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Semidefinite Relaxations for MIMO Transmissions With High-Order QAM Constellations

Souto, N.S. ; Ribeiro, M. ; Sebastião, P.

IEEE Signal Processing Letters Vol. 23, Nº 7, pp. 984 - 988, July, 2016.

ISSN (print): 1070-9908
ISSN (online): 1070-9908

Journal Impact Factor: 1,751 (in 2014)

Digital Object Identifier: 10.1109/LSP.2016.2576640

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Abstract
In this letter, simple semidefinite relaxations are proposed for the detection of high-order quadrature amplitude modulations in multiple-input–multiple-output systems. The detector is based on the addition of several convex and concave quadratic inequality constraints into the maximum-likelihood detector before relaxing the problem into a convex one. Combined with a randomized sampling procedure, it is shown that the performance and worst-case computational complexity of the proposed approach makes it very competitive against existing detectors in large problem sizes.