首页|Blind Signal Reception in Downlink Generalized Spatial Modulation Multiuser MIMO System Based on Minimum Output Energy
Blind Signal Reception in Downlink Generalized Spatial Modulation Multiuser MIMO System Based on Minimum Output Energy
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This paper considers downlink multiuser multiple-input-multiple-output system with parallel spatial modulation scheme,in which base station transmitter antennas are separated into K groups corresponding to K user terminals.Generalized spatial modulation is employed,in which a subset(more than single antenna)of transmit antenna array are activated and the activating pattern corresponds to specific spatial symbol.Different from existing precoding-based algorithms,we develop a two-stage detection scheme at each user terminal:In the pre-processing stage,a minimax algorithm is proposed to identify the indices of active antennas,where the key idea is that the mini-mum output energy of the detector is maximized;A constrained minimum output energy algorithm is proposed in the post-processing stage to mitigate multiuser interference and extract temporal symbols.Compared with existing precoding-based algorithms,the complexity is significantly reduced.Moreover,the proposed algorithm is semi-blind,in which only a small subset of channel state information is required to identify active antennas as well as eliminate multiuser interference.Simulation results demonstrate that the proposed algorithm is near-far resistant and the spec-tral efficiency is extensively increased compared to the conventional spatial modulation scheme.
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