Graduate School and Research Center in Digital Sciences

DoF region of the decentralized MIMO broadcast channel - How many informed antennas do we need?

Bazco-Nogueras, Antonio; Davoodi, Arash; de Kerret, Paul; Gesbert, David; Gresset, Nicolas; Jafar, Syed

ISIT 2020, IEEE International Symposium on Information Theory, 21-26 June 2020, Los Angeles, USA (Virtual Conference)

In this work, we study the impact of imperfect sharing of the Channel State Information (CSI) available at the transmitters on a Network MIMO setting in which a set of M transmit antennas, possibly not co-located, jointly serve two multiantenna users endowed with N1 and N2 antennas, respectively. We consider the case where only a subset of k transmit antennas have access to perfect CSI, whereas the other M - k transmit antennas have only access to finite precision CSI. The analysis of this configuration aims to answer the question of how much an extra informed antenna can help. We model this scenario as a Decentralized MIMO Broadcast Channel (BC) and characterize the Degrees-of-Freedom (DoF) region, showing that only k =max(N1;N2) antennas with perfect CSI are needed to achieve the DoF of the conventional BC with ubiquitous perfect CSI.

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Title:DoF region of the decentralized MIMO broadcast channel - How many informed antennas do we need?
City:Los Angeles
Department:Communication systems
Eurecom ref:6264
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Bibtex: @inproceedings{EURECOM+6264, year = {2020}, title = {{D}o{F} region of the decentralized {MIMO} broadcast channel - {H}ow many informed antennas do we need?}, author = {{B}azco-{N}ogueras, {A}ntonio and {D}avoodi, {A}rash and de {K}erret, {P}aul and {G}esbert, {D}avid and {G}resset, {N}icolas and {J}afar, {S}yed}, booktitle = {{ISIT} 2020, {IEEE} {I}nternational {S}ymposium on {I}nformation {T}heory, 21-26 {J}une 2020, {L}os {A}ngeles, {USA} ({V}irtual {C}onference)}, address = {{L}os {A}ngeles, {UNITED} {STATES}}, month = {06}, url = {} }
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