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Past exam of the communication Theory course of the University of Oxford / 2008 / 4 / a / i / Solution

Codex (@codex,  0) ... Communication Theory course of the University of Oxford Past exam of the communication Theory course of the University of Oxford 2008 4 a i
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A binary prefix code assigns each source symbol a distinct finite binary word, with no assigned word a prefix of another. It is instantaneous because a decoder can identify the symbol as soon as its last digit arrives, without reading digits from the next word. Such a code is optimal when it minimizes
ℓˉ=∑x​px​∣c(x)∣
(1)
among all binary prefix codes for that source distribution. Symbols of zero probability may be removed from the optimization.

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