A novel device-to-device (D2D) aided uplink transmission scheme exploiting non-orthogonal multiple access (termed as D2D-UNOMA) is proposed and investigated. In D2D-UNOMA, two similar gain near users (NUs) and a far user (FU) can transmit their information to the base station (BS) in two time slots. The NUs can directly communicate with the BS, whereas the FU requires assistance of one of the NUs to facilitate the communication. In addition, as part of D2D communications, one of the NUs can transmit to the other NU in the first phase, whereas the FU can transmit to a NU in the second phase. The performance of D2D-UNOMA is studied in terms of ergodic rate along with analytical formulation. Through numerical results, it is demonstrated that the proposed D2D-UNOMA can ameliorate the ergodic sum rate significantly compared to the conventional orthogonal multiple access.

中文翻译：

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利用合作上行链路 NOMA 的同时蜂窝和 D2D 通信

提出并研究了一种利用非正交多址（称为 D2D-UNOMA）的新型设备到设备 (D2D) 辅助上行链路传输方案。在 D2D-UNOMA 中，两个相似增益的近端用户 (NU) 和远端用户 (FU) 可以在两个时隙内将其信息传输到基站 (BS)。NU可以直接与BS通信，而FU需要NU之一的协助来促进通信。此外，作为 D2D 通信的一部分，一个 NU 可以在第一阶段传输到另一个 NU，而 FU 可以在第二阶段传输到 NU。D2D-UNOMA 的性能在遍历率和分析公式方面进行了研究。通过数值结果，