Abstract
In digital communication system, need the input digital sequence map for signal
transmission in the channel, the source output digital sequence, after signal after
mapping become suitable for channel transmission of digital modulation signals, and
at the receiving end corresponding to resume the original signal demodulation. So this
thesis mainly studies the digital signal transmission of the basic concept and the
digital signal transmission transmission process and how to use MATLAB simulation
software to design digital transmission system. The first interface introduced this topic
theoretical basis, including digital communication, digital baseband transmission
system composition and digital signal transmission process. According to the
simulation process and basic steps of the MATLAB simulation tools to implement the
digital baseband transmission system's process, the system is analyzed.
The course is designed to complete the whole system and each link of the whole
system simulation, and finally at the receiving end or similar or accurate reproduction
of the input (source), and the degree of distortion. The whole design process including
analog signal digital, namely PCM coding, Miller, baseband code, using hamming
code, frequency modulation, utilize FSK modulator, through the fading channel, to
the receiving equipment, and demodulation decoding and restore the original signal
process, to test our MATLAB programming knowledge.
Keywords: PCM、Miller-code、Hamming-code、FSK modulation、fading channel
