io (SIR) gain that can be achieved with W-OFDM when compared with the normal OFDM. Chapter 4 describes GFDM, which was one of the candidate waveforms for 5G, pro- posed as a generalized form of OFDM. The chapter highlights the role of GFDM in the implementation of multicarrier systems. Further, the chapter presents a unified Preface time-frequency representation of GFDM, which allows a better understanding of GFDM structure and enables a comprehensive analysis. The chapter then introduces GFDM modem implementation in a practical architecture, which is more flexible than OFDM. This structure provides additional degrees of freedom for the processing of conventional and new waveforms. Finally, for practical exploitation of GFDM, the chapter introduces integration of GFDM modem as a precoding technique on top of OFDM system. Chapter 5 presents a short review of FBMC techniques. The fundamental theory behind construction of FBMC waveforms with maximum compactness in time and frequency are presented. Moreover, a number of effective methods for designing the prototype filters for this class of multicarrier systems are reviewed. The topics of synchronization and tracking are treated in detail, and equalization and computational complexity are discussed briefly. In terms of applications, this chapter brings up a number of appealing features of FBMC waveforms that make them an ideal choice in the emerging area of massive multiple-input multiple-output (MIMO) networks. Chapter 6 covers the basics of OTFS modulation and presents its discrete-time formula- tion. An in-depth analysis of the channel impact on transmit data symbols is also provided. This brings deeper insights into OTFS. The derived formulation in this chapter reveals that the precoding and post-processing units can be combined with OFDM modulator and demodulator, respectively, which leads to a simplified modem structure. Through compu- tational complexity analysis, this chapter shows that in realistic scenarios, OTFS modem becomes simpler than OFDM to implement