Fundamental limits of low-density spreading NOMA with fading
Artikel i vetenskaplig tidskrift, 2018

Spectral efficiency of low-density spreading non-orthogonal multiple access channels in the presence of fading is derived for linear detection with independent decoding and optimum decoding. The large system limit, where both the number of users and number of signal dimensions grow with fixed ratio, called load, is considered. In the case of optimum decoding, it is found that low-density spreading underperforms dense spreading for all loads. Conversely, linear detection is characterized by different behaviors in the underloaded versus overloaded regimes. In particular, it is shown that spectral efficiency changes smoothly as load increases. However, in the overloaded regime, the spectral efficiency of low-density spreading is higher than that of dense spreading.

multiple access channels

non-orthogonal multiple access (NOMA)

Spectral efficiency


Mai T.P. Le

Sapienza, Università di Roma

Guido Ferrante

Chalmers, Elektroteknik, Kommunikations- och antennsystem, Kommunikationssystem

Massachusetts Institute of Technology (MIT)

Singapore University of Technology and Design

Tony Q.S. Quek

Singapore University of Technology and Design

Maria Gabriella Di Benedetto

Sapienza, Università di Roma

IEEE Transactions on Wireless Communications

1536-1276 (ISSN)

Vol. 17 7 4648-4659







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