7 February 2015 STBC AF relay for unmanned aircraft system
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If a large scale disaster similar to the Great East Japan Earthquake 2011 happens, some areas may be isolated from the communications network. Recently, unmanned aircraft system (UAS) based wireless relay communication has been attracting much attention since it is able to quickly re-establish the connection between isolated areas and the network. However, the channel between ground station (GS) and unmanned aircraft (UA) is unreliable due to UA’s swing motion and as consequence, the relay communication quality degrades. In this paper, we introduce space-time block coded (STBC) amplify-and-forward (AF) relay for UAS based wireless relay communication to improve relay communication quality. A group of UAs forms single frequency network (SFN) to perform STBC-AF cooperative relay. In STBC-AF relay, only conjugate operation, block exchange and amplifying are required at UAs. Therefore, STBC-AF relay improves the relay communication quality while alleviating the complexity problem at UAs. It is shown by computer simulation that STBC-AF relay can achieve better throughput performance than conventional AF relay.
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Fumiyuki Adachi , Fumiyuki Adachi , Hiroyuki Miyazaki, Hiroyuki Miyazaki, Chikara Endo, Chikara Endo, "STBC AF relay for unmanned aircraft system", Proc. SPIE 9387, Broadband Access Communication Technologies IX, 93870M (7 February 2015); doi: 10.1117/12.2084979; https://doi.org/10.1117/12.2084979

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