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. 26, 1982
Filed:
Jul. 07, 1980
Applicant:
Inventor:
Smith A Rhodes, Chantilly, VA (US);
Assignee:
Communications Satellite Corporation, Washington, DC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ; H03D / ;
U.S. Cl.
CPC ...
375 86 ; 375 85 ;
Abstract
In a TDMA burst preamble, the phase is varied between .+-..pi./4 radians, and carrier synchronization is achieved by averaging the phase over a given interval. Symbol timing synchronization is achieved by filtering the upper sideband of a conventional delay-and-multiply circuit and demodulating the filtered upper sideband with a coherent carrier available by the end of the preamble. After the preamble, modulation removal is used to obtain the unmodulated carrier.