Signal Superposition in NOMA with Proper and Improper Gaussian Signaling

Ali Arshad Nasir, Hoang Duong Tuan, Ha H. Nguyen, Trung Q. Duong, H. Vincent Poor

Research output: Contribution to journalArticlepeer-review

Abstract

Recent studies of single-cell two-user networks have shown that a higher network throughput is achieved by using a common message to be decoded by both users and conveying partial information for both users, rather than using the common message to convey the entire information for one of the two users. The latter is essentially the conventional non-orthogonal multiple access (NOMA), which performs better than orthogonal multiple access (OMA) only under users' dissimilar channel conditions. Unlike NOMA, the former performs consistently better than OMA. This paper generalizes such a signaling strategy to a general multi-cell multiuser network, which leads to a new NOMA approach (called n-NOMA) in which each pair of users decodes a message that conveys partial information for one of them only. Unlike the conventional NOMA, whose performance is dependent on the users' pairing strategy, the proposed n-NOMA consistently outperforms both NOMA and OMA schemes. Both proper and improper Gaussian signaling is considered for all the concerned schemes and it is shown that the latter is clearly more advantageous than the former.

Original languageEnglish (US)
Article number9137361
Pages (from-to)6537-6551
Number of pages15
JournalIEEE Transactions on Communications
Volume68
Issue number10
DOIs
StatePublished - Oct 2020

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Keywords

  • improper Gaussian signaling (IGS)
  • max-min throughput optimization
  • non-orthogonal multiple access (NOMA)
  • orthogonal multiple access (OMA)
  • Signal superposition

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