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Optimal Power Management to Minimize SER in Amplify and-Forward Relay Networks | ||
| AUT Journal of Electrical Engineering | ||
| مقاله 4، دوره 50، شماره 1، شهریور 2018، صفحه 33-42 اصل مقاله (1.14 M) | ||
| نوع مقاله: Research Article | ||
| شناسه دیجیتال (DOI): 10.22060/eej.2017.13060.5131 | ||
| نویسندگان | ||
| M. Abedi؛ M. J Emadi* | ||
| Electrical Engineering Department, Amirkabir University of Technology, Tehran, Iran | ||
| چکیده | ||
| This paper studies optimal power allocation to minimize symbol error rate (SER) of amplify-and-forward cooperative diversity networks. First, we analytically solve optimal power allocation problem to minimize SER for three different scenarios, namely, multi-branch single-relay, single-branch multi-relay and multi-branch multi-relay cooperative diversity networks, all subject to a given total relay power consumption. In addition to the total relay power constraint, for the multi-branch single-relay scenario. Next, we assume that every single relay is subject to a maximum power constraint. To this end, we present an iterative algorithm to find the optimal power rates. Finally, we study an off-line scenario in which the relays are energy harvester and equipped with infinite-sized batteries. For this scenario, the maximum SER is minimized over the whole harvesting time slots. We propose a water filling algorithm for the classical relay channel and an iterative algorithm for the multi-branch single-relay cooperative scheme. Through the numerical results, it is shown that optimal power allocation policies enhance the system performance. | ||
| کلیدواژه‌ها | ||
| Cooperative diversity network؛ Optimal power allocation؛ Symbol error rate؛ Water filling algorithm؛ Battery | ||
| مراجع | ||
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