Blind ISI cancellation by anchoring an arbitrary impulse response coefficient of channels

An algorithm for blind ISI cancellation in multi-user systems is developed in this paper. By minimizing the distance between the output of a filter and a reference signal with different time delay for two filters, the output of one filter turns out to be exactly equal to the ISI component of the output of the other filter. The difference between the output of these filters is the ISI-free estimate of the signal. With an appropriate selection of the time delay introduced for the reference signal, any coefficient of the channel impulse response which determines the scale of ISI-free estimate, can be anchored accordingly. Computer simulation has been conducted to illustrate the performance of this new method