公开(公告)号：JP2004007692A

公开(公告)日：2004-01-08

申请号：JP2003145156

申请日：2003-05-22

Applicant: ST MICROELECTRONICS INC

Inventor： MAKAROV ALEKSEJ

IPC: H04L27/22 ,  H04B7/01 ,  H04B7/26 ,  H04L27/00 ,  H04L27/227 ,  H04L27/233

Abstract: PROBLEM TO BE SOLVED: To provide an arithmetically efficient system and method to measure a frequency offset error. SOLUTION: This invention detects and stores counter-clockwise and clockwise quadrant transitions with respect to a composite signal received for a time period, then compares the transitions with each other to obtain information denoting both the magnitude and the phase of a frequency offset error, and further detects and stores zero crossing of the composite signal received for the same time period. The stored crossing provides information denoting the magnitude of the frequency offset. Then using the decided magnitude and phase of the frequency offset error adjusts the frequency of a local oscillator to provide enhanced receiver performance. COPYRIGHT: (C)2004,JPO

公开(公告)号：DE60327460D1

公开(公告)日：2009-06-10

申请号：DE60327460

申请日：2003-05-21

Applicant: ST MICROELECTRONICS INC

Inventor： MAKAROV ALEKSEJ

IPC: H04L27/22 ,  H04L27/233 ,  H04B7/01 ,  H04B7/26 ,  H04L27/00 ,  H04L27/227

Abstract: Counter-clockwise and clockwise quadrant transitions are detected and accumulated with respect to a received complex signal over a certain time period. These transitions may then be compared in order to obtain information indicative of both a magnitude and phase of a frequency offset error. Additionally, zero-crossings of the received complex signal over the same certain time period are detected and accumulated. The accumulated crossings provide information indicative of frequency offset magnitude. The determined magnitude and phase of the frequency offset error may then be used to adjust a local oscillator frequency to provide for improved receiver performance.