DocumentCode :
2763268
Title :
MU-MIMO Decomposition Transmission with Limited Feedback
Author :
Wang, Cheng ; Murch, Ross D.
Author_Institution :
Dept. of Electron. & Comput. Eng., Hong Kong Univ. of Sci. & Technol.
fYear :
2007
fDate :
11-15 March 2007
Firstpage :
1108
Lastpage :
1113
Abstract :
Downlink multi-user multiple-input multiple-output (MU-MIMO) transmission techniques have gained much attention recently because of their potential to significantly increase system capacity compared to single-user transmission by separating multiple users in the space domain through appropriate signal processing. Unfortunately, these techniques require accurate channel state information at the transmitter (CSIT) for their proper operation. In practice however perfect CSIT is hard to obtain due to capacity-limited feedback channel in FDD systems for example. In this paper we investigate systems employing MU-MIMO decomposition transmission in the downlink with limited feedback. In particular, the essential information that enables the scheme to deal with inter-user interference is identified and the optimal codebook design in terms of minimizing the residual inter-user interference power is derived. Simulation results show that in general limited feedback has a significant impact on the mutual information achieved by MU-MIMO decomposition transmission.
Keywords :
MIMO communication; multiuser channels; radiofrequency interference; MU-MIMO decomposition transmission techniques; limited feedback; multiuser multiple-input multiple-output transmission techniques; optimal codebook design; residual inter-user interference power; Channel state information; Downlink; Feedback; Interference; MIMO; Signal design; Signal processing; Space technology; Transmitters; Transmitting antennas;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Wireless Communications and Networking Conference, 2007.WCNC 2007. IEEE
Conference_Location :
Kowloon
ISSN :
1525-3511
Print_ISBN :
1-4244-0658-7
Electronic_ISBN :
1525-3511
Type :
conf
DOI :
10.1109/WCNC.2007.210
Filename :
4224455
Link To Document :
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