Pulse or digital communications – Repeaters – Testing
Patent
1996-08-20
1998-04-21
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375324, 375329, 329304, H04K 100, H04L 2722, H03D 322
Patent
active
057426376
ABSTRACT:
A system and method for synchronizing a Costas Loop for demodulating a received spread-spectrum signal using a squaring device, a filter, a phase detector, a phase unwrapping subsystem, an oscillator, a derotator and a decision device. Phase-shift-keying modulation is removed from a received spread-spectrum signal through squaring. An in-phase component and a quadrature-phase component of the received spread-spectrum signal are filtered to generate an arbitrary phase angle, .theta.(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
Chin Stephen
Deppe Betsy L.
Golden Bridge Technology Inc.
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