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11. 发明授权

US06891908B2 Portable radio system and portable radio equipment to be used in the same and frequency error prediction method used therefor 有权
标题翻译：便携式无线电系统和便携式无线电设备将用于与之相同的频率误差预测方法
公开(公告)号：US06891908B2
公开(公告)日：2005-05-10
申请号：US09828861
申请日：2001-04-10
申请人： Mariko Matsu Moto , Shigeru Ono
发明人： Mariko Matsu Moto , Shigeru Ono
IPC分类号： H04L27/22 , H03J7/04 , H04L7/02 , H04L27/06 , H04B17/00
CPC分类号： H03J7/04
摘要： A portable radio system, a portable radio equipment to be used in the same and a frequency error prediction method can be adapted to large frequency error by making tap number smaller and frequency error smaller. The portable radio system employs an automatic frequency control for detecting a frequency shift of an internal oscillator of a portable radio equipment with reference to a received wave transmitted from a base station having higher precision of frequency and adjusting the frequency of the internal oscillator by feeding back the frequency shift to the internal oscillator. Coordinate rotation digital computation (CORDIC) is employed for calculation of arctangent in the automatic frequency control.
摘要翻译：便携式无线电系统，要使用的便携式无线电设备和频率误差预测方法可以通过使抽头数较小和频率误差较小而适应于大的频率误差。便携式无线电系统采用自动频率控制，参考从具有较高频率精度的基站发送的接收波来检测便携式无线电设备的内部振荡器的频移，并通过反馈来调整内部振荡器的频率频移到内部振荡器。坐标旋转数字计算（CORDIC）用于计算自动频率控制中的反正切。

12. 发明申请

US20050043825A1 Method and apparatus for a control signal generating circuit 审中-公开
标题翻译：控制信号发生电路的方法和装置
公开(公告)号：US20050043825A1
公开(公告)日：2005-02-24
申请号：US10695917
申请日：2003-10-30
申请人： Chris Aldridge , Yuhong Wang
发明人： Chris Aldridge , Yuhong Wang
IPC分类号： H03J7/04 , H03L7/091 , G05B13/02
CPC分类号： H03J7/04 , H03J2200/02 , H03L7/091
摘要： A control signal generating circuit (460) for an automatic frequency control (AFC) circuit (465), in accordance with the present invention receives a digital timing control signal directly from the output of a digital loop filter (138) of a tracking circuit (430), and produces a frequency control signal that is provided to a VCXO (110). The control signal generating circuit (460) comprises a multiplier (462) and an integrator (466) which are relatively simple to implement, and does not require complex processing, such as determining an inverse tangent as taught by the prior. Consequently, approximation errors associated with inverse tangent processing are avoided.
摘要翻译：根据本发明的用于自动频率控制（AFC）电路（465）的控制信号发生电路（460）直接从跟踪电路的数字环路滤波器（138）的输出接收数字定时控制信号 430），并产生提供给VCXO（110）的频率控制信号。控制信号发生电路（460）包括相对简单的实现的乘法器（462）和积分器（466），并且不需要复杂的处理，例如确定如先前所教导的反正切。因此，避免了与反正切处理相关联的近似误差。

13. 发明授权

US06847811B2 Receiver circuit compensation for filter response error 失效
标题翻译：接收器电路补偿滤波器响应误差
公开(公告)号：US06847811B2
公开(公告)日：2005-01-25
申请号：US09815203
申请日：2001-03-22
申请人： Andreas Hofmann
发明人： Andreas Hofmann
IPC分类号： H03D7/00 , H03D7/16 , H03J3/04 , H03J7/04 , H04B1/04 , H04B1/26
CPC分类号： H03J7/04 , H03J3/04
摘要： A circuit configuration having a filter, for example a bandpass filter, and a method for its operation are specified, which the circuit configuration allows for compensation of a frequency error, for example between an actual mid-frequency and a nominal frequency. A first mixer, upstream of the filter and a second mixer downstream from the filter are provided. A signal and a respective oscillation frequency are each supplied to respective inputs of the first and second mixers. The oscillation frequencies are mixed as a function of the frequency error in frequency generators such that the signal at the intermediate frequency is matched to the filter characteristics of the filter which is subject to tolerances. In consequence, filters that satisfy the stringent requirements for WCDMA mobile radio applications, but by virtue of the manufacturing technique, have an excessive mid-frequency error, can be used, for example, in heterodyne receivers.
摘要翻译：规定具有滤波器（例如带通滤波器）及其操作方法的电路配置，其电路配置允许例如在实际的中频和标称频率之间的频率误差的补偿。提供在过滤器上游的第一混合器和从过滤器下游的第二混合器。信号和各自的振荡频率分别提供给第一和第二混频器的相应输入端。作为频率发生器中的频率误差的函数，振荡频率被混合，使得中频处的信号与经过公差的滤波器的滤波器特性相匹配。因此，可以使用例如在外差接收机中使用满足WCDMA移动无线电应用的严格要求但是由于制造技术而具有过高的中频误差的滤波器。

14. 发明申请

US20050003787A1 Method and device for compensating voltage-controlled crystal oscillator of mobile unit 审中-公开
标题翻译：用于补偿移动单元的压控晶体振荡器的方法和装置
公开(公告)号：US20050003787A1
公开(公告)日：2005-01-06
申请号：US10862852
申请日：2004-06-07
申请人： Liang-Fang Chen
发明人： Liang-Fang Chen
IPC分类号： H03J1/00 , H03J7/04 , H04B7/005 , H04B7/00 , H04B1/18
CPC分类号： H04W52/52 , H03J1/0008 , H03J7/04
摘要： A method for compensating voltage-controlled crystal oscillator of a mobile unit is firstly to define a pre-compensated value according to a voltage drop of an auto frequency control voltage while proceeding signal transmission between the mobile unit and a base station at different power levels so as to get specific pre-compensated values at corresponding power levels. Then, the method proceeds a compensating procedure to the voltage-controlled crystal oscillator with the pre-compensated value while transmitting Tx burst from the mobile unit to the base station so that a frequency of Tx burst can be regulated with respect to a frequency of Rx burst.
摘要翻译：用于补偿移动单元的压控晶体振荡器的方法首先是根据自动频率控制电压的电压降定义预补偿值，同时在不同功率电平下在移动单元和基站之间进行信号传输，以获得相应功率水平的特定预补偿值。然后，该方法在从移动单元向基站发送Tx突发的同时以预先补偿的值对具有预补偿值的压控晶体振荡器进行补偿，从而可以相对于Rx的频率来调整Tx突发的频率爆裂。

15. 发明授权

US6157260A Method and apparatus for calibrating a local oscillator in a direct conversion receiver 有权
公开(公告)号：US6157260A
公开(公告)日：2000-12-05
申请号：US260306
申请日：1999-03-02
申请人： Keith A. Tilley , Rajesh H. Zele , Walter H. Kehler, Jr.
发明人： Keith A. Tilley , Rajesh H. Zele , Walter H. Kehler, Jr.
IPC分类号： H03J7/04 , H03L7/14 , H03L7/00
CPC分类号： H03J7/04 , H03J2200/29 , H03L7/146
摘要： A receiver includes a main loop (222) having a main VCO (210) and a secondary loop (224) having a secondary VCO (216). The receiver momentarily phase locks an incoming RF signal (228), and then samples and stores a correction voltage (240) being applied to the main VCO (210). The main loop (222) is then put into a non-phase locked mode of operation and the stored correction voltage is applied through a receive automatic tuning circuit (218) to the main VCO (210) for the duration of the incoming RF signal (228). This effectively calibrates the LO frequency (230) of the receiver to the incoming RF signal frequency (228).

16. 发明授权

US6111540A Combined GPS positioning system and communications system utilizing shared circuitry 有权
标题翻译：组合GPS定位系统和利用共享电路的通信系统
公开(公告)号：US6111540A
公开(公告)日：2000-08-29
申请号：US343124
申请日：1999-06-29
申请人： Norman F. Krasner
发明人： Norman F. Krasner
IPC分类号： G01S1/00 , G01S5/00 , G01S5/14 , G01S19/09 , G01S19/24 , G01S19/36 , H01Q1/27 , H01Q21/28 , H03D7/16 , H03J7/04 , H03J7/06 , H04B1/00 , H04B1/28 , H04B1/38 , H04B7/185 , G01S5/02
CPC分类号： H04B1/0007 , G01S19/07 , G01S19/09 , G01S19/235 , G01S19/25 , G01S19/29 , G01S19/34 , G01S19/35 , G01S19/37 , G01S5/0036 , G01S5/009 , H01Q1/273 , H01Q21/28 , H03J7/04 , H03J7/06 , H04B1/28 , H04B1/3805 , G01S19/252 , G01S19/254 , G01S19/256 , G01S19/258 , G01S19/41 , G01S2205/008 , G01S5/0045 , H03D7/163 , H03J2200/11 , H04B1/00 , H04B2001/3894
摘要： A combined GPS and communication system having shared circuitry. The combined system includes an antenna for receiving data representative of GPS signals, a frequency converter coupled to the antenna, a frequency synthesizer coupled to the frequency converter, an analog to digital converter coupled to the frequency converter and a processor coupled to the frequency converter. The processor processes the data representative of GPS signals to determine a pseudorange based on the data representative of GPS signals. The integrated communication receiver includes a shared component which is at least one of the antenna, the frequency converter, the frequency synthesizer and the analog to digital converter. Typically, in certain embodiments the processor also demodulates communication signals received as well as controls the modulation of data to be transmitted as a communication signal through a communication link.
摘要翻译：具有共享电路的组合的GPS和通信系统。组合系统包括用于接收表示GPS信号的数据的天线，耦合到天线的频率转换器，耦合到变频器的频率合成器，耦合到变频器的模数转换器和耦合到变频器的处理器。处理器处理表示GPS信号的数据，以基于表示GPS信号的数据来确定伪距。集成通信接收机包括作为天线，频率转换器，频率合成器和模数转换器中的至少一个的共享部件。通常，在某些实施例中，处理器还对所接收的通信信号进行解调，并且通过通信链路控制要作为通信信号发送的数据的调制。

17. 发明授权

US6107870A Automatic compensation circuit for automatically compensating time constant of filter 失效
标题翻译：自动补偿电路自动补偿滤波器的时间常数
公开(公告)号：US6107870A
公开(公告)日：2000-08-22
申请号：US173178
申请日：1998-10-15
申请人： Mitsumo Kawano
发明人： Mitsumo Kawano
IPC分类号： H03H11/04 , H03J7/04 , H03L7/081 , H03L7/085 , H03L7/099 , H03K5/00
CPC分类号： H03L7/0805 , H03H11/0472 , H03J7/04 , H03L7/0812 , H03L7/085 , H03L7/099
摘要： A filter circuit having a first variable resistive element determining the time constant of the filter circuit and a band pass filter having a second variable resistive element determining the time constant of the band pass filter. Each variable resistive element is connected to receive a time constant control signal which is obtained through a compensation circuit which receives an output voltage signal from a phase detection circuit for detecting a phase difference between the output signal of the band pass filter and a reference signal. The compensation circuit has a comparison circuit for comparing a first voltage generated by a third variable resistive element and a second voltage generated by a constant trimming resistor to generate the output voltage signal. The resistive values of the first to third variable resistive elements vary in proportion to each other, thereby controlling the time constant of the filter circuit to be free from the influence of the variance of the resistive element of the filter circuit.
摘要翻译：滤波器电路，具有确定滤波器电路的时间常数的第一可变电阻元件和具有确定带通滤波器的时间常数的第二可变电阻元件的带通滤波器。每个可变电阻元件被连接以接收时间常数控制信号，该时间常数控制信号通过补偿电路获得，所述补偿电路接收来自用于检测带通滤波器的输出信号和参考信号之间的相位差的相位检测电路的输出电压信号。补偿电路具有比较电路，用于比较由第三可变电阻元件产生的第一电压和由恒定微调电阻产生的第二电压以产生输出电压信号。第一至第三可变电阻元件的电阻值彼此成比例地变化，从而控制滤波器电路的时间常数不受滤波器电路的电阻元件的变化的影响。

18. 发明授权

US5991612A Amplitude correction circuit 失效
标题翻译：振幅校正电路
公开(公告)号：US5991612A
公开(公告)日：1999-11-23
申请号：US821446
申请日：1997-03-21
申请人： Masahisa Saito
发明人： Masahisa Saito
IPC分类号： H03D7/14 , H03J7/04 , H04B1/16 , H04B1/26 , H04B1/06
CPC分类号： H03D7/14 , H03J7/04 , H04B1/26
摘要： With the circuit construction of a heterodyne receiver, a control circuit for correcting the amplitude level of a local oscillation signal according to an output signal of a detector circuit is connected to the output terminal of an amplifier for amplifying the local oscillation signal to set the amplitude level of the local oscillation signal input to the mixer to an adequate level.
摘要翻译：利用外差接收器的电路结构，根据检测器电路的输出信号校正本地振荡信号的振幅电平的控制电路连接到放大器的输出端子，用于放大本地振荡信号以设定振幅将本地振荡信号输入混频器的电平达到足够的水平。

19. 发明授权

US5933059A Method and apparatus for controlling frequency synchronization in a radio telephone 失效
标题翻译：用于控制无线电话中的频率同步的方法和装置
公开(公告)号：US5933059A
公开(公告)日：1999-08-03
申请号：US956163
申请日：1997-10-22
申请人： Ramanathan Asokan
发明人： Ramanathan Asokan
IPC分类号： H03J1/00 , H03J7/04 , H04L27/00 , H04L27/227 , H04L27/06
CPC分类号： H03J7/045 , H03J1/0008 , H04L27/2273 , H04L2027/0016
摘要： A method and apparatus for controlling frequency synchronization in a frequency correction feedback loop of a radio telephone. A processor in a frequency update controller ascertains increment/decrement values pro-proportionally related to confidence levels representing a ratio that a likelihood probability of estimated offset frequecies of an input carrier signal are accurate in proportion to a likelihood probability that the estimated offset frequencies are inaccurate. The processor adds or subtracts the value to a counter depending on its sign. When the counter reaches a certain predefined positive number, the counter is decremented by this number and the processor increases the frequency of a reference oscillator frequency. When the counter reaches a certain predefined negative number, the counter is incremented by the absolute value of the negative number and the processor decreases the frequency of the reference oscillator frequency.
摘要翻译：一种用于控制无线电话的频率校正反馈回路中的频率同步的方法和装置。频率更新控制器中的处理器确定与置信水平成比例地相关的增量/减量值，其表示输入载波信号的估计偏移频率的似然概率与估计的偏移频率不准确的似然概率成正比的准确比。处理器根据其符号将值添加或减去计数器。当计数器达到一定的预定正数时，计数器减少这个数字，并且处理器增加参考振荡器频率的频率。当计数器达到一定的预定负数时，计数器增加负数的绝对值，处理器降低参考振荡器频率的频率。

20. 发明授权

US5751114A Apparatus, method and article of manufacture for carrier frequency compensation in a FM radio transmitter 失效
标题翻译： FM无线电发射机载波频率补偿的装置，方法和制造
公开(公告)号：US5751114A
公开(公告)日：1998-05-12
申请号：US653307
申请日：1996-05-24
申请人： Andrew Dwight Dingsor
发明人： Andrew Dwight Dingsor
IPC分类号： H04B1/40 , H03J7/04 , H04B1/04 , H04L27/12 , H04B1/38 , H04L5/16
CPC分类号： H03J7/04 , H04L27/12
摘要： A method, apparatus and article of manufacture for compensating for carrier frequency error is disclosed. An FM signal is received from an antenna and the received FM signal is provided to receiver. The receiver takes the FM signal at the carrier frequency and outputs a baseband signal. This baseband signal is then processed by a DSP which provides carrier frequency compensation and decoding to produce a data stream that a microprocessor provides to a host device. Frequency differences between the FM carrier frequency and the frequency used to demodulate the FM signal can shift the DC bias level of the baseband signal. The DSP compensates for such frequency difference by using a receive compensation value and applying it to each received signal sample. When transmitting, data to be transmitted is provided from the host device to the DSP via a microprocessor. The DSP provides encoding and carrier frequency compensation of the data to provide an baseband signal to a transmitter that modulates the baseband signal to produce a FM signal at a desired carrier frequency. Frequency differences between the desired FM carrier frequency and the frequency used to modulate the baseband signal can produce errors in receiver systems. The DSP compensates for such a frequency difference by using a transmit compensation value and applying it to each encoded signal sample.
摘要翻译：公开了一种用于补偿载波频率误差的方法，装置和制品。从天线接收FM信号，并将接收到的FM信号提供给接收机。接收机以载波频率接收FM信号并输出基带信号。该基带信号然后由提供载波频率补偿和解码的DSP处理以产生微处理器向主机设备提供的数据流。 FM载波频率与用于解调FM信号的频率之间的频率差可能会改变基带信号的直流偏置电平。 DSP通过使用接收补偿值来补偿这种频率差，并将其应用于每个接收的信号样本。发送时，通过微处理器从主设备向DSP提供要发送的数据。 DSP提供数据的编码和载波频率补偿，以向调制基带信号的发射机提供基带信号，以产生所需载波频率的FM信号。所需的FM载波频率与用于调制基带信号的频率之间的频率差可能在接收机系统中产生误差。 DSP通过使用发射补偿值并将其应用于每个编码信号样本来补偿这样的频率差。

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