Bøger af Ramjee Prasad

Written by a leading authority, this timely new work offers today's wireless professionals a complete understanding of OFDM technology and applications in wireless communications systems, placing emphasis on wireless LANs (local area networks) and PANs (personal area networks).

The next generation mobile communication networks (4G) have the challenging target of The next generation mobile communication networks (4G) have the challenging target of providing a peak data rate of 1 Gigabit per second local area and 100 Megabit per second wide area. The ability to offer such high data rates in 100MHz bandwidth requires overall a very high spectral efficiency, and hence the need for multi-antenna techniques (MIMO) with spatial multiplexing, fast dynamic link adaptation and packet scheduling, wideband access techniques, and most likely non-contention based spectrum sharing among multiple operators. Many of these required technology components and techniques are well researched and established. Adaptive PHY-MAC Design for Broadband Wireless Systems explains how one can integrate and optimise their use in providing the target cell data rates with high availability. The authors address the ability to cope with interference and enhanced physical layer processing, and simultaneously, the multifaceted system level design. Focus is also on the selection of technology components and techniques, which leads to the highest spectral efficiency and peak data rate availability with reasonable Quality of Service (QoS) support, such as improved outage scenario, reduced delay, guaranteed bit rate, etc.In short, this book will answer questions such as, how individual techniques relate to each other, how can we benefit the gains by suitable combinations of different technologies and how to choose different technological solutions in different scenarios, etc.The next generation mobile communication networks (4G) have the challenging target of The next generation mobile communication networks (4G) have the challenging target of providing a peak data rate of 1 Gigabit per second local area and 100 Megabit per second wide area.

The first of a three-volume series on the latest research and developments in the field of mobile communications, this cutting-edge resource offers practical insight into the next generation of wireless systems, services, and applications. Culled from groundbreaking research associated with the Information Society Technologies (IST) program, this unique book helps professionals understand how the networks of tomorrow will evolve into a common, open platform, capable of delivering a range of voice, video, and data services in a combined and seamless manner. This forward-looking volume covers a wide-range of important topics, from the architectures of future wireless systems and the importance of short-range systems in the global communication society, to service platforms/technologies and application platforms. The DVD included contains further details on critical topics related to the research discussed in the book.

The development of new mobile multimedia services is certain to create new issues for future mobile communication systems. This second volume on the latest research and developments in the field offers a survey of the management and network optimization methods that will help you overcome the challenges that lie ahead. Like its companion volumes, research results from the Information Society Technologies (IST) program has been gathered to give you details in the most critical areas. The key topics include the management of heterogeneous and hybrid networks, advanced resource management techniques, cutting-edge radio technologies, advances in the development of satellite systems as part of a global integrated communication system, research on interactive broadcasting, and end-to-end solutions for delivery of services and guaranteed QoS.

This book discusses a broad range of cyber security issues, addressing global concerns regarding cyber security in the modern era.

This book introduces context-aware computing, providing definitions, categories, characteristics, and context awareness itself and discussing its applications with a particular focus on smart learning environments.

Relay systems have become a subject of intensive research interest over the recent years, as it is recognized that they can improve performances and extend the coverage area of wireless communication systems. Special attention has been dedicated to them since the proposal appeared for their implementation in mobile cellular systems. Numerous researches conducted after that proposal have enabled incorporation of OFDM based relay systems in both accepted standards for IMT-Advanced systems. Nowadays, researches are ongoing with the aim to define new solutions for performance improvement of the standardized OFDM relay systems for cellular networks and one of the interesting solutions is implementation of subcarrier permutation (SCP) at the relay (R) station. The book "e;OFDM based relay systems for future wireless communications"e; presents a comprehensive research results in analyzing behavior and performance of the OFDM based relay systems with SCP. Dual-hop relay scenario with three communication terminals, and no direct link between the source (S) and the destination (D) has been analyzed, as it is compliant with the accepted solutions for IMT-Advanced systems. The book includes performance analysis and performance comparison of OFDM based: amplify-and-forward (AF) relay systems with fixed gain (FG), amplify-and-forward (AF) relay systems with variable gain (VG), decode-and-forward (DF) relay systems,each including two SCP schemes, known to maximize the system capacity and/or improve the bit error rate (BER) performances. Performance comparisons have enabled definition of optimal solutions for the future wireless communication systems in a given conditions, and for the given optimality criteria. OFDM based relay systems for future wireless communications contains recent research results in this area and is ideal for the academic staff and master/research students in area of mobile communication systems, as well as for the personnel in communication industry.

This book offers an accessible introduction and practical guide to Voice over Internet Protocol (VoIP) technology, providing readers with the know-how to solve the problems encountered in applying VoIP technology across all types of network.

Discusses the various aspects of the architecture, operation, possible challenges, and mechanisms to overcome in 5G technology. Further, it supports users interaction through communication devices relying on Human Bond Communication and Communication-Navigation-Sensing-Services (CONASENSE).

WiMAX Networks covers aspects of WiMAX quality of service (QoS), security, mobility, radio resource management, multiple input multiple output antenna, planning, cost/revenue optimization, physical layer, medium access control (MAC) layer, network layer, and so on.

A study of OFDM, including a comparison with other forms of single carrier modulation methods. It provides the design guidelines for maximising the benefits from this technology. There is practical advice on how to plan, design and use OFDM to make wireless multimedia communications happen.

This book reveals the state-of-the-art in wireless ad-hoc networking. It further discusses some of the key research topics that are expected to promote and accelerate the commercial application of these networks (e.g., MAC, routing, QoS, optimization issues, service discovery, traffic models, mobility, handovers, security).

The focus of this book is on mechanisms that affect the VoIP user satisfaction while not explicitly involved in the media session. The book thus investigates and proposes cross-layer techniques for realizing time-efficient control mechanisms for VoIP.

This book reveals the state-of-the-art in wireless ad-hoc networking. It further discusses some of the key research topics that are expected to promote and accelerate the commercial application of these networks (e.g., MAC, routing, QoS, optimization issues, service discovery, traffic models, mobility, handovers, security).

Comparison between UWB and traditional narrow-band systems highlights the following features: Large bandwidth enables very fine time-space resolution for accurate lo- tion of the UWB nodes and for distributing network time stamps.

WiMAX Networks covers aspects of WiMAX quality of service (QoS), security, mobility, radio resource management, multiple input multiple output antenna, planning, cost/revenue optimization, physical layer, medium access control (MAC) layer, network layer, and so on.

Comparison between UWB and traditional narrow-band systems highlights the following features: Large bandwidth enables very fine time-space resolution for accurate lo- tion of the UWB nodes and for distributing network time stamps.

The focus of this book is on mechanisms that affect the VoIP user satisfaction while not explicitly involved in the media session. The book thus investigates and proposes cross-layer techniques for realizing time-efficient control mechanisms for VoIP.

The importance of this book is not only related to being the first work on personal networks. It also gives an overview of the operation of big projects such as MAGNET, while the organization of the book itself mirrors the way the project has been structured.