Multiplex communications – Communication over free space – Combining or distributing information via time channels
Reexamination Certificate
2007-08-28
2007-08-28
Marcelo, Melvin (Department: 2616)
Multiplex communications
Communication over free space
Combining or distributing information via time channels
C370S509000
Reexamination Certificate
active
10200450
ABSTRACT:
A method and system of synchronizing two nodes of a network uses a demodulated output signal of a time division multiplex (TDM) demodulator to perform frequency and timing synchronization independently. Frequency synchronization is performed without using a program clock reference, by detecting a symbol timing loop error of the TDM demodulator. The error is filtered by an oscillator control loop filter if the error is within a predetermined range. Thus, an output voltage of a digital to analog converter that receives the filtered output controls an oscillator. In the timing synchronizer, an error between a program clock reference (PCR) and a value of a counter in the terminal is computed if the PCR is a not a first PCR, and the error is filtered with a timing loop control filter. A processor then adjusts a value of the counter in the terminal based on the filtered output.
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Balasubramanian Ramakrishnan
Cronin Christopher J.
Bach Joseph
Marcelo Melvin
Viasat, Inc.
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