Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1997-04-07
1999-09-14
Pham, Chi H.
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
370350, H04J 306
Patent
active
059533277
ABSTRACT:
A method and apparatus are provided which enables all return links from the remote stations in a star configured CDMA system to be maintained in time synchronization. This method employs special synchronization codes in conjunction with a standard CDMA chip time tracking apparatus, such as a Delay Lock Loop. Each of these special synchronization codes possesses an extremely low cross-correlation property with each of the other codes in the set of synchronization codes. The low cross-correlation property exists for time offsets up to plus and minus one CDMA chip period which permits the use of a standard chip timing discriminator apparatus, such as an early-late gate, within the Delay Lock Loop. Given the extremely low cross-correlation of these special synchronization codes, a significant improvement is achieved in time tracking performance and/or return link signal efficiency over prior art.
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patent: 5623485 (1997-04-01), Bi
patent: 5623487 (1997-04-01), Natali
patent: 5638361 (1997-06-01), Ohlson et al.
patent: 5638362 (1997-06-01), Dohi et al.
Pham Chi H.
Stanford Telecommunications, Inc.
Yao Kwang B.
Zegeer Jim
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