title: Typical behavior of relays in communication channels.
abstract: The typical behavior of the relay-without-delay channel under low-density parity-check coding and its multiple-unit generalization, termed the relay array, is studied using methods of statistical mechanics. A demodulate-and-forward strategy is analytically solved using the replica symmetric ansatz which is exact in the system studied at Nishimori's temperature. In particular, the typical level of improvement in communication performance by relaying messages is shown in the case of a small and a large number of relay units.
authors.affiliation: Neural Computing Research Group, Aston University, Birmingham, United Kingdom.
authors.forename: R C
authors.initials: RC
authors.lastname: Alamino
authors.forename: D
authors.initials: D
authors.lastname: Saad