Device and Method for Processing Data by Modulating Sets of Spreading Pseudocodes as a Function of Data Destination Cells for a Multi-Beam Communication Satellite
First Claim
1. A device for processing data by spread spectrum coding for a communication network, having;
- at least one multi-beam communication satellite, each beam being associated with a terrestrial cell contained in a satellite coverage zone, comprising;
coding means designed i) to associate, sets of pseudo-spreading codes, differing pairwise, with adjacent cells of said zone and with signalling channels common to the collection of said cells of the zone, identical sets of pseudo-spreading codes with non-adjacent cells of said zone, said sets being chosen from among sets resulting from the subdivision of a collection of pseudo-spreading codes, and ii) in the event of data to be broadcast in a cell and/or of common information data to be broadcast in the collection of said cells of the zone, to modulate pseudo-spreading codes belonging to the set associated with this cell with said data to be broadcast, then to modulate a carrier, whose frequency is the same for all said beams of the satellite, with said modulated pseudo-spreading codes so that the modulated carrier is broadcast towards said cell or the collection of said cells by means of the associated beam.
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Abstract
A device (D) is dedicated to the processing of data by spread spectrum coding for a multi-beam communication satellite (S), each beam (B1-B6) of which is associated with a terrestrial cell (C1-C6) contained in a satellite coverage zone (ZC). This device (D) comprises coding means (MC) charged i) with associating, on the one hand, sets of pseudo-spreading codes (J1-J4), differing pairwise, with adjacent cells of the zone (ZC) and with signalling channels common to the collection of cells (C1-C6) of this zone (ZC), and on the other hand, identical sets of pseudo-spreading codes with non-adjacent cells of the zone, the sets (J1-J4) being chosen from among sets resulting from the subdivision of a collection of pseudo-spreading codes, and ii) when data have to be broadcast in a cell (C1) and/or common information data have to be broadcast in the collection of cells, with modulating pseudo-spreading codes belonging to the set (J1) associated with this cell (C1) with the data to be broadcast, then with modulating a carrier, whose frequency (f) is the same for all the beams (B1-B6) of the satellite (S), with the modulated pseudo-spreading codes so that the modulated carrier is broadcast towards the cell (C1) or the collection of cells (C1-C6) by means of the associated beam (B1).
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16 Claims
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1. A device for processing data by spread spectrum coding for a communication network, having;
- at least one multi-beam communication satellite, each beam being associated with a terrestrial cell contained in a satellite coverage zone, comprising;
coding means designed i) to associate, sets of pseudo-spreading codes, differing pairwise, with adjacent cells of said zone and with signalling channels common to the collection of said cells of the zone, identical sets of pseudo-spreading codes with non-adjacent cells of said zone, said sets being chosen from among sets resulting from the subdivision of a collection of pseudo-spreading codes, and ii) in the event of data to be broadcast in a cell and/or of common information data to be broadcast in the collection of said cells of the zone, to modulate pseudo-spreading codes belonging to the set associated with this cell with said data to be broadcast, then to modulate a carrier, whose frequency is the same for all said beams of the satellite, with said modulated pseudo-spreading codes so that the modulated carrier is broadcast towards said cell or the collection of said cells by means of the associated beam. - View Dependent Claims (2, 3, 4, 5, 11, 12, 13, 14, 15)
- at least one multi-beam communication satellite, each beam being associated with a terrestrial cell contained in a satellite coverage zone, comprising;
- 6. A method for processing data by spread spectrum coding, for a communication network comprising at least one multi-beam communication satellite, each beam being associated with a terrestrial cell contained in a satellite coverage zone, comprising i) in associating, sets of pseudo-spreading codes, differing pairwise, with adjacent cells of said zone and with signalling channels common to the collection of said cells of the zone, and identical sets of pseudo-spreading codes with non-adjacent cells of said zone, said sets being chosen from among sets resulting from the subdivision of a collection of pseudo-spreading codes, ii) in allocating one and the same chosen carrier frequency to each of said beams of the satellite, and iii) in the event of data to be broadcast in a cell and/or of common information data to be broadcast in the collection of said cells of the zone, in modulating pseudo-spreading codes belonging to the set associated with this cell with said data to be broadcast and in modulating said carrier of chosen frequency with said modulated pseudo-spreading codes so that the modulated carrier is broadcast towards said cell or the collection of said cells.
Specification