Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 16 of 16 for “"broadcast channels"”.
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Exact Byzantine consensus under local-broadcast channels
… consensus with Byzantine faults under a local-broadcast communication channel. We prove necessary and sufficient conditions on the underlying communication graph to achieve consensus. We show that under this model consensus is possible on undirected graphs that have $2f+1$ nodes and are …
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Capacity-approaching data transmission in MIMO broadcast channels
… multiple input and multiple output (MIMO) channels. There are three major results in this dissertation. First, it is shown that over a MIMO Gaussian broadcast channel, and under channel-aware scheduling, open-loop transmit antenna diversity actually reduces the achievable sum rate. This …
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Coding and scheduling optimization over packet erasure broadcast channels
… receivers in single hop wireless packet erasure broadcast channels. We capture the delay sensitivities across different types of network applications using a class of delay metrics based on the norms of packet arrival times. With these delay metrics, we establish a unified framework to …
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Multiuser Communications With Relaying and User Cooperation
… networks is investigated. Three two-user relay broadcast channels are studied from an information-theoretic viewpoint. These channels represent fundamental units of downlink systems that exploit relaying and user cooperation. Achievable regions for these channels are derived. Upper bounds on the …
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Euclidean network information theory
… of this approach to the point-to-point channels, general broadcast channels (BC), multiple access channels (MAC) with common sources, interference channels, and multi-hop layered communication networks without or with feedback. It can be shown that with this approach, information theory …
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MIMO Wireless Networks: Modeling and Optimization
… fair (WPF) scheduling associated with MIMO broadcast channels (Chapter 2). For the WPF scheduling problem in MIMO broadcast channels, we develop two algorithms that can efficiently determine the optimal dirty paper encoding order and power allocation to achieve an optimal WPF performance. To …
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Scheduling And Resource Allocation In Wireless Sensor Networks
… disseminating data. Network resources, such as broadcast channels, number of sensors, power, battery life, etc., are limited. Hence, a schedule is required to optimally allocate network resources so as to maximize some profit or minimize some cost. This thesis focuses on scheduling problems in …
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Communication Efficiency: Superposition Strategies and Early Decoding
… superposition coding is capacity-achieving for broadcast channels, practical implementations have not delivered the gains predicted by theory. This work analyzes its achievable performance under both common and unequal reliability requirements, providing insight into its relative …
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Multiple-user quantum information theory for optical communication channels
… capacity theorems for point-to-point bosonic channels with additive thermal noise, under the presumption of a conjecture on the minimum output von Neumann entropy. In the first part of this thesis, we evaluate the optimum capacity for free-space line-of-sight optical communication using …
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Novel Site-Specific Techniques for Predicting Radio Wave Propagation
… However, to optimize the design of a wireless broadcast or a point to multi point system such as a Wireless LAN (WLAN) or a cellular system, propagation characteristics at multiple points in space need to be known. The standard ray tracing algorithms can be notoriously time consuming when used …
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Low Complexity Scheduling in Wireless Networks
… information theory. Informationtheoretic Broadcast Channels (BC) and Multiple Access Channels (MAC) enable asingle node to transmit data simultaneously to multiple nodes, and multiple nodesto transmit data simultaneously to a single node respectively. For wireless networkscontaining nodes …
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Design and analysis of digital watermarking, information embedding, and data hiding systems
… for the problem of communicating over broadcast channels. We also present practical implementations of QIM methods called dither modulation and demonstrate their performance both analytically and through empirical simulations.
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New Method for Directional Modulation Using Beamforming: Applications to Simultaneous Wireless Information and Power Transfer and Increased Secrecy Capacity
… devices, limited spectral resources, and the broadcast nature of wireless communications systems. Communications for these systems must have sufficient information capacity and secrecy capacity while typically maintaining small size, light weight, and minimized power consumption. With …
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Nonparametric Anomaly Detection and Secure Communication
… investigated, for which the focus is on degraded broadcast channels. In such channels, one transmitter sends messages to multiple receivers, the channel quality of which can be ordered. Two specific models are studied. In the first model, layered decoding and layered secrecy are required, i.e., …
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Wireless Throughput and Energy Efficiency under QoS Constraints
… throughput and energy efficiency in fading channels are studied in the presence of randomly arriving data and statistical queueing constraints. In particular, Markovian arrival models including discrete-time Markov, Markov fluid, and Markov-modulated Poisson sources are considered, and …
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MIMO Communication Capacity: Antenna Coupling and Precoding for Incoherent Detection
… capacity of MIMO systems for compact arrays. For channels which do not vary in time, placing antennas closer together generally reduces the system capacity. However, recent work has demonstrated that for a MIMO system operating in a fast fading environment where the transmitter and receiver know …