Alcatel Mobile Communication France

Alcatel Mobile Phones

Alain Chiodini

Vinod Kumar

Jacques Bursztejn

Jean-Marc Thienpont

The invention relates to a control signal for receivers, said control signal being formed by juxtaposing two signal elements of equal duration, and time symmetrical. For example, the signal comprises at least one first pseudo-random noise digital sequence s(N.sub.s -1) to s(0) and, periodically, at least one second digital sequence s(N.sub.s -1) to s(0), corresponding to the inverse, obtained by time symmetry, of said first sequence. The signal may be used in particular for performing time and frequency synchronization on receivers and/or for equalizing signals received by said receivers. The invention also relates to methods and apparatuses that use said signal.

Time symmetrical control signal, and a receiver and transmission system

Signalling packet for communication system with reference modulated in

For recognizing information conveyed by a received signal, represented by convention by possible elementary forms of the signal to be transmitted, a device includes a correlator for establishing a correlation between the received signal and various possible forms of signal, in accordance with the convention. A neural network using correlation coefficients obtained from the correlator is trained by application to its input of correlation coefficients corresponding to a received signal conveying given information whilst imposing the given information at its output. The network supplies recognized information.

Device for recognizing information conveyed by a received signal

A sectorized cell of a mobile radio network forms a first set which comprises a nucleus and a plurality of sectors disposed around the nucleus, the coverage of the cell being provided by transceiver units forming a second set, the first and second sets being associated on a one-to-one basis. Each sector comprising a core, at least one separation section being provided between the cores of two adjacent sectors, and the control station comprises an allocation unit capable of allocating the same resource to the cores of two adjacent sectors.

Control station for a sectorized cell of a mobile radio network

A positioning method for a mobile station in the radio coverage area of a satellite entails determining the instantaneous distance between the satellite and the mobile station. The instantaneous elevation angle .phi. of the satellite is then calculated from the instantaneous distance, the altitude of the satellite and the radius of the Earth. The Doppler shift .delta. is then determined, after which the angle .theta. between the projections onto the surface of the Earth of the track of the satellite and a straight line segment passing through the satellite and the mobile station is calculated from the Doppler shift .delta. and the instantaneous elevation angle .phi.. The location of the mobile station is then determined from the instantaneous distance, the instantaneous elevation angle .phi. and the angle .theta..

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Boulogne, France

Alain Chiodini