Thales

Jacques Eudes

Marc Touret

Jullien Pailler

The method of transmission between a transmitter and a receiver using a mode of adaptive modulation and coding, wherein the modulation and coding are selected based on the comparison of a characteristic variable of the signal to noise ratio measured by the receiver with a threshold value plus a margin, which margin is variable depending on the prior change in the signal to noise ratio. The margin changes based on a statistical function of a higher order than 1 of the characteristic variable of the signal to noise ratio measured by the receiver over at least one time horizon.

Method of transmission with mechanism for adapting modes of coding and of dynamic range modulation

Disclosed is a method of improving iterative decoding of short codes within a demodulator. The vector of metrics of the bits considered at the output of the demodulator is decoded. The value of the check code of the CRC of the decoded word is compared with a predetermined value. If the value of the CRC is considered to form an acceptable message for the decoding step, the decoded word is transmitted to the recipient. If the value of the CRC is incompatible with a correctly decoded message, then the parameters for iterative decoding of the initial message are modified that were received from the demodulator and executing at least one new iterative decoding step with these new parameters.

Method of improving the iterative decoding of codes

Method and device for modulating a signal comprising data symbols and reference symbols, characterized in that it comprises at least one step () wherein semi-pilot symbols are introduced that transport less information than the symbols customarily used but enough to obtain decisions decided during a decoding step (), the semi-pilot symbols being disposed between the data symbols and the reference symbols.

Modulation method with insertion of semi-pilot symbols

In a method and device to demodulate a signal in a packet communications system, the signal comprises at least one burst representing data samples relative to one or more users. The method comprises at least one step of phase estimation and tracking during at least the duration of the burst in using a frequency assumption test.

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Asnieres, France

Jacques Eudes