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| 1 | PLL DEMODULATION TECHNIQUE FOR M-RAY POSITION PHASE SHIFT KEYING显示文摘The paper presents a kind of transmission system which employs M-ary Position Phase Shift Keying(MPPSK) to send data and Phase Locked Loop(PLL) based techniques for data retrieve.With a single PLL, MPPSK demodulation is achieved, as well as carrier recovery and symbol synchronization.Firstly, MPPSK modulation method is briefly introduced.2PPSK's PSD expression is given with its optimization result.Orthogonal Phase Detector(PD) and static threshold are used for the purpose of wider phase range and simplicity in demodulation.The data rate is alterable, which is 4.65 kbps for 2PPSK and 9.3 kbps for 4PPSK in the paper.Then some indicative comparisons in Signal to Noise Ratio Symbol Error Rate(SNR-SER) are made among 2PPSK, 3PPSK and 4PPSK, of which 4PPSK has proved to be optimal in ten slots each symbol conditions.And finally, it is demonstrated by system simulations that lower than 10-4 Symbol Error Rate(SER) performance can be obtained at 13 dB symbol SNR. | Qi Chenhao Wu Lenan | 2009 | Journal of Electronics(China)2009，26，3： | 10 |
| 2 | Flexible control strategy for HVDC transmission system adapted to intermittent new energy delivery显示文摘Intermittent new energy delivery requires increasing the flexibility of ultra-high voltage direct current(DC)power adjustment.Based on a converter steady-state model and a DC power model,the control angle constraints of a converter valve are relaxed for power regulation.In this paper,a flexible DC power control method based on a fixed tap changer position is proposed.The initial ratio of the converter transformer is optimized.The effects of the fixed-tap changer position control on the control angle,reactive power compensation,and commutation failure are analyzed.The new control method allows a DC system to operate at a large angle and increase the additional reactive power loss while improving the commutation security margin.Steady-state and electromagnetic transient simulations in the CIGRE test system verify the validity of the method proposed in this paper and the correctness of the analysis conclusions. | Chenhao Li Kuan Li Changhui Ma Pengfei Zhang Qi Tao Yingtao Sun Xin Wang | 2021 | Global Energy Interconnection2021，4，4： | 6 |
| 3 | Linear polarization holography显示文摘Polarization holography is a newly researched field,that has gained traction with the development of tensor theory.It primarily focuses on the interaction between polarization waves and photosensitive materials.The extraordinary capabil-ities in modulating the amplitude,phase,and polarization of light have resulted in several new applications,such as holo-graphic storage technology,multichannel polarization multiplexing,vector beams,and optical functional devices.In this paper,fundamental research on polarization holography with linear polarized wave,a component of the theory of polariz-ation holography,has been reviewed.Primarily,the effect of various polarization changes on the linear and nonlinear po-larization characteristics of reconstructed wave under continuous exposure and during holographic recording and recon-struction have been focused upon.The polarization modulation realized using these polarization characteristics exhibits unusual functionalities,rendering polarization holography as an attractive research topic in many fields of applications.This paper aims to provide readers with new insights and broaden the application of polarization holography in more sci-entific and technological research fields. | Jinyu Wang Xiaodi Tan Peiliang Qi Chenhao Wu Lu Huang Xianmiao Xu Zhiyun Huang Lili Zhu Yuanying Zhang Xiao Lin Jinliang Zang Kazuo Kuroda | 2022 | Opto-Electronic Science2022，1，2： | 3 |
| 4 | Acquisition of channel state information for mm Wave massive MIMO: traditional and machine learning-based approaches显示文摘The accuracy of channel state information(CSI) acquisition directly affects the performance of millimeter wave(mmWave) communications. In this article, we provide an overview on CSI acquisition,including beam training and channel estimation for mmWave massive multiple-input multiple-output systems.The beam training can avoid the estimation of a high-dimension channel matrix, while the channel estimation can flexibly exploit advanced signal processing techniques. In addition to introducing the traditional and machine learning-based approaches in this article, we also compare different approaches in terms of spectral efficiency, computational complexity, and overhead. | Chenhao QI Peihao DONG Wenyan MA Hua ZHANG Zaichen ZHANG Geoffrey Ye LI | 2021 | Science China(Information Sciences)2021，64，8： | 3 |
| 5 | Analysis and optimization of power spectrum on EBPSK modulation in throughput-efficient wireless system显示文摘 | Feng Man Qi Chenhao Wu Lenan | 2008 | Journal of Southeast University:English Edition2008，24，14： | 1 |
| 6 | Optimized pilot placement for sparse channel estimation in OFDM systems显示文摘 | Qi Chenhao Wu Lenan | 2011 | IEEE Signal Processing Letters2011，18，12： | 1 |
| 7 | Tree-based backward pilot generation for sparse channel estimation显示文摘 | Qi Chenhao Wu Lenan | 2012 | Electronics Letters2012，48，9： | 1 |
| 8 | Analysis and optimization of power spectrum on EBPSK modulation in throughput-efficient wireless system 显示文摘 | Feng Man Qi Chenhao Wu Lenan | 2008 | Journal of Southeast University (English Edition) (S0567-7718)2008，24，2： | 1 |
| 9 | Optimized pilot placement forsparse channel estimation in OFDM systems 显示文摘 | QI Chenhao WU Lenan | 2011 | IEEESignal processing letters2011，18，12： | 1 |
| 10 | A hybrid compressing sensing algorithm for sparse channel estimation in MIMO OFDM systems显示文摘 | Chenhao Qi Lenan Wu | 2011 | IEEE Transactions on Signal Processing2011，58，1： | 1 |
| 11 | Recent pa- tents on ultra narrow band modulations 显示文摘 | Wu Lenan Feng Man Qi Chenhao | 2011 | Recent Pa- tents on Signal Processing2011，1，1： | 1 |
| 12 | Recent patents on ultra narrow band modulations显示文摘 | WU Lenan FENG Man QI Chenhao | 2011 | Recent Patents on Signal Processing2011，1，1： | 1 |
| 13 | A study of deterministic pilot al- location for sparse channel estimation in OFDM systems 显示文摘 | QI Chenhao WU Lenan | 2012 | IEEE communications letters2012，16，5： | 1 |
| 14 | Analysis and optimization of power spectrum on EBPSK modulation in throughputefficient wireless system 显示文摘 | Feng Man Qi Chenhao Wu Lenan | 2008 | Journal of Southeast University2008，24，2： | 1 |
| 15 | A study of deterministic pilot allocation for sparse channel estimation in OFDM System显示文摘 | Qi Chenhao Wu Lenan | 2012 | IEEE Communication Letters2012，16，5： | 1 |
| 16 | A study of deterministic pilotallocation for sparse channel estimation in OFDMsystems 显示文摘 | Qi Chenhao Wu Lenan | 2012 | IEEE Communications Letters2012，16，5： | 1 |
| 17 | Pilot designfor sparse channel estimation in OFDM-based cognitiveradio systems 显示文摘 | Qi Chenhao Yue Guosen Wu Lenan | 2014 | IEEE Transactions on VehicularTechnology2014，63，2： | 1 |
| 18 | Pilot design schemes for sparse channel estimation in OFDM systems显示文摘 | Chenhao Qi Guosen Yue Lenan Wu | 2015 | IEEE Transactions on Vehicular Technology2015，64，4： | 1 |
| 19 | Sparse channel estimation for wavelet-based underwater acoustic communications显示文摘 | Qi Chenhao Wu Lenan | 2012 | Transactions on Emerging Telecommunications Technologies2012，23，8： | 1 |
| 20 | A Hybrid Compressing Sensing Algorithm for Sparse Channel Estimation in MIMO- OFDM Systems显示文摘 | Chenhao Qi Lenan Wu | 2011 | IEEE Transactions on Signal Processi ng2011，58，01： | 1 |
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