论文标题
智能反映表面辅助的多个访问用户配对：Noma还是OMA？
Intelligent Reflecting Surface-Assisted Multiple Access with User Pairing: NOMA or OMA?
论文作者
论文摘要
智能反射表面（IRS）与多个访问网络的集成是提高光谱/能源效率和扩大网络覆盖/连接的成本效益的解决方案。但是，由于国税局在重新配置无线传播通道方面具有新的能力，因此从根本上未知哪种多重访问方案在IRS辅助无线网络中优越。在这封信中，我们在IRS辅助下行链路通信中进行了非正交多重访问（NOMA）和正交多访问（OMA）之间的理论性能比较，为此，在每个IRS元素的离散单位模型重新构造约束下，传输最小化问题是在该链接中提出的。我们分析了不同多个访问方案所需的最小传输功率，并以数值进行比较，事实证明，在没有IRS的常规系统中，NOMA比OMA的定型优势完全符合。此外，为了避免蛮力搜索最佳离散IRS相偏移的指数复杂性，我们提出了一种低复杂的解决方案，以实现近乎最佳的性能。
The integration of intelligent reflecting surface (IRS) to multiple access networks is a cost-effective solution for boosting spectrum/energy efficiency and enlarging network coverage/connections. However, due to the new capability of IRS in reconfiguring the wireless propagation channels, it is fundamentally unknown which multiple access scheme is superior in the IRS-assisted wireless network. In this letter, we pursue a theoretical performance comparison between non-orthogonal multiple access (NOMA) and orthogonal multiple access (OMA) in the IRS-assisted downlink communication, for which the transmit power minimization problems are formulated under the discrete unit-modulus reflection constraint on each IRS element. We analyze the minimum transmit powers required by different multiple access schemes and compare them numerically, which turn out to not fully comply with the stereotyped superiority of NOMA over OMA in conventional systems without IRS. Moreover, to avoid the exponential complexity of the brute-force search for the optimal discrete IRS phase shifts, we propose a low-complexity solution to achieve near-optimal performance.
