Commissariat a L'energie Atomique

Other

Stmicroelectronics S.a.

Sébastien Leveque

Norbert Daniele

Didier Lattard

Bernard Piaget

Dominique Noguet

Jean-René Lequepeys

Laurent Ouvry

Didier Varreau

Luc Garcia

Marc Joisson

Disclosed is a data transmission process using repetitive sets of spreading sequences, and corresponding transmitted and receiver. According to the invention, spectrum spreading is done on symbol packets using set of pseudo-random sequences used repetitively. This thus reduces interference between symbols. The present invention is applicable to digital communications by spectrum spreading.

Data transmission using repeated sets of spreading sequences

A receiver for transmission and parallel interference has multiple access interference suppression stages having K channels, each comprising a correlation device corresponding to a particular pseudorandom sequence and interference generation and suppression device. Each stage delivers to the following stage signals at least partly freed from multiple access interferences. A decision stage receives the signals from the channels of the preceding suppression stage. Each decision stage has a correlation device corresponding to one of the pseudorandom sequences and decision device to deliver data. Devices for producing synchronization signals can control the interference suppression and the decision device. The devices producing the synchronization signals have components placed in the channels of the final stage. Further, the synchronization signals produced by these devices control the decision device of the channels of the final stage and the interference estimation device of the at least one interference suppression stages following appropriate time shifts.

CDMA receiver with parallel interference suppression and optimized synchronization

This invention relates to parallel architecture digital filter and signal receiver with spectrum spreading using such a filter, the filter may have p shift registers (R, R) with means for calculating a weighted sum of stored samples in the registers, p weighted sums (S, S) may be obtained and recombined with number p being, for example, equal to 2.

Parallel architecture digital filter and spread spectrum signal receiver using such a filter

A receiver of a frequency-modulated signal representing a digital signal includes a down conversion unit or frequency translation unit to lower the frequency of the frequency-modulated signal and a digital demodulator to regenerate the digital signal from the lowered-frequency signal. The receiver furthermore includes a counter circuit to determine the number of periods of a reference signal from the frequency translation unit during a period of the lowered-frequency signal. The digital demodulator includes a computer unit to compute the period of the lowered-frequency signal from the number of periods of the reference signal.

Receiver of frequency-modulated signals with digital demodulator

A data transmission process using repetitive sets of spreading sequences, and corresponding transmitter and receiver. Spectrum spreading is performed on symbol packets using sets of pseudo-random sequences used repetitively, thus reducing interference between symbols.

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La Cote Saint André, France

Sébastien Leveque