embracing-interference-in-wireless-systems

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Embracing Interference In Wireless Systems

Author : Shyamnath Gollakota
ISBN : 9781627054768
Genre : Computers
File Size : 57. 26 MB
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The wireless medium is a shared resource. If nearby devices transmit at the same time, their signals interfere, resulting in a collision. In traditional networks, collisions cause the loss of the transmitted information. For this reason, wireless networks have been designed with the assumption that interference is intrinsically harmful and must be avoided. This book, a revised version of the author's award-winning Ph.D. dissertation, takes an alternate approach: Instead of viewing interference as an inherently counterproductive phenomenon that should to be avoided, we design practical systems that transform interference into a harmless, and even a beneficial phenomenon. To achieve this goal, we consider how wireless signals interact when they interfere, and use this understanding in our system designs. Specifically, when interference occurs, the signals get mixed on the wireless medium. By understanding the parameters of this mixing, we can invert the mixing and decode the interfered packets; thus, making interference harmless. Furthermore, we can control this mixing process to create strategic interference that allow decodability at a particular receiver of interest, but prevent decodability at unintended receivers and adversaries. Hence, we can transform interference into a beneficial phenomenon that provides security. Building on this approach, we make four main contributions: We present the first WiFi receiver that can successfully reconstruct the transmitted information in the presence of packet collisions. Next, we introduce a WiFi receiver design that can decode in the presence of high-power cross-technology interference from devices like baby monitors, cordless phones, microwave ovens, or even unknown technologies. We then show how we can harness interference to improve security. In particular, we develop the first system that secures an insecure medical implant without any modification to the implant itself. Finally, we present a solution that establishes secure connections between any two WiFi devices, without having users enter passwords or use pre-shared secret keys.

Computational Prediction Of Protein Complexes From Protein Interaction Networks

Author : Sriganesh Srihari
ISBN : 9781970001532
Genre : Science
File Size : 51. 22 MB
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Complexes of physically interacting proteins constitute fundamental functional units that drive almost all biological processes within cells. A faithful reconstruction of the entire set of protein complexes (the "complexosome") is therefore important not only to understand the composition of complexes but also the higher level functional organization within cells. Advances over the last several years, particularly through the use of high-throughput proteomics techniques, have made it possible to map substantial fractions of protein interactions (the "interactomes") from model organisms including Arabidopsis thaliana (a flowering plant), Caenorhabditis elegans (a nematode), Drosophila melanogaster (fruit fly), and Saccharomyces cerevisiae (budding yeast). These interaction datasets have enabled systematic inquiry into the identification and study of protein complexes from organisms. Computational methods have played a significant role in this context, by contributing accurate, efficient, and exhaustive ways to analyze the enormous amounts of data. These methods have helped to compensate for some of the limitations in experimental datasets including the presence of biological and technical noise and the relative paucity of credible interactions. In this book, we systematically walk through computational methods devised to date (approximately between 2000 and 2016) for identifying protein complexes from the network of protein interactions (the protein-protein interaction (PPI) network). We present a detailed taxonomy of these methods, and comprehensively evaluate them for protein complex identification across a variety of scenarios including the absence of many true interactions and the presence of false-positive interactions (noise) in PPI networks. Based on this evaluation, we highlight challenges faced by the methods, for instance in identifying sparse, sub-, or small complexes and in discerning overlapping complexes, and reveal how a combination of strategies is necessary to accurately reconstruct the entire complexosome.

Shared Memory Parallelism Can Be Simple Fast And Scalable

Author : Julian Shun
ISBN : 9781970001891
Genre : Computers
File Size : 79. 90 MB
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Parallelism is the key to achieving high performance in computing. However, writing efficient and scalable parallel programs is notoriously difficult, and often requires significant expertise. To address this challenge, it is crucial to provide programmers with high-level tools to enable them to develop solutions easily, and at the same time emphasize the theoretical and practical aspects of algorithm design to allow the solutions developed to run efficiently under many different settings. This thesis addresses this challenge using a three-pronged approach consisting of the design of shared-memory programming techniques, frameworks, and algorithms for important problems in computing. The thesis provides evidence that with appropriate programming techniques, frameworks, and algorithms, shared-memory programs can be simple, fast, and scalable, both in theory and in practice. The results developed in this thesis serve to ease the transition into the multicore era. The first part of this thesis introduces tools and techniques for deterministic parallel programming, including means for encapsulating nondeterminism via powerful commutative building blocks, as well as a novel framework for executing sequential iterative loops in parallel, which lead to deterministic parallel algorithms that are efficient both in theory and in practice. The second part of this thesis introduces Ligra, the first high-level shared memory framework for parallel graph traversal algorithms. The framework allows programmers to express graph traversal algorithms using very short and concise code, delivers performance competitive with that of highly-optimized code, and is up to orders of magnitude faster than existing systems designed for distributed memory. This part of the thesis also introduces Ligra+, which extends Ligra with graph compression techniques to reduce space usage and improve parallel performance at the same time, and is also the first graph processing system to support in-memory graph compression. The third and fourth parts of this thesis bridge the gap between theory and practice in parallel algorithm design by introducing the first algorithms for a variety of important problems on graphs and strings that are efficient both in theory and in practice. For example, the thesis develops the first linear-work and polylogarithmic-depth algorithms for suffix tree construction and graph connectivity that are also practical, as well as a work-efficient, polylogarithmic-depth, and cache-efficient shared-memory algorithm for triangle computations that achieves a 2–5x speedup over the best existing algorithms on 40 cores. This is a revised version of the thesis that won the 2015 ACM Doctoral Dissertation Award.

The Capacity Of Wireless Ad Hoc Networks

Author : Zheng Wang
ISBN : UCAL:X84347
Genre :
File Size : 69. 42 MB
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Third Generation Wireless Systems Post Shannon Signal Architectures

Author : George M. Calhoun
ISBN : 1580535836
Genre : Electronic books
File Size : 56. 34 MB
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Get the fundamental concepts, latest design techniques, and the most advanced architectures for tackling critical wireless communication problems such as capacity, error correction, and channel interference with this new book. It provides you with concepts that include signal interference avoidance and management as part of the design, and other forms of signal hardening -- such as error correction, advanced coding, and convolution -- and signal-shaping techniques -- such as source coding, baseband signal shaping, adaptive air interfaces, RF signal shaping, and smart antenna technologies.

Journal Of Communications And Networks

Author :
ISBN : UCSD:31822036928745
Genre : Computer networks
File Size : 47. 70 MB
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A Robust And Ultra Bandwidth Efficient Transceiver For Interference Environment

Author : Gary Lang Do
ISBN : UCAL:X58310
Genre :
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Pc Magazine

Author :
ISBN : UCSD:31822022826168
Genre : IBM microcomputers
File Size : 66. 52 MB
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United States Compiled Statutes Annotated 1916

Author : United States
ISBN : STANFORD:36105063033570
Genre : Law
File Size : 78. 16 MB
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United States Compiled Statutes 1916

Author : United States
ISBN : MINN:31951D02409456V
Genre : Law
File Size : 68. 29 MB
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American Telegraphy And Encyclopedia Of The Telegraph Systems Apparatus Operation

Author : William Maver (jr.)
ISBN : WISC:89088894878
Genre : Telegraph
File Size : 30. 9 MB
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Wireless Telegraphy And Telephony Simply Explained

Author : Alfred Powell Morgan
ISBN : UCAL:$B293670
Genre : Radio
File Size : 67. 8 MB
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Resource Allocation And Performance Analysis For Next Generation Wireless Communication And Radio Astronomy Systems

Author : Dong Han
ISBN : OCLC:1193993671
Genre : Radio astronomy
File Size : 53. 22 MB
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Radio spectrum is a limited resource for both scientific research and wireless communications industry. The usage of spectrum can be either active, e.g., wireless data transmission and radar detection, or passive, e.g., radio astronomy observation. However, with the rapid growth of active communication and passive signal receiving demand, more efficient and flexible utilization of spectrum is vital. On the other hand, achieving a high power efficiency is also important to signal transmission and detection. This dissertation devotes to developing machine-type communication systems and distributed radio astronomy systems with limited spectrum and power resources. For a radio resource limited multi-tier Machine-type Communication (MTC) network, controlling random access congestion while satisfying the unique requirements of each tier and guaranteeing fairness among nodes is always a challenge. In the first part, we study the network dimensioning and radio resource partitioning for the uplink of an MTC network with signal-to-interference ratio (SIR)-based clustering and relaying, where MTC gateways (MTCGs) capture and forward the packets sent from MTC devices (MTCDs) to the base station (BS). Specifically, under transmission outage probability constraints, we investigate the tradeoff between network utility (in terms of transmission capacity and revenue) and resource allocation fairness. With both outage probability constraints and minimum MTCD density constraints, we propose approaches to maximize the weighted sum of quality of experience (QoE) of different tiers of MTCDs. Furthermore, a transmit power control strategy for MTCG-to-BS link is proposed to achieve a constant data rate. In the second part of this dissertation, we consider a new large-scale communication scheme where randomly distributed backscatter nodes are involved as secondary users to primary transmitter and primary receiver pairs. The secondary communication between a backscatter transmitter and a backscatter receiver introduces additional double fading channels and has a two-side effect to the primary communications. We derive the signal-to-interferenceplus-noise ratio and signal-to-interference ratio based coverage probabilities for two network configuration scenarios, which can provide useful insights in designing such systems. A conflict of the spectrum rights and needs between active wireless communication systems and passive radio astronomy systems (RASs) has become substantially greater due to the phenomenal expansion of wireless communications and increased interest in RAS observation. For sustainable growth and coexistence of cellular wireless communications (CWC) and RAS, a coordinated shared spectrum access paradigm was recently introduced. Embracing such a paradigm, the third part of this dissertation proposes a distributed auxiliary radio telescope (DART) system which can geographically and spectrally coexist with CWC while offering additional capability or performance enhancement to RAS. Theoretical performance analysis of the DART system with different quantization resolutions is presented, and approximate closed-form expressions are obtained. Adaptation of the cooling power of DART receivers according to the time-varying ambient temperature is also proposed. Furthermore, an analytical expression for the DART system parameters under the shared spectrum access paradigm and cooling power constraint to achieve the same performance as the existing single-dish RAS with a radio quiet zone is developed to provide guidance in the DART sysvii tem design. The numerical and simulation results illustrate the feasibility and potentials of the proposed DART system.

Commonwealth Of Australia Gazette

Author : Australia
ISBN : SRLF:D0002965929
Genre : Australia
File Size : 46. 85 MB
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Wireless World

Author :
ISBN : UOM:39015011165035
Genre : Electronics
File Size : 34. 78 MB
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Quick Discovery Of Mobile Devices

Author : Altug Karakurt
ISBN : OCLC:1110705952
Genre : Radio frequency identification systems
File Size : 29. 22 MB
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We consider the problem of detecting the active wireless stations among a very large population. This problem is highly relevant in applications involving passive and active RFID tags and dense IoT settings. In this paper, we consider statistical activation models and formulate a general framework for investigating the limits of multi-station detection problem. We then evaluate the basic limits of achievable delay under two major activation models for Gaussian MAC channel and propose an order-optimal detection scheme in terms of detection delay. In contrast to a collisionavoiding and collision-resolving strategy for sequential detection, our scheme performs a interference-embracing strategy for simultaneous detection. More specifically, we assign each station a signature sequence, picked at random from a specific alphabet and have all active stations transmit their signatures simultaneously upon activation. The challenge at the detector is to detect all active stations from the combined signature signal with low probability of misdetection and false positives. We show that, such an interference embracing approach can substantially reduce the detection delay, at a vanishing probability of both types of detection errors, as the number of stations scale. We compare this paradigm with commonly-used interference avoiding (e.g., CSMA-based) approaches, which are designed to identify one station at a time. We show that interference avoiding approaches suffer from a reduction in delay scaling, even under highly optimistic situations. Finally, we discuss large-scale implementation issues such as the design of low-complexity detection schemes and present numerical investigations.

U S Compiled Statutes 1918

Author : United States
ISBN : UOM:39015074203863
Genre : Law
File Size : 79. 70 MB
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Base Station 44 Success Secrets 44 Most Asked Questions On Base Station What You Need To Know

Author : Theresa Waller
ISBN : 1488863482
Genre :
File Size : 20. 67 MB
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Best Base Station Guide to date. The expression 'base station' is applied in the setting of portable telecom, wireless computer networking and different wireless information exchanges and in terra firma surveying: in surveying it is a GPS recipient at a recognized placing, when in wireless information exchanges it is a transceiver linking a numeral of different implements to one one other either-or to a broader zone. There has never been a Base Station Guide like this. It contains 44 answers, much more than you can imagine; comprehensive answers and extensive details and references, with insights that have never before been offered in print. Get the information you need--fast! This all-embracing guide offers a thorough view of key knowledge and detailed insight. This Guide introduces what you want to know about Base Station. A quick look inside of some of the subjects covered: Access point base station - Standardised architectures, Base station subsystem - BSS interfaces, Improved Mobile Telephone Service - Base station, Radio Base Station, Global System for Mobile Communications - Base station subsystem, Radio Base Station - RBS6000 Technical information, Cellular base station - Emissions issues, Bouygues Telecom - High Court ruling to remove base station, Base station - Computer networking, Base station - Amateur and hobbyist use, Radio Base Station - Technical information, Orbital elevator - Base station, Radio Base Station - Technical information access, Electromagnetic interference at 2.4 GHz - Adding base stations, Base station - Emergency power, Base station subsystem - Base transceiver station, Radio Base Station - RBS Operations and Maintenance, Base station subsystem - Packet control unit, AirPort AirPort Extreme Base Station, AirPort AirPort Base Station, Radio Base Station - RBS hardware cards, Access point base station - Interference, Access point base station - Equipment location, and much more...

Advanced Manufacturing Systems Icmse 2011

Author : Dao Guo Yang
ISBN : 9783038135821
Genre : Technology & Engineering
File Size : 22. 21 MB
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This work brings together the latest applications of, and advances in, CAD/CAM/CAE, energy storage and energy development, mining machinery manufacturing, new energy equipment and manufacturing, cloud manufacturing and extreme manufacturing, bio-manufacturing, enterprise informationization, integrated manufacturing systems, quality monitoring and control of manufacturing processes, measurement control technologies and intelligent systems, embedded systems, etc. This broad overview of the latest advances also provides a reference source for researchers in this field.

Dissertation Abstracts International

Author :
ISBN : STANFORD:36105112755744
Genre : Dissertations, Academic
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