High-speed railway radio-over-fiber communication system and method based on precise channel parameters

Abstract

The invention discloses a high-speed railway radio-over-fiber communication system and method based on precise channel parameters. The system comprises a radio-over-fiber communication vehicle-mountedsubsystem and a radio-over-fiber ground subsystem. A railway line is divided into a series of discrete intervals which are connected in sequence, a long-distance fast time-varying channel in the train operation process is decomposed into a series of short-distance non-time-varying channels, and then the short-distance non-time-varying channels corresponding to the discrete intervals are accurately balanced and compensated in a fixed-point mode. In the train operation process, the current position, speed and direction information of the train are updated in real time according to the time interval delta T; a channel parameter corresponding to the current position point is correspondingly extracted from a channel parameter library; channel equalization and channel compensation are simultaneously carried out in the radio-over-fiber vehicle-mounted subsystem and the ground subsystem respectively, influences under a high-speed railway scene are eliminated or reduced, a radio-over-fiber communication system which covers a whole line and is accurate in channel equalization and compensation is formed, and broadband and stable wireless communication is further achieved between a high-speedtrain and the ground.

Description

technical field [0001] The present invention relates to the field of high-speed railway wireless communication technology and optical-borne wireless communication, in particular to a high-speed railway optical-borne wireless communication system and method based on precise channel parameters. Background technique [0002] At present, high-speed railway (referred to as high-speed railway) is developing rapidly in the world, and has become a key industry supporting the national economy and daily travel and a global strategic emerging industry. As of February 2020, the global high-speed rail operation mileage has reached 52,000 kilometers, of which China's high-speed rail mileage exceeds 35,000 kilometers. The rapid development of high-speed railways has brought important demands for broadband vehicle-to-ground communications: on the one hand, massive data and information such as high-speed railway operation, railway safety monitoring, and equipment maintenance need to be sense...

AI Technical Summary

Problems solved by technology

However, whether it is a broadband optical wireless communication system or other broadband wireless communication systems, high carrier frequency, large bandwidth signals, and high-order modulation formats are more affected by high mobility and the surrounding environment of railways.

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