Coded data generation or conversion – Analog to or from digital conversion – Using optical device
Reexamination Certificate
2006-06-20
2006-06-20
Pak, Sung (Department: 2874)
Coded data generation or conversion
Analog to or from digital conversion
Using optical device,
C341S143000, C385S042000
Reexamination Certificate
active
07064697
ABSTRACT:
Interference caused by the propagation of a transmit signal transmitted from a transmit antenna to a receive antenna is effectively cancelled by an improved signal cancellation system. The system includes an interference cancellation signal generator that generates a time-delayed and amplitude-reduced representation of said transmit signal. A summing stage is operably coupled to the interference cancellation signal generator and the receive antenna. The summing stage subtracts the time-delayed and amplitude-reduced representation of the transmit signal from a receive signal to substantially cancel the interference. The interference cancellation signal generator preferably includes a novel programmable optical delay line that introduces a variable amount of optical delay to an optical signal derived from said transmit signal in addition to a thyristor-based sigma delta modulator that converts samples of the transmit signal to into a digital signal in the optical domain.
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Cai Jianhong
Taylor Geoff W.
Upp Daniel C.
Gordon & Jacobson P.C.
Pak Sung
The University of Connecticut
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