Patent ID: 6047022
Filing Date: 2000-04-04
Classification: H04L

Abstract:
Apparatus for reception of high speed data from a noisy communication channel, the apparatus comprising:a demodulator at one end of the noisy communication channel which receives and demodulates a primary input comprising signal and noise, the demodulator comprising:a decision unit generating a decision output A.sub.p from the primary input;a noise canceller receiving a noise canceller input signal X.sub.p and generating a noise canceller output signal Y.sub.p, the noise canceller including:a first adaptive digital filter receiving a first filter input signal U.sub.p and generating a first filter output signal V.sub.p, and a second adaptive digital filter receiving a second filter input signal W.sub.p and generating a second filter output signal H.sub.p ;a first adder for combining first and second adder inputs X.sub.p and A.sub.p into a first adder output U.sub.p, the first adder including a first delay unit delaying said first adder input, said first adder input comprising said noise canceller input signal X.sub.p, said second adder input comprising decision output A.sub.p, said first adder output comprising the first filter input signal U.sub.p to the first adaptive digital filter;a second adder for combining third and fourth adder inputs X.sub.p and V.sub.p into a second adder output Z.sub.p, said third adder input comprising the noise canceller input signal X.sub.p, said fourth adder input comprising the first filter output signal V.sub.p ;a third adder for combining fifth and sixth adder inputs Z.sub.p and A.sub.p into a third adder output W.sub.p, the third adder including a second delay unit delaying said fifth adder input, said fifth adder input comprising the second adder output Z.sub.p, said sixth adder input comprising the decision output A.sub.p, and wherein the third adder output W.sub.p comprises the second filter input signal;a fourth adder for combining seventh and eighth adder inputs Z.sub.p and H.sub.p into a fourth adder output Y.sub.p, said seventh adder input comprising the second adder output Z.sub.p, said eighth adder input comprising the second filter output signal H.sub.p, andwherein the noise canceller output signal Y.sub.p is a function of the sum of the first and second filter output signals V.sub.p and H.sub.p.