UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

DFT-based Hybrid Beamforming Multiuser Systems: Rate Analysis and Beam Selection

Han, Y; Jin, S; Zhang, J; Zhang, J; Wong, KK; (2018) DFT-based Hybrid Beamforming Multiuser Systems: Rate Analysis and Beam Selection. IEEE Journal on Selected Topics in Signal Processing , 12 (3) pp. 514-528. 10.1109/JSTSP.2018.2821104. Green open access

[img]
Preview
Text
AnalogBeamSelection.pdf - Accepted version

Download (875kB) | Preview

Abstract

This paper considers the discrete Fourier transform (DFT) based hybrid beamforming multiuser system and studies the use of analog beam selection schemes. We first analyze the uplink ergodic achievable rates of the zero-forcing (ZF) receiver and the maximum-ratio combining (MRC) receiver under Ricean fading conditions. We then examine the downlink ergodic achievable rates for the ZF and maximum-ratio transmitting (MRT) precoders. The long-term and short-term normalization methods are introduced, which utilize long-term and instantaneous channel state information (CSI) to implement the downlink power normalization, respectively. Also, approximations and asymptotic expressions of both the uplink and downlink rates are obtained, which facilitate the analog beam selection solutions to maximize the achievable rates. An exhaustive search provides the optimal results but to reduce the time-consumption, we resort to the derived rate limits and propose the second selection scheme based on the projected power of the line-of-sight (LoS) paths. We then combine the advantages of the two schemes and propose a two-step scheme that achieves near optimal performances with much less time-consumption than exhaustive search. Numerical results confirm the analytical results of the ergodic achievable rate and reveal the effectiveness of the proposed two-step method.

Type: Article
Title: DFT-based Hybrid Beamforming Multiuser Systems: Rate Analysis and Beam Selection
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/JSTSP.2018.2821104
Publisher version: https://doi.org/10.1109/JSTSP.2018.2821104
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: Hybrid beamforming,DFT beams, beam selection, ergodic achievable rates, multiuser transmission
UCL classification: 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/10048637
Downloads since deposit
99Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item