Smart Antennas

Practicing engineers need a comprehensive book that can provide a learning platform and prevent the loss of time spent on searches through journal literature. This resource examines nearly all aspects of array signal processing and presents them in a logical manner.

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.

INTRODUCTION Antenna GainPhased Array AntennaPower Pattern Beam Steering Degree of Freedom Optimal AntennaAdaptive AntennaSmart AntennaSummary NARROWBAND PROCESSINGSignal Model Conventional BeamformerNull Steering BeamformerOptimal BeamformerOptimization Using Reference SignalBeam Space Processing Effect of ErrorsNotation and AbbreviationsReferencesADAPTIVE PROCESSINGSample Matrix Inversion AlgorithmUnconstrained Least Mean Squares AlgorithmNormalized Least Mean Squares AlgorithmConstrained Least Mean Squares Algorithm Perturbation Algorithms Structured Gradient Algorithm Recursive LMS Algorithm Improved Least Mean Squares AlgorithmRecursive Least Squares Algorithm.Constant Modulus AlgorithmConjugate Gradient Method Neural Network Approach Adaptive Beam Space Processing Signal Sensitivity of Constrained LMS AlgorithmImplementation Issues Notation and AbbreviationsReferencesAppendicesBROADBAND PROCESSINGTapped-Delay Line Structure Partitioned RealizationDerivative Constrained Processor.Correlation Constrained Processor Digital Beamforming Frequency Domain ProcessingBroadband Processing Using Discrete Fourier Transform MethodPerformance Notation and AbbreviationsReferencesCORRELATED FIELDS Correlated Signal ModelOptimal Element Space ProcessorOptimized Postbeamformer Interference Canceler ProcessorSignal-to-Noise Ratio PerformanceMethods to Alleviate Correlation Effects Spatial Smoothing MethodStructured Beamforming Method Correlated Broadband Sources Notation and AbbreviationsReferencesDIRECTION-OF-ARRIVAL ESTIMATION METHODS Spectral Estimation Methods Minimum Variance Distortionless Response Estimator Linear Prediction MethodMaximum Entropy Method Maximum Likelihood MethodEigenstructure MethodsMUSIC AlgorithmMinimum Norm MethodCLOSEST MethodESPRIT Method Weighted Subspace Fitting MethodReview of Other Methods Preprocessing TechniquesEstimating Source Number Performance Comparison Sensitivity AnalysisReferencesSINGLE-ANTENNA SYSTEM IN FADING CHANNELS Fading ChannelsChannel Gain Single-Antenna System Notation and AbbreviationsReferencesDIVERSITY COMBINING Selection CombinerSwitched Diversity CombinerEqual Gain CombinerMaximum Ratio CombinerOptimal Combiner Generalized Selection Combiner Cascade Diversity Combiner Macroscopic Diversity CombinerNotation and AbbreviationsReferences