Impact of RF Processing and Switching Errors in Lens-Based Massive MIMO Systems

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


Lens–based massive multiple–input multiple–output (MIMO) systems have considerable potential to reduce signal processing cost at millimeter–wave frequencies. As a result, they are able to lower the effective channel dimension via beam selection, realized with a network of radio–frequency (RF) switches. However, lens arrays suffer from the inherent quantization of the beamspace, as well as errors due to imperfections in the lens construction itself. Unlike prior works, we model the above effects in the context of a Rotman lens–enabled massive MIMO system. Assuming line–of–sight propagation, we derive analytical approximations of the expected (average) signal–to–interference–plus–noise–ratio (SINR) of a terminal and ergodic sum spectral efficiency of the system. Our analysis caters for spillover losses in the Rotman lens and imperfections in the RF switching matrix, caused by impedance mismatches, as well as poor port isolation. The presented numerical results show large degradation in the expected SINR and ergodic spectral efficiency when considering the above imperfections, yielding more accurate performance assessment of lens–based massive MIMO systems.


  • Harsh Tataria
  • Michail Matthaiou
  • Peter J Smith
  • George C Alexandropoulos
  • Vincent F Fusco
External organisations
  • Queen's University Belfast
  • Victoria University of Wellington
  • Huawei Technologies France
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Communication Systems


  • RF beamsteering, RF switching, Imperfect processing, SINR, Spectral efficiency, Millimeter-wave systems, Rotman lens arrays
Original languageEnglish
Title of host publicationIEEE 19th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) 2018
PublisherIEEE - Institute of Electrical and Electronics Engineers Inc.
Number of pages5
ISBN (Electronic)978-1-5386-3512-4
ISBN (Print)978-1-5386-3513-1
Publication statusPublished - 2018 Jun 25
Publication categoryResearch
Event19th IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2018 - Kalamata, Greece
Duration: 2018 Jun 252018 Jun 28


Conference19th IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2018