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. 18, 2007
Filed:
Jul. 11, 2005
Susan M. Jarvis, Westport, MA (US);
Fletcher A. Blackmon, Forestdale, MA (US);
Ronald R. Morrissey, Randolph, MA (US);
Nixon Pendergrass, Nashville, IN (US);
Dean J. Smith, Dover-Foxcroft, ME (US);
Kevin C. Fitzpatrick, Suwanee, GA (US);
Susan M. Jarvis, Westport, MA (US);
Fletcher A. Blackmon, Forestdale, MA (US);
Ronald R. Morrissey, Randolph, MA (US);
Nixon Pendergrass, Nashville, IN (US);
Dean J. Smith, Dover-Foxcroft, ME (US);
Kevin C. Fitzpatrick, Suwanee, GA (US);
The United States of America represented by the Secretary of the Navy, Washington, DC (US);
Abstract
An undersea communications system in which a message is converted to a redundant fixed-length data packet and transmitted acoustically as a quadrature phase-keyed signal in a frequency band with a continuous pilot signal at a frequency closely adjacent to the frequency band. A receiver uses the received continuous pilot signal to Doppler compensate the incoming quadrature phase keyed signal by estimating any Doppler distortion in the received pilot signal. The resultant redundant signals are then robustly processed coherently and jointly by the adaptive decision feedback equalizer and decoder to provide the original transmitted data.