Title :
An extended semidefinite-relaxation method for MIMO detection of high-order QAM signals
Author :
Cai, Shu ; Yang, Kehu
Author_Institution :
ISN Lab., Xidian Univ., Xi´´an, China
Abstract :
In this paper, we propose an extended semidefinite-relaxation (SDR) method for multiple-input multiple-output (MIMO) detection of high-order QAM signals. In the proposed method, high-order QAM constellations are represented by an equivalent virtually-antipodal form. Based on this form, the alphabet relaxation components in the existing SDR formulation can be constrained to the original alphabet set by additional inequalities. Simulation results demonstrate that the extended SDR method provides an alternative to the existing SDR algorithm of with compact formulation for arbitrary constellations.
Keywords :
MIMO communication; quadrature amplitude modulation; MIMO detection; alphabet relaxation components; extended semidefinite-relaxation method; high-order QAM constellations; high-order QAM signals; multiple-input multiple-output detection; virtually-antipodal form; Approximation methods; Computational complexity; Detectors; Error probability; MIMO; Maximum likelihood detection; NP-hard problem; Quadrature amplitude modulation; Receiving antennas; Signal to noise ratio;
Conference_Titel :
Communications and Networking in China, 2009. ChinaCOM 2009. Fourth International Conference on
Conference_Location :
Xian
Print_ISBN :
978-1-4244-4337-6
Electronic_ISBN :
978-1-4244-4337-6
DOI :
10.1109/CHINACOM.2009.5339927
