OFDM Enhancements for 5G Based on Filteringand Windowing
01 January 2019
In this chapter, different variants envisioned for the 5G new radio (NR) waveform implementation are discussed, satisfying the 5G NR requirements for release 15 and beyond. We outline the limitations of conventional CP-OFDM in serving the potential use cases for NR. Two main classes of waveform pre-processing are considered to increase the spectral decay rate of CP-OFDM; namely windowing and filtering. Three waveforms are selected for the comparison; namely windowed overlap-add (WOLA) as a windowing technique, universal filtered orthogonal frequency division multiplex (UF-OFDM) and filtered orthogonal frequency division multiplex (f-OFDM) as subband filtering techniques. We outline the design principles of all three waveforms and discuss the overall performance and implementation aspects.
