基于三通道QAM伪正交的调制无线系统  

Research on three-channel Quadrature Amplitude Modulation method

作　　者：尹晓冬 何小利 YIN Xiaodong;HE Xiaoli(College of Computer Science and Technology,Sichuan University of Science&Engineering,Zigong Sichuan 643002,China)

机构地区：[1]四川轻化工大学计算机科学与工程学院,四川自贡643002

出　　处：《太赫兹科学与电子信息学报》2025年第2期132-137,共6页Journal of Terahertz Science and Electronic Information Technology

基　　金：四川理工大学研究生创新基金资助项目(Y2022187)。

摘　　要：在无线通信技术的迅速发展中,正交幅度调制(QAM)已成为卫星通信和移动通信领域的关键调制技术。误码率(BER)作为评估无线通信系统可靠性的核心指标,研究降低BER的方法显得尤为重要。为优化QAM技术并降低BER,介绍了一种QAM改进方法。该方法的核心在于将传统的QAM技术中的2个正交载波信号,转换为3个在相同频带内相互伪正交的载波信号,这3个载波信号在调制后,会与1个数字信号进行叠加。通过这种设计,减少了每个信号所承载的数据量,从而在三维空间星座图中,任意2个点之间的最小距离得以最大化。这一改变不仅提升了噪声容限,还有效降低了系统的BER。为验证这一改进方法的有效性,将其与相移键控(PSK)和传统QAM进行仿真比较。仿真结果显示,提出的三通道QAM方法与理论预期的性能一致,验证了其在实际应用中的可行性和优势。In the rapid development of wireless communication technology,Quadrature Amplitude Modulation(QAM)has become a key modulation technique in the fields of satellite communication and mobile communication.The research on reducing the Bit Error Rate(BER)which is a core indicator for evaluating the reliability of wireless communication systems is particularly important.To optimize QAM technology and reduce BER,an improved method of QAM is introduced.The core of this method lies in transforming the two orthogonal carrier signals in traditional QAM technology into three pseudo-orthogonal carrier signals within the same frequency band.After modulation,these three carrier signals are superimposed with a digital signal.Through this design,the amount of data carried by each signal is reduced,thereby maximizing the minimum distance between any two points in the three-dimensional space constellation diagram.This change not only enhances the noise tolerance but also effectively reduces the system's BER.To verify the effectiveness of this improved method,it is simulated and compared with Phase-Shift Keying(PSK)and traditional QAM.The simulation results show that the proposed three-channel QAM method is consistent with the expected performance,verifying its feasibility and advantages in practical applications.

关 键 词：误码率(BER) 星座图 最小欧氏距离 调制解调 

分 类 号：TN761.93[电子电信—电路与系统]