Advanced Physical Layer Techniques for Wireless Communication Networks - A Factorization Approach

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The research project addresses the potential benefits of Advanced Physical Layer Techniques in wireless communication networks. In the previous part of the project, we analyzed a Network Utility Maximization problem on the basis of Shannon Rate Models for describing error-free information transfer in a network. This led to decomposition approach, referred to as Network Factorization, which is tightly related to Scheduling as the Medium Access Technique of first choice. The proposed approach thus inherently corresponds to an inner approximation of the unknown capacity region of the respective network. In this renewal project we rely on a conceptionally new model based on a different understanding how to model the Wireless Broadcast Advantage in network coded communication networks. The new concept is based on the introduction of abstract Broadcast Functions for describing the information flow from a transmitting node in a network over its outgoing links. It has been shown that an appropriately defined broadcast function and its respective rate region is tightly related with a Polymatroid Formulation known from graph theory. The goal of this renewal project is thus to understand Polymatriod Flow Models for network coded communication systems in its most general conception and to analyze the joint optimization of the information flow, the Medium Access Control mechanism, and the underlying Physical Layer Parameters in a wireless communication network simultaenously based on the suggested polymatroid flow models. In contrast to the first part of the project we extend our focus on Non-Shannon Rate Broadcast Models, Random Access Techniques, and Physical Layer Techniques beyond pure broadcast channels.