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- W2039164018 abstract "This paper is concerned with the transmission of a discrete, independent letter information source over a discrete channel. A distortion function is defined between source output letters and decoder output letters and is used to measure the performance of the system for each transmission. The coding block length is introduced as a variable and its influence upon the minimum attainable transmission distortion is investigated. The lower bound to transmission distortion is found to converge to the distortion level d <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</inf> (C is the channel capacity) algebraically as a/n. The nonnegative coefficient a is a function of both the source and channel statistics, which are interrelated in such a way as to suggest the utility of this coefficient as a measure of “mismatch” between source and channel, the larger the mismatch the slower the approach of the lower bound to the asymptote d <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</inf> . For noiseless channels a = ∞ and for this case the lower bound is shown to converge to d <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</inf> as a <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>1</inf> (ln n)/n. For noisy channels the upper bound to transmission distortion is found to converge to the asymptote d <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</inf> algebraically as b[(ln n)/n] <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>1/2</sup> . For noiseless channels, the upper bound converges to d <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</inf> as a <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>1</inf> (ln n)/n." @default.
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- W2039164018 date "1968-07-08" @default.
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- W2039164018 title "The Transmission Distortion of a Source as a Function of the Encoding Block Length*" @default.
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- W2039164018 doi "https://doi.org/10.1002/j.1538-7305.1968.tb00065.x" @default.
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