Nonlinear Energy Harvesting Based Relaying for Efficient Multi-Rate SWIPT in Energy-Constrained Networks

This work investigates the performance of a wireless system with a single relay that simultaneously harvests energy and forwards information using the power splitting relaying protocol (PSR). A nonlinear energy harvesting model has been developed with a realistic approach by incorporating circuit parameters, along with a multi-rate selection capability to improve system performance. Performance analysis is performed with statistical/fixed and instantaneous/dynamic channel state information (CSI) based on the PSR parameter (ρ) to examine its role in improving system performance. Furthermore, the effects of varying PSR parameters and the maximum number of transmission rates on system throughput (τ) have been examined. The graphical results demonstrate that the multirate scheme provides significant performance gain in terms of throughput over the single-rate scheme using a nonlinear energy harvesting approach. The findings highlight the potential of the proposed framework for energy-constrained wireless networks, particularly in IoT applications.