Titlebook: Information and Coding Theory; Gareth A. Jones,J. Mary Jones Textbook 2000 Springer-Verlag London 2000 Binary Symmetric Channel.Probabilit

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Information and Coding Theory978-1-4471-0361-5Series ISSN 1615-2085 Series E-ISSN 2197-4144

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Entropy,The aim of this chapter is to introduce the entropy function, which measures the amount of information emitted by a source. We shall examine the basic properties of this function, and show how it is related to the average word- lengths of encodings of the source.

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Optimal Codes,cMillan’s inequality, is that we should use sufficiently long code-words. This raises the question of efficiency: if the code-words are too long, then storage may be difficult and transmission may be slow. We therefore need to strike a balance between using words which are long enough to allow effec