{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,27]],"date-time":"2025-10-27T16:16:50Z","timestamp":1761581810769,"version":"build-2065373602"},"reference-count":37,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2019,3,19]],"date-time":"2019-03-19T00:00:00Z","timestamp":1552953600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004083","name":"Ministry of Science ICT and Future Planning","doi-asserted-by":"publisher","award":["2016R1A2B1008953"],"award-info":[{"award-number":["2016R1A2B1008953"]}],"id":[{"id":"10.13039\/501100004083","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Device-to-device (D2D) communication is a technique for direct communication between devices without going through a base station or other infrastructure. D2D communication technology has the advantages of improving spectrum efficiency and reducing transmission delay and transmission power. In D2D communication systems, orthogonal frequency-division multiple access (OFDMA) is widely used to maintain similarities with cellular communication systems and to secure transmission distance. OFDMA allows flexible and efficient use of frequency resources by allocating sub-channels independent to each user. In this paper, we consider a D2D overlay system that uses different sub-channels for cellular and D2D communications. In theory, the signals on different sub-channels of an OFDMA system are orthogonal and not interfered with each other. However, in a D2D communication system, which operates in a distributed manner, there is non-negligible interference from other sub-channels because of in-band emissions. In this paper, we address the performance degradation resulting from the interference from other sub-channels for OFDMA-based D2D group-casting systems. We consider three different scenarios of D2D relay, and we find the relay position that minimizes the outage probability. The simulation and analytical results show that the optimal location of a relay can be considerably different according to the source location and the target scenario.<\/jats:p>","DOI":"10.3390\/s19061374","type":"journal-article","created":{"date-parts":[[2019,3,19]],"date-time":"2019-03-19T12:12:25Z","timestamp":1552997545000},"page":"1374","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Relay Positions Considering Interference from Other Sub-Channels in OFDMA-Based D2D Group-Casting Systems"],"prefix":"10.3390","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8741-7412","authenticated-orcid":false,"given":"Minjoong","family":"Rim","sequence":"first","affiliation":[{"name":"Department of Information and Communication Engineering, Dongguk University, Seoul 04602, Korea, <email>dmfgus5118@naver.com<\/email>"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eulhyeon","family":"Go","sequence":"additional","affiliation":[{"name":"Department of Information and Communication Engineering, Dongguk University, Seoul 04602, Korea, <email>dmfgus5118@naver.com<\/email>"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2019,3,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"l185","DOI":"10.1109\/COMST.2015.2447036","article-title":"In-Band Device-to-Device Communication in OFDMA Cellular Networks: A Survey and Challenges","volume":"17","author":"Mach","year":"2015","journal-title":"IEEE Commun. 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