Decision directed adaptive demodulation

A new technique is proposed for demodulation of phase modulated signals. The new technique is called Decision Directed Adaptive Demodulation (DDAD) which is an adaptive match filtering algorithm that uses an estimate of the present symbol in the adaptation algorithm. The DDAD replaces the carrier-recovery and baud detection sections found in conventional demodulators. Conventional carrier recovery utilizing phase lock loops is limited to acquisition over a relatively narrow bandwidth and low noise conditions. The advantages of the DDAD include a wide acquisition range, robustness to noise, and rapid initial acquisition.