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dc.contributor.authorSacristán Murga, Daniel
dc.contributor.authorPascual Iserte, Antonio
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions
dc.identifier.citationSacristán Murga, D., Pascual Iserte, A. Differential Feedback of MIMO Channel Gram Matrices Based on Geodesic Curves. "IEEE transactions on wireless communications", Desembre 2010, vol. 9, núm. 12, p. 3714-3727.
dc.description.abstractThis paper proposes a differential quantization strategy to be used in the feedback link of a multiple-input multiple-output (MIMO) communication system. This algorithm is applied to the channel Gram matrix using geodesic curves and exploiting the intrinsic geometry of positive definite Hermitian matrices. It also exploits the temporal correlation of the channel, and follows on average the gradient of the cost function associated to the transmitter design criterion. A full description of the algorithm, including the computational cost and a numerical analysis of the effect of delays and errors in the feedback link is presented. Simulation results show that the proposed algorithm improves other techniques based on the direct quantization of the channel response matrix or the quantization of the subspace spanned by the strongest eigenmodes of the MIMO channel, i.e., Grassmannian based techniques. The main drawback of Grassmannian based algorithms is that the transmitter is constrained to apply a uniform power allocation among spatial transmission modes, which is not forced in the algorithm proposed in this paper.
dc.format.extent14 p.
dc.subjectÀrees temàtiques de la UPC::Enginyeria de la telecomunicació
dc.subject.lcshMIMO systems
dc.subject.lcshGeometry, Differencial
dc.subject.otherMIMO systems
dc.subject.otherDifferential geometry
dc.subject.otherFeedback communication
dc.subject.otherFeedback delay
dc.subject.otherFeedback errors
dc.subject.otherGrassmannian packaging
dc.titleDifferential Feedback of MIMO Channel Gram Matrices Based on Geodesic Curves
dc.subject.lemacSistemes MIMO
dc.subject.lemacGeometria diferencial
dc.contributor.groupUniversitat Politècnica de Catalunya. A&MP - Grup de Processament d'Arrays i Sistemes Multicanal
dc.description.peerreviewedPeer Reviewed
dc.rights.accessRestricted access - publisher's policy
dc.description.versionPostprint (published version)
dc.relation.projectidinfo:eu-repo/grantAgreement/EC/FP7/216715/EU/NEtwork of Excellence in Wireless COMmunications++ (NEWCOM++)/NEWCOM++
dc.relation.projectidinfo:eu-repo/grantAgreement/EC/FP7/248267/EU/Beyond Next Generation Mobile Broadband/BUNGEE
upcommons.citation.authorSacristán Murga, D., Pascual Iserte, A.
upcommons.citation.publicationNameIEEE transactions on wireless communications

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