High-speed rail mobile communication system and working method thereof

Abstract

The invention discloses a high-speed rail mobile communication system and a working method thereof. The system comprises a vehicle-mounted communication system, a rail communication system and a ground communication system, wherein the vehicle-mounted communication system comprises a vehicle-mounted base station, a light distribution antenna system and a vehicle-mounted ultra-high frequency wireless wide-band communication machine; the vehicle-mounted ultra-high frequency wireless wide-band communication machine is in communication connection with the vehicle-mounted base station; and the vehicle-mounted base station forms a vehicle-mounted access network in a carriage through the light distribution antenna system. The rail communication system comprises a rail optical cable, a ground ultra-high wireless wide-band communication machine and an optical transmission network, wherein the rail optical cable is laid along the rail and used for transmitting a communication signaling and a communication content, the ground ultra-high wireless wide-band communication machines are sequentially accessed along the optical cable, the ground ultra-high wireless wide-band communication machine is in communication connection with the ground ultra-high wireless wide-band communication machine corresponding to the ground, and the ground ultra-high wireless wide-band communication machines are respectively in communication connection with the corresponding ground communication system through the optical transmission network.

Description

technical field [0001] The invention relates to a communication system, in particular to a high-speed rail mobile communication system and a working method thereof. Background technique [0002] For the current high-speed rail communication problems, the railway department, major operators and relevant management and scientific research institutions have introduced corresponding solutions, and some high-speed railway sections that have been opened earlier also have experimental networks to seek solutions to the high-speed rail communication problems. From the perspective of technical engineering, these solutions can be classified into the following three ways, namely, the way of laying leaky cables along the line, the way of using satellite communication, and the way of building a strip network along the line. [0003] The method of burying leaky cables along the line: burying leaky cables along the line is the simplest way to solve the high-speed rail communication, and the...

AI Technical Summary

Problems solved by technology

However, the efficacy of this correction is limited and typically cannot exceed 2% of the subcarrier spacing

At a speed of 400 kilometers per hour, when communicating with 20G ultra-high frequency, the maximum Doppler frequency shift can reach ±7407Hz, and its absolute value is almost equivalent to the subcarrier spacing of 15KHz in the fourth-generation mobile communication TD-LTE specification. Therefore, conventional deviation correction means is ineffective

[0007] In addition, all wireless communication systems have a key problem of signal fading

The current OFDM method is to reduce the influence of multipath waves by software calculation method, but this calculation method distorts the calculation results due to the influence of high-speed movement, and more complex calculation methods, such as Doppler-Rake to deal with these distortions Will create additional levels of difficulty while making system hardware complex, expensive and less reliable

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