DocumentCode :
2812725
Title :
Random Beamforming with Systematic Beam Selection
Author :
Wagner, Jörg ; Liang, Ying-Chang ; Zhang, Rui
Author_Institution :
Inst. for Infocomm Res.
fYear :
2006
fDate :
11-14 Sept. 2006
Firstpage :
1
Lastpage :
5
Abstract :
In this paper, we propose a new random beamforming scheme for multiuser multiple-input single-output block fading channels, e.g., a wireless downlink in a cellular communication system. Unlike previous methods it achieves spatial multiplexing gain over the complete range of realistic signal-to-noise ratios (SNRs) even for moderate user numbers. The main shortcoming of the random beamforming schemes for multiple datastreams proposed so far is their interference limitation, especially under medium and high SNR. The key to mitigate this problem in our scheme is to allow feedback of each user´s channel gain in each random beam. This information suffices to determine the sum-rate maximizing subset of beams and users at the base station. In this sense, our scheme, referred to as orthonormal random beamforming with systematic beam selection, can be considered as optimal among all random beamforming schemes that do not make use of additional preprocessing at the transmitter (apart from power normalization). It achieves a significant performance gain compared to previous schemes particularly for realistic SNR values
Keywords :
cellular radio; fading channels; multiplexing; multiuser channels; radio links; SNR; cellular communication system; multiuser multiple-input single-output block fading channels; orthonormal random beamforming scheme; signal-to-noise ratios; spatial multiplexing gain; systematic beam selection; wireless downlink; Array signal processing; Base stations; Brillouin scattering; Downlink; Fading; Feedback; Interference; Land mobile radio; Mobile communication; Signal to noise ratio;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2006 IEEE 17th International Symposium on
Conference_Location :
Helsinki
Print_ISBN :
1-4244-0329-4
Electronic_ISBN :
1-4244-0330-8
Type :
conf
DOI :
10.1109/PIMRC.2006.253936
Filename :
4022548
Link To Document :
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