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    Method for the broadcasting of digital data, notably for radio broadcasting at high bit rate towards mobile receivers, with time-frequency interlacing and coherent demodulation
    1.
    发明授权
    Method for the broadcasting of digital data, notably for radio broadcasting at high bit rate towards mobile receivers, with time-frequency interlacing and coherent demodulation 失效
    用于广播数字数据的方法，特别是针对移动接收机的高比特率的无线电广播，具有时频隔行扫描和相干解调

    公开(公告)号：US5274629A

    公开(公告)日：1993-12-28

    申请号：US648899

    申请日：1991-01-31

    申请人： Jean-Francois Helard ,  Jean-Michel Lemesle ,  Roselyne Halbert-Lassalle ,  Bernard Le Floch

    发明人： Jean-Francois Helard ,  Jean-Michel Lemesle ,  Roselyne Halbert-Lassalle ,  Bernard Le Floch

    IPC分类号： H04L1/00 ,  H04L25/02 ,  H04L27/26 ,  H04J4/00

    CPC分类号： H04L1/0071 ,  H04L25/0204 ,  H04L25/0214 ,  H04L25/0226 ,  H04L25/0232 ,  H04L27/2647 ,  H04L5/0048

    摘要： A method for the broadcasting of digital data, intended to be received notably by mobile receivers moving about in an urban environment, that is, under conditions of multiple propagation and in the presence of parasites and jamming, enabling a coherent demodulation under such conditions of reception. This method is one for the broadcasting of digital data, notably for radio broadcasting at a high bit rate towards mobile receivers, of the type providing for the distribution of the data in the form of digital elements in the frequency-time space f-t and the transmission of symbols each constituted by a multiplex of N orthogonal carrier frequencies modulated by a set of digital elements and broadcast simultaneously, certain of the digital elements being reference elements with a value and position in the frequency-time space f-t that are known to the receivers.

    摘要翻译： 一种用于广播数字数据的方法，旨在由在城市环境中移动的移动接收机，即在多重传播的条件下以及存在寄生和干扰的情况下被特别接收，使得能够在这种接收状态下进行相干解调 。 该方法是用于广播数字数据的方法，特别是针对移动接收机的高比特率的无线电广播，提供在频率 - 时间空间ft中以数字元素的形式分发数据的类型，并且传输 每个符号由由一组数字元素调制的N个正交载波频率的多路复用构成，并且同时广播，某些数字元素是具有接收机已知的频率 - 时间空间ft中的值和位置的参考元素。

    Device for the transmission of digital data with at least two levels of protection and corresponding reception device
    2.
    发明授权
    Device for the transmission of digital data with at least two levels of protection and corresponding reception device 失效
    用于传输数字数据的设备，具有至少两级保护和对应接收设备

    公开(公告)号：US5197061A

    公开(公告)日：1993-03-23

    申请号：US671483

    申请日：1991-03-19

    申请人： Roselyne Halbert-Lassalle ,  Jean-Francois Helard ,  Bernard Le Floch

    发明人： Roselyne Halbert-Lassalle ,  Jean-Francois Helard ,  Bernard Le Floch

    IPC分类号： H04L1/00 ,  H04L27/26

    CPC分类号： H04L1/0068 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0017 ,  H04L1/0025 ,  H04L1/004 ,  H04L1/007 ,  H04L1/0071 ,  H04L27/2604 ,  H04L2001/0098

    摘要： A device for the transmission of digital data with at least two levels of protection, of the type providing for the distribution of the data to be transmitted in the form of digital elements in the time-frequency space and the transmission of symbols each formed by a multiplex of N orthogonal carriers modulated by a set of the digital elements, and transmitted simultaneously, the device including channel encoding means comprising at least two types of modulation and/or at least two encoding efficiency levels. This enables to optimize the use of the transmission channel by assigning differentiated transmission techniques to portions of data of a same digital train as a function of the different levels of protection sought, against transmission errors.

    摘要翻译： 用于传输具有至少两个级别的保护的数字数据的装置，提供以时间 - 频率空间中的数字元素形式发送的数据的分发，以及由 由一组数字元素调制的N个正交载波的多路复用并且同时发送，所述设备包括信道编码装置，其包括至少两种类型的调制和/或至少两个编码效率水平。 这使得能够通过针对传输错误将差分传输技术分配给与所寻求的不同级别的保护级别相同的数字列的数据的部分来优化传输信道的使用。

    Method for demodulating a signal integrating phase error effect and corresponding receiver
    4.
    发明授权
    Method for demodulating a signal integrating phase error effect and corresponding receiver 失效
    解调信号积分相位误差效应的方法和相应的接收机

    公开(公告)号：US07447288B2

    公开(公告)日：2008-11-04

    申请号：US10477810

    申请日：2002-05-15

    申请人： Stephane Bougeard ,  Jean-Francois Helard ,  Isabelle Siaud

    发明人： Stephane Bougeard ,  Jean-Francois Helard ,  Isabelle Siaud

    IPC分类号： H04L7/00

    CPC分类号： H04L25/06 ,  H04L27/38

    摘要： The invention concerns a method for demodulating a digital signal received via a transmission channel, comprising a step which consists in associating with each value received of said received signal a point of the corresponding modulation constellation, on the basis of the decision boundaries taking into account the potential effect of a phase shift on at least one of said points of the modulation constellation and of the potential effect of an Gaussian additive noise applied on said point, said Gaussian additive noise being represented by a generating surface associated with said point, and said phase shift by a rotation on an angular range based so that said swept surface belongs essentially to the region of decision associated with the corresponding point of the modulation constellation, plotted on the basis of at least one phase and/or amplitude characteristic of said modulation, so as to associate with each of said points of the constellation a portion of a reception space, called corresponding region of decision.

    摘要翻译： 本发明涉及一种用于解调经由传输信道接收的数字信号的方法，该方法包括以下步骤：基于所述决定边界考虑所述接收信号的相应调制星座的点，将与所述接收信号的每个接收到的值相关联 相位偏移对调制星座的所述点中的至少一个以及施加在所述点上的高斯加性噪声的潜在影响的潜在影响，所述高斯加性噪声由与所述点相关联的生成表面表示，并且所述相位 基于角度范围上的旋转，使得所述扫描表面基本上属于基于调制星座的对应点的决定的区域，其基于所述调制的至少一个相位和/或幅度特性来绘制，因此 为了将所述星座的每个所述点与接收空间的一部分相关联，被校准 d对应区域的决定。

    Method of maximum likelihood decoding with sub-sampled decoding trellis, and corresponding decoding device
    5.
    发明授权
    Method of maximum likelihood decoding with sub-sampled decoding trellis, and corresponding decoding device 失效
    利用子采样解码网格的最大似然解码方法及相应的解码装置

    公开(公告)号：US5329537A

    公开(公告)日：1994-07-12

    申请号：US7140

    申请日：1993-01-21

    申请人： Michel Alard ,  Damien Castelain ,  Jean-Francois Helard

    发明人： Michel Alard ,  Damien Castelain ,  Jean-Francois Helard

    IPC分类号： H03M13/41 ,  G06F11/10 ,  H03M13/12

    CPC分类号： H03M13/41

    摘要： Decoding apparatus provides the maximum likelihood decoding of a sequence of samples of the type implementing a Viterbi type of decision algorithm that defines an initial decoding trellis. Sub-sampling apparatus sub-samples the initial trellis by a ratio p to preserve nodes corresponding to one sample out of p consecutive samples. This sub-sampling apparatus associates a p order antecedent node to each preserved node. Trace-back apparatus traces an optimal path back in the sub-sampled trellis by associating the p order antecedent node for each preserved node. The trace back apparatus designates at least the last two nodes of the optimal path. Over-sampling apparatus over-samples the designation of the last two nodes of the optimal path. The factor p is an integer greater than 1 selected so that there is a single path between a node and its p order antecedent in the initial trellis. Hence the bit rate is increased by a factor p, without loss of information.

    摘要翻译： 解码装置提供对实现定义初始解码网格的维特比类型的决策算法的类型的样本序列的最大似然解码。 次采样设备对初始格架进行子采样比例p，以保存对应于p个连续采样中的一个样本的节点。 该子采样装置将p阶前置节点与每个保留的节点相关联。 追溯装置通过将每个保留的节点的p阶前置节点相关联来追踪子采样网格中的最优路径。 回溯装置至少指定最佳路径的最后两个节点。 过采样设备对最佳路径的最后两个节点的指定进行过采样。 因子p是大于1的整数，因此在初始网格中节点与其p阶前置之间存在单个路径。 因此，比特率增加因子p，而不会丢失信息。

    PEAK-TO-AVERAGE POWER RATIO REDUCTION IN A MULTICARRIER SIGNAL
    6.
    发明申请
    PEAK-TO-AVERAGE POWER RATIO REDUCTION IN A MULTICARRIER SIGNAL 有权
    多功能信号中的峰值平均功率比减少

    公开(公告)号：US20120140836A1

    公开(公告)日：2012-06-07

    申请号：US13318853

    申请日：2010-05-04

    申请人： Jean-Francois Helard ,  Yves Louet ,  Irene Masinjara Mahafeno

    发明人： Jean-Francois Helard ,  Yves Louet ,  Irene Masinjara Mahafeno

    IPC分类号： H04L27/28

    CPC分类号： H04L27/2618

    摘要： A method and apparatus for multicarrier transmission of a signal representing a source signal. The source signal includes symbols including a set of subcarriers, transmitted simultaneously and having pilot subcarriers intended for at least one processing operation for assisting and/or improving decoding in at least one receiver, and data subcarriers, the location in time-frequency space and a reference value of the pilot subcarriers being known to the at least one receiver. The method of transmission includes: a phase of modifying, for a given symbol, the reference value of at least one subset of the pilot subcarriers, by correction data configured to correct phase and/or amplitude for each of the pilot subcarriers of the subset, so as to minimise peak-to-average power ratio, the correction data taking at least three distinct values, a transition between the values of two successive pilot subcarriers of the subset on a frequency axis being constant.

    摘要翻译： 用于表示源信号的信号的多载波传输的方法和装置。 源信号包括包括一组子载波的符号，它们同时传输并且具有旨在用于至少一个处理操作的导频子载波，用于辅助和/或改善至少一个接收机中的解码，以及数据副载波，时频空间中的位置和 导频子载波的参考值是至少一个接收机已知的。 传输方法包括：通过被配置为校正子集的每个导频子载波的相位和/或幅度的校正数据，修改针对给定符号的导频子载波的至少一个子集的参考值的相位， 为了最小化峰值与平均功率比，校正数据取至少三个不同的值，频率轴上子集的两个连续的导频子载波的值之间的转变是恒定的。

    Equalizing method in receivers using a combination of multiple carrier and code division multiple access modulating techniques
    8.
    发明授权
    Equalizing method in receivers using a combination of multiple carrier and code division multiple access modulating techniques 失效
    使用多载波和码分多址调制技术的组合的接收机中的均衡方法

    公开(公告)号：US07023265B1

    公开(公告)日：2006-04-04

    申请号：US10088284

    申请日：2000-09-14

    申请人： Jean-Francois Helard ,  Jean-Yves Baudais

    发明人： Jean-Francois Helard ,  Jean-Yves Baudais

    IPC分类号： H04K1/10

    CPC分类号： H04L5/026 ,  H04L25/03159 ,  H04L2025/03414 ,  H04L2025/03522 ,  H04L2025/03605

    摘要： The invention concerns a method for receiving a signal using a multiple carrier and code division multiple access modulation, comprising a demodulating step by application of a mathematical transform of the temporal domain to the frequency domain, a step which consists in equalizing the transformed signal and a step which consists in despreading the equalized signal. The invention is characterised in that said equalizing step takes into account, for each of the components of said transformed signal, perturbations affecting the carrier bearing said component and at least one other of said carriers and at least some of said spread codes.

    摘要翻译： 本发明涉及一种使用多载波和码分多址调制来接收信号的方法，包括通过将时域的数学变换应用于频域的解调步骤，该步骤包括将经变换的信号和 其中包括解扩均衡信号。 本发明的特征在于，对于所述变换的信号的每个分量，所述均衡步骤考虑影响承载所述分量的载波和所述载波中的至少一个以及所述扩展码中的至少一些的扰动。

    Multi-carrier symbol synchronization
    9.
    发明授权
    Multi-carrier symbol synchronization 有权
    多载波符号同步

    公开(公告)号：US06459744B1

    公开(公告)日：2002-10-01

    申请号：US09101881

    申请日：1998-11-03

    申请人： Jean-Francois Helard ,  Pierre Combelles ,  Damien Castelain

    发明人： Jean-Francois Helard ,  Pierre Combelles ,  Damien Castelain

    IPC分类号： H04L700

    CPC分类号： H04L5/0048 ,  H04L27/2605 ,  H04L27/2613 ,  H04L27/2662 ,  H04L27/2665 ,  H04L27/2679

    摘要： A method for the time synchronization of a multi-carrier signal receiver consisting of a sequence of symbols each formed by a plurality of carrier frequencies. Each carrier frequency is modulated by a modulation coefficient. The position of some of said carrier frequencies in the time-frequency space is known to the receiver, and said frequencies are reference carrier frequencies. Each reference carrier frequency bears a reference coefficient with a value that is known to the receiver. The method includes a fine synchronization step, wherein the signal transmission channel impulse response is estimated on the basis of reference coefficients belonging to at least two received symbols. The beginning of the useful portion of each of the symbols is determined, and/or a receiver clock is controlled by analyzing the estimate of said impulse response.

    摘要翻译： 一种用于由多个载波频率形成的符号序列组成的多载波信号接收机的时间同步的方法。 每个载波频率由调制系数调制。 时间 - 频率空间中的一些所述载波频率的位置对于接收机是已知的，并且所述频率是参考载波频率。 每个参考载波频率具有接收机已知的值的参考系数。 该方法包括精细同步步骤，其中基于属于至少两个接收符号的参考系数来估计信号传输信道脉冲响应。 确定每个符号的有用部分的开始，和/或通过分析所述脉冲响应的估计来控制接收机时钟。