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Both antenna selection and spatial modulation allow for low-complexity MIMOtransmitters when the number of RF chains is much lower than the number oftransmit antennas. In this manuscript, we present a quantitative performancecomparison between these two approaches by taking into account implementationalrestrictions, such as antenna switching. We consider a band-limitedMIMO system,for which the pulse shape is designed, such that the outband emission satisfiesa desired spectral mask. The bit error rate is determined for this system,considering antenna selection and spatial modulation. The results depict thatfor any array size at the transmit and receive sides, antenna selectionoutperforms spatial modulation, as long as the power efficiency is smaller thana certain threshold level. By passing this threshold, spatial modulation startsto perform superior. Our investigations show that the threshold takes smallervalues, as the number of receive antennas grows large. This indicates thatspatial modulation is an effective technique for uplink transmission in massiveMIMO systems.

A Fair Comparison Between Spatial Modulation and Antenna Selection in Massive MIMO Systems