Downlink Power Allocation and User Selection for CoMP-NOMA in Multi-Cell Networks

In this paper, we consider the power allocation problem in the downlink multi-cell multi-user cellular network, where the cells utilize non-orthogonal multiple access (NOMA) such that more than one user can access the same frequency-time resource simultaneously and the signals of the multi-users can beseparated successfully using successive interference cancellation (SIC). We also utilize the coordinated multi-point (CoMP) transmission in which some users are located between multiple cells/ Base stations (BSs) and experience more inter-cell interference (ICI) while in non-coordinated multi-point (non-CoMP) transmission, the users experience the channel gain of one BS. In this case, we formulate the problem of maximizing the network data rate by selecting joint proper CoMP users, non- CoMP users and also downlink power allocation of non-CoMP users for each cell of the network. We propose a low-complexity iterative algorithm based on the convex optimization method and Karush–Kuhn–Tucker conditions to obtain the optimal solutionof the problem. Simulation results validate the performance of our proposed algorithm for different values of the system parameters.Keywords

Keywords:

Non-orthogonal multiple access (NOMA) , coordinated multi-point (CoMP) transmission , Multi-Cell Network , Data rate of the network , Energy Efficiency