S-CDMA fixed wireless loop system employing subscriber unit/radi

Details S-CDMA fixed wireless loop system employing subscriber unit/radi S-CDMA fixed wireless loop system employing subscriber unit/radi

1997-12-10

2000-01-04

Pham, Chi H.

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

370320, 370503, 370342, H04B 7216

Patent

active

060117885

ABSTRACT:
A method is disclosed for operating a synchronous Code Division Multiple Access (S-CDMA) radio frequency communication system having a host transceiver unit and a plurality of user transceiver units. The method includes an initial step of defining a super-frame to be comprised of N sequential frames of data. In the preferred embodiment N is equal to three. For a user transceiver unit that obtains access to the host transceiver unit a next step of the method receives frames of data transmitted by the host transceiver unit and initially aligns a receiver timing and a transmitter timing of the user transceiver unit to a super-frame boundary of the received frames. A next step transmits frames of data from the user transceiver unit to the host transceiver unit using the initial timing alignment. A further step of the method detects at the host transceiver unit a difference between the arrival of the transmitted frames of data and a super-frame boundary and then transmits a timing correction parameter, preferably expressed in symbols, from the host transceiver unit to the user transceiver unit in order to align the transmitted frames of data to the super-frame boundary.

REFERENCES:
patent: 5499236 (1996-03-01), Giallorenzi et al.
patent: 5583853 (1996-12-01), Giallorenzi et al.
patent: 5673260 (1997-09-01), Umeda et al.
patent: 5914944 (1999-06-01), Haugli et al.
patent: 5920551 (1999-07-01), Na et al.

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