Ecole d'ingénieur et centre de recherche en Sciences du numérique

Optimal DoF of the K-User broadcast channel with delayed and imperfect current CSIT

de Kerret, Paul; Gesbert, David; Zhang, Jingjing; Elia, Petros

Submitted to IEEE Transaction on Information Theory, Parts of these results have been published in IEEE Information Theory Workshop 2016, Cambridge

This work studies the optimal Degrees-of-Freedom (DoF) of the K-User MISO Broadcast Channel (BC) with delayed Channel-State Information at the Transmitter (CSIT) and with additional current noisy CSIT where the current channel estimation error scales in~P−α for α∈[0,1]. This papers establishes for the first time the optimal DoF in this setting thanks to a new transmission scheme which achieves the elusive DoF-optimal combining of the Maddah-Ali and Tse scheme (MAT) introduced in their seminal work in 2010 with Zero-Forcing (ZF) for an arbitrary number of users. The derived sum DoF takes the surprisingly simple form (1−α)K/HK+αK where HK≜∑Kk=11k is the sum-DoF achieved using solely MAT.

Document Arxiv Bibtex

Titre:Optimal DoF of the K-User broadcast channel with delayed and imperfect current CSIT
Type:Journal
Langue:English
Ville:
Date:
Département:Systèmes de Communication
Eurecom ref:4880
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Bibtex: @article{EURECOM+4880, year = {2016}, month = {11}, title = {{O}ptimal {D}o{F} of the {K}-{U}ser broadcast channel with delayed and imperfect current {CSIT}}, author = {de {K}erret, {P}aul and {G}esbert, {D}avid and {Z}hang, {J}ingjing and {E}lia, {P}etros}, journal = {{S}ubmitted to {IEEE} {T}ransaction on {I}nformation {T}heory, {P}arts of these results have been published in {IEEE} {I}nformation {T}heory {W}orkshop 2016, {C}ambridge }, url = {http://www.eurecom.fr/publication/4880} }
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