Multi-user acquisition procedure for point-to-multipoint synchro

Details Multi-user acquisition procedure for point-to-multipoint synchro Multi-user acquisition procedure for point-to-multipoint synchro

1998-01-12

1999-05-11

Nguyen, Chau

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

370342, 370516, 375206, H04B7/216

Patent

active

059035510

ABSTRACT:
Disclosed are methods for acquiring a forward channel in a point-to-multipoint CDMA system. One method includes the steps of (a) despreading a received CDMA signal with a first pn code that is known to be present in the received CDMA signal and obtaining a first measure of received signal level; (b) despreading the received CDMA signal with a second pn code that is known not to be present in the received CDMA signal and obtaining a second measure of received signal level; and (c) synchronizing to a desired channel using a difference between the first and second signal levels. In this method the first step of despreading despreads a continuously transmitted side-channel, and the step of synchronizing synchronizes to the side-channel. Also, the step of obtaining a first measure of received signal level obtains a correlation peak, and the step of obtaining a second measure of received signal level obtains a correlation null. Preferably, the steps of despreading and obtaining are accomplished iteratively over a range of n first pn code phase states and over a range of n second pn code phase states.

REFERENCES:
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5295152 (1994-03-01), Gudmundson et al.
patent: 5574721 (1996-11-01), Magill
patent: 5583853 (1996-12-01), Giallorenzi et al.

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