Spectral-efficiency of multi-antenna links in ad-hoc wireless networks with limited Tx CSI

Authors:
Siddhartan Govindasamy;Daniel W. Bliss;David H. Staelin
Affiliations:
Franklin W. Olin College of Engineering;MIT Lincoln Laboratory and Massachusetts Institute of Technology;Research Laboratory of Electronics, Massachusetts Institute of Technology
Venue:
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Year:
2009

Citing 6
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Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers

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Abstract

An asymptotic expression is derived for the mean spectral efficiency of multi-antenna links randomly distributed on a plane in a uniform manner where transmitters (Tx) have Channel-State-Information (CSI) of the channels between themselves and their target receivers while receivers (Rx) have CSI between themselves and all transmitters. The mean per-link spectral efficiency in the network is found to increase if nodes transmit using a subset of their strongest channel modes instead of the link-optimal strategy of water-filling on all channel modes (Farrokhi et al.). For reasonable parameters, this system which requires limited Tx CSI, has approximately double the mean spectral efficiency of systems without Tx CSI.