Multiuser pre-coding aided quadrature spatial modulation for large-scale MIMO channels

Pre-coding aided quadrature spatial modulation (PQSM) is a promising multiple input multiple output (MIMO) transmission technology. The multiuser (MU) detection in PQSM system is investigated in this paper. Based on the known channel state information, pre-coding matrix is designed to pre-process the in-phase and quadrature signals of quadrature spatial modulation (QSM) to reduce the inter-channel interference. In order to lower the complexity at the receiver brought by the orthogonality of the PQSM system, an orthogonal matching pursuit (OMP) detection algorithm and a reconstructed model are proposed. The analysis and simulation results show that the proposed algorithm can obtain a similar bit error rate (BER) performance as the maximum likelihood (ML) detection algorithm with more than 80% reduction of complexity.