Non-orthogonal multiple access (NOMA) is a promising air-interface technology for its ability to support massive wireless mobile terminals. In this paper, the outage performance for
uplink NOMA systems employing the dynamic ordered successive
interference cancellation receiver is analyzed under the independent but not identically distributed (i.ni.d.) fading environment.
We theoretically reveal the general approach to derive the closedform outage probability expression for an arbitrary number of
serving users. Under the i.ni.d. fading environment, the probability
for each possible decoding order is derived respectively based on
the observation of the time-varying received power strength for
each user. Furthermore, encountering the challenge of solving the
multidimensional integration, a recursive method is proposed to
deal with the conditional outage probabilities under a certain
decoding order as a joint probability problem with the linear
constraints of the decoding order and the required data rate.
Finally, we derive the closed-form outage probability expressions.
The simulations are performed to validate the accuracy of the
theoretical results and reveal the superiority of the dynamic mode
over the fixed one.