Echo cancellation with reference signal generator and reliable receiving schemes for intersymbol interference

In the adaptive echo cancellation (EC) of the full-duplex two-wire data transmission, the problem of double-talk which disturbs adaptation procedure always exists since the far-end signal appeared continuously. To provide the reliable adaptation, the EC with decision-directed reference signal generator (RSG) was proposed. Additionally, the intersymbol interference (ISI) is another problem. Fortunately, for EC with far-end RSG, the information of pulse shape dispersion in channel is included in the RSG and is helpful for reducing the effect of dispersive channel. In this paper, some methods which sufficiently make use of this information are proposed to provide optimal receiving and decoding, and hence a lower bit error rate is obtained. © 1994 IEEE.