北京理工大学珠海学院 2020 届本科生毕业设计2ASK 传输系统及仿真 (System View)摘 要由于数字基带信号频率十分低,在设计数字通信系统时一般采用带通传输的形式,为了使基带信号能以较高的频率发送给出去,需要对载波进行调制。键控法是数字调制的常用方法之一,根据载波物理参数变化的不同,分为幅移键控(ASK)、频移键控(FSK)、相移键控(PSK)。其中,幅移键控(Amplitude Shift Keying,简称 ASK),又称为振幅键控是一种通过改变载波信号的振幅,利用载波幅度的变化来传递数字信息的调制方法 。2ASK 是一种原理简单的调制方式,具有技术简单、易于实现、但却易受外界噪声干扰的特点,由于该调制方式传输效率较低,故现已较少应用。但是作为了解其他数字调制原理的基础,我们还是应该去了解 2ASK 传输系统的工作原理。在实际应用当中,大型、复杂的系统直接实验是十分昂贵的,而通信系统设计研究是一项十分复杂的技术。由于技术的复杂性,在现代通信技术中,越来越重视采用计算机仿真技术来进行系统分析和设计。利用仿真,可以大大降低实验成本,因此在本设计中利用计算机仿真软件来设计 2ASK 传输系统。关键词:振幅键控;ASK;2ASK;信道噪声;调制解调北京理工大学珠海学院 2020 届本科生毕业设计2ASK transmission system and simulation (System View)AbstractBecause the frequency of digital baseband signal is very low, the form of band-pass transmission is generally used in the design of digital communication system. In order to make baseband signal sent out at a higher frequency, the carrier needs to be modulated. Keying is one of the common methods of digital modulation. It can be divided into amplitude shift keying (ask), frequency shift keying (FSK) and phase shift keying (PSK) according to the different physical parameters of carrier. Among them, amplitude shift keying (ask), also known as amplitude keying, is a modulation method that transmits digital information by changing the amplitude of carrier signal and using the change of carrier amplitude. 2ASK is a simple modulation method, which has the characte...