公开(公告)号：AU2002351161A1

公开(公告)日：2004-06-18

申请号：AU2002351161

申请日：2002-11-26

Applicant: QUALCOMM INC

Inventor： EKVETCHAVIT THUNACHATE ,  SINDHUSHAYANA NAGABHUSHANA T ,  GURELLI MEHMET ,  BLACK PETER J

IPC: A01C1/04 ,  H03M13/09 ,  H04B1/707 ,  H04J3/06 ,  H04L1/00 ,  H04L1/22 ,  H04L7/04 ,  H04L12/56

Abstract: A receiver system determines a current preamble threshold and a current preamble metric and determines whether a preamble is detected. If a preamble is detected, the receiver determines whether an earlier preamble has been detected in an earlier time slot having a common time slot interlace index, and resolves multiple detections of a preamble based on at least one of the current preamble and an old preamble thresholds, the current and an old preamble metrics. The receiver decodes data following the selected preamble and determines the CRC of the decoded data. If a CRC failure is detected, the receiver determines a new current preamble threshold. The new current preamble threshold is larger than the current preamble threshold. If the current preamble metric is larger than the new current preamble threshold, the receiver determines the CRC failure as an actual CRC failure, otherwise as a false CRC failure.

公开(公告)号：AT537612T

公开(公告)日：2011-12-15

申请号：AT02717318

申请日：2002-01-11

Applicant: QUALCOMM INC

Inventor： RICK ROLAND ,  SUBRAHMANYA PARVATHANATHAN ,  BUTLER BRIAN ,  PATEL SHIMMAN ,  EKVETCHAVIT THUNACHATE

IPC: H04B1/707 ,  H04B7/06 ,  H04B7/08

Abstract: In an antenna diversity environment, the timing offset of the receiver's fingers are based on the timing offset of the received peaks of the base station transmit signals. In a system with non-negligible multipath spacing, the timing offset of the received peaks of the base station transmit signals are not necessarily at the same location. In one embodiment, the demodulating elements for the signal from each base station antenna use the same offset for demodulating and determining an error signal based on pilot signal sampling prior to the timing offset and subsequent to the timing offset. The error signals are averaged and used by a time tracking loop to track the incoming signal. In another embodiment, the demodulating elements for the signal from each base station antenna independently time track the signals with different timing offsets for each finger. The preferred embodiment depends on the method used by the base station to multiplex the data onto multiple transmit antennas.