Smart Antennas
CRC Press
464 pages; $139.95, £85.00
ISBN: 0-8493-1206-X
Smart antennas involve processing of signals induced on an array of sensors such as antennas, microphones and hydrophones. They have applications in the areas of radar, sonar, medical imaging and communications. The smart antenna field has been a very active area of research for over four decades. During this time, many types of processors for smart antennas have been proposed and their performance studied. Currently, the use of smart antennas in mobile communications to increase the capacity of communication channels has reignited research and development in this field. After some introductory material in Chapter 1, the detail work on smart antennas starts in Chapter 2, where various processor structures suitable for narrow band field are discussed. Adaptive processing is presented in Chapter 3, with details on the sample matrix inversion algorithm, constrained and unconstrained least mean square (LSM) algorithms, recursive LSM algorithm, recursive least square, constant modulus algorithm, conjugate gradient method and neural network approach. Smart antennas suitable for broadband signals are discussed in Chapter 4. Processing of broadband signals can be carried out in the time domain as well as in the frequency domain. Chapter 5 presents models for a correlated field in a situation of multipath signals. In Chapter 6, various direction of arrival (DOA) estimation methods are described, followed by performance comparisons and sensitivity analyses. In Chapter 7, a brief review of fading channels is presented, distribution of signal amplitude and received power on an antenna is developed, and analysis of noise- and interference-limited single antenna systems in Raleigh and Nakagama fading channels is presented by deriving results for average bit error rate and outage probability. Chapter 8 presents a comprehensive analysis of diversity combining, which is a process of combining several signals with independent fading characteristics to reduce large attenuation of the desired signal in the presence of multipath signals.
To order this book, contact: CRC Press, 2000 NW Corporate Blvd., Boca Raton, FL 33431-9868 (800) 272-7737.
Introduction to Microelectromechanical Microwave Systems, Second Edition
Artech House Inc.
234 pages; $99, £66
ISBN: 1-58053-871-1
This book provides an update on the development of the microelectromechanical systems (MEMS) field over the last five years, and continues to be a timely resource for workers already involved in, or interested in using the potential of RF MEMS to revolutionize wireless portables, base stations and satellite communications. Chapter 1 starts by reviewing the origins, impetus and motivation of the MEMS field, putting into perspective its development up to the present and describing the fundamentals of the technology. Chapter 2 deals with the fundamental physics of electrostatic, piezoelectric, thermal and magnetic actuation, which are the principles on which most MEMS devices applied to RF and microwave systems operate. This chapter also introduces the rudiments of computer-aided design (CAD) numerical and analytical simulation techniques, which are crucial for the rapid prototyping, development and commercialization of MEMS. Chapters 3 and 4 describe the physics and circuit models for the fundamental MEM devices, namely the switch and the resonator, respectively. Chapter 5 surveys and thoroughly explains RF and microwave applications. In a systematic way, the operation, fabrication and performance of the fundamental MEM devices and techniques, as applied to switches, resonators, transmission lines and lumped passive elements, are discussed, with emphasis on the interplay between fabrication process and microwave performance. Finally, Chapter 6 presents the fundamentals of wireless communications systems and the application of MEMS-based devices and techniques in these systems. Since the intended readership of the book includes materials, process and device scientists and engineers who may not be familiar with RF and microwave electronics, the presentation follows a semi-intuitive, common-sense approach, complete with the fundamentals and MEMS applications to a variety of important RF and microwave circuits, namely phase shifters, resonators, filters and oscillators.
To order this book, contact: Artech House Inc., 685 Canton St., Norwood, MA 02062 (781) 769-9750 ext. 4030; or 46 Gillingham St., London SW1V 1HH UK +44 (0) 207-8750.