{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,12]],"date-time":"2026-04-12T19:57:58Z","timestamp":1776023878183,"version":"3.50.1"},"reference-count":40,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2022,4,8]],"date-time":"2022-04-08T00:00:00Z","timestamp":1649376000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100009056","name":"University of West Bohemia","doi-asserted-by":"publisher","award":["SGS-2021-005: Research, development, and implementation of modern electronic and information systems"],"award-info":[{"award-number":["SGS-2021-005: Research, development, and implementation of modern electronic and information systems"]}],"id":[{"id":"10.13039\/100009056","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Popular small satellites host individual sensors or sensor networks in space but require ground stations with directional antennas on rotators to download sensors\u2019 data. Such ground stations can establish a single downlink communication with only one satellite at a time with high vulnerability to system outages when experiencing severe channel impairments or steering engine failures. To contribute to the area of improving the reception quality of small satellites signals, this paper presents a simple receive diversity scheme with proposed processing algorithms to virtually combine satellite downlink streams collected from multiple omnidirectional receivers. These algorithms process multiple received versions of the same signal from multiple geographically separated receiving sites to be combined in one virtual ground station. This virtual ground station helps detect the intended signal more reliably based only on a network of simple and cooperating software-defined radio receivers with omnidirectional antennas. The suggested receive diversity combining techniques can provide significant system performance improvement if compared to the performance of each individual receiving site. In addition, the probability of system outages is decreased even if one or more sites experience severe impairment consequences. Simulation results showed that the bit error rate (BER) of the combined stream is lower than the BER of the best quality receiving site if considered alone. Moreover, virtual ground stations with cooperative omnidirectional reception at geographically separated receivers also allow data to be received from multiple satellites in the same frequency band simultaneously, as software-defined receivers can digitize a wider portion of the frequency band. This can be a significant conceptual advantage as the number of small satellites transmitting data grows, and it is reasonable to avoid the corresponding necessary increase in the number of fully equipped ground stations with rotators.<\/jats:p>","DOI":"10.3390\/s22082856","type":"journal-article","created":{"date-parts":[[2022,4,9]],"date-time":"2022-04-09T05:13:08Z","timestamp":1649481188000},"page":"2856","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Cooperative Reception of Multiple Satellite Downlinks"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3113-9710","authenticated-orcid":false,"given":"Haidar N.","family":"Al-Anbagi","sequence":"first","affiliation":[{"name":"Department of Electronics and Information Technology, Faculty of Electrical Engineering, University of West Bohemia, 30100 Pilsen, Czech Republic"},{"name":"Department of Communications Engineering, College of Engineering, University of Diyala, Diyala 32001, Iraq"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ivo","family":"Vertat","sequence":"additional","affiliation":[{"name":"Department of Electronics and Information Technology, Faculty of Electrical Engineering, University of West Bohemia, 30100 Pilsen, Czech Republic"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,4,8]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"565","DOI":"10.1109\/TWC.2020.3026471","article-title":"Learnable MIMO detection networks based on inexact ADMM","volume":"20","author":"Kim","year":"2020","journal-title":"IEEE Trans. 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