This paper derives the outage and packet error probabilities of Non Orthogonal Multiple Access (NOMA) systems. In the first time slot, the Base Station transmits a combination of two symbols \(s_w\) and \(s_s\) dedicated for weak and strong users. This signal is received by the two users and a relay. In the second time slot, the relay amplifies the received signal to the two users. Both users use the signal with the highest Signal to Interference plus Noise Ratio among direct and relayed signals. The weak user detects only its signal. Strong user first detects symbol \(s_w\) of weak user. After removing the contribution of weak user, strong user detects its own symbol \(s_s\). In this article, expressions for outage probability, Packet Error Probability and the throughput of cooperative NOMA are derived. We also optimize the power allocated to weak and strong users to maximize the system throughput.

本文推导了非正交多路访问（NOMA）系统的中断和数据包错误概率。在第一个时隙中，基站传输专用于弱用户和强用户的两个符号\（s_w \）和\（s_s \）的组合。该信号由两个用户和一个中继接收。在第二个时隙中，中继将接收到的信号放大到两个用户。两个用户都使用直接和中继信号中具有最高信噪比和噪声比的信号。弱用户仅检测到其信号。强用户首先检测弱用户的符号\（s_w \）。删除弱用户的贡献后，强用户会检测到自己的符号\（s_s \）。在本文中，得出了中断概率，分组错误概率和协作式NOMA吞吐量的表达式。我们还优化了分配给弱用户和强用户的功率，以最大化系统吞吐量。