Thanks to their considerable advantages, index modulation and orthogonal
frequency division multiplexing (OFDM) are considered to be promising
candidates for future wireless communications. This book focuses on the
index modulation techniques for OFDM communications systems, which allow
information to be conveyed not only via constellation symbols, but also
by the indices of various transmission entities in OFDM systems, such as
signal constellations, spreading codes, and pilots.
The book discusses representative transmitter and receiver designs,
optimization and performance analysis of index modulation based on
various transmission entities. It first introduces readers to
constellation-based index modulation via a combinatorial approach,
including the classical index modulation scheme and two embodiments of
information-guided precoding for OFDM systems. It further discusses
constellation-based index modulation via a permutational approach,
including the basic, generalized, and diversity-enhancing forms. It then
describes how the spreading code is used to design an index modulated
spread spectrum for OFDM systems, and the extensions to multi-code and
multi-user scenarios. In addition it explores information guided pilot
insertion for OFDM systems, followed by applications to carrier phase
tracking and channel estimation. Lastly, the book highlights a number of
open problems and discusses future research directions in the general
field of index modulation.
Intended for professionals and researchers in the field of wireless
communications, this book is also a valuable resource for advanced-level
electrical engineering and computer science students.
