{"ID":2889193,"CreatedAt":"2026-06-01T04:54:23.091178241Z","UpdatedAt":"2026-06-01T04:54:23.091178241Z","DeletedAt":null,"paper_url":"https://arxiv.org/abs/2507.21785","arxiv_id":"2507.21785","title":"Pilot-to-Data Power Ratio in RIS-Assisted Multiantenna Communication","abstract":"The optimization of the \\gls{pdpr} is a recourse that helps wireless systems to acquire channel state information while minimizing the pilot overhead. While the optimization of the \\gls{pdpr} in cellular networks has been studied extensively, the effect of the \\gls{pdpr} in \\gls{ris}-assisted networks has hardly been examined. This paper tackles this optimization when the communication is assisted by a RIS whose phase shifts are adjusted on the basis of the statistics of the channels. For a setting representative of a macrocellular deployment, the benefits of optimizing the PDPR are seen to be significant over a broad range of operating conditions. These benefits, demonstrated through the ergodic minimum mean squared error, for which a closed-form solution is derived, become more pronounced as the number of RIS elements and/or the channel coherence grow large.","short_abstract":"The optimization of the \\gls{pdpr} is a recourse that helps wireless systems to acquire channel state information while minimizing the pilot overhead. While the optimization of the \\gls{pdpr} in cellular networks has been studied extensively, the effect of the \\gls{pdpr} in \\gls{ris}-assisted networks has hardly been e...","url_abs":"https://arxiv.org/abs/2507.21785","url_pdf":"https://arxiv.org/pdf/2507.21785v1","authors":"[\"Masoud Sadeghian\",\"Angel Lozano\",\"Gabor Fodor\"]","published":"2025-07-29T13:12:44Z","proceeding":"cs.IT","tasks":"[\"cs.IT\",\"eess.SP\"]","methods":"[]","has_code":false}