Spatial Modulation Assisted MultiAntenna NonOrthogonal Multiple Access

Multi-antennanon-orthogonalmultipleaccess(NOMA)isapromisingtechniquetosignificantlyimprovespectralefficiencyandsupportmassiveaccess,whichhasreceivedconsiderableinterestfromacademiaandindustry.Thisarticlefirstbrieflyintroducesthebasicideaofconventionalmulti-antennaNOMAtechnique,andthendiscuss