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Inter-Operator Interference Coordination for CoPrimary Spectrum Sharing in UDN

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China Communications 2015年第S1期12卷 104-112页

作者： YU Qiaoling WANG Jiang YANG Xiumei ZHU Yuanping TENG Yong Horneman Kari Shanghai Research Center for Wireless Communications Shanghai Institute of Microsystem and Information Technology (simit) Chinese Academy of Sciences (CAS) Nokia

Co-primary spectrum sharing for multiple operators has been utilized to fully explore the spectrum resources and thus improve the spectrum efficiency. The inter-operator interference(IOI) problem should be seriously considered in order to achieve the mentioned target, especially under the scenario of the ultradense network(UDN) in the fifth generation(5G) wireless systems. To solve this problem, we propose an asymmetrical power levels based soft IOI coordination mechanism. The shared spectrum pool is consisted of three separated parts, where each part can be dynamically adjusted according to the minimal spectrum demand from each operator. Furthermore, different power masks are configured to different parts for each operator. The simulation results show that the proposed mechanism can improve the network spectrum efficiency significantly.

关键词： ultra-dense network inter-operator interference coordination co-primary spectrum sharing

Multichannel fetal magnetocardiography using SQUID bootstrap circuit

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Chinese Physics B 2013年第12期22卷 514-516页

作者：张树林张国峰王永良刘明李华邱阳曾佳孔祥燕谢晓明 State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and InformationTechnology (SIMIT) Chinese Academy of Sciences (CAS) Joint Research Laboratory on Superconductivity and Bioelectronics Collaboration Between CAS-Shanghai and FZJ State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology(SIMIT) Chinese Academy of Sciences (CAS) State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology (SIMIT) Chinese Academy of Sciences (CAS) University of the Chinese Academy of Sciences Joint Research Laboratory on Superconductivity and Bioelectronics Collaboration Between CAS–Shanghai and FZJ

Fetal magnetocardiography （MCG） is a sophisticated non-invasive technique for the fetal heart diagnosis. We constructed a multichannel fetal MCG system based on a novel superconducting quantum interference device （SQUID） direct readout scheme called SQUID bootstrap circuit （SBC）. The system incorporates four SBC gradiometers for the signal detection and three SBC magnetometers as the references. The fetal MCG signal at a 28-weeks’ gestation was measured. By the fetal MCG signal separation and average, the P-wave and QRS complex can be clearly identified. These results indicate that the SBC is one of the most promising techniques for the fetal MCG recordings.

关键词： SQUID gradiometer fetal magnetocardiography

High-quality industrial n-type silicon wafers with an efficiency of over 23% for Si heterojunction solar cells

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Frontiers in Energy 2017年第1期11卷 78-84页

作者： Fanying MENG Jinning LIU Leilei SHEN Jianhua SHI Anjun HAN Liping ZHANG Yucheng LIU Jian YU Junkai ZHANG Rui ZHOU Zhengxin LIU Research Center for New Energy Technology Shanghai Institute of Microsystem and Information Technology (SIMIT) Shanghai 200050 China Xi'an Longi Silicon Materials Corp. Xi'an 710100 China

n-type CZ-Si wafers featuring longer minority carrier lifetime and higher tolerance of certain metal contamination can offer one of the best Si-based solar cells. In this study, Si heterojuction （SHJ） solar cells which was fabricated with different wafers in the top, middle and tail positions of the ingot, exhibited a stable high efficiency of〉 22% in spite of the various profiles of the resistivity and lifetime, which demonstrated the high material utilization of n-type ingot. In addition, for effectively converting the sunlight into electrical power, the pyramid size, pyramid density and roughness of surface of the Cz-Si wafer were investigated by scanning electron microscope （SEM） and transmission electron microscope （TEM）. Furthermore, the dependence of SHJ solar cell open- circuit voltage on the surface topography was discussed, which indicated that the uniformity of surface pyramid helps to improve the open-circuit voltage and conversion efficiency. Moreover, the simulation revealed that the highest efficiency of the SHJ solar cell could be achieved by the wafer with a thickness of 100 μm. Fortunately, over 23% of the conversion efficiency of the SHJ solar cell with a wafer thickness of 100 μm was obtained based on the systematic optimization of cell fabrication process in the pilot production line. Evidently, the large availability of both n-type ingot and thinner wafer strongly supported the lower cost fabrication of high efficiency SHJ solar cell.

关键词： n-type Cz-Si thinner wafer surface texture,high efficiency SHJ solar cell

Single photon response of superconducting nanowire single photon detector

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Chinese Science Bulletin 2010年第4期55卷 441-445页

作者： YOU LiXing SHEN XiaoFang YANG XiaoYan State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology (SIMIT) Chinese Academy of Sciences Shanghai 200050 China

Single photon detection is one of the key technologies for quantum key distribution in quantum communication. As a novel single photon detection technology, superconducting nanowire single photon detector (SNSPD) surpasses conventional semiconducting single photon detectors with high count rate and low dark count rate. In this article, we introduce SNSPD fabricated from NbN ultrathin superconducting film and lab-based SNSPD system. The characteristics of single photon response pulse of SNSPD are analyzed in detail. Also discussed is the relationship between waveform of single photon response and system bandwidth. Circuit model is made to analyze the performance of SNSPD. The simulation result agrees well with the experimental data. Those results are valuable for understanding the mechanism of SNSPD and building future SNSPD system for quantum communication.

关键词：单光子探测器超导薄膜纳米线反应量子通信高计数率 PD系统密钥分配

A synthetic optically pumped gradiometer for magnetocardiography measurements

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Chinese Physics B 2020年第4期29卷 215-217页

作者： Shu-Lin Zhang Ning Cao Joint Laboratory of Bioimaging Technology and Applications CAS-SIMIT&MEDIShanghai 201899China State Key Laboratory of Functional Materials for Informatics Institute of Microsystem and Information Technology(SIMIT)Chinese Academy of Sciences(CAS)Shanghai 200050China Centre for Excellence in Superconducting Electronics Chinese Academy of SciencesShanghai 200050China Shanghai Medi Instruments Ltd. Shanghai 201899China

Magnetocardiography(MCG)measurement is important for investigating the cardiac biological ***,the extremely weak MCG signal was detected by using superconducting quantum interference devices(SQUIDs).As a room-temperature magnetic-field sensor,optically pumped magnetometer(OPM)has shown to have comparable sensitivity to that of SQUIDs,which is very suitable for biomagnetic *** this paper,a synthetic gradiometer was constructed by using two OPMs under spin-exchange relaxation-free(SERF)conditions within a moderate magnetically shielded room(MSR).The magnetic noise of the OPM was measured to less than 70 fT/Hz1/*** a baseline of 100 mm,noise cancellation of about 30 dB was *** was successfully measured with a signal to noise ratio(SNR)of about 37 *** synthetic gradiometer technique was very effective to suppress the residual environmental fields,demonstrating the OPM gradiometer technique for highly cost-effective biomagnetic measurements.

关键词： optically pumped magnetometer(OPM) magnetocardiography(MCG) gradiometer

An efficient calibration method for SQUID measurement system using three orthogonal Helmholtz coils

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Chinese Physics B 2016年第6期25卷 585-588页

作者：李华张树林张朝祥孔祥燕谢晓明 State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology (SIMIT) Chinese Academy of Sciences (CAS) Shanghai 200050 China University of Chinese Academy of Sciences Beijing 100049 China

For a practical superconducting quantum interference device（SQUID） based measurement system,the Tesla/volt coefficient must be accurately *** this paper,we propose a highly efficient method of calibrating a SQUID magnetometer system using three orthogonal Helmholtz *** Tesla/volt coefficient is regarded as the magnitude of a vector pointing to the normal direction of the pickup *** applying magnetic fields through a three-dimensional Helmholtz coil,the Tesla/volt coefficient can be directly calculated from magnetometer responses to the three orthogonally applied magnetic *** with alternating current（AC） field is normally used for better signal-to-noise ratio in noisy urban environments and the results are compared with the direct current（DC） calibration to avoid possible effects due to eddy *** our experiment,a calibration relative error of about 6.89 × 10-4is obtained,and the error is mainly caused by the non-orthogonality of three axes of the Helmholtz *** method does not need precise alignment of the magnetometer inside the Helmholtz *** can be used for the multichannel magnetometer system calibration effectively and accurately.

关键词： SQUID magnetometer Tesla/volt coefficient calibration three-dimensional Helmholtz coil

Golden Ratio-Based and Tapered Diptera Inspired Wings： Their Design and Fabrication Using Standard MEMS Technology

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Journal of Bionic Engineering 2011年第2期8卷 174-180页

作者： X. Q. Bao IEMN CNRS UMR 8520 F-59650 Villeneuve d Ascq France UVHC IEMN F-59313 Valenciennes France simit Chinese Academy of Sciences Shanghai 200050 P. R. China

This work presents our understanding of insect wings, and the design and micromachining of artificial wings with golden ratio-based and tapered veins. The geometric anisotwpy of Leading Edge Veins （LEVs） selected by Diptera has a function able to evade impact. As a Diptera example, the elliptic hollow-LEVs of cranefly wings are mechanically and aerodynamically significant. In this paper, an artificial wing was designed to be a fractal structure by mimicking cranefly wings and incorporating cross-veins and discal cell. Standard technologies of Microelectromechanical Systems （MEMS） were employed to materialize the design using the selected material. One SU-8 wing sample, light and stiffenough to be comparable to fresh cranefly wings, was presented. The as-prepared SU-8 wings are faithful to real wings not only in weight and vein pattern, but also in flexural stiffness and mass distribution. Thus our method renders possible mimickine with good lidelity of natural wings with complex geometry and morphology.

关键词： insect inspired wing SU-8 MEMS flcxural stiffness Diptera

Fabrication and Characterization of NEMS

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Optoelectronics Letters 2007年第2期3卷 91-94页

作者： JIAO Ji-wei YANG Heng LI Tie LI Xin-xin WANG Yue-lin State Key Laboratory of Transducer Technology Shanghai Institute of Microsystem and Information Technology（SIMIT） Chinese Academy of Sciences Shanghai 200050 China

We proposed a called“nano-fabrication based on MEMS technology”approach to realize the typical nano-electro- mechanical structures,such as integrated nano probe,ultrathin cantilever,silicon nano wire,and doubly clamped nano beam, to demonstrate the feasibility and *** also introduced the characterization of nano structures based on laser vibrometer and piezoresistive effect,the latter method was first time applied to investigate a doubly daped nanobeam with a thickness of about 200 nm.

关键词： NEMS 纳米级机电结构制造特征 MEMS技术

GPP Based Open Cellular Network Towards 5G

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China Communications 2017年第6期14卷 189-198页

作者： Jiang Wang Jing Xu Yang Yang Haidong Xu Key Lab of Wireless Sensor Network and Communication Shanghai 201899 China Shanghai Research Center for Wireless Communications Shanghai 201210 China simit Chinese Academy of Sciences Shanghai 200050 China

Due to 5G's stringent and uncertainty traffic requirements,open ecosystem would be one inevitable way to develop *** the other hand,GPP based mobile communication becomes appealing recently attributed to its striking advantage in flexibility and *** this paper,both the advantages and challenges of GPP platform are detailed ***,both GPP based software and hardware architectures for open 5G are presented and the performances of real-time signal processing and power consumption are also *** evaluation results indicate that turbo and power consumption may be another challengeable problem should be further solved to meet the requirements of realistic deployments.

关键词： open 5G general purpose processor (GPP) real-time signal processing software defined network (SDN) network function virtualization (NFV)