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Following the uplink NOMA, each of the two relays, forwards the decoded symbols to the destination node. The relay 2 is closer to the destination than the relay 1, implying a higher channel gain for the relay to destination link. With appropriate power allocation of alpha 4 greater than alpha 3, the signal received at the destination is dominated by the signal sent from relay 2. The destination directly decode symbol 2, the stronger component, treating symbol 1 as noise. Then SIC is performed to decode symbol Symbol, under the condition of successfully decoding of Symbol 2.
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