Scalable Quadrature Spatial Modulation

We consider quadrature spatial modulation (QSM) schemes, which achieve high spectral efficiency (SE) via the dispersion of a relatively small number $P$ notation="LaTeX">$M$ -ary modulated symbols over large combinations notation="LaTeX">$n_{T}$ transmit antennas and notation="LaTeX">$T$ instances. In particular, we design new space-time block code (STBC)-based scalable QSM scheme combining SE with maximum diversity optimum coding gains. Deriving closed-form expression for SE, show that scaling size not only is required to optimality, but also results in further gains bit error rate (BER) performance. Building on latter optimal parameterization, fully optimized (OS-QSM) transmitter then obtained by introducing matrix index selection algorithm ensures even utilization spatial-temporal resources. Finally, greedy boxed iterative shrinkage thresholding (GB-ISTA) receiver proposed, exploits inherent sparsity signals while detecting spatially digitally bits fashion. The resulting low complexity receiver, linear , enables OS-QSM systems previously prohibitive dimensions.