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In this letter, an orthogonal time frequency space (OTFS) basednon-orthogonal multiple access (NOMA) scheme is investigated for thecoordinated direct and relay transmission system, where a source directlycommunicates with a near user with high mobile speed, and it needs the relayingassistance to serve the far user also having high mobility. Due to thecoexistence of signal superposition coding and multi-domain transformation, theperformance of OTFS-based NOMA is usually challenging to be measured from atheoretical perspective. To accurately evaluate the system performance of theproposed scheme, we derive the closed-form expressions for the outageprobability and the outage sum rate by using the Inversion formula andcharacteristic function. Numerical results verify the performance superiorityand the effectiveness of the proposed scheme.

Performance of OTFS-NOMA Scheme for Coordinated Direct and Relay Transmission Networks in High-Mobility Scenarios