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Analysis of off-the-shelf Millimeter Wave Systems with Phased Antenna Arrays

Bielsa, Guillermo (2016) Analysis of off-the-shelf Millimeter Wave Systems with Phased Antenna Arrays. Masters thesis, Universidad Carlos III de Madrid, Spain.

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The performance of current consumer-grade devices for 60 GHz wireless networks is limited. While such networks promise both high data rates and uncomplicated spatial reuse, we find that commercially available devices based on the WiHD and WiGig standards may suffer from their cost-effective design. Very similar mechanisms are used in upcoming devices based on the IEEE 802.11ad standard. Hence, understanding them well is crucial to improve the efficiency and performance of next generation millimeter wave networks. In this paper, we present the first in-depth beamforming, interference, and frame level protocol analysis of off-the-shelf millimeter wave systems with phased antenna arrays. We focus on (a) the interference due to the lack of directionality of consumer-grade antennas, and (b) the degree of data aggregation of current devices. Regarding (a), our beam pattern measurements show strong side lobes that challenge the common conception of high spatial reuse in 60 GHz networks. We also show that reflections in realistic settings worsen this effect. Further, we measure weak directionality when beamforming towards the boundary of the transmission area of an antenna array. Regarding (b), we observe that devices only aggregate data if connections require high bandwidth, thus increasing medium usage time otherwise.

Item Type: Theses (Masters)
Additional Information: This Master Thesis presents the paper ‘Boon and Bane of 60 GHz Networks: Practical Insights into Beamforming, Interference, and Frame Level Operation’ written by Thomas Nitsche, Guillermo Bielsa, Irene Tejado, Adrian Loch and Joerg Widmer. This paper was published in the conference ACM CoNEXT 2015, which took place at Heidelberg, Germany in December 2015. The student was heavily involved in all the measurement campaigns presented in this work, including processing and writing the documentation about them. This makes possible for the student to present this work as his Master Thesis.
Depositing User: Guillermo Bielsa
Date Deposited: 27 Jul 2016 10:48
Last Modified: 27 Jul 2016 10:48

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