| Abstrakt: |
This paper explores the effects of Doppler shifts in high-mobility communication devices. What's more, it investigates the challenges faced in High-Speed Railways (HSR) communication systems because of deviation of the carrier frequency, which is called Doppler shift, at increasing the relative speed of the relative motion between Transmitter (Tx) and Receiver (Rx). The work here discusses the latest methodologies that achieve optimal or suboptimal solutions, such as channel modeling and new radio technologies. To provide seamless connectivity communication and minimize, regardless of the hard mismatch due to the Doppler, the Doppler Spread Compensator (DSC) technology is promoted to mitigate the Doppler effect. Finally, the paper proposes an innovative and effective approach, including the use of Reconfigurable Intelligent Surfaces (RIS), to improve wireless communication performance and reduce the impact of the Doppler shift. [ABSTRACT FROM AUTHOR] |
