Abstract
In this chapter, sensing-assisted beamforming in the RIS-enabled ISAC system is studied. In Sect. 5.1, the introduction is first provided. In Sect. 5.2, we study sensing-assisted beamforming in the single-user case and then extend it to the multi-user case in Sect. 5.3. Finally, Sect. 5.4 summarizes this chapter.
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Notes
- 1.
For mmWave signals, channel measurement campaigns reveal that signal power of the LoS component is about 13 dB higher than the sum of power of non-line-of-sight (NLoS) components.
- 2.
Although there are some works [4, 5] that considered LoS scenarios and conducted the sensing task at the BS, they can not be applied directly in the considered blind-zone case, where the direct link from the user to the BS is blocked. Hence, we introduce the semi-passive sub-RISs as anchors (positioning reference points), at which the localization task are performed.
- 3.
During the i-th (\(i>1\)) transmission period, the users’ locations estimated in the (\(i-1\))-th transmission period would be used to design the phase shift of the passive sub-RIS in the first time block of the ISAC period.
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Hu, X., Liu, C., Peng, M., Zhong, C. (2024). Sensing-Assisted Beamforming in RIS-Enabled ISAC. In: Reconfigurable Intelligent Surface-Enabled Integrated Sensing and Communication in 6G. Wireless Networks. Springer, Singapore. https://doi.org/10.1007/978-981-99-8299-8_5
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