Beamforming 1 Bit error rate 1 Communications systems 1 Decoding 1 Deep learning 1 High signal-to-noise ratio 1 Index modulation 1 Ma ximum likelihoods 1 Maximum likelihood 1 Maximum-likelihood 1 Multiusers 1 New technology used in massive MIMO Orbital angular momentum 1 Orthogonal frequency division multiplexing 1 Orthogonal frequency-division multiplexing 1 Signal receivers 1 Signal to noise ratio 1 Visible light communication 1 article 1 artificial intelligence 1 beamforming 1 deep learning 1 light 1 maximum likelihood 1 maximum likelihood method 1 new technologies used in massive MIMO 1 orbital angular momentum 1 signal noise ratio 1 simulation 1 theoretical study 1