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| 1 | Transmit Diversity Scheme Design for Rectangular Pulse Shaping Based OTFS显示文摘This paper investigates the transmission scheme of the orthogonal time frequency space(OTFS)system with multiple antennas.Previous works have studied the multi-antenna transmitter diversity scheme with the ideal pulse shaping in OTFS systems assuming the wireless channels of two consecutive frames duration are invariant.However,the ideal pulse shaping can not be realized in practice and the channel varies rapidly in two consecutive frames in the high-speed mobility scenarios.To this end,we redesign the multi-antenna transmitter diversity scheme to ensure its practicability in the rectangular-pulsebased OTFS systems.At first,the information symbols of each antenna are divided into two half frames along the Doppler domain.Then,the guard symbols are carefully arranged to eliminate the interference between two half frames,and to ensure the equivalent channels of two half frames being identical.By considering the positions of the guard symbols,the transmission codeword is designed and a low complexity linear detection is proposed.Finally,simulation results validate that the bit error rate performance of the proposed scheme has the superiority over the existing works. | Dong Wang Bule Sun Fanggang Wang Xiran Li Pu Yuan Dajie Jiang | 2022 | China Communications2022，19，3： | 0 |
| 2 | Reasons to seek orthodontic treatment affecting patients' satisfaction显示文摘Objective To assess patients' satisfaction level with orthodontic treatment and to identify it there was any association between patient's reason to seek orthodontic treatment and their satisfaction level with the treatment outcome.Methods This study was conducted among a sample of 80 patients.A questionnaire was formulated including Dental Impact on Daily Living questionnaire(to assess the effect of the treatment on daily living and satisfaction with the dentition).Descriptive statistics,Chi-square test were used to analyze the data.Results and Conclusion Patients' reason to seek orthodontic treatment had no significant association with patients' satisfaction with their dentition after orthodontic treatment.Patients with aesthetic need were found to experience more pain(P=0.034).There was statistical significant association between age and total satisfaction(P=0.035).Gender had no effect on patient's satisfaction. | Vongphachanh Xayasone XU Huiyong LI Yinghui SUN Fengyang LU Zhiyun TIAN Hua ZOU Yaguang TAN Xiaoting LI Tinghui WU Buling | 2017 | 分子影像学杂志2017，40，2： | 0 |
| 3 | AI Enlightens Wireless Communication: Analyses and Solutions for DMRS Channel Estimation显示文摘In this paper,a systematic description of the artificial intelligence(AI)-based channel estimation track of the 2nd Wireless Communication AI Competition(WAIC)is provided,which is hosted by IMT-2020(5G)Promotion Group 5G+AIWork Group.Firstly,the system model of demodulation reference signal(DMRS)based channel estimation problem and its corresponding dataset are introduced.Then the potential approaches for enhancing the performance of AI based channel estimation are discussed from the viewpoints of data analysis,pre-processing,key components and backbone network structures.At last,the final competition results composed of different solutions are concluded.It is expected that the AI-based channel estimation track of the 2nd WAIC could provide insightful guidance for both the academia and industry. | Bule Sun Zhiqin Wang Ang Yang Xiaofeng Liu Shi Jin Peng Sun Rakesh Tamrakar Dajie Jiang | 2023 | China Communications2023，20，5： | 0 |
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