论文标题
使用可重构智能表面的短距离环境反向散射通信
Short-Range Ambient Backscatter Communication Using Reconfigurable Intelligent Surfaces
论文作者
论文摘要
已经引入了环境反向散射通信（AMBC），以解决短期和低功率互联网应用程序（IoT）应用程序的通信和功率效率问题。另一方面，最近提出了可重构智能表面（RIS）作为一种有前途的方法，可以控制传播环境，尤其是在室内通信环境中。在本文中，我们通过环境正交 - 频率 - 划分 - 多路复用（OFDM）子载体在频域中与RIS结合使用RIS，以实现短程通信方案。一个标签可通过WiFi接入点广播的每个OFDM子载波发送一个位。然后，RI通过补偿多径通道对入射信号的相失真效应来增强读取器的信号质量。我们还利用了OFDM的特殊频谱结构，以通过其在频域中挤压的正交子载波传输更多数据。因此，所提出的方法改善了比特率（BER）性能，并与现有的AMBC方法相比提供了更高的数据速率。分析和数值评估表明，在BER和数据速率方面，提出的方法的表现出色。
Ambient backscatter communication (AmBC) has been introduced to address communication and power efficiency issues for short-range and low-power Internet-of-Things (IoT) applications. On the other hand, reconfigurable intelligent surface (RIS) has been recently proposed as a promising approach that can control the propagation environment especially in indoor communication environments. In this paper, we propose a new AmBC model over ambient orthogonal-frequency-division-multiplexing (OFDM) subcarriers in the frequency domain in conjunction with RIS for short-range communication scenarios. A tag transmits one bit per each OFDM subcarrier broadcasted from a WiFi access point. Then, RIS augments the signal quality at a reader by compensating the phase distortion effect of multipath channel on the incident signal. We also exploit the special spectrum structure of OFDM to transmit more data over its squeezed orthogonal subcarriers in the frequency domain. Consequently, the proposed method improves the bit-error-rate (BER) performance and provides a higher data rate compared to existing AmBC methods. Analytical and numerical evaluations show the superior performance of the proposed approach in terms of BER and data rate.
