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A comprehensive study on mmWave-based mobile hotspot network system for high-speed train communications

: Kim, J.; Schmieder, M.; Peter, M.; Chung, H.; Choi, S.; Kim, I.; Han, Y.


IEEE transactions on vehicular technology 68 (2019), Nr.3, S.2087-2101
ISSN: 0018-9545
Fraunhofer HHI ()

This paper presents a comprehensive study on millimeter wave (mmWave)-based mobile hotspot network (MHN) system for high-speed train (HST) communications, including system design, field trial, channel modeling based on measurement campaign, simulation and validation. Firstly, an overview of the MHN system and the design of MHN enhanced (MHN-E) system including physical layer specification and single frequency network (SFN) are provided. Secondly, the overall design of prototypes for MHN conventional (MHN-C) and MHN-E systems are presented, and then the recent experimental results of a field trial conducted at Seoul subway line 8 with the MHN-C prototype and demonstrations with the MHN-E prototype are analyzed. Thirdly, the paper presents a measurement campaign investigating channel characteristics of a rural HST environment and a QuaDRiGa-based channel model developed based on the parameters extracted from the measurements. Lastly, a computer simulation is conducted to validate the performance of the MHN-E system at high-mobility of up to 500 km/h under the QuaDRiGa channel model, which suggests a good methodology for the validation of HST communication systems at the high-mobility since it is impractical to be tested by real testbeds as of now. The simulation results revealed that the MHN-E system is capable of providing a broadband mobile wireless backhaul (MWB) with a peak data rate exceeding 5 Gbps at a speed of 500 km/h.