Download A Mathematical Theory of Communication by Claude E. Shannon PDF

By Claude E. Shannon

Scientific wisdom grows at a wonderful pace--but few books have had as lasting an influence or performed as very important a job in our glossy international as The Mathematical thought of Communication, released initially as a paper on conversation conception within the Bell approach Technical Journal greater than fifty years in the past. Republished in e-book shape almost immediately thereafter, it has in view that passed through 4 hardcover and 16 paperback printings. it's a innovative paintings, stunning in its foresight and contemporaneity. The collage of Illinois Press is happy and commemorated to factor this commemorative reprinting of a classic.

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Let the tentative evaluation be x y. Then the function x y approaches (as T ! ∞) a constant for almost all x y which are in the high probability region corresponding to the system: ; ; ; ; ; y ! v,Px; y x and we may also write ; y ! ZZ ; x ZZ since ; Px y x y dx dy ; Px y dx dy = 1 : This establishes the desired result. 9 It measures how undesirable it is (according to our fidelity criterion) to receive y when x is transmitted. The general result given above can be restated as follows: Any reasonable evaluation can be represented as an average of a distance function over the set of messages and recovered messages x and y weighted according to the probability Px y of getting the pair in question, provided the duration T of the messages be taken sufficiently large.

Let us suppose that the power is limited to S not at every instant of time, but only at the sample points. The maximum entropy of the transmitted ensemble under these weakened conditions is certainly greater than or equal to that under the original conditions. This altered problem can be solved easily. The maximum entropy p occursp if the different samples are independent and have a distribution function which is constant from , S to + S. The entropy can be calculated as W log4S : The received signal will then have an entropy less than  W log4S + 2 eN 1 + S with !

5; “On Causality Statistics and Probability,” Journal of Mathematics and Physics, v. XIII, No. 1, 1934; N. Wiener, “The Ergodic Theorem,” Duke Mathematical Journal, v. 5, 1939. 33 Just as we may perform various operations on numbers or functions to obtain new numbers or functions, we can perform operations on ensembles to obtain new ensembles. Suppose, for example, we have an ensemble of functions f t  and an operator T which gives for each function f t  a resulting function g t : g t  = T f t  : Probability measure is defined for the set g t  by means of that for the set f t .

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