Analog Network Coding in General SNR Regime

• DOI: 10.48550/arxiv.1202.0372
• Publication Date: 2012-01-01
• Authors: Samar Agnihotri; Sidharth Jaggi; Minghua Chen
• Keywords: Linear network coding; Unicast

The problem of maximum rate achievable with analog network coding for a unicast communication over layered wireless relay directed links is considered. A node performing scales and forwards the signals received at its input. Recently this has been considered under two assumptions: (A) each signal to upper bound transmit power constraint, (B) nodes in specific subsets operate high-SNR regime. We establish that assumption (A), general, leads suboptimal end-to-end rate. also characterize performance class symmetric networks without (B). key contribution work lemma states globally optimal set scaling factors maximizes can be computed layer-by-layer. Specifically, rate-optimal layer one sum-rate next layer. This critical insight allows us scenarios beyond those analyzed using existing approaches. illustrate by computing particular network, various scenarios.