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Outage Performance for Cooperative NOMA Transmission with an AF Relay
Xuesong Liang, Yongpeng Wu, Derrick Wing Kwan Ng, Yiping Zuo, Sh · 2017-03-10 · via cs.IT updates on arXiv.org

This letter studies the outage performance of cooperative non-orthogonal multiple access (NOMA) network with the help of an amplify-and-forward relay. An accurate closed-form approximation for the exact outage probability is derived. Based on this, the asymptotic outage probability is investigated, which shows that cooperative NOMA achieves the same diversity order and the superior coding gain compared to cooperative orthogonal multiple access. It is also revealed that when the transmit power of relay is smaller than that of the base station, the outage performance improves as the distance between the relay and indirect link user decreases.

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