In case of 2 users, is it necessary that both users NOMA should perform better than OMA ( considering TDMA ) ?. In NOMA, If we allocate more power to far user, then it will perform better than OMA far user but near user will suffer and has less sum-rate. In terms of overall sum rate also, even for the same channel condition, OMA performance is little more than NOMA performance.
In NOMA, if we calculate the power allocation coefficient of far user according to the channel condition, its value came near half which make it useless to calculate power coefficient using channel condition and we have to allocate power randomly.
The main purpose of NOMA is to expand the rate region as compared to OMA. One cannot increase the sum rate (optimal FDMA gives the same sum rate as optimal NOMA), but one can divide the sum rate between the users in different ways since the rate region is larger.
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