In this letter, we study a two-user downlink asynchronous non-orthogonal multiple access (ANOMA) with limited feedback. We employ the max-min criterion for the power allocation and derive the closed-form expressions for the upper and lower bounds of the max-min rate. It is demonstrated that ANOMA can achieve the same or even higher average maxmin rate with a lower feedback rate compared with NOMA. Moreover, we propose a quantizer optimization algorithm which applies to both NOMA and ANOMA. Simulation results show that the optimized quantizer significantly improves the average max-min rate compared with the conventional uniform quantizer, especially in the scenario with a low feedback rate.
@article{arxiv.2005.13403,
title = {Downlink Asynchronous Non-Orthogonal Multiple Access with Quantizer Optimization},
author = {Xun Zou and Mehdi Ganji and Hamid Jafarkhani},
journal= {arXiv preprint arXiv:2005.13403},
year = {2020}
}