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    • 41. 发明授权
    • Directly optimizing evaluation measures in learning to rank
    • 直接优化学习排名评估指标
    • US08478748B2
    • 2013-07-02
    • US12237293
    • 2008-09-24
    • Jun XuTie-Yan LiuHang Li
    • Jun XuTie-Yan LiuHang Li
    • G06F17/30
    • G06F17/30687G06F17/30867
    • The present invention provides methods for improving a ranking model. In one embodiment, a method includes the step of obtaining queries, documents, and document labels. The process then initializes active sets using the document labels, wherein two active sets are established for each query, a perfect active set and an imperfect active set. Then, the process optimizes an empirical loss function by the use of the first and second active set, whereby parameters of the ranking model are modified in accordance to the empirical loss function. The method then updates the active sets with additional ranking data, wherein the updates are configured to work in conjunction with the optimized loss function and modified ranking model. The recalculated active sets provide an indication for ranking the documents in a way that is more consistent with the document metadata.
    • 本发明提供了改进排名模型的方法。 在一个实施例中,一种方法包括获得查询,文档和文档标签的步骤。 然后,该过程使用文档标签来初始化活动集合,其中为每个查询建立两个活动集合,完美的活动集合和不完全的活动集合。 然后,该过程通过使用第一和第二活动集来优化经验损失函数,由此根据经验损失函数修改排名模型的参数。 然后,该方法用附加排名数据更新活动集合,其中更新被配置为与优化的损失函数和修改的排名模型一起工作。 重新计算的活动集提供了以与文档元数据更一致的方式对文档进行排名的指示。
    • 42. 发明授权
    • Data transmission method and equipment
    • 数据传输方式和设备
    • US08458571B2
    • 2013-06-04
    • US12812091
    • 2008-04-30
    • Jin XuYuanli FangZhifeng YuanSong LiJun XuLiujun Hu
    • Jin XuYuanli FangZhifeng YuanSong LiJun XuLiujun Hu
    • H03M13/00
    • H04L1/0057H04L1/0052H04L1/0083
    • The present invention discloses a data transmission method and apparatus. The method comprises: segmenting data to be transmitted into information file segments with a length of Tb bits; performing forward error correction (FEC) coding for Tb information bit sequences composed of bits in same positions in a plurality of continuous information file segments to generate Tb check bit sequences, putting each bit of the check bit sequences in the same position in the check file segments as the corresponding information bit sequences; and transmitting each of the information file segments and check file segments according to their order; the number of bits contained in the information bit sequences being less than or equal to the maximum length of Kmax bits of the FEC-coded information bit sequences.
    • 本发明公开了一种数据传输方法和装置。 该方法包括:将要发送的数据分割成具有Tb比特长度的信息文件段; 对由多个连续信息文件段中的相同位置的位构成的Tb信息比特序列执行前向纠错(FEC)编码,以产生Tb校验比特序列,将校验比特序列的每个比特放在校验文件中的相同位置 段作为相应的信息位序列; 并根据其顺序发送每个信息文件段和检查文件段; 包含在信息比特序列中的比特数小于或等于FEC编码的信息比特序列的最大比特的最大长度。
    • 44. 发明授权
    • Decoding method and device for low density generator matrix codes
    • 低密度发生器矩阵码的解码方法和装置
    • US08438448B2
    • 2013-05-07
    • US12991628
    • 2008-10-14
    • Zhifeng YuanJun Xu
    • Zhifeng YuanJun Xu
    • H03M13/00
    • H03M13/1191H03M13/3761H03M13/616H04L1/0057
    • A decoding method for low density generator matrix codes is disclosed, which decodes a bit information sequence that is transmitted after encoding with LDGC, the method comprises: S1: filling L−K known bits in a received code word sequence R and deleting code word symbols erased by a channel in R, and getting Re; S2: deleting rows corresponding to the code word symbols erased by a channel from a transposed matrix Gldgct of an LDGC generator matrix, and getting Ge; S3: obtaining It according to relation Ge×It=Re; S4: obtaining st according to relation Gldgct(0:L−1,0:L−1)×It=st, and getting an original information sequence of K bits by deleting the filled L−K known bits from st. The present disclosure can significantly reduce the storage overhead of a decoder, accelerate the decoding speed, and allow LDGC to be more smartly used in high speed communication systems.
    • 公开了一种用于低密度发生器矩阵码的解码方法,其对用LDGC进行编码之后发送的比特信息序列进行解码,该方法包括:S1:在接收到的码字序列R中填充LK已知比特,并删除被删除的码字符号 R中的一个通道,并获得Re; S2:删除与LDGC生成矩阵的转置矩阵Gldgct中的通道擦除的码字符号相对应的行,得到Ge; S3:根据关系获得它们Ge×It = Re; S4:根据关系Gldgct(0:L-1,0:L-1)×It = st获取st,并通过从st删除填充的L-K已知比特得到K比特的原始信息序列。 本公开可以显着减少解码器的存储开销,加速解码速度,并且允许LDGC在高速通信系统中更加智能地使用。
    • 48. 发明申请
    • Method and System for MIMO Channel Information Feedback
    • MIMO信道反馈的方法和系统
    • US20120300868A1
    • 2012-11-29
    • US13577789
    • 2010-10-22
    • Yijian ChenWu YinYu Ngok LiJun XuXun Yang
    • Yijian ChenWu YinYu Ngok LiJun XuXun Yang
    • H04B7/06
    • H04L1/0025H04B7/063H04B7/0645H04L25/03898
    • The present invention discloses a method for Multiple Input Multiple Output (MIMO) channel information feedback, and the method includes: a terminal selecting part of column vectors for MIMO system feedback from a codebook matrix W corresponding to a Precoding Matrix Indicator (PMI) and marking the selected part of column vectors as Wpart; the terminal determining information O which represents high-precision vector quantification information of MIMO along with the part of column vectors Wpart according to a common representation relationship F, and feeding back the information O to a base station. The present invention also discloses a terminal and a base station which support MIMO. The present invention achieves high-precision and low-overhead channel information feedback and can well support multiple vector feedback needed by high rank (more layer multiplexing) MIMO transmission and high-precision feedback needed by low rank MIMO transmission simultaneously.
    • 本发明公开了一种多输入多输出(MIMO)信道信息反馈的方法,该方法包括:从对应于预编码矩阵指示符(PMI)的码本矩阵W中选择一部分用于MIMO系统反馈的列向量, 所选的部分列向量为Wpart; 终端确定信息O,其表示MIMO的高精度矢量量化信息以及根据公共表示关系F的列向量Wpart的一部分,并将信息O反馈到基站。 本发明还公开了一种支持MIMO的终端和基站。 本发明实现了高精度和低开销的信道信息反馈,并且可以很好地支持高秩(多层复用)MIMO传输和低秩MIMO传输所需的高精度反馈所需的多向量反馈。