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In telecommunications is:

If the code rate is k/n, for every k bits of useful information, the coder generates totally n bits of data, of which n-k are redundant.

See the related link for further information.

For example:

MODULATION CODING RATE

BPSK 1/2

QPSK 1/2

QPSK 3/4

16 QAM 3/4

256 QAM 3/4

256 QAM 5/6

In all cases we have 1 redundant bit.

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