基于数字预失真的短波功率放大器谐波和互调失真综合抵消方法

IF 2.9 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Microwave and Wireless Components Letters Pub Date : 2022-10-01 DOI:10.1109/LMWC.2022.3174045

Jijun Ren, Xing Wang, Qinqin Cheng

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引用次数: 3

摘要

在使用短波功率放大器进行远距离通信时，由于放大器的非线性和记忆效应，放大器的输出会产生谐波失真和互调失真(IMD)等一系列带内和带外频谱干扰问题。现有的谐波抵消方法包括使用滤波器组进行谐波抵消和数字谐波抵消，但这些方法要么增加了额外的硬件资源，要么只用于谐波抵消，而忽略了互调。在分析Volterra级数的基础上，提出谐波抵消记忆多项式(HCMP)模型。实验结果表明，在相同的模型复杂度下，与GMP模型相比，HCMP模型提高了不同频率点的谐波抵消能力，其中二次谐波提高约8 dB，三次谐波提高12 dB以上。同时，HCMP模型的IMD5和IMD7抵消性能比GMP模型分别好1.6 dB和4 dB左右。

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An Integrated Cancelling Method of Harmonic and Intermodulation Distortion of Short-Wave Power Amplifier Based on Digital Predistortion

When using short-wave power amplifiers (PAs) for long-distance communication, the output of the amplifier will have a series of in-band and out-of-band spectral interference problems introduced by harmonic distortion and intermodulation distortion (IMD) because of the nonlinearity and memory effect of the amplifier. The existing harmonic cancellation methods include the use of filter banks for harmonic cancellation and digital harmonic cancellation, but these methods will either increase additional hardware resources or only work for harmonic cancellation, neglecting intermodulation. Based on the analysis of the Volterra series, the harmonic cancellation memory polynomial (HCMP) model is proposed. Experimental results show that at the same model complexity, compared with GMP model, the HCMP model has improved the harmonic cancellation ability at different frequency points, in which the second harmonic improved by about 8 dB and the third harmonic improved by more than 12 dB. Meanwhile, the IMD5 and IMD7 cancellation performance of the HCMP model is about 1.6 and 4 dB better than that of the GMP model.

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来源期刊

IEEE Microwave and Wireless Components Letters 工程技术-工程：电子与电气

自引率

13.30%

发文量

376

审稿时长

3.0 months

期刊介绍： The IEEE Microwave and Wireless Components Letters (MWCL) publishes four-page papers (3 pages of text + up to 1 page of references) that focus on microwave theory, techniques and applications as they relate to components, devices, circuits, biological effects, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technical, medical and industrial activities. Microwave theory and techniques relates to electromagnetic waves in the frequency range of a few MHz and a THz; other spectral regions and wave types are included within the scope of the MWCL whenever basic microwave theory and techniques can yield useful results. Generally, this occurs in the theory of wave propagation in structures with dimensions comparable to a wavelength, and in the related techniques for analysis and design.