DFT-s-OFDM: Enabling flexibility in frequency selectivity and multiuser diversity for 5G

Institute of Electrical and Electronics Engineers (IEEE)
Publication Type:
Journal Article
IEEE Consumer Electronics Magazine, 2020, 9, (6), pp. 15-22
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© 2012 IEEE. The upcoming fifth-generation (5G) wireless cellular communication systems are expected to provide efficiency and productivity by ushering in flexibility of waveforms and resource allocation. Clustered discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) has been specified as the waveform for 5G, due to its flexibility in the exploitation of frequency selectivity and multiuser diversity. This article discusses the flexibility that clustered DFT-s-OFDM is able to achieve at the physical layer, and the requirements that it needs to comply with at the media access control layer. This article emphasizes on the resource allocation of clustered DFT-s-OFDM that can leverage between the flexibility and compliance requirements, and reveals that clustered DFT-s-OFDM is suited for cells with UEs closely distributed around the base stations. A new enhanced riding peak method, which operates on the basis of multiple resolutions, is identified to be able to balance the data rate of clustered DFT-s-OFDM and computational complexity.
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