Binary Convolutional Codes
Convolutional codes were first introduced by Elias. in 1955. Later Viterbi developed an algorithm for maximum likelihood decoding scheme, called Viterbi scheme which is called now as convolutional codes.
In convolutional codes, the message comprises of data streams of arbitrary length and a sequence of output bits are generated by the sliding application of Boolean functions to the received data.
In block codes, the data divided into blocks of a equal length but convolutional codes, data bits are not divided into block but the full data fed into the media. A logic function is used by encoder. Another difference is in block code data output depends on present input but in convolution codes, output data depends not only the present input bits but also only previous input bits stored in memory
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