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In the downlink NOMA phase, the source transmits a signal S representing two superimposed data symbols, s1 and s2. where alpha 1 and alpha 2 are the power allocation coefficients and Pt is the total transmission power from the base station source. It is assumed that the first symbol is to be extracted for forwarding at relay 1, while the second symbol at relay 2. It is also assumed that the first symbol is extracted at relay 1 through applying successive interference cancellation SIC by decoding symbol 2 first, while relay 2 decodes for symbol 2 directly. Hence, the power allocation coefficients must be such that alpha 2 greater than alpha 1. In order to consider symbol 2 successfully decoded at relay 1, the data rate for s2, on the source relay 1 link must be greater than the target data rate. Then, after performing SIC, The data rate for symbol 1 on source relay 1 link could be computed as the written equation.
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IEEE/ICACT20220371 Slide.06
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