Cooperative relay to relay communication using NOMA for energy efficient wireless communication

In this paper, non-orthogonal-multiple access is used in a single cell environment which employs cooperative relays for transferring signals to poor quality users, as compared to fixed sectorization and an adaptive sectorization, where the total power of bases station (BS) is divided equally based on the number of sectors and where sector size is decided by the number of devices in a sector respectively. The fixed sectorization suffers from poor services, adaptive sectorization suffers from poor services also when a relay is provided less power. To solve this problem, in this paper the available total power of the BS is divided among the relays proportional to the number of users they are handling. The power is redistributed every time number of users varies. The paper also proposes a scheme for the selection of a relay for any user experiencing poor quality service depending upon angle and coverage. The relay power is also varied to optimize system performance which reduces the complexity of using successive interference cancellation at the poor quality users. The simulation proves the dominance of the proposed relay to relay scheme over other similar works in literature.