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    • 3. 发明申请
    • MULTI-ACCESS TELECOMMUNICATIONS SYSTEM WITH ADAPTED STRATEGY FOR PACKET RETRANSMISSION
    • 具有适用于分组重传的策略的多通道电信系统
    • US20110044314A1
    • 2011-02-24
    • US12990444
    • 2009-04-30
    • Emilio Calvanese StrinatiDimitri Ktenas
    • Emilio Calvanese StrinatiDimitri Ktenas
    • H04B7/208H04L1/18G06F11/14
    • H04L1/1867H04L1/0026H04L5/0007H04L5/006
    • A wireless OFDMA telecommunications system comprising a transmitter adapted to transmit, by means of an OFDM modulator, a plurality of data packets destined for receivers of a plurality of users, via the same plurality of transmission channels, the transmission channel of a user being associated with a group of sub-carriers of the OFDM multiplex and a set of OFDM symbol times of a transmission interval, each receiver being adapted to signal to the transmitter the loss of a packet transmitted over the transmission channel of the corresponding user, said transmitter further comprising a packet scheduler adapted to control retransmission of each packet lost by means of said modulator. Each receiver comprises detection means of an outage situation of the transmission channel of the corresponding user and signals this to said transmitter by means of an outage information (OUTAGE/NOUTAGE). In the event of outage, said scheduler prohibits any retransmission of a packet lost over said channel during a predetermined time (Tout) greater than or equal to the coherence time of said channel.
    • 一种无线OFDMA电信系统,包括适于通过OFDM调制器经由相同的多个传输信道发送去往多个用户的接收机的多个数据分组的发射机,所述发射机与用户的传输信道相关联 OFDM多路复用的一组子载波和传输间隔的一组OFDM符号时间,每个接收机适于向发射机发信号通过对应用户的传输信道发送的分组的丢失,所述发射机还包括 分组调度器,其适于控制通过所述调制器丢失的每个分组的重传。 每个接收机包括相应用户的传输信道的中断情况的检测装置,并借助于中断信息(OUTAGE / NOUTAGE)将其发送给所述发射机。 在中断的情况下,所述调度器在大于或等于所述信道的相干时间的预定时间(Tout)期间禁止对所述信道丢失的分组的任何重传。
    • 5. 发明授权
    • Multi-access telecommunications system with adapted strategy for packet retransmission
    • 多重接入电信系统,适用于分组重传策略
    • US08537801B2
    • 2013-09-17
    • US12990444
    • 2009-04-30
    • Emilio Calvanese StrinatiDimitri Ktenas
    • Emilio Calvanese StrinatiDimitri Ktenas
    • H04B7/208
    • H04L1/1867H04L1/0026H04L5/0007H04L5/006
    • A wireless OFDMA telecommunications system comprising a transmitter adapted to transmit, by means of an OFDM modulator, a plurality of data packets destined for receivers of a plurality of users, via the same plurality of transmission channels, the transmission channel of a user being associated with a group of sub-carriers of the OFDM multiplex and a set of OFDM symbol times of a transmission interval, each receiver being adapted to signal to the transmitter the loss of a packet transmitted over the transmission channel of the corresponding user, said transmitter further comprising a packet scheduler adapted to control retransmission of each packet lost by means of said modulator. Each receiver comprises detection means of an outage situation of the transmission channel of the corresponding user and signals this to said transmitter by means of an outage information (OUTAGE/NOUTAGE). In the event of outage, said scheduler prohibits any retransmission of a packet lost over said channel during a predetermined time (Tout) greater than or equal to the coherence time of said channel.
    • 一种无线OFDMA电信系统,包括适于通过OFDM调制器经由相同的多个传输信道发送去往多个用户的接收机的多个数据分组的发射机,所述发射机与用户的传输信道相关联 OFDM多路复用的一组子载波和传输间隔的一组OFDM符号时间,每个接收机适于向发射机发信号通过对应用户的传输信道发送的分组的丢失,所述发射机还包括 分组调度器,其适于控制通过所述调制器丢失的每个分组的重传。 每个接收机包括相应用户的传输信道的中断情况的检测装置,并借助于中断信息(OUTAGE / NOUTAGE)将其发送给所述发射机。 在中断的情况下,所述调度器在大于或等于所述信道的相干时间的预定时间(Tout)期间禁止对所述信道丢失的分组的任何重传。
    • 9. 发明授权
    • Method for the flexible demodulation of estimated complex symbols
    • 估计复合符号灵活解调的方法
    • US08155230B2
    • 2012-04-10
    • US11817267
    • 2005-03-08
    • Dimitri KtenasMathieu Bouvier Des NoesJulien BarlettaClaire Guyon
    • Dimitri KtenasMathieu Bouvier Des NoesJulien BarlettaClaire Guyon
    • H04B7/02
    • H04L25/067H04L5/026
    • A method for soft demapping of complex-valued symbols y(k) (k=1, 2, . . . , K) by calculation of a Logarithm of Likelihood Ratio (LogLR) such that: Log ⁢ ⁢ LR ⁡ ( b I , q ) = ln ⁢ ∑ λ ⁢ ∈ S l , q ( 1 ) ⁢ exp ( - 1 2 ⁢ β ⁢  y ~ ⁡ ( k ) - λ  2 ) ∑ λ ⁢ ∈ S q , l ( 0 ) ⁢ exp ( - 1 2 ⁢ β ⁢  y ~ ⁡ ( k ) - λ  2 ) wherein bI,q is the qth coded bit of an in-phase part of a transmitted signal, β is an asymptotic Signal-to-Interference-plus-Noise Ratio, {tilde over (y)}(k) is a standardized symbol associated with y(k), λ is a reference symbol of QAM constellation associated with a M-QAM modulation, S(1)I,q and S(0)I,q are complex plane partitions that bring together, respectively, all reference symbols λ having a “1” at the position (I, q) and all reference symbols λ having a “0” at the position (I, q), a formula similar to LogLR being given for the bit bQ,p, pth coded bit of a quadrature part of the transmitted signal. The method applies to code division multiple access transmission systems.
    • 一种通过计算似然比对数(LogLR)对复值符号y(k)(k = 1,2,...,K)进行软解映射的方法,使得:Log≠LR⁡(b I, (1)exp( - 1 2&bgr;y⁡(k) - λ2)Σλ∈S q,l(0) exp( - 1 2&bgr;y⁡(k) - λ2)其中bI,q是发送信号的同相部分的第q个编码比特,&bgr; 是渐近的信号与干扰加噪声比,(y)}(k)是与y(k)相关联的标准符号,λ是与M-QAM调制相关联的QAM星座的参考符号 ,S(1)I,q和S(0)I,q分别是在位置(I,q)处分别具有“1”的所有参考符号λ并且所有参考符号λ具有 在位置(I,q)处为“0”,对于发送信号的正交部分的位bQ,p,pth编码比特,给出了类似于LogLR的公式。 该方法适用于码分多址传输系统。
    • 10. 发明申请
    • METHOD OF DECODING BY MESSAGE PASSING WITH SCHEDULING DEPENDING ON NEIGHBOURHOOD RELIABILITY
    • 消息传递方式依赖邻里可靠性排序
    • US20090313525A1
    • 2009-12-17
    • US12374531
    • 2007-07-25
    • Valentin SavinDimitri Ktenas
    • Valentin SavinDimitri Ktenas
    • H03M13/05G06F11/10
    • H03M13/114H03M13/1131
    • The invention relates to an iterative method by message passing for decoding of an error correction code that can be displayed in a bipartite graph comprising a plurality of variable nodes and a plurality of check nodes. For each iteration in a plurality of decoding iterations of said method: variable nodes or check nodes are classified (720) as a function of the corresponding degrees of reliability of decoding information available in the neighbourhoods (Vn(d),Vm(d)) of these nodes, a node with a high degree of reliability being classified before a node with a low degree of reliability; each node thus classified (725) passes at least one message (αmn,βmn) to an adjacent node, in the order defined by said classification. The invention also relates to a computer program designed to implement said decoding method.
    • 本发明涉及一种通过消息传递的迭代方法,用于解码可以在包括多个可变节点和多个校验节点的二分图中显示的纠错码。 对于所述方法的多个解码迭代中的每个迭代,可变节点或校验节点被分类为(720),作为邻域中可用的解码信息的相应可靠度(Vn(d),Vm(d))的函数) 的这些节点,具有高可靠性的节点在具有低可靠性的节点之前分类; 因此分类的每个节点(725)按照由所述分类定义的顺序将至少一个消息(alphamn,betamn)传递给相邻节点。 本发明还涉及一种设计用于实现所述解码方法的计算机程序。