公开(公告)号：US07586382B2

公开(公告)日：2009-09-08

申请号：US11681568

申请日：2007-03-02

申请人： Chi-Shin Wang ,  Zhike Jia ,  Lianxue Xiong ,  Yinghao Tu

发明人： Chi-Shin Wang ,  Zhike Jia ,  Lianxue Xiong ,  Yinghao Tu

IPC分类号： G01C21/00 ,  H03L1/00

CPC分类号： G01S19/235 ,  H03J7/04 ,  H03L1/02

摘要： Systems and methods are provided that compensate for frequency drift due to temperature variation without the need for a temperature sensor. In one embodiment, a navigation receiver with an integrated communication device receives a base station reference signal, which is used to periodically calibrate a local oscillator frequency. In another embodiment, the calibrated local oscillator frequency drives a counter that is used to provide code phase estimation at the start of satellite signal acquisition. To provide temperature compensation in one embodiment, the calibrated local frequency is used to drive one or more counters at different calibration rates (i.e., different time intervals between calibrations). Count values from these counters are used to determine compensation for frequency drift due to temperature variation based on predicted frequency drift variation patterns between calibrations. This temperature compensation does not require a temperature sensor and further improves the accuracy of the code phase estimation.

摘要翻译： 提供了系统和方法，其补偿由于温度变化而引起的频率漂移，而不需要温度传感器。 在一个实施例中，具有集成通信设备的导航接收器接收用于周期性地校准本地振荡器频率的基站参考信号。 在另一个实施例中，校准的本地振荡器频率驱动用于在卫星信号采集开始时提供码相位估计的计数器。 为了在一个实施例中提供温度补偿，校准的本地频率用于以不同的校准速率驱动一个或多个计数器（即校准之间的不同时间间隔）。 这些计数器的计数值用于根据校准之间的预测频率漂移变化模式来确定由于温度变化引起的频率漂移的补偿。 该温度补偿不需要温度传感器，进一步提高了代码相位估计的精度。

公开(公告)号：US07474718B2

公开(公告)日：2009-01-06

申请号：US10748598

申请日：2003-12-30

申请人： Hong Liu

发明人： Hong Liu

IPC分类号： H04L27/06

CPC分类号： H03J7/04 ,  H03J2200/02 ,  H04L27/22 ,  H04L2027/0032 ,  H04L2027/0055 ,  H04L2027/0065 ,  H04L2027/0095

摘要： A mobile station in a TDMA network can perform automatic frequency using burst in all or any slot in a control channel. This is achieved by identifying the training sequence of an arbitrary set of or all received bursts.

摘要翻译： TDMA网络中的移动台可以在控制信道中的全部或任何时隙中执行使用突发的自动频率。 这通过识别任意一组或所有接收的脉冲串的训练序列来实现。

公开(公告)号：US20080267319A1

公开(公告)日：2008-10-30

申请号：US12168084

申请日：2008-07-04

申请人： ZHONGMING SHI ,  AHMADREZA (REZA) ROFOUGARAN ,  ARYA REZA BEHZAD

发明人： ZHONGMING SHI ,  AHMADREZA (REZA) ROFOUGARAN ,  ARYA REZA BEHZAD

IPC分类号： H03K9/00 ,  H04L27/16

CPC分类号： H03G3/3042 ,  H03J7/04 ,  H04B1/04 ,  H04B1/30 ,  H04B1/408 ,  H04B2001/0416

摘要： A single chip radio transceiver includes circuitry that enables received wideband RF signals to be down converted to base band frequencies and base band signals to be up converted to wideband RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a low noise amplifier, automatic frequency control circuitry for aligning the LO frequency with the frequency of the received RF signals, signal power measuring circuitry for measuring the signal to signal and power ratio and for adjusting frontal and rear amplification stages accordingly, and finally, filtering circuitry to filter high and low frequency interfering signals including DC offset.

摘要翻译： 单芯片无线电收发机包括使接收的宽带RF信号下变频到基带频率和基带信号在传输之前被上转换成宽带RF信号的电路，而不需要转换到中频。 该电路包括一个低噪声放大器，自动频率控制电路，用于将LO频率与接收到的RF信号的频率对准，信号功率测量电路，用于测量信号与信号和功率比，并相应地调整正面和后置放大级;以及 最后，滤波电路对高频和低频干扰信号进行滤波，包括直流偏移。

公开(公告)号：US20080253486A1

公开(公告)日：2008-10-16

申请号：US12101624

申请日：2008-04-11

申请人： YASUSHI MARUTA

发明人： YASUSHI MARUTA

IPC分类号： H04L27/14

CPC分类号： H03J7/04 ,  H04L7/02 ,  H04L7/042

摘要： A frequency correction circuit that gives plural frequency offsets to a received radio signal in order to correct a frequency error of the radio signal, demodulates the radio signal, combines an arbitrary number of demodulation signals as combined demodulation signals from among plural demodulation signals, and selects one demodulation signal or combined demodulation signal from among the demodulation signals and the combined demodulation signals.

摘要翻译： 频率校正电路，对接收到的无线信号进行多个频率偏移，以校正无线信号的频率误差，对无线电信号进行解调，将任意数量的解调信号作为来自多个解调信号的组合解调信号进行合成，并选择 一个解调信号或来自解调信号和组合解调信号的组合解调信号。

公开(公告)号：US07299024B2

公开(公告)日：2007-11-20

申请号：US10718821

申请日：2003-11-21

申请人： L. Scott Bloebaum ,  Piyush Bharti ,  Sherk Chung ,  Benjamin Van Roy ,  Wallace Mann

发明人： L. Scott Bloebaum ,  Piyush Bharti ,  Sherk Chung ,  Benjamin Van Roy ,  Wallace Mann

IPC分类号： H04B1/06

CPC分类号： G01S19/29 ,  G01S19/235 ,  G01S19/37 ,  H03J1/0008 ,  H03J7/04 ,  H04B1/3805

摘要： In a mobile communication device, a method for compensating for a frequency adjustment in an oscillator shared between a communication circuit and a positioning signal receiver is provided. In one embodiment, a method for determining the operating frequency of an oscillator detects a beginning time point of a reference signal received by the mobile communication device and enables a counter to count in step with a clock signal derived from the oscillator. When an ending time point of the reference signal is received by the mobile communication device, the count is stopped, and the frequency of the oscillator is determined based on the count in the counter and an expected time that elapsed between the beginning time point and the ending time point.

摘要翻译： 在移动通信装置中，提供了用于补偿在通信电路和定位信号接收器之间共享的振荡器中的频率调整的方法。 在一个实施例中，用于确定振荡器的工作频率的方法检测由移动通信设备接收到的参考信号的开始时间点，并使计数器能够与从振荡器导出的时钟信号同步进行计数。 当移动通信装置接收到参考信号的结束时间点时，停止计数，并且基于计数器中的计数和从开始时间点和开始时间之间经过的预期时间来确定振荡器的频率 结束时间点。

公开(公告)号：US07299023B2

公开(公告)日：2007-11-20

申请号：US11382380

申请日：2006-05-09

申请人： Donald M. Grieco ,  Aykut Bultan

发明人： Donald M. Grieco ,  Aykut Bultan

IPC分类号： H04B7/00

CPC分类号： H03J7/02 ,  H03J7/04 ,  H03J2200/02

摘要： The present invention is related to a method and apparatus for automatic frequency correction of a local oscillator. The apparatus receives a carrier signal. The carrier signal includes a code sequence known to the apparatus. The apparatus downconverts the carrier signal to a baseband signal using the local oscillator. The apparatus performs a block correlation of the samples of the baseband signal with the known code sequence to generate a frequency error signal. The frequency error signal is fed back to the local oscillator to correct the frequency error.

摘要翻译： 本发明涉及本地振荡器的自动频率校正的方法和装置。 该装置接收载波信号。 载波信号包括该装置已知的码序列。 该装置使用本地振荡器将载波信号下变频为基带信号。 该装置执行基带信号的样本与已知码序列的块相关，以产生频率误差信号。 频率误差信号反馈给本地振荡器以校正频率误差。

公开(公告)号：US20070165703A1

公开(公告)日：2007-07-19

申请号：US10590558

申请日：2004-03-08

申请人： Wen Gao ,  Zoran Kostic ,  Alton Keel

发明人： Wen Gao ,  Zoran Kostic ,  Alton Keel

IPC分类号： H04B1/00

CPC分类号： H03J7/04 ,  H03J2200/02 ,  H04L27/0014 ,  H04L2027/0055

摘要： There is provided a method for generating an error signal for an automatic frequency control (AFC) loop in a Code Division Multiple Access (CDMA) system. Sign information relating to phase differences in received pilot signals is accumulated. In one embodiment, the accumulated sign information is compared against predetermined threshold levels. The error signal is generated when at least one of the predetermined threshold levels is satisfied. In a second embodiment, the accumulated sign information is decimated. An output of the decimating step is utilized as the error signal for the AFC loop.

摘要翻译： 提供了一种用于在码分多址（CDMA）系统中为自动频率控制（AFC）环路产生误差信号的方法。 累积与接收到的导频信号中的相位差有关的符号信息。 在一个实施例中，将累积的符号信息与预定阈值水平进行比较。 当满足预定阈值水平中的至少一个时产生误差信号。 在第二实施例中，累积的符号信息被抽取。 抽取步骤的输出被用作AFC循环的误差信号。

公开(公告)号：US07224722B2

公开(公告)日：2007-05-29

申请号：US10255378

申请日：2002-09-26

申请人： Zhongming Shi ,  Ahmadreza Rofougaran ,  Arya Reza Behzad

发明人： Zhongming Shi ,  Ahmadreza Rofougaran ,  Arya Reza Behzad

IPC分类号： H04B1/38 ,  H04L5/16

CPC分类号： H03G3/3042 ,  H03J7/04 ,  H04B1/04 ,  H04B1/30 ,  H04B1/408 ,  H04B2001/0416

摘要： A single chip radio transceiver includes circuitry that enables received wideband RF signals to be down-converted to baseband frequencies and baseband signals to be up-converted to wideband RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a low noise amplifier, automatic frequency control circuitry for aligning a local oscillation frequency with the frequency of the received RF signals, signal power measuring circuitry for measuring the signal to signal and power ratio and for adjusting frontal and rear amplification stages accordingly, and finally, filtering circuitry to filter high and low frequency interfering signals including DC offset.

摘要翻译： 单芯片无线电收发器包括使接收的宽带RF信号下变频到基带频率的电路，并且基带信号在传输之前被上变频到宽带RF信号，而不需要转换到中频。 该电路包括一个低噪声放大器，用于使本地振荡频率与接收到的RF信号的频率对准的自动频率控制电路，用于测量信号与信号和功率比的信号功率测量电路，以及相应地调整正面和后置放大级， 最后，滤波电路来滤除高频和低频干扰信号，包括直流偏移。

公开(公告)号：US20070032213A1

公开(公告)日：2007-02-08

申请号：US11382380

申请日：2006-05-09

申请人： Donald Grieco ,  Aykut Bultan

发明人： Donald Grieco ,  Aykut Bultan

IPC分类号： H04B1/06 ,  H04B7/00

CPC分类号： H03J7/02 ,  H03J7/04 ,  H03J2200/02

摘要： The present invention is related to a method and apparatus for automatic frequency correction of a local oscillator. The apparatus receives a carrier signal. The carrier signal includes a code sequence known to the apparatus. The apparatus downconverts the carrier signal to a baseband signal using the local oscillator. The apparatus performs a block correlation of the samples of the baseband signal with the known code sequence to generate a frequency error signal. The frequency error signal is fed back to the local oscillator to correct the frequency error.

摘要翻译： 本发明涉及本地振荡器的自动频率校正的方法和装置。 该装置接收载波信号。 载波信号包括该装置已知的码序列。 该装置使用本地振荡器将载波信号下变频为基带信号。 该装置执行基带信号的样本与已知码序列的块相关，以产生频率误差信号。 频率误差信号反馈给本地振荡器以校正频率误差。

公开(公告)号：US20060276223A1

公开(公告)日：2006-12-07

申请号：US11504853

申请日：2006-08-16

申请人： Charles Abraham

发明人： Charles Abraham

IPC分类号： H04M1/00

CPC分类号： H04B1/403 ,  G01S19/235 ,  H03J7/04 ,  H03J2200/11 ,  H04B1/3805

摘要： A method and apparatus for using a conventional oscillator in a cellular telephone transceiver as a source of a reference signal for a GPS receiver. In one embodiment, the method comprises using a voltage-controlled oscillator (“VCXO”) within a cellular telephone transceiver to generate a reference frequency signal for the GPS receiver. Circuitry within the telephone transceiver generates a frequency error signal. Both of these signals are coupled to GPS circuitry and used to control a carrier numerically controlled oscillator (“NCO”) and a code NCO. The NCOs produce a tuning signal and a timing signal, respectively. The GPS circuitry uses the NCO generated signals to process GPS signals.

摘要翻译： 一种在蜂窝电话收发机中使用常规振荡器作为GPS接收机的参考信号源的方法和装置。 在一个实施例中，该方法包括在蜂窝电话收发器内使用压控振荡器（“VCXO”）来产生用于GPS接收器的参考频率信号。 电话收发器内的电路产生频率误差信号。 这两个信号耦合到GPS电路并用于控制载波数控振荡器（“NCO”）和代码NCO。 NCO分别产生调谐信号和定时信号。 GPS电路使用NCO生成的信号来处理GPS信号。