Reduction of signal processing requirements in a 2B1Q-code echo canceller or equalizer

摘要: The present invention provides a technique for data detection signal processing removing echo interference and/or distortion from received 2B1Q coded signal. According to the preferred technique, Q, where q=(-3, -1, +1, +3), is shifted one bit left generate corresponding symbol alphabet S, S=(-2, 0, +2, +4). signals are then processed through transversal filter. That is, provided delay line which tapped at intervals width of Each tap along connected an amplifier summing device that output y(n), ##EQU1## gains, or coefficients j , set subtract effects symbols adjacent in time desired symbol. In adaptive embodiment invention, y(n) resulting convolution between transmitted s(n) and gain . transmission channel filter accordance with convergence algorithm develop error feedback used update