BDMA for Millimeter-Wave/Terahertz Massive MIMO Transmission with Per-Beam Synchronization

Li You, Xiqi Gao*, Geoffrey Ye Li, Xiang Gen Xia, Ni Ma

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

136 Citations (Scopus)

Abstract

We propose beam division multiple access (BDMA) with per-beam synchronization (PBS) in time and frequency for wideband massive multiple-input multiple-output (MIMO) transmission over millimeter-wave (mmW)/Terahertz (THz) bands. We first introduce a physically motivated beam domain channel model for massive MIMO and demonstrate that the envelopes of the beam domain channel elements tend to be independent of time and frequency when both the numbers of antennas at base station and user terminals (UTs) tend to infinity. Motivated by the derived beam domain channel properties, we then propose PBS for mmW/THz massive MIMO. We show that both the effective delay and Doppler frequency spreads of wideband massive MIMO channels with PBS are reduced by a factor of the number of UT antennas compared with the conventional synchronization approaches. Subsequently, we apply PBS to BDMA, investigate beam scheduling to maximize the ergodic achievable rates for both uplink and downlink BDMA, and develop a greedy beam scheduling algorithm. Simulation results verify the effectiveness of BDMA with PBS for mmW/THz wideband massive MIMO systems in typical mobility scenarios.

Original languageEnglish
Article number7913686
Pages (from-to)1550-1563
Number of pages14
JournalIEEE Journal on Selected Areas in Communications
Volume35
Issue number7
DOIs
Publication statusPublished - Jul 2017
Externally publishedYes

Keywords

  • Millimeter-wave
  • Terahertz
  • beam division multiple access (BDMA)
  • massive MIMO
  • per-beam synchronization
  • statistical channel state information (CSI)

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