DocumentCode :
640039
Title :
On the fundamental feedback-vs-performance tradeoff over the MISO-BC with imperfect and delayed CSIT
Author :
Jinyuan Chen ; Sheng Yang ; Elia, Petros
Author_Institution :
Mobile Commun. Dept., EURECOM, Sophia Antipolis, France
fYear :
2013
fDate :
7-12 July 2013
Firstpage :
997
Lastpage :
1001
Abstract :
This work considers the multiuser multiple-input single-output (MISO) broadcast channel (BC), where a transmitter with M antennas transmits information to K single-antenna users, and where - as expected - the quality and timeliness of channel state information at the transmitter (CSIT) is imperfect. Motivated by the fundamental question of how much feedback is necessary to achieve a certain performance, this work seeks to establish bounds on the tradeoff between degrees-of-freedom (DoF) performance and CSIT feedback quality. Specifically, this work provides a novel DoF region outer bound for the general K-user M ×1 MISO BC with partial current CSIT, which naturally bridges the gap between the case of having no current CSIT (only delayed CSIT, or no CSIT) and the case with full CSIT. The work then characterizes the minimum CSIT feedback that is necessary for any point of the sum DoF, which is optimal for the case with M ≥ K, and the case with M = 2, K = 3.
Keywords :
broadcast channels; CSIT feedback quality; MISO-BC; channel state information at the transmitter; degrees-of-freedom performance; fundamental feedback; multiuser multiple-input single-output broadcast channel; novel DoF region outer bound; performance tradeoff; Channel state information; Coherence; Current measurement; Electronic mail; Transmitters; Vectors;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Information Theory Proceedings (ISIT), 2013 IEEE International Symposium on
Conference_Location :
Istanbul
ISSN :
2157-8095
Type :
conf
DOI :
10.1109/ISIT.2013.6620376
Filename :
6620376
Link To Document :
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