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In block codes, parity bits are ___________ to block of messages.

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In block codes, parity bits are ___________ to block of messages.

(a) Added

(b) Subtracted

(c) Multiplied

(d) Divided

The question was asked in an interview.

My doubt is from Block Codes and Finite Fields in division Equalization, Diversity and Channel Coding of Wireless/Mobile

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The correct option is (a) Added

To explain I would say: In block codes, parity bits are added to the block of message bits to make codewords or code blocks. They enable a limited number of errors to be detected and corrected without retransmission.

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