Pulse or digital communications – Systems using alternating or pulsating current – Antinoise or distortion
Patent
1996-01-16
1998-05-05
Bocure, Tesfaldet
Pulse or digital communications
Systems using alternating or pulsating current
Antinoise or distortion
375260, 375362, 375229, 375355, H04B 1500
Patent
active
057486778
ABSTRACT:
A method and system are provided for the transmission and reception of a varying reference signal together with a data-modulated signal in a communication system. The reference signal is modulated by multiplying it by a predetermined reference value sequence and is summed together with the data-modulated signal in the transmitter system. The reference signal and reference value sequence generators are identically embodied in both the transmitter and receiver systems. The receiver system determines an estimate of the transmitted reference signal by canceling the effect of the reference signal modulation. The estimated reference signal may be removed from the received signal prior to demodulation of the data-modulated signal by subtracting the unmodulated reference signal estimate, which is multiplied in the receiver system with the known reference value sequence.
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