Canon Kabushiki Kaisha

Canon Research Centre France

François Thoumy

Patrice Nezou

Stéphane Baron

Philippe Le Bars

Samuel Rousselin

Lionel Le Scolan

Frédérique Ehrmann

Mickaël Lorgeoux

Mounir Achir

Brice Le Houerou

Isabelle Amonou

Alain Caillerie

Pascal Rousseau

Eric Majani

Mohamed Braneci

Frédérique Ehrmann-Patin

A communication device in a communication network according to the invention comprises: a signal processing unit configured to demodulate symbols of a received digital signal into payload data to be provided to a data processing unit through an interfacing link, e.g. a MAC/PHY interface, the received digital signal being made of raw data; a bandwidth determining module configured to determine available bandwidth in a transmission slot allocated to one symbol of the received digital signal for transmitting corresponding payload data through the interfacing link; a sampler configured to select raw data from the received digital signal that correspond to the determined available bandwidth; and a multiplexer configured to combine the selected raw data with the payload data corresponding to the one symbol into the same transmission packet to be provided to the data processing unit through the interfacing link.

Communication devices in a communication network and methods for processing data in such devices

A method of encoding a bitstream includes obtaining at least one current input word of the bitstream to encode, determining at least one nominal codeword associated with the at least one input word according to an error-control code, selecting one of the at least one nominal codeword or a substitute codeword in order to keep a current running digital sum and/or a running alternate sum bounded, and outputting an encoded word comprising the selected codeword. Embodiments make it possible to generate an encoded bitstream which is 'DC free' and 'Nyquist free' while providing error correction with a fixed coding rate.

DC-free nyquist-free error correcting line coding

A method of controlling data transmission from a transmitting unit to a receiving unit through an asynchronous serial link is provided. The method is performed by a controlling unit and includes the steps of sequentially receiving data and synchronization messages are sequentially received from the transmitting unit; sequentially parsing the messages received; and when a message parsed is a synchronization message, blocking relaying to the receiving unit, of the data messages following said synchronization message, until an event associated with the synchronization message occurs.

Time sensitive transaction over an asynchronous serial link

A method is proposed for determining an erasures vector associated with a data block to be decoded built out of received copies, and using levels of reliability of transmission associated with symbols contained in different copies of a same block of received pieces of data. Such a method advantageously makes reduces the error rate at output of a decoder by minimizing the operations to be performed to determine the erasures vector, marking the erasures and preventing the generation of an excessively large number of erasures (even when the transmission of certain received copies is unreliable) to have a number of erasures that does not exceed the correction capacity of the decoder.

Method for determining a copy to be decoded and an associated erasures vector, corresponding storage means and receiver device

Methods for configuring antennas of first and second nodes of a wireless communications network clocked by transmission cycles, each cycle being divided into time slots, the first node and second nodes having first and second time slots for transmitting data in the first mode, the first node having a third time slot for transmitting data to the second node in a second mode, are proposed. The configuring method, on the second node side, comprises steps of determining a receiving configuration of the antenna of the second node, verifying that the determined receiving configuration is invariant, relative to a receiving configuration previously used for receiving data transmitted from the first node to the second node in the second mode; in the event of negative verification: sending a predetermined signal in the second mode, by using a sending configuration that is determined based on the determined receiving configuration; configuring, during the third time slot, the antenna of the second node by using this determined receiving configuration.

Methods for configuring sender and receiver antennas, corresponding storage means and nodes

A method for assigning audio channels of audio data content to speakers, each of which is associated with a different one of N speaker nodes of a wireless network. The method is performed by a manager node of the wireless network. The method includes, for each of the N speaker nodes, obtaining a piece of orientation information for each of N&#x2212;1 other speaker nodes different from the given speaker node, regarding an orientation of a reception antenna of the given speaker node when receiving data sent by each of the N&#x2212;1 other speaker nodes through the wireless network. The method also includes assigning a different one of the audio channels to a different one of the speaker nodes, as a function of N&#x2212;1 pieces of orientation information obtained for each of the N speaker nodes.

Method for assigning a plurality of audio channels to a plurality of speakers, corresponding computer program product, storage means and manager node

In a mesh network using a TDMA protocol: determination is made of a first set of antenna angles to be used by a receiving antenna of a recipient node to capture data respectively sent by a plurality of sending nodes; reception is made of data sent by the sending nodes using the respective antenna angle of the first set; at least one correlation operation is made between the various redundant copies of the same item of data, received by the recipient node; at least one copy not necessary for the decoding of the received data is deduced determination is made of at least one time slot during which the copy not necessary for the decoding is received; and during that time slot, the antenna angle used by the receiving antenna to receive data sent by the sending node allocated to that time slot is updated.

Method and device for antenna tracking

Antenna beam angles of one or more directional antennas of a wireless device are updated to communicate with a plurality of other wireless devices. Each one of the antenna beam angles is associated with one of the plurality of other wireless devices. At least one angle correction is determined to update the antenna beam angle associated with at least one first wireless device among the plurality of other wireless devices. The antenna beam angle associated with at least one second wireless device is first updated using the determined at least one angle correction of the antenna beam angle associated with the first wireless device.

Method, apparatus and computer program for updating antenna beam angles of a directional antenna of wireless device

In a wireless communication network comprising at least one mobile terminal and an access point, the access point detects a beacon signal transmitted by a mobile terminal, and transmits a beacon signal in place of a given mobile terminal if it detects that the given mobile terminal transmits a beacon signal. The mobile terminal, on the other hand, stops transmitting the beacon signal and receives the beacon signal transmitted by the access point.

Method of communication in a network

In order to evaluate the noise related to data issuing from a turbo-encoder, estimates of the noise related to its systematic output, to the data issuing from its first elementary encoder, and to the data issuing from its second elementary encoder are determined. At least two of the estimates of the noise related to the systematic output, to the data issuing from the first encoder, and to the data issuing from the second encoder, are added. The results of these additions are divided by the number of augends added, and then inverted, so as to obtain a noise factor, and the noise factor is multiplied with the data issuing from at least one of the first encoder, second encoder, and systematic output.

Method and device for evaluating the noise associated with turbocodes, and systems using them

In a data transmission method, said data are organized in blocks of K frames, each of said frames being composed of N binary words, each of these binary words being associated with an 'elementary symbol'. Each of the M=K&#xb7;N elementary symbols per block modulates a different sub-carrier amongst a series of sub-carriers forming an OFDM modulation, the allocation of each elementary symbol to a given sub-carrier being effected so that, when the OFDM signal is demodulated after it is received, a chosen subset is extracted from amongst said K frames. Application to the transmission of data representing compressed images in accordance with the JPEG2000 standard.

Method and device for transmitting hierarchical data

The method of transmitting data in the form of symbols sent over an electromagnetic channel is characterized in that a measurement of significance is attributed to each group of data to be transmitted, in that the transmission reliability of the carriers is estimated dynamically, and in that the most significant data are sent over the most reliable carriers at each instant, the other data being sent over the carriers of decreasing reliability, in decreasing order of significance of the data.

Device and method for the dynamic allocation of frequencies for multicarrier modulation systems

A method of transmitting blocks of data, in which, for at least one of the blocks of data, at least one parameter associated with this block of data is transmitted, the parameter representing the relative importance of the block of data associated with this parameter within the message transmitted by all the blocks of data. The data is coded by a channel coding method which does not take into account the parameter. Correlatively, the invention also concerns a decoding method associated with this transmission method. This way, data judged to be more important than other data may benefit from a channel decoding of higher quality. The methods described herein have application to devices and appliances implementing these methods.

Adaptive optimization methods, devices and appliances for the transmission of coded signals

The present invention concerns a method and an apparatus of generating a reference event in a receiving node receiving frames of information, when a frame of information is received, the method and the apparatus sample the frame of information in order to form sampled data, process sampled data in order to detect among said sampled data a specific data, monitor the number of processed sampled data until the detection of a specific data and generate a reference event according to the result of processing and monitoring.

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Vignoc, France

François Thoumy