Non-orthogonal transmission in multi-user systems with Grassmannian beamforming

Handle URI:
http://hdl.handle.net/10754/564385
Title:
Non-orthogonal transmission in multi-user systems with Grassmannian beamforming
Authors:
Xia, Minghua; Wu, Yikchung; Aissa, Sonia
Abstract:
Aiming to achieve the sum-rate capacity in multiuser multi-input multi-output (MIMO) channels with N t antennas implemented at the transmitter, opportunistic beamforming (OBF) generates N t orthonormal beams and serves N t users during each transmission, which results in high scheduling delay over the users, especially in densely populated wireless networks. Non-orthogonal OBF with more than N t transmit beams can be exploited to serve more users simultaneously and further decreases scheduling delay. However, the inter-beam interference will inevitably deteriorate the sum-rate. Therefore, there is a tradeoff between the sum-rate and the increasing number of transmit beams. In this context, the sum-rate of non-orthogonal OBF with N > N t beams are studied, where the transmitter is based on the Grassmannian beamforming. Our results show that non-orthogonal OBF is an interference-limited system. Moreover, when the inter-beam interference reaches its minimum for fixed N t and N, the sum-rate scales as N ln (N/N-N t) and it decreases monotonically with N for fixed N t. Numerical results corroborate the accuracy of our analyses. © 2011 IEEE.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Publisher:
Institute of Electrical and Electronics Engineers (IEEE)
Journal:
2011 IEEE International Conference on Communications (ICC)
Conference/Event name:
2011 IEEE International Conference on Communications, ICC 2011
Issue Date:
Jun-2011
DOI:
10.1109/icc.2011.5962841
Type:
Conference Paper
ISSN:
05361486
ISBN:
9781612842332
Appears in Collections:
Conference Papers; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorXia, Minghuaen
dc.contributor.authorWu, Yikchungen
dc.contributor.authorAissa, Soniaen
dc.date.accessioned2015-08-04T06:25:44Zen
dc.date.available2015-08-04T06:25:44Zen
dc.date.issued2011-06en
dc.identifier.isbn9781612842332en
dc.identifier.issn05361486en
dc.identifier.doi10.1109/icc.2011.5962841en
dc.identifier.urihttp://hdl.handle.net/10754/564385en
dc.description.abstractAiming to achieve the sum-rate capacity in multiuser multi-input multi-output (MIMO) channels with N t antennas implemented at the transmitter, opportunistic beamforming (OBF) generates N t orthonormal beams and serves N t users during each transmission, which results in high scheduling delay over the users, especially in densely populated wireless networks. Non-orthogonal OBF with more than N t transmit beams can be exploited to serve more users simultaneously and further decreases scheduling delay. However, the inter-beam interference will inevitably deteriorate the sum-rate. Therefore, there is a tradeoff between the sum-rate and the increasing number of transmit beams. In this context, the sum-rate of non-orthogonal OBF with N > N t beams are studied, where the transmitter is based on the Grassmannian beamforming. Our results show that non-orthogonal OBF is an interference-limited system. Moreover, when the inter-beam interference reaches its minimum for fixed N t and N, the sum-rate scales as N ln (N/N-N t) and it decreases monotonically with N for fixed N t. Numerical results corroborate the accuracy of our analyses. © 2011 IEEE.en
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)en
dc.titleNon-orthogonal transmission in multi-user systems with Grassmannian beamformingen
dc.typeConference Paperen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journal2011 IEEE International Conference on Communications (ICC)en
dc.conference.date5 June 2011 through 9 June 2011en
dc.conference.name2011 IEEE International Conference on Communications, ICC 2011en
dc.conference.locationKyotoen
dc.contributor.institutionDepartment of Electrical and Electronic Engineering, University of Hong Kong, Hong Kong, Hong Kongen
dc.contributor.institutionINRS-EMT, University of Quebec, Montreal, QC, Canadaen
kaust.authorXia, Minghuaen
kaust.authorAissa, Soniaen
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