摘要
随着移动物联网的发展,在移动场景下实现高速、低功耗的信息传递具有重要研究价值。反向散射通信作为一种低功耗的通信技术可以解决功耗与能量供应问题。NOMA(非正交多址接入)是实现高频谱效率的技术,基于用户之间信道增益差进行配对通信,但是当用户信道增益差过小时,会产生强干扰进而严重影响性能,而采用OMA(正交多址接入)可以降低干扰。针对移动场景中因信道增益频繁变化而导致的性能降低以及能量供应问题,构建了移动场景下反向散射混合多址系统模型,提出反向散射设备在移动场景中使用NOMA或OMA的动态阈值,以最大化复用NOMA提升速率,剩余设备则采用OMA,并在此基础上提出最佳信道增益差配对算法。仿真结果表明,在移动场景中相较于传统方法,和速率、中断概率、复用用户数都有显著提高,在小型无人机、无人船等方面具有应用价值。
With the development of the mobile Internet of Things(IoT),achieving high⁃speed and low⁃power information transmission in mobile scenarios has important research value.Backscattering communication,as a low⁃power communication technology,can solve the problems of power consumption and energy supply.NOMA(non⁃orthogonal multiple access)is a technology that achieves high frequency spectral efficiency,which implements paired communication based on the difference in channel gain between users.However,when the differences in channel gain between users are excessively small,strong interference will be generated,which affects performance seriously.Adopting OMA(orthogonal multiple access)can reduce the interference.In view of the performance degradation and energy supply issues caused by frequent changes in channel gain in mobile scenarios,a backscatter hybrid multiple access(HMA)system model is constructed.A dynamic threshold is proposed for backscatter devices to use NOMA or OMA in mobile scenarios to maximize the rate improvement of multiplexing NOMA,while OMA is adopted for the remaining devices.On this basis,the optimal channel gain difference pairing algorithm is proposed.The simulation results show that in mobile scenarios,the sum rate,outage probability and number of users who reuse products have increased significantly in comparison with the traditional methods.Therefore,the proposed algorithm has application value in small unmanned aerial vehicles,unmanned ships,and other fields.
作者
李世宝
刘正达
陆锐
LI Shibao;LIU Zhengda;LU Rui(College of Oceanography and Space Informatics,China University of Petroleum(East China),Qingdao 266580,China)
出处
《现代电子技术》
北大核心
2024年第5期8-14,共7页
Modern Electronics Technique
基金
国家自然科学基金项目(61972417)。
