The Capacity of a Relay Channel, Both With and Without Delay
Edward C. van der Meulen, Peter Vanroose · IEEE Transactions on Information Theory · 2007
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.