Adaptive Demodulation Performance over a Rayleigh Fading Channel

Adaptive demodulation (ADM) is a newly proposed rate adaptive system which operates without requiring channel state information at the transmitter (unlike adaptive modulation). We consider the performance of ADM (using 16-QAM and using 16-PSK) over a Rayleigh fading channel. A methodology is presented for the receiver to effectively choose its operating region based on the observed SNR at the receiver. New results are obtained for the spectral efficiency of the ADM system for both uncoded and coded bits