Brief description of the treatment of clinical by modulation of the sets of shells - codes for spreading a function of the cells addressed to the pharmaceutical, for a satellite communication multi - beams

摘要

A device (d) is dedicated to data processing by a coding by the spread spectrum for a satellite communication multi - beams (s), each beam (b1 - b6) is associated with a cell of the earth (c1 - c6) contained in a coverage area zc satellite (). This device (d) comprises coding means (mc) loaded i), on the one hand, of the sets of shells - spreading codes (j1 - j4), differing in pairs, to the adjacent cells of the zone (z) and of the signalling channels that are common to all the cells (c1 - c6) of this zone (z) and, on the other hand, of identical sets of shells - spreading codes to the cells are not adjacent to the zone, the clearances (j1 - j4) being chosen from among the play resulting from the subdivision of a set of the pseudo - spreading codes, and ii) when the data must be distributed in a cell (c1) and / or of the information data common to be broadcast in the set of cells, to modulate the pseudo - spreading codes (belonging to the clearance j1) associated with the cell (c1) with the data to be broadcast, and then to modulate a carrier, the frequency (f) is the same for all the beams (b1 - b6) of the satellite (s), with the pseudo - spreading codes modulated in order that the modulated carrier is diffused in the direction of the cell (c1) or of the assembly of the cells (c1 - c6) by means of the associated beam (b1).