IEEE Transactions on Information Theory vol:53 issue:10 pages:3774-3776
In this correspondence, we point out the incorrectness of an upper bound in van der Meulen (Advances in Applied Probability, vol. 3, no. 1, pp. 120-154, 1971) and report the correct relay capacity for one of the examples given there. We also show that, when viewed as a relay-without- delay channel, the capacity of this channel is strictly larger than its classical relay capacity.