Meeting Bit Error Rate (BER) for a design

SNR (Signal to Noise ratio) is related to BER such that higher SNR means lower BER. SNR margin is amount of additional signal loss that system can tolerate before BER increases above given level. SNR margin can be improved by utilizing DSP Adaptive filters to remove noise from signal. Adaptive filters are good for cancelling inter-Symbol-interference (ISI), echo, NEXT, FEXT.