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    • 9. 发明申请
    • IMPROVED TIME TRACKING LOOP
    • 改进的时间跟踪环
    • WO2003063377A1
    • 2003-07-31
    • PCT/US2002/001554
    • 2002-01-18
    • QUALCOMM INCORPORATEDBLESSENT, Luca
    • BLESSENT, Luca
    • H04B1/707
    • H04B1/7075H04B1/7085
    • A signal receiver uses overlapping sample accumulations in order to acquire and track a received spread spectrum signal with increased speed and accuracy. Sample accumulations are formed by grouping together a predetermined number of consecutive samples. Overlapping sample accumulations may then be created by overlapping a predetermined portion of adjacent sample accumulations. After the overlapping sample accumulations have been created they are transmitted to a timing discriminator in order to determine a timing error indicative of the difference between the timing of the received spread spectrum signal and the signal receiver timing. The timing discriminator compares early and late overlapping accumulation signals in order to determine an updated timing error. The receiver timing is thereafter adjusted according to the timing error. By overlapping the accumulations of samples, adjustments to the system timing may be made more rapidly than if disjoint samples are used.
    • 信号接收机使用重叠的采样累加,以便以增加的速度和精度来获取和跟踪接收的扩频信号。 通过将预定数量的连续样本分组在一起形成样本累加。 然后可以通过重叠相邻样本累积的预定部分来创建重叠样本累加。 在已经创建重叠采样累积之后,它们被发送到定时鉴别器,以便确定指示接收的扩频信号的定时与信号接收器定时之间的差的定时误差。 定时鉴别器比较早期和晚期重叠累加信号,以便确定更新的定时误差。 然后根据定时误差调整接收机定时。 通过重叠样本的累积,可以比使用不相交的样本更快地对系统定时进行调整。