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A Fast Two-Tone Active Load-Pull Algorithm for Assessing the Non-linearity of RF Devices

Chinese Journal of Electronics 2022年第1期31卷 25-32页

作者： SU Jiangtao CAI Jialing ZHENG Xing SUN Lingling Key Laboratory of RF Circuits and Systems Ministry of Education Key Laboratory of Large Scale Integrated Circuits Design Zhejiang Province

Radio frequency(RF) devices used in modern wireless systems must meet increasingly complicated spectral constraints while still operating with high power efficiency. A fast real-time two-tone active loadpull algorithm is proposed to assess the relationship between nonlinear performance with associated device load impedance variations. This algorithm employs real time measurement data to extract two-tone local nonlinear behaviour model, which is further used for the prediction of injected signal value in the active real-time loadpull system, therefore minimizing the number of iterations required for load emulation. The proposed method was validated on a real two-tone load-pull measurement bench using off-the-shelf instruments. The result shows that the measurement speed has been greatly increased without sacrifice of the impedance emulation *** intelligent two-tone load-pull algorithm is expected to be applied in the designing of modern communication system and radar transmitters, as well as the validation of the models of radio frequency transistors.

关键词： measurement speed real-time load-pull system spectral constraints radio frequency transistors real time measurement data intelligent two-tone load-pull algorithm two-tone local nonlinear behaviour model radio frequency devices impedance emulation accuracy modern communication system modern wireless systems nonlinearity radiocommunication RF devices associated device load impedance variations radar transmitters injected signal value two-tone load-pull measurement bench load emulation high power efficiency fast real-time two-tone active load-pull algorithm nonlinear performance

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Radio Disturbance Suppression for Ground Wave radar

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Journal of Systems Engineering and Electronics 1994年第2期5卷 1-11页

作者： Qiao, Xiaolin Liu, Yongtan Harbin Inst of Technology Harbin China

A new method of single sample polarization filtering is proposed. The algorithm is fast and suitable for the polarization processing of stationary or nonstationary polarized disturbed signals with one or more independent disturbances. A ground wave polarimetric radar with the ability of radio disturbance suppression is then introduced. Some numerical results demonstrate the effectiveness of single sample polarization filtering method for ground wave polarimetric radar.

关键词： Algorithms Attenuation Electromagnetic wave polarization Interference suppression Polarimeters radar countermeasures radar interference radar transmitters Signal filtering and prediction Telecommunication equipment

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