This paper presents a novel generalized quadrature spatial modulation (GQSM) transmission scheme using antenna grouping. The proposed GQSM scheme combines QSM and conventional spatial multiplexing (SMux) techniques in order to improve the spectral efficiency (SE) of the system. Analytical and simulation results show that the proposed transmission scheme has minimal losses in terms of the average bit error probability along with the advantage of an increased SE compared with previous SM and QSM schemes. For the case studies, this advantage represents a reduction of up to 81% in terms of the number of required transmit antennas compared with QSM. In addition, a detection architecture based on the ordered successive interference cancellation scheme and the QR decomposition is presented. The proposed QRD-M adaptive algorithm showed a near-maximumlikelihood performance with a complexity reduction of approximately 90%.
This Letter presents an amplify and forward (AF) relay assisted multiuser multiple input-multiple output (MU-MIMO) downlink transmission system based on a double quadrature spatial modulation (DQSM) scheme. The authors analyse and compared the bit error rate performance of the proposed AF-MU-MIMO-DQSM system with its conventional counterpart AF-MU-MIMO system, which uses quadrature amplitude modulation/phase shift-keying modulation. Results show that the utilised technique can effectively cancel the interference produced by multiple users and multiple relays in the system. The proposed AF-MU-MIMO-DQSM system has up to 2 dB gain compared with the conventional system for the analysed cases.
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