To improve the performance of digital bandpass transmission systems, many improvements have been made to digital modulators and many new modulators have been proposed. Some of the hardware circuits of these systems can be realized using software which can save design time, shorten design period and raise the design efficiency. The quadrature amplitude shift keying and minimum shift keying in communication systems using System-View software are design and simulated. The results are shown to be correct.%为了提高数字带通传输系统的性能,人们对数字调制系统不断加以改进,提出了多种新的调制体系.这些新型调制解调系统的某些硬件电路可以用软件实现,从而节省设计时间,缩短设计周期,提高设计效率.利用SystemView软件对通信系统中的正交振幅键控和最小频移键控进行了设计和仿真,仿真结果正确.
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