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The concept of NOMA:
From this figure, we can get an idea on the concept of noma. As we can see here, for simplicity, we have considered only 2 users, 1st user, which is Un, which is located a little bit closer to the base station, that¡¯s why we call it a near user. Whereas we have the far user which is Uf which is located a little bit far from the base station. And we also have hf and hn representing the channel gain of far user and near user. So, we can see here, from the base station, we have 2 signals, which have been encoded using superposition coding in the power domain. Where sn is the signal for the near user and sf is the signal for the far user. Here, the signal for far user sf is encoded with high power when compared to the signal for the near user. And after transmissions, at the near user, we have to apply SIC in order to decode the 1st signal of the far user before decoding its own signal then we will be able to decode its own signal. Whereas for the far user, he can decode his own signal directly and he can treat the signal of near user as noise.
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IEEE/ICACT20240040 Slide.05
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