A Survey of NOMA for 5G: Implementation Schemes and Energy Efficiency

Abstract

The 5th generation (5G) Network technology must meet various stringent necessities such as high spectral efficiency, low energy consumption and immense connectivity. Current wireless communication system uses radio resources to transmit data with Orthogonal Multiple Access (OMA). But, as the number of user’s growths, OMA-based technique might not meet user requirements. That why, NOMA has been introduced to fulfil the challenges of 5G network. This article provides a comparison between NOMA and OMA systems. The main NOMA strategies are debated by dividing them into two classes, namely, the power domain and the NOMA code domain. In addition, benefits and limitations are discussed.