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GSM-R system frequency shift automatic correction method

A system frequency, automatic correction technology, applied in the direction of electrical components, transmitter monitoring, receiver monitoring, etc., can solve the problems of frequency offset, synchronization difficult to establish and maintain, etc., to achieve the effect of reducing Doppler frequency offset

Inactive Publication Date: 2017-10-24
福州智程信息科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the case of high-speed movement, due to the Doppler effect, there will be a frequency offset between the terminal and the base station (or remote radio unit), which makes it difficult to establish and maintain synchronization

Method used

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  • GSM-R system frequency shift automatic correction method

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0022] The GSM-R system frequency offset automatic correction method of the present invention comprises the following steps:

[0023] Step 1. Search 124 channels, that is, all BCH channels, perform a power scan on them, and select the strongest BCCH carrier to camp on;

[0024] Step 2, since the data in the FCCH frame is all 1s, it is a sine wave with a frequency of 67kHz after gmsk modulation, and performs FFT calculations on (2N+1) frequency points in the 156-bit long input sequence each time, if the FFT If the peak value continuously appears at tap 8, then the FCCH frame is found; otherwise, the next 156-bit input sequence continues to perform the same processing until the FCCH frame is detected, and the (2N+1) frequency points include: 67kHz frequency point, And with the 67kHz frequency point as the center, N frequency points are selected on both sides,

[0025] According to the formula,

[0026] In the above formula, Δf is the frequency offset value, T is the time int...

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Abstract

The invention provides a GSM-R system frequency shift automatic correction method. The GSM-R system frequency shift automatic correction method includes the steps: searching 124 channels, that is, all BCH channels, performing power scanning on the channels, and selecting the strongest BCCH carrier wave to quarter; detecting an FCCH frame; searching an SCH frame after finding the next frame of the FCCH frame, and then performing demodulation; and according to the features of quick movement of a railway, quickly estimating frequency shift caused by high speed movement, and then performing compensation so as to reduce the influence of Doppler effect on GSM-R communication and improve the communication quality of the GSM-R system.

Description

technical field [0001] The invention relates to an automatic correction method for GSM-R system frequency offset. Background technique [0002] GSM-R is a digital trunking communication system specially used for railway wireless communication, which integrates the dispatching communication function based on the public network GSM technology. The outstanding feature of GSM-R is that it integrates the transmission of high-speed railway train automatic control information and dispatching communication mainly based on voice communication into the same wireless communication platform. It is an advanced and efficient communication system with complete functions and integrated communication signals. [0003] At present, the GSM-R digital mobile communication system is the communication method of my country's railway mobile communication standard; China has become the country with the longest operating mileage of high-speed railways and the largest scale of construction in the world...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/00H04B17/11H04B17/21
CPCH04W24/00H04B17/11H04B17/21
Inventor 本杰明.K.许刘聪江
Owner 福州智程信息科技有限公司
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