NDLI: Spectral efficiency limits in pilot-assisted cooperative communications

Content Provider	IEEE Xplore Digital Library
Author	Lozano, A. Andrews, J.G. Heath, R.W.
Copyright Year	2012
Description	Author affiliation: Department of Electrical and Computer Eng., The University of Texas at Austin, Austin, TX 78712 (Andrews, J.G.; Heath, R.W.) \|\| Dept. of Information and Communication Technologies, Universitat Pompeu Fabra (UPF), 08018 Barcelona, Spain (Lozano, A.)
Abstract	Cooperation in a large wireless network with pilotassisted coherent communication is shown to have certain fundamental limitations, namely that even perfect cooperation cannot in general change an interference-limited network to a noise-limited one. Specifically, we demonstrate the existence of a spectral efficiency upper bound that does not grow with the transmit power, when channels are estimated via pilot signals. This is because pilot-assisted channel estimation is only possible within finite cooperation clusters, resulting in out-of-cluster interference that scales with the transmit power. Making the clusters excessively large can actually worsen this effect, nor does sidestepping the pilot-assisted channel estimation via noncoherent demodulation provide an escape. Using a cellular system as an example, it is demonstrated that the spectral efficiency saturates at power levels of operational relevance, indicating that the lackluster gains from cooperation observed in practice may be based on fundamental information-theoretic limitations, rather than current technology imperfections.
Starting Page	1132
Ending Page	1136
File Size	166952
Page Count	5
File Format	PDF
ISBN	9781467325806
ISSN	21578117
e-ISBN	9781467325790
e-ISBN	9781467325783
DOI	10.1109/ISIT.2012.6283030
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-07-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Interference Channel estimation Receivers Fading Transmitters Signal to noise ratio MIMO
Content Type	Text
Resource Type	Article

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