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Contenido

Feedforward Amplifiers for Wideband Communication Systems has been possible thanks to the research carried out throughout several years in the field of the linearization techniques applied to digital communication systems, particularly to those with high spectral efficient modulation techniques. The wireless telecommunications are more and more demanded for the Information Society. Such requirements are reflected as a great many of communication standards with specific coverage applications and, above all, with higher and higher data transmission rates. The electromagnetic spectrum, nevertheless, is a scarce asset that can not be spread and despite the increasingly tendency to transmit in higher frequencies, the bandwidths assigned to each application are always exploited to the limit.

   INDICE: Dedication. Preface. Acknowledgments.- 1. Introduction.- Radio-Electric transmitters - Historical overview.- Digital communication systems.- Digital modulation.- 2. Nonlinear distortion.- Harmonic distortion.- Intermodulation analysis.- Cross modulation (XMOD).- Distortion measurement techniques.- Measurements of wideband digital signals.- 3. RF power amplifiers.- Classification of power amplifiers.- Power amplifiers parameters.- Class A.- Class B.- Class AB (outphasing).- Class C.- Switching amplifiers.- More operating modes.- 4. Linearization techniques.- Classification of the linearization techniques.- Feedback.- Predistortion.- Feedforward.- Efficiency enhancement techniques.- Comparison of linearization techniques.- 5. Feedforward amplifiers.- Feedforward linearization technique.- Feedforward in wideband communications systems.- 6. Implementation of Feedforward amplifiers.- Simulation of the Feedforward architecture.- Selection of the error amplifier.- The adjustment of the cancellation loops.- Distortion enhanced measurement techniques.- Improvements of Feedforward amplifier.- 7. Adaptive Feedforward amplifiers.- Adaptive adjusting methods for Feedforward amplifiers.- Distortion monitoring architectures.- An output signal monitoring architecture.- The adaptive Feedforward amplifier.- Conclusions.

Interés para ...

Scientists, practitioners, students, all system design engineers that are starting to focus their research on the Feedforward linearization technique, a starting point for hardware developers that try to achieve the desired trade-off between the efficiency and linearity parameters in base station and repeater transmitters

Detalles del artículo

• Páginas : 216
• Editorial : SPRINGER VERLAG INC.
• Idioma : Inglés
• Fecha de Publicación : 01/09/2006
• ISBN: 978-0-387-35137-7
• Encuadernación : Cartoné
• Nº Volúmenes : 1
• País de Publicación : Estados Unidos