Hybrid Analog-Digital Filter Designs for mmWave Multipair Two-Way Relaying Systems

Taeseok Oh, Changick Song, Jaein Kim, Seokju Jang, Inkyu Lee

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


In this correspondence, we propose an efficient hybrid beamforming algorithm for multipair two-way relaying systems with a large number of antenna elements. We first investigate an asymptotic behavior of the fully digital (FD) case where the number of radio frequency (RF) chains equals that of antenna elements. Our analysis reveals that the optimal RF filters can be determined by the array response vectors in the asymptotic region without consideration of the baseband (BB) filters. From this observation, we provide a new RF filter design based on the Gram-Schmidt process. Also, in order to manage interpair interference, we design BB filters based on the weighted sum minimum mean square error for given RF filters. Our simulation results demonstrate that as the number of antenna elements grows, our method achieves the optimal FD performance with much reduced computational complexity.

Original languageEnglish
Article number8360071
Pages (from-to)7841-7845
Number of pages5
JournalIEEE Transactions on Vehicular Technology
Issue number8
Publication statusPublished - 2018 Aug

Bibliographical note

Funding Information:
Manuscript received November 18, 2017; revised February 28, 2018 and May 1, 2018; accepted May 12, 2018. Date of publication May 16, 2018; date of current version August 13, 2018. This work was supported by the Future Combat System Network Technology Research Center Program of Defense Acquisition Program Administration and Agency for Defense Development under Grant UD160070BD. The review of this paper was coordinated by Prof. H.-F. Lu. (Corresponding author: Inkyu Lee.) T. Oh, J. Kim, S. Jang, and I. Lee are with the School of Electrical Engineering, Korea University, Seoul 136-713, South Korea (e-mail:, jets00@korea.ac.kr; kji_07@korea.ac.kr; seokju@korea.ac.kr; inkyu@korea.ac.kr).

Publisher Copyright:
© 1967-2012 IEEE.


  • Asymptotic analysis
  • hybrid beamforming
  • millimeter wave communications
  • two-way relaying

ASJC Scopus subject areas

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


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