Abstract—We investigate achievable degrees of freedom (DoF) for a multiple-input multiple-output (MIMO) multiway relay channel (mRC) with L clusters andK users per cluster. Each user is equipped with M antennas and the relay with N antennas. We assume a new data exchange model, termed clustered

2010 to my wife, Joyce, and my family...- Résumé-

Digitising statistics handling through

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Breaking inside the black box: towards a dynamic evaluation framework for regional innovative capability

are client-server based, which is feasible for relatively slow role-playing games. Those have modest bandwidth and latency requirements and are paid for by their customers. For MMOGs with higher realtime requirements and/or a smaller number of customers willing to pay, peer-to-peer networking seems to be a

Abstract not found

Messaging is a basic service in sensornets. Yet the unique system and application prop-erties of sensornets pose substantial challenges for the messaging design: Firstly, dynamic wireless links, constrained resources, and application diversity challenge the architecture and protocol design of sensornet messaging; Secondly, complex faults and large system scale introduce new challenges to the design of fault-tolerant protocols. The objective of this dissertation is to address the aforementioned challenges of sensornet messaging. Despite the extensive effort in studying sensornet messaging, the lack of a basic un-derstanding of its essential components has been an obstacle for reliable, efcient, and reusable messaging services in sensornets. To address this problem, one task of this dis-sertation is to identify the basic components of sensornet messaging and to study the re-lated algorithmic design issues. More specically, we propose the messaging architecture SMA that consists of three components: trafc-adaptive link estimation and routing (TLR), application-adaptive structuring (AST), and application-adaptive scheduling (ASC). TLR deals with dynamic wireless links as well as the impact of application trafc patterns on

Prüfungsbehörde vorgelegen. Darmstadt, den 30th March 2011 Massively multiplayer online games (MMOGs) are very popular nowadays, but mostly still are implemented in a client-server based approach. This thesis is part of a study on the question: Are peer-to-peer networks suitable for real time applications like

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