Classical Information Theory

نویسنده

  • Robert B. Griffiths
چکیده

⋆ Suppose we have a certain message we want to transmit from location A to location B. What resources are needed to get it from here to there? How long will it take if we have a channel with a capacity of c bits per second? If transmission introduces errors, what do we do about them? These are the sorts of questions which are addressed by information theory as developed by Shannon and his successors. • There are, clearly, N = 2 messages which can be represented by a string of n bits; e.g., 8 messages 000, 001,. . . 111 for n = 3. Hence if we are trying to transmit one of N distinct messages it seems sensible to define the amount of information carried by a single message to be log2 N bits, which we hereafter abbreviate to log N (in contrast to lnN for the natural logarithm).

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تاریخ انتشار 2010