Download or read book Smart Radio Interference Mitigation Techniques for Mutual Coexistence written by Siddharth Shetty and published by LAP Lambert Academic Publishing. This book was released on 2011-09 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Thesis focuses on an interference mitigation technique called Detect And Avoid (DAA), a terminology that was made popular by Ultrawideband technology. This report specifically addresses design and implementation challenges associated with DAA in the context of coexistence between UWB and WiMAX technologies. However the design problems, implementation issues and candidate solutions discussed herein are generic enough to be applicable to other radio architectures that use similar core building blocks, particularly for digital radio implementations that contain Fast Fourier Transform (FFT) engines. Another important aspect highlighted in this report is the impact of non-technical considerations such as regulatory requirements and cost implications on choice of certain approaches over others. Such considerations can be decisive from a hardware design perspective especially in low-cost, low-power consumer electronics market.

Download or read book Interference Mitigation Techniques to Support Coexistence of Ultra WideBand Systems written by Abdur Rahim and published by Jörg Vogt Verlag. This book was released on 2010 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cognitive Radio Techniques written by Kandeepan Sithamparanathan and published by Artech House. This book was released on 2012 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing an in-depth treatment of the core enablers of cognitive radio technology, this unique book places emphasis on critical areas that have not been sufficiently covered in existing literature. You find expert guidance in the key enablers with respect to communications and signal processing. The book presents fundamentals, basic solutions, detailed discussions of important enabler issues, and advanced algorithms to save you time with your projects in the field. For the first time in any book, you find an adequately detailed treatment of spectrum sensing that covers nearly every aspect of the subject. Moreover, this valuable resource provides you with thorough working knowledge of localization and interference mitigation as enablers of cognitive radio technology. The book includes all the necessary mathematics, statistical and probabilistic treatments, and performance analysis to give you a comprehensive understanding of the material.

Download or read book Interference Mitigation and Resource Allocation in Underlay Cognitive Radio Networks written by Shailesh Digambar Chaudhari and published by . This book was released on 2018 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to ever increasing usage of wireless devices and data hungry applications, it has become necessary to improve the spectral efficiency of existing wireless networks. One way of improving spectral efficiency is to share the spectrum amongst different coexisting networks and serve multiple devices simultaneously. Spectrum sharing mechanisms for coexistence of a licensed network, such as LTE, with an unlicensed network, such as Wi-Fi, are being considered in the recent literature and standardizations. In order to enable the coexistence between licensed and unlicensed users, it is necessary to include interference mitigation techniques to protect the licensed primary users (PUs) from harmful interference. Typical interference mitigation mechanisms are based on spectrum sensing and cognitive radio (CR), wherein unlicensed secondary users (SUs) observe the spectrum and utilize it when licensed PUs are inactive. Thus, the SUs utilize empty time-slots in the shared spectrum to avoid the interference. The spectral efficiency can be further improved if the SUs are allowed to transmit concurrently with PUs by exploiting the spatial dimension provided by multiple antenna techniques. The underlay CR paradigm allows such coexistence where SUs transmit its signal in the same time-slots as PUs by exploiting the spatial and frequency resources in the network. In order to exploit the spatial dimension, SUs can utilize the location coordinates of PUs to steer its signal away from PUs to mitigate the interference. The SU transmitter can also employ multiple antenna techniques to serve a large number of devices. Further, the SUs can utilize frequency bands occupied by PUs by dynamically selecting the frequency band that provides the highest rate. In this work, we develop techniques for PU location estimation, spatial resource allocation and frequency band selection for SUs in underlay CR networks. We begin by considering the problem of estimation of PU location coordinates in a network of SUs in the presence of spectrally overlapped interference. A localization algorithm based on cyclostationary properties of the PU signal is proposed in order to mitigate the impact of the interference. The proposed scheme identifies and eliminates the SUs in the vicinity of the interferer thereby improving the localization accuracy. Next, we propose a low-complexity algorithm to solve a resource allocation and interference control problem in a network where secondary BS (SBS) is equipped with a large antenna array. The proposed algorithm selects maximum number of SUs and allocates power for downlink transmission from the SBS, while keeping the interference to PUs below a specified limit. It has been shown that the proposed low-complexity algorithm provides optimum solution if the number of antennas at the SBS is order of magnitude larger than the number of SUs and PUs in the network. Finally, we analyze power control and frequency band selection policies for a SU transmitter-receiver pair that can select one out of multiple available frequency band in each time-slot to maximize its achievable rate. We derive an expression for transmit power in a frequency band as a function of interference constraints, PU traffic statistics in the frequency band, and temporal correlation of channels. We show that instead of hopping to a different frequency band in each time-slot, the SU can stay on one frequency band in order to maximize its own rate while keeping the interference toward PUs to a predetermined level.

Download or read book Wireless Body Area Networks written by Jie Dong and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The global trends for dramatic population growth and an ageing society are likely to increase the strain on scarce medical resources in the coming decades. The next generation of personal area networks, Wireless Body Area Networks (BANs), provide a promising solution to this problem with advantages of, e.g. high flexibility, low cost, location independence, real-time monitoring etc... Hence the use of BAN is becoming pervasive. However, the increasing number of active BAN units is a challenge as significant co-channel radio interference is generated, which often causes severe performance degradation and harms system reliability. Because of the difficulty of global coordination amongst multiple, coexisting and uncoordinated, BANs, due to significant dynamics, effective interference management schemes are urgently needed to enable reliable coexistence. Here the main theme is the investigation of the feasibility and efficiency of some co-channel interference mitigation schemes for BANs. The schemes we study in this thesis are based on the following: 1) cooperative communications with relays; 2) transmit power control; and 3) a cross layer design that integrates 1) and 2). Two types of power control methods are investigated: a) the first is a light-weight prediction-based power control method, which adaptively adjusts transmit power, at the sensors and relays, with respect to channel condition variations; b) the second method employs game theory and models the coexistence as a non-cooperative game. These techniques have been studied for other conventional wireless networks in the literature. However, there is very-limited work for radio interference mitigation for BANs. Another main contribution here is, instead of using channel models as presented in the literature, many open-access empirical body-centric channel measurements are used for the investigation of interference mitigation schemes proposed. These measurements contain subjects performing different ̀èveryday'' activities over many hundreds of hours in various environments. The use of the measurements in our study further enhances this by capturing factors that can significantly influence the on-body and inter-body channels. These factors include variations in body shapes and sizes of different subjects, subjects' local and spatial movement, body orientation and the effect of the surrounding environment. The performance, of the proposed schemes, is compared with traditional single-hop star-topology BANs for the same coexisting scenarios and BANs employing other conventional power control methods commonly used in the literature. We analyse their effectiveness with respect to first- and second-order statistics, particularly outage probability, level crossing rate, and average outage/non-outage duration, of the received packets' SINR at the hub of a BAN. The power consumption of using the proposed schemes is also compared with other schemes. Finally, it is shown that employing relays and the proposed power control schemes can greatly enhance a BAN's ability to mitigate co-channel radio interference. The use of a non-cooperative power control game enforces BANs to minimise the interference they create in the coexisting environment while maintaining reliability requirements. Importantly, there is fast convergence to a socially optimum outcome. Overall, there is significant impetus to using the schemes proposed here in future, practical, BAN implementations, as elucidated in this dissertation.

Download or read book Interference Mitigation in Multi Hop Wireless Networks with Advanced Physical Layer Techniques written by Yantian Hou and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In my dissertation, we focus on the wireless network coexistence problem with advanced physical-layer techniques. For the first part, we study the problem of Wireless Body Area Networks (WBAN)s coexisting with cross-technology interference (CTI). WBANs face the RF cross-technology interference (CTI) from non-protocol-compliant wireless devices. Werst experimentally characterize the adverse effect on BAN caused by the CTI sources. Then we formulate a joint routing and power control (JRPC) problem, which aims at minimizing energy consumption while satisfying node reachability and delay constraints. We reformulate our problem into a mixed integer linear programing problem (MILP) and then derive the optimal results. A practical JRPC protocol is then proposed. For the second part, we study the coexistence of heterogeneous multi-hop networks with wireless MIMO. We propose a new paradigm, called cooperative interference mitigation (CIM), which makes it possible for disparate networks to cooperatively mitigate the interference to/from each other to enhance everyone's performance. We establish two tractable models to characterize the CIM behaviors of both networks by using full IC (FIC) and receiver-side IC (RIC) only. We propose two bi-criteria optimization problems aiming at maximizing both networks' throughput, while cooperatively canceling the interference between them based on our two models. In the third and fourth parts, we study the coexistence problem with MIMO from a different point of view: the incentive of cooperation. We propose a novel two-round game framework, based on which we derive two networks' equilibrium strategies and the corresponding closed-form utilities. We then extend our game-theoretical analysis to a general multi-hop case, specifically the coexistence problem between primary network and multi-hop secondary network in the cognitive radio networks domain. In the final part, we study the benefits brought by reconfigurable antennas (RA). We systematically exploit the pattern diversity and fast reconfigurability of RAs to enhance the throughput of MWNs. Werst propose a novel link-layer model that captures the dynamic relations between antenna pattern, link coverage and interference. Based on our model, a throughput optimization framework is proposed by jointly considering pattern selection and link scheduling, which is formulated as a mixed integer non-linear programming problem.

Download or read book Robust Coexistence Methods for Frequency Hopped Wireless Networks written by Jingli Li and published by LAP Lambert Academic Publishing. This book was released on 2009-09 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the upcoming pervasive deployment of wireless networks and devices on the unlicensed band, co- channel interference caused by frequency collisions among coexisting networks have become one of the major performance limiting challenges. In recent years, the coexistence issue has gained increasing attention. However, many collision avoidance schemes are not applicable to multiple frequency hopped networks, mainly due to the fact that the frequency channels of frequency hopped signals are constantly changing and the hop sequence of one network to another is unknown. In this book, a comprehensive framework for co-channel interference mitigation and robust coexistence of multiple frequency hopped networks is developed, multiple novel techniques are introduced, and the system modeling, design, theoretic analysis, simulation, and testbed implementation are presented. This book is useful to professionals and researchers in the wireless communications field. It is also beneficial for engineers seeking new technologies to improve their wireless products' performance and to lead the market.

Download or read book Research on the Key Technologies in Narrowband Interference and Impulsive Noise Mitigation and Cancellation written by Sicong Liu and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes the authors' latest research on narrowband interference and impulsive noise mitigation and cancelation, including (i) mitigating the impacts of NBI on synchronization; (ii) improving time-frequency interleaving performance under NBI and IN; (iii) accurately recovering and eliminating NBI and IN. The complicated, random and intensive narrowband interference and impulsive noise are a serious bottleneck of the next-generation wireless communications and Internet of things. This book also proposes effective and novel frameworks and algorithms, which will significantly improve the capability of mitigating and eliminating NBI and IN in the next-generation broadband communications systems. This book not only presents thorough theoretical models and algorithm design guidelines, but also provides adequate simulation and experimental engineering methods and results. The book is a valuable reference for those engaged in theoretical study, algorithm design and engineering practice in related fields, such as wireless communications, smart lighting, IoT and smart grid communications.

Download or read book Co channel Interference Mitigation for Robust Coexistence of Frequency Hopped Networks written by and published by . This book was released on 2006 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: To meet the military's increased need for rapidly deployable communication solutions, wireless networks are becoming increasingly common within tactical environments. Frequency hopping (FH) is widely used for radio transmission in such networks due to its low probability of detection/interception. With the increasing deployment, multiple networks occupying overlapping frequency bands are likely to coexist in a physical environment, especially in tactical operations, emergency situations, or dense-populated areas. Consequently co-channel interference due to frequency collisions can become a major performance limiting factor. In this project, we developed a novel interference mitigation technique based on multidimensional frequency estimation coupled with the expectation-maximization principle, which effectively resolves collisions among non-collaborative networks, thus enabling robust coexistence of multiple FH networks. To deal with possible receiver-transmitter mismatch, we also designed a low-complexity model order variation detection method. Novel multidimensional frequency estimation algorithms are also investigated.

Download or read book Smart Technologies Systems and Applications written by Fabián R. Narváez and published by Springer Nature. This book was released on 2020-04-30 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes refereed proceedings of the First International Conference on Smart Technologies, Systems and Applications, held in Quito, Ecuador, in December 2019. The 27 full papers and 3 short papers presented were carefully reviewed and selected from 90 submissions. The papers of this volume are organized in topical sections on smart technologies; smart systems; smart trends and applications.

Download or read book Proceedings written by and published by . This book was released on 2002 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Green Information and Communication Systems written by Alagan Anpalagan and published by Academic Press. This book was released on 2012-11-20 with total page 815 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives a comprehensive guide on the fundamental concepts, applications, algorithms, protocols, new trends and challenges, and research results in the area of Green Information and Communications Systems. It is an invaluable resource giving knowledge on the core and specialized issues in the field, making it highly suitable for both the new and experienced researcher in this area. Key Features: Core research topics of green information and communication systems are covered from a network design perspective, giving both theoretical and practical perspectives Provides a unified covering of otherwise disperse selected topics on green computing, information, communication and networking Includes a set of downloadable PowerPoint slides and glossary of terms for each chapter A ‘whose-who’ of international contributors Extensive bibliography for enhancing further knowledge Coverage includes: Smart grid technologies and communications Spectrum management Cognitive and autonomous radio systems Computing and communication architectures Data centres Distributed networking Cloud computing Next generation wireless communication systems 4G access networking Optical core networks Cooperation transmission Security and privacy Core research topics of green information and communication systems are covered from a network design perspective, giving both a theoretical and practical perspective A ‘whose-who’ of international contributors Extensive bibliography for enhancing further knowledge

Download or read book The Evolution of Untethered Communications written by National Research Council and published by National Academies Press. This book was released on 1998-01-01 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: In response to a request from the Defense Advanced Research Projects Agency, the committee studied a range of issues to help identify what strategies the Department of Defense might follow to meet its need for flexible, rapidly deployable communications systems. Taking into account the military's particular requirements for security, interoperability, and other capabilities as well as the extent to which commercial technology development can be expected to support these and related needs, the book recommends systems and component research as well as organizational changes to help the DOD field state-of-the-art, cost-effective untethered communications systems. In addition to advising DARPA on where its investment in information technology for mobile wireless communications systems can have the greatest impact, the book explores the evolution of wireless technology, the often fruitful synergy between commercial and military research and development efforts, and the technical challenges still to be overcome in making the dream of "anytime, anywhere" communications a reality.

Download or read book Smart Grid Infrastructure Networking written by Krzysztof Iniewski and published by McGraw Hill Professional. This book was released on 2013 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describing cutting-edge technologies for connecting the electrical power infrastructure to modern; computerized communications networks; this practical; comprehensive resource offers essential information on standardization; applications; protocols; automation; architecture; and management. --

Download or read book Coexistence of IMT Advanced Systems for Spectrum Sharing with FSS Receivers in C Band and Extended C Band written by Lway Faisal Abdulrazak and published by Springer. This book was released on 2017-12-06 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides information regarding spectrum sharing between wireless systems, motivated by emerging new technologies. Readers will benefit from information about how to conduct research on the interference mitigation between IMT-Advanced and FSS. The author presents a deterministic analysis for interference to noise ratio (I/N), adjacent channel interference ratio (ACIR), field strength, and path loss propagation, in order to determine the separation distances in the co-channel interference (CCI) and adjacent channel Interference (ACI) scenarios. An analytical model is discussed, for the shielding mitigation technique based on the deterministic analysis of the propagation model. The shielding technique has been developed based on test bed measurements for evaluating the attenuation of the proposed materials. MatlabTM and Transfinite Visualyse ProTM have been used as simulation tools for the verification of the obtained results, whereas the IMT-Advanced parameters have been represented by Worldwide Interoperability for Microwave Access (WiMAX) 802.16e.

Download or read book Cognitive Radio Communications and Networks written by Alexander M. Wyglinski and published by Academic Press. This book was released on 2009-11-13 with total page 737 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cognitive Radio Communications and Networks gives comprehensive and balanced coverage of the principles of cognitive radio communications, cognitive networks, and details of their implementation, including the latest developments in the standards and spectrum policy. Case studies, end-of-chapter questions, and descriptions of various platforms and test beds, together with sample code, give hands-on knowledge of how cognitive radio systems can be implemented in practice. Extensive treatment is given to several standards, including IEEE 802.22 for TV White Spaces and IEEE SCC41 Written by leading people in the field, both at universities and major industrial research laboratories, this tutorial text gives communications engineers, R&D engineers, researchers, undergraduate and post graduate students a complete reference on the application of wireless communications and network theory for the design and implementation of cognitive radio systems and networks Each chapter is written by internationally renowned experts, giving complete and balanced treatment of the fundamentals of both cognitive radio communications and cognitive networks, together with implementation details Extensive treatment of the latest standards and spectrum policy developments enables the development of compliant cognitive systems Strong practical orientation – through case studies and descriptions of cognitive radio platforms and testbeds – shows how real world cognitive radio systems and network architectures have been built Alexander M. Wyglinski is an Assistant Professor of Electrical and Computer Engineering at Worcester Polytechnic Institute (WPI), Director of the WPI Limerick Project Center, and Director of the Wireless Innovation Laboratory (WI Lab) Each chapter is written by internationally renowned experts, giving complete and balanced treatment of the fundamentals of both cognitive radio communications and cognitive networks, together with implementation details Extensive treatment of the latest standards and spectrum policy developments enables the development of compliant cognitive systems Strong practical orientation – through case studies and descriptions of cognitive radio platforms and testbeds – shows how "real world" cognitive radio systems and network architectures have been built

Download or read book Cyclostationary Processes and Time Series written by Antonio Napolitano and published by Academic Press. This book was released on 2019-10-24 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many processes in nature arise from the interaction of periodic phenomena with random phenomena. The results are processes that are not periodic, but whose statistical functions are periodic functions of time. These processes are called cyclostationary and are an appropriate mathematical model for signals encountered in many fields including communications, radar, sonar, telemetry, acoustics, mechanics, econometrics, astronomy, and biology. Cyclostationary Processes and Time Series: Theory, Applications, and Generalizations addresses these issues and includes the following key features. Presents the foundations and developments of the second- and higher-order theory of cyclostationary signals Performs signal analysis using both the classical stochastic process approach and the functional approach for time series Provides applications in signal detection and estimation, filtering, parameter estimation, source location, modulation format classification, and biological signal characterization Includes algorithms for cyclic spectral analysis along with Matlab/Octave code Provides generalizations of the classical cyclostationary model in order to account for relative motion between transmitter and receiver and describe irregular statistical cyclicity in the data