Equalizer modifying a phase of a gain control signal to carry ou

Details Equalizer modifying a phase of a gain control signal to carry ou Equalizer modifying a phase of a gain control signal to carry ou

1984-06-11

1986-12-02

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

333 18, 364724, H03H 730

Patent

active

046270728

ABSTRACT:
In an equalizer for equalizing, by the use of zero forcing algorithm, an input signal obtained by modulating a carrier wave of a carrier frequency at a modulation rate, a specific one of complex control signals is modified into a modified complex signal and supplied to a specific one of gain control circuits of a transversal filter corresponding to a specific one of additional taps except a central tap. The modified complex signal is produced by rotating a phase of the specific complex control signal by a step equal to an integral multiple of .pi./2. Specifically, at least one of real and imaginary parts of the modified complex signal is inverted relative to those of the specific complex control signal. The real and the imaginary parts of the modified control signal are delivered to in-phase and quadrature portions of the specific gain control circuit in consideration of the step.

REFERENCES:
patent: Re31351 (1983-08-01), Falconer
patent: 3651316 (1972-03-01), Gibson
patent: 3750026 (1973-07-01), Watanabe
patent: 3755736 (1973-08-01), Kaneko et al.
patent: 3909752 (1975-09-01), Stuart
patent: 4453256 (1984-06-01), Ryu
patent: 4456893 (1984-06-01), Otani
patent: 4567599 (1986-01-01), Mizoguchi

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