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Degrees of Freedom of Time- Correlated Broadcast Channels with Delayed CSIT: The MIMO Case

Abstract : 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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https://hal-supelec.archives-ouvertes.fr/hal-00827768
Contributor : Catherine Magnet <>
Submitted on : Wednesday, May 29, 2013 - 4:44:59 PM
Last modification on : Tuesday, September 8, 2020 - 12:36:06 PM

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X. Yi, David Gesbert, Sheng Yang, Mari Kobayashi. Degrees of Freedom of Time- Correlated Broadcast Channels with Delayed CSIT: The MIMO Case. 2013 IEEE International Symposium on Information Theory, Jul 2013, Istanbul, Turkey. ⟨10.1109/ISIT.2013.6620374⟩. ⟨hal-00827768⟩

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