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:
Apr. 22, 2008
Filed:
May. 18, 2005
Asad U. Aman, Schaumburg, IL (US);
Thomas J. Kundmann, Cary, IL (US);
Gregory T. Nash, Arlington Heights, IL (US);
Asad U. Aman, Schaumburg, IL (US);
Thomas J. Kundmann, Cary, IL (US);
Gregory T. Nash, Arlington Heights, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A programmable modulator () is programmable to operate in either of a GMSK or 8PSK mode. When operating in a GMSK mode, a signal modulating circuitreceives () a bit stream (), maps the bit stream () to a phase value in complex I, Q form and applies a progressive rotation to the phase value according to GMSK specifications. The output () is filtered by a filter circuit (), preferably using a complex Finite Impulse Response (FIR) filter using the standard coefficients for an 8PSK modulation to create () an approximate GMSK output (). A GMSK correction circuit () determines a correction term that is added to the filter circuit output () so as to correct amplitude variations to allow the output to conform to GSM/EDGE standards. The same modulator () may be programmed to operate in an 8PSK mode with linear predistortion.