Question
In a digital communication system, let the encoding
scheme be “Add 1 at the end of the bit stream if number of 1 bits is odd, else add 0 at the end of bit stream”. If 1011 is the bit stream, which of the below is the encoded bit stream ?Solution
The given rule is a parity encoding scheme . It says: add 1 at the end if the number of 1’s in the bit stream is odd, otherwise add 0. For the bit stream 1011 , the number of 1’s = 3, which is odd. Therefore, according to the rule, a 1 will be added at the end. The encoded bit stream becomes 10111 . ●     10110 → would be added if the number of 1’s was even. ●     11011 → not following the rule. ●     01011 → not correct transformation.
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