H-ARQ Based Non-Orthogonal Multiple Access with Successive Interference Cancellation

In this paper, we 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). We 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. It can also be shown that the outage probability of the NOMA with SIC is lower than that of the OMA when the transmission rate is sufficiently low where SIC can be facilitated.