Combined adaptive equalization and demodulation circuit

Details Combined adaptive equalization and demodulation circuit Combined adaptive equalization and demodulation circuit

1984-06-28

1986-06-10

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 14, 333 18, 364724, H04B 314

Patent

active

045947252

ABSTRACT:
An adaptive equalizer arrangement for digital transmission system comprises at the output of the transmission channel a first in-phase path and in parallel with this first path, a second quadrature path, both paths being of the non-recursive transversal filter type having n branches and (n-1) delay circuits between the inputs of these branches, each of these n branches comprising, arranged in series, a mixer, a low-pass filter, a multiplier, and having their outputs connected to an adder which is followed by a sampling circuit and thereafter by a comparator circuit to decide the symbols to be transmitted from the outputs of these paths. The arrangement also comprises a third control path which comprises two subtracting circuits to determine the differences between the signals before and after decision and a control circuit of a voltage-controlled oscillator, 2n phase shifters and 2n multipliers.

REFERENCES:
patent: 3890572 (1975-06-01), Desblanche et al.
patent: 4475211 (1984-10-01), Mattis, Jr. et al.

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