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Conference Papers Year : 2016

Optimally Bridging the Gap from Delayed to Perfect CSIT in the K-user MISO BC

Paul de Kerret
David Gesbert
Jingjing Zhang
Petros Elia

Abstract

This work 1 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 K k=1 1 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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Dates and versions

hal-03560312 , version 1 (07-02-2022)

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Paul de Kerret, David Gesbert, Jingjing Zhang, Petros Elia. Optimally Bridging the Gap from Delayed to Perfect CSIT in the K-user MISO BC. ITW 2016, IEEE Information Theory Workshop, Sep 2016, Cambridge, United Kingdom. pp.300-304, ⟨10.1109/ITW.2016.7606844⟩. ⟨hal-03560312⟩

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