This book discusses the enhanced non-contiguous orthogonal frequency division multiplexing (NC-OFDM), filter-bank based multicarrier (FBMC), and generalized multicarrier (GMC) flexibility. It examines particular properties of these technologies that allow for spectrum aggregation and opportunistic and efficient spectrum usage within the identified key directions of 5G. This book contains six chapters. Chapter 1 presents state-of-the-art multicarrier technologies for radio communication. Chapter 2 introduces the principles of NC-OFDM and discusses efficient NC-OFDM transmitter and receiver...