Title :
MIMO detection for high-order QAM constellations based on successive decision feedback semidefinite relaxation
Author :
Ma, Zheng ; Zhao, Ming ; Chen, Qingchun ; Fan, Pingzhi
Author_Institution :
Provincial Key Lab. of Inf. Coding & Transm., Southwest Jiaotong Univ., Chengdu, China
Abstract :
A semidefinite relaxation(SDR) scheme for high order quadrature amplitude modulation (QAM) in multiple input and multiple output (MIMO) system is proposed in this letter. By performing bound-constrained semidefinite relaxation (BC-SDR) and its tightened version successively, a very low complexity suboptimum approach for high order QAM signal detection can be obtained. The analysis and simulations demonstrate that the proposed successive decision feedback semidefinite relaxation scheme could outperform BC-SDR and approach its tightened version performance but with much lower complexity.
Keywords :
MIMO communication; automatic repeat request; communication complexity; quadrature amplitude modulation; relaxation theory; signal detection; BC-SDR; MIMO detection; MIMO system; SDR scheme; bound-constrained semidefinite relaxation; high order QAM signal detection; high order quadrature amplitude modulation; high-order QAM constellations; low complexity suboptimum approach; multiple input and multiple output system; successive decision feedback semidefinite relaxation scheme; multiple input and multiple output (MIMO); quadrature amplitude modulation (QAM); semidefinite relaxation(SDR);
Conference_Titel :
Signal Design and its Applications in Communications (IWSDA), 2011 Fifth International Workshop on
Conference_Location :
Guilin
Print_ISBN :
978-1-61284-047-5
DOI :
10.1109/IWSDA.2011.6159418
