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6G环境认知通信与感知课题组-曾勇

Intro block 移动通信全国重点实验室

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通信感知一体化

研究简介

 

第六代(6G)移动通信的 “全覆盖、全频谱、全应用、强安全”发展愿景,将在传统的通信时延和速率要求基础上,引入信息感知能力作为性能指标衡量的新维度。同时,通信感知一体化(Integrated Sensing and Communication,ISAC)的概念正日益受到学术界、工业界和标准化机构的关注,并被ITU-R正式纳入6G的六大使用场景。其核心思想是充分共用基础设施及无线资源在同一个系统内实现通信和感知功能,并充分挖掘二者的融合机理,最终实现通信和感知的深层次互惠增强或高效折中。课题组从通信和感知的覆盖问题出发,研究分析了通信和感知系统在覆盖区域上的不同,进而研究了面向通信感知一体化的波束扫描和码本设计问题,并深入研究了面向通信感知一体化的波形设计以及如何利用现有5G NR波形实现超分辨感知。 

                                             

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研究方向 

 

1. 通信感知一体化无缝覆盖

针对通信和感知在衡量覆盖特性上的差别,在多基站协作通感一体化中提出了一种面向通感无缝覆盖的波束赋形优化设计方案,向热点感知区域提供无缝覆盖的同时,满足通信用户的服务质量,以此来揭示通信感知一体化在覆盖方面的耦合特性。

    

多站协作式通信感知一体化覆盖

 

2. 通信感知一体化码本设计与波束扫描

在通信感知一体化系统中,如何设计码本和波束扫描方法来减少信道训练开销是一个值得研究的实际问题。现有码本和波束大多聚焦于传统通信系统进行设计,面向通信感知一体化系统的相关研究比较有限。本项工作提出了面向通信感知一体化系统的多码本设计和波束扫描方法,能极大提高波束扫描效率。

                                            

                                                              通信感知一体化波束扫描

3. 通信感知一体化波形设计

3.1 以雷达为中心

针对传统基于脉冲式雷达的通信感知一体化波形在频谱效率和感知盲区的局限,提出了面向全双工通信感知一体化(FD-ISAC)的波形设计方案,能在保证其感知性能的同时极大地提高通信频谱效率,并能有效解决传统雷达波形的感知盲区问题。

   

                传统基于脉冲式雷达的ISAC波形                                            所提的FD-ISAC波形

 

3.2 以通信为中心

基于5G NR波形,研究超分辨与感知一体化技术中关键的信号处理技术,完成了原型机搭建,并通过进行链路级的仿真实验以验证所提出方案的有效性与可靠性。并搭建了一个ISSAC实验平台来验证理论分析,可以利用5G NR波形实现高精度的时延和多普勒估计。

                                               基于5G NR波形的通信感知一体化系统

 

3.3 面向通信感知一体化的时延多普勒对齐调制

在复杂多径环境,如何同时实现无码间串扰通信和高性能感知是一个挑战性问题。传统基于OFDM的通信感知一体化设计,面临高PAPR和高速移动场景性能严重受限的问题。针对该问题,研究提出了基于时延(多普勒)对齐调制(DAM/DDAM)的通信感知一体化设计方案,能同时实现无码间串扰和高性能感知。

           面向单站通信感知一体化DAM                                         面向双站通信感知一体化的DDAM

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研究成果

期刊论文:

[1] Z. Xiao and Y. Zeng*, “An overview on integrated localization and communication towards 6G,” Sci. China Inf. Sci., vol. 65, no. 3, pp.1–46, Mar. 2022.

论文链接:https://link.springer.com/article/10.1007/s11432-020-3218-8

[2] Z. Xiao and Y. Zeng*, “Waveform design and performance analysis for full-duplex integrated sensing and communication,” IEEE J. Sel. Areas. Commun., vol. 40, no. 6, pp. 1823–1837, Jun. 2022.

论文链接:https://ieeexplore.ieee.org/abstract/document/9724187

[3] Z. Xiao and Y. Zeng*, “Integrated Sensing and Communication with Delay Alignment Modulation: Performance Analysis and Beamforming Optimization”, IEEE Trans. Wireless Commun., vol. 22, no. 12, pp. 8904-8918, Dec. 2023.

论文链接:https://ieeexplore.ieee.org/abstract/document/10105893

[4] Z. Xiao,S. Chen and Y. Zeng*, “Simultaneous Multi-Beam Sweeping for Mmwave Massive MIMO Integrated Sensing and Communication”, IEEE Trans. Veh. Tech., Early Access, 2024.

论文链接:https://ieeexplore.ieee.org/abstract/document/10382696

[5] R. Li, Z. Xiao, and Y. Zeng*, “Towards Seamless Sensing Coverage for Cellular Multi-Static Integrated Sensing and Communication,” IEEE Transactions on Wireless Communications, Early Access, 2024.

论文链接:https://ieeexplore.ieee.org/abstract/document/10304081

会议论文:

[1] Z. Xiao and Y. Zeng, “Full-Duplex Integrated Sensing and Communication: Waveform Design and Performance Analysis” in Proc. IEEE WCSP 2021, pp. 1-6.

论文链接:https://ieeexplore.ieee.org/abstract/document/9613663

[2] Z. Xiao and Y. Zeng, “Integrated sensing and communication with delay alignment modulation,” in Proc. IEEE ICC, Jun. 2022, pp. 1–6.

论文链接:https://ieeexplore.ieee.org/abstract/document/9839117

[3] S. Chen, Z. Xiao, and Y. Zeng, “Simultaneous Beam Sweeping for Multi-Beam Integrated Sensing and Communication”, in Proc. IEEE ICC 2022, pp. 1-6.

论文链接:https://ieeexplore.ieee.org/abstract/document/9838563

[4] R. Li, Z. Xiao, and Y. Zeng, “Beamforming Towards Seamless Sensing Coverage for Cellular Integrated Sensing and Communication”, in Proc. IEEE ICC Workshop, 2022, pp. 1-6.

论文链接:https://ieeexplore.ieee.org/abstract/document/9814606

[5] Z. Xiao,Y. Zeng,D. W. K. Ng,and F. Wen, “Exploiting Double Timescales for Integrated Sensing and Communication with Delay-Doppler Alignment Modulation”, in Proc. IEEE ICC 2023, pp. 1-6.

论文链接:https://ieeexplore.ieee.org/abstract/document/10279599

[6] C. Zhang, Z. Zhou, H. Wang and Y. Zeng, "Integrated Super-Resolution Sensing and Communication with 5G NR Waveform: Signal Processing with Uneven CPs and Experiments: (Invited Paper)," 2023 21st International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt), Singapore, Singapore, 2023, pp. 681-688.

论文链接:https://ieeexplore.ieee.org/abstract/document/10349843

预印本:

[1] Z. Xiao,  Y. Zeng, F. Wen, Z. Zhang, and D. W. K. Ng, "Integrated Sensing and Channel Estimation by Exploiting Double Timescales for Delay-Doppler Alignment Modulation",  arXiv preprint arXiv:2310.11326, 2023.

论文链接:https://arxiv.org/abs/2310.11326

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Created: Dec 18, 2023 | 16:59