Echo cancellation in high speed data transmission systems using adaptive layered bilinear filters

The authors propose a layered bilinear filter structure, and study its performance in an adaptive echo cancellation framework for high speed data transmission with precoding. In their application, they mainly consider the reduced order situations where the number of coefficients used in the echo canceller is less than that in the echo path. Computer simulation results show that when the echo path shows significant nonlinearity the layered form is effective in improving the echo cancellation performance with reduced computational complexity. Using bilinear echo cancellation with a small number of coefficients, echo return loss enhancement (ERLE) over the linear case improves by about 15 dB at a signal-to-noise ratio of 30 dB