Implementation of Successive Power Level Detection and Equalization for NOMA

With the rapid increase in the number of cellular users and increase in data size, the bandwidth crunch for 5G systems and onwards has become a serious problem. The need for multiplexing techniques which can accommodate more number of users and yet render satisfactory Quality of Service (QoS) is indispensable. Orthogonal Frequency Division Multiplexing (OFDM) has been used widely for 3G and 4G based systems, however Non-Orthogonal Multiple Access (NOMA) has been the frontrunner for the future based cellular system due to its higher spectral efficiency. It has its associated problems too, which happens to be separation of the signals at the receiving end in power domain. This paper presents a technique which uses successive power level detection and equalization to attain accurate separation of signals at the receiver and achieve satisfactory Quality of Service (QoS). Additionally, channel equalization has been incorporated to nullify the adverse effects in the channel. The performance of the system has been evaluated based on the Bit Error Rate (BER) of the system for different path gains for signals. It has been shown that the proposed system attains better BER performance compared to conventional and existing previous systems.