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    • 2. 发明申请
    • METHOD AND APPARATUS PROVIDING AN AMPLITUDE INDEPENDENT AUTOMATIC FREQUENCY CONTROL CIRCUIT
    • 提供独立自动频率控制电路的方法和装置
    • WO2004001984A2
    • 2003-12-31
    • PCT/US0319254
    • 2003-06-18
    • NOKIA CORPKENNEY THOMASTAPANINEN JUKKA
    • KENNEY THOMASTAPANINEN JUKKA
    • H04B1/707H04L27/00H04B
    • H04L27/0014H04B1/712H04L2027/0055H04L2027/0069
    • An automatic frequency control (AFC) loop circuit includes a mixer for mixing a local oscillator signal with a received signal to generate a result signal; a frequency detector coupled to the result signal and outputting a loop error signal; a combiner circuit for combining error signals output from a plurality of fingers of a rake receiver with the loop error signal output fom the frequency detector to generate a combined loop error signal; a sign detector having an input coupled to an output of said combiner circuit for outputting a sign detector ouput signal for indicating a sign of the combined loop error signal; control circuitry for controlling a frequency of the local oscillator signal in accordance with the sign detector ouput signal and a loop filter partitioned into a first loop filter coupled between the output of the frequency detector and an input to the sign detector.
    • 自动频率控制(AFC)回路电路包括用于将本地振荡器信号与接收信号混合以产生结果信号的混频器; 耦合到所述结果信号并输出​​环路误差信号的频率检测器; 组合器电路,用于将来自瑞克接收机的多个指状输出的误差信号与所述频率检测器输出的环路误差信号相组合以产生组合的环路误差信号; 符号检测器,其具有耦合到所述组合器电路的输出的输入,用于输出用于指示组合回路误差信号的符号的符号检测器输出信号; 控制电路,用于根据符号检测器输出信号控制本地振荡器信号的频率;以及环路滤波器,其被分为耦合在频率检测器的输出端和符号检测器的输入端之间的第一环路滤波器。
    • 5. 发明申请
    • TIME TRACKING LOOP FOR PILOT AIDED DIRECT SEQUENCE SPREAD SPECTRUM SYSTEMS
    • 时间跟踪循环用于引导直接序列传播频谱系统
    • WO0117118A2
    • 2001-03-08
    • PCT/US0023763
    • 2000-08-29
    • NOKIA MOBILE PHONES LTDKENNEY THOMASXU WEIPING
    • KENNEY THOMASXU WEIPING
    • H04B1/7085H04B
    • H04B1/7085H04B2201/70701
    • A novel design of, and method of operation for, a coherent delay lock loop (DLL) for communication systems that employ a pilot channel or pilot symbols is disclosed. Pilot information is used to produce an estimate of signal phase and thereby remove the need for the magnitude operation within the DLL arms. The disclosed design and method afford better time-tracking performance by avoiding the squaring loss (due to the magnitude operation) encountered in noncoherent DLL designs. Alternative embodiments disclose designs and methods that are robust to signal amplitude variation. A first alternative normalizes a DLL error signal by a computed estimate of the squared magnitude of the pilot signal. A second alternative normalizes the error signal using only the early and late signals and therefore is applicable for noncoherent DLL designs as well as coherent DLL designs.
    • 公开了一种用于采用导频信道或导频符号的通信系统的相干延迟锁定环(DLL)的新颖设计和操作方法。 导频信息用于产生信号相位的估计,从而消除对DLL臂内的幅度操作的需要。 所公开的设计和方法通过避免在非相干DLL设计中遇到的平均损耗(由于幅度操作)而提供更好的时间跟踪性能。 替代实施例公开了对信号幅度变化而鲁棒的设计和方法。 第一替代方案是通过计算出的导频信号幅度平方的估计来对DLL错误信号进行归一化。 第二种替代方案仅使用早期和晚期信号来规范误差信号,因此适用于非相干DLL设计以及连贯的DLL设计。
    • 6. 发明申请
    • TIME TRACKING LOOP FOR PILOT AIDED DIRECT SEQUENCE SPREAD SPECTRUM SYSTEMS
    • 时间跟踪循环用于引导直接序列传播频谱系统
    • WO0117118A9
    • 2002-09-12
    • PCT/US0023763
    • 2000-08-29
    • NOKIA MOBILE PHONES LTDKENNEY THOMASXU WEIPING
    • KENNEY THOMASXU WEIPING
    • H04B1/7085H04B1/707
    • H04B1/7085H04B2201/70701
    • A novel design of, and method of operation for, a coherent delay lock loop (DLL) for communication systems that employ a pilot channel or pilot symbols is disclosed. Pilot information is used to produce an estimate of signal phase and thereby remove the need for the magnitude operation within the DLL arms. The disclosed design and method afford better time-tracking performance by avoiding the squaring loss (due to the magnitude operation) encountered in noncoherent DLL designs. Alternative embodiments disclose designs and methods that are robust to signal amplitude variation. A first alternative normalizes a DLL error signal by a computed estimate of the squared magnitude of the pilot signal. A second alternative normalizes the error signal using only the early and late signals and therefore is applicable for noncoherent DLL designs as well as coherent DLL designs.
    • 公开了一种用于采用导频信道或导频符号的通信系统的相干延迟锁定环(DLL)的新颖设计和操作方法。 导频信息用于产生信号相位的估计,从而消除对DLL臂内的幅度操作的需要。 所公开的设计和方法通过避免在非相干DLL设计中遇到的平均损耗(由于幅度操作)而提供更好的时间跟踪性能。 替代实施例公开了对信号幅度变化而鲁棒的设计和方法。 第一替代方案是通过计算出的导频信号幅度的平均值的估计来对DLL错误信号进行归一化。 第二种替代方案仅使用早期和晚期信号来规范误差信号,因此适用于非相干DLL设计以及相干DLL设计。