Interference Mitigation by Adaptive Analog Spatial Filtering for MIMO Receivers

Masoud Abbasi Alaei*, Seyedsajad Golabighezelahmad, Pieter-Tjerk de Boer, Frank Edward van Vliet, Eric A.M. Klumperink, Andre B.J. Kokkeler

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)
8 Downloads (Pure)

Abstract

Exposed to strong cochannel/adjacent-channel interference, digital multiple-input–multiple-output (MIMO) receivers require high-dynamic-range analog-to-digital converters (ADCs). Hybrid beamforming featuring spatial filtering before the ADCs can adaptively mitigate interference in both the analog and digital domains; hence relaxing the required dynamic ranges of the ADCs. This article demonstrates the effectiveness of hybrid beamforming in this mitigation utilizing adaptive minimum mean square error (MMSE) and error vector magnitude (EVM) as an optimization criterion. Extensive EVM measurements are carried out with a conductive setup using a four-element 22-nm FD-SOI CMOS prototype MIMO receiver chip to verify the performance of the adaptive MMSE algorithm. Over-the-air (OTA) measurements with a linear four-element dipole antenna array with half-wavelength spacing in the 2.4-GHz industrial scientific and medical (ISM) band quantify the improvement for real-world scenarios, e.g., having a multipath propagation channel and mutual coupling between the antenna array elements. OTA results show that a rejection of 22.5 and 24.5 dB can be achieved on average in an in-door laboratory environment utilizing vector modulator (VM) constellations with 16 and 64 points, respectively.
Original languageEnglish
Pages (from-to)4169-4179
JournalIEEE transactions on microwave theory and techniques
Volume69
Issue number9
Early online date27 May 2021
DOIs
Publication statusPublished - Sep 2021

Keywords

  • adaptive spatial filtering
  • hybrid beamforming
  • Interference rejection
  • multiple-input–multiple-output (MIMO)
  • receiver
  • Software-defiened radio
  • vector modulator (VM)
  • Antenna measurements
  • Array signal processing
  • Interference
  • Receivers
  • Adaptive spatial filtering
  • Radio frequency
  • interference rejection
  • Computer architecture
  • vector modulator (VM).
  • software-defined radio
  • multiple-input-multiple-output (MIMO)
  • MIMO communication

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