Title :
A Semidefinite Relaxation Approach to MIMO Detection for High-Order QAM Constellations
Author :
Sidiropoulos, Nicholas D. ; Luo, Zhi-Quan
Author_Institution :
Dept. of Electron. & Comput. Eng., Tech. Univ. of Crete, Chania-Crete
Abstract :
A new and conceptually simple semidefinite relaxation approach is proposed for MIMO detection in communication systems employing high-order QAM constellations. The new approach affords improved detection performance compared to existing solutions of comparable worst-case complexity order, which is nearly cubic in the dimension of the transmitted symbol vector and independent of the constellation order for uniform QAM, or affine in the constellation order for nonuniform QAM
Keywords :
MIMO systems; quadrature amplitude modulation; signal detection; MIMO detection; communication systems; high-order QAM constellation; multiple input multiple output system; quadrature amplitude modulation; semidefinite relaxation approach; symbol vector transmission; Binary phase shift keying; Decoding; Detectors; Gaussian noise; Lattices; Least squares methods; MIMO; Multiuser detection; Quadrature amplitude modulation; Search problems; High-order QAM; integer least squares; lattice search; multiple-input multiple-output (MIMO) detection; multiuser detection; semidefinite programming; semidefinite relaxation (SDR);
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2006.874443
