利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

8 条记录 (耗时 0.033 秒)

    Differential space-time block coding
    2.
    发明申请
    Differential space-time block coding 审中-公开
    差分空时块编码

    公开(公告)号：US20050063483A1

    公开(公告)日：2005-03-24

    申请号：US10451274

    申请日：2000-12-20

    申请人： Rui Wang ,  Chao Wang ,  Ming Jia ,  Youri Shinakov ,  Alexandre Chloma ,  Mikhail Bakouline ,  Vitali Kreindeline

    发明人： Rui Wang ,  Chao Wang ,  Ming Jia ,  Youri Shinakov ,  Alexandre Chloma ,  Mikhail Bakouline ,  Vitali Kreindeline

    IPC分类号： H04L1/06 ,  H04L1/02

    CPC分类号： H04L1/0618

    摘要： A differential space-time block coder produces successive space-time blocks of symbols from M-PSK symbols to be encoded, in accordance with an orthogonal matrix and a normalization factor. Differentially encoded space-time output blocks, for transmission via a plurality of transmit antennas (16, 18) of a wireless communications system, are produced by multiplying (42) each space-time block from the space-time block coder (40) by the respective previous (44) differentially encoded space-time output block. Decoding is independent of channel estimation, and the arrangement is simple, avoids error propagation, and is applicable to different numbers of transmit antennas.

    摘要翻译： 差分时空块编码器根据正交矩阵和归一化因子从待编码的M-PSK符号产生符号的连续空时块。 通过将无线通信系统的多个发射天线（16,18）进行发送的差分编码空时输出块通过将来自时空块编码器（40）的每个时空块乘以（42）乘以 各个先前的（44）差分编码的空时输出块。 解码与信道估计无关，布置简单，避免了误差传播，适用于不同数量的发射天线。

    Timing recovery and frame synchronization in communications systems
    3.
    发明授权
    Timing recovery and frame synchronization in communications systems 失效
    通信系统中的定时恢复和帧同步

    公开(公告)号：US5963603A

    公开(公告)日：1999-10-05

    申请号：US688911

    申请日：1996-07-31

    申请人： Yong Li ,  Rui Wang ,  Iouri Trofimov ,  Alexandre Chloma ,  Mikhail Bakouline ,  Vitali Kreindeline

    发明人： Yong Li ,  Rui Wang ,  Iouri Trofimov ,  Alexandre Chloma ,  Mikhail Bakouline ,  Vitali Kreindeline

    IPC分类号： H04L27/22 ,  H04B7/26 ,  H04L7/00 ,  H04L7/02 ,  H04L7/033 ,  H03D1/00

    CPC分类号： H04L7/0054 ,  H04L7/0334 ,  H04L7/0029 ,  H04L7/007

    摘要： Timing recovery, with or without frame synchronization, in a cellular TDMA communications system is carried out by a method comprising estimating indirect variables, which embody sampling delay information, of a linear complex vector using a maximum likelihood criterion, and recovering the sampling delay from the estimated indirect variables. For recovering the sampling delay, an optimal procedure and three sub-optimal, but computationally simpler, procedures are described, along with their physical implementations. For frame synchronization, the timing recovery sampling delay is supplemented by a number of sample spacings determined by a maximum of signal amplitudes of a plurality of samples, calculated from the estimated indirect variables and the timing recovery sampling delay.

    摘要翻译： 在蜂窝TDMA通信系统中，具有或不具有帧同步的定时恢复是通过一种方法来执行的，该方法包括使用最大似然准则来估计线性复数向量的间接变量（其包含采样延迟信息），并且从 估计间接变量。 为了恢复采样延迟，描述了最佳过程和三个次优的，但计算上更简单的过程，以及它们的物理实现。 对于帧同步，定时恢复采样延迟由由估计的间接变量和定时恢复采样延迟计算的多个采样的信号幅度的最大值确定的多个采样间隔补充。

    Pseudo random number sequence synchronization in communications systems
    5.
    发明授权
    Pseudo random number sequence synchronization in communications systems 失效
    通信系统中的伪随机数序列同步

    公开(公告)号：US5754603A

    公开(公告)日：1998-05-19

    申请号：US688670

    申请日：1996-07-29

    申请人： Philip H. Thomas ,  Gang Li ,  Rui Wang ,  Iouri Trofimov ,  Alexandre Chloma ,  Mikhail Bakouline ,  Vitali Kreindeline

    发明人： Philip H. Thomas ,  Gang Li ,  Rui Wang ,  Iouri Trofimov ,  Alexandre Chloma ,  Mikhail Bakouline ,  Vitali Kreindeline

    IPC分类号： H04B1/7075 ,  H04B1/7077 ,  H04L7/04 ,  H04L7/00

    CPC分类号： H04B1/70752 ,  H04L7/043 ,  H04B1/70775

    摘要： A method of synchronizing to a pseudo random sequence, which can be generated by a linear feedback shift register having k stages and p intermediate taps, where k and p are positive integers and k>p, and a synchronization arrangement for carrying out the method are described. A received symbol sequence is supplied to a k-stage shift register with p intermediate taps in positions corresponding to the p taps of the linear feedback shift register. A respective correlation signal is recursively added at an input for the received symbol sequence and at each intermediate tap. Each correlation signal is produced by correlating at least two signals from said input, intermediate taps, and output other than the signal to which the respective correlation signal is added. The invention is particularly applicable to pilot synchronization in CDMA terminals.

    摘要翻译： 一种与伪随机序列同步的方法，其可以由具有k个级和p个中间抽头的线性反馈移位寄存器生成，其中k和p是正整数，k> p，并且用于执行该方法的同步装置是 描述。 接收的符号序列被提供给具有对应于线性反馈移位寄存器的p抽头的位置中的p个中间抽头的k级移位寄存器。 相应的相关信号在接收的符号序列的输入端和每个中间抽头处被递归地相加。 通过将来自所述输入，中间抽头和输出的至少两个信号与相关相关信号相加的信号相关联来产生每个相关信号。 本发明特别适用于CDMA终端中的导频同步。

    Timing tracking in communications systems
    7.
    发明授权
    Timing tracking in communications systems 失效
    通信系统中的定时跟踪

    公开(公告)号：US5832046A

    公开(公告)日：1998-11-03

    申请号：US681473

    申请日：1996-07-23

    申请人： Yong Li ,  Rui Wang ,  Iouri Trofimov ,  Alexandre Chloma ,  Mikhail Bakouline ,  Vitali Kreindeline

    发明人： Yong Li ,  Rui Wang ,  Iouri Trofimov ,  Alexandre Chloma ,  Mikhail Bakouline ,  Vitali Kreindeline

    IPC分类号： H04L7/00 ,  H04L7/02

    CPC分类号： H04L7/0054 ,  H04L7/0062

    摘要： In a TDMA cellular communications system, optimal sampling of symbols in an information sequence is maintained by a method of timing tracking in which, recursively, indirect variables of a linear complex vector are estimated from received samples and previous estimates of the indirect variables, the sampling delay, and a complex fading factor, and the complex fading factor and the sampling delay are estimated by non-linear transformations of the estimated indirect variables. The timing tracking follows a timing recovery process which produces initial estimates. An implementation of the method uses a Kalman filter having constant filter gains and a transformation of the received samples and sampling delay to a reduced time interval.

    摘要翻译： 在TDMA蜂窝通信系统中，通过定时跟踪的方法来维持信息序列中的符号的最佳采样，其中，从接收的采样和间接变量的先前估计来估计线性复矢量的递归间接变量，采样 延迟和复杂衰落因子，并且通过估计的间接变量的非线性变换来估计复数衰落因子和采样延迟。 定时跟踪遵循产生初始估计的定时恢复过程。 该方法的实现使用具有恒定滤波器增益的卡尔曼滤波器和接收样本的变换和采样延迟到缩短的时间间隔。

    Synchronization to pseudo random number sequence with sign ambiguity in communications systems
    8.
    发明授权
    Synchronization to pseudo random number sequence with sign ambiguity in communications systems 失效
    通信系统中符号模糊的伪随机数序列同步

    公开(公告)号：US5754604A

    公开(公告)日：1998-05-19

    申请号：US689040

    申请日：1996-07-30

    申请人： Gang Li ,  Rui Wang ,  Iouri Trofimov ,  Alexandre Chloma ,  Mikhail Bakouline ,  Vitali Kreindeline

    发明人： Gang Li ,  Rui Wang ,  Iouri Trofimov ,  Alexandre Chloma ,  Mikhail Bakouline ,  Vitali Kreindeline

    IPC分类号： H04B1/707 ,  H04B1/7075 ,  H04B7/26 ,  H04J13/00 ,  H04L7/00 ,  H04L7/02

    CPC分类号： H04B1/70752 ,  H04B1/70753 ,  H04J13/0022

    摘要： A method is disclosed for synchronizing, in the presence of sign ambiguity, to a pseudo random maximal length sequence having a characteristic polynomial of order k with a coefficients vector A given by: A=�1 a.sub.1 a.sub.2 . . . a.sub.k-1 1! where each of the coefficients a.sub.1 to a.sub.k-1 is 1 for an intermediate tap location and otherwise is 0. A received symbol sequence is supplied to and shifted through a K=k+1 stage shift register with P intermediate taps in positions determined by a coefficients vector A.sub.in given by: A.sub.in =�1 a.sub.1 (a.sub.1 .sym.a.sub.2) (a.sub.2 .sym.a.sub.3) . . . (a.sub.k-2 .sym.a.sub.k-1) a.sub.k-1 1! where a.sub.1 and a.sub.k-1 are the inverse of a.sub.1 and a.sub.k-1 respectively and .sym. denotes a modulo-2 sum, whereby the shift register has P intermediate taps where P is a positive integer less than K. A respective correlation signal is recursively added at an input for the received symbol sequence and at each intermediate tap. Each correlation signal is produced by correlating the P+1 signals from said input, intermediate taps, and output other than the signal to which the respective correlation signal is added. The invention is particularly applicable to pilot synchronization in CDMA terminals.

    摘要翻译： 公开了一种用于在符号歧义存在的情况下同步具有具有系数向量A的特征多项式的伪随机最大长度序列的方法，该系数向量A由下式给出：A = [a1a a2。 。 。 ak-1 1]其中，对于中间抽头位置，系数a1至ak-1中的每一个为1，否则为0.接收到的符号序列被提供给并通过具有P个中​​间抽头的K = k + 1级移位寄存器 在由Ain = [1 + E，ovs a + EE 1（a1（+）a2）（a2（+）a3）给出的系数矢量Ain确定的位置。 。 。 （ak-2（+）ak-1）+ E，ovs a + EE k-1 1]其中+ E，ovs a + EE 1和+ E，ov a + EE k-1是a1和ak的倒数 -1，（+）表示模2和，由此移位寄存器具有P个中​​间抽头，其中P是小于K的正整数。相应的相关信号在接收符号序列的输入处和每个相关信号递归地相加 中间水龙头 每个相关信号是通过将来自所述输入的P + 1信号，中间抽头和除了相关相关信号所添加的信号之外的输出相关而产生的。 本发明特别适用于CDMA终端的导频同步。