Method and apparatus for switching spread spectrum/code...

H - Electricity – 04 – Q

Patent

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Details

H04Q 11/00 (2006.01) H04B 7/216 (2006.01) H04B 1/69 (2006.01)

Patent

CA 2197129

Switching of traffic channels within spread spectrum beams is performed in a satellite without buffering of the individual signals. Individualsatellite beams carrying spread spectrum user RF signals from a plurality of customer premise equipments are received by radio receivers of a satellite switch and downconverted to IF signals. Traffic channel recovery is performed immediately after the down conversion and digital encoding and decoding is performed to route each channel to an appropriate outbound satellite beam. Traffic channel recovery is by despreading and filtering followed by respreading to uniquely identify each user signal so it may be recovered at its end destination. Furtherspreading uniquely identifies the user signal with an outbound satellite beam going to the intended destination of the user signal.

La commutation des canaux de trafic dans les faisceaux à spectre étalé est effectuée dans un satellite sans mise en mémoire tampon des signaux individuels. Les divers faisceaux des satellites qui transmettent les signaux RF à spectre étalé provenant d'une pluralité d'installations d'abonné sont reçus par les récepteurs radio d'un commutateur de satellite et sont convertis en signaux FI avec abaissement de fréquence. Le recouvrement des signaux transmis par le canal est effectué immédiatement après la conversion et un codage et un décodage numériques sont effectués pour transmettre les signaux de chaque canal sur un faisceau approprié émis par le satellite. Le recouvrement des signaux transmis par le canal se fait par un désétalement et un filtrage suivis par un réétalement pour identifier chaque signal d'utilisateur en vue de le recouvrer à sa destination après sa transmission sur le faisceau du satellite.

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