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).


DOI
HAL
Type:
Conférence
City:
Istanbul
Date:
2013-07-07
Department:
Systèmes de Communication
Eurecom Ref:
4023
Copyright:
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PERMALINK : https://www.eurecom.fr/publication/4023