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Various challenges are faced by the wireless networks of Fifth generation (5G) , the main challenge discussed in this paper regarding channel fetching schemes. For massiveconnectivity so that we can increase data rate and save bandwidth also. In this paper we present a review in code domain NOMA. There are two types of Non orthogonal multiple access techniques- Power domain NOMA and Code domain NOMA. Many schemes of code domain NOMA are described in this paper also. Regarding massive connectivity of fifth generation the resource elements (REs) is less compared to number of users. So that the ratio of user and REs is known as load β that should be finite.So,byusing code domain NOMA schemes we can limit this load.Types of NOMA techniques.As an introduction various types of methods are introduced like potential of OMA, and their presentation is compared in terms of spectral efficiency and bit error rate. |
