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    METHOD AND SYSTEM FOR FREQUENCY DRIFT PREDICTION
    1.
    发明公开
    METHOD AND SYSTEM FOR FREQUENCY DRIFT PREDICTION 审中-公开
    方法和系统频率漂移预测

    公开(公告)号：EP1792202A2

    公开(公告)日：2007-06-06

    申请号：EP05805186.3

    申请日：2005-09-08

    申请人： Motorola, Inc.

    发明人： BUSTAMANTE, Sergio ,  ALAM, Maqsud, M. ,  GOLDBERG, Mark, A.

    IPC分类号： G01S5/14

    CPC分类号： H03J7/04 ,  G01S19/235 ,  H03J1/005

    摘要： A method (200) of frequency drift prediction for use by a positioning receiver (106) can include the steps of determining (202) a moving average of a frequency error, determining (206) a moving average of a frequency drift rate in a communication device, determining (212) a frequency drift rate uncertainty, and providing (214) the moving average of frequency error and frequency drift rate, and the frequency drift rate uncertainty to the positioning receiver. A point-to-point slope from the running average of the instantaneous frequency error and a running average of the point-to-point slope for a predetermined time period can be determined (208 & 210). The frequency drift uncertainty or window is determined using information determined from the moving average of the frequency drift rate. The positioning receiver can be a global positioning receiver.

    METHOD AND SYSTEM FOR SYNCHRONIZATION IN A FREQUENCY SHIFT KEYING RECEIVER
    2.
    发明公开
    METHOD AND SYSTEM FOR SYNCHRONIZATION IN A FREQUENCY SHIFT KEYING RECEIVER 有权
    方法和系统中的同步FREQUENZUMTASTEMPFÄNGER

    公开(公告)号：EP1611706A2

    公开(公告)日：2006-01-04

    申请号：EP04758291.1

    申请日：2004-03-24

    申请人： MOTOROLA, INC.

    发明人： CARSELLO, Stephen, R. ,  GOLDBERG, Mark, A.

    IPC分类号： H04L7/00

    CPC分类号： H04L7/042 ,  H04L7/08 ,  H04L27/10 ,  H04L2007/047 ,  H04L2027/0065 ,  H04L2027/0095

    摘要： The invention provides a method and apparatus for timing and frequency synchronization during and after signal acquisition, respectively, in a digital communication receiver. The apparatus comprises: a receiver (110) receiving a plurality of data slots each containing a sync word (310); a correlator (220) forming multiple correlations of the received signal with a sinusoid of an expected frequency for each of the selected sync symbol intervals; a combiner (240) combining the multiple correlations according to the FSK modulation index ad known sync symbol pattern; a peak detector (230) forming a sync correlation signal of the maximum combiner output amplitude; a threshold detector (250) comparing the sync correlation signal to a threshold; a symbol timing estimator (270) establishing symbol timing based on the peak of the sync correlation signal; a frequency offset estimator (260); and a quality estimator (280) determining a quality of the frequency offset estimate using a SNR calculation.