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

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

Research output: Contribution to journalArticle

5 Citations (Scopus)


In this paper, we propose an efficient hybrid beamforming algorithm for multi-pair 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 inter-pair 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
JournalIEEE Transactions on Vehicular Technology
Publication statusAccepted/In press - 2018 May 15


  • Antennas
  • Array signal processing
  • Gold
  • Interference
  • MIMO communication
  • Radio frequency
  • Relays

ASJC Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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