Imperial College London
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ProfessorBrunoClerckx

Faculty of Engineering, Department of Electrical and Electronic Engineering

Professor of Wireless Communications and Signal Processing
 
 
 
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Contact

 

+44 (0)20 7594 6234b.clerckx Website

 
 
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Location

 

816Electrical EngineeringSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Clerckx:2021:10.1109/OJCOMS.2021.3084799,
author = {Clerckx, B and Mao, Y and Schober, R and Jorswieck, E and Love, DJ and Yuan, J and Hanzo, L and Ye, Li G and Larsson, EG and Caire, G},
doi = {10.1109/OJCOMS.2021.3084799},
journal = {IEEE Open Journal of the Communications Society},
pages = {1310--1343},
title = {Is NOMA efficient in multi-antenna networks? A critical look at next generation multiple access techniques},
url = {http://dx.doi.org/10.1109/OJCOMS.2021.3084799},
volume = {2},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - In  the  past  few  years,  a  large  body  of  literature  has  been  created  on  downlink  Non-Orthogonal  Multiple  Access  (NOMA),employing  superposition  coding  and  Successive  Interference  Cancellation  (SIC),  in  multi-antenna  wireless  networks.  Furthermore, the benefits of NOMA over Orthogonal Multiple Access (OMA) have been highlighted. In this paper, we take a critical and fresh look at the downlink Next Generation Multiple Access (NGMA) literature. Instead of contrasting NOMA with OMA, we contrast NOMA with two other multiple access baselines. The first is conventional Multi-User Linear Precoding (MU–LP), as used in Space-Division Multiple Access (SDMA) and multi-user Multiple-Input Multiple-Output (MIMO) in 4G and 5G. The second, called Rate-Splitting Multiple  Access  (RSMA),  is  based  on  multi-antenna  Rate-Splitting  (RS).  It  is  also  a  non-orthogonal  transmission  strategy  relying on  SIC  developed  in  the  past  few  years  in  parallel  and  independently  from  NOMA.  We  show  that  there  is  some  confusion  about the  benefits  of  NOMA,  and  we  dispel  the  associated misconceptions. First,  we  highlight  why  NOMA  is  inefficient  in  multi-antenna settings  based  on  basic  multiplexing  gain  analysis.  We  stress  that  the  issue  lies  in  how  the  NOMA  literature,  originally  developed for single-antenna setups, has been hastily applied to multi-antenna setups, resulting in a misuse of spatial dimensions and therefore loss in multiplexing gains and rate. Second, we show that NOMA incurs a severe multiplexing gain loss despite an increased receiver complexity  due  to  an  inefficient  use  of  SIC  receivers. Third,  we  emphasize  that  much  of  the  merits  of  NOMA  are  due  to  the constant  comparison  to  OMA  instead  of  comparing  it  to  MU–LP  and  RS  baselines.  We  then  expose  the  pivotal design constraint that  multi-antenna  NOMA  requires  one  user  to  fully  decode  the
AU  - Clerckx,B
AU  - Mao,Y
AU  - Schober,R
AU  - Jorswieck,E
AU  - Love,DJ
AU  - Yuan,J
AU  - Hanzo,L
AU  - Ye,Li G
AU  - Larsson,EG
AU  - Caire,G
DO  - 10.1109/OJCOMS.2021.3084799
EP  - 1343
PY  - 2021///
SN  - 2644-125X
SP  - 1310
TI  - Is NOMA efficient in multi-antenna networks? A critical look at next generation multiple access techniques
T2  - IEEE Open Journal of the Communications Society
UR  - http://dx.doi.org/10.1109/OJCOMS.2021.3084799
UR  - https://ieeexplore.ieee.org/document/9451194
UR  - http://hdl.handle.net/10044/1/90029
VL  - 2
ER  -
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