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:
Aug. 02, 2005
Filed:
Jul. 31, 1998
Klaus Huber, Darmstadt, DE;
Klaus Huber, Darmstadt, DE;
Deutsche Telekom AG, Bonn, DE;
Abstract
A method and a circuit arrangement for efficient use of multistage modulation methods using orthogonal base functions for the representation of a signal to be transmitted. Signal points of a signal constellation are selected according to a respective predetermined and/or selected probabilities so as to optimize a respective signal energy and/or a respective signal data rate, the selected signal points each having a defined respective energy. A 16-QAM signal constellation can be used, for example, for transmitting at low data rates. In the circuit arrangement, a source () which supplies a data stream () and is connected to a code converter () for converting the data stream. The output of the code converter () is connected to a modulator () in which the corresponding signal points are selected according to the respective probabilities. The data stream () is then transmitted over a channel (), and a demodulator () situated downstream from a code converter () carries out the inverse operation.