面向高频段非理想信道的星座图智能优化设计方法  

Intelligent optimization method for constellation design in high-frequency non-ideal channels

作　　者：李建国 韩春涛 冯晰宇 叶能[1] 杨凯[2] LI Jianguo;HAN Chuntao;FENG Xiyu;YE Neng;YANG Kai(School of Cyberspace Science and Technology,Beijing Institute of Technology,Beijing 100081,China;School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学网络空间安全学院,北京100081 [2]北京理工大学信息与电子学院,北京100081

出　　处：《信息对抗技术》2024年第6期35-46,共12页Information Countermeasure Technology

基　　金：国家自然科学基金资助项目(62101048,62171030)。

摘　　要：随着通信系统不断向更高频段和更大带宽方向发展,硬件非理想性的影响愈发显著,尤其是功放非线性和相位噪声导致的信号畸变问题。为改善这一状况,提出了一种基于正交幅度调制(quadrature amplitude modulation,QAM)投影的人工智能辅助星座图设计方案。首先,借助基于离散傅里叶扩展正交频分复用(discrete Fourier transform spread orthogonal frequency division multiplexing,DFT-s-OFDM)驱动的神经网络模型,在非理想信道和时频性能指标损失等多重约束下进行星座学习,以降低系统误码率。随后,根据所提出的最小加权径角距离准则,将优化后的星座投影到QAM上,从而设计抗硬件非理想性强,且兼容现有体制的N-nMod_M-QAM星座。仿真结果表明,在相位噪声影响的信道下,提出的星座调制方案在性能增益和鲁棒性方面均优于同阶QAM、幅度相移键控(amplitude-phase-shift keying,APSK)以及螺旋调制。With the continuous development of communication systems towards higher frequency and larger bandwidths,the impact of hardware non-idealities,such as signal distortion caused by power amplifier nonlinearity and phase noise,has become increasingly significant.In an effort to address this challenge,this paper introduces an artificial intelligence-guided constellation design scheme based on quadrature amplitude modulation(QAM)projection.With the objective of reducing the bit error rate,a neural network model based on discrete Fourier transform spread orthogonal frequency division multiplexing(DFT-s-OFDM)is utilized to facilitate constellation learning under multiple constraints,including non-ideal channels and time-frequency performance loss.Subsequently,the optimized constellation is projected onto QAM based on the proposed minimum radial-angular weighted distance,thus designing an N-nMod_M-QAM constellation that is resistant to hardware non-ideality and compatible with existing systems.Simulation results show that under phase noise channel,the proposed constellation modulation scheme outperforms the same-order QAM,amplitude-phase-shift keying(APSK)and spiral modulation in terms of performance gain and robustness.

关 键 词：星座图设计 人工智能 功率放大器 相位噪声 正交幅度调制 幅度相移键控 螺旋星座 

分 类 号：TN928[电子电信—通信与信息系统]