Analytical Framework of Hybrid Beamforming in Multi-Cell Millimeter-Wave Systems

Shu Sun, Theodore Rappaport, Mansoor Shafi, Harsh Tataria

Research output: Contribution to journalArticle

Abstract

Multi-cell wireless systems usually encounter both intracell and inter-cell interference, which can be mitigated via coordinated multipoint (CoMP) transmission. Previous works on multi-cell analysis in the microwave band generally consider fully digital beamforming, requiring a complete radio-frequency chain behind each antenna. This is practically infeasible for millimeter-wave (mmWave) systems where large amounts of antennas are necessary to provide sufficient gain and to enable transmission/reception of multiple streams to/from a user. This article provides a general methodology to analytically compute the expected per-cell spectral efficiency of a mmWave multi-cell single-stream system using phase-shifter-based analog beamforming and regularized zero-forcing digital beamforming. Four analog-digital hybrid beamforming techniques for multi-cell multi-stream mmWave communication are proposed, assuming that base stations in different cells share channel state information to cooperatively transmit signals to their home-cell users. Spectral efficiency of the proposed hybrid beamforming approaches are investigated and compared using two channel models suitable for fifth-generation cellular systems, namely the 3rd Generation Partnership Project model and the NYUSIM model. Numerical results show that the benefits of base station coordination (as compared to the no-coordination case) are governed by the underlying propagation model, and the aggregate interference levels proportional to the cell radius and number of users per cell.

Original languageEnglish (US)
JournalIEEE Transactions on Wireless Communications
DOIs
StateAccepted/In press - Sep 13 2018

Fingerprint

Millimeter Wave
Beamforming
Millimeter waves
Cell
Base stations
Antennas
Spectral Efficiency
Phase shifters
Channel state information
Antenna
Interference
Microwaves
Framework
Analogue
Zero-forcing
Cellular Systems
Channel Model
Communication
Channel State Information
Microwave

Keywords

  • 5G
  • Antenna arrays
  • Array signal processing
  • Channel models
  • CoMP
  • hybrid beamforming
  • Interference
  • millimeter wave (mmWave)
  • MIMO
  • multi-cell
  • Radio frequency
  • Receiving antennas
  • Transmitting antennas

ASJC Scopus subject areas

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

Cite this

Analytical Framework of Hybrid Beamforming in Multi-Cell Millimeter-Wave Systems. / Sun, Shu; Rappaport, Theodore; Shafi, Mansoor; Tataria, Harsh.

In: IEEE Transactions on Wireless Communications, 13.09.2018.

Research output: Contribution to journalArticle

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