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also assumed that one knows the transition matrix for the channel being used.
# A message W is chosen according to the uniform distribution on the set of codewords. That is, .
# The message W is sent across the channel.
# The receiver receives a sequence according to
# Sending these codewords across the channel, we receive , and decode to some source sequence if there exists exactly 1 codeword that is jointly typical with Y. If there are no jointly typical codewords, or if there are more than one, an error is declared.

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