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您的检索式：作者名="Shanxiang Liu"
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| 1 | MIMO SAR Waveform Separation Based on Costas-LFM Signal and Co-arrays for Maritime Surveillance显示文摘In case of bright targets over a dark background, the cross-correlation noise of Multiple input and multiple output(MIMO) Synthetic aperture radar(SAR) orthogonal waveforms in the same frequency coverage will increase which can degrade the image. An Interpulse Costas hopping and intra-pulse Slope coded linearly frequency modulated(IPC-SCLFM) waveform is designed and analyzed to decrease the autocorrelation and cross-correlation noise. Besides a novel acquisition mode of 'MIMO Coprime SAR'(MIMO-Cop SAR) is proposed with Coprime arrays(Co-arrays) in receive across the SAR line of flight based on digital beamforming. An improved processing by multiplying values at each pixel of two coarrays images is proposed to suppress the cross-correlation noise. MIMO-Cop SAR can effectively suppress the crosscorrelation noise, reduce the amount of data to be stored and get high signal-to-noise ratio in a simple way. The effectiveness of MIMO-Cop SAR for maritime surveillance is demonstrated by the simulation experiments. | LIU Feng MU Shanxiang LYU Wanghan LI Wenliang GE Ting | 2017 | Chinese Journal of Electronics2017，26，1： | 5 |
| 2 | Quantum-safe cryptography:crossroads of coding theory and cryptography显示文摘We present an overview of quantum-safe cryptography(QSC)with a focus on post-quantum cryptography(PQC)and information-theoretic security.From a cryptographic point of view,lattice and code-based schemes are among the most promising PQC solutions.Both approaches are based on the hardness of decoding problems of linear codes with different metrics.From an information-theoretic point of view,lattices and linear codes can be constructed to achieve certain secrecy quantities for wiretap channels as is intrinsically classical-and quantum-safe.Historically,coding theory and cryptography are intimately connected since Shannon’s pioneering studies but have somehow diverged later.QSC offers an opportunity to rebuild the synergy of the two areas,hopefully leading to further development beyond the NIST PQC standardization process.In this paper,we provide a survey of lattice and code designs that are believed to be quantum-safe in the area of cryptography or coding theory.The interplay and similarities between the two areas are discussed.We also conclude our understandings and prospects of future research after NIST PQC standardisation. | Jiabo WANG Ling LIU Shanxiang LYU Zheng WANG Mengfan ZHENG Fuchun LIN Zhao CHEN Liuguo YIN Xiaofu WU Cong LING | 2022 | Science China(Information Sciences)2022，65，1： | 1 |
| 3 | Construction of alkyl-substituted 7-norbornenones through Diels-Alder cycloaddition of electron-deficient olefins and a cyclopentadienone derivative generated in situ显示文摘Dimeric sesquiterpenoids possessing densely substituted 7-norbornenone/7-norbornenol motifs pose a considerable challenge for chemical synthesis. From a strategic perspective, one could envision intermolecular Diels-Alder cycloaddition as a straightforward method for assembling alkyl-substituted 7-norbornenones. However, this approach is hindered by lability of the required dienes, namely alkylsubstituted cyclopentadienones. Here we report a one-pot protocol for construction of alkyl-substituted7-norbornenones from electron-deficient olefins and a cyclopentenone derivative. DDQ was found to be an effective oxidant for generating a cyclopentadienone intermediate in situ from the enone. A series of sterically congested 7-norbornenone-containing polycyclic compounds were prepared by using this protocol. | Shanxiang Liu Jinxin Wang Yuyong Ma Xin Cao Wei-Dong Zhang Ang Li | 2022 | Chinese Chemical Letters2022，33，4： | 0 |
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