Throughput optimization in MU-MIMO systems via exploiting bs antenna tilt
Paper i proceeding, 2012

In this paper, we propose a novel framework to enhance the throughput in a single-cell multiuser multiple-input multiple-output (MU-MIMO) system via adaptive base station (BS) antenna tilting. The key idea is to partition the cell into so-called vertical regions and to apply one out of a finite number of tilt and vertical half-power beamwidth (HPBW) pairs at the BS when serving each vertical region. This strategy results in an increased average received signal-to-noise ratio (SNR) over the coverage area. A scheduler is then employed to schedule the transmission to one of the vertical regions at each time-slot with the objective to maximize a suitable utility function of users' achievable throughput. MU-MIMO zero-forcing beamforming in the horizontal plane is used at the BS to serve the users in each vertical region. Simulation results show that the proposed adaptive BS tilting scheme is a promising approach to provide a noticeable throughput gain compared to a conventional scheme employing a fixed tilt at the BS. The proposed framework also achieves a superior performance-complexity tradeoff compared to a conventional system in which the tilt can be adapted to the location of the served users at each time-slot.

downlink

throughput

MIMO

Antenna tilt

fairness scheduling

Författare

Nima Seifi

Chalmers, Signaler och system, Kommunikationssystem, informationsteori och antenner, Kommunikationssystem

Mikael Coldrey

Chalmers, Signaler och system, Signalbehandling och medicinsk teknik, Signalbehandling

Tommy Svensson

Chalmers, Signaler och system, Kommunikationssystem, informationsteori och antenner, Kommunikationssystem

2012 IEEE Globecom Workshops, GC Wkshps 2012

653-657

Ämneskategorier

Elektroteknik och elektronik

DOI

10.1109/GLOCOMW.2012.6477651

ISBN

978-146734941-3