Interference Analysis And Reduction For Wireless Systems

This leading-edge resource offers you a new methodology for analyzing and studying the behavior of wireless communication systems in an interference environment. It provides you with modern tools and techniques for use in real-world applications that help you guarantee optimum system performance. The book treats both additive and multiplicative interfering signals, including in-depth descriptions of how these signals behave, regardless of the source.

The book describes how interference can be managed so that radio systems co-exist, without harmful mutual effects, within a finite amount of spectrum. This is timely in view of the increasing proliferation of wireless systems. It covers both the processes, such as regional or international coordination, as well as the engineering principles. Written by an author with extensive experience in the industry, it describes in detail the main methodologies for calculating or computing the interference between radio systems of the same type, and also between radio systems of different types

Intra-system EMC problems are becoming increasingly common in mobile devices, ranging from notebook PCs to cell phones, with RF/wireless capbilities. These issues range from minor annoyances to serious glitches which impede the functioning of the device. This book gives a thourough review of electromagnetic theory (including Maxwell's equations), discusses possible sources and causes of intra-system interference, shows to use models and analysis to discover potential sources of intra-system EMC in a design, how to use appropriate tests and measurements to detect intra-system EMC problems, and finally extensively discusses measures to mitigate or totally eliminate intra-system EMC problems. With more and more mobile devices incorporating wirless capability (often with multiple wireless systems, such as Bluetooth and WiFi), this book should be part of the reference shelf of every RF/wireless engineer and mobile device designer. Addresses a growing problem in RF/wireless devices----interference created inside the devices, which impair their operation Covers devices, ranging from laptop PCs to mobile phones to Bluetooth headsets Explains the sources of such intra-system interference, how to detect and measure such interference, design techniques for mitigating the interference, and proven techniques for eliminating the interference

Interference Avoidance Methods for Wireless Systems is an introduction to wireless techniques useful for uncoordinated unlicensed band systems, which use adaptive transmitters and receivers. The book provides a comprehensive theoretical analysis of interference avoidance algorithms in a general signal space framework that applies to a wide range of wireless communication scenarios with multiple users accessing the same communication resources. This book will be of interest to researchers, graduate students, and engineers working in the area of wireless communications as well as to technology policy makers working on radio frequency spectrum allocation. The book can also be used as a supplement text to advanced topics graduate courses in the area of wireless communication systems. Internet pioneer Paul Baran says of the book: "This is an important book addressing the inadequately developed subject of making more efficient use of the radio spectrum. ... The authors, two highly competent academicians, explore the subject of minimization of interference to other uses in a common spectrum space. ... (This book) is a "must read" for anyone interested in spectrum management in an increasingly wireless world."

The rapid advancement of various wireless communication system services has created the need to analyze the possibility of their performance improvement. Introducing the basic principles of digital communications performance analysis and its mathematical formalization, Fading and Interference Mitigation in Wireless Communications will help you stay up to date with recent developments in the performance analysis of space diversity reception over fading channels in the presence of cochannel interference. The book presents a unified method for computing the performance of digital communication systems characterized by a variety of modulation and detection types and channel models. Explaining the necessary concepts of digital communication system design, the book guides you step by step through the basics of performance analysis of digital communication receivers. Supplying you with the tools to perform an accurate performance evaluation of the proposed communication scenarios, the book includes coverage of multichannel reception in various fading environments, influence of cochannel interference, and macrodiversity reception when channels are simultaneously affected by various types of fading and shadowing. It also includes many numerical illustrations of applications that correspond to practical systems. The book presents a large collection of system performance curves to help researchers and system designers perform their own tradeoff studies. The presented collection of system performances will help you perform trade-off studies among the various communication type/drawback combinations in order to determine the optimal choice considering the available constraints. The concepts covered in this book can be useful across a range of applications, including wireless, satellite, terrestrial, and maritime communications.

Most books in wireless communications address technical subjects which are relevant to ground mobile systems. Volume 2: Terrestrial and Mobile Interference of the Wireless Communications Design Handbook addresses a topic frequently overlooked in ground mobile wireless system design: interference problems at the hardware level. This book employes a hardware-oriented approach, which is the most effective approach for addressing interference and noise problems in ground mobile wireless systems. The book is a practical reference for engineers who are particularly interested in practical case studies covering how to avoid undesired interference and noise problems in their designs. It covers some of the most common interference models usually addressed, and it describes material related to transmitter and receiver hardware design and how interference control plays a significant role in equipment performance. Each of the three Wireless Communications Design Handbook volumes addresses theory and immediate applications. Design issues are also considered in detail for the protection of wireless ground systems against interference. An applications-oriented reference for engineers, system designers, and practitioners Addresses the most common interference concerns in ground mobile wireless communications systems Provides a hardware-oriented approach for addressing trasmitter and receiver interference issues, as well as ground mobile designs Gives extensive detail regarding noise and interference control solutions for grounded wireless facilities Details the space interference effect in ground mobile systems Discusses hardware issues ranging from digital phones to ground stations

This thesis is concerned with the performance analysis and design of interference-limited wireless systems. Specifically, we consider wireless systems where transmissions from potential interferers are uncoordinated, i.e., there is no scheduling for the purpose of interference management. Special emphasis is placed on how the spatial distribution of the interferers affects the statistical characteristics of the interference power. The first topic we address is the performance analysis of the downlink of a cellular frequency-hopping multiple-access system, where coherent detection is employed. Channel estimation is performed with the help of hopping patterns which are broadcasted by the base-station and tracked by different users in the cell. In a time and frequency correlated channel, we identify which patterns result in the best performance in terms of the bit-error-probability at the receiver. We then consider the effect of the interference from the base-station of an adjacent cell and assess the importance of interference side information at the receiver on the bit-error-probability. The second topic we focus on is the analysis of random single-hop networks. The model we consider is that of a homogeneous Poisson point process of transmitters, each with a RX at a fixed distance. We evaluate the packet error probability and the network transmission capacity when the channel, consisting of fading and interference, is constant or varying during the packet transmission. The impact of coding, spatial diversity and multiple-stream transmission on the network capacity is identified with closed-form expressions in the small packet error probability regime. The third and final topic addressed is the evaluation of the mean end-to-end delay in random multi-hop networks. We extend the single-hop network model employed previously to accommodate routes, each consisting of a source, a number of relays and a final destination. Combining tools from the analysis of single-hop networks with queuing theory we derive a closed-form expression for the mean end-to-end delay over the typical route. The number of relays and their placement are determined such that the delay is minimized, for different packet arrival scenarios at the sources.

Despite frustrating customers and loss of revenue for telecommunications providers, cellular network congestion has remained a problem for which few solutions have been found. Covering GSM, GPRS, UMTS and beyond 3G systems, this practical book breaks new ground by providing you with proven techniques for decreasing blocking and dropped call rate due to network congestion. Using real measurements, this book clearly shows you that the maximum traffic that can be accommodated in a wireless network is not a constant value and varies significantly.