Abstract
A new multiple-ring star- M -ary quadrature amplitude modulation-aided spatial modulation ( N R-STAR- M QAM-SM) scheme is proposed. The aim is to minimise the average bit error probability (ABEP) of the system. Then in the interest of further minimising the ABEP, the authors formulate a low-complexity algorithm to achieve the optimum radii of N R-STAR- M QAM-SM. This algorithm is based on a specific multiple-input multiple-output configuration and the pairwise error probability function. To validate the results of the proposed scheme, a closed-form union-bound theoretical ABEP expression is derived. Finally, to improve the error performance of N R-STAR- M QAM-SM, the authors propose a low-complexity Euclidean distance-based antenna selection (EDAS) algorithm for N R-STAR- M QAM-SM (EDAS- N R-STAR- M QAM-SM). Since all amplitude/phase modulation schemes are considered to have rotational symmetry and symmetric constellation points have the same EDAS solution, the authors achieve EDAS- N R-STAR- M QAM-SM by searching only one constellation point per symmetric constellation set. The EDAS- N R-STAR- M QAM-SM solution exhibits a significant reduction in the computational complexity compared with the conventional EDAS solution.
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