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Sensors 2018, 18(2), 528; doi:10.3390/s18020528

Hybrid Beamforming for Reduction of Inter-Beam Interference in Millimeter-Wave Cellular Systems

School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 06974, Korea
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Received: 18 November 2017 / Revised: 2 February 2018 / Accepted: 7 February 2018 / Published: 9 February 2018
(This article belongs to the Section Sensor Networks)
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Abstract

In millimeter-wave (mm-wave) cellular systems, beamforming antennas are necessary at both the base station (BS) and mobile station (MS) to compensate for high attenuation in mm-wave frequency bands and to extend the transmission range. The beamforming antennas also allow each BS to serve a number of MSs simultaneously, providing a substantial gain in system capacity. In space-division multiple access (SDMA) systems, the challenge is the inter-beam interference (IBI) caused by adjacent beams that are formed by the BS in the same cell and BSs in neighboring cells. The beams that are formed toward MSs in each cell may generate significant interference to MSs in neighboring cells, especially for MSs at the cell boundary. In this paper, we propose four different digital precoding techniques (Type-1, Type-2, Type-3, and Type-4) to reduce IBI in mm-wave cellular systems with a hybrid beamformer. Simulation results show that the proposed techniques can reduce the IBI in mm-wave cellular systems effectively, compared with a single-cell multiuser case. View Full-Text
Keywords: millimeter-wave; cellular system; hybrid beamforming; multicell multiuser; inter-beam interference millimeter-wave; cellular system; hybrid beamforming; multicell multiuser; inter-beam interference
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MDPI and ACS Style

Maeng, S.J.; Park, S.H.; Cho, Y.S. Hybrid Beamforming for Reduction of Inter-Beam Interference in Millimeter-Wave Cellular Systems. Sensors 2018, 18, 528.

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