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11. 发明授权

US06243561B1 Offline page monitoring 有权
标题翻译：离线页面监控
公开(公告)号：US06243561B1
公开(公告)日：2001-06-05
申请号：US09172068
申请日：1998-10-13
申请人： Brian K. Butler , Haitao Zhang , Edward G. Tiedemann, Jr. , Qiuzhen Zou , Gilbert C. Sih , Avneesh Agrawal
发明人： Brian K. Butler , Haitao Zhang , Edward G. Tiedemann, Jr. , Qiuzhen Zou , Gilbert C. Sih , Avneesh Agrawal
IPC分类号： H04L2706
CPC分类号： H04B1/70751 , H04B1/7077 , H04B1/70775 , H04B1/7115 , H04B2201/70701 , H04B2201/70702 , H04W52/0229 , Y02D70/40
摘要： A novel and improved method for performing paging is described. In one embodiment of the invention a searcher is used to detect spread spectrum signals. Samples received RF signals are stored in a sample buffer. During standby mode, the samples are gathered during paging slots assigned to the mobile. A set of searches are performed on the samples, and if pilot signals are detected additional demodulation is performed to detect paging messages. The resulting set of demodulation data may be combined to increase detection. After a page message has been detected, additional demodulation resources may be activated to processes more complete page messages, or other information channels. In one embodiment of the invention, the searcher includes a demodulator to perform quick page detection without the use of finger elements to reduce idle mode power consumption.
摘要翻译：描述了一种用于执行寻呼的新颖和改进的方法。在本发明的一个实施例中，搜索器用于检测扩频信号。样本接收的RF信号被存储在样本缓冲器中。在待机模式期间，在分配给移动台的寻呼时隙期间收集采样。对样本执行一组搜索，并且如果检测到导频信号，则执行附加解调以检测寻呼消息。可以组合所得到的解调数据集以增加检测。在检测到页面消息之后，可以激活附加解调资源以处理更完整的页面消息或其他信息信道。在本发明的一个实施例中，搜索器包括一个解调器，用于执行快速页面检测，而无需使用手指元件来减少空闲模式功耗。

12. 发明授权

US06154101A Fast slewing pseudorandom noise sequence generator 有权
标题翻译：快速回转伪随机噪声序列发生器
公开(公告)号：US06154101A
公开(公告)日：2000-11-28
申请号：US198079
申请日：1998-11-23
申请人： Qiuzhen Zou , Gilbert C. Sih , Avneesh Agrawal
发明人： Qiuzhen Zou , Gilbert C. Sih , Avneesh Agrawal
IPC分类号： G06F7/58 , H03K3/84 , H04B7/26 , H04J13/00 , H04J13/10 , H03B29/00
CPC分类号： H04J13/0022 , G06F7/582 , H04J13/10
摘要： A novel and improved method and apparatus for a fast-slewing pseudorandom noise sequence generator is described. One or more loadable PN generators are controlled by a DSP or microprocessor in conjunction with a free-running counter which maintains a reference offset count. The PN generator will typically be part of a finger or searcher. The DSP or microprocessor may assist in other finger or searcher functions as well as the slew function, and can control one or more fingers and/or searchers. Each PN generator is comprised of a loadable linear feedback shift register (LFSR) or its equivalent, a loadable counter for maintaining an index of the state of that particular PN generator, and a slew control device capable of receiving a slew command and controlling the LFSR and index counter to enact an advance or a retard of a certain offset distance.
摘要翻译：描述了一种用于快速回转伪随机噪声序列发生器的新颖和改进的方法和装置。一个或多个可加载的PN发生器由DSP或微处理器与自由运行的计数器结合来维持参考偏移计数来控制。 PN发生器通常是手指或搜索器的一部分。 DSP或微处理器可以协助其他手指或搜索器功能以及转换功能，并且可以控制一个或多个手指和/或搜索器。每个PN发生器由可装载的线性反馈移位寄存器（LFSR）或其等效物组成，用于维持该特定PN发生器的状态的索引的可装载计数器以及能够接收转换命令并控制LFSR的转换控制装置和索引计数器来产生某个偏移距离的提前或延迟。

13. 发明授权

US5892816A Method and apparatus for detecting facsimile transmission 失效
标题翻译：用于检测传真传输的方法和装置
公开(公告)号：US5892816A
公开(公告)日：1999-04-06
申请号：US751190
申请日：1996-11-15
申请人： Gilbert C. Sih , Johnny K. John
发明人： Gilbert C. Sih , Johnny K. John
IPC分类号： H04N1/32 , H04M1/725 , H04M11/00 , H04N1/327
CPC分类号： H04N1/32708 , H04M1/725 , H04N1/32704 , H04N1/32715 , H04N1/32721
摘要： A novel and improved method and apparatus for providing an interface to a digital wireless telephone system compatible with standard analog wire line telephones and analog wire line fax machines is disclosed. During a telephone call, a fax detector monitors the incoming data for fax signals. If a fax is detected, the data processor switches from processing the data as if it were voice to processing it as fax. In addition, the remote station is sent a signal notifying it to process the data as fax rather than voice. The fax detector operates by detecting the preamble of a V.21 message, present at the beginning of every fax call. Energy is measured in both frequencies of the BFSK signals. A decision is made by analyzing these energies and locating a specific pattern which repeats itself a sufficient number of times.
摘要翻译：公开了一种用于向与标准模拟有线电话和模拟有线线路传真机兼容的数字无线电话系统提供接口的新型改进的方法和装置。在电话呼叫期间，传真机检测器监视传入信号的传入数据。如果检测到传真，则数据处理器从数据处理器转换为像语音一样将其作为传真处理。另外，远程站发送一个信号通知它将数据作为传真而不是语音处理。传真检测器通过检测在每个传真呼叫开始时出现的V.21消息的前导码来进行操作。在BFSK信号的两个频率上测量能量。通过分析这些能量并找到重复自身足够次数的特定模式来做出决定。

14. 发明授权

US5675644A Method and apparatus for canceling echo accounting for delay variations 失效
标题翻译：消除延迟变化回波的方法和装置
公开(公告)号：US5675644A
公开(公告)日：1997-10-07
申请号：US533883
申请日：1995-09-26
申请人： Gilbert C. Sih
发明人： Gilbert C. Sih
IPC分类号： H04B3/23 , H04B3/20 , H04M9/00
CPC分类号： H04B3/23
摘要： A method and apparatus for detecting and correcting for variations in the flat delay, which permits smooth echo canceller operation even under dynamic delay conditions. In a delay monitor, the received signal is compared against delayed versions of the echo estimate to determine whether a shift in the echo delay has occurred. If such a shift in delay has occurred then a signal indicating the amount of the shift is to the adaptive filter of the echo canceller and the filter taps are updated in accordance with the delay shift value.
摘要翻译：一种用于检测和校正平坦延迟变化的方法和装置，即使在动态延迟条件下也允许平滑的回波消除器操作。在延迟监视器中，将接收的信号与回波估计的延迟版本进行比较，以确定是否发生了回波延迟的移位。如果发生这种延迟移位，则表示移位量的信号是回波消除器的自适应滤波器，并且根据延迟移位值更新滤波器抽头。

15. 发明授权

US5592548A System and method for avoiding false convergence in the presence of tones in a time-domain echo cancellation process 失效
标题翻译：用于在时域回声消除过程中存在音调的情况下避免误会的系统和方法
公开(公告)号：US5592548A
公开(公告)日：1997-01-07
申请号：US455801
申请日：1995-05-31
申请人： Gilbert C. Sih
发明人： Gilbert C. Sih
IPC分类号： H03H21/00 , H04B3/23 , H04M1/00 , H04Q3/42 , H04M9/08
CPC分类号： H04B3/23
摘要： A system and method for detecting convergence in an echo canceller prevent false convergence from occurring as a result of receiving only tones in an input signal. An adaptive filter is used in an echo canceller to estimate an echo signal produced by an unknown echo channel. The estimated echo signal is subtracted from the return signal to remove the echo produced by the unknown echo channel. To prevent the echo canceller from falsely converging on a signal which contains only tones a system and method are provided for detecting the presence of tones in the absence of other frequencies. Filter taps of the adaptive filter are filtered to produce a filtered signal. The amount of energy in the filtered signal is compared to the amount of energy in the unfiltered filter taps to determine whether only tones have been present. If only tones have been present, the echo canceller is not allowed to reduce the adaptation step size of the adaptive filter.
摘要翻译：用于检测回波消除器中的收敛的系统和方法防止作为仅在输入信号中接收音调的结果而发生错误收敛。在回波消除器中使用自适应滤波器来估计由未知回波信道产生的回波信号。从返回信号中减去估计的回波信号，以去除由未知回波通道产生的回波。为了防止回波消除器错误地聚合在仅包含音调的信号上，提供了系统和方法，用于在没有其它频率的情况下检测音调的存在。对自适应滤波器的滤波器滤波器进行滤波以产生滤波信号。将经滤波的信号中的能量与未过滤的滤波器抽头中的能量的量进行比较，以确定是否仅存在音调。如果仅存在音调，则不允许回波消除器减小自适应滤波器的自适应步长。

16. 发明授权

US06704555B2 Apparatus and method for calibrating local oscillation frequency in wireless communications 有权
标题翻译：无线通信校准本地振荡频率的装置和方法
公开(公告)号：US06704555B2
公开(公告)日：2004-03-09
申请号：US09804707
申请日：2001-03-12
申请人： Gilbert C. Sih , Raghu Challa
发明人： Gilbert C. Sih , Raghu Challa
IPC分类号： H04B106
CPC分类号： H04L27/0014 , H04L2027/0016 , H04L2027/0057 , H04L2027/0087
摘要： According to a disclosed embodiment, a receiver comprising a digital rotator in combination with a frequency error discriminator in a digital automatic frequency control loop is used to arrive at accurate digital values used to calibrate a local oscillation frequency. A frequency error in the oscillation frequency of a local frequency generation loop causes a change in the baseband input signal frequency. The change in the baseband input signal frequency related to the frequency error in the local frequency generation loop can be detected as a phase rotation by the frequency error discriminator. By using the digital automatic frequency control loop, the frequency error introduced by the local frequency generation is determined with accuracy. The frequency error and corresponding control bits are entered into a calibration table. The calibration table may be used to adjust the local oscillation frequency for temperature changes, pilot frequency searching, and quick paging.
摘要翻译：根据所公开的实施例，使用包括与数字自动频率控制环路中的频率误差鉴别器结合的数字旋转器的接收器来获得用于校准本地振荡频率的精确数字值。本地频率产生环路的振荡频率的频率误差导致基带输入信号频率的变化。与本地频率产生回路中的频率误差相关的基带输入信号频率的变化可以被频率误差鉴别器检测为相位旋转。通过使用数字自动频率控制回路，准确地确定由本地频率产生引入的频率误差。将频率误差和相应的控制位输入校准表。校准表可用于调整温度变化，导频搜索和快速寻呼的本地振荡频率。

17. 发明授权

US06608858B1 Multipath doppler adjusted frequency tracking loop 有权
标题翻译：多径多普勒调整频率跟踪回路
公开(公告)号：US06608858B1
公开(公告)日：2003-08-19
申请号：US09491349
申请日：2000-01-26
申请人： Gilbert C. Sih , Avneesh Agrawal , Mark Roh , Brian K. Butler , Raghu Challa
发明人： Gilbert C. Sih , Avneesh Agrawal , Mark Roh , Brian K. Butler , Raghu Challa
IPC分类号： H04B1707
CPC分类号： H04B1/7087 , H04B1/7115 , H04B1/7117 , H04B2201/70701 , H04L27/0014 , H04L2027/0032 , H04L2027/0057 , H04L2027/0087
摘要： A method and apparatus for frequency tracking is described. The present invention provides a tracking mechanism for removing the effects of error due to frequency offset as well as compensation for frequency error due to doppler in a plurality of multipath signals. Each finger of a RAKE receiver utilizing the present invention will compute a frequency error for that finger. The weighted average of all of these frequency errors is calculated and filtered to provide a control signal for varying the frequency of IF and RF frequency synthesizers, accounting for the common frequency offset seen at each finger. Additionally, each finger is equipped with a rotator for providing frequency adjustment specific to that finger. The frequency of each finger is adjusted through feedback of the frequency error for that finger.
摘要翻译：描述了用于频率跟踪的方法和装置。本发明提供了一种用于消除由于频率偏移引起的误差的影响的跟踪机制以及由多个多径信号中的多普勒引起的频率误差的补偿。利用本发明的RAKE接收机的每个手指将计算该手指的频率误差。计算并滤波所有这些频率误差的加权平均值，以提供用于改变IF和RF频率合成器的频率的控制信号，从而考虑每个手指处的共同频率偏移。此外，每个手指配备有用于提供特定于该手指的频率调节的旋转器。每个手指的频率通过该手指的频率误差的反馈进行调整。

18. 发明授权

US06557022B1 Digital signal processor with coupled multiply-accumulate units 有权
标题翻译：具有耦合乘法单元的数字信号处理器
公开(公告)号：US06557022B1
公开(公告)日：2003-04-29
申请号：US09513980
申请日：2000-02-26
申请人： Gilbert C. Sih , Xufeng Chen , De D. Hsu
发明人： Gilbert C. Sih , Xufeng Chen , De D. Hsu
IPC分类号： G06F738
CPC分类号： G06F7/5443
摘要： Two multiply-accumulate units are coupled together so that the computation (B*C)+(D*E) can be completed in one cycle. An adder (216) adds together the products of the two multipliers (206), (208). The sum is applied to the first accumulator (220). Preferably, the second product is also applied to the second accumulator (222), and a multiplexer (218) applies either a zero or the second product to the adder (216). If two unrelated computations are to be executed simultaneously, then the zero is applied, and the output of the second accumulator is fed back to the register file (PI2). If a single (B*C)+(D*E) computation is to be executed, then the second product is applied to the adder, and the output of the second accumulator is disregarded.
摘要翻译：两个乘法累加单元耦合在一起，使得计算（B * C）+（D * E）可以在一个周期内完成。加法器（216）将两个乘法器（206），（208）的乘积相加。该和被施加到第一累加器（220）。优选地，第二乘积也被施加到第二累加器（222），并且多路复用器（218）将零或第二乘积应用于加法器（216）。如果要同时执行两个不相关的计算，则应用零，并将第二个累加器的输出反馈到寄存器文件（PI2）。如果要执行单个（B * C）+（D * E）计算，则第二乘积被施加到加法器，并且忽略第二累加器的输出。

19. 发明授权

US06323805B1 Data boundary aware base station assisted position location 有权
标题翻译：数据边界感知基站辅助位置定位
公开(公告)号：US06323805B1
公开(公告)日：2001-11-27
申请号：US09150410
申请日：1998-09-09
申请人： Qiuzhen Zou , Gilbert C. Sih , Inyup Kang
发明人： Qiuzhen Zou , Gilbert C. Sih , Inyup Kang
IPC分类号： G01S514
CPC分类号： G01S5/0036 , G01S19/235 , G01S19/254 , G01S19/258 , G01S19/30
摘要： The present invention is a novel and improved method and apparatus for performing position location in wireless communications system. One embodiment of the invention comprises a method for performing position location on a subscriber unit in a terrestrial wireless telephone system using a set of satellites each transmitting a signal, the terrestrial wireless telephone system having base stations, including the steps of transmitting an aiding message from the base station to the subscriber unit, said aiding message containing information regarding a data boundary for each signal from the set of satellites, applying correlation codes to each signal yielding corresponding correlation data and accumulating said correlation data over an first interval preceding a corresponding data boundary yielding a first accumulation result, and a second interval following said corresponding data boundary yielding a second accumulation result.
摘要翻译：本发明是一种用于在无线通信系统中执行位置定位的新颖且改进的方法和装置。本发明的一个实施例包括一种用于在陆地无线电话系统中的用户单元上执行位置定位的方法，该方法使用一组发射信号的卫星，具有基站的地面无线电话系统包括以下步骤：从基站到用户单元，所述辅助消息包含关于来自卫星组的每个信号的数据边界的信息，将相关代码应用于产生相应相关数据的每个信号，并在对应的数据边界之前的第一间隔上累加所述相关数据产生第一累积结果，并且在所述对应数据边界之后的第二间隔产生第二累积结果。

20. 发明授权

US06278775B1 Method and apparatus for detecting facsimile transmission 有权
标题翻译：用于检测传真传输的方法和装置
公开(公告)号：US06278775B1
公开(公告)日：2001-08-21
申请号：US09266521
申请日：1999-03-11
申请人： Gilbert C. Sih , Johnny K. John
发明人： Gilbert C. Sih , Johnny K. John
IPC分类号： H04M1100
CPC分类号： H04N1/32708 , H04M1/725 , H04N1/32704 , H04N1/32715 , H04N1/32721
摘要： A novel and improved method and apparatus for providing an interface to a digital wireless telephone system compatible with standard analog wire line telephones and analog wire line fax machines is disclosed. During a telephone call, a fax detector monitors the incoming data for fax signals. If a fax is detected, the data processor switches from processing the data as if it were voice to processing it as fax In addition, the remote station is sent a signal notifying it to process the data as fax rather than voice. The fax detector operates by detecting the preamble of a V.21 message, present at the beginning of every fax call. Energy is measured in both frequencies of the BFSK signals. A decision is made by analyzing these energies and locating a specific pattern which repeats itself a sufficient number of times.
摘要翻译：公开了一种用于向与标准模拟有线电话和模拟有线线路传真机兼容的数字无线电话系统提供接口的新型改进的方法和装置。在电话呼叫期间，传真机检测器监视传入信号的传入数据。如果检测到传真，则数据处理器将处理数据转换为处理数据，就像将其作为传真处理一样。此外，远程站发送一个信号，通知它将数据作为传真处理，而不是语音。传真检测器通过检测在每个传真呼叫开始时出现的V.21消息的前导码来进行操作。在BFSK信号的两个频率上测量能量。通过分析这些能量并找到重复自身足够次数的特定模式来做出决定。

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