim-Hochstetten, DE;
Gerd Wölfle, Gärtringen, DE;
Rüdiger Bauernschmitt, Linkenheim-Hochstetten, DE;
Gerd Wölfle, Gärtringen, DE;
Alcatel, Paris, FR;
Abstract
An improved method of predistorting a transmit signal is disclosed whereby the distortions occurring in all nonlinear subassemblies are compensated for using a particularly suited feedback signal. Also disclosed are a transmitter, a transmitting station, and a communications system using the method. The transmit signal, before being converted to the desired radio frequency, is digitally predistorted at baseband by digital signal processing means which are controlled by the feedback signal. This signal is generated by a detector measuring the spectral power of the transmit signal at the desired radio frequency both within a first frequency range, which lies within the transmission spectrum, and within a second frequency range, which lies outside the transmission spectrum. The digital predistortion disclosed is flexibly parameterized and is adapted by the feedback control to the current behavior of the transmitter subassemblies.