知搜-全球专利检索

  1. Login
  2. Sign Up

Search Results

528 records (took 0.032 seconds)

    Method and system of iterative coding/decoding of digital data streams coded by spatio-temporal combinations, in multiple transmission and reception
    91.
    发明申请
    Method and system of iterative coding/decoding of digital data streams coded by spatio-temporal combinations, in multiple transmission and reception 有权
    在多重传输和接收中，通过空间 - 时间组合编码的数字数据流的迭代编码/解码方法和系统

    公开(公告)号：US20020168017A1

    公开(公告)日：2002-11-14

    申请号：US10075721

    申请日：2002-02-14

    Inventor： Antoine Berthet ,  Raphael Visoz

    IPC: H04B007/02

    CPC classification number: H04L25/03171 ,  H03M13/25 ,  H03M13/2957 ,  H04L1/0048 ,  H04L1/005 ,  H04L1/0065 ,  H04L1/0618 ,  H04L25/03337

    Abstract: The invention relates to a method of coding and of decoding a digital data stream coded by spatio-temporal combinations, in multiple transmission and reception. On transmission, the initial stream (IDS) is subjected to an outer coding (A), a blockwise interleaving (B), a demultiplexing (C) over a plurality of pathways, to an inner coding nullm on each pathway, then transmitted on a plurality (null) of distinct antennas forming a space-diversity array. On reception, the coded symbol streams transmitted are observed (F) by means of a number null of reception antennas which is independent of the number of transmission antennas, the observed coded symbol streams 1 { MSDS r } r = 1 r = null are subjected to a process of turbo-detection by equalization and joint decoding (G), deinterleaving (H), outer decoding (I), interleaving (J), so as to generate an a priori information item (api) on the coded bits, which is reinjected (K) into the turbo-detection process. Application to the implementation of a universal radiofrequency interface, in particular for mobile radio telephony.

    Abstract translation: 本发明涉及一种在多重发送和接收中编码和解码由时空组合编码的数字数据流的方法。 在传输时，将初始流（IDS）在多个路径上进行外部编码（A），块交织（B），解复用（C），到每个路径上的内部编码＆amp; 在形成空间分集阵列的多个（nu）个不同天线上。 在接收时，通过与发送天线数目无关的数量nu的接收天线观察所发送的编码符号流（F），观察到的编码符号流 1 { MSDS r mo>} r = 1 / mi> = 通过均衡和联合解码（G），解交织（H），外部解码（I），交织（J）等进行turbo检测处理，以便生成先验信息项（api） 被重新注入（K）的编码比特进入涡轮检测过程。 应用于实现通用射频接口，特别是用于移动无线电话。

      Soft output metrics generation for symbol detectors
      92.
      发明授权
      Soft output metrics generation for symbol detectors 有权
      符号检测器的软输出量度生成

      公开(公告)号：US06480552B1

      公开(公告)日：2002-11-12

      申请号：US09275147

      申请日：1999-03-24

      Applicant: Andrea M. Tonello

      Inventor： Andrea M. Tonello

      IPC: H04L2302

      CPC classification number: H04L25/067 ,  H04L25/03171 ,  H04L25/03318 ,  H04L27/2331

      Abstract: A method for calculating soft outputs of a detector used in a receiver that is part of a communication system having either memory introducing modulators or memoryless modulators. The output of a soft output detector, also known as reliability information, provides a probability that a certain symbol was transmitted by a transmitter of the communication system or the probability that a bit within a transmitted symbol was transmitted by a transmitter.

      Abstract translation: 一种用于计算在作为具有存储器引入调制器或无记忆调制器的通信系统的一部分的接收机中使用的检测器的软输出的方法。 软输出检测器（也称为可靠性信息）的输出提供了通信系统的发射机发送特定符号的概率或由发射机发送发送符号内的位的概率。

      MAP receiver for high-speed numerical transmissions through rayleigh channels noisy and dispersive in time and frequency
      93.
      发明授权
      MAP receiver for high-speed numerical transmissions through rayleigh channels noisy and dispersive in time and frequency 失效
      MAP接收机用于通过蓝光通道进行高速数字传输，在时间和频率上有噪声和色散

      公开(公告)号：US6064703A

      公开(公告)日：2000-05-16

      申请号：US901981

      申请日：1997-07-29

      Applicant: Roberto Cusani ,  Enzo Baccarelli

      Inventor： Roberto Cusani ,  Enzo Baccarelli

      IPC: H04L25/03 ,  H04R1/10

      CPC classification number: H04L25/03171

      Abstract: The present invention relates to a receiver for high-speed numerical transmissions through Rayleigh channels noisy and dispersive in time and frequency in which an accurate estimate of the channel response is combined in an optimal manner with the received data sequence detection procedure. Specifically the a posteriori probability of the Markov chain of the states of the channel with intersymbolic interference are calculated recursively from the data received and from the updated channel estimate. The a posteriori probabilities calculated are used in turn by a Kalman estimator to record the channel variations. On the basis of the sequence of the calculated a posteriori probabilities the detection is then calculated symbol by symbol with the highest a posteriori probability having a small decision delay.

      Abstract translation: 本发明涉及一种用于通过瑞利频道进行高速数字传输的接收机，其在时间和频率上噪声和色散，其中信道响应的精确估计以最佳方式与所接收的数据序列检测过程组合。 具体来说，从收到的数据和更新的信道估计中递归地计算具有均匀间干扰的信道状态的马尔科夫链的后验概率。 计算的后验概率依次由卡尔曼估计器用于记录通道变化。 在计算出的后验概率的序列的基础上，然后用具有小的决策延迟的具有最高后验概率的符号来计算检测。

      Decision path reduction of M-ary tree-search detector
      94.
      发明授权
      Decision path reduction of M-ary tree-search detector 失效
      决策路径减少M型树搜索检测器

      公开(公告)号：US5892801A

      公开(公告)日：1999-04-06

      申请号：US810586

      申请日：1997-03-04

      Applicant: Kevin W. Schneider

      Inventor： Kevin W. Schneider

      IPC: H04L25/03 ,  H04L1/00 ,  H04L25/08

      CPC classification number: H04L25/03171 ,  H04L25/03216 ,  H04L25/03299 ,  H04L25/03324

      Abstract: A limited search variant of the fixed delay tree search detector is used to recover digital signals corrupted with intersymbol interference and additive noise. The limited search algorithm uses a variant of an equalizer decision device--a simple slicer--to reduce the number of paths that are considered by the tree search detector from M.sup.D+1 to either D+1 or 2.sup.D+1 paths, thereby significantly reducing the complexity of the tree-search detector. This limited search detector enjoys negligible loss in performance, compared with that of a full fixed delay tree search.

      Abstract translation: 使用固定延迟树搜索检测器的有限搜索变体来恢复以符号间干扰和加性噪声损坏的数字信号。 有限搜索算法使用均衡器决策设备（简单分片器）的变体，以将树搜索检测器认为的路径数量从MD + 1减少到D + 1或2D + 1路径，从而显着减少 树型检索器的复杂性。 与全固定延迟树搜索相比，该有限搜索检测器的性能损失可忽略不计。

      Multiple Symbol Noncoherent Soft Output Detector
      100.
      发明申请
      Multiple Symbol Noncoherent Soft Output Detector 有权

      公开(公告)号：US20170353334A1

      公开(公告)日：2017-12-07

      申请号：US15460070

      申请日：2017-03-15

      Applicant: Mojix, Inc.

      Inventor： Dariush Divsalar ,  Ramin Sadr

      IPC: H04L25/03

      CPC classification number: H04L25/03171

      Abstract: Multiple symbol noncoherent soft output detectors in accordance with embodiments of the invention are disclosed. In a number of embodiments, the multiple symbol noncoherent soft output detector uses soft metrics based on the Log Likelihood Ratio (LLR) of each symbol to provide information concerning the reliability of each detected symbol. One embodiment of the invention includes a receiver configured to receive and sample a phase modulated input signal, and a multiple symbol noncoherent soft output detector configured to receive the sampled input signal and to generate a soft metric indicative of the reliability of a detected symbol based upon observations over multiple symbols.

    Patent Agency Ranking