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36 条记录 (耗时 0.021 秒)

    Method and apparatus for silent frame detection in a GSM communications system
    1.
    发明授权
    Method and apparatus for silent frame detection in a GSM communications system 有权
    GSM通信系统中静音帧检测的方法和装置

    公开(公告)号：US07245878B2

    公开(公告)日：2007-07-17

    申请号：US10696397

    申请日：2003-10-28

    申请人： Jingdong Lin ,  Yan Zhang ,  Jiayi Zhuang ,  Jian Cheng

    发明人： Jingdong Lin ,  Yan Zhang ,  Jiayi Zhuang ,  Jian Cheng

    IPC分类号： H04B1/00 ,  H04B15/00

    CPC分类号： H04B17/336

    摘要： A method of detecting a silent frame at a mobile station in a GSM transmission is disclosed. The method comprises first receiving a data burst intended for the mobile station. Then, a signal-to-interference-and-noise ratio (SINR) is determined for the data burst. If the SINR is below a predetermined threshold, then the data burst is determined as from a silent frame.

    摘要翻译： 公开了一种在GSM传输中检测移动台上的无声帧的方法。 该方法包括首先接收针对移动台的数据突发。 然后，确定数据脉冲串的信号与干扰噪声比（SINR）。 如果SINR低于预定阈值，则从无声帧确定数据脉冲串。

    Method and apparatus for silent frame detection in a GSM communications system
    2.
    发明申请
    Method and apparatus for silent frame detection in a GSM communications system 有权
    GSM通信系统中静音帧检测的方法和装置

    公开(公告)号：US20050090293A1

    公开(公告)日：2005-04-28

    申请号：US10696397

    申请日：2003-10-28

    申请人： Jingdong Lin ,  Yan Zhang ,  Jiayi Zhuang ,  Jian Cheng

    发明人： Jingdong Lin ,  Yan Zhang ,  Jiayi Zhuang ,  Jian Cheng

    IPC分类号： H04B1/38 ,  H04B17/00 ,  H04M1/00

    CPC分类号： H04B17/336

    摘要： A method of detecting a silent frame at a mobile station in a GSM transmission is disclosed. The method comprises first receiving a data burst intended for the mobile station. Then, a signal-to-interference-and-noise ratio (SINR) is determined for the data burst. If the SINR is below a predetermined threshold, then the data burst is determined as from a silent frame.

    摘要翻译： 公开了一种在GSM传输中检测移动台上的无声帧的方法。 该方法包括首先接收针对移动台的数据突发。 然后，确定数据脉冲串的信号与干扰噪声比（SINR）。 如果SINR低于预定阈值，则从无声帧确定数据脉冲串。

    Method and apparatus for frequency tracking based on recovered data
    4.
    发明授权
    Method and apparatus for frequency tracking based on recovered data 有权
    基于恢复数据进行频率跟踪的方法和装置

    公开(公告)号：US07251300B2

    公开(公告)日：2007-07-31

    申请号：US10744049

    申请日：2003-12-22

    申请人： Jiayi Zhuang ,  Jingdong Lin ,  Yueheng Sun

    发明人： Jiayi Zhuang ,  Jingdong Lin ,  Yueheng Sun

    IPC分类号： H04L27/06

    CPC分类号： H04L5/06 ,  H04L5/22 ,  H04L5/26 ,  H04L2027/0065

    摘要： A method of frequency tracking based on recovered data, for use in an automatic frequency control subsystem at the receiver of a mobile station, is disclosed. The frequency tracking mechanism derives frequency error information from the recovered data to determine the adjustment needed at the mobile station's local voltage controlled oscillator in order to track the frequency of the base station.

    摘要翻译： 公开了一种基于恢复数据的频率跟踪方法，用于移动台接收机处的自动频率控制子系统。 频率跟踪机制从恢复的数据导出频率误差信息，以确定移动台的局部压控振荡器所需的调整，以便跟踪基站的频率。

    Method and system for modifying branch metric of Viterbi decoder for uncorrelated signals
    7.
    发明申请
    Method and system for modifying branch metric of Viterbi decoder for uncorrelated signals 审中-公开
    用于修改维特比解码器用于不相关信号的分支度量的方法和系统

    公开(公告)号：US20050141651A1

    公开(公告)日：2005-06-30

    申请号：US10867273

    申请日：2004-06-14

    申请人： Jiayi Zhuang ,  Shengguan Hu ,  Jingdong Lin ,  Datong Chen

    发明人： Jiayi Zhuang ,  Shengguan Hu ,  Jingdong Lin ,  Datong Chen

    IPC分类号： H03D1/00 ,  H04L1/00 ,  H04L25/02 ,  H04L25/06 ,  H04L27/06

    CPC分类号： H04L1/0071 ,  H04L1/0054 ,  H04L25/0202 ,  H04L25/067

    摘要： The present disclosure provides simple methods and systems for generating modified branch metrics for the Viterbi decoder so that the decoder can decode the uncorrelated incoming signals without the influence of either the signal power level or the noise variance. The proposed branch metrics noticeably improve the performance of the Viterbi algorithm in such cases. The present disclosure also provides methods and systems for reducing the length of the demodulated symbols for efficient computation. In an exemplary method, it is shown that the only requirement of the proposed modified branch metric, in addition to the traditional branch metric requirements, is the computation of the noise energy. In another exemplary system, an arrangement of circuit modules offers an implementation of one of the embodiments of the proposed method.

    摘要翻译： 本公开提供了用于生成用于维特比解码器的修改的分支度量的简单方法和系统，使得解码器可以在不受信号功率电平或噪声方差的影响的情况下解码不相关的输入信号。 在这种情况下，所提出的分支度量显着提高了维特比算法的性能。 本公开还提供了用于减少用于有效计算的解调符号的长度的方法和系统。 在示例性方法中，示出了除了传统的分支度量要求之外，所提出的修改的分支度量的唯一要求是噪声能量的计算。 在另一示例性系统中，电路模块的布置提供了所提出的方法的实施例之一的实现。

    Method and apparatus for automatic frequency correction
    10.
    发明申请
    Method and apparatus for automatic frequency correction 有权
    自动频率校正方法和装置

    公开(公告)号：US20060233153A1

    公开(公告)日：2006-10-19

    申请号：US11326043

    申请日：2006-01-05

    申请人： Jian Cheng ,  Jingdong Lin

    发明人： Jian Cheng ,  Jingdong Lin

    IPC分类号： H04J3/06

    CPC分类号： H04L27/2271 ,  H04L2027/0028 ,  H04L2027/0038 ,  H04L2027/0061 ,  H04L2027/0065 ,  H04L2027/0075

    摘要： A technique is provided for automatic frequency offset correction in a wireless communication system. After demodulating and decoding a received signal in a receiver, channel estimation is also performed. The technique further includes re-encoding and re-modulating the decoded and demodulated signal with a coding and modulation scheme different from the received signal. The signal is reconstructed signal on the basis of the re-encoded and re-modulated signal and estimated channel characteristics. A frequency error is estimated based on the reconstructed signal and the original received signal. A threshold for a comparator is determined on the basis of the estimated offset amount determined by the comparison threshold and the estimated frequency offset.

    摘要翻译： 提供了一种用于无线通信系统中的自动频偏校正的技术。 在对接收机中的接收信号进行解调和解码之后，还执行信道估计。 该技术还包括用与接收信号不同的编码和调制方案对解码和解调信号进行重新编码和重新调制。 信号是基于重新编码和重新调制的信号和估计的信道特性的重构信号。 基于重构信号和原始接收信号估计频率误差。 基于由比较阈值和估计频率偏移确定的估计偏移量来确定比较器的阈值。