A dCDD-Based Transmit Diversity Scheme for Downlink Pseudo-NOMA Systems

Kyeong Jin Kim, Hongwu Liu, Hongjiang Lei, Zhiguo DIng, Philip V. Orlik, H. Vincent Poor

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, a new transmit diversity scheme is proposed for cooperative pseudo-non-orthogonal multiple access (Pseudo-NOMA) without assuming full channel state information at the transmitter (CSIT). To support two users under the near-far user pairing constraint, a distributed cyclic delay diversity (dCDD) scheme is adapted into NOMA by dividing a set of remote radio heads (RRHs) into two groups for multiple cyclic-prefixed single carrier transmissions. To maximize a far user's rate and two users' sum rate over independently but non-identically distributed frequency selective fading channels and under a near-far user pairing constraint, we first derive closed-form expressions for the rates of the two users with full CSIT. Considering that only partial CSIT is available, a new RRH assignment and power allocation scheme is proposed for dCDD-Pseudo-NOMA. For various simulation scenarios, the provided link-level simulations verify that higher rates can be achieved by dCDD-Pseudo-NOMA compared with the traditional orthogonal multiple access with dCDD and dCDD-Conventional-NOMA that uses the superimposed signals. Furthermore, the proposed RRH assignment and power allocation scheme makes dCDD-Pseudo-NOMA achieve almost the same rate as that of ideal dCDD-Pseudo-NOMA which requires full CSIT.

Original languageEnglish (US)
Article number9238509
Pages (from-to)1217-1232
Number of pages16
JournalIEEE Transactions on Wireless Communications
Volume20
Issue number2
DOIs
StatePublished - Feb 2021

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

Keywords

  • Distributed cyclic delay diversity
  • Pseudo-NOMA
  • QRD-M
  • RRH cooperation
  • cyclic-prefixed single carrier transmissions
  • near-far user pairing
  • power allocation
  • rate

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