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:
Jan. 25, 2005
Filed:
Apr. 22, 2003
Roberto Berezdivin, Great Falls, VA (US);
Robert J. Breinig, Fairfax, VA (US);
Allan R. Topp, Montclair, VA (US);
Scott Y. Seidel, Fairfax, VA (US);
Roberto Berezdivin, Great Falls, VA (US);
Robert J. Breinig, Fairfax, VA (US);
Allan R. Topp, Montclair, VA (US);
Scott Y. Seidel, Fairfax, VA (US);
Raytheon Company, Waltham, MA (US);
Abstract
In one embodiment, a method for generating an adaptive air interface waveform includes generating a waveform that includes a variable carrier frequency and variable bandwidth signal. The variable bandwidth signal includes one or more subcarriers that are dynamically placeable over a range of frequencies, and each subcarrier is separately modulated according to a direct sequence (DS) spread spectrum (SS) technique. The waveform has an embedded pilot usable to optimize one or more spectrum efficiencies of the waveform. A modulation constellation, a code rate, and a code length of the generated waveform are adapted according to an available spectrum and one or more sub-carrier conditions.