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In this paper, the authors consider Non-Orthogonal Multiple Access (NOMA) over block fading channels where the performance is limited by interference and fading. Re-transmission and interference cancellation techniques can be employed to improve performance. Re-transmissions can provide diversity gain, while Successive Interference Cancellation (SIC) can improve Signal to Interference Ratio (SIR). They can show that the proposed NOMA approach with re-transmission outperforms an Orthogonal Multiple Access (OMA) approach with re-transmission using information outage probability when the Signal to Noise Ratio (SNR) is low.
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