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Multiple cases of relay selection are compared to each other to emphasize the previous observation. It can be observed that relay selection from a pool of relays located at the optimum location results in the highest achievable sum rate. In addition, randomly deployed relays results in better performance than relay selection from relays located all at a location other than the optimum location. In practical systems, randomly deployed relayed can be used with relay selection to maximize the benefit of NOMA-based diamond relay networks.
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IEEE/ICACT20220371 Slide.16
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