CN101801008A - Field intensity covering method for high-speed moving object - Google Patents
Field intensity covering method for high-speed moving object Download PDFInfo
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- CN101801008A CN101801008A CN201010004143A CN201010004143A CN101801008A CN 101801008 A CN101801008 A CN 101801008A CN 201010004143 A CN201010004143 A CN 201010004143A CN 201010004143 A CN201010004143 A CN 201010004143A CN 101801008 A CN101801008 A CN 101801008A
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Abstract
The invention provides a field intensity covering method for a high-speed moving object with low construction cost and good communication quality. The method comprises the following steps: fixed end signal transmission, in which, a broadband IP digital signal is modulated to a radio frequency signal, the frequency of the radio frequency signal is between 100MHz and 7GHz, and the radio frequency signal is transmitted through an antenna; and mobile end signal receiving, in which, a mobile end receives signals, demodulates the signal into the broadband IP digital signal after Doppler frequency difference correction and outputs the signal to each micro-base station through the output end of an exchange, and each micro-base station outputs mobile signals of various systems through combination of a combiner to realize signal coverage in the moving body through cables or antennae. The method fundamentally eliminates the Doppler Effect in the communication process and connection failure caused by cross-region handover of the high-speed moving object, and ensures excellent connection quality.
Description
Technical field
The present invention relates to a kind of microwave communication field, particularly a kind of field intensity covering method for high-speed moving object, it is used for microwave signal is covered to high-speed mobile unit.
Background technology
High-speed mobile unit is more and more, automobile as fast running, train etc., these high-speed mobile units are when travelling less than the 120km/h speed per hour, existing radio communication still can normally be used, but when the speed of high-speed mobile unit during greater than 160km/h, Doppler effect is fairly obvious, crossing district's switching generation in the communication process goes offline, this is because communication terminal detects a stronger field intensity and when base station requests is switched, up signal arrives the base station and before the instruction that sends arrives communication terminal, communication terminal has entered another stronger field strength coverage territory, causes going offline thereby communication terminal can't in time receive the instruction of base station transmission.
In order to solve this problem of Doppler effect, people adopt increases the doppler correction device on high-speed mobile unit, the signal that is about to receive carries out doppler correction, though can improve speech quality to a certain extent, but because delay problem, handover causes disconnection still not solve.
Also having a kind of way is with digital fiber the field strength coverage territory to be elongated along the railway, increases power simultaneously, can prevent the frequent switching problem of Doppler effect though do like this, and energy loss is big, causes large-scale electromagnetic pollution simultaneously.
The more important thing is, its signal frequency of different Virtual network operators is different, each operator need adopt the mode of base station+repeater to carry out the network coverage respectively, if all adopt aforementioned building method that high-speed mobile unit is carried out doppler correction, construction cost height not only then, and the operation cost increase, electromagnetic pollution is big, and can't solve the disconnection that frequent switching causes.
Summary of the invention
The purpose of this invention is to provide that a kind of construction cost is low, the field intensity covering method for high-speed moving object of good communication quality.
The technical solution adopted in the present invention is such: a kind of field intensity covering method for high-speed moving object comprises the steps:
1) fixed end signal transmission: the broadband IP digital signal is modulated into radiofrequency signal, and the frequency of described radiofrequency signal is 100MHz～7GHz, according to moving body speed this radiofrequency signal is carried out launching by antenna after pre-frequency difference is handled;
2) the mobile terminal signal receives: the mobile terminal receives this radiofrequency signal by antenna and carries out multispectral reining in and demodulate the broadband IP digital signal after frequency difference is proofreaied and correct, the broadband IP digital signal is exported to each little base station respectively by each output of switch, exported the movable signal of various standards again by each little base station, each movable signal realizes that at moving body signal covers by cable or antenna after mixer closes the road.
Specifically, described field intensity covering method for high-speed moving object, described movable signal are the movable signals of any one or multiple standard among GSM, CDMA, WCDMA, TD-SCDMA, GSMR, TATRE, CMMB and the WI-FI.
By adopting the aforementioned techniques scheme, the invention has the beneficial effects as follows: move IP by the broadband and insert the method that adds little base station, fundamentally eliminated Doppler effect and the switching disconnection of high-speed mobile unit in communication process, guarantee good speech quality, solve many nets covering problem by the transmission of list net simultaneously, the networking cost of saving more than 80% reduces the pollution of 90% environment electromagnetics simultaneously.
Below in conjunction with accompanying drawing the present invention is specified for an embodiment.
Description of drawings
Fig. 1 is an embodiment fixed end signal flow chart;
Fig. 2 is an embodiment mobile terminal signal flow graph.
Embodiment
Design philosophy of the present invention is: movable signal such as the little base station of GSM, CDMA, WCDMA, TD-SCDMA, GSMR, TATRE, CMMB and WI-FI digital signal based on various standards realize IPization, it is the IP signal that signal is inserted in little base station, ground IP signal through modulate emission to high-speed mobile unit.High-speed mobile unit carries out demodulating little base station needed number signal after frequency difference is proofreaied and correct.Mobile communication signal is handled modulate emission by little base station, on moving body, carry out the network coverage by mixer, this network coverage can be that cable can be an antenna also, and terminal equipment such as handheld terminal, computer terminal or video terminal can communicate with the terminal equipment on ground after receiving this signal.The signal of terminal emission receives back output IP digital signal by little base station, the IP digital signal is modulated into radiofrequency signal and carries out pre-frequency difference and handle after antenna is transmitted into ground, ground base station carries out the radiofrequency signal that is received to demodulate the broadband IP digital signal after frequency difference is proofreaied and correct, so fundamentally solve Doppler effect problem and mistake district switching problem that existing movable signal produces in transmission course, guaranteed communication quality.
Embodiment discloses the field intensity covering method between a kind of ground and the bullet train (speed per hour is 300km/h), its objective is to realize that existing 2G and 3G movable signal comprise that GSM, CDMA, WCDMA, the TD-SCDMA field intensity on bullet train covers.This method comprises two steps:
1, fixed end signal transmission: with reference to figure 1,2G or NodeB controller are by optical fiber output broadband IP digital signal, the broadband IP digital signal of Optical Fiber Transmission is modulated into broadband rf signal by stiff end BDA (being modulator), the frequency of described radiofrequency signal is 100MHz～7GHz, this radiofrequency signal is carried out launching by antenna after pre-frequency difference is handled, described pre-frequency difference handles and on 03 04th, 2009 disclosed application number is 200810071853, denomination of invention is that the Doppler frequency difference processing that reaches described in a kind of method for correcting Doppler frequency difference of high speed moving body is identical, is exactly the pilot signal that benchmark VCO of stack produces in radiofrequency signal.
2, the mobile terminal signal receives: with reference to figure 2, the mobile terminal is that bullet train receives this radiofrequency signal after mobile terminal CPE handles by antenna, described mobile terminal CPE is the client device of mobile terminal, here refer to mainly comprise demodulator, demodulate the broadband IP digital signal by mobile terminal CPE, also radiofrequency signal being carried out frequency difference before the demodulation proofreaies and correct, bearing calibration is identical with the disclosed technical scheme of addressing in the step 1 of patent formerly, the broadband IP digital signal is exported to little base station by each output of switch, each little base station is exported GSM more respectively, CDMA, WCDMA, the movable signal of standards such as TD-SCDMA, each movable signal realize that by cable or antenna signal covers on bullet train after mixer closes the road.
Aforementioned broadband IP can provide the RFDC of the highest 100M speed, when concrete operations, stiff end broadband IP digital signal is connected with control centre by optical fiber, and the mobile terminal is connected with each little base station by the IP switch, and little base station output mobile communication signal carries out the bullet train signal and covers.
Aforementioned field intensity covering method is suitable equally for the movable signal of standards such as GSMR, TATRE, CMMB and WI-FI.
Claims (2)
1. a field intensity covering method for high-speed moving object is characterized in that comprising the steps:
1) fixed end signal transmission: the broadband IP digital signal is modulated into radiofrequency signal, and the frequency of described radiofrequency signal is 100MHz～7GHz, according to moving body speed this radiofrequency signal is carried out launching by antenna after pre-frequency difference is handled;
2) the mobile terminal signal receives: the mobile terminal receives this radiofrequency signal by antenna and carries out multispectral reining in and demodulate the broadband IP digital signal after frequency difference is proofreaied and correct, the broadband IP digital signal is exported to each little base station respectively by each output of switch, exported the movable signal of various standards again by each little base station, each movable signal realizes that at moving body signal covers by cable or antenna after mixer closes the road.
2. field intensity covering method for high-speed moving object according to claim 1 is characterized in that: described movable signal is the movable signal of any one or multiple standard among GSM, CDMA, WCDMA, TD-SCDMA, GSMR, TATRE, CMMB and the WI-FI.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010004143A CN101801008A (en) | 2010-01-04 | 2010-01-04 | Field intensity covering method for high-speed moving object |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010004143A CN101801008A (en) | 2010-01-04 | 2010-01-04 | Field intensity covering method for high-speed moving object |
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| CN101801008A true CN101801008A (en) | 2010-08-11 |
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| CN201010004143A Pending CN101801008A (en) | 2010-01-04 | 2010-01-04 | Field intensity covering method for high-speed moving object |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958747A (en) * | 2010-09-25 | 2011-01-26 | 北京邮电大学 | Mobile communication system and method and wireless communication receiving-transmitting equipment in high-speed moving environment |
| CN103583079A (en) * | 2011-04-06 | 2014-02-12 | 诺基亚西门子通信公司 | Dual in-band/out-band radio access system field |
| CN110493822A (en) * | 2019-08-06 | 2019-11-22 | 京信通信系统（中国）有限公司 | Point-to-multipoint delivery device and system |
-
2010
- 2010-01-04 CN CN201010004143A patent/CN101801008A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958747A (en) * | 2010-09-25 | 2011-01-26 | 北京邮电大学 | Mobile communication system and method and wireless communication receiving-transmitting equipment in high-speed moving environment |
| CN103583079A (en) * | 2011-04-06 | 2014-02-12 | 诺基亚西门子通信公司 | Dual in-band/out-band radio access system field |
| CN103583079B (en) * | 2011-04-06 | 2017-12-19 | 诺基亚通信公司 | In dual band/with outer radio access method, equipment and system |
| CN110493822A (en) * | 2019-08-06 | 2019-11-22 | 京信通信系统（中国）有限公司 | Point-to-multipoint delivery device and system |
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Application publication date: 20100811 |