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

On the trade-off between feedback and capacity in measured MU-MIMO channels

Kaltenberger, Florian; Kountouris, Marios; Gesbert, David; Knopp, Raymond

IEEE Transactions on Wireless Communications, Volume 8, N°9, September 2009

In this work we study the capacity of multi-user multiple-input multiple-output (MU-MIMO) downlink channels with codebook-based limited feedback using real measurement data. Several aspects of MU-MIMO channels are evaluated. Firstly, we compare the sum rate of different MU-MIMO precoding schemes in various channel conditions. Secondly, we study the effect of different codebooks on the performance of limited feedback MU-MIMO. Thirdly, we relate the required feedback rate with the achievable rate on the downlink channel. Real multi-user channel measurement data acquired with the Eurecom MIMO OpenAir Sounder (EMOS) is used. To the best of our knowledge, these are the first measurement results giving evidence of how MU-MIMO precoding schemes depend on the precoding scheme, channel characteristics, user separation, and codebook. For example, we show that having a large user separation as well as codebooks adapted to the second order statistics of the channel gives a sum rate close to the theoretical limit. A small user separation due to bad scheduling or a poorly adapted codebook on the other hand can impair the gain brought by MU-MIMO. The tools and the analysis presented in this paper allow the system designer to trade-off downlink rate with feedback rate by carefully choosing the codebook.

Document Doi Hal Bibtex

Titre:On the trade-off between feedback and capacity in measured MU-MIMO channels
Mots Clés: Multi-user MIMO systems, channel sounding, information rates, limited feedback, radio propagation
Département:Systèmes de Communication
Eurecom ref:2817
Copyright: © 2009 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Bibtex: @article{EURECOM+2817, doi = {}, year = {2009}, month = {09}, title = {{O}n the trade-off between feedback and capacity in measured {MU}-{MIMO} channels}, author = {{K}altenberger, {F}lorian and {K}ountouris, {M}arios and {G}esbert, {D}avid and {K}nopp, {R}aymond}, journal = {{IEEE} {T}ransactions on {W}ireless {C}ommunications, {V}olume 8, {N}°9, {S}eptember 2009}, url = {} }
Voir aussi: