Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: Method and device for modulating a signal comprising data symbols and reference symbols, characterized in that it comprises at least one step (3) 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 (9), the semi-pilot symbols being disposed between the data symbols and the reference symbols.

Abstract: Method and device for modulating a signal comprising data symbols and reference symbols, characterized in that it comprises at least one step (3) 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 (9), the semi-pilot symbols being disposed between the data symbols and the reference symbols.

Abstract: 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.

Abstract: 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.

Abstract: The invention relates notably to a method for transmitting frames on a radio communication channel (RCC), the frames comprising a succession of bursts (B1, . . . , Bn) modulated with at least two different modulation schemes (M1, M2, M3) having different modulation efficiencies, each modulation scheme (M1, M2, M3) having a corresponding average transmitted power. The method according to the invention comprises the steps of: mapping information to be transmitted to modulation symbols using one of the modulation schemes (M1, M2, M3); filtering the modulation symbols using a digital transmission filter with a set of coefficients, the set being chosen from at least two sets of coefficients depending on the modulation scheme (M1, M2, M3) used at the mapping step, the product of the average transmitted power and the gain of the digital transmission filter being smaller than a predefined value for all modulation schemes (M1, M2, M3).

Abstract: 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.

Abstract: The invention relates notably to a method for transmitting frames on a radio communication channel (RCC), the frames comprising a succession of bursts (B1, . . . , Bn) modulated with at least two different modulation schemes (M1, M2, M3) having different modulation efficiencies, each modulation scheme (M1, M2, M3) having a corresponding average transmitted power.

Abstract: A method and apparatus for coherent demodulation for phase shift keyed signals including:a phase estimation stage based on a sequence of reference symbols transmitted at the start of each block of data anda second order phase-locked loop stage.

Abstract: A method of detecting a disturbing signal for demodulating digital data, wherein, on the modulated signal transposed into baseband, the disturbing signal is detected by periodically inserting known signals by means of a fixed guard time delay ((R+I)T.sub.s) applied to the received signal prior to demodulation, and wherein said method includes: a step of estimating the square of the modulus of the cross-correlation of the received referenced signal and of the expected signal at a determined instant when the reference signal is assumed to be present; a step of estimating the square of the correlation of the received signal at the same instant, of multiplying by a coefficient which represents the square of the threshold for the estimated correlation coefficient, and of multiplying by the number of reference symbols used in a reference burst; and a step of comparing with each other the two quantities obtained simultaneously during the preceding two steps.