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An Iterative Precoder Design for Successive Zero-Forcing Precoded Systems
KTH, School of Electrical Engineering (EES), Signal Processing. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
2012 (English)In: IEEE Communications Letters, ISSN 1089-7798, Vol. 16, no 1, 16-18 p.Article in journal (Refereed) Published
Abstract [en]

Successive zero-forcing (SZF) is a precoding technique for broadcast channels that partially precancels the multiuser interference. Due to the residual interference, the optimal precoder design for SZF is difficult to find, and currently unknown. This letter proposes a suboptimal iterative precoder design for the sum rate maximization problem for SZF, using a local optimization method. In each iteration, the precoders are updated to maximize a first-order approximation of the sum rate, which can be easily solved since the approximation is concave with the precoders. By initializing the precoders with zero matrices, we analytically prove that the iterative design can achieve a larger sum rate than the block diagonalization (BD) approach. Moreover, numerical results demonstrate the superior sum-rate performance of the proposed design over the existing scheme, which is based on a heuristic method.

Place, publisher, year, edition, pages
2012. Vol. 16, no 1, 16-18 p.
Keyword [en]
MIMO, downlink channel, linear precoding
National Category
URN: urn:nbn:se:kth:diva-91144DOI: 10.1109/LCOMM.2011.111611.111834ISI: 000299509300006OAI: diva2:508468
ICT - The Next Generation

QC 20120308

Available from: 2012-03-08 Created: 2012-03-08 Last updated: 2013-04-11Bibliographically approved

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