Abstract
The randomness property of wireless channels restricts the improvement of their performance in wireless networks. As a novel solution for overcoming this, a reconfigurable intelligent surface (RIS) was introduced to reshape wireless physical environments. Initially, the multi-path and Doppler effects are discussed in a case in which a reflector was considered to reflect the incident signal for wireless communication. Subsequently, the results for the transmission signal were analyzed when a reflector was coated with an RIS. Specifically, the multi-path fading stemming from the movement of the mobile transmitter was eliminated or mitigated by utilizing an RIS. Meanwhile, the Doppler effect was also reduced to restrain the rapid fluctuations in the transmission signal by using a tunable RIS in real time. The simulation results demonstrate that the magnitude and spectrum of the received signal can be regulated by an RIS. The multi-path fading and Doppler effect can be effectively mitigated when the reflector is coated with an RIS in wireless networks.
Highlights
Surface-Assisted Wireless Networks.Fifth-generation (5G) wireless networks have greater capabilities for being standardized and will be deployed worldwide in the ten years [1]
Considering a case in which the signal may be received by illegal users, such as eavesdroppers, to solve this problem, we reduce the strength of the received signal for the illegal user by utilizing multi-path fading and the Doppler effect in an reconfigurable intelligent surface (RIS)-assisted wireless network
When the reflector is coated with an RIS, the propagation environment can be controlled by designing the reflection coefficient σ of an RIS to satisfy the requirements of different applications in RIS-assisted wireless networks
Summary
The authors of [19] firstly focused on analyzing the multi-path fading and Doppler effect in RIS-assisted wireless networks. In a traffic communication scenario, we further explore the potential of an RIS in suppressing the degradation of transmission performance due to multi-path fading and the Doppler effect. Considering the direct and reflected links, multi-path fading and the Doppler effect are analyzed when the reflector is coated with an RIS.
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