The rapid evolution of technologies and use cases cellular networks increased the necessity for next-generation cellular systems. To coup, this demand the 3GPP formed a task force and started to develops the next-generation systems. In this work first, we have analyzed the next-generation mobile network, a.k.a. 5G, in terms of new technologies that are going to be adopted in its physical layer. One of the choke points of fast and reliable mobile networks is the handling of multiple users. Many models are studied or even used in the previous generations of mobile networks. But with the rapid growth of the damned data rate of those techniques can not handle the required rate within a good margin of performance.