Abstract:

The method of multilevel parallel phase modulation (MPPM) was proposed, which means two parallel multilevel phase shift keying（MPSK） signals were transmitted with one frequency at the same symbol period. The MPPM system model was presented and the mechanisms of modulation and demodulation of MPPM were theoretically analyzed. Furthermore, the methods of improving the bit error performance of MPPM were studied. The simulation results show that 16PPM performs better than 16-ary phase shift keying（16PSK） by 2dB at bit error rate of 10-3 over additive white Gaussian noise (AWGN) channels. By optimizing the parameters of phases at transmitter, 16PPM is superior to 16-ary quadrature amplitude modulation（16QAM） over Rayleigh flat-fading channels. MPPM can greatly improve the transmitting data rate and bandwidth efficiency, which can be utilized for the future mobile communication.

Key words: multilevel parallel phase modulation, bandwidth efficiency, asymmetric constellation