Hybrid Beamforming with Variable RF Attenuator for Multi-User mmWave Systems

Jungjoo Lee, Taeseok Oh, Jihwan Moon, Changick Song, Byeongsi Lee, Inkyu Lee

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


In this paper, we propose a novel hybrid beamforming design algorithm in multi-user massive multiple-input-multiple-output millimeter-wave channels. In the proposed structure, we employ variable radio frequency attenuators at each phase shifter which flexibly controls the transmit signal amplitude to achieve the performance of fully digital (FD) precoders. We formulate a power loss minimization problem which can be easily solved via the alternating optimization process. Simulation results demonstrate that the proposed architecture achieves the same performance as the FD scheme with the reduced number of radio frequency chains and the proposed scheme exhibits a 37.4% power gain over conventional methods.

Original languageEnglish
Article number9097913
Pages (from-to)9131-9134
Number of pages4
JournalIEEE Transactions on Vehicular Technology
Issue number8
Publication statusPublished - 2020 Aug

Bibliographical note

Funding Information:
Manuscript received November 12, 2019; revised March 12, 2020; accepted May 13, 2020. Date of publication May 21, 2020; date of current version August 13, 2020. This work was supported by the National Research Foundation through the Ministry of Science, ICT, and Future Planning (MSIP), Korean Government under Grant 2017R1A2B3012316. The review of this article was coordinated by Dr. H. Lin. (Corresponding author: Inkyu Lee.) Jungjoo Lee, Jihwan Moon, and Inkyu Lee are with the School of Electrical Engineering, Korea University, Seoul 02841, South Korea (e-mail: dlwjdwn888@gmail.com; anschino@korea.ac.kr; inkyu@korea.ac.kr).

Publisher Copyright:
© 1967-2012 IEEE.


  • Hybrid beamforming
  • millimeter wave systems
  • variable RF attenuator

ASJC Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Applied Mathematics


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