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 20 of 26 for “"Broadcast Channel"”.
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The multiple access broadcast channel : protocol and capacity considerations.
Microfiche copy available in the Institute Archives and Barker Engineering Library.
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On the effect of redundancy on the multiple access broadcast channel
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1979.
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Power allocation of multi-rate transmissions over a jammed broadcast channel
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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Investigation of coding and equalization for the digital HDTV terrestrial broadcast channel
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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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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Some Information Theoretic Aspects of Reliable Communication With Transmitter Side Information
… multiple-input-multiple-output (MIMO) Gaussian broadcast channel. Our main result is a new extremal inequality as the underpinning mathematical structure for the MIMO Gaussian broadcast channel problem. In one special case, this inequality yields a generalization of the classical vector …
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Throughput and complexity tradeoffs in the multi-antenna downlink
… Gaussian multiple-input multiple-output (MIMO) broadcast channel. It is well known that the use of multiple transmit antennas can greatly increase the capacity of the broadcast channel. However, the complexity of a capacity-achieving strategy is dominated by the underlying search for the best …
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Multi-channel Mobile Access to Web Services
… M-services. We focus on methods for accessing broadcast based M-services from multiple wireless channels. We first discuss efficient access methods in data-oriented wireless broadcast systems. We then discuss how to extend current wireless broadcast systems to support simple M-services. We …
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Transmitter precoding for multi-antenna multi-user communications
… the use of multiple receive antennas. In a broadcast channel, where a central transmitter is transmitting independent streams to decentralized receivers, it is possible for the transmitter to have a priori knowledge of the interference. Multiple antennas can be used at the transmitter to …
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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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Efficient scheduling of multi-antenna broadcast systems
… scheduling users in a multi-antenna Gaussian broadcast channel with 1M transmit antennas and K independent receivers each with a single receive antenna. We first focus on a scenario with two transmit antennas and statistically identical users, and analyze the gap between the full sum capacity …
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Low-complexity approaches to distributed data dissemination
… multiple senders communicate across a common channel to a single receiver. * The deterministic broadcast channel problem where multiple messages are sent from a common sender to multiple receivers through a deterministic medium. Chapter 1 serves as an introduction and provides models, …
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Securing Wireless Broadcast Communications against Internal Attacks
… interference (jamming) attacks against broadcast communications. Such attacks have been shown to be detrimental to network operation. We further consider the problem of distributed node coordination in dynamic spectrum networks. To address these problems, we design novel communication …
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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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Dynamic subframe allocation in a reservation multiple access channel
… a central station or each other over a single broadcast channel. Reservation protocols are a class of multiaccess protocols appropriate for satellite and radio networks. This thesis investigates dynamic time slot access control schemes for reservation multiaccess protocols similar to those …
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Approximation techniques in network information theory
… blocks of a communication network, namely the broadcast channel, the interference channel and the relay channel, have been open problems for several decades. When exact solutions are elusive, progress can be made by seeking for approximate solutions first. The first contribution of the thesis …
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Complexity and second moment of the mathematical theory of communication
… to zero, whether their code rates converge to channel capacity, and whether their growth in complexities stays under control. Over any discrete memoryless channel, I build codes such that: for one, their block error probabilities and code rates scale like random codes’; and for two, their …
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Design and Analysis of Multilevel Coded Modulation for Multi-Node Networks
… two-user additive white Gaussian noise (AWGN) broadcast channel, a multi-level coding architecture is proposed whose performance can approach the entire capacity region, and whose attractive features include a convenient partition of the two users’ data so that one and only one of the …
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Fundamental Impacts Of Delay And Deadline On Communications Over Wireless Networks
… more effective communications schemes is channel state information which is available at the transmitters (CSIT). CSIT is usually provided to the transmitters via feedback channels from the receivers. Timely and accurate CSIT has been shown to provide enormous theoretical gains in terms of …
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Capacity-approaching data transmission in MIMO broadcast channels
… roles of multiple antennas are studied under channel-aware scheduling, including diversity, beamforming and spatial multiplexing. At a system performance level, our work shows that downlink throughput can be optimized by joint precoding across multiple transmit antennas and exploiting …
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