Contents I. Introduction
Different multiple access schemes are acquired from First Generation (1G) to Fourth Generation (4G). All the proposed schemes from 1G to 4G are common in one particular subject [1]–[4]. That is the signals that are transmitted from the transmitter to the receiver must be orthogonal to each other [5]. OMA is one of the multiple access schemes which uses orthogonal resource allocation among individual users to avoid intra-cell interference. This technique also helps in the dissociation of respective user data in which time and frequency resources are split for multiple receivers in current broadcasting systems [6]. But the number of users that can be supported through this OMA method is then limited by the number of orthogonal resources available. As 4G, uses the OMA approach, that cannot satisfy high-speed communication or with low latency, etc. The main disadvantages of 4G networks are, they don't accomplish the exponential growth in capacity demands, low latency, massive connectivity, high throughput, and energy efficiency. A lot of investigations have been done to satisfy various requirements in practical systems in the history of broadband multimedia communications and broadcasting [7]–[8]. Among all, 5G technology comes with a better solution. Since it uses Non-Orthogonal Multiple Access (NOMA). NOMA uses the same resource blocks to transmit multiple users’ signals from the transmitter to the receiver. During the transmission of signal in NOMA, at the transmitter side, it performs super position-coding technique and at the receiver side, it introduces some controllable interference like Successive Interference Cancellation (SIC), thus allows multiplexing users in the power domain [9]–[12].
