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Title: Minimum bit error rate nonlinear precoding for multiuser MIMO and high SNR
Author: Castanheira, Daniel
Gameiro, Atilio
Silva, Adão
Keywords: Linear precoding
Minimum BER
Multi-user MIMO
Non-negative least squares
Issue Date: 30-Jul-2011
Publisher: Elsevier
Abstract: This manuscript focuses on the minimization of the bit-error-rate in the high signal to noise ratio regime, for the downlink of a multiuser MIMO channel with N transmit antennas and K single antenna users. In the design of such a precoder the knowledge of the transmitted data and full channel state information at the transmitter are assumed. It is shown that, in the high signal to noise regime, the problem simplifies from a constrained quadratic nonlinear optimization to a single quadratic program, allowing to reduce the complexity. This quadratic problem is equivalent to maximize the minimum distance between the user received symbols and corresponding decision boundaries. The proposed algorithm selects and inverts part of the correlation matrix, unlike the zero-forcing where full inversion is required. This leads to a better performance as the selection allows us to get a better conditioned matrix. Also, this allows us to treat zero-forcing as a special case of the algorithm. The results show that the algorithm achieves a performance close to the optimum, with much lower complexity. © 2011 Elsevier B.V. All rights reserved.
Peer review: yes
DOI: 10.1016/j.phycom.2011.07.003
ISSN: 1874-4907
Appears in Collections:DETI - Artigos

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