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In this letter, we study a two-user downlink asynchronous non-orthogonalmultiple access (ANOMA) with limited feedback. We employ the max-min criterionfor the power allocation and derive the closed-form expressions for the upperand lower bounds of the max-min rate. It is demonstrated that ANOMA can achievethe same or even higher average maxmin rate with a lower feedback rate comparedwith NOMA. Moreover, we propose a quantizer optimization algorithm whichapplies to both NOMA and ANOMA. Simulation results show that the optimizedquantizer significantly improves the average max-min rate compared with theconventional uniform quantizer, especially in the scenario with a low feedbackrate.

Downlink Asynchronous Non-Orthogonal Multiple Access with Quantizer Optimization