Graduate School and Research Center in Digital Sciences

Dual-regularized feedback and precoding for D2D-assisted MIMO systems

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

IEEE Transactions on Wireless Communications, Vol.16, N° 10, October 2017

This paper considers the problem of efficient feedback design for massive multiple-input multiple-output (MIMO) downlink transmissions in frequency division duplexing (FDD) bands, where some partial channel state information (CSI) can be directly exchanged between users via device-to-device (D2D) communications. Drawing inspiration from classical point-to-point MIMO, where efficient mechanisms are obtained by feeding back directly the precoder, this paper proposes a new approach to bridge the channel feedback and the precoder feedback by the joint design of the feedback and precoding strategy following a team decision framework. Specifically, the users and the base station (BS) minimize a common mean squared error (MSE) metric based on their individual observations on the imperfect global CSI. The solutions are found to take similar forms as the regularized zero-forcing (RZF) precoder, with additional regularizations that capture any level of uncertainty in the exchanged CSI, in case the D2D links are absent or unreliable. Numerical results demonstrate superior performance of the proposed scheme for an arbitrary D2D link quality setup.

Document Doi Bibtex

Title:Dual-regularized feedback and precoding for D2D-assisted MIMO systems
Keywords:MIMO, device-to-device, limited feedback, precoding, CSI exchange, FDD systems
Department:Communication systems
Eurecom ref:5341
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Bibtex: @article{EURECOM+5341, doi = {}, year = {2017}, month = {08}, title = {{D}ual-regularized feedback and precoding for {D}2{D}-assisted {MIMO} systems}, 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}° 10, {O}ctober 2017}, url = {} }
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