Enhancing Wireless Powered Communications in IoT Networks through Active Reconfigurable Intelligent Surfaces

Belangrijkste concepten

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.

Samenvatting

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.

Statistieken

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.

Citaten

"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."

Belangrijkste Inzichten Gedestilleerd Uit

Optimal Operation of Active RIS-Aided Wireless Powered Communications in IoT Networks

by Waqas Khalid... om arxiv.org 09-17-2024

https://arxiv.org/pdf/2409.09719.pdf

Diepere vragen

How can the performance of active RIS-aided WPC systems be further improved by incorporating advanced beamforming techniques or multi-antenna configurations at the IoT devices?

The performance of active Reconfigurable Intelligent Surface (RIS)-aided Wireless Powered Communication (WPC) systems can be significantly enhanced by integrating advanced beamforming techniques and multi-antenna configurations at the IoT devices. Advanced beamforming techniques, such as adaptive beamforming and spatial multiplexing, allow for the dynamic adjustment of signal directions and power allocation, which can optimize the signal-to-noise ratio (SNR) and mitigate interference. By employing these techniques, the active RIS can effectively steer the transmitted signals towards the intended IoT devices while minimizing the impact of multipath fading and interference from other devices.
Moreover, multi-antenna configurations at the IoT devices can further improve the system's performance by enabling spatial diversity and multiplexing gains. With multiple antennas, IoT devices can exploit spatial diversity to enhance signal reception, thereby improving the overall reliability and throughput of the communication link. This configuration also allows for the implementation of techniques such as Multiple Input Multiple Output (MIMO), which can significantly increase the capacity of the wireless channel. The combination of active RIS with advanced beamforming and multi-antenna systems can lead to a more robust and efficient WPC framework, ultimately enhancing energy transfer and data transmission capabilities in IoT networks.

What are the practical challenges and implementation considerations for deploying active RISs in real-world IoT environments, and how can they be addressed?

Deploying active RISs in real-world IoT environments presents several practical challenges and implementation considerations. One of the primary challenges is the complexity of channel estimation and management. Active RISs require accurate channel state information (CSI) to optimize their performance, which can be difficult to obtain in dynamic environments with varying user locations and mobility. To address this, advanced channel estimation techniques, such as machine learning algorithms, can be employed to predict and adapt to changing channel conditions in real-time.
Another challenge is the power consumption associated with active RISs. While they enhance signal quality and energy transfer, the amplification and processing required can lead to significant power usage, which is critical for energy-constrained IoT devices. Implementing energy-efficient designs and optimizing the power consumption of active RISs through intelligent resource management strategies can mitigate this issue.
Additionally, the physical deployment of active RISs poses logistical challenges, such as optimal placement and alignment to maximize coverage and minimize interference. Utilizing simulation tools and optimization algorithms can help determine the best locations for RIS deployment, ensuring that they effectively enhance the wireless communication environment.

Given the potential synergies between active RISs and other emerging technologies like intelligent reflecting surfaces and reconfigurable intelligent surfaces, how can these technologies be jointly leveraged to optimize wireless communications in future IoT networks?

The integration of active RISs with other emerging technologies, such as intelligent reflecting surfaces (IRS) and reconfigurable intelligent surfaces (RIS), can create a synergistic effect that optimizes wireless communications in future IoT networks. By combining the capabilities of these technologies, it is possible to enhance the overall performance of wireless systems significantly.
For instance, intelligent reflecting surfaces can be utilized to create a more favorable electromagnetic environment by dynamically adjusting the reflection properties of incoming signals. When combined with active RISs, which amplify and control the signals, the two technologies can work together to improve signal quality, reduce latency, and enhance energy efficiency. This collaboration can lead to improved coverage and capacity, particularly in challenging environments with high levels of interference or blockage.
Moreover, the joint deployment of these technologies can facilitate advanced network management strategies, such as coordinated beamforming and resource allocation. By leveraging the collective intelligence of active RISs and IRSs, network operators can optimize the allocation of resources based on real-time channel conditions and user demands, leading to more efficient use of the available spectrum and improved user experience.
In summary, the joint leveraging of active RISs, intelligent reflecting surfaces, and reconfigurable intelligent surfaces can create a robust framework for optimizing wireless communications in future IoT networks, addressing the challenges of coverage, capacity, and energy efficiency.