Multihop Analog Network Coding Via Amplify-and-Forward: The High SNR Regime
In the simplest relaying strategy, a network node amplifies and forwards a received signal over a wireless channel. Multi-hop amplify-and-forward allows for a (noisy) linear combination of signals simultaneously sent from multiple sources to be propagated through the network over multiple layers of relays. The performance of multi-hop amplify-and-forward is limited by noise propagated to the destination over multiple hops, and the authors expect this strategy to perform well only in high SNR. In this paper, this intuition is formalized and high-SNR conditions under which multi-hop amplify-and-forward approaches capacity in a layered relay network are determined.