Transmit Antenna Selection Schemes for Quadrature Spatial Modulation

The objective of this paper is to investigate the application of transmit antenna selection (TAS) to quadrature spatial modulation (QSM). The application of optimal Euclidean distance based antenna selection (EDAS) to QSM (EDAS-QSM) is first proposed. EDAS-QSM requires an exhaustive search, which imposes a significantly high computational complexity. In this regard, a reduced-complexity algorithm for the computation of EDAS-QSM is proposed. Finally, several low-complexity, sub-optimal TAS techniques for QSM are investigated. The decision metrics of these schemes are based on channel amplitude, antenna correlation, Euclidean distance or a combination thereof. Monte Carlo simulation results demonstrate the effectiveness of the proposed schemes, while the computational complexity of each is analysed. The trade-off between error performance and computational complexity is discussed for each of the schemes.