The system performances of QAM and ARDPM are compared by calculating the error bound of two systems with diverse Doppler shift over fading channel.

• 在多谱勒频移较小时,ARDPM系统的性能优于QAM,但是随着多谱勒频移的增大,ARDPM系统的性能将迅速恶化,此时QAM系统的性能将优于ARDPM。