2ASK传输系统及仿真(SystemView)

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-passtransmission is generally used in the design of digital communication system.In order tomake 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 amplitudeshift keying (ask),frequency shift keying (FSK)and phase shift keying (PSK)according tothe different physical parameters of carrier.Among them,amplitude shift keying (ask),alsoknown as amplitude keying,is a modulation method that transmits digital information bychanging the amplitude of carrier signal and using the change of carrier amplitude.2ASK is asimple modulation method,which has the characteristics of simple technology,easyimplementation,but easy to be interfered by external noise.Because of its low transmissionefficiency,it has been less used.However,as the basis of understanding other digitalmodulation principles,we should still understand the working principle of 2ASK transmissionsystem.In practical application,large and complex system direct experiment is very expensive,and communication system design and research is a very complex technology.Due to thecomplexity of technology,in modern communication technology,more and more attention ispaid to the use of computer simulation technology for system analysis and design.Usingsimulation can greatly reduce the cost of experiment,so in this design,the computersimulation software is used to design the 2ASK transmission system.Keywords:Amplitude shift keying:ASK:2ASK:channel noise:modulation anddemodulation