Interference Mitigation by Adaptive Analog Spatial Filtering for MIMO Receivers

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

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)
218 Downloads (Pure)


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
Article number9443039
Pages (from-to)4169-4179
Number of pages11
JournalIEEE transactions on microwave theory and techniques
Issue number9
Early online date27 May 2021
Publication statusPublished - Sept 2021


  • Adaptive spatial filtering
  • Hybrid beamforming
  • Interference rejection
  • Multiple-input–multiple-output (MIMO)
  • Software-defiened radio
  • Vector Modulator (VM)
  • Antenna measurements
  • Array signal processing
  • Interference
  • Receivers
  • Radio frequency
  • Computer architecture
  • MIMO communication


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