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:
Aug. 23, 2005
Filed:
Dec. 06, 2001
Guy Harles, Fentange, LU;
Gerhard Bethscheider, Ayl, DE;
Guy Harles, Fentange, LU;
Gerhard Bethscheider, Ayl, DE;
SES Astra S.A., Betzdorf, LU;
Abstract
The invention refers to a method and an apparatus for determining characteristics of components of a communication channel. In order to simplify the intersystem coordination in a beginning of life test of a satellite communication channel and avoiding the interference of adjacent satellite systems the method according to the invention comprises the following steps: modulating a clean carrier signal f(t) by spread spectrum modulation to generate a spreaded clean carrier signal s(t); transmitting said spreaded clean carrier signal s(t) through said communication channel at a first predetermined level; receiving a receive signal s'(t) corresponding to said spreaded clean carrier signal s(t) after having traveled through said communication channel; demodulating said receive signal s′(t) by spread spectrum demodulation to generate a despreaded carrier signal f′(t); determining characteristics of components of the communication channel on the basis of a comparison of said clean carrier signal f(t) and said despreaded carrier signal f′(t).