中图分类号：TN971 文献标志码：A DOI: 10.16157/j.issn.0258-7998.267756
中文引用格式： 许国宏，王耀磊，徐林峰. 大功率相控阵短波发射系统数字预失真方案[J]. 电子技术应用，2026，52(9)：109-112.
英文引用格式： Xu Guohong，Wang Yaolei，Xu Linfeng. Digital predistortion scheme for high-power phased array shortwave transmission system[J]. Application of Electronic Technique，2026，52(9)：109-112.

Digital predistortion scheme for high-power phased array shortwave transmission system

Abstract： To address the nonlinear distortion issues in high-efficiency transmission for high-power phased array shortwave transmission systems, this study proposes a digital predistortion (DPD) scheme for phased array shortwave transmission systems based on a memory polynomial algorithm. The proposed scheme employs Fast Fourier Transform (FFT) technology to perform phase calibration on the 100% amplitude test signal from the coupled output of multiple solid-state transmitters in the system. It then uses a memory polynomial model to identify the nonlinear characteristics and implements real-time predistortion correction of the excitation baseband signal in the FPGA of the excitation device. Experimental results demonstrate that the proposed scheme effectively reduces the harmonic distortion across the entire frequency band to within 2%, achieves an amplitude asymmetry of better than 2%, and ensures carrier suppression superior to ±2%. This satisfies the system specifications outlined in the standard "Technical Requirements and Measurement Methods for Medium and Shortwave Amplitude Modulation Broadcast Transmitters" (GY/T 225-2007) and effectively addresses the issues of spectral regeneration and waveform distortion caused by the saturation characteristics of solid-state transmitters, significantly improving the system's transmission quality.

Key words : shortwave broadcasting；digital phased array；digital predistortion；memory polynomial；nonlinear correction；GY/T 225-2007