Power allocation for downlink users using SIC in NOMA for better QoS
Non-orthogonal multiple access (NOMA) scheme is the utmost importance for the future communication technologies to meet the requirements of high speed, low latency, massive connectivity and high efficiency. The main idea behind the NOMA scheme is to fascillitate the massive number of users in the same time slot or in the same spreading code. The maximum advantage of NOMA depends on the fact that the resources such as; time and spreading codes should be effectively allocated which includes power allocation along with proper channel assignment. The NOMA is a general framework and this system contains base station (BS) and multiple users (MUs) for uplinks and downlinks. This paper investigates an effective study on NOMA along with power allocation schemes with SIC (successive interference cancellation) which is used in downlink channels to enhance the quality of service (QoS) to the weak users. The comparison between OMA and NOMA with or without Power Allocation Coefficients (PAC) is presented and the improved performance of NOMA as a whole system has been shown by the simulation results.