Abstract:
The decoding of an UWB-IR signal modulated through a transmitted reference (TR) modulation scheme, comprises subtracting from the UWB-IR modulated signal, a version of said UWB-IR modulated signal delayed with a delay corresponding to the delay used in the TR modulation scheme, and decoding the resulting signal by using a non-coherent detection. Further for providing a more energy efficient way of transmitting information, a method of coding information to be conveyed by an UWB-IR signal, comprises sending within each Pulse Repetition Period (PRP) a reference pulse followed by a pulse train including at least two mutually delayed information pulses. A non-coherent detection may also be used for decoding a signal modulated through a TR-BPPM modulation scheme.
Abstract:
Die vorliegende Erfindung betrifft ein optoelektronisches Bauelement zur Umwandlung elektromagnetischer Strahlung in einen intensitätsabhängigen Photostrom bestehend aus einem, insbesondere in CMOS-Technologie, ausgebildeten Substrat (1) mit einer integrierten Halbleiterstruktur (ASIC) und einer in Lichteinfallsrichtung vorgeordneten optisch aktiven Dünnschichtstruktur, bestehend aus einer Schicht (9) aus einem transparenten leitfähigen Material und mindestens einer Schicht (6, 7, 8) aus Halbleitermaterial, welche auf einer isolierenden Schicht (4) angeordnet sind, innerhalb der sich Verbindungsmittel (2, 3, 5) zur Kontaktierung der optisch aktiven Dünnschichtstruktur mit der auf dem Substrat angeordneten integrierten Halbleiterstruktur befinden. Zur Lösung der Aufgabe, ein optoelektronisches Bauelement der genannten Art dahingehend weiter zu entwickeln, dass die elektrische Verbindung zwischen der Schicht (9) aus transparentem leitfähigen Material und einem elektrischen Potentialanschluss (15) fertigungstechnisch auf einfache Weise hergestellt werden kann, ist vorgesehen, dass die Schicht aus transparentem leitfähigen Material durch eine zusätzlich auf dem Substrat ausgebildete leitfähige Struktur (10, 11, 12, 13) mit dem außerhalb der Bildelementeanordnung angeordneten Potentialanschluss (15) verbindbar ist.
Abstract:
Method for transmitting information in a multi-band OFDM system, comprising delivering according to a given communication standard an initial data stream (IDS) , splitting (11) said initial data stream into a chosen number of elementary data streams and simultaneously transmitting (12) said elementary data streams according to said communication standard on said communication medium (MD) within different respective sub-bands (SBi) . These sub-bands all blong to the same band group. Proposal based on the MBOA standard.
Abstract:
The method comprises a main interference reduction mode (MIRM) for reducing interferences generated by a wide band device towards a narrow band device. Said method is performed within said wide band device and detecting (40) an emission from and/or a reception performed by said narrow baand device, determining (41) from said detection step a group of at least one sub-carrier having frequencies interfering with the narrow band device determining (42) the bits which correspond to the information carried by said interfering sub-carriers of said group and processing (43) said determined bits such that they are mapped into a reference symbol having an amplitude equal or close to zero.
Abstract:
This is a method for controlling the decoding of a LDPC encoded codeword composed of several digital data, said LDPC code being represented by a bipartite graph between check nodes (CN 1 ) and variable nodes (VN i ). Said method compri ses updating messages exchanged iteratively between variable nodes (VN1) and check nodes (CN 1 ). Said method comprises, at each iteration, calculating for each variable node a first sum ( Λ n ) of all the incident messages ( λ i ) received by said variable node and the corresponding digital data ( λ ch ) and calculating a second sum (VNR new ) of all the absolute values of the first sums ( Λ n ), and stopping the decoding process if the second sum (VNR new ) is unchanged or decreases within two successive iterations and if a predetermined threshold condition is satisfied.
Abstract translation:这是一种用于控制由几个数字数据组成的LDPC编码码字的解码的方法,所述LDPC码由校验节点(CN1> 1)和可变节点(VN)之间的二分图表示, I SUB>)。 所述方法包括更新在可变节点(VN1)和校验节点(CN <1)之间迭代地交换的消息。 所述方法包括:在每次迭代时,为每个可变节点计算由所述可变节点接收的所有事件消息(?> i i i> the the the the the the the the the the the the the the) 相对应的数字数据(ΔTA),并且计算第一和(%)的所有绝对值的第二和(VNR)新的&lt; / SUB&gt; 并且如果在两个连续的迭代中第二个和(VNR新的)不变或减小,并且如果满足预定的阈值条件,则停止解码过程。
Abstract:
Method of decoding LDPC codes such as IRA codes used in the DVB-S2 standard, the code graph comprising first variable nodes (systematic), second variable nodes (parity) having a degree two, and check nodes connected to second variable nodes by a zigzag connectivity, the method comprising a) grouping the check nodes into at least one group, the check nodes of each group being connected by variable nodes called internal variable nodes, b) performing for each group (GR j ) the following sub-steps b1) and b2): b1) jointly updating (71) all the check nodes of said group by using an algorithm of the Maximum-A-Posteriori (MAP) type on a two-state trellis, b2) updating (72, 73) all the first variable nodes and all the second variable nodes (PN i-1,i ; PN i,i+1 ) connected to said group except said at least one internal second variable node, c) iteratively repeating step b). When using a plurality of groups, a corresponding plurality of trellis windows are LogMAP decoded without training period since connecting parity nodes are updated according to the sum-product algorithm.
Abstract:
Ce procédé de démodulation souple de données modulées suivant une modulation d'amplitude en quadrature s'applique dans un système de communication mettant en œuvre une technique d'accès multiple à répartition par codes ou CDMA et un multiplexage par division de fréquences orthogonales ou OFDM, utilisant des codes d'étalement non binaires. Il comporte des étapes (340) consistant à déterminer une expression simplifiée particulière du logarithme du rapport de vraisemblance.
Abstract:
The method comprises an interference deduction mode (ADIRM) for reducing interferences between a wide band device and a narrow band device; said method is performed within said wide band device and includes the steps of detecting (130) an emssion from and/or a reception performed by said narrow band device, determining (131) from said detection step a group of at least one sub-carrier having frequencies interfering with the narrow band devices, frequencies shifting (132) at least a part of frequncy band of said wide band device including said group of at least one interfering sub-carriers with a chosen frequency shift such that at least a part of frequency band of said narrow band device is excluded from said frequency band of said wide band device.
Abstract:
There is disclosed a multi-carrier transceiver system for use in echo-cancellation. The transceiver system is arranged to generate from input data (1) a multi-carrier transmit signal (u) comprising a plurality of multi-carrier data blocks. The transceiver system also has a multi-carrier signal receiver responsive to an input multi-carrier receive signal (Yi) received from a remote signal transmitter. An echo canceller (2000) is arranged to generate from a pair of multi-carrier data blocks (u) a set of frequency-domain echo parameters (W) for use in generating an echo signal, (Y), to generate the echo signal using the frequency-domain echo parameters (W), and to input the echo signal (Y) to the multi-carrier signal receiver for use in generating an echo-cancelled receive signal (Ei) from the input receive signal (Yi) and the echo signal (Y).