EVM-based performance evaluation of Co-channel interference mitigation using spatial filtering for digital MIMO-receivers

Seyedsajad Golabighezelahmad*, Eric A.M. Klumperink, Bram Nauta

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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Abstract

Abstract —Digital Multiple-Input Multiple-Output (MIMO) receivers, exposed to strong co-channel interference, require high dynamic range Analog-to-Digital Converters (ADCs) and a highly linear RF front-end. Hybrid analog-digital beamforming can mitigate this co-channel interference by spatial filtering before the ADC and improve interference robustness. This paper demonstrates and characterizes this mitigation effect in detail utilizing Error Vector Magnitude (EVM) as a criterion. A 4-element 22 nm FD-SOI CMOS prototype MIMO Receiver chip is characterized with a linear 4-element dipole antenna array with half-wavelength spacing in the 2.4 GHz ISM-band. EVM measurements demonstrate the effectiveness of spatial filtering for co-channel interference mitigation and dynamic range extension. The receiver is exposed to interference while using different QAM formats (16-QAM to 256-QAM). It is demonstrated how interference reduces the acceptable-EVM input power range, while hybrid beamforming extends this range. This is done by extensive conductive measurements for reliable results, while also demonstrating an Over-the-Air (OTA) result
Original languageEnglish
Title of host publicationVTC 2020 - Fall - Virtual Conference
Place of PublicationVictoria, BC, Canada
PublisherIEEE
Number of pages5
ISBN (Electronic)978-1-7281-9484-4
ISBN (Print)978-1-7281-9485-1
DOIs
Publication statusPublished - 1 Dec 2020
Event92nd Vehicular Technology Conference, VTC 2020-Fall - Virtual Conference
Duration: 18 Nov 202016 Dec 2020
Conference number: 92
https://events.vtsociety.org/vtc2020-fall/

Conference

Conference92nd Vehicular Technology Conference, VTC 2020-Fall
Abbreviated titleVTC 2020-Fall
CityVirtual Conference
Period18/11/2016/12/20
Internet address

Keywords

  • Spatial filtering
  • digital demodulation
  • MIMO
  • Error Vector Magnitude
  • Constellation Diagram
  • QAM
  • interference rejection
  • Over-the-Air Measurement

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