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Hybrid Massive MIMO Unlicensed Transmission with 1-Bit Quantization

Li, A; Masouros, C; (2017) Hybrid Massive MIMO Unlicensed Transmission with 1-Bit Quantization. In: 2017 IEEE Globecom Workshops (GC Wkshps). IEEE Green open access

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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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