Abstract:
A full-duplex relay and method of a telecommunication system having several sources, at least the relay and a recipient. The relay includes: a decoder estimating a message for each source, from successive received blocks transmitted during a current interval by a source, a decision module deciding which source messages were decoded without error from the estimated messages, a network encoder encoding a selection of the messages decoded without error and a transmitter transmitting a signal representative of the network encoded messages to the destination and a control signal indicating the selected messages. The decision module selects messages decoded without error at the input of the network encoder by only considering a return path from the destination indicating correct or incorrect decoding of messages. After each reception of a block, the decision module prevents the emission by the transmitter for a time period necessary to receive and decode the return path.
Abstract:
A method and relay for relaying messages. The relay includes tests reliability relating solely to messages estimated with error and taken in their form prior to error detection in order to be able to separate messages that are reliable and messages that are not reliable. The relay also includes a shaper unit having a channel interleaver and a modulator taking account only of the messages estimated without error and of those messages estimated with error that are reliable, this shaping being performed in soft form if at least one message estimated with error successfully passes the reliability test.
Abstract:
A method for non-orthogonal transmission of a signal intended for a system with N sources, M relays and a single receiver, in which simultaneous transmission over a single spectral resource by the relays is simultaneous with a transmission over a single spectral resource by the sources. The method includes, for each relay: joint iterative detection/decoding of messages transmitted respectively by the sources during first transmission intervals to obtain decoded messages; detecting errors on the decoded messages; interleaving the detected error-free messages, followed by algebraic network coding including a linear combination, in a finite field of an order higher than two, of the interleaved messages to obtain a coded message, the linear combinations being independent, in pairs, between the relays; and channel coding to generate a signal representative of the network coded message and to transmit this signal during the subsequent transmission intervals simultaneously with a transmission by the sources.
Abstract:
A method for semi-orthogonal transmission of a signal intended for a system with N sources, M relays and a single receiver whereby the simultaneous transmission on a same spectral resource by the relays is successive and not simultaneous to a simultaneous transmission on a same spectral resource by the sources. The includes, by relay: joint iterative detection/decoding of messages transmitted respectively by the sources to obtain decoded messages, detecting errors on the decoded messages, interleaving the detected messages without errors followed by algebraic network coding consisting of a linear combination in a finite group of an order strictly higher than two of the interleaved messages to obtain a coded message, the linear combinations being independent, two by two, between the relays of the system, and formatting including channel coding to generate a signal representative of the network coded message.
Abstract:
A full-duplex relay and method of a telecommunication system having several sources, at least the relay and a recipient. The relay includes: a decoder estimating a message for each source, from successive received blocks transmitted during a current interval by a source, a decision module deciding which source messages were decoded without error from the estimated messages, a network encoder encoding a selection of the messages decoded without error and a transmitter transmitting a signal representative of the network encoded messages to the destination and a control signal indicating the selected messages. The decision module selects messages decoded without error at the input of the network encoder by only considering a return path from the destination indicating correct or incorrect decoding of messages. After each reception of a block, the decision module prevents the emission by the transmitter for a time period necessary to receive and decode the return path.
Abstract:
A relaying method in a telecommunication system having a plurality of sources, a half-duplex relay relay and a recipient. The relay performs a receiving phase of: receiving codewords transmitted by the sources, including estimating for each source a message associated with the codewords transmitted by the source, error detection and decision of error-free decoded messages, which determine the set of sources decoded without error by the relay; a phase of coding and transmitting to the recipient a signal uniquely representative of the selection of messages, such that, after each reception of a block from different sources, the relay receives and decodes a return path from the destination indicating if no or at least one message is decoded without error, these messages determining the set of sources decoded without error. The relay switches from the receiving phase to the coding and transmission phase once a logic rule is valid.
Abstract:
A relaying method performed by a half duplex relay for a telecommunications system. The method includes a reception stage of receiving codewords transmitted by a source, the successive codewords corresponding to B blocks, the first of which can be decoded independently of the other blocks. This stage includes a decoding step of estimating a message from each source based on received codewords, the message being associated with the codewords transmitted by the source. The relay performs an error detection and decision-taking step on messages that are decoded without error. The relay encodes a signal and forwards it to the destination, wherein the signal is representative of only those messages that are decoded without error, such that the relay passes from non-selective reception to selective reception after receiving B1 blocks and switches from the reception stage to the encoding and forwarding stage under control of the error detection and decision stage.
Abstract:
A method for relaying messages via a half-duplex relay for a telecommunications system with M sources, L relays and a destination, where M>1, L≥1, according to an orthogonal multiple access scheme of the transmission channel between the L relays and the destination. The method includes: decoding, via a relay, M messages each being associated with a frame and coming from a source among the M sources with detection of errors on the messages; transmitting from the relay to the destination a signal representative of a least one portion of a set of the messages for which no errors have been detected by the relay conditional on authorization from the destination, transmitting from the relay to the destination of a monitoring signal indicating a set of messages for which no errors have been detected by this relay, this transmission of the monitoring signal occurring before the transmission of the representative signal.
Abstract:
A method for relaying messages via a half-duplex relay for a telecommunications system with M sources, L relays and a destination, where M>1, L≥1, according to an orthogonal multiple access scheme of the transmission channel between the L relays and the destination. The method includes: decoding, via a relay, M messages each being associated with a frame and coming from a source among the M sources with detection of errors on the messages; transmitting from the relay to the destination a signal representative of a least one portion of a set of the messages for which no errors have been detected by the relay conditional on authorization from the destination, transmitting from the relay to the destination of a monitoring signal indicating a set of messages for which no errors have been detected by this relay, this transmission of the monitoring signal occurring before the transmission of the representative signal.
Abstract:
A method for transmitting successive messages forming a frame, implemented by a telecommunications system with M sources (S1, . . . , SM), possibly L relays (R1, . . . , RL) and a destination, M≥2, L≥0. The method implements a HARQ mechanism and includes: transmitting, from the destination to the nodes (R1, R2, . . . , RL+M), a control message indicating its set (SD,t−1) of correctly decoded source messages; determining, by each node (R1, R2, . . . , RL+M), whether at least one message from its set of correctly decoded source messages does not belong to the set of source messages correctly decoded by the destination; and transmitting a binary indicator by a node (R1, R2, . . . , RL+M) to the destination indicating the result of the determination.