CN102571165A - Method and movable repeater for realizing signal reception in high speed moving environment - Google Patents
Method and movable repeater for realizing signal reception in high speed moving environment Download PDFInfo
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- CN102571165A CN102571165A CN2010105872732A CN201010587273A CN102571165A CN 102571165 A CN102571165 A CN 102571165A CN 2010105872732 A CN2010105872732 A CN 2010105872732A CN 201010587273 A CN201010587273 A CN 201010587273A CN 102571165 A CN102571165 A CN 102571165A
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Abstract
The invention provides a method for realizing signal reception in a high speed moving environment. The method comprises the steps of carrying out initializing settings by setting symmetrical change of output frequencies of a first phase-locked loop and a second phase-locked loop, inputting a signal to a branch where the first phase-locked loop is located when Doppler frequency shift of the signal is negative and inputting the signal to another branch where the second phase-locked loop is located when Doppler frequency shift of the signal is positive; calculating Doppler frequency shift of the obtained cell signal, distinguishing and judging the signal according to the positive and negative situations of the Doppler frequency shift, inputting the signal to the branches where different phase-locked loops are located in different judging conditions, and controlling the gating of a corresponding branch to output the signals. By locking the signals of neighboring cells respectively, the method eliminates the Doppler frequency shift of the received signals, solves the problem of frequency difference in switching of neighboring cells and avoids the multipath effect of the signals.
Description
Technical field
The present invention relates generally to the signal reception technique of moving communicating field, relates in particular to reception technique and a kind of mobile repeater of mobile communication signal in a kind of high-speed mobile environment.
Background technology
Improving constantly of the vehicles speed of service, it is quick more convenient that people are gone on a journey, but brought a new difficult problem also for the signal reception of GSM in the high-speed mobile environment.High-speed mobile environment mainly is meant the land high-speed mobile environment, like high-speed railway, and covering scene such as highway.For mobile network's covering, the following speed environment of 150km/h is also not obvious to the influence of the network coverage, and the speed of domestic high-speed railway is 250km/h to 400km/h, is the main overlay area that needs solution.Under high-speed mobile environment, cover two the significant problems that mainly are faced with:
The one, Doppler frequency shift.Under the situation of high-speed mobile, the signal frequency of reception can produce bigger frequency displacement, abbreviates Doppler frequency shift as when user terminal (like mobile phone, mobile Internet access is originally), and its calculating publicity is:
The 2nd, switch the sub-district.User terminal carry out the sub-district need be when switching with self frequency by the current area frequency translation to the purpose cell frequency, just there is a frequency difference in this.And under high-speed mobile environment because the influence of Doppler frequency shift and base station geographic position; The opposite in sign of the front and back Doppler frequency shift value that the sub-district produced; The sub-district frequency difference is very big before and after making, causes the user terminal frequency to switch difficulty, thus handoff failure, or direct call drop.
Dedicated network construction is one of solution of optimizing the sub-district switching problem under the high velocity environment, but this scheme can't be tackled the signal reception deterioration that Doppler frequency shift causes.Revealing cable technology can overcome the above problems simultaneously, but cost is too high, is unfavorable for Project Realization, only is applicable to that short-range circuit covers or the tunnel covers.The method of mobile repeater provides and has solved the thinking that we face problem.The repeater belongs to the frequency multiplying arrangement, is meant in the wireless communication transmissions process, to play a kind of radio transmission transferring equipment that signal strengthens.The basic function of repeater is exactly a radiofrequency signal power intensifier.The repeater by donor antenna pickoff signals in existing overlay area,, is transmitted into the signal of filtering once more after power amplifier amplifies and treats the overlay area carrying out fabulous isolation with logical outer signal through band pass filter in down link.In the uplink path, the signal of the mobile subscriber terminal in the overlay area is transmitted into corresponding base station with same working method after by up amplification link processing, thereby reaches the signal transmission of base station and user terminal.
At present, the solution of mobile repeater extensively adopts in high velocity environment covers, and through mobile repeater is installed on the vehicles such as automobile or bullet train, repeater and user terminal is synchronized with the movement.Use the repeater signal handling capacity stronger, signal is estimated and proofreaied and correct, eliminate user terminal receives signal under the high-speed motion environment Doppler frequency shift than domestic consumer terminal.Simultaneously, will carry out inside by retransmitting antenna through the cell signal of overcorrect and cover, and can reach coverage effect preferably, and wireless signal avoids penetrating the loss that car body etc. brings.Nowadays, the mobile repeater technology is primarily aimed at the Doppler frequency shift problem and has provided different automatic frequency control (AFC) algorithms, and fast-changing big frequency displacement can better estimated and proofread and correct to expectation, thereby improve the systematic function under the high velocity environment; But this implementation algorithm is the simple enhancing Signal Processing ability to current area, is difficult to solve the frequency hopping of the sub-district, front and back that is faced when switching, and because purpose cell signal locking difficulty when switching, handover success rate is still not high, easily call drop.
Summary of the invention
The purpose of this invention is to provide signal acceptance method and the mobile repeater of implementing this method in the high-speed mobile environment; Solve the difficult problem of switching that user terminal causes owing to sub-district, front and back frequency difference in the high-speed mobile process, thereby improve the sub-district handover success rate.
In view of above purpose, technical scheme of the present invention is achieved in that
Realize the method that signal receives in a kind of high-speed mobile environment, comprise the steps:
A, carry out the initialization setting: the output frequency symmetry that first phase-locked loop and second phase-locked loop are set changes; And this signal is input to first phase-locked loop place branch road when Doppler frequency shift value when signal is set for negative value, when the Doppler frequency shift value of signal on the occasion of the time this signal be input to second phase-locked loop belong to branch road;
B, cell signal calculating Doppler frequency shift value to getting access to; Positive and negative difference according to the Doppler frequency shift value is distinguished judgement with signal; During correspondence different decision condition signal is input to different phase-locked loop place branch roads, and the corresponding branch road of control gating is exported signal.
Further, among the said step b, based on the positive and negative difference of Doppler frequency shift value signal is distinguished judgement, be input to different phaselocked loop place branch roads during corresponding different decision condition, and the corresponding branch road of control gating exports signal, concrete grammar does,
Doppler frequency shift value when signal
f d For on the occasion of; And during greater than first threshold value; Be that the reception frequency shift value that the signal of negative value is transferred to Set For Current is the phase-locked loop place branch road of negative value with frequency shift value respectively; With frequency shift value on the occasion of the signal reception frequency shift value that is transferred to Set For Current on the occasion of phase-locked loop place branch road, and two phase-locked loops places of control gating branch road;
Doppler frequency shift value when signal
f d For on the occasion of, and during smaller or equal to first threshold value, the reception frequency shift value that all signals is transferred to Set For Current on the occasion of phase-locked loop place branch road, and the reception frequency shift value of a control gating Set For Current be on the occasion of phase-locked loop belong to branch road;
Doppler frequency shift value when signal
f d Be negative value, and during more than or equal to second threshold value, the reception frequency shift value that all signals is transferred to Set For Current on the occasion of phase-locked loop place branch road, and the reception frequency shift value of a control selector switch gating Set For Current be on the occasion of phase-locked loop belong to branch road;
Frequency shift value when signal
f d Be negative value; And during less than second threshold value; Be provided with current reception frequency shift value on the occasion of phase-locked loop place branch road become that to receive frequency shift value be the branch road of negative value, and the phase-locked loop place branch road that current reception frequency shift value is set is negative value become receive frequency shift value on the occasion of branch road; Then respectively with frequency shift value on the occasion of signal be transferred to after being provided with the reception frequency shift value on the occasion of phase-locked loop place branch road; With frequency shift value is that the reception frequency shift value that the signal of negative value is transferred to after being provided with is the phase-locked loop place branch road of negative value, and two phase-locked loops places of control gating branch road.
Further; Said method further comprises: the output frequency of said first phase-locked loop carries out mixing with the signal that is input in the branch road of first phase-locked loop place; The output frequency of said second phase-locked loop carries out mixing, the Doppler frequency shift of erasure signal with the signal that is input in the branch road of second phase-locked loop place.
Concrete, said first threshold value be on the occasion of, said second threshold value is a negative value, these two threshold values are respectively applied for and judge whether to need to change that branch road is selected and signal transmits.
To achieve these goals; Of the present invention a kind of mobile repeater of implementing above-mentioned signal acceptance method is provided also; Comprise donor antenna, first duplexer, descending low noise amplifier, frequency-selecting unit, downlink power amplifier, second duplexer and retransmitting antenna; It is characterized in that; Said frequency-selecting unit is connected with downlink power amplifier with descending low noise amplifier respectively, is used for behind descending low noise amplifier reception signal, according to the positive and negative difference of Doppler frequency shift value signal being distinguished judgement; During correspondence different decision condition signal is input to the branch road that different phase-locked loops belongs to, and the corresponding branch road of control gating is input to downlink power amplifier with signal.
Concrete, said frequency-selecting unit comprises:
A monitoring subelement; Be used to analyze signal after the descending low-noise amplifier filtering; Positive and negative difference based on the Doppler frequency shift value of said signal is distinguished judgement with signal, during corresponding different decision condition signal is input to different phaselocked loop place branch roads, the routing of control selector switch;
Two frequency mixers; Be divided into first frequency mixer and second frequency mixer; Said first frequency mixer is connected with first phase-locked loop; Said second frequency mixer is connected with second phase-locked loop, and the frequency input signal that receives from the monitoring subelement that each frequency mixer is respectively applied for the place branch road carries out mixing with the output frequency of the phase-locked loop that links to each other, and eliminates Doppler frequency shift;
Two phase-locked loops are divided into first phase-locked loop and second phase-locked loop, are respectively applied for the signal of locking different frequency, and two phase-locked loops output frequency symmetry change;
A selector switch, the signal that two phase-locked loops is belonged to branch roads carries out routing.
Can be known by technique scheme: the present invention passes through locking front and back cell signal respectively, and by judging whether locking signal covers, has eliminated the Doppler frequency shift that receives signal; Frequency difference problem when switch the sub-district before and after having solved; Avoided the multipath effect of signal.
Description of drawings
Fig. 1 realizes the method flow diagram that signal receives in the high-speed mobile environment of the present invention.
Fig. 2 is the structured flowchart of mobile repeater of the present invention.
Fig. 3 is the structural representation of the frequency-selecting unit of mobile repeater of the present invention.
Fig. 4 is the flow chart of the signal processing of frequency-selecting of the present invention unit.
Fig. 5 is mobile repeater moving process of the present invention and sub-district coverage diagram.
Embodiment
To combine concrete accompanying drawing and specific embodiment that the present invention is done further description below.
Like Fig. 1 is to realize the method flow diagram that signal receives in the high-speed mobile environment of the present invention.Realize the method that signal receives in a kind of high-speed mobile environment; Comprise the steps: a, carry out the initialization setting: the output frequency symmetry that first phase-locked loop and second phase-locked loop are set changes; And this signal is input to first phase-locked loop place branch road when Doppler frequency shift value when signal is set for negative value, when the Doppler frequency shift value of signal on the occasion of the time this signal be input to second phase-locked loop belong to branch road; B, cell signal calculating Doppler frequency shift value to getting access to; Positive and negative difference according to the Doppler frequency shift value is distinguished judgement with signal; During correspondence different decision condition signal is input to different phase-locked loop place branch roads, and the corresponding branch road of control gating is exported signal.
The repeater that method of the present invention can be applicable in the high-speed mobile environment also can directly apply to portable terminals such as mobile phone.Problem when the present invention has solved effectively through the method for using two branch roads that the sub-district is switched; Promptly, first threshold value and second threshold value judge whether to need to change branch road selection and signal transmission through being set; And, solved the Doppler frequency shift problem through in two branch roads, the input signal of each branch road being carried out mixing with the output frequency of the phase-locked loop that is connected.
The structured flowchart of the mobile repeater of embodiment of the present invention signal acceptance method is seen Fig. 2.Because the processing of upward signal does not belong to emphasis of the present invention, so do not draw in the drawings, repeats no more at this yet.Mobile repeater of the present invention comprises donor antenna, first duplexer, descending low noise amplifier, frequency-selecting unit, downlink power amplifier, second duplexer and retransmitting antenna;
Said first duplexer is used for receiving descending input signal from donor antenna, and this signal is input to descending low noise amplifier;
Said descending low noise amplifier is used for receiving signal from first duplexer, and carries out low noise and amplify; Said frequency-selecting unit is connected with downlink power amplifier with descending low noise amplifier respectively, is used for from following
After the row low-noise amplifier received signal; Positive and negative difference according to the Doppler frequency shift value is distinguished judgement with signal; During correspondence different decision condition signal is input to the branch road that different phaselocked loops belongs to, and the corresponding branch road of control gating is input to downlink power amplifier with signal;
Said downlink power amplifier is used for receiving from the frequency-selecting unit signal, and after said signal amplified and close the road, is input to second duplexer;
Said second duplexer is used for behind power amplifier processing unit reception signal, sending to retransmitting antenna, so that alms giver's cell signal is retransmitted covering.
Wherein, the structural representation of frequency-selecting unit is seen Fig. 3.Said frequency-selecting unit comprises:
A monitoring subelement is used for signal after the analysis filtered, calculates the Doppler frequency shift value of said signal and is input to two different phaselocked loops place branch roads respectively based on the positive and negative difference of frequency shift value, transmits based on judged result control selector switch routing carrying out shunt;
Two frequency mixers; Be divided into first frequency mixer and second frequency mixer; Said first frequency mixer is connected with first phase-locked loop; Said second frequency mixer is connected with second phase-locked loop, and the frequency input signal that receives from the monitoring subelement that each frequency mixer is respectively applied for the place branch road carries out mixing with the output frequency of the phase-locked loop that links to each other, and eliminates Doppler frequency shift;
Two phase-locked loops: first phase-locked loop and second phase-locked loop, be respectively applied for the signal that locks the neighbor cell different frequency, and the centre frequency of two phase-locked loops and the variation of cell signal standard frequency symmetry;
Selector switch: transmission signals is carried out routing.
The flow chart of the signal processing of monitoring subelement is seen Fig. 4; After the repeater powers on; The monitoring subelement carries out initialization: the output frequency symmetry that first phase-locked loop and second phase-locked loop are set changes, and the original frequency that initialization is provided with first phase-locked loop and second phase-locked loop is the standard radio signal frequency
f 0 (can set) referring to the 3GPP consensus standard.And the initialization setting is input to first phase-locked loop place branch road with this signal during for negative value when the Doppler frequency shift value of signal, when the Doppler frequency shift value of signal on the occasion of the time this signal is input to second phase-locked loop place branch road.First phase-locked loop place branch road is meant monitoring subelement that first phase-locked loop is connected and the signal line between the selector switch, is connected with first frequency mixer in this signal line.Second phase-locked loop place branch road is meant monitoring subelement that second phase-locked loop is connected and the signal line between the selector switch, is connected with second frequency mixer in this signal line.
First phase-locked loop is two identical phase-locked loops with second phase-locked loop, and its locking frequency changes synchronously, and setpoint frequency changing value opposite in sign.Promptly the frequency when first pll lock does
f 0 -DfWhen (be signal frequency be changed to successively decrease), the frequency of second pll lock does
f 0 + Df(being that being changed to of signal frequency increases progressively), vice versa.
After initialization was accomplished, after cell signal was handled through the LNA big unit, the monitoring subelement was through calculating the Doppler frequency shift value to the input signal that obtains, and with result of calculation with threshold value be set compare, mainly divide following four kinds of situations:
Doppler frequency shift value when signal
f d For just, and greater than first threshold value, expression signal is from sub-district, the place ahead, and mobile repeater website far away (apart from base station, place, sub-district than the apogee) forwards sub-district moves.The monitoring subelement is according to the symbol of signal Doppler frequency shift value; Be that the reception frequency shift value that the signal of negative value is transferred to Set For Current is the phase-locked loop place branch road of negative value with frequency shift value respectively; With frequency shift value on the occasion of the signal reception frequency shift value that is transferred to Set For Current on the occasion of phase-locked loop place branch road, and two phase-locked loops places of control gating branch road;
Doppler frequency shift value when signal
f d For just, and smaller or equal to first threshold value, expression signal is from sub-district, the place ahead, and mobile repeater is in nearly website (apart from base station, place, sub-district than the perigee) and forwards moves the sub-district.At this moment; The monitoring subelement obtains the selector switch state through the selector switch sign, if the selector switch sign equals 0, representes that two tributary signals of present selector switch cover jointly; Then the reception frequency shift value of a control gating Set For Current be on the occasion of phase-locked loop place branch road, and change the selector switch sign and equal 1.If the selector switch sign equals 1; The reception frequency shift value of expression selector switch current gating Set For Current be on the occasion of phase-locked loop belong to branch road; Then monitor reception frequency shift value that subelement is transferred to Set For Current with all signals on the occasion of phase-locked loop place branch road, need not revise the selector switch value of statistical indicant.
Doppler frequency shift value when signal
f d For negative, and more than or equal to second threshold value, expression signal is from the sub-district, rear, and mobile repeater is in nearly website (belonging to the base station than the perigee apart from the sub-district) gradually away from the sub-district, rear.At this moment, the reception frequency shift value that all signals are transferred to Set For Current on the occasion of phase-locked loop place branch road, and the reception frequency shift value of a control selector switch gating Set For Current be on the occasion of phase-locked loop belong to branch road.
Doppler frequency shift value when signal
f d For negative, and less than the family status two limit values, expression signal is from the sub-district, rear, and mobile repeater is in website far away gradually away from the sub-district, rear.At this moment,, the monitoring subelement obtains the selector switch state through the selector switch sign.If the selector switch sign equals 1; Represent the current reception frequency shift value of a present selector switch gating on the occasion of phase-locked loop place branch road; Then be provided with current reception frequency shift value on the occasion of phase-locked loop place branch road become that to receive frequency shift value be the branch road of negative value; And the phase-locked loop that current reception frequency shift value is set is negative value place branch road become receive frequency shift value on the occasion of branch road, control two phase-locked loops places of gating branch road simultaneously, and change selector switch sign equals 0; The monitoring subelement is according to the symbol of Doppler frequency shift value, is the signal of the negative value phase-locked loop place branch road that to transmit current reception frequency shift value be negative value with frequency shift value, with frequency shift value on the occasion of signal be transferred to current reception frequency shift value on the occasion of phase-locked loop place branch road.If the selector switch sign equals 0; Represent present selector switch two phase-locked loop places of gating branch road; Then monitor the symbol of subelement according to frequency shift value; With frequency shift value is the signal of the negative value phase-locked loop place branch road that to transmit current reception frequency shift value be negative value, with frequency shift value on the occasion of signal be transferred to current reception frequency shift value on the occasion of phase-locked loop place branch road, need not revise the selector switch value of statistical indicant.
Embodiment
Some parameters have been quoted in explanation in the present embodiment for ease, and existing these parameters are sorted out explains like following table, so that follow-up understanding:
| The parameter title | Parameter declaration |
| f 0 | The standard frequency value of descending input signal can be referring to the 3GPP consensus standard |
| Df | The method for expressing of Doppler frequency shift in the description is the absolute value of actual Doppler frequency shift value, along with the change dynamic change of mobile status |
| f d | The Doppler frequency shift value of obtaining during monitoring subelement deal with data (on the occasion of or negative value) |
| Offset | Be first threshold value (on the occasion of), when mobile repeater gets into the near website in sub-district, the place ahead, trigger, be used for judging whether mobile repeater need change branch road and select to transmit with signal |
| Openset | Be second threshold value (negative value),, be used for judging whether mobile repeater need change branch road and select to transmit with signal when mobile repeater triggers during away from the near website in sub-district, rear |
| selection | The selector switch sign is the Boolean type parameter.Selection=0 representes current selector switch two phase-locked loops places of gating branch road simultaneously, selection=1 represent the current reception frequency shift value of a current selector switch gating on the occasion of phase-locked loop place branch road |
As shown in Figure 4, establish C1 and be user's initial position (because entire method is the circulation of a plurality of links, the difference of initial position does not impact system).At the C1 point; Owing to have only the covering of sub-district 1 signal this moment, not the Doppler frequency shift value be on the occasion of signal, sub-district 1 signal through the processing of low noise amplifying unit after; At first by the Doppler frequency shift value of monitoring the subunit computes input signal; Frequency shift value is negative value (expression signal is from the sub-district at mobile repeater rear), the Doppler frequency shift value and the second threshold value openset is compared again, and this frequency shift value is greater than openset; Then signal is transferred to original definition for receiving i.e. first phase-locked loop place branch road of phase-locked loop place branch road that frequency shift value is a negative value, this moment, the frequency of first pll lock did
f 0 -Df, i.e. sub-district 1 signal frequency.The second corresponding phase-locked loop is followed the tracks of less than cell signal, so follow first phase-locked loop change locking frequency does
f 0 + DfAt this moment, sub-district 1 is the alms giver sub-district of mobile repeater, and the user terminal under the coverage of repeater communicates through the Radio Link of foundation with sub-district 1.
When user terminal moves to the C2 position, be sub-district 1 and 2 common overlay areas, sub-district.Because the covering radius of sub-district is far longer than the vertical range of sub-district to user's motion track (highway, railway) usually, this moment, angle was very little, can be similar to and think to be zero.Again because Doppler shift formula and horizontal range are irrelevant, so sub-district 1 and the Doppler frequency shift value big I approximately equal of sub-district 2 for the mobile repeater downstream signal, opposite in sign.Monitor this moment the symbol decision of subelement through frequency shift value with the signal of sub-district 2 be transferred to receive frequency shift value on the occasion of i.e. second phase-locked loop place branch road of phase-locked loop place branch road, and the locking frequency of second phase-locked loop is
f 0 + Df, just in time lock the signal of sub-district 2, downwards through covering after the mixing.Because be that two tributary signals cover downwards simultaneously, user terminal can search the signal of two sub-districts.Along with the continuation of user terminal is moved; The signal strength signal intensity of sub-district 1 more and more a little less than, the signal strength signal intensity of sub-district 2 is more and more stronger, when satisfying the switching condition of 3GPP agreement; User terminal will switch to sub-district 2 voluntarily by sub-district 1, thereby solve the frequency difference problem that high-speed mobile environment switches down.
?[0031]?
When user terminal moves to the C3 position, broken away from the coverage of sub-district 1, this moment a mobile repeater coverage cell 2 signals, the operating frequency of second phase-locked loop does
f 0 + Df, the first corresponding phase-locked loop is followed the tracks of less than cell signal, so follow second phase-locked loop change locking frequency does
f 0 -DfThis moment is more and more nearer from the base station of sub-district 2, and angle is increasing, and Doppler frequency shift is corresponding to be reduced.The Doppler frequency shift of judging signal when the monitoring subelement is during greater than the first threshold value offset (the offset value can be passed through actual test optimization); With a control selector switch selective reception frequency shift value on the occasion of phase-locked loop place branch road and second phase-locked loop place branch road signal is exported; And stop the signal of the opposite in sign of frequency shift value is transmitted along separate routes, change branch road co-transmitted at second phase-locked loop place.Thereby when avoiding Doppler frequency shift very little, the monitoring subelement also can lock sub-district 2 signals to frequency shift value symbol decision difficulty and first phase-locked loop and the multipath effect that causes simultaneously.
When the user continues to move, 2 of sub-districts become the sub-district, rear by sub-district, the place ahead, and the Doppler frequency shift value of sub-district 2 signals is by on the occasion of becoming negative value.Simultaneously, the locking frequency of second phase-locked loop also by
f 0 + DfBecome
f 0 -DfAt this moment, because first phase-locked loop place tributary signal is opened circuit by selector switch, the locking frequency correspondence that the locking frequency of first phase-locked loop is followed second phase-locked loop becomes
f 0 + Df, be used to search for next cell signal.
When user terminal had moved to the C4 position, gradually away from sub-district 2, it is big that the Doppler frequency shift value becomes, and second phase-locked loop continues tracking lock sub-district 2 signals.When continuing to move; When the judgement of monitoring subelement obtains the Doppler frequency shift value more than or equal to the second threshold value openset (the openset value can be passed through actual test optimization); Restart the symbol various signals of frequency shift value is transmitted respectively; Be provided with this moment current reception frequency shift value on the occasion of phase-locked loop place branch road (second phase-locked loop place branch road) become that to receive frequency shift value be the branch road of negative value; And the phase-locked loop that current reception frequency shift value is set is negative value place branch road (the first phase-locked loop branch road) become receive frequency shift value on the occasion of branch road; The signal (be the signal of sub-district 2 here) that is about to frequency shift value and is negative value is transferred to second phase-locked loop place branch road, and with frequency shift value on the occasion of signal (signal of the next sub-district that is about to search) be transferred to first phase-locked loop and belong to branch road.Simultaneously, monitoring subelement control selector switch is gating two phase-locked loops place branch road simultaneously, switches for next sub-district and prepares.
The user continues to move then, and the repeater course of work begins circulation by the C1 point.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (10)
1. realize the method that signal receives in the high-speed mobile environment, it is characterized in that, comprise the steps:
A, carry out the initialization setting: the output frequency symmetry that first phase-locked loop and second phase-locked loop are set changes; And this signal is input to first phase-locked loop place branch road when Doppler frequency shift value when signal is set for negative value, when the Doppler frequency shift value of signal on the occasion of the time this signal be input to second phase-locked loop belong to branch road;
B, cell signal calculating Doppler frequency shift value to getting access to; Positive and negative difference according to the Doppler frequency shift value is distinguished judgement with signal; During correspondence different decision condition signal is input to different phase-locked loop place branch roads, and the corresponding branch road of control gating is exported signal.
2. according to realizing the method that signal receives in the said high-speed mobile environment of claim 1; It is characterized in that, among the said step b, signal is distinguished judgement according to the positive and negative difference of Doppler frequency shift value; Be input to different phase-locked loop place branch roads during correspondence different decision condition; And control the corresponding branch road of gating signal is exported, concrete grammar does
Doppler frequency shift value when signal
f d For on the occasion of; And during greater than first threshold value; Be that the reception frequency shift value that the signal of negative value is transferred to Set For Current is the phase-locked loop place branch road of negative value with frequency shift value respectively; With frequency shift value on the occasion of the signal reception frequency shift value that is transferred to Set For Current on the occasion of phase-locked loop place branch road, and two phase-locked loops places of control gating branch road;
Doppler frequency shift value when signal
f d For on the occasion of, and during smaller or equal to first threshold value, the reception frequency shift value that all signals is transferred to Set For Current on the occasion of phase-locked loop place branch road, and the reception frequency shift value of a control gating Set For Current be on the occasion of phase-locked loop belong to branch road;
Doppler frequency shift value when signal
f d Be negative value, and during more than or equal to second threshold value, the reception frequency shift value that all signals is transferred to Set For Current on the occasion of phase-locked loop place branch road, and the reception frequency shift value of a control selector switch gating Set For Current be on the occasion of phase-locked loop belong to branch road;
Frequency shift value when signal
f d Be negative value; And during less than second threshold value; Be provided with current reception frequency shift value on the occasion of phase-locked loop place branch road become that to receive frequency shift value be the branch road of negative value, and the phase-locked loop place branch road that current reception frequency shift value is set is negative value become receive frequency shift value on the occasion of branch road; Then respectively with frequency shift value on the occasion of signal be transferred to after being provided with the reception frequency shift value on the occasion of phase-locked loop place branch road; With frequency shift value is that the reception frequency shift value that the signal of negative value is transferred to after being provided with is the phase-locked loop place branch road of negative value, and two phase-locked loops places of control gating branch road.
3. according to realizing the method that signal receives in claim 1 or the 2 said high-speed mobile environments; It is characterized in that; Said method further comprises: the output frequency of said first phase-locked loop carries out mixing with the signal that is input in the branch road of first phase-locked loop place; The output frequency of said second phase-locked loop carries out mixing, the Doppler frequency shift of erasure signal with the signal that is input in the branch road of second phase-locked loop place.
4. according to realizing the method that signal receives in claim 1 or the 2 said high-speed mobile environments; It is characterized in that; Said first threshold value be on the occasion of, said second threshold value is a negative value, these two threshold values are respectively applied for and judge whether need to change branch road and select to transmit with signal.
5. mobile repeater; Comprise donor antenna, first duplexer, descending low noise amplifier, frequency-selecting unit, downlink power amplifier, second duplexer and retransmitting antenna; It is characterized in that; Said frequency-selecting unit is connected with downlink power amplifier with descending low noise amplifier respectively, is used for behind descending low noise amplifier reception signal, according to the positive and negative difference of Doppler frequency shift value signal being distinguished judgement; During correspondence different decision condition signal is input to the branch road that different phase-locked loops belongs to, and the corresponding branch road of control gating is input to downlink power amplifier with signal.
6. according to the said mobile repeater of claim 5, it is characterized in that said frequency-selecting unit comprises:
A monitoring subelement; Be used to analyze signal after the descending low-noise amplifier filtering; Positive and negative difference based on the Doppler frequency shift value of said signal is distinguished judgement with signal, during corresponding different decision condition signal is input to different phaselocked loop place branch roads, the routing of control selector switch;
Two frequency mixers; Be divided into first frequency mixer and second frequency mixer; Said first frequency mixer is connected with first phase-locked loop; Said second frequency mixer is connected with second phase-locked loop, and the frequency input signal that receives from the monitoring subelement that each frequency mixer is respectively applied for the place branch road carries out mixing with the output frequency of the phase-locked loop that links to each other, and eliminates Doppler frequency shift;
Two phase-locked loops are divided into first phase-locked loop and second phase-locked loop, are respectively applied for the signal of locking different frequency, and the output frequency of two phase-locked loops symmetry changes;
A selector switch, the signal that two phase-locked loops is belonged to branch roads carries out routing.
7. according to the said mobile repeater of claim 6; It is characterized in that; Said monitoring subelement is used for; Be provided with during initialization, when the Doppler frequency shift value of signal is input to first phase-locked loop place branch road with this signal during for negative value, when the Doppler frequency shift value of signal on the occasion of the time this signal is input to second phase-locked loop place branch road.
8. according to each said mobile repeater of claim 5-7; It is characterized in that; Said monitoring subelement is used for according to the positive and negative difference of Doppler frequency shift value signal being distinguished judgement; During correspondence different decision condition signal is input to the branch road that different phase-locked loops belongs to, and the corresponding branch road of control gating is specially signal:
Doppler frequency shift value when signal
f d For on the occasion of; And during greater than first threshold value; Be that the reception frequency shift value that the signal of negative value is transferred to Set For Current is the phase-locked loop place branch road of negative value with frequency shift value respectively; With frequency shift value on the occasion of the signal reception frequency shift value that is transferred to Set For Current on the occasion of phase-locked loop place branch road, and two phase-locked loops places of control gating branch road;
Doppler frequency shift value when signal
f d For on the occasion of, and during smaller or equal to first threshold value, the reception frequency shift value that all signals is transferred to Set For Current on the occasion of phase-locked loop place branch road, and the reception frequency shift value of a control gating Set For Current be on the occasion of phase-locked loop belong to branch road;
Doppler frequency shift value when signal
f d Be negative value, and during more than or equal to second threshold value, the reception frequency shift value that all signals is transferred to Set For Current on the occasion of phase-locked loop place branch road, and the reception frequency shift value of a control selector switch gating Set For Current be on the occasion of phase-locked loop belong to branch road;
Frequency shift value when signal
f d Be negative value; And during less than second threshold value; Be provided with current reception frequency shift value on the occasion of phase-locked loop place branch road become that to receive frequency shift value be the branch road of negative value, and the phase-locked loop place branch road that current reception frequency shift value is set is negative value become receive frequency shift value on the occasion of branch road; Then respectively with frequency shift value on the occasion of signal be transferred to after being provided with the reception frequency shift value on the occasion of phase-locked loop place branch road; With frequency shift value is that the reception frequency shift value that the signal of negative value is transferred to after being provided with is the phase-locked loop place branch road of negative value, and two phase-locked loops places of control gating branch road.
9. said according to Claim 8 mobile repeater is characterized in that, said first threshold value be on the occasion of, said second threshold value is a negative value, these two threshold values are respectively applied for judges whether mobile repeater need change branch road and select to transmit with signal.
10. according to the said mobile repeater of claim 9, it is characterized in that said first threshold value and said second threshold value obtain through actual measurement.
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| CN102571165B (en) | 2014-09-17 |
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