The system includes a receiver for receiving a bit stream; an error monitor for
indicating a first error rate for a first set of data received in the bit stream;
and an adjustable circuit for converting an incoming signal into the bit stream
using a reference signal that is modulated using a control signal. The system also
includes a subsystem for correlating the first error rate and the control signal
to generate the reference signal. The control signal has an amplitude that is selected
so that a second set of data received in the bit stream has a second error rate
that is less than the first error rate.
