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:
Dec. 07, 2004
Filed:
May. 12, 2000
Keith Charles Palermo, Higley, AZ (US);
Mike Francis Durkin, Cave Creez, AZ (US);
General Dynamics Decision Systems, Inc., Scottsdale, AZ (US);
Abstract
A signal calibrator ( ) for a software-defined communications device ( ) that enables device communications signals to be transmitted in a manner that maximally decouples the calibrator ( ) from the device hardware ( ), and that simplifies the design and reduces the cost of the communications device ( ). The calibrator ( ) includes a software modulator ( ) for generating a nonstop stream of samples including zero valued samples and non-zero valued waveform bursts, and a software demodulator ( ) connected to the software modulator ( ) via a closed loop feedback path ( ) that receives a nonstop stream of samples. The non-zero valued samples create radio emissions. The software demodulator ( ) is for determining a timing error of the transmission sample and for transmitting a timing error correction value to the software modulator ( ) via the closed loop feedback path ( ). The timing error correction value enables the software modulator ( ) to adjust a transmission time of a subsequent waveform burst to compensate for both unknown hardware delays and RF signal propagation delays.