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In this paper, a joint transmission coordinated multi-point basednon-orthogonal multiple access (JT-COMP NOMA) combined with spatial modulation(SM), termed as JT-COMP NOMA-SM, is proposed to enhance capacity. User capacityand ergodic sum capacity (ESC) of M number coordinated multi-point basestations (COMP BSs) within N number of cells are analyzed by consideringimperfect successive interference cancellation (SIC) and imperfect channelstate information (CSI). The performances of the proposed syatem are comparedwith non-orthogonal multiple access (NOMA), and joint transmission coordinatedmulti-point combined with virtual user pairing based non-orthogonal multipleaccess (JT-COMP VP-NOMA) by both simulation and analysis. The results show thatthe proposed system has the same cell center user (CCU) capacity compared toJT-COMP VP-NOMA and a higher cell edge user (CEU) capacity than the otherschemes. ESC of the proposed system outperforms the other schemes due toenhancing CEU capacity. Imperfect SIC and imperfect CSI may degrade capacity.The proposed system can maintain CEU capacity better than the other schemes ifthe number of cells is increased. It happens because SM works beyond Shannonupper bounds which can mitigate inter-cell interference (ICI).

Non-Orthogonal Multiple Access with Spatial Modulation in Downlink Coordinated Multipoint Transmission