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AI summary · arXiv: 2212.00241v1 · eess.SP

Integrated Communication and Positioning Design in RIS-empowered OFDM System: a Correlation Dispersion Scheme

Xichao Sang, Lin Gui, Kai Ying, Xiaohao Mo, Xiaqing Diao, Shiyong Sun
Original paper Submitted to arXiv on 01 Dec. 2022 31 pages License: NONEXCLUSIVE-DISTRIB 1.0

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  • Authors present a cutting-edge approach to communication and positioning in indoor environments using OFDM systems enhanced by RIS
  • Leveraging CFROPs from specific locations for real-time mapping alongside an offline CFROP database
  • Optimization of RIS phase coefficients to differentiate CFROP databases and enhance accuracy
  • Formulation of optimization problem to maximize virtual distance between CFROPs while addressing challenges posed by imperfect channel state information
  • Introduction of correlation dispersion concept to eliminate spatial consistency issues in positioning methods
  • Clear physical interpretations and enhanced system performance, especially in high-noise environments, through correlation dispersion
  • Greater efficacy of proposed design when prior knowledge of user locations is available
  • Validation and effectiveness of the proposed design demonstrated through numerical results presented in the study

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AI-generated keywords: Integrated Communication

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In their paper titled "Integrated Communication and Positioning Design in RIS-empowered OFDM System: a Correlation Dispersion Scheme," authors Xichao Sang, Lin Gui, Kai Ying, Xiaohao Mo, Xiaqing Diao, and Shiyong Sun present a cutting-edge approach to communication and positioning in indoor environments using orthogonal frequency division multiplexing (OFDM) systems enhanced by reconfigurable intelligent surfaces (RIS). The key innovation lies in leveraging channel frequency responses on pilots (CFROPs) from specific locations of interest for real-time mapping alongside an offline CFROP database. By optimizing the phase coefficients of the RIS, the authors effectively differentiate CFROP databases to minimize similarity and enhance accuracy. Acknowledging the challenges posed by imperfect channel state information due to time-varying factors during two-stage mapping processes, the authors formulate a comprehensive optimization problem aimed at maximizing either the average or minimum virtual distance between CFROPs. They integrate communication service requirements as constraints within this framework while also addressing computational complexity through a moderate case analysis that minimizes accuracy loss. A significant contribution of this work is the introduction of a novel concept termed correlation dispersion, which effectively eliminates spatial consistency issues inherent in traditional positioning methods. This property complements the moderate case scenario by providing clear physical interpretations and enhancing overall system performance, particularly in high-noise environments. Furthermore, when prior knowledge of user locations is available, the proposed design exhibits even greater efficacy. The validity and effectiveness of the proposed integrated communication and positioning design are substantiated through numerical results presented in the study. Overall, this research offers a sophisticated solution that not only addresses existing challenges but also sets a new standard for indoor communication and positioning systems empowered by RIS technology.
Created on 09 Jul. 2024

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