公开(公告)号：WO2003003682A1

公开(公告)日：2003-01-09

申请号：PCT/IB2002/001956

申请日：2002-06-03

Applicant: NOKIA CORPORATION

Inventor： SCHETELIG, Markus ,  BURGESS, Paul

IPC: H04L25/06

CPC classification number: H04L25/063 ,  H04L25/062 ,  H04L27/142

Abstract: The invention relates to a method and a device for estimating the DC offset portion of signal, especially of a signal containing parts with sinusoidal shaping, for example a signal which results from demodulation of a frequency modulated receive signal. According to the invention a method is presented for correcting the direct current offset portion (DC offset) of a first signal (Signal 1) which comprises the following steps: - phase shifting the first signal (Signal 1) for obtaining a second signal (Signal 2); comparing the first signal (Signal 1) and the second signal (Signal 2) with an estimated DC offset. The estimated DC offset is adjusted if the result of the comparison is, that the first signal (Signal 1) and the second signal (Signal 2) are on different sides of said estimated DC offset and the estimated DC offset is kept constant as long as the result of the comparison is, that the first signal (Signal 1) and the second signal (Signal 2) are on the same side of the estimated DC offset.

Abstract translation: 本发明涉及一种用于估计信号的DC偏移部分的方法和装置，特别是用于估计包含具有正弦整形的部分的信号，例如由调频接收信号的解调产生的信号。 根据本发明，提出一种用于校正第一信号（信号1）的直流偏移部分（DC偏移）的方法，其包括以下步骤： - 移位第一信号（信号1）以获得第二信号（信号 2）; 将第一信号（信号1）和第二信号（信号2）与估计的DC偏移进行比较。 如果比较结果是第一信号（信号1）和第二信号（信号2）在所述估计的DC偏移的不同侧，并且估计的DC偏移保持恒定，则调整估计的DC偏移，只要 比较的结果是，第一信号（信号1）和第二信号（信号2）位于估计的DC偏移的同一侧。