Abstract
In this paper, the uplink transmission scheme combining spatial index modulation with cell-free massive multi-input multi-output (MIMO) system is studied. The access point (AP) and users in the cell-free network have multiple antennas, which inherits the advantages of macro diversity and interference cancellation of massive distributed MIMO with large-scale AP, and improve the system reliability. In the user transmitter, multiple active spatial modulation (MA-SM) can be directly used to process the transmitted information. The index information can be mapped into the active antenna by using the combinatorial method, while the orthogonal matching pursuit (OMP) algorithm is used for demodulation and decoding in the central processing unit (CPU). Simulation results show that index modulation has better decoding performance on the basis of correct estimation of channel information, and the more antennas the user has, the better index modulation performance will be.
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