Stmicroelectronics S.a.

Jean-Marc Brossier

Frédéric Lehmann

Thierry Lenez

A method for estimating the phase in a digital communication system, comprising the steps of: Each PLL provides an intermediate value, combining both intermediate values makes it possible to provide a sharpened phase estimate. The method allows realization of an improved phase estimator based on the simplicity of phase locked loops.

Phase estimation method in a digital and phase locked loop communication system

A receiver for a digital data transmission device for receiving a digital signal and comprising a free sampler physically taking samples rof a received signal r(t) at a frequency at least equal to twice the received signal spectrum maximum frequency. A digital interpolator allows to derive a sequence of samples Xcalculated from said physical samples, according to a tuning parameter &#x3c4;. An equalizer adjustable to a set of equalization parameters e allows to process said interpolator output samples X. A computing unit simultaneously provides, in a single processing, values of &#x3c4; to the digital interpolator and values of the equalization parameters e to the digital equalizer. The invention also provides a method for digitally processing a received signal in a digital transmission device.

Synchronization and equalization device for a digital transmission system receiver

A modulation process for a digital transmission system having an error correcting code and determination of the number of bits to load on a transmission channel. The process judiciously associates a coder for introducing redundancy to the binary information, an interleaver for suppression the correlation to the encoded information and a labeling of the same based on a GRAY type coding in order to associate the said binary information with points of a constellation which is selected among a predetermined set of constellations. The process achieves a precise determination of the order and size of the constellation to utilize and, therefore, the computation of the bit loading as a function of the signal to noise ratio measured in reception and as a function of the bit error rate Pat the output of the receiver. The process is well adapted to the Multi Tone transmission system, and to the use of turbo codes.

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Saint Martin d'Heres, France

Jean-Marc Brossier