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. 02, 2002
Filed:
Aug. 09, 2000
Ronald D. McCallister, Scottsdale, AZ (US);
Bruce A. Cochran, Mesa, AZ (US);
Bradley P. Badke, Chandler, AZ (US);
Sicom, Inc., Scottsdale, AZ (US);
Abstract
A constrained-envelope digital-communications transmitter circuit ( ) includes a binary data source ( ) that provides an input signal stream ( ) to a modulator ( ′). The modulator ( ′) includes a pulse-spreading filter ( ) that filters a phase-point signal stream ( ) or a composite signal stream ( ) into a modulated signal ( ). A constrained-envelope generator ( ) generates a constrained-bandwidth error signal stream ( ) from the modulated signal ( ), and a delay element ( ) delays the modulated signal ( ) into a delayed modulated signal ( ) synchronized with the constrained-bandwidth error signal stream ( ). A complex summing circuit ( ) sums the delayed modulated signal ( ) and the constrained-bandwidth error signal stream ( ) into an altered modulated signal ( ), and a substantially linear amplifier ( ) amplifies the altered modulated signal ( ) and transmits it as a radio-frequency broadcast signal ( ).