{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,31]],"date-time":"2025-12-31T20:11:20Z","timestamp":1767211880316,"version":"build-2065373602"},"reference-count":65,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2022,1,28]],"date-time":"2022-01-28T00:00:00Z","timestamp":1643328000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Community of Madrid, Spain","award":["CODEUS, ref. CM\/JIN\/2019\u2010043; RACC CM\/JIN\/2021\u2010016"],"award-info":[{"award-number":["CODEUS, ref. CM\/JIN\/2019\u2010043; RACC CM\/JIN\/2021\u2010016"]}]},{"name":"Youth Employment Support Guarantee","award":["PEJ\u20102018\u2010 AI\/TIC\u201011833"],"award-info":[{"award-number":["PEJ\u20102018\u2010 AI\/TIC\u201011833"]}]},{"name":"Spanish Ministry of Science, Innovation and Universities","award":["PoM, PID2019\u2010 105470RA\u2010C33"],"award-info":[{"award-number":["PoM, PID2019\u2010 105470RA\u2010C33"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>This work presents the CODEUS platform, which includes a simulation tool together with an online experimental demonstrator to offer analysis and testing flexibility for researchers and developers in Ultrasonic Indoor Positioning Systems (UIPSs). The simulation platform allows most common encoding techniques and sequences to be tested in a configurable UIPS. It models the signal modulation and processing, the ultrasonic transducers\u2019 response, the beacon distribution, the channel propagation effects, the synchronism, and the application of different positioning algorithms. CODEUS provides results and performance analysis for different metrics and at different stages of the signal processing. The UIPS simulation tool is specified by means of the MATLAB\u00a9 App-Designer environment, which enables the definition of a user-friendly interface. It has also been linked to an online demonstrator that can be managed remotely by means of a website, thus avoiding any hardware requirement or equipment on behalf of researchers. This demonstrator allows the selected transmission schemes, modulation or encoding techniques to be validated in a real UIPS, therefore enabling a fast and easy way of carrying out experimental tests in a laboratory environment, while avoiding the time-consuming tasks related to electronic design and prototyping in the UIPS field. Both simulator and online demonstrator are freely available for researchers and students through the corresponding website.<\/jats:p>","DOI":"10.3390\/s22031038","type":"journal-article","created":{"date-parts":[[2022,1,29]],"date-time":"2022-01-29T01:43:27Z","timestamp":1643420607000},"page":"1038","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Simulation Tool and Online Demonstrator for CDMA-Based Ultrasonic Indoor Localization Systems"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8271-6843","authenticated-orcid":false,"given":"Mar\u00eda Carmen","family":"P\u00e9rez-Rubio","sequence":"first","affiliation":[{"name":"Department of Electronics, University of Alcal\u00e1, 28801 Alcal\u00e1 de Henares, Madrid, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9308-8133","authenticated-orcid":false,"given":"\u00c1lvaro","family":"Hern\u00e1ndez","sequence":"additional","affiliation":[{"name":"Department of Electronics, University of Alcal\u00e1, 28801 Alcal\u00e1 de Henares, Madrid, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David","family":"Gualda-G\u00f3mez","sequence":"additional","affiliation":[{"name":"Signal Theory and Communications Department, Rey Juan Carlos University, 28942 Fuenlabrada, Madrid, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Santiago","family":"Murano","sequence":"additional","affiliation":[{"name":"Department of Electronics, University of Alcal\u00e1, 28801 Alcal\u00e1 de Henares, Madrid, Spain"},{"name":"Electronics Department, University of Patagonia San Juan Bosco, Comodoro Rivadavia (Chubut), Tierra del Fuego V9410 AQD, Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jorge","family":"Vicente-Ranera","sequence":"additional","affiliation":[{"name":"Department of Electronics, University of Alcal\u00e1, 28801 Alcal\u00e1 de Henares, Madrid, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Francisco","family":"Ciudad-Fern\u00e1ndez","sequence":"additional","affiliation":[{"name":"Department of Electronics, University of Alcal\u00e1, 28801 Alcal\u00e1 de Henares, Madrid, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5900-0978","authenticated-orcid":false,"given":"Jos\u00e9 Manuel","family":"Villadangos","sequence":"additional","affiliation":[{"name":"Department of Electronics, University of Alcal\u00e1, 28801 Alcal\u00e1 de Henares, Madrid, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8293-9665","authenticated-orcid":false,"given":"Rub\u00e9n","family":"Nieto","sequence":"additional","affiliation":[{"name":"Electronics Technology Department, Rey Juan Carlos University, 28933 M\u00f3stoles, Madrid, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,1,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"3483","DOI":"10.1109\/JSYST.2020.2969088","article-title":"BLE Beacons for Indoor Positioning at an Interactive IoT-Based Smart Museum","volume":"14","author":"Spachos","year":"2020","journal-title":"IEEE Syst. 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