Overhead Constrained Joint Adaptation of MCS, Beamwidth and Antenna Sectors for 60 GHz WLANs with Mobile Clients

dc.contributor.advisorKnightly, Edward
dc.creatorHaider, Muhammad Kumail
dc.date.accessioned2018-03-23T13:29:55Z
dc.date.available2018-03-23T13:29:55Z
dc.date.created2015-12
dc.date.issued2015-10-27
dc.date.submittedDecember 2015
dc.date.updated2018-03-23T13:29:55Z
dc.description.abstractThe 60 GHz frequency band, with its 7 GHz wide unlicensed spectrum, opens up avenues to multi-Gigabit communication. However, the extremely short wavelength (on the order of a few millimeters) results in very high path loss and little diffraction or scattering. To extend range, directional antennas or electronically steerable beam-arrays are used to get directivity gain. This makes links in 60 GHz networks inherently directional and this directivity introduces new challenges in terms of communication link establishment and maintenance. First, the beamwidth of the directional antennas plays an important role in determining the maximum rate, unlike in omni-directional networks. Moreover, 60 GHz links are susceptible to breakage due to misalignment and blockage due to their highly directional nature. In this thesis, I have designed, implemented and evaluated a novel cross-layer protocol, BeamRAP, for adapting the beamwidth of directional antennas and the data rate at the physical layer jointly in 60 GHz directional networks. This joint adaptation is necessary since beamwidth and alignment of directional antennas, are the key determinants of link strength and thereby the data rates. Moreover, misalignment of directional antennas due to nodal mobility or link blockage due to environmental mobility cannot be addressed by existing rate adaptation protocols. Therefore, in BeamRAP, I have implemented a new algorithm for beamwidth adaptation in response to the frequency of blockage and misalignment events, to maximize link throughput. I have also introduced new mechanisms for link breakage detection, and fast recovery to restore links without exhaustive search over all antenna sectors. I have also developed a 60 GHz programmable node and testbed using VubIQ 60 GHz transceivers with WARP baseband, and have conducted an extensive measurement study to collect signal strength traces over-the-air for various LOS, reflection and antenna-misalignment scenario. My experiments under multiple environmental and nodal mobility scenario show that BeamRAP achieves up to 2x gains in throughput as compared to a baseline 802.11ad scheme, which does not implement beamwidth adaptation.
dc.format.mimetypeapplication/pdf
dc.identifier.citationHaider, Muhammad Kumail. "Overhead Constrained Joint Adaptation of MCS, Beamwidth and Antenna Sectors for 60 GHz WLANs with Mobile Clients." (2015) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/99726">https://hdl.handle.net/1911/99726</a>.
dc.identifier.urihttps://hdl.handle.net/1911/99726
dc.language.isoeng
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.subjectBeamforming
dc.subject60 GHz
dc.subjectDirectional Networks
dc.subjectJoint Adaptation
dc.titleOverhead Constrained Joint Adaptation of MCS, Beamwidth and Antenna Sectors for 60 GHz WLANs with Mobile Clients
dc.typeThesis
dc.type.materialText
thesis.degree.departmentElectrical and Computer Engineering
thesis.degree.disciplineEngineering
thesis.degree.grantorRice University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science
Files
Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
HAIDER-DOCUMENT-2015.pdf
Size:
1.44 MB
Format:
Adobe Portable Document Format
License bundle
Now showing 1 - 2 of 2
No Thumbnail Available
Name:
PROQUEST_LICENSE.txt
Size:
5.85 KB
Format:
Plain Text
Description:
No Thumbnail Available
Name:
LICENSE.txt
Size:
2.62 KB
Format:
Plain Text
Description: