英语论文网

ary data into signal waveforms and transmits it.

The signal is now transmitted through a channel, which serves as an interface between digital modulator and digital demodulator and is also responsible for the addition of noise in the digital data. The channels which are most commonly used are,

Wire line channels
Fiber optic channels
Wireless electromagnetic channels
Underwater acoustic channels
After passing through the channel, the signal is received and is demodulated with the help of a digital demodulator. The digital demodulator scans the corrupted transmitted waveform and reduces each waveform to a single number to represent the transmitted data symbol. With the help of redundancy, which was added in the transmitted data, the decoder corrects the signal from the points where it was corrupted.

From the digital demodulator, the sequence enters the channel decoder and from there, it enters the source decoder and from the knowledge of source encoding technique used before, it starts reconstructing the original signal. The signal at the output of the source decoder is not the original one but is an approximation of the original signal.

Note 注意

The purpose of writing a complete chapter on digital communication system is to explain the reader about the importance of channel coding and source coding in digital communication system.

本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。