Pulse or digital communications – Repeaters – Testing
Patent
1986-10-20
1988-07-19
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 15, 375 67, 375103, H04L 512, H03H 730
Patent
active
047590394
ABSTRACT:
A technique is presented for simplifying the recovery of two synchronous data signals having a common symbol rate after each signal has respectively modulated a different one of a pair of quadrature-related carrier signals. In the transmitter, the data signal which modulates one of the quadrature-related carrier signals is delayed relative to the data signal which modulates the other quadrature-related carrier signal. This delay is related to an IF frequency chosen at the receiver. After passing through a noisy transmission channel, the quadrature-related carrier signals are coupled in the receiver to a serial combination of an equalizer and analog-to-digital converter. This combination outputs multiple, substantially distortion-free samples of the data signals each symbol interval. The two data signals are then recovered by selecting a subset of the samples provided each symbol interval.
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Debus, Jr. Walter
Reeve, III Howard C.
Siller, Jr. Curtis A.
American Telephone & Telegraph Company
Bell Telephone Laboratories Incorporated
Padnes David R.
Safourek Benedict V.
Telesz Jr. Andrew J.
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