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 language | English |
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Title of host publication | VTC 2020 - Fall - Virtual Conference |
Place of Publication | Victoria, BC, Canada |
Publisher | IEEE |
Number of pages | 5 |
ISBN (Electronic) | 978-1-7281-9484-4 |
ISBN (Print) | 978-1-7281-9485-1 |
DOIs | |
Publication status | Published - 1 Dec 2020 |
Event | 92nd Vehicular Technology Conference, VTC 2020-Fall - Virtual Conference Duration: 18 Nov 2020 → 16 Dec 2020 Conference number: 92 https://events.vtsociety.org/vtc2020-fall/ |
Conference
Conference | 92nd Vehicular Technology Conference, VTC 2020-Fall |
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Abbreviated title | VTC 2020-Fall |
City | Virtual Conference |
Period | 18/11/20 → 16/12/20 |
Internet address |
Keywords
- Spatial filtering
- digital demodulation
- MIMO
- Error Vector Magnitude
- Constellation Diagram
- QAM
- interference rejection
- Over-the-Air Measurement