This paper addresses the problem of prolonging the lifetime of energy-constrained relay nodes in wireless networks by utilizing ambient radio-frequency (RF) signals for both energy harvesting and information processing. The authors propose two relaying protocols, Time Switching Relaying (TSR) and Power Splitting Relaying (PSR), based on time switching and power splitting receiver architectures, respectively. These protocols enable the relay node to harvest energy from the received RF signal and use that energy to forward the source information to the destination. The paper derives analytical expressions for the outage probability and ergodic capacity to determine the throughput for both delay-limited and delay-tolerant transmission modes. Numerical results show that the TSR protocol outperforms the PSR protocol in terms of throughput at relatively low signal-to-noise ratios and high transmission rates. Additionally, the optimal values of the energy harvesting time ($\alpha$) and power splitting ratio ($\rho$) are determined for different system parameters, such as noise power and energy harvesting efficiency. The paper also compares the performance of the proposed protocols with an ideal relay receiver that processes information and extracts power from the same received signal.This paper addresses the problem of prolonging the lifetime of energy-constrained relay nodes in wireless networks by utilizing ambient radio-frequency (RF) signals for both energy harvesting and information processing. The authors propose two relaying protocols, Time Switching Relaying (TSR) and Power Splitting Relaying (PSR), based on time switching and power splitting receiver architectures, respectively. These protocols enable the relay node to harvest energy from the received RF signal and use that energy to forward the source information to the destination. The paper derives analytical expressions for the outage probability and ergodic capacity to determine the throughput for both delay-limited and delay-tolerant transmission modes. Numerical results show that the TSR protocol outperforms the PSR protocol in terms of throughput at relatively low signal-to-noise ratios and high transmission rates. Additionally, the optimal values of the energy harvesting time ($\alpha$) and power splitting ratio ($\rho$) are determined for different system parameters, such as noise power and energy harvesting efficiency. The paper also compares the performance of the proposed protocols with an ideal relay receiver that processes information and extracts power from the same received signal.