Simplified recovery of data signals from quadrature- related...

Details Simplified recovery of data signals from quadrature- related... Simplified recovery of data signals from quadrature- related...

H - Electricity

04

L

325/120, 325/47

H04L 27/02 (2006.01) H04L 27/36 (2006.01) H04L 27/38 (2006.01)

Patent

CA 1265202

-11- SIMPLIFIED RECOVERY OF DATA SIGNALS FROM QUADRATURE-RELATED CARRIER SIGNALS 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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