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| 1 | Wireless Communications with Programmable Metasurface:Transceiver Design and Experimental Results显示文摘Metasurfaces have drawn significant attentions due to their superior capability in tailoring electromagnetic waves with a wide frequency range, from microwave to visible light. Recently, programmable metasurfaces have demonstrated the ability of manipulating the amplitude or phase of electromagnetic waves in a programmable manner in real time, which renders them especially appealing in the applications of wireless communications. In this paper, we present the fundamental principle of applying programmable metasurface as transmitter for wireless communications. Then, we establish a prototype system of metasurface-based transmitter to conduct several experiments and measurements over the air, which practically demonstrate the feasibility of using programmable metasurfaces in future communication systems. By exploiting the dynamically controllable property of programmable metasurface, the design, implementation and experimental evaluation of the proposed metasurface-based wireless communication system are presented with the prototype, which realizes single carrier quadrature phase shift keying(QPSK) transmission over the air. In the developed prototype, the phase of the reflected electromagnetic wave of programma-ble metasurface is directly manipulated in real time according to the baseband control signal, which achieves 2.048 Mbps data transfer rate with video streaming transmission over the air. In addition, experimental result is provided to compare the performance of the proposed metasurface-based architecture against the conventional one. With the slight increase of the transmit power by 5 dB, the same bit error rate(BER) performance can be achieved as the conventional system in the absence of channel coding. Such a result is encouraging considering that the metasurface-based system has the advantages of low hardware cost and simple structure, thus leading to a promising new architecture for wireless communications. | Wankai Tang Xiang Li Jun Yan Dai Shi Jin Yong Zeng Qiang Cheng Tie Jun Cui | 2019 | China Communications2019，16，5： | 23 |
| 2 | Accurate and broadband manipulations of harmonic amplitudes and phases to reach 256 QAM millimeter-wave wireless communications by time-domain digital coding metasurface显示文摘We propose a theoretical mechanism and new coding strategy to realize extremely accurate manipulations of nonlinear electromagnetic harmonics in ultrawide frequency band based on a time-domain digital coding metasurface(TDCM).Using the proposed mechanism and coding strategy,we design and fabricate a millimeter-wave(mmWave) TDCM,which is composed of reprogrammable meta-atoms embedded with positive-intrinsic-negative diodes.By controlling the duty ratios and time delays of the digital coding sequences loaded on a TDCM,experimental results show that both amplitudes and phases of different harmonics can be engineered at will simultaneously and precisely in broad frequency band from 22 to33 GHz,even when the coding states are imperfect,which is in good agreement with theoretical calculations.Based on the fabricated high-performance TDCM,we further propose and experimentally realize a large-capacity mmWave wireless communication system,where 256 quadrature amplitude modulation,along with other schemes,is demonstrated.The new wireless communication system has a much simpler architecture than the currently used mmWave wireless systems,and hence can significantly reduce the hardware cost.We believe that the proposed method and system architecture can find vast application in future mmWave and terahertz-wave wireless communication and radar systems. | Ming Zheng Chen Wankai Tang Jun Yan Dai Jun Chen Ke Lei Zhang Cheng Zhang Jin Yang Lianlin Li Qiang Cheng Shi Jin Tie Jun Cui | 2022 | National Science Review2022，9，1： | 13 |
| 3 | DIRECT DIGITAL DESIGN AND SIMULATION OF MESHING IN WORM-GEAR DRIVE显示文摘蠕虫齿轮开车的一个直接数字的设计方法(DDDM ) 被建议。它是直接基于生产的模拟处理并且与常规建模方法完全不同。装载牙齿接触分析(LTCA ) 方法被分析,在哪个出现寻找技术的先进表面被包括。接触地区和传动错误(TE ) 上的 misalignmenterrors 和接触变丑的影响被讨论。蠕虫牙齿表面的 Combinedmodification 途径被介绍。借助于 DDDM 和 LTCA,验证蠕虫齿轮开车的效果是很方便的“ s 修正途径。分析结果显示出那,在侧面方向的修正在纵的方向减少减少蠕虫齿轮开车 tomisalignment 错误和修正的敏感 TE。因此,蠕虫齿轮开车的优化设计能在实际生产过程以前被完成。 | XU Wujiao QIN Datong SHI Wankai | 2006 | Chinese Journal of Mechanical Engineering2006，19，3： | 10 |
| 4 | Space-frequency-polarization-division multiplexed wireless communication system using anisotropic space-time-coding digital metasurface显示文摘In the past few years,wireless communications based on digital coding metasurfaces have gained research interest owing to their simplified architectures and low cost.However,in most of the metasurface-based wireless systems,a single-polarization scenario is used,limiting the channel capacities.To solve the problem,multiplexing methods have been adopted,but the system complexity is inevitably increased.Here,a space-frequency-polarization-division multiplexed wireless communication system is proposed using an anisotropic space-time-coding digital metasurface.By separately designing time-varying control voltage sequences for differently oriented varactor diodes integrated on the metasurface,we achieve frequency-polarization-division multiplexed modulations.By further introducing different time-delay gradients to the control voltage sequences in two polarization directions,we successfully obtain space-frequency-polarization-division multiplexed modulations to realize a wireless communication system with a new architecture.The new communication system is designed with compact dual-polarized meta-elements,and can improve channel capacity and space utilization.Experimental results demonstrate the high-performance and real-time transmission capability of the proposed communication system,confirming its potential application in multiple-user collaborative wireless communications. | Jun Chen Ke Xiangyu Chen Wankai Tang Ming Zheng Chen Lei Zhang Li Wang Jun Yan Dai Jin Yang Jun Wei Zhang Lijie Wu Qiang Cheng Shi Jin Tie Jun Cui | 2022 | National Science Review2022，9，11： | 2 |
| 5 | Analysis of power flow in a counter-rotating epicyclic gearing for electrical propulsion system 显示文摘 | Shi Wankai Li Liangjun Qin Datong | 2011 | Journal of Mechanical Engineering Science2011，225，12： | 1 |
| 6 | A solid modeling and geometric analysis of hourglass worm gearing显示文摘 | Qin Dongxing Qin Datong Shi Wankai | 1998 | Journal of Chongqing University1998，21，4： | 1 |
| 7 | Meshing Control of the Double-enveloping HhourglassWorm Gearing under the Conditions of Existing the Errors and theLoad显示文摘 | Wankai Shi | 2004 | Mechanism and Machine Theory2004，，39： | 1 |
| 8 | Dual-Polarized RIS-Based STBC Transmission with Polarization Coupling Analysis显示文摘The rapid development of the reconfigurable intelligent surface(RIS)technology has given rise to a new paradigm of wireless trans-mitters.At present,most research works on RIS-based transmitters focus on single-polarized RISs.In this paper,we propose a dual-polarized RIS-based transmitter,which realizes 4-transmit space-time block coding(STBC)transmission by properly partitioning RIS’s unit cells and utilizing the degree of freedom of polarization.The proposed scheme is evaluated through a prototype system that utilizes a fabricated dual-polarized phase-adjustable RIS.In particular,the polarization coupling phenomenon in each unit cell of the employed dual-polarized RIS is modeled and analyzed.The experimental results are in good agreement with the theoretical modeling and analysis results,and an initial re-search effort is made on characterizing the polarization coupling property in the dual-polarized RIS. | ZHOU Mingyong CHEN Xiangyu TANG Wankai KE Jun Chen JIN Shi CHENG Qiang CUI Tie Jun | 2022 | ZTE Communications2022，20，1： | 1 |
| 9 | CSI acquisition in RIS-assisted mobile communication systems显示文摘Reconfigurable intelligent surface-(RIS)assisted mobile communication is a promising technological paradigm thanks to the attractive advantages of low cost and flexible control of electromagnetic waves.However,the low-cost features of RISs entail some fundamental challenges to the acquisition of channel state information(CSI),which is essential for the optimal RIS design.To tackle this problem,there have been extensive studies on CSI acquisition in RIS-assisted mobile communication systems,from the perspective of architectural improvement as well as specific mathematical solutions.This article aims to overview the existing works on CSI acquisition in RIS-assisted mobile communication systems. | Yu Han Wankai Tang Xiao Li Michail Matthaiou Shi Jin | 2023 | National Science Review2023，10，8： | 0 |
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