000			01945cam a2200169 4500
100	1		_aHAN Shuangfeng
700			_aXIE Tian
700			_aLIN Chih
245			_aGreener physical layer technologies for 6G mobile communications/ _cShuangfeng Han, Tian Xie and Chih-Lin
260			_c2021
520			_aIn this article, the fundamental EE-spectrum efficiency (SE) joint design issues are thoughtfully considered. The relationships between EE and SE in single-input single-output (SISO), multiple-input multiple-output, and hybrid beamforming structures are first reviewed, where the increase of SE (EE) will unfortunately bring a reduction of EE (SE). To resolve this contradiction, a non-orthogonal multiple access (NOMA) scheme with energy-efficient user scheduling and resource allocation is investigated, which promises a simultaneous increase of EE and SE. Furthermore, a precoded waveform overlapping multiplexing scheme is presented, with significant improvements in EE and SE over the traditional Nyquist-criterion-based SISO systems. The waveform overlapping multiple access scheme is further proposed, which promises large performance improvements over the NOMA schemes discussed in 5G New Radio. The application of the waveform overlapping scheme in multiple-antenna systems is also investigated. Finally, the challenges of the waveform overlapping scheme and several other research topics are discussed. For sustainable development of the wireless communications industry, greener design in physical layer technologies should be second to none in the future 6G networks and beyond.
650			_aENERGY EFFICIENCY _xEE _xMOBILE COMMUNICATIONS _xNETWORKS _xSPECTRUM EFFICIENCY _xSE _x5G/6G NETWORKS
773			_aIEEE Communications Magazine : _gVol 59, No 4, April 2021. pp.68-74 (147)
598			_aENERGY, IT, TECHNOLOGY
856			_uhttps://ieeexplore.ieee.org/document/9433520 _zClick here for full text
945			_i66948.1001 _rY _sY
999			_c41057 _d41057