BUFFER AIDED RELAYING SYSTEM WITH ENERGY HARVESTING NODES

In this paper, a optimal power allocation for buffer aided relaying systems with Energy Harvesting (EH) node, where EH means source communicates with destination via EH Decode-and-Forward relay over the fading channels. A new relaying protocol employing adaptive link selection, i.e., in any given time slot, based on the channel information of the source to relay and the relay to destination link a decision is made whether the source or the relay transmits. In order to avoid data loss at the relay, adaptive link selection requires the relay to be equipped with a buffer such that data can be queued until the relay to destination link is selected for transmission. The main aim of this paper, is to maximize the system throughput and SNR of the system. In this work, the propose offline and online power allocation. For offline power allocation case, the source and relay transmit the powers along with the link sekection result in a mixed integer non linear non linear program which the spatial branch and bound method used to solve optimally. For online power allocation case, a Dynamic Programming (DP) approach is use. To alleviate the complexity inherent to DP, several suboptimal online power allocation scheme is propose. Furtermore, a modified link selection protocol which avoids buffer overflow by limiting the queue size. Also introducing the RSS technique with buffer aided relaying system. The analytical and numerical result show that buffer aided relaying with RSS adaptive link selection achieves significant throughput gain compared to without RSS buffer aided relaying system where the relay employs a fixed schedule for reception and transmission.