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Error exponent
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Error exponent : ウィキペディア英語版
Error exponent

In information theory, the error exponent of a channel code or source code over the block length of the code is the logarithm of the error probability. For example, if the probability of error of a decoder drops as ''e''−''n''α, where ''n'' is the block length, the error exponent is α. Many of the information-theoretic theorems are of asymptotic nature, for example, the channel coding theorem states that for any rate less than the channel capacity, the probability of the error of the channel code can be made to go to zero as the block length goes to infinity. In practical situations, there are limitations to the delay of the communication and the block length must be finite. Therefore it is important to study how the probability of error drops as the block length go to infinity.
== Error exponent in channel coding ==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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