IRS-NOMA辅助多用户协作中继系统性能分析

Performance Analysis for IRS-NOMA Aided Multi-User Cooperative Relay System

随着第五代(The Fifth Generation,5G)通信技术的大规模应用,在网设备的数量迅速增长,带来了巨大的数据流量和连接需求。尽管5G通信技术已经显著提高了传输速率和网络容量,但随着物联网(Internet of Things,IoT)设备的普及和高速数据业务的增加,现有的频段资源已经难以满足未来的需求。预测显示,第六代(The Sixth Generation,6G)通信技术的峰值传输速率将提升到1太比特每秒,约为5G的100倍。这种大幅度的速率提升将进一步加剧对带宽的需求,使得现有频段无法满足新型高速业务及大规模物联网终端的需求。因此,未来通信技术向更高频段拓展成为必然。在这种背景下,本文提出了一种将智能反射面(Intelligent Reflecting Surface,IRS)技术引入到非正交多址接入(Non-Orthogonal Multiple Access,NOMA)中继网络的新型多用户中继系统的方案,将IRS控制器与中继器整合,构建一个新的中继节点,实现对信号的中继转发,并发挥IRS的辅助通信作用,重构中继节点,使其不仅能够进行信号放大和转发,还可以通过IRS对信号质量和系统容量进一步提升。本文对下行侧的理论分析和仿真结果表明,加入IRS后系统性能平均提升了30%。这一显著的性能提升证明了IRS技术在NOMA中继网络中的应用潜力,为未来智能反射面的推广应用提供了新的思路和方法。随着6G时代的到来,智能反射面技术有望在更高频段的通信系统中发挥更大的作用,进一步推动无线通信技术的发展与进步。

With the large-scale application of fifth-generation(5G)communication technology,the number of devices connected to the network has grown rapidly,leading to enormous data traffic and connectivity demands.Although 5G technology has significantly increased transmission rates and network capacity,the widespread adoption of Internet of Things(IoT)devices and the rise of high-speed data services have made the current frequency bands insufficient to satisfy future demands.Predictions indicate that the peak transmission rate of sixth-generation(6G)communication technology will increase to 1 terabit per second,approximately 100 times that of 5G.This substantial increase in speed will further exacerbate the demand for bandwidth,making it inevitable that existing frequency bands will be unable to satisfy the requirements of new high-speed services and large-scale IoT terminals.Therefore,the future development of communication technology must expand to higher frequency bands.Against this backdrop,in this study,a novel multi-user relay system,which integrates intelligent reflecting surface(IRS)technology into non-orthogonal multiple access(NOMA)relay networks,is proposed.IRS is an emerging technology that can significantly improve the performance of wireless communication systems by intelligently controlling the phase,amplitude,and polarization of reflected signals.By applying IRS technology to NOMA relay networks,we can completely leverage its intelligent control capabilities to enhance the spectral and energy efficiency of the system.Specifically,we integrate IRS controllers with relays to create a new relay node that not only amplifies and forwards signals but also optimizes the signal path through IRS,reducing interference and improving signal quality and system capacity.Theoretical analysis and simulation results on the downlink side demonstrate that the system performance improves by an average of 30%after incorporating IRS.This significant performance enhancement proves the potential of IRS technology in NOMA relay networks,providing new ideas and methods for future applications.With the advent of the 6G era,IRS technology is expected to play a more significant role in higher frequency communication systems.This,in turn,will further promote the development and progress of wireless communication technology.