Method and apparatus for determining characteristics of...

H - Electricity – 04 – B

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H04B 17/00 (2006.01) H04B 7/185 (2006.01)

Patent

CA 2375846

The invention refers to a method and an apparatus for determining characteristics of components of a communication channel. In order to simplify the inter-system 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).

L'invention concerne un procédé et un appareil pour déterminer les caractéristiques de composants d'une voie de transmission. En vue de simplifier la coordination inter-système au début d'un test de vie d'une voie de transmission par satellite et d'éviter les interférences de systèmes satellites adjacents, le procédé selon l'invention est caractérisé en ce qu'il comprend les étapes suivantes : modulation d'un signal de porteuse indépendant f(t) par modulation par étalement du spectre, en vue de produire un signal de porteuse indépendant étalé s(t) ; transmission du signal précité s(t) à travers ladite voie de transmission, à un premier niveau prédéterminé ; réception d'un signal reçu s'(t) correspondant audit signal de porteuse indépendant étalé s(t) ayant circulé à travers ladite voie de transmission ; démodulation dudit signal reçu s'(t) par démodulation par étalement du spectre, en vue de produire un signal de porteuse désétalé f'(t) ; détermination des caractéristiques de composants de la voie de transmission sur la base d'une comparaison dudit signal de porteuse indépendant f(t) et dudit signal de porteuse désétalé f'(t).

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