Download or read book Interference and Outage Optimization in Multi user Multi carrier Communication Systems written by Sumanth Jagannathan and published by . This book was released on 2008 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interference and outage optimization in multi-user multi-carrier communication systems.

Download or read book Multicarrier Communications written by Lie-Liang Yang and published by John Wiley & Sons. This book was released on 2009-01-21 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: Benefiting from both time-domain and frequency-domain signal processing techniques, multicarrier systems have the potential for achieving high spectral-efficiency, high-flexibility and low-complexity wireless communications. Multicarrier techniques therefore constitute the promising techniques for implementation of future generations of wideband, broadband and ultra-wideband systems. Multicarrier Communications offers comprehensive and in-depth evaluation of numerous topics in the area, covering the fundamental principles of spread-spectrum and multicarrier CDMA as well as more advanced topics such as multiuser detection (MUD), multiuser transmitter preprocessing (MUTP), MIMO and space-time processing. It examines OFDM and various multicarrier CDMA within an unified framework and provides analytical approaches and formulas for error-performance evaluation of numerous multicarrier systems. Examines MUD and MUTP in parallel to illustrate the strong duality between receiver optimization and transmitter optimization Comprehensively establishes the theory of noncoherent MUD and noncoherent interference suppression Details the body of knowledge on MIMO theory and space-time multicarrier communications Contains tables, diagrams and figures to illustrate the performance results. Practicing electrical engineers and researchers in wireless communications will find Multicarrier Communications an invaluable guide. It will also be of interest to senior undergraduate and graduate students on wireless communications courses.

Download or read book Multi user Interference Reduction and Throughput Enhancement in OFDM based Multicarrier Communication Systems written by Kyoungnam Seo and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: (MMSE) multi-user detector and transmit power control, which results in an enhanced signal-to-noise ratio (SNR) and reduced transmit power consumption. In PLC systems, OFDM is combined with a bit-loading algorithm to increase throughput. Since the number of bits to carry at each sub-carrier is assigned by the SNR level, the throughput of the system is directly affected by impulsive noise. Our study focuses on the detection and mitigation of impulsive noise in PLC networks. We propose a time domain impulsive noise mitigation algorithm. This two-step iterative algorithm improves the data rate by up to 15 percent with a small addition of one OFDM block size memory. Finally, we consider SS-MC-MA systems that take advantage of DMT's adaptive bit-loading technique and CDMA's multi-user channel access. To further increase the throughput, we propose a dynamic sub-carrier allocation algorithm in SS-MC-MA-based PLC systems. Systems with the proposed algorithm show the average throughput increase up to 20 percent comparing to the conventional DMT systems and 10 percent comparing to the existing SS-MC-MA-based PLC systems.

Download or read book Performance and Power Optimization of Multicarrier Communication Systems in the Presence of Nonlinear Distortion written by Je-hong Jong and published by . This book was released on 2000 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Multi Objective Optimization System Designs and Their Applications written by Bor-Sen Chen and published by CRC Press. This book was released on 2023-12-05 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces multi-objective design methods to solve multi-objective optimization problems (MOPs) of linear/nonlinear dynamic systems under intrinsic random fluctuation and external disturbance. The MOPs of multiple targets for systems are all transformed into equivalent linear matrix inequality (LMI)-constrained MOPs. Corresponding reverse-order LMI-constrained multi-objective evolution algorithms are introduced to solve LMI-constrained MOPs using MATLAB®. All proposed design methods are based on rigorous theoretical results, and their applications are focused on more practical engineering design examples. Features: Discusses multi-objective optimization from an engineer’s perspective. Contains the theoretical design methods of multi-objective optimization schemes. Includes a wide spectrum of recent research topics in control design, especially for stochastic mean field diffusion problems. Covers practical applications in each chapter, like missile guidance design, economic and financial systems, power control tracking, minimization design in communication, and so forth. Explores practical multi-objective optimization design examples in control, signal processing, communication, and cyber-financial systems. This book is aimed at researchers and graduate students in electrical engineering, control design, and optimization.

Download or read book System Analysis and Performance Comparison of Different Multi carrier Schemes written by Yongfeng Chen and published by . This book was released on 2007 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multicarrier modulation techniques are attracting great interest in emerging wireless communication systems such as fourth generation cellular systems and evolutions of IEEE802.11 (WiFi) and IEEE802.16 (WiMax) air interfaces. The analysis is made complex as a result of many combinations of modulation scheme parameters such as number of subcarriers, degree of spreading, method of spreading in time and frequency, interplay between modulation and coding parameters, and synchronicity between the signals of different users. The goal of this thesis is to illustrate various multicarrier system structures and analyze parameter trade-offs with emphasis on systems with non-synchronous users in order to optimize system performance.There are three main results in this thesis. First we study a multicarrier CDMA system with a repetition code structure. In such a system, decreasing the repetition code rate can lead to more frequency diversity. However, to keep the same transmit bit rate, the spreading factor of each subcarrier needs to be reduced. We investigate the tradeoff between the spreading factor and the rate of repetition code in a system with fixed transmit bit rate, bit energy and allocated bandwidth. The system performance is analyzed and the outage probability is calculated. It is shown that when the number of users in the system becomes large, the code rate needs to be increased in order to maintain a low outage probability. Meanwhile, in a system with a given number of users, if a threshold SINR with large value is required, we should increase the spreading factor in order to achieve a low outage probability.Secondly, unlike the conventional multicarrier CDMA schemes, where spreading codes are utilized to realize multiple access (i.e., combining bit streams from different users), and frequency division is utilized for multiplexing (i.e., combining different bit sub-streams from the same user), we reverse the roles and utilize spreading codes for multiplexing and frequency division for multiple access. That is, bits from the same user are spread with different codes and transmitted on the same subcarrier. We propose a new scheme called CDM-OFDMA and make a comparison with other well known schemes. We place the four multicarrier schemes (MC-DS-CDMA, MC-CDMA, CDM-OFDMA, OFCDM) into a unified analytic framework. With a single-path channel model, the comparative performances of these four schemes in terms of bit error rate (BER) are as follows: OFCDM (better than) CDM-OFDMA (better than) MC-CDMA (almost equal to) MCDS-CDMA.Thirdly we study the peak power problem in the multicarrier systems. Different methods are listed and compared. We propose an algorithm which is used to find a generator matrix for a linear block code, while its codewords will not produce a large peak to average power ratio (PAPR) after the IFFT operation. The performances of the proposed algorithm and the random phase shift algorithm are compared numerically. It is shown that although the proposed algorithm does not control the peak power as good as the random phase shift algorithm, the systems with these two algorithms have close BER performances. Beside this, our algorithm comes with an advantage that it can be designed off-line.

Download or read book Dynamic Resource Allocation in Multiuser Multicarrier Fading Environments written by Yang Xu and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Interference among users results in the degradation of signal quality and leads to poor performance in multi-user interference systems such as DSL system, ad-hoc wireless network. Study of the interaction of interference among users in the network is crucial for achieving better system performance. Efficient utilization of available resources in an interference system has two major complementary approaches: interference cancellation and resource allocation. The principal objective of this thesis is to develop efficient resource allocation algorithms that can optimize joint perfounance of multiple users in multi-user multi-carrier interference channels. Such resource allocation problems in multi-user interference channels can be formulized as nonconvex optimization problems. The search for the optimal solution is very challenging for these problems: conventional local optimization techniques are only capable of finding local optimum; In addition, resource allocation problems encountered in practice generally are large-scale ones, as the number of users or the number of sub-carriers in the system is typically large. For instance, digital subscriber lines (DSL) system, which is employed as a motivating practical model in this dissertation, has thousands of sub-carriers and large number of lines residing in a binder that cause interference to each other. Designing distributed and centralized resource allocation strategies to achieve good optimality and complexity tradeoff for multi-user interference systems by exploiting the underlining problem structures is the main focus of this thesis. This thesis develops two dynamic resource allocation strategies, responding to different requirements that might arise in various practical scenarios of DSL environment: one is a low-complexity, quasi-distributed algorithm that achieves near-optimal performance with very little centralized coordination; the other is a centralized algorithm based on global difference of convex (d.c.) optimization that guarantees optimal performance with substantial complexity reduction. Our global d.c. approach reveals the hidden convexity of nonconvex optimization problems in interference systems, which were once thought of completely being devoid of any convexity structure. The d.c. structure provides a general framework for designing efficient global optimization algorithm for resource allocation in multi-user interference channel. In particular, a modified prismatic branch and bound (PBnB) is proposed to find global optimum efficiently and its global convergence is also established by analysis. Furthermore, motivated by the observation that the excessive transmission power penalty incurred by zero forcing (ZF) precoding scheme with user selection algorithm for MIMO Broadcast (BC) channels contributing to sum-rate capacity loss, we also explore joint power allocation and interference pre-cancellation (precoding) for wireless MIMO BC channels. A channel inversion regularization (CIR) strategy is proposed to replace ZF as the precoding scheme to alleviate the excessive transmission power penalty and we formulate the maximization of the sum-rate capacity with CIR precoding into d.c. structure and thereafter its global optimum can be achieved with PBnB algorithm. Moreover, we propose a local optimization method based on gradient projection (GP) to achieve near-optimal solution efficiently and we also conduct asymptotic analysis to show that the proposed CIR precoding scheme can achieve asymptotically optimum sum rate equal to that of dirty paper coding (DPC) strategy."--

Download or read book Communications in Interference Limited Networks written by Wolfgang Utschick and published by Springer. This book was released on 2016-02-04 with total page 519 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers means to handle interference as a central problem of operating wireless networks. It investigates centralized and decentralized methods to avoid and handle interference as well as approaches that resolve interference constructively. The latter type of approach tries to solve the joint detection and estimation problem of several data streams that share a common medium. In fact, an exciting insight into the operation of networks is that it may be beneficial, in terms of an overall throughput, to actively create and manage interference. Thus, when handled properly, "mixing" of data in networks becomes a useful tool of operation rather than the nuisance as which it has been treated traditionally. With the development of mobile, robust, ubiquitous, reliable and instantaneous communication being a driving and enabling factor of an information centric economy, the understanding, mitigation and exploitation of interference in networks must be seen as a centrally important task.

Download or read book Power and Bandwidth Optimization for Multicarrier Communication Systems written by Brian Scott Krongold and published by . This book was released on 1997 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Multiple Access Techniques for 5G Wireless Networks and Beyond written by Mojtaba Vaezi and published by Springer. This book was released on 2018-08-23 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents comprehensive coverage of current and emerging multiple access, random access, and waveform design techniques for 5G wireless networks and beyond. A definitive reference for researchers in these fields, the book describes recent research from academia, industry, and standardization bodies. The book is an all-encompassing treatment of these areas addressing orthogonal multiple access and waveform design, non-orthogonal multiple access (NOMA) via power, code, and other domains, and orthogonal, non-orthogonal, and grant-free random access. The book builds its foundations on state of the art research papers, measurements, and experimental results from a variety of sources.

Download or read book Smart Antennas Electromagnetic Interference and Microwave Antennas for Wireless Communications written by S. Kannadhasan and published by CRC Press. This book was released on 2023-02-17 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers all areas of smart antennas, electromagnetic interference, and microwave antennas for wireless communications. Smart antennas or adaptive antennas are multi-antenna components on one or both sides of a radio communication connection, combined with advanced signal processing algorithms. They've evolved into a critical technology for third-generation and beyond mobile communication systems to meet their lofty capacity and performance targets. It seems that a significant capacity gain is achievable, particularly if they are employed on both sides of the connection. There are several essential characteristics of these systems that need scientific and technical investigation. Included in the book are beamforming, massive MIMO, network MIMO, mmwave transmission, compressive sensing, MIMO radar, sensor networks, vehicle-to-vehicle communication, location, and machine learning.

Download or read book Fundamentals of Wireless Communication written by David Tse and published by Cambridge University Press. This book was released on 2005-05-26 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook takes a unified view of the fundamentals of wireless communication and explains cutting-edge concepts in a simple and intuitive way. An abundant supply of exercises make it ideal for graduate courses in electrical and computer engineering and it will also be of great interest to practising engineers.

Download or read book Spectrum Sharing written by Constantinos B. Papadias and published by John Wiley & Sons. This book was released on 2020-03-13 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combines the latest trends in spectrum sharing, both from a research and a standards/regulation/experimental standpoint Written by noted professionals from academia, industry, and research labs, this unique book provides a comprehensive treatment of the principles and architectures for spectrum sharing in order to help with the existing and future spectrum crunch issues. It presents readers with the most current standardization trends, including CEPT / CEE, eLSA, CBRS, MulteFire, LTE-Unlicensed (LTE-U), LTE WLAN integration with Internet Protocol security tunnel (LWIP), and LTE/Wi-Fi aggregation (LWA), and offers substantial trials and experimental results, as well as system-level performance evaluation results. The book also includes a chapter focusing on spectrum policy reinforcement and another on the economics of spectrum sharing. Beginning with the historic form of cognitive radio, Spectrum Sharing: The Next Frontier in Wireless Networks continues with current standardized forms of spectrum sharing, and reviews all of the technical ingredients that may arise in spectrum sharing approaches. It also looks at policy and implementation aspects and ponders the future of the field. White spaces and data base-assisted spectrum sharing are discussed, as well as the licensed shared access approach and cooperative communication techniques. The book also covers reciprocity-based beam forming techniques for spectrum sharing in MIMO networks; resource allocation for shared spectrum networks; large scale wireless spectrum monitoring; and much more. Contains all the latest standardization trends, such as CEPT / ECC, eLSA, CBRS, MulteFire, LTE-Unlicensed (LTE-U), LTE WLAN integration with Internet Protocol security tunnel (LWIP) and LTE/Wi-Fi aggregation (LWA) Presents a number of emerging technologies for future spectrum sharing (collaborative sensing, cooperative communication, reciprocity-based beamforming, etc.), as well as novel spectrum sharing paradigms (e.g. in full duplex and radar systems) Includes substantial trials and experimental results, as well as system-level performance evaluation results Contains a dedicated chapter on spectrum policy reinforcement and one on the economics of spectrum sharing Edited by experts in the field, and featuring contributions by respected professionals in the field world wide Spectrum Sharing: The Next Frontier in Wireless Networks is highly recommended for graduate students and researchers working in the areas of wireless communications and signal processing engineering. It would also benefit radio communications engineers and practitioners.

Download or read book UMTS Network Planning Optimization and Inter Operation with GSM written by Moe Rahnema and published by John Wiley & Sons. This book was released on 2008-04-15 with total page 349 pages. Available in PDF, EPUB and Kindle. Book excerpt: UMTS Network Planning, Optimization, and Inter-Operation with GSM is an accessible, one-stop reference to help engineers effectively reduce the time and costs involved in UMTS deployment and optimization. Rahnema includes detailed coverage from both a theoretical and practical perspective on the planning and optimization aspects of UMTS, and a number of other new techniques to help operators get the most out of their networks. Provides an end-to-end perspective, from network design to optimization Incorporates the hands-on experiences of numerous researchers Single authorship allows for strong coherency and accessibility Details the complete iteration cycle of radio link budgeting for coverage planning and dimensioning Rahnema demonstrates detailed formulation of radio capacity and coverage in UMTS, and discusses the tradeoffs involved. He presents complete link budgeting and iterative simulations for capacity and coverage planning, along with practical guidelines. UMTS Network Planning contains seventeen cohesive and well-organized chapters which cover numerous topics, including: Radio channel structures, radio channel models, parameters, model tuning Techniques for capacity and coverage enhancements Complete treatment of power control, handoffs and radio resource practical management processes and parameters Detailed coverage of TCP protocol enhancement for operation over wireless links, particularly UMTS Application of GSM measurements to plan and re-engineer for UMTS radio sites Guidelines for site co-location with GSM, the QOS classes, parameters and inter-workings in UMTS AMR voice codecs and tradeoffs, core and access network design, architectural evolution, and protocols Comprehensive discussion and presentation of practical techniques for radio performance analysis, trending, and troubleshooting Perfect for professionals in the field and researchers specializing in network enhancement. Engineers working on other air interfaces and next generation technologies will find many of the techniques introduced helpful in designing and deploying future wireless networks as well. Students and professionals new to the wireless field will also find this book to be a good foundation in network planning, performance analysis, and optimization.

Download or read book Resource Allocation in Next Generation Broadband Wireless Access Networks written by Singhal, Chetna and published by IGI Global. This book was released on 2017-02-14 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the growing popularity of wireless networks in recent years, the need to increase network capacity and efficiency has become more prominent in society. This has led to the development and implementation of heterogeneous networks. Resource Allocation in Next-Generation Broadband Wireless Access Networks is a comprehensive reference source for the latest scholarly research on upcoming 5G technologies for next generation mobile networks, examining the various features, solutions, and challenges associated with such advances. Highlighting relevant coverage across topics such as energy efficiency, user support, and adaptive multimedia services, this book is ideally designed for academics, professionals, graduate students, and professionals interested in novel research for wireless innovations.

Download or read book Electrical Electronics Abstracts written by and published by . This book was released on 1997 with total page 1904 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Single And Multi Carrier Mimo Transmission for Broadband Wireless Systems written by Ramjee Prasad and published by CRC Press. This book was released on 2022-09-01 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main focus of Single- and Multi-Carrier MIMO Transmission for Broadband Wireless Systems is to provide the basic understanding of the underlying techniques related to PHY-MAC design of future wireless systems. It includes basic concepts related to single- and multi-carrier transmissions together with MIMO techniques. Discussions related to different recent standards that use single- and multi-carrier transmissions are also explained.Single- and Multi-Carrier MIMO Transmission for Broadband Wireless Systems provides a comprehensive and holistic approach to the variety of technical solutions. Future system design would require these different technologies to work together, and not independently. Therefore, it is very important to analyze the effects and gains when they are put together in a unified platform. This is the prime focus of this book. Moreover, the authors include recent research results which are not yet published in another form. The book is intended to be used for lectures in graduate level courses at universities. PhD level students should also find it useful as this book will outline the fundamental concepts and design methods for PHY and MAC layers of future wireless systems. This book can also be used as a reference by engineers and developers in the industry as well as by researchers in academia. For professionals, system architects and managers who play a key role in the selection of a baseline system concept for future wireless standards, such as IMT-Advanced type architecture, the authors will include discussions, analysis and guidelines to highlight overall system level perspective.