论文标题
可重新配置智能表面辅助下行链路功率域Noma的BER分析
BER Analysis of Reconfigurable Intelligent Surface Assisted Downlink Power Domain NOMA
论文作者
论文摘要
近年来，在无线通信中使用软件受控的被动智能表面（RIS）吸引了许多研究人员。与传统信号的传统通信相比，RIS对电磁波的散射和反射特性具有一定程度的控制，因为由于传播信号的不可控制的散射及其与对象在propagaging介质中的相互作用，接收信号被降解。此外，在RIS辅助通信中，可以控制多个传入信号的阶段，以实现来自不同通道路径的多个信号的建设性添加，以提高信号与噪声比（SNR）。另一方面，非正交多访问（NOMA）可提供巨大的连通性和低潜伏期。功率域变体Noma使用具有不同幂的叠置编码符号，用于不同的用户符号。在本文中，提出了一种新颖的RIS辅助下行链路NOMA系统，通过结合RIS和NOMA的优点以提高系统的可靠性。分析表达式是针对拟议的RIS辅助功率域Noma系统的位错误率（BER）性能得出的。使用数值模拟结果分析了所提出系统的BER性能。据观察，所提出的系统的性能比常规的诺玛系统更好。
The use of software controlled passive Reconfigurable Intelligent Surface (RIS) in wireless communications has attracted many researchers in recent years. RIS has a certain degree of control over the scattering and reflection characteristics of the electromagnetic waves, compared to the conventional communications in which the received signal is degraded due to the uncontrollable scattering of the transmitted signal and its interaction with the objects in propagating medium. Further, in RIS assisted communications, the phases of the multiple incoming signals can be controlled to enable constructive addition of multiple signals from different channel paths to improve Signal to Noise Ratio (SNR). On the other hand, Non-Orthogonal Multiple Access (NOMA) provides massive connectivity and low latency. The power domain variant NOMA uses superposition coded symbols with different powers for different user symbols. In this paper, a novel RIS assisted downlink NOMA system is proposed by combining the merits of both RIS and NOMA to improve the reliability of the system. Analytical expressions are derived for the Bit Error Rate (BER) performance of the proposed RIS assisted power domain NOMA system. The BER performance of the proposed system is analyzed using the numerical simulation results. It is observed that the proposed system has better performance than the conventional NOMA system.
