Method and apparatus for determining characteristics of...

Details Method and apparatus for determining characteristics of... Method and apparatus for determining characteristics of...

2005-08-23

2005-08-23

Chin, Stephen (Department: 2634)

Pulse or digital communications

Spread spectrum

C375S145000, C455S017000

Reexamination Certificate

active

06934314

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).

REFERENCES:
patent: 4637017 (1987-01-01), Assal et al.
patent: 5546421 (1996-08-01), Basile et al.
patent: 5799005 (1998-08-01), Soliman
patent: 6275678 (2001-08-01), Bethscheider et al.
patent: 6535546 (2003-03-01), Bethscheider et al.
patent: 3644175 (1988-07-01), None
patent: WO 99/33203 (1999-07-01), None
patent: WO 99/33204 (1999-07-01), None

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