ABSTRACT
Driven by the high-speed revolution of new technology, the information highway
construction and global network development, communication technology has rapidly
developed. Carrier communication, satellite communications and mobile communication
technology are also developed in digital, intelligent, broadband way. The technology of
information digital conversion became mature which can create a better circumstance for
information products manufacturing an information service.
As the development of the communication technology, communication system design
also will be more and more complicated, the use of computer software of the simulation,
can greatly reduce the cost in the process of communication. Fortunately, the product
produced by the company of MathWorks provides the software resource for the computer
simulation of wireless communication system, MATLAB is the abbreviation of Matrix
Laboratory, except for its excellent ability of numerical calculation, it also provides the
functions of professional symbolic computation, visual modeling and simulation, real-time
control and so on. Simulink is a simulation tool of the software MATLAB, it is a software package
to modeling, simulate and analysis the dynamical system, it supports continuous system, discrete system
or the mix of the two, the system can be linear or nonlinear. At the same time, it also supports the
simulation system with different sampling frequency.
This text analyses the modulation and demodulation of 2ASK signal, 2FSK signal, 2PSK
signal, QPSK signal, OQPSK signal, MSK signal, 16QAM signal and 64QAM signal in
detail, and use Simulink to simulate the modulation and demodulation principle of various
signal, then obtain the oscillograms of different stage in modulation and demodulation, thus we can
understand the principle of different modulation and demodulation ways deeply.
【 Key words 】 wireless communication digital modulation digital demodulation
Simulink simulation
