AFC apparatus and method used a in mobile communication system
    143.
    发明公开
    AFC apparatus and method used a in mobile communication system 有权
    AFC装置和方法在移动通信系统

    公开(公告)号:EP1109313A2

    公开(公告)日:2001-06-20

    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

    CPC分类号: H03J7/02

    摘要: An AFC control apparatus in mobile communication equipment includes a depreading unit, first integrator, and control section. A despreading section despreads the reception signal. The first integrator 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 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.

    Procédé et dispositif de synchronisation d'un recepteur de communication
    144.
    发明公开
    Procédé et dispositif de synchronisation d'un recepteur de communication 有权
    Verfahren und vorrichtung zur同步eineskommunikationsempfängers

    公开(公告)号:EP1081855A1

    公开(公告)日:2001-03-07

    申请号:EP00402405.5

    申请日:2000-08-31

    IPC分类号: H03J7/02 H04L27/233 H04L7/08

    摘要: Le procédé évalue un écart entre une fréquence de modulation, combinée à un premier signal en bande de base pour former un signal émis et une fréquence employée par le récepteur pour former un second signal en bande de base à partir d'un signal reçu, afin d'ajuster la fréquence employée par le récepteur. Connaissant un segment temporel du premier signal et la position temporelle d'un segment correspondant du second signal, les segments comprenant N échantillons à une fréquence d'échantillonnage F e , on calcule une transformée en fréquence Y(f), de taille N, du produit du complexe conjugué dudit segment du premier signal par le segment correspondant du second signal, et on évalue l'écart de fréquence Δf qui rend la transformée en fréquence Y(f) la plus proche de C.S c (f-Δf), où S c (f) = 1-exp(-2jπNf/F e ) 1-exp(-2jπf/F e ) , et C est un coefficient complexe.

    摘要翻译: 该方法包括评估用于发射信号的第一频率调制与受体使用的第二调制频率之间的差以从接收信号产生发射信号。 一旦确定了差异,结果就用于同步信号。 适用于执行该方法的同步装置还包括独立权利要求。

    SYSTEM AND METHOD FOR HARMONIC INTERFERENCE AVOIDANCE IN CARRIER RECOVERY FOR DIGITAL DEMODULATION
    147.
    发明公开
    SYSTEM AND METHOD FOR HARMONIC INTERFERENCE AVOIDANCE IN CARRIER RECOVERY FOR DIGITAL DEMODULATION 失效
    SYSTEM AND METHOD FOR载波恢复干扰减少对数码印刷解调

    公开(公告)号:EP0962046A2

    公开(公告)日:1999-12-08

    申请号:EP98903523.0

    申请日:1998-01-15

    IPC分类号: H03D7 H03J1 H03J7 H04B1

    摘要: The present invention relates to an improved demodulator for locking onto and tracking a carrier. Harmonic frequencies are occasionally generated by demodulation circuitry. When this occurs, the harmonic frequencies can interfere with the demodulator's locking and tracking functions, especially if the harmonic frequencies are near a down converted carrier's frequency. A system and method are disclosed which provides an offset to a frequency synthesizer (107) whose output frequency (F1, F2) is used to down convert (104) the carrier. The offset alters the frequency of the down converted carrier so as to shift it away from the interfering harmonics. In this regard, the demodulator is enabled to lock onto and track a carrier when previously not possible.

    Communication system with frequency control circuit
    148.
    发明公开
    Communication system with frequency control circuit 失效
    社区系统

    公开(公告)号:EP0913936A2

    公开(公告)日:1999-05-06

    申请号:EP98107296.0

    申请日:1998-04-22

    IPC分类号: H03J7/02

    摘要: In a communication system using the time diversity transmission scheme, the communication system provided with the stable automatic frequency control circuit with the wide frequency pull-in range and under low CN ratio transmission is achieved by removing the modulation phase from the received data through the application of the data correlation of the time diversity. The frequency offset in the received signal is compensated as the phase rotator rotates the phase of the received signal, the phase converter converts the phase rotator output into a phase, the serial-to-parallel converter converts the phase converter outputs into serial-to-parallel sequence, the delay units gives a delay to the serial-to-parallel converter output, the phase adder adds the serial-to-parallel converter output to the delay unit output, the multiplier multiplies the phase adder output by a certain value, the integrator integrates the multiplier output, another integrator integrates the integrator output, and the phase rotator controls the phase of the received signal based on the other integrator output.

    摘要翻译: 在使用时间分集传输方案的通信系统中,具有宽频率拉入范围和低CN比传输的稳定自动频率控制电路的通信系统通过应用从接收到的数据中去除调制相位来实现 的时间分集的数据相关性。 当相位旋转器接收信号的相位旋转时,接收信号中的频率偏移被补偿,相位转换器将相位旋转器输出转换成相位,串并转换器将相位转换器输出转换成串 - 并联序列,延迟单元给串并转换器输出延时,相位加法器将串并转换器输出相加到延迟单元输出,乘法器将相位加法器输出乘以一定值, 积分器积分乘法器输出,另一个积分器集成了积分器输出,相位旋转器根据其他积分器输出控制接收信号的相位。

    Verfahren zum Einstellen der Sendeträgerfrequenz in einer Teilnehmerstation eines Punkt-zu-Mehrpunkt Funkübertragungssystems
    149.
    发明公开
    Verfahren zum Einstellen der Sendeträgerfrequenz in einer Teilnehmerstation eines Punkt-zu-Mehrpunkt Funkübertragungssystems 失效
    一种用于在点对多点无线电传输系统的用户台调整发送载频方法

    公开(公告)号:EP0899897A2

    公开(公告)日:1999-03-03

    申请号:EP98104567.7

    申请日:1998-03-13

    申请人: ROBERT BOSCH GMBH

    IPC分类号: H04B7/24

    CPC分类号: H03J7/02

    摘要: Ein Verfahren, das ohne besonderen Hardwareaufwand für die Synchronisierung der Trägerfrequenzen zwischen der Basisstation und den Teilnehmerstationen auskommt, besteht darin, daß alle Empfangs- und alle Sendeträgerfrequenzen der Basisstation von einer gemeinsamen Referenzfrequenz (ZFLOBS) abgeleitet werden und daß jeweils ein von einer Teilnehmerstation ausgesendeter Sendeträger mit der korrespondierenden Empfangsträgerfrequenz in der Basisstation verglichen wird. Eine daraus ermittelte Frequenzablage wird der Teilnehmerstation mitgeteilt und die Sendeträgerfrequenz dieser Teilnehmerstation so eingestellt, daß die Frequenzablage minimal wird.

    摘要翻译: 用户站通知该用户台的发射载波和基站的接收载波之间检测到的频率漂移的,所以没有用户站的发射载波频率,寻求方式调整,做了频率漂移变得最小。 该方法涉及调整用户站的发射载波频率,其包括一个调制解调器,在点对多点无线电传输系统与基站的所有其装备有许多调制解调器,作为可以在无线电联系得到的用户站的最大数目 用它。 所述基站的所有reception-和发射载频是从一个共同的参考频率得到的。 由用户站发送出的每个发射载波与基站对应的接收载波频率相比较。 用户台的发射载波和基站的接收载波之间的确定性的开采频率漂移被通知给用户台,并且用户台的发射载波频率,寻求方式调整,做了频率漂移变得最小。

    METHOD AND APPARATUS FOR CONTROLLING FREQUENCY OF A MULTI-CHANNEL TRANSMITTER
    150.
    发明公开
    METHOD AND APPARATUS FOR CONTROLLING FREQUENCY OF A MULTI-CHANNEL TRANSMITTER 失效
    方法和装置,用于调节多通道发射器频率

    公开(公告)号:EP0872051A2

    公开(公告)日:1998-10-21

    申请号:EP96911237.0

    申请日:1996-02-28

    IPC分类号: H04B1 H03B21 H03J7

    摘要: A method and apparatus for controlling frequency of a multi-channel transmitter. A reference frequency is generated and emitted to a thermally stable frequency discriminator. The thermally stable frequency discriminator emits a dc voltage to a plurality of individual oscillators. The individual oscillators in continuous wave mode or modulated by baseband signals are combined into a multi-channel signal at an intermediate range of frequencies. The multi-channel intermediate range of frequencies is preferably amplified and emitted as an output signal. At relatively lower frequencies, such as 4-6 GHz, up-conversion of the output signal is not necessary. At relatively higher frequencies, an up-converter can be used to employ a second thermally stable frequency discriminator.