Guiazon, RF;
Wong, K-K;
Wisely, D;
(2014)
Capacity Analysis of Interference Alignment With Bounded CSI Uncertainty.
IEEE Wireless Communications Letters
, 3
(5)
505 - 508.
10.1109/LWC.2014.2344656.
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Abstract
Interference alignment (IA) has been demonstrated to achieve the degree-of-freedom (DoF) of an interference channel given perfect global channel state information (CSI). In this letter, we consider the case of imperfect CSI with bounded errors and derive a capacity lower bound of the channel using IA. We show that this lower bound is within 1 bps/Hz of the capacity of the perfect CSI case up to a certain signal-to-noise ratio (SNR) which we refer to it as the saturating SNR. Further, we introduce a new metric called modified DoF (mDoF) in order to characterize the multiplexing performance of IA with imperfect CSI at finite SNR. Simulation results for the 3-user case are provided to illustrate the region within which the actual capacity of IA falls.
| Type: | Article |
|---|---|
| Title: | Capacity Analysis of Interference Alignment With Bounded CSI Uncertainty |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/LWC.2014.2344656 |
| Publisher version: | http://dx.doi.org/10.1109/LWC.2014.2344656 |
| Additional information: | Copyright © 2014 IEEE. This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/ |
| Keywords: | Beamforming, Interference alignment, Interference channel, Capacity bound, Channel errors. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1457722 |
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