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.
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Showing 1 to 20 of 22 for “"Half duplex"”.
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Interference channels with half-duplex source cooperation
The performance gain of allowing half-duplex source cooperation is studied for Gaussian interference channels. The source cooperation is in-band, meaning that each source can listen to the other source's transmission, but there is no independent channel between the sources; half-duplex assumes …
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Full-Duplex Infrastructure Nodes: Achieving Long Range with Half-duplex Mobiles
… inefficiency in today's wireless networks is the half-duplex constraint - the assumption that nodes cannot transmit and receive simultaneously in the same band. The reason for this constraint and the hurdle to full-duplex operation is self-interference: a node's transmit signal appears at its own …
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Alibi framework for identifying insider jamming attacks in half-duplex wireless local area networks
… to this problem is unique: we exploit the half-duplex nature of the attackers. Specifically, a half-duplex jammer has the following characteristics: - It cannot send on two different channels simultaneously due to a non-negligible channel switching time. - It cannot receive on two different …
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Wireless communication and localization systems under spatial and temporal channel variations
… new link-layer protocols for rateless codes on half-duplex additive white Gaussian noise channels; a new abstraction for short-range mobile-to-mobile and mobile-to-infrastructure "room-area" networks that adhere to the spatial boundaries of human conversation; a reduced-complexity tone …
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Wireless Full-Duplex: From Practice to Theory
Full-duplex is the ability of a node to transmit and receive simultaneously in the same band. Ideal wireless full-duplex communication can double the spectral efficiency compared to the traditional half-duplex communication. In this dissertation, we study the challenges in realizing full-duplex …
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Optimal Routing and Power Allocation for Wireless Networks with Imperfect Full-Duplex Nodes
We study a wireless full-duplex network with imperfect interference cancellation and solve the routing and power allocation problem in this network. We use a model that focuses on the effects of full-duplex by including residual self-interference and one hop interference while other interfering …
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Fully Integrated Data and Power Transfer Systems with Galvanic Isolation
… on a fully integrated dc-dc power converter with half-duplex data communications providing on chip galvanic isolation in silicon technologies. This research is mainly interested in increasing the level of integration for the next generation of power converters with data transfer and several other …
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Applying Universal Verification Methodology on a Universal Asynchronous Receiver/ Transmitter design
… ways: simplex (in one direction only), full duplex (both devices can receive and send data simultaneously) and half duplex (both devices can take turns to receive and transmit data). The structure of the data frame contains a single start bit, followed by next five to nine bits, depends on …
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COOPERATIVE COMMUNICATIONS FOR LTE-ADVANCED SYSTEMS: DOWNLINK RELAY AND PERFORMANCE OPTIMIZATION
… proposes and analyzes the performance of several half-duplex downlink relay schemes in interference-limited cellular systems. These schemes are – The Omni-Relay (OR) scheme, The Directional-Relay (DR) scheme and The In-band Relay (IR) scheme. The average signal-to-interference plus noise ratio and …
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Convivo communicator : an interface-adaptive voice over IP system for poor quality networks
… of three voice communication modalities (full duplex, half duplex, and voice messaging). The thesis proposes that changes in communication modality are an option to sustain voice communication interaction despite poor network performance. The goals of the changes in communication modality are …
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An energy-efficient wireless data link for implantable electronics
… biomedical implants. A prototype bi-directional, half-duplex wireless link based on inductive coupling was designed in a 0.18 [mu]m process. The uplink (i.e. data transmission from the internal transceiver) was designed to use an impedance modulation strategy. Since this technique only requires a …
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Wireless Throughput and Energy Efficiency under QoS Constraints
… slope regions. Furthermore, transmission over a half-duplex relay channel with secrecy and QoS constraints is studied. Secrecy throughput is derived for the half duplex two-hop fading relay system operating in the presence of an eavesdropper. Fundamental limits on the energy efficiency of …
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Network coding for delay challenged environments
… in delay, throughput or energy efficiency, 2) half-duplex constraints on the nodes, which precludes a node to receive and transmit at the same time, and/or 3) application-level requirements for reliable, fast and efficient dissemination of information. We consider three main problems of study …
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Magnetless circulators based on linear time-varying circuits
… resources becomes crucial. For this reason, full‐duplex communication, which doubles the transmission rate over a certain bandwidth compared to currently deployed half-duplex radios by operating the uplink and the downlink simultaneously on the same frequency, has been brought back into the …
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Extending the Flexibility of an RFIC Transceiver Through Modifications to the External Circuit
… circuit for the RF29X5 family of low cost, half duplex, FM/AM/ASK/FSK RFIC transceivers originally intended for operation in the 433, 868, or 902-928 MHz industrial, scientific, and measurement (ISM) bands. Examinations of the operating principles of the transceiver components were performed …
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Study of Techniques For Reliable Data Transmission In Wireless Sensor Networks
… topology, (ii) nodes are equipped with half-duplex radios, implying that they cannot transmit and receive simultaneously, (iii) nodes transmit their traffic at the same average rate. We compute the average data rate corresponding to each proposed strategy. Next, we take an …
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Interference management in wireless networks
… (MBs), small-cell basestations (SBs) that act as half-duplex analog relays, and mobile terminals (MTs). The first layer is a wireless back- haul layer between MBs and SBs, and the second layer is the transmission layer between SBs and MTs. The two layers use the same time/frequency resources for …
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Energy aware network coding in wireless networks
… to a single sink through the aid of a half-duplex relay. The fluid flow model is used to describe the case where both the source and the relay are coding, and Markov chain models are proposed to describe packet evolution if only the source or only the relay is coding. Although we do not …
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Delay QoS Provisioning and Optimal Resource Allocation for Wireless Networks
… of cooperative networks, the performance of both half-duplex and full-duplex operations is studied for the two-way multiple input multiple output (MIMO) system under QoS constraints. In full-duplex mode, the self-interference inflicted on the reception of a user due to simultaneous transmissions …
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Improving the Capacity in Wireless Ad Hoc Networks through Multiple Channel Operation: Design Principles and Protocols
… results show that even with only a single half-duplex transceiver, MC-MAC, by exploiting multiple channels, can offer up to a factor of four improvement in throughput over the IEEE 802.11 MAC protocol. The reduction in delay is even more significant. Therefore, the MC-MAC protocol and the …
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