ABSTRACT
This introduction presents an overview of the key concepts discussed in the subsequent chapters of this book. The book aims to present channel tracking techniques for estimating the channel impulse response and track its variations. It reviews the mathematical models representing the physical channels and introduces time-varying frequency selective channels. The book deals with a brief introduction of Orthogonal Frequency-Division Multiplexing (OFDM) and Single Carrier with Frequency Domain Equalization (SC-FDE) block transmission techniques that are especially adequate for severely time-dispersive channels. It analyses the impact of the number of multipath components and the diversity order on the asymptotic performance of OFDM and SC-FDE for different channel coding scheme. The book focuses on the problem of the use of SC-FDE transmission in channels with strong Doppler effects. It describes the OFDM modulation and explains the basic aspects of the SC-FDE modulation including the linear and iterative FDE receivers.
