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Following the downlink NOMA principle, the source transmits two superimposed symbols with different power allocations to two intermediate relays with varying distances from the source. Then, the relays forward the decoded signals to the destination using NOMA in an uplink mode. So, this proposed system can reap the benefits of NOMA in both downlink and uplink transmission. Most of the previous work on NOMA-based NDR networks was limited to a single relay scenario. They have not examined the benefits of multiple relays with the advantage of relay selection strategies to improve transmission reliability, limiting relay selection's functionality in practical systems.
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IEEE/ICACT20220371 Slide.04
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