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In this paper, we discuss a non-orthogonal multiple access (NOMA) scheme toexploit a high diversity gain using repetition, namely repetition-based NOMA.Unlike conventional power-domain NOMA, all the users can have the same transmitpower, but different number of repetitions. Thanks to a high diversity gain, alow outage probability can be achieved without instantaneous channel stateinformation (CSI) feedback for power allocation. A closed-form expression foran upper-bound on the outage probability is derived so that the values of keyparameters can be decided to maintain the outage probability below a targetvalue. We also consider the average error probability for finite-length codes.Simulation results are compared with the derived bounds and it is shown thatthe bounds are reasonably tight and can be used to decide key parameters (e.g.,code rates) to guarantee target error probabilities.

Repetition-based NOMA Transmission and Its Outage Probability Analysis