Abstract
A novel multiple-input and multiple-output transmission scheme termed as space–time block coded quadrature spatial modulation (STBC-QSM) is proposed. It amalgamates the concept of quadrature spatial modulation (QSM) and space–time block coding (STBC) to exploit the diversity benefits of STBC relying on sparse radio frequency chains. In the proposed STBC-QSM scheme, the conventional constellation points of the STBC structure are replaced by the QSM symbols; hence, the information bits are conveyed both by the antenna indices as well as by conventional STBC blocks. Furthermore, an efficient Bayesian compressive sensing (BCS) algorithm is developed for our proposed STBC-QSM system. Both our analytical and simulation results demonstrated that the proposed scheme is capable of providing considerable performance gains over the existing schemes. Moreover, the proposed BCS detector is capable of approaching the maximum likelihood detector's performance despite only imposing a complexity near similar to that of the minimum mean square error detector in the high signal-to-noise ratio regions.
Highlights
Q UADRATURE spatial modulation (QSM) [1] is a high-efficiency Multiple-Input and MultipleOutput (MIMO) technique, which exploits both the in-phase and quadrature dimensions for enhancing the overall throughput of the conventional Spatial Modulation (SM) system [2]
An Efficient Bayesian Compressive Sensing detector is proposed for our STBCQSM system, which is capable of approaching the Maximum Likelihood (ML) detector’s performance at the Minimum Mean Square Error (MMSE) detector’s complexity in the high Signal to Noise Ratio (SNR) region
We propose a Space Time Block Coding (STBC)-QSM system having Nt Transmit Antennas (TAs) and Nr Receive Antennas (RAs) operating in the flat Rayleigh fading channels
Summary
Q UADRATURE spatial modulation (QSM) [1] is a high-efficiency MIMO technique, which exploits both the in-phase and quadrature dimensions for enhancing the overall throughput of the conventional Spatial Modulation (SM) system [2]. In the ESM-ATA scheme, a novel Space Time Block Coding (STBC) based SM structure was presented, which is capable of outperforming the existing STBC-SM schemes [11] in terms of its Bit Error Ratio (BER), despite its modest complexity This scheme achieves its diversity gain at the expense of a reduced transmit rate. In order to further exploit the diversity gain of QSM system at a low-complexity, in this paper a novel STBCQSM system relying on Efficient Bayesian CS (E-BCS) detector is investigated. Both the diversity gain and the Average Bit Error Probability (ABEP) are analyzed for the proposed STBC-QSM system. An Efficient Bayesian Compressive Sensing detector is proposed for our STBCQSM system, which is capable of approaching the Maximum Likelihood (ML) detector’s performance at the Minimum Mean Square Error (MMSE) detector’s complexity in the high Signal to Noise Ratio (SNR) region
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