Adaptive filter based on SAW injection-locked oscillator

A new adaptive filter for cancelling narrow-band interference in spread spectrum communications systems is described in this paper. The filter employs a SAW injection-locked oscillator (SAWILO) to track CW interference signal in a simulated spread spectrum system. The filter demonstrates a 20 dB interference cancellation over the locking bandwidth of SAWILO in real time. The filter offers the advantage in terms of complexity over other equivalent systems. The adaptive filter is presented with experimental measurements.