@article { author = {Abedi, M. and Emadi, M. J}, title = {Optimal Power Management to Minimize SER in Amplify and-Forward Relay Networks}, journal = {AUT Journal of Electrical Engineering}, volume = {50}, number = {1}, pages = {33-42}, year = {2018}, publisher = {Amirkabir University of Technology}, issn = {2588-2910}, eissn = {2588-2929}, doi = {10.22060/eej.2017.13060.5131}, abstract = {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.}, keywords = {Cooperative diversity network,Optimal power allocation,Symbol error rate,Water filling algorithm,Battery}, url = {https://eej.aut.ac.ir/article_1983.html}, eprint = {https://eej.aut.ac.ir/article_1983_e77023186bc81d9a069d48f6d5e36c6c.pdf} }