Combined adaptive equalization and demodulation circuit

H - Electricity – 04 – L

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333/27

H04L 25/03 (2006.01) H04B 3/04 (2006.01) H04L 27/01 (2006.01)

Patent

CA 1211515

18 ABSTRACT: An adaptive equalizer arrangement for digital transmission system comprises at the output of the trans- mission 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 com- prising, arranged in series, a mixer, a lowpass filter, a multiplier, and having their outputs connected to an adder which is followed by a sampling circuit and there- after by a comparator circuit to decide the symbols (âk;?k) to be transmitted from the outputs of these paths. The arrangement also comprises a third control path which comprises two subtracting circuits to deter- mine the differences (e'k;e"k) between the signals before (Xk;Yk) and after decision (âk;?k) and a control circuit of a voltage-controlled oscillator, 2n phase s ifters and 2n multipliers.

454069

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