Abstract:
This paper will preset the digital part of a GPS
based synchronization scheme developed for WiMAX
base stations. The PPS obtained from the GPS receiver
will discipline the VCXO oscillating frequency. The
accuracy of the clock reference will be bounded by the
PPS jitter. A digital method for reducing the PPS jitter
will be described. Also a controlling algorithm of the
VCXO when the PPS signal is lost will be presented. The
digital part of the scheme will be implemented on FPGA.
