公开(公告)号：WO1997004530A1

公开(公告)日：1997-02-06

申请号：PCT/US1996007192

申请日：1996-05-20

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  WETTERS, John ,  SIMMONS, John, Wayne ,  FERNANDEZ, Virgilio, Alejandro ,  AHRENS, Art ,  CARSELLO, Steve

IPC: H04B01/16

CPC classification number: H03J1/0008 ,  H03J2200/28

Abstract: A method of calibrating a radio receiver (100) which has a desired IF center frequency (fo) includes generating and applying to the receiver's demodulator (126) a plurality of reference signals. The demodulated reference signals are used to generate, for the demodulator, a transfer function that is predictive of amplitude versus frequency characteristics of signals to demodulated by the demodulator (126). The transfer function (202) is used to determine a frequency offset between a received signal's intermediate frequency and the desired frequency (fo). The determined frequency offset is used to adjust the IF frequency of the received signal towards the desired frequency (fo). The adjustment process preferably continues until the frequency offset is below a desired threshold. A receiver using the disclosed method is also described.

Abstract translation: 校准具有期望的IF中心频率（fo）的无线电接收机（100）的方法包括生成并向接收机的解调器（126）应用多个参考信号。 解调的参考信号用于为解调器生成预测由解调器（126）解调的信号的幅度 - 频率特性的传递函数。 传递函数（202）用于确定接收信号的中间频率和期望频率（fo）之间的频率偏移。 所确定的频率偏移用于将接收信号的IF频率调整到所需频率（fo）。 调整过程优选地继续直到频率偏移低于期望的阈值。 还描述了使用所公开的方法的接收机。

公开(公告)号：EP0839410A1

公开(公告)日：1998-05-06

申请号：EP96920289.0

申请日：1996-05-20

Applicant: MOTOROLA, INC.

Inventor： WETTERS, John ,  SIMMONS, John, Wayne ,  FERNANDEZ, Virgilio, Alejandro ,  AHRENS, Art ,  CARSELLO, Steve

IPC: H03J1

CPC classification number: H03J1/0008 ,  H03J2200/28

Abstract: A method of calibrating a radio receiver (100) which has a desired IF center frequency (fo) includes generating and applying to the receiver's demodulator (126) a plurality of reference signals. The demodulated reference signals are used to generate, for the demodulator, a transfer function that is predictive of amplitude versus frequency characteristics of signals to demodulated by the demodulator (126). The transfer function (202) is used to determine a frequency offset between a received signal's intermediate frequency and the desired frequency (fo). The determined frequency offset is used to adjust the IF frequency of the received signal towards the desired frequency (fo). The adjustment process preferably continues until the frequency offset is below a desired threshold. A receiver using the disclosed method is also described.