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Sparse Bayesian Learning Based Off-Grid Estimation of OTFS Channels with Doppler Squint

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TSINGHUA SCIENCE AND TECHNOLOGY 2024年第6期29卷 1821-1828页

作者： wang, Xuehan Shi, Xu wang, jintao Tsinghua Univ Dept Elect Engn Beijing 100084 Peoples R China

Orthogonal Time Frequency Space (OTFS) modulation has exhibited significant potential to further promote the performance of future wireless communication networks especially in high-mobility scenarios. In practical OTFS systems, the subcarrier-dependent Doppler shift which is referred to as the Doppler Squint Effect (DSE) plays an important role due to the assistance of time-frequency modulation. Unfortunately, most existing works on OTFS channel estimation ignore DSE, which leads to severe performance degradation. In this letter, OTFS systems taking DSE into consideration are investigated. Inspired by the input-output analysis with DSE and the embedded pilot pattern, the sparse Bayesian learning based parameter estimation scheme is adopted to recover the delay-Doppler channel. Simulation results verify the excellent performance of the proposed off-grid estimation approach considering DSE.

关键词： Channel estimation Symbols OFDM Estimation Time-frequency analysis Delays Bayes methods orthogonal time frequency space modulation Doppler squint effect channel estimation sparse Bayesian learning

Research and application of kapok fiber as an absorbing material: A mini review

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Journal of Environmental Sciences 2015年第1期27卷 21-32页

作者： Yian Zheng jintao wang Yongfeng Zhu Aiqin wang Center of Eco-materials and Green Chemistry Lanzhou Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

Kapok fiber corresponds to the seed hairs of the kapok tree（Ceiba pentandra）, and is a typical cellulosic fiber with the features of thin cell wall, large lumen, low density and hydrophobic–oleophilic properties. As a type of renewable natural plant fiber, kapok fiber is abundant,biocompatible and biodegradable, and its full exploration and potential application have received increasing attention in both academic and industrial fields. Based on the structure and properties of kapok fiber, this review provides a summary of recent research on kapok fiber including chemical and physical treatments, kapok fiber-based composite materials, and the application of kapok fiber as an absorbent material for oils, metal ions, dyes, and sound,with special attention to its use as an oil-absorbing material, one predominant application of kapok fiber in the coming future.

关键词： Kapok fiber Pretreatment Composite material Absorbing materials

Influence of environmental data of different sources on marine species habitat modeling:A case study for Ommastrephes bartramii in the Northwest Pacific Ocean

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Acta Oceanologica Sinica 2022年第1期41卷 76-83页

作者： Lin Lei jintao wang Xinjun Chen College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources of Ministry of Education Shanghai OceanShanghai 201306China National Engineering Research Centre for Oceanic Fisheries Shanghai Ocean UniversityShanghai 201306China Key Laboratory of Oceanic Fisheries Exploration Ministry of Agriculture and Rural AffairsShanghai 201306China Scientific Observing and Experimental Station of Oceanic Fishery Resources Ministry of Agriculture and Rural AffairsShanghai 201306China

The quality of environmental data and its possible impact on the marine species habitat modelling are often overlooked while the sources for these data are *** study selected sea surface temperature(SST)from two commonly used sources,the NOAA Ocean Watch and IRI/LDEO Climate Data Library,and then constructed habitat suitability index model to evaluate the influences of SST from the two sources on the outcomes of Ommastrephes bartramii habitat models for the months of July–October in the Northwest Pacific Ocean during 1996–*** study examined the differences in the amount of estimated unfavourable/favourable habitat area when the SST used for model building and inference were the same or *** in suitable habitat area calculated from SST was insensitive to the two different SST *** the fishing season of ***,the changes of magnitude and trend of monthly suitable habitat area in August and September were similar over time,whereas there were large differences for July and ***,there is a substantial lack of consistency in the *** habitat distribution based on SST of two *** study considered the sources of environmental data for habitat modelling and then inferred species habitat distribution whether by the same or different data source.

关键词： habitat suitability index model environmental data Ommastrephes bartramii Northwest Pacific Ocean

Anti-interference self-alignment algorithm by attitude optimization estimation for SINS on a rocking base

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Journal of Systems Engineering and Electronics 2023年第5期34卷 1333-1342页

作者： XUE Haijian wang Tao CAI Xinghui wang jintao LIU Fei High-Tech Institute of Xi’an Xi’an 710025China Military Representative Office of Rocket Army Equipment Department Qingdao 266071China

The performance of a strapdown inertial navigation system(SINS)largely depends on the accuracy and rapidness of the initial alignment.A novel anti-interference self-alignment algorithm by attitude optimization estimation for SINS on a rocking base is presented in this *** algorithm transforms the initial alignment into the initial attitude determination problem by using infinite vector observations to remove the angular motions,the SINS alignment is heuristically established as an optimiza-tion problem of finding the minimum *** order to further improve the alignment precision,an adaptive recursive weighted least squares(ARWLS)curve fitting algorithm is used to fit the translational motion interference-contaminated reference vectors according to their time domain *** studies and experimental results favorably demonstrate its rapidness,accuracy and robustness.

关键词： strapdown inertial navigation system(SINS) initial alignment anti-interference rocking base adaptive recursive weighted least squares(ARWLS)

Convergence of Broadband and Broadcast/Multicast in Maritime Information Networks

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Tsinghua Science and Technology 2021年第5期26卷 592-607页

作者： Jun Du Jian Song Yong Ren jintao wang the Department of Electronic Engineering Tsinghua UniversityBeijing 100084China the Institute for Ocean Engineering Tsinghua UniversityBeijing 100084 Peng Cheng Laboratory Shenzhen 518055China the Beijing National Research Center for Information Science and Technology Tsinghua UniversityBeijing 100084 the Key Laboratory of Digital TV System of Guangdong Province and Shenzhen City Research Institute of Tsinghua UniversityShenzhen 518057China

Recently,the fifth-generation(5G)of wireless networks mainly focuses on the terrestrial ***,the well-developed emerging technologies in 5G are hardly applied to the maritime communications,resulting from the lack of communication infrastructure deployed on the vast ocean,as well as different characteristics of wireless propagation environment over the sea and maritime user *** satisfy the expected plethora of broadband communications and multimedia applications on the ocean,a brand-new maritime information network with a comprehensive coverage capacity in terms of all-hour,all-weather,and all-sea-area has been expected as a revolutionary paradigm to extend the terrestrial capacity of enhanced broadband,massive access,ultra-reliable,and low-latency to the vast *** considering the limited available resource of maritime communication infrastructure,the convergence of broadband and broadcast/multicast can be regarded as a possible yet practical solution for realizing an efficient and flexible resource configuration with high quality of ***,according to such multi-functionality and all-coverage maritime information network,the monitoring and sensing of vast ocean area relying on massive Ocean of Things and advanced radar techniques can be also *** these issues above,this study proposes a Software Defined Networking(SDN)based Maritime Giant Cellular Network(MagicNet)architecture for broadband and multimedia *** on this network,the convergence techniques of broadband and broadcast/multicast,and their supporting for maritime monitoring and marine sensing are also introduced and surveyed.

关键词： Maritime Giant Cel ular Network(Magic Net) integrated broadcast-multicast-unicast communications maritime multimedia services Ocean of Things(OoT) al-coverage

Projecting distributions of Argentine shortfin squid(Illex argentinus)in the Southwest Atlantic using a complex integrated model

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Acta Oceanologica Sinica 2018年第8期37卷 31-37页

作者： wang jintao CHEN Xinjun CHEN Yong College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China Collaborative Innovation Center for Distant-water Fisheries Shanghai 201306China National Engineering Research Centre for Oceanic Fisheries Shanghai Ocean UniversityShanghai 201306China Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources of Ministry of Education Shanghai Ocean UniversityShanghai 201306China School of Marine Sciences University of MaineOronoMaine 04469USA

We developed an approach that integrates generalized additive model（GAM） and neural network model（NNM）for projecting the distribution of Argentine shortfin squid（Illex argentinus）. The data for this paper was based on commercial fishery data and relevant remote sensing environmental data including sea surface temperature（SST）, sea surface height（SSH） and chlorophyll a（Chl a） from January to June during 2003 to 2011. The GAM was used to identify the significant oceanographic variables and establish their relationships with the fishery catch per unit effort（CPUE）. The NNM with the GAM identified significant variables as input vectors was used for predicting spatial distribution of CPUE. The GAM was found to explain 53.8% variances for CPUE. The spatial variables（longitude and latitude） and environmental variables（SST, SSH and Chl a） were significant. The CPUE had nonlinear relationship with SST and SSH but a linear relationship with Chl a. The NNM was found to be effective and robust in the projection with low mean square errors（MSE） and average relative variances（ARV）.The integrated approach can predict the spatial distribution and explain the migration pattern of Illex argentinus in the Southwest Atlantic Ocean.

关键词： Illex argentinus abundance index remote sensing environmental data Southwest Atlantic Ocean

Measurement Method of Compressibility and Thermal Expansion Coefficients for Density Standard Liquid at 2329 kg/m^3 based on Hydrostatic Suspension Principle

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Chinese Journal of Mechanical Engineering 2014年第4期27卷 779-784页

作者： wang jintao LIU Ziyong XU Changhong LI Zhanhong Division of Mechanics and Acoustics National Institute of Metrology

The accurate measurement on the compressibility and thermal expansion coefficients of density standard liquid at 2329kg/m3（DSL-2329） plays an important role in the quality control for silicon single crystal manufacturing. A new method is developed based on hydrostatic suspension principle in order to determine the two coefficients with high measurement accuracy. Two silicon single crystal samples with known density are immersed into a sealed vessel full of DSL-2329. The density of liquid is adjusted with varying liquid temperature and static pressure, so that the hydrostatic suspension of two silicon single crystal samples is achieved. The compression and thermal expansion coefficients are then calculated by using the data of temperature and static pressure at the suspension state. One silicon single crystal sample can be suspended at different state, as long as the liquid temperature and static pressure function linearly according to a certain mathematical relationship. A hydrostatic suspension experimental system is devised with the maximal temperature control error ±50 μK; Silicon single crystal samples can be suspended by adapting the pressure following the PID method. By using the method based on hydrostatic suspension principle, the two key coefficients can be measured at the same time, and measurement precision can be improved due to avoiding the influence of liquid surface tension. This method was further validated experimentally, where the mixture of 1, 2, 3-tribromopropane and 1,2-dibromoethane is used as DSL-2329. The compressibility and thermal expansion coefficients were measured, as 8.5′10–4 K–1 and 5.4′10–10 Pa–1, respectively.

关键词： silicon single crystal sample hydrostatic suspension density standard liquid at 2329 kg/m~3 compressibility coefficient thermal expansion coefficient measurement

Macro/meso failure behavior of surrounding rock in deep roadway and its control technology

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International Journal of Coal Science & Technology 2019年第3期6卷 301-319页

作者： Jianping Zuo jintao wang Yunqian Jiang School of Mechanics and Civil Engineering China University of Mining and Technology Beijing 100083 China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology Beijing 100083 China

Engineering disasters occur frequently and violently with the increase in mining depth, which is mostly due to insufficient study on the failure mechanism of the deep rock mass. In this paper, theoretical and experimental researches on the failure behaviors and deformation control of deep surrounding rock in recent years were reviewed. Macro/meso failure mechanism of deep rock or coal-rock combined body under different loading conditions have been systematically investigated. Stress gradient failure theory of surrounding rock, uniform strength support in the deep roadway, and the analogous hyperbola movement model of overlying strata were preliminary established and a combined grouting control technology for surface and underground was proposed. Abovementioned achievements are expected to offer theoretical bases and technical supports for the exploitation of China's deep mineral resources in the future.

关键词： Failure mechanics Deep mining Control of surrounding rock Failure mechanism

End-to-end Delay Analysis for Mixed-criticality WirelessHART Networks

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IEEE/CAA Journal of Automatica Sinica 2015年第3期2卷 282-289页

作者： Xi Jin jintao wang Peng Zeng the Laboratory of Networked Control Systems Shenyang Institute of AutomationChinese Academy of Science University of Chinese Academy of Sciences Shenyang Institute of Automation Chinese Academy of Science

WirelessHART, as a robust and reliable wireless protocol, has been widely-used in industrial wireless sensoractuator networks. Its real-time performance has been extensively studied, but limited to the single criticality case. Many advanced applications have mixed-criticality communications, where different data flows come with different levels of importance or criticality. Hence, in this paper, we study the real-time mixedcriticality communication using WirelessHART protocol, and propose an end-to-end delay analysis approach based on fixed priority scheduling. To the best of our knowledge, this is the first work that introduces the concept of mixed-criticality into wireless sensor-actuator networks. Evaluation results show the effectiveness and efficacy of our approach. © 2014 Chinese Association of Automation.

关键词： Criticality (nuclear fission)