U.S. Philips Corporation

Sabine Jourdan

Antoine Chouly

Americo Brajal

Philippe Decotignie

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.

Multi-user spread spectrum communication system

Device for processing digital signals constituted by image blocks and hierarchically arranged types of data. This device comprises an addressable memory (40) for storing said signals, a circuit (10) for counting, per section, the number of bits corresponding in these signals to each type of data, a circuit (20) for assigning, to each of the image sections and in accordance with a given proportion, the number of bits to be transmitted in channels of different priorities, and at the output of said circuits a control circuit (30) for redistributing the bits for each of the sections and in packets of given lengths comprising at least the first bits of a block and possibly the leftover bits of the other blocks. The invention also relates to the device for inverse processing at the receiver end.

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Savigny Sur Orge, France

Sabine Jourdan