Kernkonzepte
Integrating active reconfigurable intelligent surfaces (RISs) can significantly enhance energy transfer efficiency and data transmission performance in wireless-powered communication (WPC) systems for Internet of Things (IoT) networks.
Zusammenfassung
The article investigates the integration of active RISs to improve WPC in IoT networks. Key highlights:
Active RISs employ power amplifiers to boost signal power, mitigating the double-fading attenuation issue faced by passive RISs. This enhances both energy transfer and data transmission efficiency.
Analytical expressions are derived for the ergodic rate and outage probability, considering critical factors like signal amplification, active noise, power consumption, and phase quantization errors.
Optimization of WPC scenarios is explored, focusing on the time-switching factor between energy harvesting and information transmission, as well as the power consumption of the active RIS.
Numerical results validate the analysis, demonstrating that active RISs significantly outperform passive RISs in WPC performance for IoT networks.
Statistiken
The wireless RF power hub transmission power Pp is 20 dB.
The noise power at the active RIS σ^2_v is -80 dBm.
The noise power at the receiver V2 σ^2_n is -80 dBm.
The distance from the power hub P to device V1 dp is 20 m.
The distance from V1 to V2 df is 30 m.
The distance from V1 to each RIS element dhm and from each RIS element to V2 dgm is 20 m.
The path loss exponent ϵ is 3.
The number of active RIS elements M is 36.
The power consumption parameters P1 and P2 are both -10 dBm.
The energy harvesting efficiency η is 0.8.
Zitate
"Active RISs mitigate double-fading attenuation by employing low-power reflection-type amplifiers in each element."
"The enhanced flexibility of the active RIS in terms of energy transfer and information transmission is investigated using adjustable parameters."