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    Apparatus and method for demodulating a modulated signal
    81.
    发明授权
    Apparatus and method for demodulating a modulated signal 失效
    用于解调调制信号的装置和方法

    公开(公告)号：US5767738A

    公开(公告)日：1998-06-16

    申请号：US734225

    申请日：1996-10-21

    Applicant: Tyler A. Brown ,  Dennis J. Thompson ,  Fuyun Ling

    Inventor： Tyler A. Brown ,  Dennis J. Thompson ,  Fuyun Ling

    IPC: H04L27/22 ,  H04B1/707 ,  H04L1/00 ,  H04L27/227 ,  H04L27/233 ,  H03D3/00

    CPC classification number: H04L1/0059 ,  H04B1/707 ,  H04L27/227 ,  H04L27/233

    Abstract: A receiver (156) includes both a coherent and noncoherent demodulator. When the confidence that estimates of the channel is high, the coherent demodulator is implemented. When the confidence that estimates of the channel is low, the noncoherent demodulator is implemented. A controlling microprocessor (162) controls the selection process and also provides a signal (158) to enable the noncoherent demodulator in instances when noncoherent demodulation would most likely be better than coherent demodulation. As an example, such an instance would be immediately after handoff of a mobile station (505) from a source base-station (503) to a target base-station (502).

    Abstract translation: 接收机（156）包括相干和非相干解调器。 当信道估计值高的置信度时，实现了相干解调器。 当信道的估计信心低时，实现非相干解调器。 在非相干解调最有可能优于相干解调的情况下，控制微处理器（162）控制选择过程并且还提供信号（158）以使能非相干解调器。 作为示例，这样的实例将在移动站（505）从源基站（503）切换到目标基站（502）之后立即。

    Method and apparatus for coherent channel estimation in a communication system
    82.
    发明授权
    Method and apparatus for coherent channel estimation in a communication system 失效
    通信系统中相干信道估计的方法和装置

    公开(公告)号：US5754599A

    公开(公告)日：1998-05-19

    申请号：US582856

    申请日：1996-01-04

    Applicant: Fuyun Ling ,  Terry Michael Schaffner

    Inventor： Fuyun Ling ,  Terry Michael Schaffner

    IPC: H04J13/04 ,  H03M13/23 ,  H03M13/45 ,  H04L25/02 ,  H04L27/06

    CPC classification number: H04L25/0236 ,  H04L25/0214

    Abstract: Generally stated, a receiver in a communication system implements coherent channel estimation by first receiving an encoded signal and then generating a complex channel estimate from the encoded signal. The receiver then combines the complex channel estimate with the encoded signal to produce a coherent demodulated signal. After combining, the receiver decodes a version of the coherent demodulated signal to produce an estimate of the encoded signal prior to encoding.

    Abstract translation: 通常，通信系统中的接收机通过首先接收编码信号然后从编码信号产生复数信道估计来实现相干信道估计。 然后，接收机将复杂信道估计与编码信号组合以产生相干解调信号。 在组合之后，接收机对相干解调信号的版本进行解码，以在编码之前产生编码信号的估计。

    Method and apparatus for offset frequency estimation for a coherent receiver
    83.
    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

    Applicant: Eugene J. Bruckert ,  Fuyun Ling ,  Thomas A. Sexton

    Inventor： Eugene J. Bruckert ,  Fuyun Ling ,  Thomas A. Sexton

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

    CPC classification number: H04B1/7087 ,  H04B1/707 ,  H04B1/709 ,  H04L27/2332 ,  H04L2027/003 ,  H04L2027/0046 ,  H04L2027/0065 ,  H04L2027/0079

    Abstract: 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.

    Abstract translation: 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 power estimation in an orthogonal coded communication system
    84.
    发明授权
    Method and apparatus for power estimation in an orthogonal coded communication system 失效
    正交编码通信系统中功率估计的方法和装置

    公开(公告)号：US5297161A

    公开(公告)日：1994-03-22

    申请号：US906321

    申请日：1992-06-29

    Applicant: Fuyun Ling

    Inventor： Fuyun Ling

    IPC: H04B1/707 ,  H04B7/005 ,  H04B7/26 ,  H04J11/00 ,  H04J13/00 ,  H04B7/216

    CPC classification number: H04W52/228 ,  H04B1/707 ,  H04J13/004 ,  H04W52/225

    Abstract: A method and apparatus is provided for estimating signal power. The estimating is accomplished by correlating (206) an input data vector (204) with a set of mutually orthogonal codes to generate a set of output values. The input data vector (204) consists of data samples of a received orthogonal coded signal (202). Each output value corresponds to a measure of confidence that the input data vector is substantially similar to one of the orthogonal codes from within the set of mutually orthogonal codes. Finally, an estimate of the power of the received orthogonal coded signal is generated (208) as a nonlinear function of the set output values.

    Abstract translation: 提供了一种用于估计信号功率的方法和装置。 通过将输入数据向量（204）与一组相互正交的代码相关（206）来生成一组输出值来实现估计。 输入数据矢量（204）由接收到的正交编码信号（202）的数据样本组成。 每个输出值对应于输入数据向量与互相正交码集合内的正交码之一基本相似的置信度度量。 最后，生成接收的正交编码信号的功率的估计（208）作为设定的输出值的非线性函数。

    Method and apparatus for adjusting a power control threshold in a communication system
    85.
    发明授权
    Method and apparatus for adjusting a power control threshold in a communication system 失效
    用于在通信系统中调整功率控制阈值的方法和装置

    公开(公告)号：US5216692A

    公开(公告)日：1993-06-01

    申请号：US860878

    申请日：1992-03-31

    Applicant: Fuyun Ling

    Inventor： Fuyun Ling

    IPC: H04J13/00 ,  H04B7/005

    CPC classification number: H04W52/12 ,  H04W52/08 ,  H04W52/225 ,  H04W52/36

    Abstract: A method and apparatus is provided for maintaining received signal power levels at an average level when a signal power estimate is on average similar to the average of actually received signal power levels. The maintaining of the received signal power levels is accomplished by generating an estimate of the power of a received signal. Subsequently, a difference signal is generated by subtracting the estimated received signal power from a predetermined reference signal power. Finally, a signal power control threshold is adjusted as a function of the difference signal.

    Abstract translation: 提供了一种方法和装置，用于当信号功率估计平均类似于实际接收的信号功率电平的平均值时，将接收信号功率电平维持在平均电平。 接收信号功率电平的维持是通过产生对接收信号的功率的估计来实现的。 随后，通过从预定的参考信号功率减去估计的接收信号功率来产生差分信号。 最后，根据差分信号调整信号功率控制阈值。

    Fast training echo canceller
    86.
    发明授权
    Fast training echo canceller 失效
    快速训练回波消除器

    公开(公告)号：US4987569A

    公开(公告)日：1991-01-22

    申请号：US333992

    申请日：1989-04-05

    Applicant: Fuyun Ling ,  Guozhu Long

    Inventor： Fuyun Ling ,  Guozhu Long

    IPC: G06F17/10 ,  H04B3/23

    CPC classification number: H04B3/237 ,  H04B3/238

    Abstract: An echo cancellation modem having a fast training echo canceller in which the echo cancellation coefficients are computed by taking correlations between a complex, periodic training signal sequence and a real component of the corresponding echo signal. The modem includes a receiver circuit for detecting a signal on a channel possibly including an echo; an echo canceller for estimating the real component of the echo signal; training circuitry for applying the complex training sequence to the channel and for taking correlations between the training sequence and the real component of the corresponding echo signal. The modem also includes a computational element for computing the period of the periodic sequence, generating the complex periodic train sequence in real time and for computing a phase roll frequency based upon the computed echo cancellation coefficients.

    Position location using transmitters with timing offset and phase adjustment
    89.
    发明授权
    Position location using transmitters with timing offset and phase adjustment 有权
    使用定时偏移和相位调整的发射机定位位置

    公开(公告)号：US08981996B2

    公开(公告)日：2015-03-17

    申请号：US11327535

    申请日：2006-01-05

    Applicant: Fuyun Ling ,  Gordon Kent Walker ,  Krishna Kiran Mukkavilli

    Inventor： Fuyun Ling ,  Gordon Kent Walker ,  Krishna Kiran Mukkavilli

    IPC: G01S5/02 ,  G01S5/10 ,  G01S5/14

    CPC classification number: G01S5/021 ,  G01S5/0226 ,  G01S5/10 ,  G01S5/14

    Abstract: Systems and methods are provided for determining position location information in a wireless network. In one embodiment, timing offset information is communicated between multiple transmitters and one or more receivers. Such information enables accurate position or location determinations to be made that account for timing differences throughout the network. In another embodiment, transmitter phase adjustments are made that advance or delay transmissions from the transmitters to account for potential timing differences at receivers. In yet another embodiment, combinations of timing offset communications and/or transmitter phase adjustments can be employed in the wireless network to facilitate position location determinations.

    Abstract translation: 提供了用于确定无线网络中的位置信息的系统和方法。 在一个实施例中，在多个发射机和一个或多个接收机之间传送定时偏移信息。 这样的信息使得可以进行精确的位置或位置确定，从而考虑整个网络的时序差异。 在另一个实施例中，进行发射机相位调整，其推进或延迟来自发射机的传输以考虑接收机处的潜在时序差异。 在另一个实施例中，可以在无线网络中采用定时偏移通信和/或发射机相位调整的组合以便于位置定位确定。

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