Abstract
This paper studies a two-user cooperative non-orthogonal multiple access network with a novel cooperation scheme, where the source communicates with the near user directly or through the help of K relays, while the communication to the far user relies on the help of the near user or the K relays. We propose a new amplify-and-forward (AF)-based transmission protocol in which the near user sends a 1-bit feedback to inform relays of its detection results at the end of the first phase. Based on the 1-bit feedback and the available channel state information at each relay, optimal relay selection strategy encompassing two different selection criteria is designed to minimize the system outage probability (SOP). Tight-approximated as well as asymptotic closed-form expressions of the SOP are derived. Asymptotic results illustrate that the proposed relay selection strategy can achieve the full diversity order of K + 1. Simulation results are finally provided to validate our analytical results and the superiority of the new cooperation scheme.
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