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Optimal Symbol-by-Symbol Costa Precoding for a Relay-aided Downlink Channel
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, The Institute of Technology.
2011 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 59, no 8, 2274-2284 p.Article in journal (Refereed) Published
Abstract [en]

In this article, we consider practical approaches to Costa precoding (also known as dirty paper coding). Specifically, we propose a symbol-by-symbol scheme for cancellation of interference known at the transmitter in a relay-aided downlink channel. For finite-alphabet signaling and interference, we derive the optimal (in terms of maximum mutual information) modulator under a given power constraint. A sub-optimal modulator is also proposed by formulating an optimization problem that maximizes the minimum distance of the signal constellation, and this non-convex optimization problem is approximately solved by semi-definite relaxation. For the case of binary signaling with binary interference, we obtain a closed-form solution for the sub-optimal modulator, which only suffers little performance degradation compared to the optimal modulator in the region of interest. For more general signal constellations and more general interference distributions, we propose an optimized Tomlinson-Harashima precoder (THP), which uniformly outperforms conventional THP with heuristic parameters. Bit-level simulation shows that the optimal and sub-optimal modulators can achieve significant gains over the THP benchmark as well as over non-Costa reference schemes, especially when the power of the interference is larger than the power of the noise.

Place, publisher, year, edition, pages
IEEE , 2011. Vol. 59, no 8, 2274-2284 p.
Keyword [en]
Costa precoding, dirty paper coding, interference, modulation, relay channel
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-66102DOI: 10.1109/TCOMM.2011.053111.100645ISI: 000295008500026OAI: diva2:401710
©2011 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. Jinfeng Du, Erik G. Larsson, Ming Xiao and Mikael Skoglund, Optimal Symbol-by-Symbol Costa Precoding for a Relay-aided Downlink Channel, 2011, accepted IEEE Transactions on Communications. Available from: 2011-03-03 Created: 2011-03-03 Last updated: 2011-10-14

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