Capacity Enhancement of D2D Aided Coordinated Direct and Relay Transmission Using NOMA
Capacity Enhancement of D2D Aided Coordinated Direct and Relay Transmission Using NOMA
复制标题
使用 NOMA 增强 D2D 辅助协调直接和中继传输的容量
DOI：
10.1109/lcomm.2020.3000996
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
He Bingtao
中科院分区：
文献类型：
--
作者：
Zou Lisha;Chen Jian;Lv Lu;He Bingtao
This letter investigates a device-to-device (D2D) communication aided coordinated direct and relay transmission (CDRT) using non-orthogonal multiple access (NOMA) framework, where a cell-center user (CU) is served by a base station (BS) directly while a cell-edge user (EU) needs the help of a relaying user (RU) to communicate with BS. Specifically, with the use of the NOMA principle, we propose to exploit a D2D communication link from RU to CU for transmitting a new signal during the information forwarding of RU in the second phase, so as to enhance the network spectrum efficiency. Analytical closed-form expressions of the system ergodic sum capacity are derived and verified by computer simulations. Both analytical and simulation results demonstrate that the D2D aided NOMA scheme achieves higher sum rates than the conventional CDRT scheme and orthogonal multiple access (OMA) scheme.
