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Beamwidth Selection for a Uniform Planar Array (UPA) Using RT-ICM mmWave Clusters

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Document pages: 7 pages

Abstract: Beamforming is the primary technology to overcome the high path loss inmillimeter-wave (mmWave) channels. Hence, performance improvement needsknowledge and control of the spatial domain. In particular, antenna structureand radiation parameters affect the beamforming performance in mmWavecommunications systems. In order to address the impairments such as beammisalignments, outage loss, tracking inability, blockage, etc., an optimumvalue of the beamwidth must be determined. In our previous paper, assuming acommunication system that creates a beam per cluster, we theoreticallyinvestigated the beamwidth-received power relation in the cluster level mmWavechannels. We used uniform linear array (ULA) antenna in our analysis. In thispaper, we revisit the analysis and update the expressions for the scenariowhere we use rectangular uniform planar array (R-UPA) antenna. Rectangular beammodel is considered to approximate the main lobe pattern of the antenna. Forthe channel, we derive beamwidth-dependent extracted power expressions for twointra-cluster channel models, IEEE 802.11ad and our previous work based onray-tracing (RT-ICM). Combining antenna and channel gains, in case of theperfect alignment, we confirm that the optimum beamwidth converges zero.Performing asymptotic analysis of the received power, we give the formulationand insights that the practical nonzero beamwidth values can be achievedalthough sacrificing subtle from the maximum received power. Our analysis showsthat to reach 95 of the maximum power for a typical indoor mmWave cluster, apractical beamwidth of 3.5 deg is enough. Finally, our analysis results showthat there is a 13 dB increase in the maximum theoretical received power whenUPA is used over ULA. We show that an 8 x 8 UPA can reach 50 of that maximumreceived power while the received power is still 10 dB larger than the ULAscenario.

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