Title:
TIME TRACKING IN A NON-NEGLIGIBLE MULTIPATH SPACING ENVIRONMENT
Document Type and Number:
WIPO Patent Application WO2002061963
Kind Code:
A3
Abstract:
In an antenna diverstiy 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-neglible 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 trackin 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 times offsets for each finger. The preferred embodiment depends on the method used by the base station to multiplex the data onto multiple transmit antennas.
Inventors:
RICK ROLAND
SUBRAHMANYA PARVATHANATHAN
BUTLER BRIAN
PATEL SHIMMAN
EKVETCHAVAT THUNACHATE
SUBRAHMANYA PARVATHANATHAN
BUTLER BRIAN
PATEL SHIMMAN
EKVETCHAVAT THUNACHATE
Application Number:
PCT/US2002/000682
Publication Date:
September 19, 2002
Filing Date:
January 11, 2002
Export Citation:
Assignee:
QUALCOMM INC (US)
International Classes:
H04B7/06; H04B7/08; (IPC1-7): H04B1/707; H04B7/06
Domestic Patent References:
| WO2000024133A1 | 2000-04-27 |
Other References:
WEERACKODY V: "Diversity for the direct-sequence spread spectrum system using multiple transmit antennas", PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC). GENEVA, MAY 23 - 26, 1993, NEW YORK, IEEE, US, vol. 3, 23 May 1993 (1993-05-23), pages 1775 - 1779, XP010137186, ISBN: 0-7803-0950-2
Download PDF: