Performance Investigation of High-Speed Train OFDM Systems under the Geometry-Based Channel Model

Authors

  • Do Viet Ha Faculty of Electrical and Electronic Engineering, University of Transport and Communications (UTC), Hanoi, Vietnam
  • Trinh Thi Huong Faculty of Electrical and Electronic Engineering, University of Transport and Communications (UTC), Hanoi, Vietnam
  • Nguyen Thanh Hai Faculty of Electrical and Electronic Engineering, University of Transport and Communications (UTC), Hanoi, Vietnam

Abstract

The high-speed of train (HST) in combination with the high carrier frequency of HST systems leads to the severe inter carrier interference (ICI) in the HST orthogonal frequency division multiplexing (HST-OFDM) systems. To avoid the complexity in OFDM receiver design for ICI eliminations, the OFDM system parameters such as symbol duration, signal bandwidth, and the number of subcarriers should be chosen appropriately. This paper aims to propose a process of HST-OFDM system performance investigation to determine these parameters in order to enhance spectral efficiency and meet a given quality-of-service (QoS) level. The signal-to-­interference-­plus-­noise ratio (SINR) has been used as a figure of merit to analyze the system performance instead of signal-to-noise ratio (SNR) as most of recent research studies. Firstly, using the non-stationary geometry-based stochastic HST channel model, the SINR of each subcarrier has been derived for different speeds of the train, signal bandwidths, and number of subcarriers. Consequently, the system capacity has been formulated as the sum of all the single channel capacity from each sub-carrier. The constraints on designing HST-OFDM system parameters have been thoughtfully analyzed using the obtained expressions of SINR and capacity. Finally, by analyzing the numerical results, the system parameters can be found for the design of HST-OFDM systems under different speeds of train. The proposed process can be used to provide hints to predict performance of HST communication systems before doing further high cost implementations as hardware designs.

Author Biographies

Do Viet Ha, Faculty of Electrical and Electronic Engineering, University of Transport and Communications (UTC), Hanoi, Vietnam

Do Viet Ha received the B.S, M.Sc., and Ph.D. degrees in Electronic and Telecommunication Engineering from Hanoi University of Science and Technology (HUST), Hanoi, Vietnam, in 2001, 2007, and 2017, respectively. She is currently working with the Department of Electronic Engineering, University of Transport and Communications, Hanoi, Viet Nam, as a lecturer. Her main areas of research interest are mobile channel modeling, wideband OFDM systems, and mobile-to-mobile communications.

Trinh Thi Huong, Faculty of Electrical and Electronic Engineering, University of Transport and Communications (UTC), Hanoi, Vietnam

Trinh Thi Huong received bachelar and master degrees in electronics and telecommunications from University of Transport and Communications, Hanoi, Vietnam in 2003 and 2006, respectively.  She completed her Ph.D. degree in 2018 in Telecommunication Engineering from Hanoi University of Science and Technology (HUST), Hanoi, Vietnam. She is a lecturer at Faculty of Electrical and Electronic Engineering, University of Transport and Communications, Hanoi, Vietnam. Her research interests include space-time signal processing, advanced wireless communication and localisation systems for high speed rail. 

Nguyen Thanh Hai, Faculty of Electrical and Electronic Engineering, University of Transport and Communications (UTC), Hanoi, Vietnam

Nguyen Thanh Hai received his Diploma Engineer in 1991. He completed his Ph.D. degree in 1996 in Automation Process (Transport) in the Institute of Control System, Telecommunication and Electrification, Moscow State University of Railway Engineering (MIIT), Russian. He is an Assoc. Prof, Faculty of Electrical and Electronic Engineering, University of Transport and Communications (UTC), Vietnam. His research interests are in the areas of Optimal Control, Power Electronic, Intelligent Transport System (ITS), Signal Processing and Embedded System.

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Published

2024-04-19

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Wireless and Mobile Communications