Li, A;
Masouros, C;
(2017)
Hybrid Massive MIMO Unlicensed Transmission with 1-Bit Quantization.
In:
2017 IEEE Globecom Workshops (GC Wkshps).
IEEE
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Abstract
We study the downlink beamforming schemes for the unlicensed wireless transmission in the cognitive radio (CR) Z-channel, where a massive multiple-input-multiple-output (MIMO) secondary base station (SBS) is considered with limited radio frequency (RF) chains and low-cost 1-bit digital-to-analog converters (DACs). In this paper, we design the analog beamformer based on the singular value decomposition (SVD) of the channel, and for the digital beamforming, instead of designing a linear transmit beamforming matrix, we propose to directly design the transmit signals by exploiting the concept of constructive interference, where the interference from the SBS to the primary users (PUs) is also taken into consideration. The optimization problem is then formulated based on the geometry of the modulation constellations and is shown to be non-convex. We then propose to solve the problem in two steps, where we firstly relax the constraint of 1-bit DACs, followed by the normalization in each entry of the baseband signals to satisfy the 1-bit DAC transmission. Numerical results show that the proposed scheme achieves an improved performance over the conventional downlink CR beamforming for the massive MIMO SBS with the hybrid structure and 1-bit DACs.
| Type: | Proceedings paper |
|---|---|
| Title: | Hybrid Massive MIMO Unlicensed Transmission with 1-Bit Quantization |
| Event: | 36th IEEE Global Communications Conference (GLOBECOM), 4-8 Dec. 2017, Singapore, Singapore |
| Location: | Singapore, SINGAPORE |
| Dates: | 04 December 2017 - 08 December 2017 |
| ISBN-13: | 9781538639207 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/GLOCOMW.2017.8269160 |
| Publisher version: | https://doi.org/10.1109/GLOCOMW.2017.8269160 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Massive MIMO, 1-bit quantization, downlink, constructive interference, cognitive radio |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10058936 |
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