Multi-user spread spectrum communication system
First Claim
Patent Images
1. 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.
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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.
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Citations
11 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4)
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5. 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:
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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. - View Dependent Claims (6, 7, 8, 9, 10)
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11. 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:
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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.
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Specification