Graduate School and Research Center in Digital Sciences

Degrees of freedom of time-correlated broadcast channels with delayed CSIT: The MIMO case

Yi, Xinping; Gesbert, David; Yang, S; Kobayashi, M

ISIT 2013, IEEE International Symposium on Information Theory, July 7-12, 2013, Istanbul, Turkey

The two-user Multiple-Input Multiple-Output (MIMO) broadcast channel (BC) with arbitrary antenna configuration is considered, in which the transmitter obtains (i) delayed channel state information (CSI) from a latency-prone feedback channel as well as (ii) imperfect current CSI, e.g., from prediction based on these past channel samples. The degrees of freedom (DoF) region under such a setting is fully characterized as a function of a prediction quality exponent. This work extends prior work, previously limited to MISO, to fully general antenna settings. An intriguing by-product of our results is to reveal the benefits of dealing with an asymmetric multi-user MIMO configuration (i.e., one in which terminals do not have the same number of antennas) in the case of non-perfect CSIT (e.g., caused by feedback delays or limited preciseness).

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Title:Degrees of freedom of time-correlated broadcast channels with delayed CSIT: The MIMO case
Type:Conference
Language:English
City:Istanbul
Country:TURKEY
Date:
Department:Communication systems
Eurecom ref:4023
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Bibtex: @inproceedings{EURECOM+4023, doi = {http://dx.doi.org/10.1109/ISIT.2013.6620374}, year = {2013}, title = {{D}egrees of freedom of time-correlated broadcast channels with delayed {CSIT}: {T}he {MIMO} case}, author = {{Y}i, {X}inping and {G}esbert, {D}avid and {Y}ang, {S} and {K}obayashi, {M}}, booktitle = {{ISIT} 2013, {IEEE} {I}nternational {S}ymposium on {I}nformation {T}heory, {J}uly 7-12, 2013, {I}stanbul, {T}urkey }, address = {{I}stanbul, {TURKEY}}, month = {07}, url = {http://www.eurecom.fr/publication/4023} }
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