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OFDM (orthogonal frequency division multiplexing)-based high-speed rail mobile communication method and system

A mobile communication, high-speed rail technology, applied in multi-frequency code systems, radio relay systems, active power relay systems, etc., can solve problems such as poor compatibility and no unified tunnel communication, reduce feeder loss, avoid Doppler effect of Leer effect and switching problems, reducing equipment cost

Inactive Publication Date: 2011-07-20
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 2.1 The train shields the signal
[0012] 2.2 Tunnel communication problem
At present, there is no unified solution for tunnel communication, and most system implementations implement it as a special section separately, which is poorly compatible with existing systems

Method used

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  • OFDM (orthogonal frequency division multiplexing)-based high-speed rail mobile communication method and system
  • OFDM (orthogonal frequency division multiplexing)-based high-speed rail mobile communication method and system
  • OFDM (orthogonal frequency division multiplexing)-based high-speed rail mobile communication method and system

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Embodiment Construction

[0027] The OFDM signal is transmitted through the power line network connected to the train, and transmitted by wire, which avoids many problems caused by wireless transmission under high-speed movement. The uplink direction includes the following steps: the UE modulates the uplink baseband signal into an OFDM signal, sends it to the radio remote, and the radio remote receives the OFDM signal sent by the UE, and down-converts the signal to a frequency suitable for power line transmission; after digital / analog conversion Finally, the OFDM signal is coupled to the power line through the coupling device, and the signal is transmitted on the power line in OFDM mode; the baseband processing module extracts the OFDM signal from the power line through the coupling device, and performs analog / digital conversion; the baseband processing module converts the received signal Perform baseband processing to complete the uplink transmission process from UE to baseband processing.

[0028] Th...

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Abstract

The invention discloses an OFDM (orthogonal frequency division multiplexing) modulation-based high-speed rail mobile communication method and system. An RRU (radio remote unit) is arranged in a train compartment, and the RRU is communicated with a far-end machine room by a power line connected with a train; the communication between the machine room and the far end of the RRU adopts an OFDM modulation mode; along with an up direction, a signal which is transmitted by a mobile station is transmitted to the far end of the RRU by means of OFDM, is converted by means of down-conversion and D / A (digital-to-analogy) conversion, is coupled to the power line to be transmitted, and is subjected to base band processing in the far-end machine room; and along with a down direction, the machine room is used for modulating a baseband signal into an OFDM signal, wherein the OFDM signal is coupled to the power line to be transmitted, is received at a radio remote end of a base station, is converted by means of A / D (analogy-to-digital) conversion and up-conversion, and is transmitted to the mobile station by the radio remote end of the base station, so that the voice / data communication can be realized.

Description

technical field [0001] The invention relates to high-speed rail mobile communication technology, in particular to a high-speed rail mobile communication system based on OFDM and remote base station. Background technique [0002] As the main continental transportation mode, railway transportation has made great historical contributions to the progress of human society, civilization and the development of science and technology. As an industrial production process, the railway transportation system has gone through various development stages with manpower, machinery, and information as the main body, and is currently developing towards informatization, intelligence, and high-speed direction. Since 2006, my country's railways have begun to build high-speed passenger dedicated lines on a large scale. By 2010, the total mileage of trunk lines and passenger dedicated lines using GSM-R networks will reach 30,000km. The existing analog wireless communication systems will gradually b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B3/54H04B7/15
Inventor 路兆铭温向明郑伟赵岩琨凌大兵巨颖高日新
Owner BEIJING UNIV OF POSTS & TELECOMM
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