The research of Non-Orthogonal Multiple Access (NOMA) is extensively used to improve the capacity of networks
beyond the fifth-generation. The recent merger of NOMA with ambient Backscatter Communication (BackCom),
though opening new possibilities for massive connectivity, poses several challenges in dense wireless networks.
One of such challenges is the performance degradation of ambient BackCom in multi-cell NOMA networks under
the effect of inter-cell interference. Driven by providing an efficient solution to the issue, this article proposes a
new resource allocation framework that uses a duality theory approach. Specifically, the sum rate of the multi-cell
network with backscatter tags and NOMA user equipments is maximized by formulating a joint optimization
problem. To find the efficient base station transmit power and backscatter reflection coefficient in each cell, the
original problem is first divided into two subproblems, and then the closed form solution is derived. A comparison
with the Orthogonal Multiple Access (OMA) ambient BackCom and pure NOMA transmission has been provided.
Simulation results of the proposed NOMA ambient BackCom indicate a significant improvement over the OMA
ambient BackCom and pure NOMA in terms of sum-rate gains
