Abstract: 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.

Abstract: Embodiments for non-coherent phase differential and multiple orthogonal signal modulation/demodulation are disclosed. One illustrative embodiment may include: a method for non-coherent reception of a signal with spectrum spreading, comprising performing a multiple orthogonal signal demodulation operation on the signal; performing a phase differential demodulation operation on the signal; and combining the results of the multiple orthogonal signal demodulation operation on the signal and the phase differential demodulation operation on the signal.

Abstract: A receiver is configured to receive signals corresponding to spread spectrum information symbol streams. The receiver includes a plurality of channel circuits for receiving signals. Each channel circuit is responsive to a received signal for recovering an associated information signal therefrom. The associated information signal is spread by a sequence associated with the respective channel circuit. Each channel circuit is controlled by a clock signal derived by at least a first channel circuit of the plurality of channel circuits. The at least first channel circuit is responsive to the received signal for generating the clock signal by digitally filtering the received signal using digital filter coefficients adapted to the sequence associated with the at least first channel circuit.

Abstract: A generator of repetitive sets of spreading sequences includes an element for counting and for forming an address and a table containing L sets of S sequences. The address contains q+log2S bits. The q bits are used for selecting one set among L (L=2q) sets. The log2S bits are used for selecting one sequence among the S sequences in the set.

Abstract: At transmission, the data to be transmitted is divided into N data blocks, these N blocks are processed in parallel in N M-ary orthogonal keying (MOK) modulation channels, each modulation using a group of spread codes, each channel emitting a signal. All of these signals are transmitted in series. At reception, the signal received is processed in N M-ary orthogonal keying (MOK) demodulation channels, and the blocks obtained are grouped together in series.

Abstract: The present invention relates to a digital transmitting/receiving circuit (1) intended to be mounted on at least one source and on at least one concentrator exchanging binary symbols with the said sources, the said circuit (1) comprising a transmitter (2) capable of transmitting the said binary symbols and a receiver (4) capable of receiving symbols transmitted by a source, the circuit (1) being characterized in that the transmitter (2) comprises a first module (20) intended to generate at least one binary code for effecting the spectral spreading of symbols to be transmitted and a second module (22) intended to generate at least one internal clock signal for synchronizing the reception of symbols transmitted by a source, and in that the said receiver comprises means (46, 48) for detecting new sources of transmission and means (49) for generating synchronization signals and power control signals corresponding to each new source detected.

Abstract: A method and an apparatus for transmitting data using multi-MOK modulation/demodulation transmission process corresponding to transmitter and receiver are disclosed. At transmission, the data to be transmitted is divided into N data blocks. The N blocks are processed in parallel in N M-ary orthogonal keying (MOK) modulation channels, each modulation using a group of spread codes, each channel emitting a signal, all these signals (S) are transmitted in series. At reception, the signal received (R) is processed in N MOK demodulation channels and the blocks obtained are grouped together in series.

Abstract: At transmission, the data to be transmitted is divided into N data blocks, these N blocks are processed in parallel in N M-ary orthogonal keying (MOK) modulation channels, each modulation using a group of spread codes, each channel emitting a signal, all these signals (S) are transmitted in series. At reception, the signal received (R) is processed in N M-ary orthogonal keying (MOK) demodulation channels and the blocks obtained are grouped together in series.

Abstract: A generator of repetitive sets of spreading sequences comprising means (20) for counting and for forming an address and a table (30) containing L sets of S sequences, wherein the address contains q+log2S bits, wherein the q bits are used for selecting one set among L (L=2q) sets and wherein the log2S bits are used for selecting one sequence among the S sequences in the set.

Abstract: Data transmission process using repetitive sets of spreading sequences, and corresponding transmitter and receiver. According to the invention, spectrum spreading is done on symbol packets using sets of pseudo-random sequences used repetitively. This thus reduces interference between symbols. Application to digital communications by spectrum spreading.

Abstract: A generator of repetitive sets of spreading sequences comprising element (20), for counting and for forming an address and a table (30) containing L sets of S sequences, wherein the address contains q=1+log2S bits, in which one set among L (L=2q) sets is selected and wherein the log2S bits select one sequence among the S sequences in the set.

Abstract: 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.

Abstract: Process for non coherent DP-MOK reception with combination of multiple paths and corresponding receiver. According to the invention, demodulation of orthogonal signals (MOK) is combined with a differential phase demodulation (DP) and diversity processing related to multiple paths in the radiofrequency channel. Diversity processing is achieved making use of differential demodulation by calculating a weighting factor, this factor then being used in the MOK part (before selecting and switching) and in the DP part to correct the calculated energy. Applications for digital transmissions.

Abstract: The receiver includes at least one channel (V1) with an adapted filter (20) and with a symbol clock signal (Hs) recovery circuit (12) and other channels (V2, . . . , Vk) with a sliding correlator (302, . . . , 30k) using the symbol clock signal (Hs) produced by the channel (V1) with adapted filter. Application for radiocommunications with mobiles.

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 receiver configured to receive signals corresponding to spread spectrum information symbol streams by pseudorandom binary sequences includes at least one channel (V1) with an adapted filter (20) and with a symbol clock signal (Hs) recovery circuit (12) and other channels (V2, . . . , Vk) with a sliding correlator (302, . . . , 30k) using the symbol clock signal (Hs) produced by the channel (V1) with adapted filter.

Abstract: A process for non coherent DP-MOK reception with combination of multiple paths and corresponding receiver. The process includes demodulation of orthogonal signals (MOK) which is combined with differential phase demodulation (DP) and diversity processing related to multiple paths in the radiofrequency channel. Diversity processing is achieved making use of differential demodulation by calculating a weighting factor, this factor then being used in the MOK part (before selecting and switching) and in the DP part to correct the calculated energy.

Abstract: A method of processing a pulse response with an adaptive threshold and corresponding receiver. According to the method, an adaptive threshold is calculated that is a function of a maximum reached by the pulse response, noise, and a coefficient adjustable between 0 and 1. The processing only comes into operation for signals that exceed this threshold. Such a method may find application notably to digital radio-communications with spread spectrum.

Abstract: The present invention relates to a digital transmitting/receiving circuit (1) intended to be mounted on at least one source and on at least one concentrator exchanging binary symbols with the said sources, the said circuit (1) comprising a transmitter (2) capable of transmitting the said binary symbols and a receiver (4) capable of receiving symbols transmitted by a source, the circuit (1) being characterized in that the transmitter (2) comprises a first module (20) intended to generate at least one binary code for effecting the spectral spreading of symbols to be transmitted and a second module (22) intended to generate at least one internal clock signal for synchronizing the reception of symbols transmitted by a source, and in that the said receiver comprises means (46, 48) for detecting new sources of transmission and means (49) for generating synchronization signals and power control signals corresponding to each new source detected.

Abstract: Receiver module and receiver formed from several cascaded module. The module comprises inputs (E1, E2, E3, E4) and outputs (S1, S2, S3, S4) connected to a selection means (44) circuit, to a switching means (45) circuit, and to a decoding means (46, 58, 60) circuit. Such modules can be cascaded by simply connecting the corresponding inputs and outputs. The final module delivers the transmitted information. Application to differential phase modulation and orthogonal modulation spread spectrum digital transmission.