MPPSK调制的跳时多址研究

研究了一种MPPSK调制的跳时多址实现方法。发送端对时域连续的正弦载波进行调制，根据用户唯一分配的跳时图案及待发送的符号，在相应的时隙产生相位跳变，非跳变处都是正弦波；接收端将信号通过冲击滤波，依据传输时延及跳时图案获得相应时隙的包络值，进行检测判决。通过仿真，对比了相同调制参数下跳时多址MPPSK与非跳时MPPSK的误码性能。结果表明:在各用户跳时图案正交的情况下，跳时调制的MPPSK信号并未损失误码性能，验证了此种跳时多址实现方法的可行性和有效性。 

Research on Time-hopping Multiple-access of MPPSK Modulation

In order to realize multiple-access communication of M-ary Position Phase Shift Keying (MPPSK) modulation, a realization method was researched based on time-hopping. The sending signal was modulated on a continuous sine wave, of which the phase jumped in corresponding time slots according to the symbols ready to send and the time-hopping sequence exclusively assigned to one user. The envelope in corresponding time slots was obtained for demodulation according to the transmission delay and the time-hopping sequence after receipt signal passed through the impacting filter. By simulation, the bit error rate (BER) of time-hopping multiple-access MPPSK and that of non-time-hopping MPPSK were compared under the same modulation parameters. The simulation results show that time-hopping modulated MPPSK signals don't lose BER performance when the time-hopping sequences of users are orthogonal, thus the feasibility and effectiveness of this time-hopping multiple-access realization are demonstrated.