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 Description: The message into electrical signals. Source can be divided into analog source and digital source. Distinguish between analog and digital signals yardstick is to look at its value is continuous or discrete, rather than of time. Source code: The main source is the use of the statistical properties to address the source of the relevance, to remove redundant information source to enhance effectiveness of the system purpose. Channel coding: to ensure the transmission reliability of communication systems to overcome the channel noise and interference. Modulation: Its main purpose is to make the signal characteristics and encoded
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复件 通信06-1班05号李标.doc.doc
通信06-1班05号李标.doc.doc
    

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