Contents


Preface

This book presents information on modulation and examines methods for improving the deployment and technical characteristics of wireless communication systems

Chapter 1 shows that low-energy transmitters with adaptive amplitude modulation (AM) may transmit narrowband signals without coding in real time and with spectral–energy efficiency, attaining the limits established by Shannon's theorems. The only requirement is high-quality feedback channels delivering controls from

Chapter 2 presents an original and low-complexity method for fast and accurate analysis and demodulation of orthogonal frequency-division multiplexing (OFDM) signals with unknown structure and parameters in conditions of uncertainty and noise. The focus is on identifying the type of modulation and parameters of the subcarrier as well as eliminating inter-channel interference

Chapter 3 presents research on the capabilities and advantages of electro-optic lithium niobate (LiNbO3) modulators for optical communications. It discusses methods of fiber integration, connection to microwave electrodes, box sealing, and fabrication for on-chip implementation. In addition, it presents results of interferometric optical sensing via an electro-optic manipulating light

Chapter 4 considers possibilities of using polarization of radio frequency (RF) signals and propagation direction as additional carriers of information. Attention is paid to the most important aspects of the proposed modulation schemes: polarization-agile antennas and active integrated array antennas, which integrate an oscillator and modulators, and polarization discrimination antennas. The

Chapter 5 discusses the main optical phase-modulation techniques, and the most appropriate technique is used for the elaboration of original phase modulation processes for the optical Sagnac interferometer gyroscope. It is shown that closed-loop configuration of gyroscope provides a greater accuracy (sensitivity to declinations)

Chapter 6 presents the results of studies on the analysis and design of injected oscillators generating carrier signals. New results concern the analytical methods of locking and pulling phenomena. The chapter also reviews the application of injected oscillators, in particular, injection-locked frequency dividers. It also

and networks.

and phase errors.

field.

base stations to the forward transmitter.

chapter also introduces receiving antennas.

and scale-factor stability than the open-loop analog.

proposes an original method of enhancing locking range.
