期刊
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
卷 20, 期 12, 页码 7743-7757出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TWC.2021.3087354
关键词
Location awareness; Wireless communication; Optimization; Protocols; Wireless sensor networks; PIN photodiodes; Indoor localization; reconfigurable intelligent surface; received signal strength
资金
- National Natural Science Foundation of China [61625101, 61931019, 61941101, 62032003]
- NSF [EARS-1839818, CNS1717454, CNS-1731424, CNS-1702850]
This paper proposes using RIS for RSS-based multi-user localization and optimizing phase shifts to improve localization accuracy through PSO algorithm. The effectiveness of the proposed technique is validated through simulation experiments.
The received signal strength (RSS) based technique is extensively utilized for localization in the indoor environments. Since the RSS values of neighboring locations may be similar, the localization accuracy of the RSS based technique is limited. To tackle this problem, in this paper, we propose to utilize reconfigurable intelligent surface (RIS) for the RSS based multi-user localization. As the RIS is able to customize the radio channels by adjusting the phase shifts of the signals reflected at the surface, the localization accuracy in the RIS aided scheme can be improved by choosing the proper phase shifts with significant differences of RSS values among adjacent locations. However, it is challenging to select the optimal phase shifts because the decision function for location estimation and the phase shifts are coupled. To tackle this challenge, we formulate the optimization problem for the RIS-aided localization, derive the optimal decision function, and design the phase shift optimization (PSO) algorithm to solve the formulated problem efficiently. Analysis of the proposed RIS aided technique is provided, and the effectiveness is validated through simulation.
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