On the Sum Rate of MIMO-NOMA and MIMO-OMA Systems

Ming Zeng, Animesh Yadav, Octavia A. Dobre, Georgios I. Tsiropoulos, H. Vincent Poor

Research output: Contribution to journalArticlepeer-review

141 Scopus citations


In this letter, the performance of non-orthogonal multiple access (NOMA) is compared with conventional orthogonal multiple access (OMA) over multiple-input multiple-output (MIMO) channels. It is proved analytically that for a simple scenario of two users, MIMO-NOMA dominates MIMO-OMA in terms of both sum rate and ergodic sum rate. Furthermore, for a more practical scenario of multiple users, with two users paired into a cluster and sharing a common transmit beamforming vector, the conclusion still holds. Numerical simulations are conducted, which corroborate the analytical findings.

Original languageEnglish (US)
Article number7938651
Pages (from-to)534-537
Number of pages4
JournalIEEE Wireless Communications Letters
Issue number4
StatePublished - Aug 2017

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


  • 5G systems
  • Non-orthogonal multiple access (NOMA)
  • channel capacity
  • multiple-input multiple-output (MIMO)
  • sum rate
  • user pairing


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