Concurrent wireless power and information transfer with beamforming for 5G networks

In this study, we investigate a multiple-input single-output non-orthogonal multiple access (MISO-NOMA) system with simultaneous wireless information and power transfer (SWIPT). A base station (BS) equipped with multiple antennas transmits superimposed signals for information and energy via beamforming to multiple single-antenna users. These signals are decoded using successive interference cancellation (SIC). Each user receives a combination of desired signals, interference from higher-priority users, and additive noise, all of which affect performance. The signal-to-interference-plus-noise ratio (SINR) of each user is computed to determine the achievable rate using Shannon’s capacity formula. Additionally, users harvest energy from the received signals based on a specified energy conversion efficiency. To maximize the system’s sum rate, we propose a joint beamforming and power control optimization strategy, ensuring that each user meets a minimum energy harvesting requirement. The optimization is subject to a total transmit power constraint within the available budget. Simulation results using MATLAB confirm the effectiveness of the proposed scheme, demonstrating efficient power allocation, interference mitigation, and improved overall performance in NOMA-based SWIPT systems. Although the model is analyzed for a three-user scenario, the findings offer insights that can be generalized to systems with more users. This research provides a foundation for practical implementation and future enhancements in power distribution and spectral efficiency.