CN101719771A - Frequency deviation processing method and system and repeater - Google Patents
Frequency deviation processing method and system and repeater Download PDFInfo
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- CN101719771A CN101719771A CN 200910246515 CN200910246515A CN101719771A CN 101719771 A CN101719771 A CN 101719771A CN 200910246515 CN200910246515 CN 200910246515 CN 200910246515 A CN200910246515 A CN 200910246515A CN 101719771 A CN101719771 A CN 101719771A
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Abstract
The embodiment of the invention provides a frequency deviation processing method and a system and a repeater; the frequency deviation processing method comprises the following steps: a navigation signal is received, and the current moving position and the moving speed of a mobile station can be obtained according to the navigation signal; frequency deviation value of an interactive signal between a base station and the mobile station is obtained according to the current moving position, moving speed and the corresponding relation of the stored moving route in-line position and a serving base station position; frequency deviation correction treatment is carried out to the interactive signal between the base station and the mobile station according to the frequency deviation value. In the embodiment of the invention, the repeater on mobile equipment is adopted to calculate the frequency deviation value of the interactive signal between the base station and the mobile station, so as to eliminate the effect of doppler effect on the interactive signal between the base station and the mobile station according to the navigation signal according to the frequency deviation value and improve the communication quality.
Description
Technical field
The embodiment of the invention relates to communication technical field, relates in particular to a kind of frequency deviation processing method and system and repeater.
Background technology
Along with the continuous development of mobile communication technology, the railway soverlay technique is also fast-developing thereupon.The GSM railway covers can provide communication service for the travelling carriage on the train.Along with the continuous development of railway cause, bullet train substitutes conventional train gradually.The speed of service of bullet train is higher, and therefore, the base station of the travelling carriage of bullet train inside and bullet train outside communicates alternately, can cause the generation of doppler shift effect, thereby the frequency that causes signal is offset.
In the prior art, in order to overcome the signal frequency deviation that Doppler effect causes, the base station can adopt frequency compensated method frequency to received signal to carry out treatment for correcting behind the signal that receives the travelling carriage transmission; Travelling carriage also needs to adopt frequency compensated method frequency to received signal to carry out treatment for correcting behind the signal that receives the base station transmission.
Yet because the ability that different mobile stations is proofreaied and correct signal frequency deviation exists than big-difference, for carrying out frequency compensated travelling carriage, Doppler effect can cause the quality of signal of communication to descend.
Summary of the invention
The embodiment of the invention provides a kind of frequency deviation processing method and system and repeater.
The embodiment of the invention provides a kind of frequency deviation processing method, comprising:
Receive navigation signal, obtain current shift position of travelling carriage and translational speed according to described navigation signal;
According to the mobile path-along position of described current shift position, translational speed and storage and the corresponding relation of serving BS position, obtain the frequency deviation value of the interactive signal between base station and the described travelling carriage;
According to described frequency deviation value the interactive signal between described base station and the travelling carriage being carried out frequency offset correction handles.
The embodiment of the invention provides a kind of repeater, comprising:
Receiving processing module is used to receive navigation signal, obtains current shift position of mobile device and translational speed according to described navigation signal;
Acquisition module is used for obtaining the frequency deviation value of the interactive signal between base station and the described travelling carriage according to the mobile path-along position of described current shift position, translational speed and storage and the corresponding relation of serving BS position;
The treatment for correcting module, the frequency deviation value that is used for obtaining according to described acquisition module carries out signal to the interactive signal between described base station and the travelling carriage and carries out the frequency offset correction processing.
The embodiment of the invention provides a kind of frequency offset processing system, comprise: base station and above-mentioned repeater, described base station, be used for sending downstream signal to travelling carriage by described repeater, receive the upward signal that described travelling carriage sends by described repeater, described repeater is carried out sending to after frequency offset correction is handled travelling carriage or described repeater to described downstream signal and described upward signal is carried out frequency offset correction is handled and send to described base station.
The embodiment of the invention, adopt the repeater to receive navigation information, thereby can obtain current shift position of mobile device and mobile velocity information, obtain frequency deviation value according to the mobile path-along position of storage in advance and the corresponding relation of serving BS position, and then adjust the frequency deviation of the interactive signal between base station and the travelling carriage according to this frequency deviation value, the upward signal that makes the repeater be transmitted to the downstream signal of travelling carriage or send to the base station is a signal of having eliminated Doppler effect, eliminated the influence of Doppler effect, improved communication quality interactive signal between base station and the travelling carriage.And, present embodiment need not travelling carriage and carries out frequency deviation adjustment processing, therefore the ability that travelling carriage is carried out frequency offset processing has no requirement, thereby make any travelling carriage all can not be subjected to the influence of Doppler effect, do not need the base station to have the frequency offset processing function yet, thereby reduced the complicated operation degree of base station.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of an embodiment of frequency deviation processing method of the present invention;
Fig. 2 is the flow chart of another embodiment of frequency deviation processing method of the present invention;
Fig. 3 is the structural representation of the embodiment in repeater of the present invention;
Fig. 4 is the structural representation of another embodiment of repeater of the present invention;
Fig. 5 is the structural representation of a frequency offset processing embodiment of system of the present invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Fig. 1 is the flow chart of an embodiment of frequency deviation processing method of the present invention, and the method for present embodiment can be carried out by any repeater that can receive navigation signal, and as shown in Figure 1, the method for present embodiment can comprise:
101, receive navigation signal, obtain current shift position of travelling carriage and translational speed according to described navigation signal;
With the high-speed mobile scene is example, and for example the automobile of the train of high-speed mobile, high-speed mobile etc. can carry out enhancement process to the signal of communication that penetrates car body in the inner repeater of installing of car body.The repeater belongs to multiplying arrangement frequently, be a kind of in the wireless communication transmissions process radio transmission transferring equipment of enhancing signal.
In the present embodiment, the repeater can be known position and the translational speed information of self according to the navigation signal that receives, and also is relevant locating information such as the current shift position of travelling carriage and translational speed.For instance, travelling carriage obtain translational speed a kind of implementation can for, in a period of time, travelling carriage can obtain the latitude and longitude information at start time point place according to navigation signal, obtaining the latitude and longitude information of termination time point again, can obtain longitude and latitude poor of shift position in a period of time then, also is the distance that travelling carriage moved in a period of time, with the length of this distance, promptly can obtain the translational speed of travelling carriage divided by this section period.This navigation signal can adopt existing any locate mode to obtain, and repeats no more.
In addition, in the present embodiment, can also store the corresponding relation of mobile path-along position and serving BS position in this repeater in advance, so that follow-uply determine frequency deviation value according to shift position, translational speed and this base station location.
102,, obtain the frequency deviation value of the interactive signal between base station and the travelling carriage according to the corresponding relation of the mobile path-along position and the serving BS position of current shift position, translational speed and storage;
It will be appreciated by persons skilled in the art that according to different base stations and lay that place, shift position at a time has a base station and covers, and also has a plurality of base stations and covers, for travelling carriage provides service.
The repeater can obtain the position of base station from the corresponding relation of storing mobile path-along position and serving BS position in advance, the repeater can be according to current shift position then, and translational speed and the base station location that obtains obtain the frequency deviation value of the interactive signal between this travelling carriage and the base station.Interactive signal between travelling carriage and the base station can comprise that the base station sends to the signal of travelling carriage (downstream signal), travelling carriage sends to signal of base station (upward signal).
For instance, the repeater can be according to the coordinate figure of current shift position, finds the position with the corresponding serving BS of this coordinate from the corresponding relation of the mobile path-along position of storage in advance and serving BS position.Need to prove that if the installation position of base station changes when having new base station to lay in other words, the mobile path-along position that this is stored in advance and the corresponding relation of serving BS position can upgrade in time.
103, according to frequency deviation value the interactive signal between base station and the travelling carriage being carried out frequency offset correction handles.The repeater can be adopted this frequency deviation value that the interactive signal between base station and the travelling carriage is carried out frequency offset correction and handle after being got access to this frequency deviation value.
Particularly, present embodiment can adopt automatic frequency control (Automatic Frequency Control, hereinafter to be referred as: AFC) method is carried out frequency offset correction to the interactive signal between base station and the travelling carriage and is handled.The AFC method is to make output signal frequency and given frequency keep determining a kind of autocontrol method of relation, realizes that the circuit of AFC mainly is made of parts such as frequency discriminator and controlled local oscillators.Controlled local oscillator adopts voltage controlled oscillator more.The effect of frequency discriminator is the frequency deviation that detects intermediate frequency, and output error voltage.During closed loop, output error voltage departs from the frequency of oscillation of controlled oscillator to reduce, thereby intermediate frequency is pulled to rated value.This frequency negative feedback reaches poised state at last through adjustings that circulate repeatedly of AFC circuit, thus make operating frequency keep stablizing and deviation very little.Therefore, present embodiment can be applied in the frequency deviation value that obtains in the process of this AFC, thereby proofreaies and correct the frequency shift (FS) of the interactive signal between base station and the travelling carriage.
Need to prove that those skilled in the art also can adopt other method to carry out frequency offset correction and handle, present embodiment does not limit.
For instance, suppose in current shift position, there are two base stations to provide service for travelling carriage, then the repeater can receive the downstream signal that two base stations send, the base station can adopt above-mentioned frequency deviation value that the downstream signal of two base stations transmissions is carried out the frequency offset correction processing respectively then, for example adds this frequency deviation value on the basis of given frequency.Handle the frequency shift (FS) to eliminate the downstream signal that Doppler effect causes by frequency offset correction.The repeater can send to travelling carriage respectively with the downstream signal after handling through frequency offset correction, thereby makes that travelling carriage need not frequency shift (FS) to be handled again, and the frequency deviation processing method of the visible embodiment of the invention has no requirement to the ability of travelling carriage.
In the present embodiment, can there be a reception antenna repeater, also a plurality of reception antennas can be arranged.As a reception antenna, when receiving the downstream signal of a plurality of base stations transmission, because it is possible different that the distance of base station and repeater or repeater receive signal of base station intensity, at this moment, can select the downstream signal of bigger downstream signal of signal strength signal intensity or nearest base station to carry out frequency offset correction handles.When a plurality of reception antenna, can each signal of base station be distinguished with different directed donor antennas according to signal of base station intensity difference and receive, and carry out frequency offset correction respectively and handle.
In addition, the repeater also can receiving mobile sends to the upward signal of base station, and this upward signal is carried out being transmitted to the base station after frequency offset correction is handled, and handles thereby make the base station need not again this upward signal to be carried out frequency offset correction.
Need to prove, present embodiment is that example is illustrated with two base stations, it will be understood by those skilled in the art that, all can carry out above-mentioned frequency offset correction for each base station in a base station or the plural base station and the interactive signal between the travelling carriage and handle, thereby make the base station send to the influence that the downstream signal of travelling carriage or upward signal that the repeater sends to the base station are not subjected to Doppler effect.
In addition, the method for present embodiment only is not applicable to the high-speed mobile scene, and other exist under the scene of frequency deviation and also can be suitable for.And the method for the embodiment of the invention goes for plurality of communication systems, global system for mobile communications (Global System for Mobile Communications for example, hereinafter to be referred as: GSM), code division multiple access (Code-Division Multiple Access, hereinafter to be referred as: CDMA), Long Term Evolution (Long Term Evolution, hereinafter to be referred as: LTE) or the like.
The frequency deviation processing method of present embodiment, the navigation information that utilization receives can obtain current shift position of travelling carriage and mobile velocity information, obtain frequency deviation value according to the mobile path-along position of storage in advance and the corresponding relation of serving BS position, and then adjust the frequency deviation of the interactive signal between base station and the travelling carriage according to this frequency deviation value, the upward signal that makes the repeater be transmitted to the downstream signal of travelling carriage or send to the base station is a signal of having eliminated Doppler effect, eliminated the influence of Doppler effect, improved communication quality interactive signal between base station and the travelling carriage.And, present embodiment need not travelling carriage and carries out frequency deviation adjustment processing, therefore the ability that travelling carriage is carried out frequency offset processing has no requirement, thereby make any travelling carriage all can not be subjected to the influence of Doppler effect, do not need the base station to have the frequency offset processing function yet, thereby reduced the complicated operation degree of base station.
Fig. 2 is the flow chart of another embodiment of frequency deviation processing method of the present invention, and as shown in Figure 2, the method for present embodiment can comprise:
201, receive navigation signal, obtain current shift position of mobile device and translational speed according to described navigation signal.
In the step 201, the navigation signal of reception can be the navigation signal that is sent by various satellite navigation systems, and the embodiment of the invention does not limit.The locating information that current shift position and translational speed etc. are relevant can be known according to the navigation signal that receives in the repeater.In addition, this repeater can also be stored the corresponding relation of mobile path-along position and serving BS position in advance.
202,, obtain the frequency deviation value of the downstream signal of base station transmission according to the mobile path-along position of shift position, translational speed and the storage of obtaining and the corresponding relation of serving BS position;
Wherein, can obtain frequency deviation value in the following manner:
From the corresponding relation of the mobile path-along position of described storage and serving BS position, obtain the base station location corresponding with the base station;
Determine line between shift position and the base station location and the angle between the translational speed; This translational speed is a vector, can comprise rate travel and moving direction information.
Can obtain the corresponding frequency deviation value of interactive signal between travelling carriage and the base station in the following manner,
Wherein, f
dBe frequency deviation value, f
cBe carrier frequency, C is a propagation velocity of electromagnetic wave, and v is the travelling carriage current movement speed, and θ is described angle.
Specifically, supposing has two in current location for travelling carriage provides serving base station, and there are two base stations, base station 1 and base station 2 in promptly current place, shift position.Then the positional information of this base station 1 and base station 2 can be extracted in the repeater from the corresponding relation of the mobile path-along position of its storage and serving BS position.For instance, this leaching process can for: the repeater is according to the coordinate figure of current shift position, to know current be base station 1 and base station 2 for travelling carriage provides serving base station in inquiry from the corresponding relation of mobile path-along position and the serving BS position of storage, thus the base station location of extraction base station 1 and base station 2.
According to the position and the current shift position of travelling carriage of the base station that obtains, the line between base station 1 and the current shift position of travelling carriage can be determined in the repeater, thereby can determine the angle between this line and the travelling carriage moving direction; Similarly, the line between the current shift position of base station 2 and travelling carriage also can be determined in the repeater, thereby determines the angle between this line and the travelling carriage moving direction.
Thereby, the frequency deviation value of the upward signal of the frequency deviation value of the upward signal that the repeater can application of formula (1) calculation base station 1, the frequency deviation value of downstream signal and base station 2, the frequency deviation value of downstream signal.
With the downstream signal is example, supposes that current movement speed is 350Km/H, and the angle of the direction of this translational speed and base station 1 is 180 degree, and with angle 30 degree of base station 2, then can to calculate frequency deviation value as follows in the repeater:
The frequency deviation value of the downstream signal of base station 1 :-292Hz; The frequency deviation value of the downstream signal of base station 2 :+253Hz.
Need to prove, in this computational process, carrier frequency can be taken as the median of the frequency range that operator has or distributes to and move the median that covers all frequencies of website along the line in the present embodiment, also can adopt empirical value, and those skilled in the art can select as required voluntarily.
For plural base station, each base station all can adopt above-mentioned processing mode to obtain the frequency deviation value of its corresponding upward signal and the frequency deviation value of downstream signal.
203, receive the downstream signal that described two base stations send accordingly by two directed donor antennas.
Generally, the antenna towards the base station is called donor antenna, and donor antenna is used for the link between base station and the repeater, generally adopts the very strong directional antenna of directivity.When if the base station of current covering is two or more base stations, when receiving downstream signal by directed donor antenna, both can adopt a directed donor antenna to receive the downstream signal that the base station sends, also can receive the downstream signal that each base station sends in two or more base stations accordingly by two or more directed donor antennas.
In the step 203, the repeater also can send upward signal to the base station by directed donor antenna.
It will be understood by those skilled in the art that, lay according to different base stations, place, shift position at a time has a base station and covers, also having a plurality of base stations covers, therefore, donor antenna in the present embodiment can be set to and provide serving base station the same number of number simultaneously, and present embodiment is that example describes with two only.
In addition, need to prove, can there be sequencing between the step 202 and 203, that is to say, in the present embodiment, the repeater both can have been calculated the frequency deviation value of upward signal or downstream signal earlier, and then the interactive signal that transmits between reception base station and the travelling carriage, also can receive the interactive signal that transmits between base station and the travelling carriage earlier, and then calculate and to be used for that this interactive signal is carried out frequency offset correction and to handle required frequency deviation value, can also finish in the lump finishing the frequency deviation value that calculates upward signal or downstream signal and receiving the interactive signal that transmits between base station and the travelling carriage.
204, the downstream signal that two base stations is sent according to the frequency deviation value of described downstream signal carries out frequency offset correction and handles.
In addition, the repeater is receiving travelling carriage when sending to the upward signal of base station, also can carry out frequency offset correction to this upward signal according to the frequency deviation value of upward signal and handle.
205, the downstream signal after the treatment for correcting is sent to travelling carriage.
Step 205 also can be that the upward signal of repeater after with treatment for correcting sends to the base station.
The repeater is after getting access to this frequency deviation value, the downstream signal that the frequency deviation value that can adopt downstream signal sends base station 1 and base station 2 carries out frequency offset correction respectively to be handled, and the upward signal that the frequency deviation value that also can adopt upward signal sends to the base station to travelling carriage carries out frequency offset correction to be handled.This frequency offset correction is handled can adopt existing techniques in realizing, for example adopts the AFC method, repeats no more herein.
The base station that the method for present embodiment can compatible have the base station of frequency offset correction function and not have the frequency offset correction function.
The frequency deviation processing method of present embodiment, adopt the repeater to receive navigation information, thereby can obtain current shift position of travelling carriage and mobile velocity information, obtain the frequency deviation value of upward signal or the frequency deviation value of downstream signal according to the mobile path-along position of storage in advance and the corresponding relation of serving BS position, and then adjust the frequency deviation that the base station sends to the downstream signal of travelling carriage according to the frequency deviation value of this downstream signal, frequency deviation value according to upward signal is adjusted the frequency deviation that travelling carriage sends to the upward signal of base station, the upward signal that makes the repeater be transmitted to the downstream signal of travelling carriage and be transmitted to the base station is the signal of having eliminated Doppler effect, thereby eliminated the influence of Doppler effect, improved communication quality the signal of communication between travelling carriage and the base station.And present embodiment need not travelling carriage and base station to carry out the frequency deviation adjustment and handles, and therefore the ability that frequency offset processing is carried out in travelling carriage and base station has no requirement, thereby makes any travelling carriage and base station all can not be subjected to the influence of Doppler effect.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
Fig. 3 is the structural representation of the embodiment in repeater of the present invention, as shown in Figure 3, the repeater of present embodiment can comprise: receiving processing module 11, acquisition module 12 and treatment for correcting module 13, wherein, receiving processing module 11 is used to receive navigation signal, obtains current shift position of mobile device and translational speed according to described navigation signal; Acquisition module 12 is used for the corresponding relation according to the mobile path-along position and the serving BS position of current shift position, translational speed and storage, obtains the frequency deviation value of the interactive signal between base station and the travelling carriage; The frequency deviation value that treatment for correcting module 13 is used for obtaining according to acquisition module 12 carries out frequency offset correction to the interactive signal between described base station and the travelling carriage to be handled.
The realization principle of the repeater of present embodiment and method embodiment shown in Figure 1 is basic identical, repeats no more.Need to prove that the module of the repeater in the present embodiment can merge, also can further split.
The repeater of present embodiment can receive navigation information, thereby can obtain current shift position of mobile device and mobile velocity information, obtain frequency deviation value according to the mobile path-along position of storage in advance and the corresponding relation of serving BS position, and then adjust the frequency deviation of the interactive signal between base station and the travelling carriage according to this frequency deviation value, the upward signal that makes the repeater be transmitted to the downstream signal of travelling carriage or send to the base station is a signal of having eliminated Doppler effect, eliminated the influence of Doppler effect, improved communication quality interactive signal between base station and the travelling carriage.And, present embodiment need not travelling carriage and carries out frequency deviation adjustment processing, therefore the ability that travelling carriage is carried out frequency offset processing has no requirement, thereby make any travelling carriage all can not be subjected to the influence of Doppler effect, do not need the base station to have the frequency offset processing function yet, thereby reduced the complicated operation degree of base station.
Fig. 4 is the structural representation of another embodiment of repeater of the present invention, as shown in Figure 4, the repeater of present embodiment is on the basis of repeater shown in Figure 3, further, also comprise sending module 14, this sending module 14 is used for the signal that correction processing module 13 is carried out after frequency offset correction is handled is sent to described base station or travelling carriage.Acquisition module 12 specifically is used for the corresponding relation according to the mobile path-along position and the serving BS position of described shift position, translational speed and storage, obtains the frequency deviation value of the downstream signal of described base station transmission; Treatment for correcting module 13 specifically is used for carrying out frequency offset correction according to the downstream signal that the frequency deviation value of described downstream signal sends described base station and handles.Perhaps acquisition module 12 specifically is used for the corresponding relation according to the mobile path-along position and the serving BS position of described shift position, translational speed and storage, obtains the frequency deviation value of the upward signal that sends to the base station; Treatment for correcting module 13 specifically is used for according to the frequency deviation value of described upward signal the upward signal that sends to the base station being carried out the frequency offset correction processing.
Further, receiving processing module 11 can comprise: receiving element 111 and processing unit 112, acquisition module 12 comprises extraction unit 121, determining unit 122 and computing unit 123, wherein, receiving element 111 is used to receive navigation signal, and processing unit 112 is used for obtaining current shift position of travelling carriage and translational speed according to the navigation signal that receiving element 111 receives; Extraction unit 121 is used for obtaining the base station location corresponding with current shift position from the mobile path-along position of described storage with the corresponding relation of serving BS position; Determining unit 122 is used for determining current movement speed according to the current shift position that extraction unit 121 obtains, and determines current shift position and line between the base station location and the angle between the current movement speed; Computing unit 123 is used for calculating in the following manner and obtains the frequency deviation value corresponding with described base station,
Wherein, f
dBe frequency deviation value, f
cBe carrier frequency, C is a propagation velocity of electromagnetic wave, and v is the travelling carriage current movement speed, and θ is described angle.
The realization principle of the repeater of present embodiment and method embodiment shown in Figure 2 is basic identical, repeats no more.
The repeater of present embodiment can receive navigation information, thereby can obtain current shift position of travelling carriage and mobile velocity information, obtain the frequency deviation value of upward signal or the frequency deviation value of downstream signal according to the mobile path-along position of storage in advance and the corresponding relation of serving BS position, and then adjust the frequency deviation that the base station sends to the downstream signal of travelling carriage according to the frequency deviation value of this downstream signal, frequency deviation value according to upward signal is adjusted the frequency deviation that travelling carriage sends to the upward signal of base station, the upward signal that makes the repeater be transmitted to the downstream signal of travelling carriage and be transmitted to the base station is the signal of having eliminated Doppler effect, thereby eliminated the influence of Doppler effect, improved communication quality the signal of communication between travelling carriage and the base station.And present embodiment need not travelling carriage and base station to carry out the frequency deviation adjustment and handles, and therefore the ability that frequency offset processing is carried out in travelling carriage and base station has no requirement, thereby makes any travelling carriage and base station all can not be subjected to the influence of Doppler effect.
Fig. 5 is the structural representation of a frequency offset processing embodiment of system of the present invention, as shown in Figure 5, the system of present embodiment can comprise: repeater 1 and base station 2 (Fig. 5 only shows 3 base stations), wherein base station 2 is used for sending downstream signal by repeater 1 to travelling carriage, receive the upward signal that described travelling carriage sends by described repeater 1, the 1 pair of downstream signal in repeater carries out sending to after frequency offset correction is handled 1 pair of upward signal of travelling carriage or repeater and carries out frequency offset correction and handle and send to base station 2.
The structure shown in Fig. 3 or 4 can be adopted in repeater 1 in the present embodiment, and it realizes that principle can adopt the method embodiment shown in Fig. 1 or 2, repeats no more.
In the system of present embodiment, the repeater can receive navigation information, thereby can obtain current shift position of travelling carriage and mobile velocity information, obtain the frequency deviation value of upward signal or the frequency deviation value of downstream signal according to the mobile path-along position of storage in advance and the corresponding relation of serving BS position, and then adjust the frequency deviation that the base station sends to the downstream signal of travelling carriage according to the frequency deviation value of this downstream signal, frequency deviation value according to upward signal is adjusted the frequency deviation that travelling carriage sends to the upward signal of base station, the upward signal that makes the repeater be transmitted to the downstream signal of travelling carriage and be transmitted to the base station is the signal of having eliminated Doppler effect, thereby eliminated the influence of Doppler effect, improved communication quality the signal of communication between travelling carriage and the base station.And present embodiment need not travelling carriage and base station to carry out the frequency deviation adjustment and handles, and therefore the ability that frequency offset processing is carried out in travelling carriage and base station has no requirement, thereby makes any travelling carriage and base station all can not be subjected to the influence of Doppler effect.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (11)
1. a frequency deviation processing method is characterized in that, comprising:
Receive navigation signal, obtain current shift position of travelling carriage and translational speed according to described navigation signal;
According to the mobile path-along position of described current shift position, translational speed and storage and the corresponding relation of serving BS position, obtain the frequency deviation value of the interactive signal between base station and the described travelling carriage;
According to described frequency deviation value the interactive signal between described base station and the travelling carriage being carried out frequency offset correction handles.
2. frequency deviation processing method according to claim 1, it is characterized in that, described according to the mobile path-along position of described current shift position, translational speed and storage and the corresponding relation of serving BS position, obtain the frequency deviation value of the interactive signal between base station and the described travelling carriage, comprising:
According to the mobile path-along position of described current shift position, translational speed and storage and the corresponding relation of serving BS position, obtain the frequency deviation value of the downstream signal that described base station sends;
Describedly according to described frequency deviation value the interactive signal between described base station and the travelling carriage is carried out frequency offset correction and handles, comprising:
The downstream signal that described base station is sent according to the frequency deviation value of described downstream signal carries out frequency offset correction to be handled.
3. frequency deviation processing method according to claim 1, it is characterized in that, described according to the mobile path-along position of described current shift position, translational speed and storage and the corresponding relation of serving BS position, obtain the frequency deviation value of the interactive signal between base station and the described travelling carriage, comprising:
According to the mobile path-along position of described current shift position, translational speed and storage and the corresponding relation of serving BS position, obtain the frequency deviation value of the upward signal that sends to the base station;
Describedly according to described frequency deviation value the interactive signal between described base station and the travelling carriage is carried out frequency offset correction and handles, comprising:
Frequency deviation value according to described upward signal carries out the frequency offset correction processing to the upward signal that sends to the base station.
4. according to the described frequency deviation processing method of arbitrary claim in the claim 1～3, it is characterized in that, described according to the mobile path-along position of described current shift position, translational speed and storage and the corresponding relation of serving BS position, obtain the frequency deviation value of the interactive signal between base station and the described travelling carriage, comprising:
From the corresponding relation of the mobile path-along position of described storage and serving BS position, obtain and the described current corresponding base station location in shift position;
Determine current movement speed according to described current shift position;
Determine described current shift position and line between the described base station location and the angle between the described current movement speed;
Obtain the frequency deviation value corresponding in the following manner with described base station:
Wherein, f
dBe frequency deviation value, f
cBe carrier frequency, C is a propagation velocity of electromagnetic wave, and v is the travelling carriage current movement speed, and θ is described angle.
5. frequency deviation processing method according to claim 4 is characterized in that, describedly determines current movement speed according to described current shift position, comprising:
Obtain the latitude and longitude information of described current shift position;
Obtain latitude and longitude information poor of the latitude and longitude information of described current shift position and the shift position before a period of time;
Use the difference of this latitude and longitude information divided by the length of this section period, obtain the travelling carriage current movement speed.
6. a repeater is characterized in that, comprising:
Receiving processing module is used to receive navigation signal, obtains current shift position of mobile device and translational speed according to described navigation signal;
Acquisition module is used for obtaining the frequency deviation value of the interactive signal between base station and the described travelling carriage according to the mobile path-along position of described current shift position, translational speed and storage and the corresponding relation of serving BS position;
The treatment for correcting module, the frequency deviation value that is used for obtaining according to described acquisition module carries out signal to the interactive signal between described base station and the travelling carriage and carries out the frequency offset correction processing.
7. repeater according to claim 6 is characterized in that described repeater also comprises sending module,
Described sending module is used for the signal that described treatment for correcting module is carried out after frequency offset correction is handled is sent to described base station or travelling carriage.
8. according to claim 6 or 7 described repeaters, it is characterized in that, described acquisition module obtains the frequency deviation value of the downstream signal of described base station transmission according to the corresponding relation of the mobile path-along position and the serving BS position of described shift position, translational speed and storage; The downstream signal that described treatment for correcting module sends described base station according to the frequency deviation value of described downstream signal carries out frequency offset correction to be handled.
9. according to claim 6 or 7 described repeaters, it is characterized in that, described acquisition module obtains the frequency deviation value of the upward signal that sends to the base station according to the mobile path-along position of described current shift position, translational speed and storage and the corresponding relation of serving BS position; Described treatment for correcting module is carried out the frequency offset correction processing according to the frequency deviation value of described upward signal to the upward signal that sends to the base station.
10. according to claim 6 or 7 described repeaters, it is characterized in that described receiving processing module comprises:
Receiving element is used to receive navigation signal;
Processing unit is used for obtaining current shift position of travelling carriage and translational speed according to the navigation signal that described receiving element receives;
Described acquisition module comprises:
Extraction unit is used for obtaining and the described current corresponding base station location in shift position with the corresponding relation of serving BS position from the mobile path-along position of described storage;
Determining unit is used for determining current movement speed according to the current shift position that described extraction unit obtains, and determines described current shift position and line between the described base station location and the angle between the described current movement speed;
Computing unit is used for obtaining in the following manner the frequency deviation value corresponding with described base station,
Wherein, f
dBe frequency deviation value, f
cBe carrier frequency, C is a propagation velocity of electromagnetic wave, and v is the travelling carriage current movement speed, and θ is described angle.
11. frequency offset processing system, it is characterized in that, comprise: base station and as the described repeater of arbitrary claim in the claim 6～10, described base station, be used for sending downstream signal to travelling carriage by described repeater, receive the upward signal that described travelling carriage sends by described repeater, described repeater is carried out sending to after frequency offset correction is handled travelling carriage or described repeater to described downstream signal and described upward signal is carried out frequency offset correction is handled and send to described base station.
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| CN102469469A (en) * | 2010-11-17 | 2012-05-23 | 深圳国人通信有限公司 | Vehicle-mounted double-channel correcting repeater |
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| CN108289068A (en) * | 2017-01-10 | 2018-07-17 | 大唐移动通信设备有限公司 | A kind of frequency bias compensation method and device |
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