On the Spectral Efficiency and Security Enhancements of NOMA Assisted Multicast-Unicast Streaming
On the Spectral Efficiency and Security Enhancements of NOMA Assisted Multicast-Unicast Streaming
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NOMA辅助多播-单播流的频谱效率和安全增强
DOI：
10.1109/tcomm.2017.2696527
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发表时间：
2017-07-01
影响因子：
8.3
通讯作者：
Poor, H. Vincent
中科院分区：
文献类型：
--
作者：
Ding, Zhiguo;Zhao, Zhongyuan;Poor, H. Vincent
本文考虑非正交多址接入（NOMA）在混合多播和单播流量的多用户网络中的应用。所提出的波束成形和功率分配设计确保了单播性能的提高，同时保持了多播的接收可靠性。分析和仿真结果表明，与分别实现组播和单播服务的正交多址（OMA）方案相比，使用NOMA辅助的组播-单播方案可显着提高频谱效率。由于单播消息是向所有用户广播的，因此还研究了NOMA的使用如何防止那些组播接收者截获单播消息，结果表明NOMA实现的保密单播速率总是大于或等于OMA的保密单播速率。提供仿真结果来验证所开发的分析结果并证明所提出的 NOMA 方案的优越性能。
This paper considers the application of non-orthogonal multiple access (NOMA) to a multi-user network with mixed multicasting and unicasting traffic. The proposed design of beamforming and power allocation ensures that the unicasting performance is improved while maintaining the reception reliability of multicasting. Both analytical and simulation results are provided to demonstrate that the use of the NOMA assisted multicast-unicast scheme yields a significant improvement in spectral efficiency compared with orthogonal multiple access (OMA) schemes which realize multicasting and unicasting services separately. Since unicast messages are broadcast to all the users, how the use of NOMA can prevent those multicast receivers intercepting the unicasting messages is also investigated, where it is shown that the secrecy unicasting rate achieved by NOMA is always larger than or equal to that of OMA. Simulation results are provided to verify the developed analytical results and demonstrate the superior performance of the proposed NOMA scheme.