Multi-user spread spectrum communication system
AssigneeU.S. Philips Corporation
InventorsAntoine Chouly, Americo Brajal, Sabine Jourdan
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Abstract
Multi-user communication system which combines means that implement the spread spectrum coding technique SSC with means that implement the modulation technique of orthogonal frequency-division multiplexing OFDM. This makes it possible to inhance the performance of the SSC system by simplifying certain data processing and data acquisition mechanisms. A preferred use is the use in telephone communication systems between mobile stations and base stations.
Claims11
A multi-user communication system including at least one base transceiver station and a plurality of user transceiver stations for communicating a message via a plurality of carriers via said base transceiver station, said system comprising:
- a first transforming circuit for transforming said message into symbols of a constellation;
- a coding circuit coupled to said first transforming circuit for coding said symbols with a code by spread spectrum coding;
- a transmitting circuit for transmitting said coded symbols by modulating by orthogonal frequency-division multiplexing;
- a receiving circuit for receiving said coded symbols by demodulating by orthogonal frequency-division demultiplexing;
- a decoding circuit for decoding said demodulated coded symbols;
- and
- a second transforming circuit for transforming said symbols into said message.
A base transceiver station for transmitting a message to a plurality of user transceiver stations via a plurality of carriers, said base transceiver station comprising:
- a first transforming circuit for transforming said message into symbols of a constellation;
- a coding circuit coupled to said first transforming circuit for coding said symbols with a code by spread spectrum coding;
- and
- a transmitting circuit for transmitting said coded symbols by modulating by orthogonal frequency-division multiplexing.
A base transceiver station for receiving messages transmitted by a plurality of user transceiver stations as coded symbols via a plurality of carriers, said base transceiver station comprising:
- a receiving circuit for receiving said coded symbols by demodulating by orthogonal frequency-division demultiplexing;
- a decoding circuit for decoding said demodulated coded symbols;
- and
- a second transforming circuit for transforming said symbols into said message.
Dependencies are inferred from the claim text.