Graduate School and Research Center in Digital Sciences

The DoF of network MIMO with backhaul delays

Yi, Xinping; de Kerret, Paul; Gesbert, David

ICC 2013, IEEE International Conference on Communications June 9-13, 2013, Budapest, Hungary / Also published on arXiv: 1210.5470

We consider the problem of downlink precoding for Network (multi-cell) MIMO networks where Transmitters (TXs) are provided with imperfect Channel State Information (CSI). Specifically, each TX receives a delayed channel estimate with the delay being specific to each channel component. This model is particularly adapted to the scenarios where a user feeds back its CSI to its serving base only as it is envisioned in future LTE networks. We analyze the impact of the delay during the backhaul-based CSI exchange on the rate performance achieved by Network MIMO. We highlight how delay can dramatically degrade system performance if existing precoding methods are to be used. We propose an alternative robust beamforming strategy which achieves the maximal performance, in DoF sense.We verify by simulations that the theoretical DoF improvement translates into a performance increase at finite Signal-to-Noise Ratio (SNR) as well.

Document Doi Arxiv Bibtex

Title:The DoF of network MIMO with backhaul delays
Department:Communication systems
Eurecom ref:3952
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Bibtex: @inproceedings{EURECOM+3952, doi = {}, year = {2013}, title = {{T}he {D}o{F} of network {MIMO} with backhaul delays}, author = {{Y}i, {X}inping and de {K}erret, {P}aul and {G}esbert, {D}avid}, booktitle = {{ICC} 2013, {IEEE} {I}nternational {C}onference on {C}ommunications {J}une 9-13, 2013, {B}udapest, {H}ungary / {A}lso published on ar{X}iv: 1210.5470}, address = {{B}udapest, {HUNGARY}}, month = {06}, url = {} }
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