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Author: Surbhi Sandeep Jain Publisher: ISBN: 9781339447711 Category : Orthogonal frequency division multiplexing Languages : en Pages : 61
Book Description
Abstract: The main objectives of next-generation wireless networks are to accommodate the increasing user demand and to achieve ubiquitous high data rate coverage. Wireless multi hop relaying is therefore among the envisioned solutions. Relays cost less than base stations, and they can extend coverage and improve detection in a cooperative manner. Orthogonal frequency division multiple access (OFDMA) as the prospective air interface. The synergy of multi hop relaying and OFDMA techniques present a set of opportunities but, render an unsuitable environment for static resource planning. Therefore, intelligent radio resource management (RRM) schemes are required to combat the interference and to operate the relays in a dynamic and opportunistic manner so that bandwidth is efficiently utilized. Consequently, a reliable and ubiquitous service is achieved regardless of users' locations and channel conditions. In this project we did simulation using Matlab Tool and a graph of the number of user vs capacity of a channel is plotted, which shows that as the number of users increase, the throughput of the system becomes stable.
Author: Surbhi Sandeep Jain Publisher: ISBN: 9781339447711 Category : Orthogonal frequency division multiplexing Languages : en Pages : 61
Book Description
Abstract: The main objectives of next-generation wireless networks are to accommodate the increasing user demand and to achieve ubiquitous high data rate coverage. Wireless multi hop relaying is therefore among the envisioned solutions. Relays cost less than base stations, and they can extend coverage and improve detection in a cooperative manner. Orthogonal frequency division multiple access (OFDMA) as the prospective air interface. The synergy of multi hop relaying and OFDMA techniques present a set of opportunities but, render an unsuitable environment for static resource planning. Therefore, intelligent radio resource management (RRM) schemes are required to combat the interference and to operate the relays in a dynamic and opportunistic manner so that bandwidth is efficiently utilized. Consequently, a reliable and ubiquitous service is achieved regardless of users' locations and channel conditions. In this project we did simulation using Matlab Tool and a graph of the number of user vs capacity of a channel is plotted, which shows that as the number of users increase, the throughput of the system becomes stable.
Author: Ekram Hossain Publisher: John Wiley & Sons ISBN: 1118749774 Category : Technology & Engineering Languages : en Pages : 346
Book Description
Providing an extensive overview of the radio resource management problem in femtocell networks, this invaluable book considers both code division multiple access femtocells and orthogonal frequency-division multiple access femtocells. In addition to incorporating current research on this topic, the book also covers technical challenges in femtocell deployment, provides readers with a variety of approaches to resource allocation and a comparison of their effectiveness, explains how to model various networks using Stochastic geometry and shot noise theory, and much more.
Author: Tao Jiang Publisher: CRC Press ISBN: 1420088254 Category : Computers Languages : en Pages : 640
Book Description
Supported by the expert-level advice of pioneering researchers, Orthogonal Frequency Division Multiple Access Fundamentals and Applications provides a comprehensive and accessible introduction to the foundations and applications of one of the most promising access technologies for current and future wireless networks. It includes authoritative cove
Author: Ekram Hossain Publisher: Wiley ISBN: 9781118749555 Category : Technology & Engineering Languages : en Pages : 352
Book Description
Providing an extensive overview of the radio resource management problem in femtocell networks, this invaluable book considers both code division multiple access femtocells and orthogonal frequency-division multiple access femtocells. In addition to incorporating current research on this topic, the book also covers technical challenges in femtocell deployment, provides readers with a variety of approaches to resource allocation and a comparison of their effectiveness, explains how to model various networks using Stochastic geometry and shot noise theory, and much more.
Author: Ting Chen Publisher: Cuvillier Verlag ISBN: 3736935870 Category : Technology & Engineering Languages : en Pages : 124
Book Description
The OFDM transmission technique brings high efficiency in future wideband mobile communication systems. With self-organized radio resource management, an OFDM based cellular system can reach full flexibility, especially in a network with hotspots. Each base station allocates resources on demand, based on real-time measurements of signal and interference. Neither a central controller nor direct communication between base stations is needed. Additional schemes can be applied to reduce call interruptions due to unpredictable new interference after resource allocation. Future mobile communication systems require higher data rate and more flexibility. The OFDM, as a multi-carrier transmission technique, achieves high efficiency by subdividing the bandwidth into narrow and orthogonal subcarriers with specific spectrums. The consequent long symbol duration enables also a simple receiver structure in a multi-path propagation environment. Moreover, each subcarrier can use independently individual transmission parameters. In this thesis, a scheme of self-organized radio resource management is proposed for an OFDM based cellular system. All base stations in a cellular network are operating in the same central carrier frequency, but with different radio resources. A resource can be defined as a timeslot, a subcarrier, or any frequency-time block. All resources are accessible at any cell in the cellular network. Neither central controllers nor direct communication between base stations is needed. Each base station allocates radio resources and selects transmission parameters independently in accordance with the requirement and the measured real-time network condition. The powers of signal and interference are measured at both base stations and mobile terminals. To have an interference free measurement, a dedicated signal measurement timeslot is designed in the uplink. A resource quality function is defined to predict the transmission result in a time variant channel, applying both adaptive modulation and coding, and link adaptation. Those resources with highest possible data rates are allocated. In this way, an adaptive and up-to-date resource reuse can be realized. To reduce the amount of droppings due to unpredictable new interference after allocation, a security margin is introduced, which reserves a priori a space for new interference. A suitable margin brings 13% capacity increase. More efficiently, a reallocation procedure can be triggered when service degradation is observed for certain duration. This method can even bring about two times more capacity. The SO-RRM shows its high flexibility in a cellular network with non-uniform or fast changing user distribution. Hotspot cells can declare more resources, while the cells with few users use only much less resources. Furthermore, the multi-user diversity enables in the downlink adaptive resource rearrangement. Resources used inside a cell is exchanged based on instantaneous channel condition. Three different algorithms are compared. They can bring about 80% spectrum higher efficiency. Further information: - Tsinghua University (Chinese) - Tsinghua University (English) - Ruijie Networks Co., Ltd (Chinese) - Ruijie Networks Co., Ltd (English)
Author: Hui Liu Publisher: John Wiley & Sons ISBN: 0471757187 Category : Computers Languages : en Pages : 265
Book Description
OFDM-based Broadband Wireless Networks covers the latest technological advances in digital broadcasting, wireless LAN, and mobile networks to achieve high spectral efficiency, and to meet peak requirements for multimedia traffic. The book emphasizes the OFDM modem, air-interface, medium access-control (MAC), radio link protocols, and radio network planning. An Instructor Support FTP site is available from the Wiley editorial department.
Author: Ye Geoffrey Li Publisher: Springer Science & Business Media ISBN: 0387302352 Category : Technology & Engineering Languages : en Pages : 314
Book Description
Orthogonal Frequency Division Multiplexing for Wireless Communications is an edited volume with contributions by leading authorities in the subject of OFDM. Its coverage consists of principles, important wireless topics (e.g. Synchronization, channel estimation, etc.) and techniques. Included is information for advancing wireless communication in a multipath environment with an emphasis on implementation of OFDM in base stations. Orthogonal Frequency Division Multiplexing for Wireless Communications provides a comprehensive introduction of the theory and practice of OFDM. To facilitate the readers, extensive subject indices and references are given at the end of the book. Even though each chapter is written by different experts, symbols and notations in all chapters of the book are consistent.
Author: Chen Chen Publisher: Springer ISBN: 3030193926 Category : Technology & Engineering Languages : en Pages : 132
Book Description
This book introduces the sources and historic collection campaigns of resource allocation in wireless communication systems. The unique characteristics of MIMO-OFDMA systems are thoroughly studied and summarized. Remarks on resource allocation and spectrum sharing are also presented, which demonstrate the great value of resource allocation techniques, but also introduce distinct challenges of resource allocation in MIMO-OFDMA systems. Novel resource allocation techniques for OFDMA Systems are surveyed from various applications (e.g., for unicast, or multicast with Guaranteed BER and Rate, subcarrier and power allocation with various detectors, low-complexity energyefficient resource allocation, etc.) in this book. Due to the high mobility and low latency requirements of 5G wireless communications, this book discusses how to deal with the imperfect CSI. It also discusses how to deal with e.g., throughput maximization, outage probabilities maximization and guarantee, energy efficiency, physical-layer security issues with feedback channel capacity constraints, in order to characterize and understand the applications of practical scenes. This book will target professionals & researchers working in the fields of Wireless Communications and Networking, Resource Allocation and Transmissions. Advanced-level students in electrical engineering and computer science will also find this book useful as a secondary textbook.
Author: David T. Wong Publisher: John Wiley & Sons ISBN: 9780470434932 Category : Technology & Engineering Languages : en Pages : 528
Book Description
An introduction to theories and applications in wireless broadband networks As wireless broadband networks evolve into future generation wireless networks, it's important for students, researchers, and professionals to have a solid understanding of their underlying theories and practical applications. Divided into two parts, the book presents: Enabling Technologies for Wireless Broadband Networks—orthogonal frequency-division multiplexing and other block-based transmissions; multi-input/multi-output antenna systems; ultra-wideband; medium access control; mobility resource management; routing protocols for multi-hop wireless broadband networks; radio resource management for wireless broadband networks; and quality of service for multimedia services Systems for Wireless Broadband Networks—long-term evolution cellular networks; wireless broadband networking with WiMax; wireless local area networks; wireless personal area networks; and convergence of networks Each chapter begins with an introduction and ends with a summary, appendix, and a list of resources for readers who would like to explore the subjects in greater depth. The book is an ideal resource for researchers in electrical engineering and computer science and an excellent textbook for electrical engineering and computer science courses at the advanced undergraduate and graduate levels.
Author: Elias Yaacoub Publisher: John Wiley & Sons ISBN: 1118074505 Category : Technology & Engineering Languages : en Pages : 298
Book Description
Tackling problems from the least complicated to the most, Resource Allocation in Uplink OFDMA Wireless Systems provides readers with a comprehensive look at resource allocation and scheduling techniques (for both single and multi-cell deployments) in uplink OFDMA wireless networks relying on convex optimization and game theory to thoroughly analyze performance. Inside, readers will find topics and discussions on: Formulating and solving the uplink ergodic sum-rate maximization problem Proposing suboptimal algorithms that achieve a close performance to the optimal case at a considerably reduced complexity and lead to fairness when the appropriate utility is used Investigating the performance and extensions of the proposed suboptimal algorithms in a distributed base station scenario Studying distributed resource allocation where users take part in the scheduling process, and considering scenarios with and without user collaboration Formulating the sum-rate maximization problem in a multi-cell scenario, and proposing efficient centralized and distributed algorithms for intercell interference mitigation Discussing the applicability of the proposed techniques to state-of-the-art wireless technologies, LTE and WiMAX, and proposing relevant extensions Along with schematics and figures featuring simulation results, Resource Allocation in Uplink OFDMA Wireless Systems is a valuable book for?wireless communications and cellular systems professionals and students.
Author: Surbhi Sandeep Jain
Author: Surbhi Sandeep Jain
Author: Ekram Hossain
Author: Tao Jiang
Author: Ekram Hossain
Author: Ting Chen
Author: Hui Liu
Author: Ye Geoffrey Li
Author: Chen Chen
Author: David T. Wong
Author: Elias Yaacoub