Godara Smart Antennas

1. Auflage 2004
ISBN: 978-0-203-49677-0
Verlag: CRC Press
Format: PDF
Kopierschutz: Adobe DRM (»Systemvoraussetzungen)

E-Book, Englisch, 472 Seiten

Reihe: Electrical Engineering & Applied Signal Processing Series

The use of smart antennas to increase mobile communications channels has re-ignited research and development in the field. Practicing engineers are eager to discover more about this subject, and need a comprehensive book that can provide a learning platform and prevent the loss of time spent on searches through journal literature.

Smart Antennas examines nearly all aspects of array signal processing and presents them in a logical manner. It delivers a detailed treatment of antenna array processing schemes, adaptive algorithms to adjust weighting, direction of arrival (DOA) estimation methods, diversity-combining methods that combat fading and reduce errors.

The book introduces the various processor structures suitable for the narrowband field, examining the behavior of both element space and beamspace processors. It then explores adaptive processing, focusing on the simple matrix inversion algorithm, constrained least mean squares (LMS), the neural network approach, and more. The text also describes smart antennas that are suitable for broadband signals, and presents analyses and techniques suitable for correlated fields in narrowband and broadband signals.

This volume supplements its content with extensive references, enabling you to further investigate smart antenna array schemes and application.

Zielgruppe

Students, researchers, and practitioners in communications, signal processing, wireless communications, biomedical signal processing, radar, sonar, antennas and propagation, microwaves, and electromagnetics

Autoren/Hrsg.

Godara, Lal Chand

Fachgebiete

• Technische Wissenschaften Sonstige Technologien | Angewandte Technik Signalverarbeitung, Bildverarbeitung, Scanning

Inhaltsverzeichnis

INTRODUCTION

Antenna Gain
Phased Array Antenna
Power Pattern

Beam Steering

Degree of Freedom

Optimal Antenna
Adaptive Antenna
Smart Antenna
Summary

NARROWBAND PROCESSING
Signal Model

Conventional Beamformer
Null Steering Beamformer
Optimal Beamformer
Optimization Using Reference Signal
Beam Space Processing

Effect of Errors
Notation and Abbreviations
References

ADAPTIVE PROCESSING
Sample Matrix Inversion Algorithm
Unconstrained Least Mean Squares Algorithm
Normalized Least Mean Squares Algorithm
Constrained Least Mean Squares Algorithm

Perturbation Algorithms

Structured Gradient Algorithm

Recursive LMS Algorithm

Improved Least Mean Squares Algorithm
Recursive Least Squares Algorithm.
Constant Modulus Algorithm
Conjugate Gradient Method

Neural Network Approach

Adaptive Beam Space Processing

Signal Sensitivity of Constrained LMS Algorithm
Implementation Issues

Notation and Abbreviations
References
Appendices

BROADBAND PROCESSING
Tapped-Delay Line Structure

Partitioned Realization
Derivative Constrained Processor.
Correlation Constrained Processor

Digital Beamforming

Frequency Domain Processing
Broadband Processing Using Discrete Fourier Transform Method
Performance

Notation and Abbreviations
References

CORRELATED FIELDS

Correlated Signal Model
Optimal Element Space Processor
Optimized Postbeamformer Interference Canceler Processor
Signal-to-Noise Ratio Performance
Methods to Alleviate Correlation Effects

Spatial Smoothing Method
Structured Beamforming Method

Correlated Broadband Sources

Notation and Abbreviations
References

DIRECTION-OF-ARRIVAL ESTIMATION METHODS

Spectral Estimation Methods

Minimum Variance Distortionless Response Estimator

Linear Prediction Method
Maximum Entropy Method

Maximum Likelihood Method
Eigenstructure Methods
MUSIC Algorithm
Minimum Norm Method
CLOSEST Method
ESPRIT Method

Weighted Subspace Fitting Method
Review of Other Methods

Preprocessing Techniques
Estimating Source Number

Performance Comparison

Sensitivity Analysis
References

SINGLE-ANTENNA SYSTEM IN FADING CHANNELS

Fading Channels
Channel Gain

Single-Antenna System

Notation and Abbreviations
References

DIVERSITY COMBINING

Selection Combiner
Switched Diversity Combiner
Equal Gain Combiner
Maximum Ratio Combiner
Optimal Combiner

Generalized Selection Combiner

Cascade Diversity Combiner

Macroscopic Diversity Combiner
Notation and Abbreviations
References