Abstract: A wireless electronic detonator includes a primary source of energy and at least one functional module. A power switch is disposed between the primary source of energy and the functional module to connect or disconnect the functional module and the primary source of energy. A controller controls the power switch and includes an optical receiver to detect and demodulate a light signal emitted by a control console, The controller generates a control signal according to the demodulated light signal to at least control the power switch. A wireless detonation system includes the wireless electronic detonator and the control console configured to emit a light signal, and method for activating the wireless electronic detonator.

Abstract: The invention relates to a device for exchanging digital data between several sources and at least one hub in a CDMA system, characterised in that it comprises a number n of digital transmission/reception circuits (1) installed in parallel, each circuit (1) comprising a transmitter (2i) comprising means of generating an integer number Nc of codes that will be used for spectral spreading of data to be transmitted and a receiver (4i) comprising means (46, 48) of detecting the access of new sources to the CDMA system transmission channel and means (49) of generating synchronisation signals and power control signals corresponding to each detected new source.

Abstract: 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 (Rp, Ri) with means for calculating a weighted sum of stored samples in the registers, p weighted sums (Skp, Ski) may be obtained and recombined with number p being, for example, equal to 2.

Abstract: The invention relates to a device for exchanging digital data between several sources and at least one hub in a CDMA system, characterised in that it comprises a number n of digital transmission/reception circuits (1) installed in parallel, each circuit (1) comprising a transmitter (2i) comprising means of generating an integer number Nc of codes that will be used for spectral spreading of data to be transmitted and a receiver (4i) comprising means (46, 48) of detecting the access of new sources to the CDMA system transmission channel and means (49) of generating synchronisation signals and power control signals corresponding to each detected new source.

Abstract: The invention relates to a device for exchanging digital data between several sources and at least one hub in a CDMA system, characterized in that it comprises a number n of digital transmission/reception circuits (1) installed in parallel, each circuit (1) comprising a transmitter (2i) comprising means of generating an integer number Nc of codes that will be used for spectral spreading of data to be transmitted and a receiver (4i) comprising means (46, 48) of detecting the access of new sources to the CDMA system transmission channel and means (49) of generating synchronization signals and power control signals corresponding to each detected new source.

Abstract: A method for receiving spectrum spreading signals using a Doppler-effect frequency-shift correction generates a corrective signal based on an estimation of a modulation period related to the Doppler effect detected in a preamble portion of a received signal. The corrective signal is used for correcting an information portion of the received signal. Base band digital signals are operated upon by using the DOT and CROSS components.

Abstract: A method for receiving spectrum spreading signals using a Doppler-effect frequency-shift correction generates a corrective signal based on an estimation of a modulation period related to the Doppler effect detected in a preamble portion of a received signal. The corrective signal is used for correcting an information portion of the received signal. Base band digital signals are operated upon by using the DOT and CROSS components.

Abstract: A method for receiving spectrum spreading signals using a Doppler-effect frequency-shift correction generates a corrective signal based on an estimation of a modulation period related to the Doppler effect detected in a preamble portion of a received signal. The corrective signal is used for correcting an information portion of the received signal. Base band digital signals are operated upon by using the DOT and CROSS components.

Abstract: 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 (Rp, Ri) with means for calculating a weighted sum of stored samples in the registers, p weighted sums (Skp, Ski) may be obtained and recombined with number p being, for example, equal to 2.

Abstract: Method for receiving spectrum spreading signals with frequency shift correction. According to the invention, the modulation period related to the Doppler effect is estimated by using a preamble and a correction signal is elaborated, the signal transmitting the information is then corrected by this correction signal. Base band digital signals are operated upon by using the DOT and CROSS components. Application to digital transmissions.

Abstract: 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 (Rp, Ri) with means for calculating a weighted sum of stored samples in the registers, p weighted sums (Skp, Ski) may be obtained and recombined with number p being, for example, equal to 2.

Abstract: The present invention relates to a method for receiving CDMA signals with synchronization being obtained through double delayed multiplication, and an associated receiver. According to the invention, the correlation signal undergoes double delayed multiplication. Synchronization is established on the signal thus generated. Applied to digital communications, in particular with mobile phones.

Abstract: A method for receiving spectrum spreading signals with frequency shift correct in which the modulation period related to the Doppler effect is estimated by using a preamble and a correction signal is elaborated, the signal transmitting the information is then corrected by this correction signal.

Abstract: The invention relates to a device for exchanging digital data between several sources and at least one hub in a CDMA system, characterised in that it comprises a number n of digital transmission/reception circuits (1) installed in parallel, each circuit (1) comprising a transmitter (2i) comprising means of generating an integer number Nc of codes that will be used for spectral spreading of data to be transmitted and a receiver (4i) comprising means (46, 48) of detecting the access of new sources to the CDMA system transmission channel and means (49) of generating synchronisation signals and power control signals corresponding to each detected new source.

Abstract: A method of parallel suppression of interference, and corresponding stage and receiver is disclosed according to the invention, parallel suppression of interference is carried out starting from the signals selected by a maximum likelihood criterion based on the calculation of a metric and the search for the smallest possible metric.

Abstract: A circuit able to operate either as a direct sequence spread spectrum differential signal emitter, or as a generator of interference signals corresponding to multiple access noise. The circuit employs a clock signal formation and data processing module, a differential coding module, a multiplexing module, and a direct sequence spread module when operating as a spread spectrum emitter, and has an additional amplification-inversion module for use when generating an interference signal.

Abstract: A differential receiver which receives a signal corresponding to transmission of a carrier modulated by symbols S.sub.k, where k is an integer designating an order of the symbol, each symbol S.sub.k has a duration Ts and carries information, and the symbols S.sub.k have been multiplied by a psuedorandom sequence. The differential receiver includes a first processing channel configured to receive a first part of the transmitted signal in phase with the carrier to generate samples I.sub.k and delayed samples I.sub.k-1. The receiver further includes a second processing channel configured to receive a second part of the transmitted signal in phase quadrature with the carrier to generate samples Q.sub.k and delayed samples Q.sub.k-1. In addition, the receiver includes a multiplication circuit configured to generate a signal Dot(k) equal to I.sub.k I.sub.k-1 +Q.sub.k Q.sub.k-1 and a signal Cross(k) equal to Q.sub.k I.sub.k-1 -I.sub.k Q.sub.

Abstract: A Differential receiver of direct sequence spread spectrum signals, wherein, the intermediate frequency stage comprises N filtering and amplifying channels in N separate bands. The amplification of a channel is adjusted so that the power levels delivered by the channels correspond to a predetermined power distribution law.

Abstract: The circuit has two parallel channels for the processing of two components in phase (I) and in quadrature (Q). Each channel has filtering means (50(I)) and delay means (60(I)). The circuit also incorporates a multiplication circuit (70), an integration circuit (80) and a programming circuit (90). Several circuits of this type can be connected in cascade.

Abstract: A method of parallel suppression of interference, and corresponding stage and receiver is disclosed according to the invention, parallel suppression of interference is carried out starting from the signals selected by a maximum likelihood criterion based on the calculation of a metric and the search for the smallest possible metric.