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This letter proposes the usage of orbital angular momentum (OAM) forcooperative non-orthogonal multiple access (CNOMA) to enhance sum capacity (SC)for the future cellular communication system. The proposed CNOMA-OAM scheme isanalyzed and compared with other schemes, i.e., conventional CNOMA,conventional orthogonal multiple access (OMA) with OAM. The impact of the powerallocation factor for OAM beam over SC is also analyzed. The analytical resultis justified by simulation results which demonstrate that the proposedCNOMA-OAM provides higher SC compared to other schemes.

Capacity Enhancement of Cooperative NOMA over Rician Fading Channels with Orbital Angular Momentum