Abstract—This paper investigates and proposes real-time and adaptive power-splitting approach with relay selection scheme for multi-terminal decode and forward ultrawideband (DF-UWB) relay network. The channel state information (CSI) technique allows for the adaptive power splitting (ASP) approach to be investigated. The ASP approach analyzes the adaptation of the multi-terminal relay nodes to power splitting (PS) ratio with scalable accomplishment in the gap between the energy-saved and the retransmitted signal. Since the relay are multi-terminal and acts as intermediaries between the source and the destination nodes, an optimal relay selection scheme is introduced to select the best relay that will forward the decoded information packets back and forth from the source to the destination. Furthermore, the need to maintain better outage performance w.r.t the multi-terminal relay network scheme is demonstrated in the simulation works while a scalable and enhanced Dinkelbach iterative algorithm is introduced to keep the worst end-to-end signal-to-noise ratio (SNR) for the multi terminal relay links at the barest minimum.