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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.
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.
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