CN207251591U - A kind of GSM R systems frequency shift (FS) automatic correction device - Google Patents
A kind of GSM R systems frequency shift (FS) automatic correction device Download PDFInfo
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- CN207251591U CN207251591U CN201720711881.7U CN201720711881U CN207251591U CN 207251591 U CN207251591 U CN 207251591U CN 201720711881 U CN201720711881 U CN 201720711881U CN 207251591 U CN207251591 U CN 207251591U
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Abstract
The utility model provides a kind of GSM R systems frequency shift (FS) automatic correction device, uplink low-noise amplifier, three-mixer, uplink A/D converter, uplink FPGA processor, uplink D/A converter, 4th frequency mixer and uplink power amplifier are sequentially connected, downlink low-noise amplifier, first frequency mixer, downlink A/D converter, downlink FPGA processor, downlink D/A converter, second frequency mixer and downlink power amplifier are sequentially connected, second duplexer connects the downlink power amplifier respectively, uplink low-noise amplifier and retransmitting antenna, first duplexer connects the uplink power amplifier respectively, uplink low-noise amplifier and donor antenna, improve the communication quality of GSM R systems.
Description
Technical field
A kind of means for correcting is the utility model is related to, refers in particular to a kind of GSM-R system frequency excursions automatic correction device.
Background technology
GSM-R be merged on the basis of public network GSM technology dispatching communication function dedicated for railway wireless communication
Digital clustering communication system.GSM-R outstanding features are that High Speed Railway Trains are automatically controlled the transmission of information and with voice communication
Based on dispatching communication uniformly include same radio communication platform, be a perfect in shape and function, realize Signal ＆ Communication Integration
Advanced efficient communication system.
At present, GSM-R digital mobile communication systems are the communication mode of China railways mobile communication standard；China has become
The high-speed railway operation country that mileage is most long, building scale is maximum in the world；In recent years, high speed railway construction is in worldwide
In high speed development trend, high-speed railway it is fast-developing for high-speed railway wireless communication system, be both an opportunity, and one
A huge challenge.Continuous with Development of High Speed Railway accelerates, in order to adapt to the particularity of high-speed railway environment, and into one
Step meets the growing communication requirement of mobile subscriber, and research is had become based on GSM-R communication radio frequency extension unit systems
Hot spot, at the same time, the importance for studying design of the doppler shift effect under high-speed railway scene to communication system are also cured
Add protrusion.
In the case of high-speed mobile, due to Doppler effect between terminal and base station (or Remote Radio Unit), it can produce
Raw frequency shift (FS), so that being synchronously difficult to set up, keeping.
The content of the invention
The technical problems to be solved in the utility model, is to provide a kind of GSM-R system frequency excursions automatic correction device,
Improve the communication quality of GSM-R systems.
The utility model is realized in this way：A kind of GSM-R system frequency excursions automatic correction device, including retransmit day
Line, donor antenna, first duplexer, the second duplexer, uplink low-noise amplifier, three-mixer, uplink A/D converter,
Uplink FPGA processor, uplink D/A converter, the 4th frequency mixer, uplink power amplifier, downlink low-noise amplifier, the first frequency mixer,
Downlink A/D converter, downlink FPGA processor, downlink D/A converter, the second frequency mixer and downlink power amplifier, the uplink are low
Noise amplifier, three-mixer, uplink A/D converter, uplink FPGA processor, uplink D/A converter, the 4th frequency mixer with
And uplink power amplifier is sequentially connected, the downlink low-noise amplifier, the first frequency mixer, downlink A/D converter, downlink FPGA processing
Device, downlink D/A converter, the second frequency mixer and downlink power amplifier are sequentially connected, second duplexer connect respectively it is described under
Row power amplifier, uplink low-noise amplifier and retransmitting antenna, it is low that the first duplexer connects the uplink power amplifier, uplink respectively
Noise amplifier and donor antenna.
The utility model has the advantage of：A kind of GSM-R system frequency excursions automatic correction device of the utility model, the dress
The characteristics of quickly being moved for railway is put, by quickly estimating the frequency shift (FS) as caused by high-speed mobile, then is compensated, from
And reduce the influence that Doppler effect communicates GSM-R, improve the communication quality of GSM-R systems.
Brief description of the drawings
The utility model is further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is a kind of schematic diagram of GSM-R system frequency excursions automatic correction device of the utility model.
Embodiment
Refering to Figure 1, the utility model GSM-R system frequency excursion automatic correction devices, including retransmitting antenna, apply
Primary antenna, first duplexer, the second duplexer, uplink low-noise amplifier, three-mixer, uplink A/D converter, uplink
FPGA processor, uplink D/A converter, the 4th frequency mixer, uplink power amplifier, downlink low-noise amplifier, the first frequency mixer, downlink
A/D converter, downlink FPGA processor, downlink D/A converter, the second frequency mixer and downlink power amplifier, the uplink low noise
Amplifier, three-mixer, uplink A/D converter, uplink FPGA processor, uplink D/A converter, the 4th frequency mixer and on
Row power amplifier is sequentially connected, the downlink low-noise amplifier, the first frequency mixer, downlink A/D converter, downlink FPGA processor,
Downlink D/A converter, the second frequency mixer and downlink power amplifier are sequentially connected, and second duplexer connects the downlink work(respectively
Put, uplink low-noise amplifier and retransmitting antenna, the first duplexer connect the uplink power amplifier, uplink low noise respectively
Amplifier and donor antenna.
GSM-R system auto frequency offsets means for correcting is suitable for high-speed railway (more than 350km/h), maglev
(speed per hour is up to 431km/h), subway etc. lead to not connect, the occasion of the phenomenon such as call drop due to doppler shift effect.The dress
Put with it is easy for installation, construction investment is low, it is quick the advantages that, there is high cost performance.Equipment block diagram such as attached drawing Fig. 1：
GSM-R communication system frequencies deviate automatic correction device block diagram.Each function, which refers to, to be described as follows：
1) uplink low noise amplifier and downlink low noise amplifier
Low-noise amplifier is carried out to the faint GSM-R radiofrequency signals of business antenna end input, base station is reduced and receives noise
Level, improves signal-to-noise ratio.
2) the first frequency mixer and the second frequency mixer (downlink)
Frequency spectrum shift is carried out to radiofrequency signal, radiofrequency signal is moved to intermediate frequency and is handled.
3) uplink A/D converter and downlink A/D converter
Analog signal digital, is converted into digital signal by analog signal and is handled.
4) uplink FPGA processor and downlink FPGA processor
FPGA is given through the transformed digital signals of A/D and is demodulated processing, calculates its frequency error, this frequency is missed
Frequency deviation of the difference as output reference frequency, can solve Doppler frequency shift caused by excessive velocities handoff procedure.
5) uplink D/A converter and downlink D/A converter
Digital signal is simulated, converts digital signals into analog signal and is handled.
6) three-mixer and the 4th frequency mixer (uplink)
Frequency spectrum shift is carried out to intermediate-freuqncy signal, intermediate-freuqncy signal is moved to emission of radio frequency signals and goes out.
The device searches for 124 channels in initialization first, i.e., they are carried out power scan by all BCH passages,
Most strong bcch carrier is selected into line trace；Then continuous detection, most 11 frames, find FCCH.First coarse frequency is carried out using FFT
Estimation, carries out smart Frequency Estimation again after correction, then is corrected, and is asked with frequency shift (FS) caused by reduction Doppler effect as far as possible
Topic.
Although the foregoing describing specific embodiment of the present utility model, those familiar with the art should
Working as understanding, we are merely exemplary described specific embodiment, rather than for the limit to the scope of the utility model
Equivalent modification and change fixed, that those skilled in the art are made in the spirit according to the utility model, all should
Cover in the scope of the claimed protection of the utility model.
Claims (1)
- A kind of 1. GSM-R system frequency excursions automatic correction device, it is characterised in that：Including retransmitting antenna, donor antenna, first Duplexer, the second duplexer, uplink low-noise amplifier, three-mixer, uplink A/D converter, uplink FPGA processor, on Row D/A converter, the 4th frequency mixer, uplink power amplifier, downlink low-noise amplifier, the first frequency mixer, downlink A/D converter, under Row FPGA processor, downlink D/A converter, the second frequency mixer and downlink power amplifier, the uplink low-noise amplifier, the 3rd mix Frequency device, uplink A/D converter, uplink FPGA processor, uplink D/A converter, the 4th frequency mixer and uplink power amplifier connect successively Connect, the downlink low-noise amplifier, the first frequency mixer, downlink A/D converter, downlink FPGA processor, downlink D/A conversions Device, the second frequency mixer and downlink power amplifier are sequentially connected, and second duplexer connects the downlink power amplifier, uplink low noise respectively Acoustic amplifier and retransmitting antenna, the first duplexer connect respectively the uplink power amplifier, uplink low-noise amplifier and Donor antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720711881.7U CN207251591U (en) | 2017-06-19 | 2017-06-19 | A kind of GSM R systems frequency shift (FS) automatic correction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720711881.7U CN207251591U (en) | 2017-06-19 | 2017-06-19 | A kind of GSM R systems frequency shift (FS) automatic correction device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207251591U true CN207251591U (en) | 2018-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720711881.7U Active CN207251591U (en) | 2017-06-19 | 2017-06-19 | A kind of GSM R systems frequency shift (FS) automatic correction device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111356235A (en) * | 2018-12-24 | 2020-06-30 | 成都鼎桥通信技术有限公司 | PDT and LTE frequency distribution method under wide-narrow fusion system |
-
2017
- 2017-06-19 CN CN201720711881.7U patent/CN207251591U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111356235A (en) * | 2018-12-24 | 2020-06-30 | 成都鼎桥通信技术有限公司 | PDT and LTE frequency distribution method under wide-narrow fusion system |
| CN111356235B (en) * | 2018-12-24 | 2022-06-03 | 成都鼎桥通信技术有限公司 | PDT and LTE frequency distribution method under wide-narrow fusion system |
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