An entropy inequality for q-ary random variables and its application to channel polarization

Details An entropy inequality for q-ary random variables and its application to channel polarization An entropy inequality for q-ary random variables and its application to channel polarization

2010-06-10

arxiv.org/abs/1006.2006v1

Computer Science

Information Theory

To be presented at the IEEE 2010 International Symposium on Information Theory

Scientific paper

It is shown that given two copies of a q-ary input channel $W$, where q is
prime, it is possible to create two channels $W^-$ and $W^+$ whose symmetric
capacities satisfy $I(W^-)\le I(W)\le I(W^+)$, where the inequalities are
strict except in trivial cases. This leads to a simple proof of channel
polarization in the q-ary case.

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