Title:
PN GENERATORS FOR SPREAD SPECTRUM COMMUNICATIONS SYSTEMS
Document Type and Number:
WIPO Patent Application WO2001056172
Kind Code:
A3
Abstract:
Techniques to improve the acquisition process in a spread spectrum environment. The signals from different CDMA systems are spread with different sets of PN sequences, with the PN sequences in each set being uncorrelated to the PN sequences in the other sets. By using uncorrelated PN sequences, the likehood of detecting a pilot signal from an undesired system is reduced or minimized, and the mean time to acquisition of the pilot signal from the desired system is improved. The mobile station can attempt to acquire the pilot signal by processing the received signal with a first set of PN sequences corresponding to a first hypothesis of the particular signal being acquired. If acquisition of the pilot signal fails, a second set of PN sequences corresponding to a second hypothesis is selected and used to process the received signal. The PN sequences in the second set are uncorrelated to the PN sequences in the first set. The PN sequences for the first set can be generated based on the characteristic polynomials defined by IS-95-A, and the PN sequences for the second set can be the reverse of the PN sequences for the first set.
Inventors:
BLACK PETER J
PADOVANI ROBERTO
WEAVER LINDSAY A JR
PADOVANI ROBERTO
WEAVER LINDSAY A JR
Application Number:
PCT/US2001/003243
Publication Date:
February 21, 2002
Filing Date:
January 31, 2001
Export Citation:
Assignee:
QUALCOMM INC (US)
International Classes:
H04B1/7073; H03K3/84; H04B1/707; H04J13/00; H04J13/10; H04W88/02; (IPC1-7): H04B1/707; H04B7/26
Foreign References:
| US5805648A | 1998-09-08 | |||
| US5781543A | 1998-07-14 |
Other References:
KIM D I ET AL: "I/Q MULTIPLEXED CODE ASSIGNMENT FOR FAST CELL SEARCH IN ASYNCHRONOUS DS/CDMA CELLULAR SYSTEMS", IEEE COMMUNICATIONS LETTERS, IEEE SERVICE CENTER, PISCATAWAY,US, US, vol. 2, no. 6, 1 June 1998 (1998-06-01), pages 159 - 161, XP000771820, ISSN: 1089-7798
Download PDF: