Acquisition of a synchronous CDMA TDD QPSK waveform using...

Details Acquisition of a synchronous CDMA TDD QPSK waveform using... Acquisition of a synchronous CDMA TDD QPSK waveform using...

2007-09-18

2007-09-18

Ho, Duc (Department: 2616)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S252000, C370S342000, C370S503000, C375S150000, C375S149000

Reexamination Certificate

active

10284536

ABSTRACT:
A method and system for using power and timing estimates to acquire frame acquisition of a reverse CDMA carrier signal. The method includes providing at least one remote transceiver device acquiring a forward CDMA carrier signal, and the one remote transceiver device transmitting a reverse CDMA carrier signal modified to include a frequency associated with the forward CDMA carrier signal. A transceiver base station, in response to determining if the reverse CDMA carrier signal exceeds a reverse CDMA carrier signal threshold (RCCST), uses the frequency embedded in the modified reverse CDMA carrier signal to acquire phase of the reverse CDMA carrier signal. Achieving acquisition the transceiver base station signals a mode change to the remote transceiver. Otherwise, the transceiver base station signals the remote transceiver device to slip the reverse CDMA carrier signal a predetermined number of chips; and/or transmit the reverse CDMA carrier signal at a second power level.

REFERENCES:
patent: 5099493 (1992-03-01), Zeger et al.
patent: 6570842 (2003-05-01), Landolsi
patent: 6898197 (2005-05-01), Lavean
patent: 7133440 (2006-11-01), Horne et al.

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