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===Practical definition===
A '''block code''' is the primary type of [[channel coding]] which was used in earlier [[mobile communication]] systems. Simply it adds [[redundancy]] in order that at the receiver, one can decode with (theoretical) probability of
The main characterisation of a block code is that it is a ''fixed length'' channel code (unlike source coding schemes such as [[Huffman coding]], and unlike channel coding methods like [[convolutional code|convolutional encoding]]). Typically, a block code takes a ''k''-digit information word, and transforms this into an ''n''-digit codeword.
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