Graduate School and Research Center in Digital Sciences

Generalized degrees-of-freedom of the 2-user case MISO broadcast channel with distributed CSIT

Bazco, Antonio; de Kerret, Paul; Gesbert, David; Gresset, Nicolas

ISIT 2017, IEEE International Symposium on Information Theory, June 25-30, 2017, Aachen, Germany

This work1 analyses the Generalized Degrees-of-Freedom (GDoF) of the 2-User Multiple-Input Single-Output (MISO) Broadcast Channel (BC) in the so-called Distributed CSIT regime, with application to decentralized wireless networks. This regime differs from the classical limited CSIT one in that the CSIT is not just noisy but also imperfectly shared across the transmitters (TXs). Hence, each TX precodes data on the basis of local CSIT and statistical quality information at other TXs. We derive the GDoF result and obtain the surprising outcome that by specific accounting of the pathloss information, it becomes possible for the decentralized precoded network to reach the same performance as a genieaided centralized network where the central node has obtained the estimates of both TXs. The key ingredient in the scheme is the so-called Active-Passive Zero-Forcing (AP-ZF) precoding, which lets the precoder design adapt optimally with respect to different local CSIT qualities available at different TXs.

Document Doi Arxiv Bibtex

Title:Generalized degrees-of-freedom of the 2-user case MISO broadcast channel with distributed CSIT
Department:Communication systems
Eurecom ref:5140
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Bibtex: @inproceedings{EURECOM+5140, doi = {}, year = {2017}, title = {{G}eneralized degrees-of-freedom of the 2-user case {MISO} broadcast channel with distributed {CSIT}}, author = {{B}azco, {A}ntonio and de {K}erret, {P}aul and {G}esbert, {D}avid and {G}resset, {N}icolas}, booktitle = {{ISIT} 2017, {IEEE} {I}nternational {S}ymposium on {I}nformation {T}heory, {J}une 25-30, 2017, {A}achen, {G}ermany}, address = {{A}achen, {GERMANY}}, month = {06}, url = {} }
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