高阶并行相位调制技术研究

提出了高阶并行相位调制（MPPM）的方法，即在同一调制符号周期,使用同一频率、并行发送2路携带不同信息的高阶相位调制信号。给出了MPPM的系统模型，理论分析了MPPM的调制和解调实现机制，探讨了进一步降低MPPM误码率的方法。仿真结果表明，在加性高斯白噪声（AWGN）信道下，误码率为10-3时，16PPM比16相相移键控（16PSK）可有2 dB的信噪比增益；在Rayleigh平坦衰落信道下，通过优化发送端相位参数，16PPM的性能优于16相正交幅度调制（16QAM）。所以，MPPM能大幅提高无线链路数据传输速率和带宽效率，对未来移动通信具有一定的实用价值。

Multilevel Parallel Phase Modulation Techniques

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.