Abstract
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.
Original language | English |
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Title of host publication | IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) 2018 |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
Number of pages | 5 |
ISBN (Electronic) | 978-1-5386-3512-4 |
ISBN (Print) | 978-1-5386-3513-1 |
DOIs | |
Publication status | Published - 29 Aug 2018 |
Event | 19th IEEE INTERNATIONAL WORKSHOP ON SIGNAL PROCESSING ADVANCES IN WIRELESS COMMUNICATIONS - Kalamata, Greece Duration: 25 Jun 2018 → 29 Jun 2018 http://spawc2018.org/ |
Publication series
Name | International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) |
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Publisher | IEEE |
ISSN (Electronic) | 1948-3252 |
Conference
Conference | 19th IEEE INTERNATIONAL WORKSHOP ON SIGNAL PROCESSING ADVANCES IN WIRELESS COMMUNICATIONS |
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Abbreviated title | SPAWC 2018 |
Country/Territory | Greece |
Period | 25/06/2018 → 29/06/2018 |
Internet address |
Keywords
- Ergodic sum spectral efficiency
- Lens arrays
- Massive MIMO
- Millimeter Wave
- RF processing
- RF switching
- SINR