Abstract

This chapter extensively presents the most popular multicarrier modulation techniques such as, orthogonal frequency division multiplexing (OFDM), FilterBank MultiCarrier modulation with Offset QAM (FBMC-OQAM), universal Filtered Multicarrier (UFMC), and generalized frequency division multiplexing (GFDM). It investigates waveforms that helps to achieve the 5th-generation (5G) goals, that is, to propose modulation schemes with exceptional spectral efficiency, low out-of-band emissions (OOB), robustness against interference and synchronization errors and suitable for use in a fragmented radio spectrum. The cyclic extension has a special, beneficial role for the OFDM functionality. Besides its operation as a guard band, the cyclic prefix transforms the linear convolution of the signal with the channel response, to circular convolution. In frequency selective channels, the cyclic prefix reduces spectral efficiency even more. UFMC or Universal Filtered OFDM (UF-OFDM) focuses on the drastic reduction of OFDM side lobes. The main concept behind UFMC is to divide an OFDM waveform into components and filter each component individually.

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