Xia, Wenchao;
Zhao, Ben;
Tang, Wankai;
Zhu, Yongxu;
Wong, Kai-Kit;
Lambotharan, Sangarapillai;
Shin, Hyundong;
(2025)
RIS-Empowered Integrated Location Sensing and Communication with Superimposed Pilots.
IEEE Transactions on Communications
10.1109/TCOMM.2025.3557994.
(In press).
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Abstract
In addition to enhancing wireless communication coverage quality, reconfigurable intelligent surface (RIS) technique can also assist in positioning. In this work, we consider RIS-assisted superimposed pilot and data transmission without the assumption availability of prior channel state information and position information of mobile user equipments (UEs). To tackle this challenge, we design a frame structure of transmission protocol composed of several location coherence intervals, each with pure-pilot and data-pilot transmission durations. The former is used to estimate UE locations, while the latter is time-slotted, duration of which does not exceed the channel coherence time, where the data and pilot signals are transmitted simultaneously. We conduct the Fisher Information matrix (FIM) analysis and derive Cram´er-Rao bound (CRB) for the position estimation error. The inverse fast Fourier transform (IFFT) is adopted to obtain the estimation results of UE positions, which are then exploited for channel estimation. Furthermore, we derive the closed-form lower bound of the ergodic achievable rate of superimposed pilot (SP) transmission, which is used to optimize the phase profile of the RIS to maximize the achievable sum rate using the genetic algorithm. Finally, numerical results validate the accuracy of the UE position estimation using the IFFT algorithm and the superiority of the proposed SP scheme by comparison with the regular pilot scheme.
| Type: | Article |
|---|---|
| Title: | RIS-Empowered Integrated Location Sensing and Communication with Superimposed Pilots |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/TCOMM.2025.3557994 |
| Publisher version: | https://doi.org/10.1109/TCOMM.2025.3557994 |
| Language: | English |
| Additional information: | This version is the author-accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Channel estimation, Coherence, Sensors, Vectors, Reconfigurable intelligent surfaces, Protocols, Location awareness, Uplink, Accuracy, Lower bound |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10207373 |
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