DocumentCode :
2992861
Title :
Outage efficient strategies for network MIMO with partial CSIT
Author :
Kobayashi, Mari ; Debbah, Mérouane ; Belfiore, Jean-Claude
Author_Institution :
SUPELEC, Gif-sur-Yvette, France
fYear :
2009
fDate :
June 28 2009-July 3 2009
Firstpage :
249
Lastpage :
253
Abstract :
We consider a multi-cell MIMO downlink (network MIMO) where B base-stations (BS) with M antennas, connected to a central station (CS), transmit K messages to K single-antenna user terminals (UT) simultaneously. Although many works have shown the potential benefits of network MIMO, the conclusion critically depends on the underlying assumption of perfect channel state information at transmitters (CSIT). In this paper, we propose an outage-efficient strategy that requires only partial CSIT. Namely, with side information of all UT´s messages and local CSIT, each BS applies zero-forcing (ZF) beamforming in a distributed manner, which creates K parallel MISO channels. Based on the statistical knowledge of these parallel channels, the CS performs a robust power allocation that jointly minimizes the outage probability of K UTs and achieves a diversity gain of B(M - K + 1) per UT. Numerical results show that even with partial CSIT network MIMO can be beneficial by providing high data rates with a sufficient reliability to individual users.
Keywords :
MIMO communication; array signal processing; diversity reception; probability; wireless channels; base-stations; central station; channel state information; diversity gain; multicell MIMO downlink; parallel MISO channels; partial CSIT; power allocation; probability; zero-forcing beamforming; Array signal processing; Channel state information; Downlink; Interference channels; MIMO; Robustness; Spine; Telecommunications; Transmitters; Transmitting antennas;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Information Theory, 2009. ISIT 2009. IEEE International Symposium on
Conference_Location :
Seoul
Print_ISBN :
978-1-4244-4312-3
Electronic_ISBN :
978-1-4244-4313-0
Type :
conf
DOI :
10.1109/ISIT.2009.5206071
Filename :
5206071
Link To Document :
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