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    Method for receiving a signal in a digital radio frequency communication system
    1.
    发明授权
    Method for receiving a signal in a digital radio frequency communication system 失效
    用于在数字射频通信系统中接收信号的方法

    公开(公告)号：US5818887A

    公开(公告)日：1998-10-06

    申请号：US687882

    申请日：1996-07-26

    申请人： Thomas A. Sexton ,  Fuyun Ling ,  Kenneth A. Stewart

    发明人： Thomas A. Sexton ,  Fuyun Ling ,  Kenneth A. Stewart

    IPC分类号： H04L27/01 ,  H04B1/7085 ,  H04L7/00 ,  H04L7/033 ,  H04L7/10 ,  H04L27/22 ,  H04Q7/38

    CPC分类号： H04B1/7085 ,  H04L7/0331

    摘要： The method includes acquiring a signal (501); inputting (502), at a first time, a received symbol to a demodulator having a plurality of outputs to produce a set of early outputs; inputting (504), at a second time, the received symbol to the demodulator to produce a set of on-time outputs; inputting (505), at a third time, the received symbol to the demodulator to produce a set of late outputs; and comparing (506) at least one output in the set of early outputs with at least one output in the set of late outputs to produce a timing measure.

    摘要翻译： 该方法包括获取信号（501）; 在第一时间将接收到的符号输入（502）到具有多个输出的解调器以产生一组早期输出; 在第二时间将所接收的符号输入（504）到解调器以产生一组导通时间输出; 在第三时间将接收到的符号输入（505）到解调器以产生一组后期输出; 以及将所述早期输出集合中的至少一个输出与所述一组晚期输出中的至少一个输出进行比较（506）以产生定时测量。

    Channel estimation in a communication system
    2.
    发明授权
    Channel estimation in a communication system 失效
    通信系统中的信道估计

    公开(公告)号：US5687198A

    公开(公告)日：1997-11-11

    申请号：US582691

    申请日：1996-01-04

    申请人： Thomas A. Sexton ,  Fuyun Ling

    发明人： Thomas A. Sexton ,  Fuyun Ling

    IPC分类号： H04L27/18 ,  H04B1/10 ,  H04B7/26 ,  H04L7/02 ,  H04L25/02 ,  H04B1/76

    CPC分类号： H04L7/0062 ,  H04L25/0202 ,  H04L25/0214 ,  H04L25/0236

    摘要： A receiver (200, 400) implements improved channel estimation. The receiver (200, 400) demodulates a transmitted signal, and makes an initial channel estimate (115). The receiver (200, 400) then makes a hard decision (301) as to whether the channel estimate was correct and groups samples representing the decision. A vector sum of the group of samples is computed (302), and each sample is compared to the vector sum (303). The sample having the largest projection on the vector sum is retained (304), and the other samples are considered noise, and are thus discarded (305). After obtaining a predetermined number of retained samples (306), the retained samples are used to generate an new channel estimate (226). Since the noisy estimates are discarded, the new channel estimate (226) contains fewer errors than the initial channel estimate (115). The new channel estimate (226) is used to generate decoded data (250).

    摘要翻译： 接收机（200,400）实现改进的信道估计。 接收机（200,400）对发送的信号进行解调，并进行初始信道估计（115）。 接收机（200,400）然后作出关于信道估计是否正确以及表示该决定的组样本的硬判决（301）。 计算样本组的矢量和（302），并将每个样本与矢量和（303）进行比较。 保留矢量和上具有最大投影的样本（304），其他样本被认为是噪声，因此被丢弃（305）。 在获得预定数量的保留样本（306）之后，使用保留的样本来产生新的信道估计（226）。 由于噪声估计被丢弃，所以新信道估计（226）包含的误差小于初始信道估计（115）。 新信道估计（226）用于生成解码数据（250）。

    Method and apparatus for offset frequency estimation for a coherent receiver
    3.
    发明授权
    Method and apparatus for offset frequency estimation for a coherent receiver 失效
    用于相干接收机的偏移频率估计的方法和装置

    公开(公告)号：US5640431A

    公开(公告)日：1997-06-17

    申请号：US402260

    申请日：1995-03-10

    申请人： Eugene J. Bruckert ,  Fuyun Ling ,  Thomas A. Sexton

    发明人： Eugene J. Bruckert ,  Fuyun Ling ,  Thomas A. Sexton

    IPC分类号： H04L27/00 ,  H04L27/233 ,  H04K1/00 ,  H03L7/06

    CPC分类号： H04B1/7087 ,  H04B1/707 ,  H04B1/709 ,  H04L27/2332 ,  H04L2027/003 ,  H04L2027/0046 ,  H04L2027/0065 ,  H04L2027/0079

    摘要： A method and apparatus for improved offset frequency estimation includes in a first embodiment a receiver (100) for coherent reception of a signal having known reference information, the receiver including an extractor (106) for extracting the reference information (107) from the signal, and an offset frequency estimator (110). The offset frequency estimator (110) includes a filter (121) for filtering the reference information and outputting a filtered reference sequence; a correlator (122, 124) for correlating the filtered reference sequence against a predetermined reference signal to form correlation values; and a peak detector (126) for determining an offset frequency estimate (131) from the correlation values. Other embodiments are also shown.

    摘要翻译： 一种用于改进的偏移频率估计的方法和装置包括在第一实施例中用于相干接收具有已知参考信息的信号的接收机（100），该接收机包括用于从信号中提取参考信息（107）的提取器（106） 和偏移频率估计器（110）。 偏移频率估计器（110）包括滤波器（121），用于对参考信息进行滤波并输出滤波后的参考序列; 相关器（122,124），用于将滤波的参考序列与预定的参考信号相关，以形成相关值; 和用于根据相关值确定偏移频率估计（131）的峰值检测器（126）。 还示出了其他实施例。

    Method and apparatus for coherent communication reception in a spread-spectrum communication system
    4.
    发明授权
    Method and apparatus for coherent communication reception in a spread-spectrum communication system 失效
    用于扩频通信系统中相干通信接收的方法和装置

    公开(公告)号：US5619524A

    公开(公告)日：1997-04-08

    申请号：US396453

    申请日：1995-02-28

    申请人： Fuyun Ling ,  Thomas A. Sexton ,  Gene Bruckert

    发明人： Fuyun Ling ,  Thomas A. Sexton ,  Gene Bruckert

    IPC分类号： H04L27/22 ,  H04B1/707 ,  H04J3/06 ,  H04L7/00 ,  H04L25/02 ,  H04L27/227 ,  H04K1/00 ,  H04B1/66

    CPC分类号： H04B1/7087 ,  H04B1/707 ,  H04J3/0605 ,  H04L25/0202 ,  H04L27/2276 ,  H04B1/7117 ,  H04B2201/70703 ,  H04B2201/70705

    摘要： A method and apparatus is provided for facilitating coherent communication reception. A received reference symbol coded spread spectrum communication signal is despread with a spreading code to derive a stream of reference samples and a stream of data samples. The channel response is estimated by utilizing the stream of reference samples. An offset frequency detector determines an offset to be applied to the received signal via a frequency locked loop, while a timing control compensates for slow timing drift and fast fading based on power estimates derived from the stream of reference samples and/or the stream of data samples. A rate estimator determines the rate at which the information was encoded, and the rate information is used to optimize the timing control, frequency offset detector and channel estimator. Thus an improved detection of estimated data symbols from the stream of received data samples is provided.

    摘要翻译： 提供了一种用于促进相干通信接收的方法和装置。 接收到的参考符号编码的扩展频谱通信信号用扩展码进行解扩，以导出参考样本流和数据采样流。 通过利用参考样本流来估计信道响应。 偏移频率检测器通过频率锁定环来确定要施加到接收信号的偏移，而定时控制基于从参考样本流和/或数据流导出的功率估计来补偿慢定时漂移和快衰落 样品。 速率估计器确定信息被编码的速率，速率信息用于优化定时控制，频率偏移检测器和信道估计器。 因此，提供了从接收的数据样本流中对估计数据符号的改进的检测。

    Channel handoff methods in wireless broadcast systems
    6.
    发明授权
    Channel handoff methods in wireless broadcast systems 有权
    无线广播系统中的信道切换方法

    公开(公告)号：US09554319B2

    公开(公告)日：2017-01-24

    申请号：US11828333

    申请日：2007-07-25

    申请人： Linbo Li ,  Ashok Mantravadi ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

    发明人： Linbo Li ,  Ashok Mantravadi ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

    IPC分类号： H04Q7/20 ,  H04W36/28 ,  H04W36/30 ,  H04W72/08

    CPC分类号： H04W36/28 ,  H04W36/30 ,  H04W72/085

    摘要： Systems and methodologies are described that facilitate monitoring RF channels in a wireless communication environment to determine whether one or more channels comprise a forward-link-only (FLO) signal. A receiver can receive a first RF channel with a FLO signal and can monitor other RF channels for FLO signals. Upon a determination that a monitored RF channel comprises a FLO signal, the receiver can switch between the first RF channel and the monitored RF channel, employing information on current MLC decoding status, to facilitate providing seamless reception of the FLO signal, which can be superframe synchronized between RF channels. FLO signal detection can be performed using one or more of a wide-area identification channel energy detection protocol and a wide-area overhead information symbol decoding error detection protocol.

    摘要翻译： 描述了便于在无线通信环境中监视RF信道以确定一个或多个信道是包括仅前向链路（FLO）信号的系统和方法。 接收机可以接收具有FLO信号的第一RF信道，并且可以监视FLO信号的其他RF信道。 在确定被监视的RF信道包括FLO信号之后，接收机可以使用关于当前MLC解码状态的信息在第一RF信道和被监控的RF信道之间切换，以便于提供FLO信号的无缝接收，其可以是超帧 在RF信道之间同步。 可以使用广域识别信道能量检测协议和广域开销信息符号解码错误检测协议中的一个或多个来执行FLO信号检测。

    INITIALIZATION OF TIMING RECOVERY AND DECISION-FEEDBACK EQUALIZATION IN A RECEIVER
    7.
    发明申请
    INITIALIZATION OF TIMING RECOVERY AND DECISION-FEEDBACK EQUALIZATION IN A RECEIVER 审中-公开
    定时恢复的初始化和接收方的决策反馈均衡

    公开(公告)号：US20150326382A1

    公开(公告)日：2015-11-12

    申请号：US14763798

    申请日：2013-01-28

    申请人： Jian LI ,  Yisheng XUE ,  Michael M. FAN ,  Jilei HOU ,  Yin Huang ,  Fuyun Ling ,  QUALCOMM INCORPORATED

    发明人： Jian Li ,  Yin Huang ,  Yisheng Xue ,  Michael M. Fan ,  Fuyun Ling ,  Jilei Hou

    IPC分类号： H04L7/00 ,  H04L25/03

    CPC分类号： H04L7/0004 ,  H04L25/03 ,  H04L25/0305 ,  H04L25/0307 ,  H04L2025/03656

    摘要： A method of initializing a receiver is performed during an initialization mode. Timing offset values for a timing recovery circuit are repeatedly selected. For each selected timing offset value, timing recovery is performed using the timing offset value and groups of weights for a decision feedback equalizer are repeatedly selected. Each selected group of weights is used to perform blind decision feedback equalization. For each selected group of weights, a metric indicating data reception quality is computed. A timing offset value and a group of weights are chosen based on the computed metrics.

    摘要翻译： 在初始化模式期间执行初始化接收机的方法。 定时恢复电路的定时偏移值被重复选择。 对于每个选择的定时偏移值，使用定时偏移值执行定时恢复，并且重复地选择用于判决反馈均衡器的权重组。 每个选择的权重组用于执行盲判决反馈均衡。 对于每个选择的权重组，计算指示数据接收质量的度量。 基于所计算的度量来选择定时偏移值和权重组。