反向散射中基于载波索引的混合NOMA方案  

Hybrid NOMA Scheme Based on Subcarrier Index Modulation in Backscatter

作　　者：李世宝[1] 陆锐 LI Shibao;LU Rui(College of Oceanography and Space Informatics,China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中国石油大学(华东)海洋与空间信息学院,山东青岛266580

出　　处：《无线电工程》2024年第1期41-46,共6页Radio Engineering

基　　金：国家自然科学基金(61972417)。

摘　　要：基于功率域非正交多址的环境反向散射通信系统上行链路常通过距离差完成用户配对。无源反向散射系统的双重信道衰落,导致远端边缘设备无法满足通信所需功率或解码所需信干噪比(Signal-to-Interference-Noise Ratio,SINR)约束。为了解决上述问题,提出一种OFDM和具有索引调制(Index Modulation,IM)的OFDM混合的上行NOMA方案,该方案由标签调制方案和反射系数调节方案组成。OFDM-IM提供了更好的能量效率,可以使功率水平低的设备满足通信条件。反向散射设备(Backscatter Devices,BD)根据接收到的功率水平,灵活地选择OFDM或者OFDM-IM,并在功率域叠加;通过调节反射系数保证叠加信号的功率差,接收机利用功率电平来执行多用户检测。实验结果表明,该方能够有效地提高远端用户解码的成功率,并且解码用户数量的增加提高了系统容量。The uplink of an environmental backscattering communication system based on NOMA in the power domain often completes user pairing through distance.The dual channel fading of the passive backscattering system makes the remote edge devices unable to meet the communication power demands or the minimum Signal-to-Interference-Noise Ratio(SINR)constraint for decoding.In order to solve the above problems,a hybrid uplink NOMA scheme of OFDM and OFDM with Index Modulation(IM)is proposed,which is composed of a tag modulation scheme and a reflection coefficient adjustment scheme.OFDM-IM provides better energy efficiency and enables devices with low power level to meet communication conditions.The Backscatter Devices(BD)flexibly selects OFDM or OFDM-IM according to the received power level,and superimposes them in the power domain.By adjusting the reflection coefficient to ensure the power difference of superimposed signals,the receiver uses the power level to perform multi-user detection.The experimental results show that the scheme can effectively improve the success rate of remote user decoding,and the increase in the number of decoding users improves the system capacity.

关 键 词：反向散射 非正交多址接入 索引调制 多载波 

分 类 号：TN929.5[电子电信—通信与信息系统]