Pulse or digital communications – Repeaters – Testing
Patent
1998-01-30
2000-02-01
Tse, Young T.
Pulse or digital communications
Repeaters
Testing
375324, 375329, 329304, H04K 100, H04L 2722, H03D 322
Patent
active
060211571
ABSTRACT:
A system and method for synchronizing a Costas Loop for demodulating a received spread-spectrum signal having data and a first arbitrary phase angle, .phi.(t), using a phase detector, a phase unwrapping subsystem, an oscillator, a derotator and a decision device. A second arbitrary phase angle, .theta.(t), is generated from an in-phase component and a quadrature-phase component of the received spread-spectrum signal. The second arbitrary phase angle, .theta.(t), is proportional to the first arbitrary phase angle, .phi.(t). A value of .theta. proportional to .theta.(t) is then estimated. The estimated .theta. value is processed to obtain an estimate for the .phi.value, and a cosine and a sine of the estimated .phi. value are generated by the oscillator. The derotator derotates the in-phase-component and the quadrature-phase component of the received spread-spectrum signal with the cosine and the sine of the estimated .theta. value to generate a demodulated signal. The decision device evaluates the demodulated signal and outputs data.
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Davidovici Sorin
Kanterakis Emmanuel
Deppe Betsy L.
Golden Bridge Technology Inc.
Tse Young T.
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