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

Feedback mechanisms for FDD massive MIMO with D2D-based limited CSI sharing

Chen, Junting; Yin, Haifan; Cottatellucci, Laura; Gesbert, David

IEEE Transactions on Wireless Communications, Vol.16, N°8, August 2017

Channel state information (CSI) feedback is a challenging issue in frequency division multiplexing (FDD) massive MIMO systems. This paper studies a cooperative feedback scheme, where the users first exchange their CSI with each other by exploiting device-to-device (D2D) communications, then compute the precoder by themselves, and feed back the precoder to the base station (BS). Analytical results are derived to show that the cooperative precoder feedback is more efficient than the CSI feedback in terms of interference mitigation. Under the constraint of limited D2D communication capacity, we develop an adaptive CSI exchange strategy based on signal subspace projection and optimal bit partition. Numerical results demonstrate that the proposed cooperative precoder feedback scheme with adaptive CSI exchange significantly outperforms the CSI feedback scheme, even when the CSI is exchanged via rate-limited D2D communications.

Document Doi Arxiv Bibtex

Titre:Feedback mechanisms for FDD massive MIMO with D2D-based limited CSI sharing
Mots Clés:Massive MIMO, device-to-device, limited feedback, precoder feedback, subspace projection
Département:Systèmes de Communication
Eurecom ref:5063
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Bibtex: @article{EURECOM+5063, doi = {}, year = {2017}, month = {05}, title = {{F}eedback mechanisms for {FDD} massive {MIMO} with {D}2{D}-based limited {CSI} sharing}, author = {{C}hen, {J}unting and {Y}in, {H}aifan and {C}ottatellucci, {L}aura and {G}esbert, {D}avid}, journal = {{IEEE} {T}ransactions on {W}ireless {C}ommunications, {V}ol.16, {N}°8, {A}ugust 2017}, url = {} }
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