摘要
正交振幅调制QAM(Quadrature Amolitude Modulation)是一种频谱利用率很高的调制方式。文章在介绍QAM调制,解调原理的基础上,深入探讨了QAM的频谱利用率和误码率性能,并在System View下对该系统进行了完整仿真。通过仿真观察到调制与解调信号的波形,星座图以及QAM信号功率谱密度曲线,并对仿真结果进行了分析。由分析结果可知,QAM调制系统具有很高的频谱利用率以及较好的误码率性能．因此可增大系统容量,同时也保证了系统的可靠性。
OAM （Ouadrature Amplitude Modulation） is a kind of modulation modes with high utilization ratio of frequency spectrum. Utilization ratio of frequency spectrum and bit error rate （BER） performance is discussed based on principle of OAM modulation and demodulation. The whole OAM system is simulated by SystemView. The modulating wave, Constellation Diagram and power spectrum density curve is observed by simulation. The simulation result shows that OAM can enlarge the system capacity and ensure the system reliability with high utilization ratio of frequency spectrum and low bit error rate.
出处
《信息通信》
2006年第6期28-30,共3页
Information & Communications
关键词
误码率
仿真
星座图
功率谱密度
高频滚降
Bit error rate： Simulation
Constellation Diagram
Power spectral density
High frequency rolloff
