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beam alignment for millimeter wave multiuser MIMO systems using sparse-graph codes

Science China(Information Sciences) 2022年第5期65卷 283-284页

作者： Long CHENG Guangrong YUE Pei XIAO Ning WEI Shaoqian LI National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of China 5GIC&6GIC Institute for Communication Systems(ICS) University of Surrey ZTE Corporation State Key Laboratory of Mobile Network and Mobile Multimedia Technology

Dear editor,To achieve millimeter wave (mmWave) beam alignment, a class of beam scanning and searching schemes have been extensively studied [1–3]. Recently, to address the problems of high sample complexity in tradi... 详细信息

关键词： sparse-graph codes mmWave communications compressed sensing LDPC beam alignment

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Piecewise Linear Weighted Iterative Algorithm for beam alignment in Scanning beam Interference Lithography

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Photonic Sensors 2019年第4期9卷 344-355页

作者： Ying SONG Bayanheshig Shuo LI Shan JIANG Wei WANG National Engineering Research Centre for Diffraction Gratings Manufacturing and Application Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesJilin 130033China

To obtain a good interference fringe contrast and high fidelity,an automated beam iterative alignment is achieved in scanning beam interference lithography(SBIL).To solve the problem of alignment failure caused by a large beam angle(or position)overshoot exceeding the detector range while also speeding up the convergence,a weighted iterative algorithm using a weight parameter that is changed linearly piecewise is *** changes in the beam angle and position deviation during the alignment process based on different iterative algorithms are compared by experiment and *** results show that the proposed iterative algorithm can be used to suppress the beam angle(or position)overshoot,avoiding alignment failure caused by *** addition,the convergence speed can be effectively *** algorithm proposed can optimize the beam alignment process in SBIL.

关键词： Piecewise linear weighted iterative algorithm beam alignment scanning beam interference lithography(SBIL) overshoot suppression convergence speed

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beam alignments based on the spectrum decomposition of orbital angular momentums for acoustic-vortex communications

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Chinese Physics B 2022年第12期31卷 296-304页

作者： Gepu Guo Xinjia Li Qingdong Wang Yuzhi Li Qingyu Ma Juan Tu Dong Zhang School of Computer and Electronic Information Nanjing Normal UniversityNanjing 210023China Haiying Enterprise Group Co. Ltd.Wuxi 214061China College of Ocean Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Institute of Acoustics Nanjing UniversityNanjing 210093China

Given the enhanced channel capacity of wave chirality,acoustic communications based on the orbital angular momentum(OAM)of acoustic-vortex(AV)beams are of significant interest for underwater data ***,the stringent beam alignment is required for the coaxial arrangement of transceiver arrays to ensure the accuracy and reliability of OAM *** avoid the required multiple measurements of the traditional orthogonality based algorithm,the beam alignment algorithm based on the OAM spectrum decomposition is proposed for AV communications by using simplified *** studies of the single-OAM and OAM-multiplexed AV beams show that the error of the OAM spectrum increases with the translation distance and the deflection angle of the transceiver *** achieve an ideal arrangement,two methods of the single-array translation alignment and the dual-array deflection alignment are developed based on the least standard deviation of the OAM spectrum(SD-OAM).By decreasing the SD-OAM towards zero using transceiver arrays of 16 transmitters and 16 receivers,accurate beam alignments are accomplished by multiple adjustments in three *** proposed method is also demonstrated by experimental measurements of the OAM dispersion and the SD-OAM for misaligned *** results demonstrate the feasibility of the rapid beam alignment based on the OAM spectrum decomposition by using simplified transceiver ring-arrays,and suggest more application potentials for acoustic communications.

关键词： acoustic-vortex beam beam alignment orbital angular momentum(OAM)spectrum least standard deviation acoustic communication

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