非正交多址接入中叠加码调制与解调实验研究

Experimental research on modulation and demodulation of superposition code in Non⁃Orthogonal Multiple Access

作为下一代通信系统核心技术之一,非正交多址接入技术较难被学生直观地理解和掌握。为使学生紧跟通信技术发展前沿,有必要设计一套综合教学实验课程,使学生能够清晰直观地理解其工作流程及原理。针对现有基于时频域的正交多址实验无法体现非正交多址接入原理的问题,该实验采用模拟沙盘教学法,加深学生对传输流程和每个模块功能和工作原理的理解。在此基础上,基于自主设计和开发的软件无线电联合实验系统设计了三个具体的实验,使学生在实验过程中能够直观地观察功率域叠加信号的特征和调制过程,理解串行干扰抵消在多用户信号分离及解调中的作用,掌握基于功率域的非正交多址接入技术工作原理。

As one of the core technologies of next⁃generation communication systems,Non⁃Orthogonal Multiple Access(NOMA)technology is difficult for students to intuitively understand and master.To keep students abreast of the frontier of communication technology development,it is necessary to design a comprehensive teaching laboratory course for students to understand its working engineering and principles clearly and directly.To address the problem that existing time⁃frequency domain⁃based Orthogonal Multiple Access experiments cannot reflect the principle of Non⁃Orthogonal Multiple Access.This experiment introduce the simulation sandbox teaching method which deepens the students’understanding of each module’s the transmission process,the function and working principle.Three specific experiments are designed which based on software⁃defined radio joint experiment system to make students visualize the characteristics and modulation process of power domain superimposed signals.During the experiments,not only can students understand the role of Successive Interference Cancellation in multi⁃user signal separation and demodulation,but also master the working principle of power domain⁃based Non⁃Orthogonal Multiple Access technology.