Why should NOMA be used in place of OMA?

 Answer:- 



In an orthogonal multiple access (OMA) system, like TDMA and FDMA, orthogonal resource allocation is employed among users to avoid intra-cell (inter-user) interference. The number of supported users is constrained by the available orthogonal resources. In OMA, each user is assigned a fixed frequency band. However, in NOMA, all frequency bands can be utilized by each user, as illustrated in the figure above. NOMA allows and mitigate intra-cell interference in resource allocation of users.

So, according to the Shannon Capacity Equation,

C = B log2(1+S/N)

The data rate is directly proportional to the bandwidth. 

In NOMA, we get a large frequency band. So, we can improve the data rate with the help of NOMA.

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