A coordinate system for Gaussian Networks
This paper studies network information theory problems where the external noise is Gaussian distributed. In particular, the Gaussian broadcast channel with coherent fading and the Gaussian interference channel are investigated. It is shown that in these problems, non-Gaussian code ensembles can achieve higher rates than the Gaussian ones. It is also shown that the strong Shamai-Laroia conjecture on the Gaussian ISI channel does not hold. In order to analyze non-Gaussian code ensembles over Gaussian networks, a geometrical tool using the Hermite polynomials is proposed. This tool provides a coordinate system to analyze a class of non-Gaussian input distributions that are invariant over Gaussian networks.
Keywords: Broadcast channel ; Gaussian channels ; Hermite polynomials ; information geometry ; interference ; network information theory ; Intersymbol Interference ; Information Rates ; Channel ; Entropy ; Monotonicity ; Capacity ; Bounds
Record created on 2010-09-09, modified on 2016-08-08