Question

what is a group code

Answer 1

Yo!

Here's your answer,pal!

In coding theory, group codes are a type of code. Group codes consist of linear block codes which are subgroups of, where is a finite Abelian group.

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-TGA.

Answer 2

Group codes are a type of code consisting of linear block codes.  

For example, the [7,4,3] Hamming code is a linear binary code which represents 4-bit messages using 7-bit codewords. Two distinct codewords differ in at least three bits. As a consequence, up to two errors per codeword can be detected while a single error can be corrected.