Demodulator with composite transversal equalizer and eye detecti

Details Demodulator with composite transversal equalizer and eye detecti Demodulator with composite transversal equalizer and eye detecti

1989-11-13

1990-12-04

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

329304, 375 80, 375 86, 375106, H04B 306, H04L 2738

Patent

active

049759272

ABSTRACT:
In a digital demodulator, a recovered baseband signal is sampled in response to a clock pulse supplied from a VCO and converted to a digital signal representing one of multilevels of the sampled signal. Real-axis and imaginary-axis transversal equalizers are provided. Each equalizer has a tapped delay line for receiving the digital signal, a plurality to tap weight multipliers connected respectively to taps of the tapped delay line, and an adder. The adder of the real-axis transversal equalizer sums all outputs of the tap weight multipliers except for the output of one which is connected to a tap adjacent to the center tap for producing a partially equalized signal, while the adder of the other equalizer sums all outputs of the tap weight multipliers for producing a fully equalized signal. Both of the equalized signals are summed by an adder and applied to a phase control circuit which derives from it a VCO control signal so that it corresponds to a tap-weight control signal applied to the multiplier whose output is excluded from being summed by the adder of the real-axis transversal equalizer. The output of the adder is summed with the excluded multiplier output and supplied to a tap weight controller which controls the multipliers of both transversal equalizers.

REFERENCES:
patent: 4627072 (1986-12-01), Ryu et al.
patent: 4859956 (1989-08-01), Mizoguchi
patent: 4908838 (1990-03-01), Mizoguchi

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