From Spectrum Pooling to Space Pooling: Opportunistic Interference Alignment in MIMO Cognitive Networks
Name
Perlaza-2010-From Spectrum Poolin.pdf
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1.1 MB
Format
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Checksum (MD5)
4ac2227a3dd4a685debe307e5009328a
Author(s)
Perlaza, Samir M.
Fawaz, Nadia
Lasaulce, Samson
Debbah, Merouane
Date Issued
July 2010
Journal
IEEE Transactions on Signal Processing
Publisher
Institute of Electrical and Electronics Engineers
Citation
Perlaza, Samir M. et al. “From Spectrum Pooling to Space Pooling: Opportunistic Interference Alignment in MIMO Cognitive Networks.” IEEE Transactions on Signal Processing 58.7 (2010): 3728–3741. Web.© 2010 IEEE.
Version
Final published version
Abstract
We describe a noncooperative interference alignment (IA) technique which allows an opportunistic multiple input multiple output (MIMO) link (secondary) to harmlessly coexist with another MIMO link (primary) in the same frequency band. Assuming perfect channel knowledge at the primary receiver and transmitter, capacity is achieved by transmiting along the spatial directions (SD) associated with the singular values of its channel matrix using a water-filling power allocation (PA) scheme. Often, power limitations lead the primary transmitter to leave some of its SD unused. Here, it is shown that the opportunistic link can transmit its own data if it is possible to align the interference produced on the primary link with such unused SDs. We provide both a processing scheme to perform IA and a PA scheme which maximizes the transmission rate of the opportunistic link. The asymptotes of the achievable transmission rates of the opportunistic link are obtained in the regime of large numbers of antennas. Using this result, it is demonstrated that depending on the signal-to-noise ratio and the number of transmit and receive antennas of the primary and opportunistic links, both systems can achieve transmission rates of the same order.
MIT Department
Massachusetts Institute of Technology. Research Laboratory of Electronics
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DOI of Published Version
https://doi.org/10.1109/tsp.2010.2046084
