On Relay Selection for NOMA Based Cooperative Networks

In this work, a non-orthogonal multiple access (NOMA) based transmission between two sources and two end users is examined, where a single relay is selected from a set of full-duplex / half-duplex (FD / HD) multiple relays according to the quality of service criterion. Unlike available works, the variance of self-interference channel is modeled such that it is not only linearly but also exponentially dependent on the transmitted power of the relay. This representation allows us to demonstrate effect of successive interference cancellation (SIC) on error floor and also permits us to examine the imperfect SIC case for both FD and HD transmissions. Results for outage probability of the described system are provided via asymptotic analysis and Monte Carlo simulation technique.

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