公开(公告)号：EP1227586A3

公开(公告)日：2004-06-09

申请号：EP02001110.2

申请日：2002-01-23

申请人： NEC CORPORATION

发明人： Matsumoto, Mariko ,  Ono, Shigeru

IPC分类号： H03J7/02

CPC分类号： H03J1/0066 ,  H03J7/02 ,  H03J7/026 ,  H03J2200/02 ,  H03L7/085 ,  H03L7/16 ,  H03L7/235

摘要： A portable radio terminal for realizing automatic frequency control (AFC) for automatically controlling the oscillation frequency of an oscillator includes a unit for intermittently performing AFC operation, and a unit for shortening an AFC operation stop period when the frequency shift of the oscillation frequency is large. An AFC control method is also disclosed.

公开(公告)号：EP1395072A1

公开(公告)日：2004-03-03

申请号：EP02730880.8

申请日：2002-06-03

申请人： MITSUBISHI DENKI KABUSHIKI KAISHA

发明人： YAMAUCHI, Takahisa, c/o MITSUBISHI DENKI ,  SHIBUYA, Akihiro, c/o MITSUBISHI DENKI

IPC分类号： H04Q7/32 ,  H04L7/02

CPC分类号： H04L7/033 ,  G04G3/02 ,  H03J7/02 ,  H04W52/029 ,  Y02D70/00

摘要： A radio communication apparatus includes a low-rate clock oscillator (2) for generating a low-rate clock signal used for reception timing estimation; a frequency deviation measuring duration controller (8) for determining a deviation measuring duration of measuring a frequency deviation of the low-rate clock signal in accordance with an intermittent time interval of the radio signal; a frequency deviation measuring section (5) for measuring the frequency deviation of the low-rate clock signal over the deviation measuring duration; and a timing counter (7) for correcting the frequency deviation of the low-rate clock signal, for measuring an intermittent span of the received signal in response to the low-rate clock signal after the correction, and for generating the estimated reception timing of the radio signal.

公开(公告)号：EP1383239A1

公开(公告)日：2004-01-21

申请号：EP02015921.6

申请日：2002-07-17

申请人： STMicroelectronics N.V.

发明人： Kirsch, Miguel ,  Berens, Friedbert

IPC分类号： H03J7/02

CPC分类号： H03J7/02 ,  H04J13/0044

摘要： On reçoit un signal connu à spectre fréquentiel étalé que l'on transforme en un signal numérique échantillonné formé de symboles et à spectre fréquentiel désétalé, on détermine pour chaque symbole une erreur fréquentielle résiduelle f e , on filtre FLT cette erreur et on corrige la fréquence de l'oscillateur local VCO avec cette erreur filtrée. On mémorise la première erreur fréquentielle résiduelle déterminée f e 1 , on détermine la moyenne des valeurs absolues d'un nombre prédéterminé d'erreurs fréquentielles résiduelles successives, on compare cette moyenne à un seuil prédéterminé, et si cette moyenne est supérieure ou égale audit seuil, on corrige la fréquence de l'oscillateur local avec une erreur égale à -sgn( f e 1 )(1/T - | f e 1 |), où sgn est la fonction « signe », | | la fonction valeur absolue et T la durée d'un symbole, avant de déterminer l'erreur fréquentielle résiduelle suivante associée au symbole suivant.

摘要翻译： 存储第一确定的剩余频率误差，对于预定数量的连续残差频率误差计算平均值，并将平均值与预定阈值进行比较。 如果该值超过阈值，则振荡器频率以等于-sgn（fe1）（1 / T- / fe1 /）的误差进行校正，其中sgn是所谓的符号函数，//是绝对函数值， 在确定与以下符号相关联的后续残余频率误差之前，T是符号的持续时间。 接收具有扩展频谱的已知信号，然后将其变换为包含符号并具有解扩频谱的采样数字信号。 确定每个符号的残差频率误差，滤波误差（FLT），并使用该滤波误差校正本机振荡器频率。 还包括以下独立权利要求：（1）执行该方法的振荡器频率控制装置; 和（2）包含该频率控制装置的DS-CDMA型接收机。

公开(公告)号：EP1148643A3

公开(公告)日：2003-11-05

申请号：EP01250121.9

申请日：2001-04-05

申请人： NEC CORPORATION

发明人： Inahashi, Atsushi, c/o NEC Saitama, Ltd.

IPC分类号： H03J7/04

CPC分类号： H03J7/02 ,  H03J7/04

摘要： To ensure frequency stability of a radio frequency in a radio communication apparatus for generating the radio frequency synchronizing with a transmission path frequency of digital data transmitted from a wire digital transmission path and so on. Concerning influence of a difference of a transmission path frequency that obstructs stability of a radio carrier frequency, the difference of a transmission path frequency (12b) is compared with a high-stability radio reference clock (22a), the difference frequency (17a) is detected by a counter (71), and frequency offset of a radio-station-transmission signal of a local oscillator (61) is made on the basis of the differential frequency. By the operation, the influence of the difference of the transmission path frequency that obstructs the stability of the radio carrier frequency (63a) can be compensated.

公开(公告)号：EP1109313A3

公开(公告)日：2003-10-15

申请号：EP00127154.3

申请日：2000-12-12

申请人： NEC CORPORATION

发明人： Hirata, Masaru

IPC分类号： H03J7/02 ,  H04B1/707 ,  H04B7/26

CPC分类号： H03J7/02

摘要： An AFC control apparatus in mobile communication equipment includes a despreading unit (4), first integrator (5), and control section (10). The despreading section (4) despreads the reception signal. The first integrator (5) integrates despread outputs obtained by despreading, of pilot symbols contained in a pilot channel of the reception signal, N (N is a number of 2 or more) consecutive first symbols and N second symbols succeeding the N first symbols, and generates first and second integral outputs. The control section (10) detects any phase shift amount between the first and second integral outputs and controls the frequency of the local signal in accordance with the detected phase shift amount. An AFC control method and mobile communication equipment having the above apparatus and method are also disclosed.

摘要翻译： 移动通信设备中的AFC控制装置包括解扩单元（4），第一积分器（5）和控制部（10）。 解扩部（4）对接收信号进行解扩。 第一积分器（5）将通过解扩获得的解扩输出，包含在接收信号的导频信道中的导频符号N（N是2个以上的数目）连续的第一符号和N个第一符号后的N个第二符号， 并产生第一和第二积分输出。 控制部（10）检测第一和第二积分输出之间的任何相移量，并且根据检测到的相移量来控制本地信号的频率。 还公开了具有上述装置和方法的AFC控制方法和移动通信设备。

公开(公告)号：EP1012970B1

公开(公告)日：2003-08-06

申请号：EP99929516.5

申请日：1999-07-07

申请人： Pace Micro Technology Ltd

发明人： COE, Peter W.

IPC分类号： H03J7/02

CPC分类号： H03J7/02

摘要： The invention to which this application relates is to provide a means for use in electrical and electronic apparatus, such as apparatus for the receipt of television signals in either analogue or digital form, and to allow components within the apparatus which are required to operate at set frequencies or within set frequency range, to be set and/or adjusted prior to, or during, use of the apparatus with reference to an RFTV modulator. This ensures that the components are set and maintained within predetermined parameters and also overcomes the need for additional time in the manual setting and/or adjusting of the devices and/or the provision of additional components to prevent frequency drift as is the case in conventional apparatus.

公开(公告)号：EP1269216A2

公开(公告)日：2003-01-02

申请号：EP01924149.6

申请日：2001-03-13

申请人： Cellguide Ltd.

发明人： NIR, Joseph ,  SHAYEVITS, Baruch ,  COHEN, Hanoch

IPC分类号： G01S5/14 ,  G01S1/04

CPC分类号： G01S19/235 ,  H03J7/02

摘要： A locator using Navstar constellation signals for determining geographical location of a mobile receiver. The locator is integrated with a mobile unit of a cellular network, which derives its reference frequency from a local oscillator (26). A frequency measuring module (28) counts the number of digital numbers derived from the local oscillator passing between two consecutive time-tagged indicators of the cellular network. The estimated frequency is calculated by dividing the number of digital numbers by the nominal time interval (T0) between the indicators.

公开(公告)号：EP0901664B1

公开(公告)日：2001-09-05

申请号：EP97925838.1

申请日：1997-05-05

申请人： SIEMENS AKTIENGESELLSCHAFT

发明人： ZIMMER, Herbert

IPC分类号： G06K7/08 ,  G06K7/10 ,  H03J7/02

CPC分类号： H03J7/02 ,  G06K7/0008 ,  H02J5/005 ,  H02J50/12 ,  H04B5/0031 ,  H04B5/0037 ,  H04B5/0056

公开(公告)号：EP1050109A2

公开(公告)日：2000-11-08

申请号：EP99941839.5

申请日：1999-09-02

申请人： SAMSUNG ELECTRONICS CO., LTD.

发明人： LEE, Hyun-Kyu

IPC分类号： H03L7/00

CPC分类号： H04M3/00 ,  H03J7/02 ,  H03J2200/02 ,  H04L2027/0065 ,  H04L2027/0071 ,  H04W88/06

摘要： An AFC (Automatic Frequency Control) device and a method of controlling reception frequency in a dual-mode terminal. When a dual-mode terminal uses one or two AFC circuits (151), time required for acquiring tracking synchronization in a PLL circuit (117, 137) for a frequency can be reduced using a test augmentation frequency being an integer multiple of a tracking synchronization acquiring residual frequency of a PLL (117, 137) circuit for another frequency to which the first frequency transits for reliable synchronization acquisition. Errors with respect to an output dynamic range caused by use of two AFCs are reduced and thus the demodulation performance of a receiver is ensured by varying quantization bits of an A/D clock based on the dynamic range of residual errors in a frequency area. The demodulation performance can also be ensured by operating an ACPE circuit for an AFC circuit having many residual frequency errors. In this method, the frequency characteristics of the dual-mode terminal are stabilized and the stability of a demodulator is increased due to a frequency offset. As a result, the stable demodulator performance is ensured.

公开(公告)号：EP0674387B1

公开(公告)日：2000-05-31

申请号：EP95301842.1

申请日：1995-03-20

申请人： Samsung Electronics Co., Ltd.

发明人： Choi, Yang-Seok

IPC分类号： H03J7/02

CPC分类号： H03J7/02