π/4-DQPSK调制与解调在System View中的仿真实现

Simulation of the π/4-DQPSK signal's modulationand demodulation in SystemView

以System View为软件设计平台,在计算机辅助设计思想下,利用其与Matlab的接口功能,方便快捷地实现差分正交相移键控信号———π/4-DQPSK的调制解调,对其频谱特性、动态、静态性能和在高斯噪声信道条件下系统的抗噪声性能做了详细分析.并在相同信道条件下分析比较π/4-DQPSK和QPSK的频谱及抗噪声性能.仿真结果表明,π/4-DQPSK的频谱扩展现象优于QPSK.

The article is mainly devoted to the theory as well as the achievement on the modulation and demodulation of π/4-DQPSK system in the software SystemView. Besides, the article analyses the dynamic and static behaviors of the π/4-DQPSK system as well as the performance against noise under the condition of Gauss noise channel. The comparison is made on the spectrum and anti-noise performance between π/4-DQPSK and QPSKunder the the the channel. The result of simulation shows that the spectrum expanding of π/4-DQPSK is superior to that of the QPSK system.