公开(公告)号：US5987073A

公开(公告)日：1999-11-16

申请号：US825243

申请日：1997-03-27

申请人： Paul Gothard Knutson

发明人： Paul Gothard Knutson

IPC分类号： H04L27/38 ,  H04L7/00 ,  H04L7/033 ,  H04L25/49 ,  H04L27/22

CPC分类号： H04L25/4921 ,  H04L7/0334 ,  H04L7/0335

摘要： A symbol timing recovery (STR) error detector includes a complex multiplier and a Gardner-type symbol timing error estimator for operation with carrierless amplitude phase (CAP) signals. Quadrature Ir and Qr signals from the system are input to the complex multiplier, which also receives signals from a numerically controlled oscillator operating at the CAP center frequency. The output of the complex multiplier is provided to the input of the Gardner STR error estimator. An added frequency shift allows the Gardner error estimator to function with CAP signals. The output from the error estimator is provided to a loop filter the output of which is provided to an oscillator which generates the symbol timing information for a symbol sampling network.

摘要翻译： 符号定时恢复（STR）误差检测器包括用于无载波幅度相位（CAP）信号操作的复数乘法器和加德纳型符号定时误差估计器。 来自系统的正交Ir和Qr信号被输入到复数乘法器，其也从在CAP中心频率处操作的数控振荡器接收信号。 复数乘法器的输出提供给Gardner STR误差估计器的输入。 增加的频移允许加德纳误差估计器与CAP信号一起工作。 来自误差估计器的输出被提供给环路滤波器，其输出被提供给生成符号采样网络的符号定时信息的振荡器。