NOMA with Zero-Forcing V-BLAST

ÖZYURT S., Simon E. P., Farah J.

IEEE Communications Letters, vol.24, no.9, pp.2070-2074, 2020 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 24 Issue: 9
  • Publication Date: 2020
  • Doi Number: 10.1109/lcomm.2020.2997365
  • Journal Name: IEEE Communications Letters
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, PASCAL, Aerospace Database, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.2070-2074
  • Keywords: average sum rate, Multiple-input multiple-output, non-orthogonal multiple access, zero-forcing V-BLAST
  • Ankara Yıldırım Beyazıt University Affiliated: Yes

Abstract

© 1997-2012 IEEE.In this study, power-domain non-orthogonal multiple access (NOMA) is combined with zero-forcing (ZF) vertical Bell Labs layered space-time (V-BLAST) technique. Motivated by the fact that the successive interference cancellation (SIC) is a pivotal element in either technique, we thoroughly investigate the impact of SIC on inter-user and inter-layer interference. A two-user downlink scenario is investigated where a multi-antenna base station with no instantaneous channel state information simultaneously communicates with two users each with multiple antennas. The average sum rate of the considered system is analytically derived in an exact form. Correspondingly, the power allocation value on each substream is optimized such that the average sum rate is maximized. We show that when the classical power-domain NOMA idea is incorporated into the ZF V-BLAST algorithm, the far user cannot completely cancel inter-layer interference. Nonetheless, the proposed approach turns out to yield an average sum rate performance near to that of a higher-complexity method based on maximum likelihood detection.