France Telecom

Groupe Des Eccles Des Telecommunications (enst Brentagne)

Joel Labat

Christophe Laot

Odile M Macchi

Patrick Vandamme

Dominique Leroux

The invention relates to a channel equalizing and decoding device consisting of a series of modules, each of which comprises an equalizer () and a decoder with weighted output (). The modules of rank higher than 1 receive (i) a sequence of samples coming from a sensor and delayed by a value equal to the processing time of preceding modules and (ii) the output from the preceding module. Said invention is characterized in that each of the modules comprises means for receiving at least two different sequences of samples and an equalizer that can determine one same equalized sequence of samples using the aforementioned minimum two sequences received as two different non-equalized representations of the sequence of samples to be determined.

Equalising and decoding device for frequency-selective channels

Adaptive equalizer for digital communications systems

The invention concerns a device for recovering a carrier wave provided with a circuit for inhibiting dummy frequency hookings or acquisitions for phase-modulated digital signals in N states with a phase N=2P, device including a phase locking loop provided with demodulation, a voltage-controllable oscillator, a 90.degree. phase shifter, for the low-pass filtering of basic band signals X1(t) and Y1(t), a loop filter, for sampling the signals X1(t) and Y1(t) and having a sampling frequency Fe so that Fe&gt;(2p+1.vertline.n.vertline.)/T where T is the reciprocal value of the modulation speed and, associated with this loop, a circuit for drawing up the filtered signals Sign Sin (2P .PHI.k) and Sign Cos (2P .PHI.k) required for detection of the direction of variation of the phase error, a phase/frequency comparator, loss of synchronization and hooking detection and an adaptive filter.

Device for recovering a carrier wave provided with a circuit for

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Plougastel Daoulas, France

Joel Labat