Graduate School and Research Center in Digital Sciences

Optimally bridging the gap from delayed to perfect CSIT in the K-user MISO BC

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

ITW 2016, IEEE Information Theory Workshop, September 11-14, 2016, Cambridge, UK

This work1 derives 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 channel estimation error scales in P−α for α ∈ [0, 1]. The optimal sum DoF takes the simple form (1 − α)K/HK + αK where HK≜ Σk=1K1/k. This optimal performance is the result of a novel scheme which deviates from existing efforts as it digitally combines interference, decodes symbols of any order in the MAT alignment [1], and utilizes a hierarchical quantizer whose output is distributed across rounds in a way that minimizes unwanted interference. These jointly deliver, for the first time, the elusive DoF-optimal combining of MAT and ZF.

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Title:Optimally bridging the gap from delayed to perfect CSIT in the K-user MISO BC
Department:Communication systems
Eurecom ref:4981
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Bibtex: @inproceedings{EURECOM+4981, doi = {}, year = {2016}, title = {{O}ptimally bridging the gap from delayed to perfect {CSIT} in the {K}-user {MISO} {BC}}, author = {de {K}erret, {P}aul and {G}esbert, {D}avid and {Z}hang, {J}ingjing and {E}lia, {P}etros}, booktitle = {{ITW} 2016, {IEEE} {I}nformation {T}heory {W}orkshop, {S}eptember 11-14, 2016, {C}ambridge, {UK}}, address = {{C}ambridge, {UNITED} {KINGDOM}}, month = {09}, url = {} }
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