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A new SSVEP-based BCI utilizing frequency and space to encode visual targets

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Science China(Information Sciences) 2020年第8期63卷 257-259页

作者： Min ZHANG Zhenyu WANG honglin hu Shanghai Advanced Research Institute Chinese Academy of Sciences University of Chinese Academy of Sciences School of Information Science and Technology ShanghaiT ech University

Dear editor,Brain-computer interfaces (BCIs) based on steadystate visual evoked potential (SSVEP) have attracted considerable attention from researchers owing to their improved performance, such as their higher recognition accuracy, more reliable relation to stimuli, and higher information transfer rate(ITR), compared with other types of BCIs.A major challenge for SSVEP-based BCIs is the

关键词： Brain-computer interface SSVEP EEG Quadratic Discriminant Analysis Information transfer rate

A delay-constrained energy-efficient component carrier adjusting scheme for LTE-Advanced systems

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High Technology Letters 2014年第3期20卷 237-244页

作者：陈华夏 hu honglin Key Laboratory of Wireless Sensor Network & Communication Shanghai Institute of Microsystem and Information Technology(SIMIT)Chinese Academy of Sciences(CAS) University of Chinese Academy of Sciences Shanghai Research Center for Wireless Communications(WiCO)

The energy efficiency and packet delay tradeoffs in long term evolution-advanced(LTE-A) systems are *** expressions are derived to explain the relation of energy efficiency to mean packet delay,arrival rate and component carrier(CC) configurations,from the theoretical respective which reveals that the energy efficiency of multiple CC systems is closely related to the frequency of CCs and the number of active *** on the theoretical analysis,a CC adjusting scheme for LTE-A systems is proposed to maximize energy efficiency subject to delay constraint by dynamically altering the on/off state of CCs according to traffic *** and simulation results show that for CCs in different frequency bands with equal transmit power,the proposed scheme could significantly improve the energy efficiency of users in all aggregation levels within the constraint of mean packet delay.

关键词： energy efficiency carrier aggregation (CA) delay constraint component carrier(CC) scheduling long term evolution-advanced systems

Transmit correlation effect on SIC-ZF receiver for V-BLAST system

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Science in China(Series F) 2009年第12期52卷 2290-2295页

作者： GUO HaiYou ZHOU ZhiGang hu honglin Key Laboratory of Wireless Sensor Network & Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China Shanghai Research Center for Wireless Communications Shanghai 200335 China

It has been shown that transmit correlation causes a signal-to-noise ratio （SNR） loss in the zero forcing （ZF） receiver for V-BLAST （Vertical Bell LAbs LAyered Space-Time） system. In this paper, we investigate the transmit correlation effect on the ZF receiver with successive interference cancellation （SIC）. We show that such an unfavorable condition leads to twofold effects on the performance degradation. In addition to the immediate SNR loss, the transmit correlation can increase the propagation factor to spread decision error significantly. These two effects are evaluated analytically. We derive the probability density function （pdf） of the effective SNR at each decoded stream, and hence accurately quantify the SNR loss. We also calculate the decision error propagation factor in terms of its second moment. In particular, we show that transmit correlation can cause a stable component of error propagation which does not decline during the SIC procedure. Finally, we conduct the simulation to verify the analytical results.

关键词： error propagation (EP) successive interference cancellation (SIC) transmit correlation V-BLAST zero forcing (ZF)

CYP17A1基因突变致先天性肾上腺皮质增生症一例报道并文献复习

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中国全科医学 2025年第6期28卷 771-776页

作者：戴遥薛丽萍章诗琪许敏章秋胡红琳安徽医科大学第一附属医院内分泌代谢科安徽省合肥市2320000

17α-羟化酶缺乏症(17-OHD)是先天性肾上腺皮质增生症(CAH)中的一种罕见类型,约占CAH的1%,其患病率为1∶50000。本文报道了1例疑似17-OHD患者,通过外显子测序鉴定了1个类固醇生成酶基因CYP17A1的基因突变,结合临床表现、体格检查、肾上... 详细信息

17α-羟化酶缺乏症(17-OHD)是先天性肾上腺皮质增生症(CAH)中的一种罕见类型,约占CAH的1%,其患病率为1∶50000。本文报道了1例疑似17-OHD患者,通过外显子测序鉴定了1个类固醇生成酶基因CYP17A1的基因突变,结合临床表现、体格检查、肾上腺和性腺功能检查等,最终将其明确诊断为CAH并给予规范治疗。故结合该病例,本文回顾总结了17-OHD的鉴别和诊断,以期提高临床对该病的认识,促进临床对17-OHD的规范诊治,为17-OHD的诊断和治疗提供更多的参考资料。

关键词：肾上腺皮质疾病先天性肾上腺皮质增生症 17α-羟化酶缺陷症基因诊断 CYP17A1基因

NOMA-Based Spectrum Sensing for Satellite-Terrestrial Communication

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China Communications 2023年第4期20卷 227-242页

作者： Tianheng Xu Yinjun Xu Ting Zhou Xianfu Chen honglin hu Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China Shanghai Frontier lnnovation Research Institute Shanghai 201100China School of Microelectronics Shanghai UniversityShanghai 200444China VTT Technical Research Centre of Finland 90570 OuluFinland

With the continuous development of wireless communication technology,the number of access devices continues to soar,which poses a grate challenge to the already scarce spectrum ***,6G will be an era of air-space-terrestrial-sea integration,and satellite spectrum resources are also very tight in the context of giant *** this paper,we propose a Non-Orthogonal Multiple Access(NOMA)based spectrum sensing scheme for the future satellite-terrestrial communication scenarios,and design the transceiver from uplink and downlink scenarios,*** order to better identify the user's transmission status,we obtain the feature values of each user through feature detection to make *** combine these two technologies to design the transceiver architecture and deduce the threshold value of feature detection in the satellite-terrestrial communication *** are performed in each scenario,and the results illustrate that the proposed scheme combining NOMA and spectrum sensing can greatly improve the throughput with a similar detection probability as Orthogonal Multiple Access(OMA).

关键词： NOMA spectrum sensing feature detection satellite-terrestrial communication

Fragmental Weight-Conservation Combining Scheme for Statistical Signal Transmissions under Fast Time-Varying Channels

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China Communications 2020年第1期17卷 118-128页

作者： Xingwei Wang Ting Zhou Tianheng Xu Songlin Feng honglin hu Yanliang Jin School of Communication and Information Engineering Shanghai UniversityShanghai 200444China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China

Statistical Signal Transmission(SST)is a technique based on orthogonal frequency-division multiplexing(OFDM)and adopts cyclostationary features,which can transmit extra information without additional ***,the more complicated environment in 5G communication systems,especially the fast time-varying scenarios,will dramatically degrade the performance of the *** this paper,we propose a fragmental weight-conservation combining(FWCC)scheme for SST,to overcome its performance degradation under fast time-varying *** proposed FWCC scheme consists of three phases:1、incise the received OFDM stream into pieces;2、endue different weights for fine and contaminated pieces,respectively;3、combine cyclic autocorrelation function energies of all the pieces;and 4、compute the final feature and demodulate data of *** these procedures above,the detection accuracy of SST will be theoretically refined under fast time-varying *** an inference is confirmed through numerical results in this *** is demonstrated that the BER performance of proposed scheme outperforms that of the original scheme both in ideal channel estimation conditions and in imperfect channel estimation *** addition,we also find the experiential optimal weight distribution strategy for the proposed FWCC scheme,which facilitates practical applications.

关键词： Cyclostationary features statistical signal transmission(SST) weight conservation time-varying channels

Environmental Information-Aided Electromagnetic Propagation Testbed for Maritime Communication

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China Communications 2023年第3期20卷 302-315页

作者： Ting Zhou Yuzhen Wang Bilian Xu Tianheng Xu Xiaoming Tao honglin hu Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of ScienceBeijing 100049China School of Microelectronics Shanghai UniversityShanghai 200444China Department of Electronic Engineering Tsinghua UniversityBeijing 100084China

Maritime channel modeling can be affected by some key time-varying environmental *** ducting effect is one of the thorniest factors since it causes anomalous propagation enhancement and severe co-channel ***,the atmospheric attenuation is much more severe in the ocean environment,resulting in shorter coverage distance and more link *** this paper,we propose an environmental information-aided electromagnetic propagation *** is based on complex refractivity estimation and improved parabolic equation propagation model,taking into account both ducting effect and atmospheric attenuation.A large-scale temporal and spatial propagation measurement was conducted with meteorological *** consider practical path loss and ducting conditions to verify the testbed feasibility in these long-distance radio *** simulation results are in good agreement with the measured data,which further reveal the basic temporal and spatial distribution of ducting effect at 3.5 GHz band.

关键词： broadband maritime communication maritime channel ducting effect electromagnetic propagation testbed propagation measurement atmospheric attenuation path loss

Flexible Uplink MU-MIMO Scheduling in UnlicensedSpectrum

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China Communications 2017年第12期14卷 59-71页

作者： Boqi Jia Ting Zhou honglin hu Yang Yang Zhenhong Li Sandrine Boumard Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai China Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai China Shanghai Research Center for Wireless Communication Shanghai China TCL Communication Technology Holdings Ltd. Shanghai R&D Center Shanghai China VTT Technical Research Centre of Finland Ltd Oulu Finland University of Chinese Academy of Sciences Beijing China

Utilizing the unlicensed spectrum as supplementary is being studied to meet the increasingly growing demand of user equipment for rate,traffic and bandwidth,and thus to mitigate the current spectrum scarcity *** this paper,we investigate the uplink multi-user multiple-input multiple-output(UL MU-MIMO) technique to achieve multiplexing gain in unlicensed *** first define a new parameter called channel busy radio(CBR) which is related to the probability of occupying the unlicensed channel,and find that the failure to occupy the unlicensed channel leads to the performance degradation in unlicensed ***,according to the user-specific CBR of the unlicensed channel,we propose a flexible scheduling scheme for UL MU-MIMO in unlicensed spectrum,and formulate an optimization problem for the optimal scheduled user ***,an adaptive scheduling algorithm is proposed to decide the optimal number of the scheduled users *** simulation results show that,based on statistical channel condition in unlicensed spectrum,adjusting the number of the scheduled user flexibly can offset the degraded throughput and form an optimal MU-MIMO transmission.

关键词： 5G unlicensed spectrum MU-MIMO uplink scheduling

Weight Based Channel Selection Towards 5G in the Unlicensed Spectrum

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China Communications 2018年第8期15卷 54-66页

作者： Yu Zeng Ting Zhou honglin hu Yang Yang Jinfeng Tian Zhenhong Li Shanghai Institute of Microsystem and Information Technology(SIMIT) Chinese Academy of SciencesNo.865 Changning RoadChangning DistrictShanghai 200050China University of Chinese Academy of Sciences No.19A Yuquan RoadShijingshan DistrictBeijing 100049China Shanghai Advanced Research Institute(SARI) Chinese Academy of SciencesNo.99 Haike RoadPudong DistrictShanghai 201210China ShanghaiTech University Shanghai 201210China TCL Communication Technology Holdings Ltd.Shanghai R&D Center Building C5-9FNo.232Liangjing RoadZhangjiang H igh-tech ParkShanghai 201203China

The growth of the wireless and mobile communication data traffic has brought severe challenges to the present telecommu- nication systems. To meet the ever-increasing mobile traffic demand in the next 5th generation （SG） communication systems, deploying 5G in the unlicensed spectrum （SG-U）, has been regarded as a promising technology. The Third Generation Partnership Project （3GPP） has specified the standardization of the Li- censed Assisted Access （LAA） and its extension enhanced LAA （eLAA）, to opportunistically transmit in the unlicensed spectrum. The LAA/eLAA systems share unlicensed spectrum resource with other networks, e.g., the Wi-Fi systems. In this article, we analyze the coexistence between the eLAA and the Wi-Fi systems in the unlicensed spectrum. We firstly establish the system model where the eLAA coexists with the Wi-Fi systems. Then, we theoretically derive and figure out the unfairness in the multi-channel occupancy rate between the eLAA and the Wi-Fi systems. After that, we propose a weight based channel selection method to improve the fairness of the coexistence. The numerical results demonstrate that by avoiding contentions and declining collisions, our method not only enhances the fairness, but also improves the overall unlicensed spectrum usage rate.

关键词： 5G unlicensed spectrum eLAA Wi-Fi multi-channel transmission