CN101959261B - Signal selection method and equipment in high-speed moving scene - Google Patents
Signal selection method and equipment in high-speed moving scene Download PDFInfo
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- CN101959261B CN101959261B CN 200910089023 CN200910089023A CN101959261B CN 101959261 B CN101959261 B CN 101959261B CN 200910089023 CN200910089023 CN 200910089023 CN 200910089023 A CN200910089023 A CN 200910089023A CN 101959261 B CN101959261 B CN 101959261B
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Abstract
The embodiment of the invention discloses signal selection method and equipment in a high-speed moving scene. The signal selection method is applied to mobile equipment comprising a first repeater and a second repeater; the mobile equipment sends downlink signals to a mobile terminal positioned in a coverage area of the mobile equipment, wherein a first antenna arranged on the first repeater faces to a mobile direction, and a second antenna arranged on the second repeater is reversed to the mobile direction. The signal selection method comprises the following steps of: acquiring a first downlink signal acquired by the first antenna arranged on the first repeater and a second downlink signal acquired by the second antenna arranged on the second repeater; and selecting the downlink signals sent to the mobile terminal positioned in the coverage area according to sources and/or the signal intensity of the first downlink signal and the second downlink signal. The embodiment of the invention enhances the success rate of cell switching and reselection of the mobile terminal in the high-speed moving scene.
Description
Technical field
The present invention relates to communication technical field, relate in particular to signal selection method and equipment under a kind of high-speed mobile scene.
Background technology
The high-speed mobile scene is the difficult point that cellular radio Communication covers, under the high speed scene, owing to reasons such as the fast change of Doppler frequency deviation, channel, signal multipaths, the downstream signal from the base station that causes portable terminal to receive is poor, and the upward signal from portable terminal that also causes the base station to receive simultaneously is poor.The existence of Doppler frequency deviation and multipath causes the coherent demodulation performance of base station and mobile phone to reduce, and directly has influence on performances such as cell selecting, sub-district gravity treatment, switching.
In order to address these problems, in the prior art, AFC (Automatic Frequency Correction, automatic frequency correction) technology and channel equalization technique in portable terminal and base station, have all been used.Doppler frequency deviation can be proofreaied and correct by the AFC function in portable terminal and base station, solves multi-path problem by channel equalization technique.
Portable terminal and base station are by the signal quality deteriorates problem under employing AFC and the channel equalization technique solution high-speed mobile environment, but it is limited to improve effect.Theory analysis and emulation testing show, when train speed per hour was 200 kilometers left and right sides, systematic function began to have had tangible deterioration, and is especially bigger to the data service impact, when train speed per hour is 300 kilometers and when above, the portable terminal of 2000MHz can't correctly obtain the information of neighbor cell.In addition, when train speed per hour is 300 kilometers and when above, may carries out the signal that Doppler frequency deviation proofreaies and correct to needs and correctly select.
With scene shown in Figure 1 is example: in the high-speed mobile scene, repeater in the object of existing high-speed mobile (as the compartment) receives by omnidirectional antenna 1 and moves the downstream signal that base station along the line sends, and downstream signal is carried out sending by the portable terminal of antenna 2 in the overlay area after the processing and amplifying; Receive the upward signal that the portable terminal in the overlay area sends by antenna 2 simultaneously, upward signal is carried out sending to moving base station along the line by antenna 1 after the processing and amplifying.
Problems of the prior art are, in the environment of high-speed mobile, have tangible Doppler frequency deviation in this upward signal and the downstream signal, need carry out the treatment for correcting of Doppler frequency deviation.In addition, some position such as M1 on moving direction, the power from the signal of different districts that omnidirectional antenna 1 receives equates, but the Doppler frequency deviation that receives from moving direction forward direction sub-district, with under the moving direction situation that but the Doppler frequency deviation equal and opposite in direction phase place that receives of sub-district is opposite dorsad, the repeater can't be selected the portable terminal of which signal in the overlay area sent.
Summary of the invention
The embodiment of the invention provides signal selection method and the equipment under a kind of high-speed mobile scene, is used to realize that the signal under the high-speed mobile scene is selected.
For achieving the above object, the embodiment of the invention provides the signal selection method under a kind of high-speed mobile scene, be applied to comprise in the mobile device of first repeater and second repeater, wherein, be installed on first antenna on first repeater towards moving direction, be installed on second antenna moving direction dorsad on second repeater, described method comprises:
Obtain first downstream signal that first antenna on first repeater collects, and second downstream signal that collects of second antenna on second repeater;
According to the source and/or the signal strength signal intensity of first downstream signal and second downstream signal, the downstream signal of selecting the portable terminal in the overlay area to send.
Wherein, described source and/or signal strength signal intensity according to first downstream signal and second downstream signal, the downstream signal of selecting the portable terminal in the overlay area to send specifically comprises:
When first downstream signal and second downstream signal are signal from different districts, first downstream signal and second downstream signal are closed the downstream signal that sends as the portable terminal in the overlay area behind the road;
When first downstream signal and second downstream signal are signal from same sub-district, the stronger signal of power in first downstream signal and second downstream signal is chosen as the downstream signal that the portable terminal in the overlay area sends.
Wherein, also comprise:
To the downstream signal that the portable terminal of described selection in the overlay area sends, carry out Doppler frequency deviation and proofread and correct.
Wherein, described Doppler frequency deviation is proofreaied and correct and is specifically comprised:
Obtain the down-bound pilot frequency signal in the described downstream signal, it is synchronous that described down-bound pilot frequency signal is demodulated to the laggard line frequency of base band, the reference signal of the Doppler frequency deviation that obtains frequency and be to have superposeed;
Generate local oscillation signal according to described reference signal;
After described local oscillation signal and described downstream signal carried out mixing, obtain having offset in the frequency intermediate-freuqncy signal of Doppler frequency deviation;
Described intermediate-freuqncy signal and the local oscillation signal that produces according to standard signal are carried out mixing, obtained offsetting downstream signal after the correction of Doppler frequency deviation.
Wherein, also comprise: receive the upward signal that the portable terminal in the described overlay area sends, Doppler frequency deviation is compensated to described upward signal after, send by described first antenna and/or second antenna.
Wherein, describedly Doppler frequency deviation compensated to described upward signal comprise:
Obtain the down-bound pilot frequency signal in the described downstream signal, it is synchronous that described down-bound pilot frequency signal is demodulated to the laggard line frequency of base band, the reference signal of the Doppler frequency deviation that obtains frequency and be to have superposeed;
Generate local oscillation signal according to described reference signal;
After described local oscillation signal and described upward signal carried out mixing, the intermediate-freuqncy signal of the Doppler frequency deviation that obtains having superposeed in the frequency;
Described intermediate-freuqncy signal and the local oscillation signal that produces according to standard signal are carried out mixing, upward signal after the compensation of the Doppler frequency deviation that obtained superposeing.
Wherein, the front and back of described first antenna and second antenna ratio is greater than 20dB.
The present invention also provides a kind of mobile device, comprise first repeater and second repeater, wherein, be installed on first antenna on first repeater towards moving direction, be installed on second antenna moving direction dorsad on second repeater, described mobile device also comprises: control device and mixer;
Described control device is used to obtain first downstream signal that first antenna on first repeater collects, and second downstream signal that collects of second antenna on second repeater; Source and/or signal strength signal intensity according to first downstream signal that obtains and second downstream signal, the downstream signal that the portable terminal of selection in the overlay area sends, and with the downstream signal selected by described mixer after the portable terminal in day alignment overlay area send.
Wherein, described control device comprises:
The downstream signal acquiring unit is used to obtain first downstream signal that first antenna on described first repeater collects, and second downstream signal that collects of second antenna on described second repeater;
The downstream signal selected cell is used for first downstream signal that obtains according to described downstream signal acquiring unit and the source and/or the signal strength signal intensity of second downstream signal, the downstream signal of selecting the portable terminal in the overlay area to send.
Wherein, described downstream signal selected cell specifically is used for:
When described first downstream signal and second downstream signal are signal from different districts, described first downstream signal and second downstream signal are closed the downstream signal that sends as the portable terminal in the overlay area behind the road;
When described first downstream signal and second downstream signal are signal from same sub-district, the stronger signal of power in described first downstream signal and second downstream signal is chosen as the downstream signal that the portable terminal in the overlay area sends.
Wherein, comprise in described first repeater and second repeater:
The Frequency Synchronization unit is used for for the downstream signal that receives, and obtains frequency and signal strength signal intensity and notifies described control device, and obtain the reference signal of the Doppler frequency deviation that superposeed according to down-bound pilot frequency signal;
The standard signal generation unit is used to generate the standard signal that does not have Doppler frequency deviation;
The local oscillation signal generation unit is used for generating first local oscillation signal according to the described reference signal that has superposeed Doppler frequency deviation, generates second local oscillation signal according to described standard signal;
Signal correction unit after being used for described first local oscillation signal and described downstream signal carried out mixing, obtains having offset in the frequency intermediate-freuqncy signal of Doppler frequency deviation; Described intermediate-freuqncy signal is carried out filtering amplify the back and carry out mixing, obtained offsetting downstream signal after the correction of Doppler frequency deviation with described second local oscillation signal;
Signal compensation unit is used for receiving the upward signal that the portable terminal of described overlay area sends, described first local oscillation signal and described upward signal are carried out mixing after, the intermediate-freuqncy signal of the Doppler frequency deviation that obtains having superposeed in the frequency; Described intermediate-freuqncy signal is carried out carrying out mixing, upward signal after the compensation of the Doppler frequency deviation that obtained superposeing with described second local oscillation signal after filtering is amplified.
Wherein, the front and back of described first antenna and second antenna ratio is greater than 20dB.
Wherein, described control device is arranged in described first repeater or second repeater.
Compared with prior art, the embodiment of the invention has the following advantages:
The application of the invention embodiment, use amphiorentation antenna binary channels to receive the two-way downstream signal, and the downstream signal of in the two-way downstream signal, selecting the portable terminal in the overlay area to send, improved the sub-district switching of portable terminal under the high-speed mobile scene and the success rate of gravity treatment.
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 to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only 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 that the prior art high speed moves the network condition schematic diagram under the scene;
Fig. 2 is the structural representation of mobile device in the embodiment of the invention;
Fig. 3 is the structural representation of control device in the embodiment of the invention;
Fig. 4 is the structural representation of the repeater that provides in the embodiment of the invention;
Fig. 5 is the structural representation of repeater in the embodiment of the invention application scenarios;
Fig. 6 is the application schematic diagram of mobile device under the high-speed mobile scene that provides in the embodiment of the invention;
Fig. 7 is that embodiment of the invention high speed moves the signal selection method flow chart under the scene;
Fig. 8 is a flow chart of selecting the downstream signal of the portable terminal transmission in the overlay area in the embodiment of the invention;
Fig. 9 is the flow chart of the signal selection method that provides in the embodiment of the invention;
Figure 10 be provide in the embodiment of the invention downstream signal is carried out the flow chart that Doppler frequency deviation is proofreaied and correct;
Figure 11 is the flow chart that upward signal is carried out Doppler frequency deviation compensation that provides in the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of embodiment of the invention protection.
A kind of mobile device is provided in the embodiment of the invention, has been used under the high-speed mobile scene sending downstream signal to the portable terminal of its overlay area, this mobile device can be deployed in the railway car of high-speed railway.Its structure as shown in Figure 2, comprise first repeater 1 and second repeater 2, wherein be installed on first antenna 11 on first repeater 1 towards moving direction, be installed on second antenna 21 moving direction dorsad on second repeater, first antenna 11 and second antenna 12 are for having certain front and back than the unidirectional reception antenna of (Front BackRatio) (for example than greater than 20dB).
This mobile device also comprises: control device 3 and mixer 4;
Control device 3 is used to obtain first downstream signal that first antenna 11 on first repeater 1 collects, and second downstream signal that collects of second antenna 21 on second repeater 2; Source and/or signal strength signal intensity according to first downstream signal that obtains and second downstream signal, the downstream signal that the portable terminal of selection in the overlay area sends, and with the downstream signal selected by mixer 3 after the portable terminal in day alignment overlay area send.
As shown in Figure 3, further comprise in this control device 3:
Downstream signal acquiring unit 31 is used to obtain first downstream signal that first antenna 11 on first repeater 1 collects, and second downstream signal that collects of second antenna 21 on second repeater 2;
Downstream signal selected cell 32 is used for first downstream signal that obtains according to downstream signal acquiring unit 31 and the source and/or the signal strength signal intensity of second downstream signal, the downstream signal of selecting the portable terminal in the overlay area to send.
Concrete, downstream signal selected cell 32 specifically is used for:
When first downstream signal and second downstream signal are signal from different districts, first downstream signal and second downstream signal are closed the downstream signal that sends as the portable terminal in the overlay area behind the road;
When first downstream signal and second downstream signal are signal from same sub-district, the stronger signal of power in first downstream signal and second downstream signal is chosen as the downstream signal that the portable terminal in the overlay area sends.
Need to prove, this control device 3 both can be the functional unit of individualism in the mobile device, also can be arranged in first repeater 1 or second repeater 2, when being arranged in a certain repeater, the repeater at control device 3 places is the main repeater of using, and carries out the function of control device 3.
In order to realize correction, in first repeater and second repeater that the mobile device of the embodiment of the invention comprises, all has calibration function to Doppler frequency deviation to Doppler frequency deviation under the high-speed mobile scene.
Concrete, as shown in Figure 4, in first repeater and second repeater that the embodiment of the invention provides, comprising:
Standard signal generation unit 200 is used to generate the standard signal that does not have Doppler frequency deviation;
Local oscillation signal generation unit 300, be used for the stack that generates according to Frequency Synchronization unit 100 reference signal of Doppler frequency deviation generate first local oscillation signal, the standard signal that generates according to standard signal generation unit 200 generates second local oscillation signal;
Below in conjunction with a concrete application scenarios, the specific implementation of the repeater that is used for the Doppler frequency deviation correction in the embodiment of the invention is described.As shown in Figure 5, this repeater that is used for the Doppler frequency deviation correction specifically comprises:
101: the first antennas are used to receive the downstream signal of base station 131, launch the upward signal from the portable terminal in the overlay area simultaneously.
102: coupler, the base station down signal is used to be coupled, to send to frequency synchronization module 121 and Frequency Division Duplexing (FDD) device 103 respectively according to the ratio that is provided with from the downstream signal of the base station 131 that first antenna 101 receives, carry out Frequency Synchronization by 121 pairs of these base station down signals of frequency synchronization module; The upward signal that also is used for receiving from Frequency Division Duplexing (FDD) device 103 sends to first antenna 101.
103,111: the Frequency Division Duplexing (FDD) device, the Frequency Division Duplexing (FDD) device can received and dispatched simultaneously in binary channels, and binary channels is operated on the different frequency ranges, and has certain protection at interval.
104: the descending LNA in repeater, be used for downstream signal is amplified, the noise factor of amplifier self is very low simultaneously, has avoided the interference to downstream signal.
112: the direct end uplink LNA, be used for upward signal is amplified, the noise factor of amplifier self is very low simultaneously, has avoided the interference to upward signal.
106,108,110,114,116,118: radio frequency amplifier, the radio-frequency power that is used for to the received signal amplifies.
105,109,113,117: frequency mixer, be used for input signal and local oscillation signal are carried out mixing, obtain the output signal after the frequency change, wherein the signals of frequency mixer 123 and 126 outputs are intermediate-freuqncy signal, the signals of frequency mixer 124 and 125 outputs are up-conversion signal.
107,115: the intermediate frequency Surface Acoustic Wave Filter.Be used for the useful signal of frequency mixer 123 and 126 intermediate-freuqncy signals of exporting is exported, the unwanted signal in the intermediate-freuqncy signals of frequency mixer 123 and 126 outputs is decayed and filtering.
123,124,125,126: frequency synthesizer is used to frequency mixer to provide frequency conversion employed local oscillation signal.The signal that is used to generate local oscillation signal both can be the reference signal f0 that frequency synchronization module 121 provides, and also can be the standard signal f1 that constant-temperature crystal oscillator 122 provides.There is not Doppler frequency deviation in the Doppler frequency deviation that wherein superposeed in the frequency of the reference signal f0 that provides of frequency synchronization module 121 in the frequency of the standard signal f1 that constant-temperature crystal oscillator 122 provides.
121: frequency synchronization module, the function of realization Frequency Synchronization.The pilot signal that this frequency synchronization module 121 receives in base station down signals, and this down-bound pilot frequency signal is demodulated to base band, obtain the frequency of pilot signal by related algorithm in base band.In the high-speed mobile scene, the frequency of the reference signal f0 that frequency synchronization module obtains synchronously is the base station reference frequency of Doppler frequency deviation of having superposeed.This frequency synchronization module also is used to measure the frequency and the power of the downstream signal that receives, and sends to control device.
122: constant-temperature crystal oscillator, it is the standard signal f1 of standard frequency accurately that frequency is provided, the frequency error that this constant-temperature crystal oscillator provides is less than ± 0.01ppm (part per million, a few millionths are used to describe the variation that frequency of oscillation takes place with the extraneous factor influence).
When using the repeater that Doppler frequency deviation as shown in Figure 5 proofreaies and correct, on down direction, the flow process that the Doppler frequency deviation that downstream signal is carried out is proofreaied and correct comprises:
Downstream signal process antenna 101, duplexer 102 and LNA 103, the input of arrival frequency mixer 105, this signal is the signal that has Doppler frequency deviation.
121 pairs of downstream signals of frequency synchronization module carry out Frequency Synchronization, obtain existing the reference signal f0 of Doppler frequency deviation, and frequency synthesis module 123 produces local oscillation signal according to reference signal f0, and there is Doppler frequency deviation equally in this local oscillation signal.
Exist the local oscillation signal of Doppler frequency deviation and downstream signal after frequency mixer 105 carries out mixing, obtained offsetting the downstream signal of Doppler frequency deviation.
There is not the intermediate-freuqncy signal of Doppler frequency deviation in frequency mixer 105 outputs, advance intermediate frequency Surface Acoustic Wave Filter 107, reach the input of frequency mixer 109 behind the radio frequency amplifier 108.
The local oscillation signal of frequency mixer 109 is that frequency synthesizer 124 produces by standard signal f1, does not have Doppler frequency deviation in this local oscillation signal.
Intermediate-freuqncy signal and this do not exist the local oscillation signal of Doppler frequency deviation after frequency mixer 109 carries out up-conversion, obtain not having the downstream signal of Doppler frequency deviation, and send to mixer.So far, the process of the Doppler frequency deviation correction of downstream signal has been finished in the repeater.
When using the repeater of Doppler frequency deviation correction as shown in Figure 5, on up direction, the trimming process of upward signal and downstream signal trimming process are in like manner, just in advance the Doppler frequency deviation compensation is sent to portable terminal to up signal again, thereby make the upward signal that arrives the base station not have frequency deviation.The flow process that the Doppler frequency deviation that upward signal is carried out compensates comprises:
121 pairs of downstream signals of frequency synchronization module carry out Frequency Synchronization, obtain existing the reference signal f0 of Doppler frequency deviation, and frequency synthesis module 123 produces local oscillation signal according to reference signal f0, and there is Doppler frequency deviation equally in this local oscillation signal.
Exist the local oscillation signal of Doppler frequency deviation and upward signal after frequency mixer 126 carries out mixing, the intermediate-freuqncy signal of the Doppler frequency deviation that obtains frequency and be to have superposeed.
There is the intermediate-freuqncy signal of Doppler frequency deviation in frequency mixer 126 outputs, advance intermediate frequency Surface Acoustic Wave Filter 115, reach the input of frequency mixer 125 behind the radio frequency amplifier 116.
The local oscillation signal of frequency mixer 125 is that frequency synthesizer 124 produces by standard signal f1, does not have Doppler frequency deviation in this local oscillation signal.
Exist the intermediate-freuqncy signal of Doppler frequency deviation and this local oscillation signal that does not have Doppler frequency deviation after frequency mixer 125 carries out up-conversion, obtain existing the upward signal after the compensation of Doppler frequency deviation, and send to the base station by antenna 101.So far, the process of the Doppler frequency deviation compensation of upward signal has been finished in the repeater.
Repeater structure and method that above-mentioned Doppler frequency deviation shown in Figure 5 is proofreaied and correct, the just a kind of optional mode that the signal that has Doppler frequency deviation is handled.Be understandable that, when the method that provides according to the embodiment of the invention gets access to needs when carrying out signal that Doppler frequency deviation proofreaies and correct, the method of signal being carried out the Doppler frequency deviation correction is not limited to the method that the above embodiment of the present invention provides, for other available Doppler frequency deviation bearing calibrations, the embodiment of the invention is not enumerated one by one at this.
During the above-mentioned mobile device that uses that the embodiment of the invention provides, the network scenarios under the high-speed mobile scene as shown in Figure 6.Wherein, the mobile device of the embodiment of the invention can be deployed in the railway car of high-speed railway, and it comprises two repeaters, and in the antenna of two repeaters, first antenna 202 is installed on front portion, compartment (with respect to moving direction), and towards moving direction; Second antenna 201 is installed on compartment afterbody (with respect to moving direction), and moving direction dorsad.Among Fig. 6:
203, the first repeaters; 204, the second repeaters are used to select the downstream signal that user terminal sends in coverage, and the downstream signal of selecting is carried out being sent to mixer after Doppler frequency deviation correction and the signal amplification; Or the upward signal that mixer sends carried out that Doppler frequency deviation is proofreaied and correct and signal is sent to the base station after amplifying.
201, the first antennas; 202, the second antennas; Be directional antenna, the front and back ratio of antenna is greater than 20dB; Wherein second antenna is towards moving direction, and first antenna is moving direction dorsad.
206: mixer, the signal that first repeater 203 and second repeater 204 are sent carry out with the road after be sent to cover antenna 205 in the compartment; Send to first repeater 203 and/or second repeater 204 when receiving the upward signal that cover antenna 205 sends in the compartment.
205: cover antenna in the compartment; Be used for user terminal transmission downstream signal in coverage, receive the upward signal that user terminal sends in the coverage and also send to mixer.
In this system, with use omnidirectional antenna to carry out downstream signal in the prior art to receive and different be, second antenna 202 in the embodiment of the invention only cooperates with second repeater 204 and forward signal to be carried out Doppler frequency deviation is proofreaied and correct and signal amplifies, and first antenna 201 cooperates the signal amplification of only backward signal being carried out the Doppler frequency deviation correction with first repeater 203.Simultaneously, frequency synchronization module in first repeater 203 and second repeater 204 is measured signal strength signal intensity and frequency, when the control device (not shown) judge that first repeater 203 and second repeater 204 receive be same cell signal the time, control device is judged the size of signal power strength, for the repeater that receives lower-powered signal, control device can notify it to need not the downstream signal that receives is carried out the Doppler frequency deviation treatment for correcting, does not also need its downstream signal is sent to mixer; For the repeater that receives the bigger signal of power, control device is notified this repeater that the signal that receives is carried out Doppler frequency deviation and is proofreaied and correct, and the downstream signal after will proofreading and correct is through sending by the portable terminal of cover antenna 205 in the compartment in the overlay area behind the mixer, because there is Doppler frequency deviation more by force and not in its signal power, can be so that the portable terminal in the overlay area obtains signal and communication effect preferably.When control device judge that first repeater 203 and second repeater 204 receive be the signal of different districts the time, all open two repeaters, amplify the signal of communication of two sub-districts simultaneously and carry out the Doppler frequency deviation correction, downstream signal after control device will be proofreaied and correct switches and the sub-district gravity treatment thereby the control portable terminal carries out the sub-district according to the downstream signal from different districts in the overlay area through sending by the portable terminal of cover antenna 205 in the compartment in the overlay area behind the mixer; For example by the signal measurement result from different districts of network side according to mobile terminal reporting, the control portable terminal carries out the sub-district and switches and the sub-district gravity treatment.Carrying out the signal reception with use omnidirectional antenna in the prior art compares, direct discharging station in the embodiment of the invention can be according to the signal selection method that is provided with, select to obtain the downstream signal that need the portable terminal in the overlay area sends in the two-way downstream signal that in the high-speed mobile scene, is receiving, and this signal is carried out Doppler frequency deviation proofread and correct.Therefore, embodiments of the invention by the amphiorentation antenna can effective address signal multi-path problem, simultaneously the Doppler frequency deviation under the high-speed mobile scene is proofreaied and correct, the sub-district of having improved portable terminal in the high-speed mobile scene reaches success rate for switching again.
The mobile device that the application of the invention embodiment provides, use amphiorentation antenna binary channels to receive the two-way downstream signal, and the downstream signal of in the two-way downstream signal, selecting the portable terminal in the overlay area to send, efficiently solve the multi-path problem of signal, proofread and correct by Doppler frequency deviation in addition, improved the sub-district switching of portable terminal under the high-speed mobile scene and the success rate of gravity treatment downstream signal and upward signal.
Signal selection method under a kind of high-speed mobile scene also is provided in the embodiment of the invention, has been applied to comprise in the mobile device of first repeater and second repeater, the portable terminal of this mobile device in its overlay area sends downstream signal.Wherein be installed on first antenna on first repeater towards moving direction, be installed on second antenna moving direction dorsad on second repeater, as shown in Figure 7, this method comprises:
Step s701, obtain first downstream signal that first antenna on first repeater collects, and second downstream signal that collects of second antenna on second repeater;
Step s702, according to the source and/or the signal strength signal intensity of first downstream signal and second downstream signal, the downstream signal of selecting the portable terminal in the overlay area to send.
Below in conjunction with concrete application scenarios, the execution mode of signal selection method under the high-speed mobile scene that provides in the embodiment of the invention and Doppler frequency deviation bearing calibration is elaborated.
In the embodiment of the invention, under the high-speed mobile scene, go up two repeaters of installation at the object (as every joint railway car of train) of high-speed mobile, as shown in Figure 8, relative position is to place along moving direction between the antenna of these two repeaters.First antenna of first repeater is positioned at the front portion, compartment, towards identical with moving direction; Second antenna of second repeater be positioned at the rear portion, compartment, towards opposing with moving direction.Wherein, first antenna and second antenna are for having the unidirectional reception antenna (for example before and after ratio greater than 20dB) of certain front and back than (Front Back Ratio), with guarantee first antenna and second antenna receive only from its towards signal, be not subjected to interference from dorsad signal.By first antenna, first repeater receives first downstream signal of the base station transmission on the moving direction and sends the downstream signal of portable terminal; By second antenna, second repeater receives second downstream signal of the base station transmission on moving in the other direction and sends the downstream signal of portable terminal.
The repeater belongs to the frequency multiplying arrangement, is to play a kind of radio transmission transferring equipment that signal strengthens in the wireless communication transmissions process, and its basic function is carried out power to radiofrequency signal and strengthened.The repeater obtains downstream signal and carries out filtering in down link in existing overlay area, the signal of filtering is transmitted into after amplifying once more treats the overlay area.In up link, the signal of the mobile device in the overlay area is sent to the base station after filtering and processing and amplifying.Thereby realize the signal transmission between the mobile device in base station and the overlay area.Repeater in the embodiment of the invention also has the calibration function of Doppler frequency deviation except the function with traditional repeater.
In this application scenarios, concrete signal selection method comprises as shown in Figure 9:
Step s901, obtain first downstream signal and second downstream signal.
Concrete, the cycle that is operating as of first downstream signal and second downstream signal of obtaining in this step carries out, and this cycle is by the downstream signal acquisition time interval determination of stipulating in the agreement.
Step s902, judge that whether first downstream signal and second downstream signal be the signal from different districts; Be then to carry out step s903, otherwise carry out step s905.
This judgement can be carried out according to the frequency of downstream signal, when the frequency of first downstream signal and second downstream signal is identical, is judged as the signal from same cells, otherwise is the signal from different districts.Wherein the frequency of first downstream signal is measured by first repeater, and the frequency of second downstream signal is measured by second repeater.
Step s903, when first downstream signal and second downstream signal are signal from same sub-district, obtain the power of first downstream signal and second downstream signal.
Wherein the power of first downstream signal is measured by first repeater, and the power of second downstream signal is measured by second repeater.
Step s904, the stronger signal of power in first downstream signal and second downstream signal is chosen as the downstream signal that the portable terminal in the overlay area sends.If power equates, then can select a signal at random.Flow process finishes.
Step s905, when first downstream signal and second downstream signal are signal from different districts, first downstream signal and second downstream signal are closed the downstream signal that sends as the portable terminal in the overlay area behind the road.Flow process finishes.
Above-mentioned signal selects flow process to be carried out by a control device, this control device is connected with second repeater with first repeater, the frequency and the power of second downstream signal that the frequency of first downstream signal that sends according to first repeater and power and second repeater send, the downstream signal of selecting the portable terminal in the overlay area to send; For receiving the repeater of power than weak signal, control device can be controlled it and need not the downstream signal that receives is carried out the Doppler frequency deviation treatment for correcting, does not also need its downstream signal is sent to mixer simultaneously.This control device also can be arranged in first repeater and second repeater.Being positioned at first repeater with this control device is example, then first repeater is the main repeater of using, second repeater sends to first repeater with the frequency and the power of second downstream signal, the frequency and the power of second downstream signal that the frequency of first downstream signal that first repeater is measured according to self and power and second repeater send, the downstream signal of selecting the portable terminal in the overlay area to send.When this control device was positioned at second repeater, then second repeater was that the master uses the repeater, and the processing mode when its processing mode is positioned at first repeater to control device is similar.
Except downstream signal and the transmission of the portable terminal in the overlay area that the portable terminal of selecting in first downstream signal that receives and second downstream signal in the overlay area sends, also need to receive the upward signal that the portable terminal in the overlay area sends by the antenna in the overlay area.And the upward signal that receives sent by first antenna or second day alignment corresponding district.
Consider the Doppler frequency deviation that causes under the high-speed mobile scene, the downstream signal that also needs the portable terminal in the subtend overlay area to send carries out the correction of Doppler frequency deviation, so that the portable terminal in the overlay area receives the downstream signal of no Doppler frequency deviation; The upward signal that portable terminal in the overlay area is sent carries out the Doppler frequency deviation compensation, so that the base station receives the upward signal of no Doppler frequency deviation.
What provide in the embodiment of the invention as shown in figure 10, carries out the flow process that Doppler frequency deviation proofreaies and correct to downstream signal and comprises:
Step s1001, obtain the down-bound pilot frequency signal in the downstream signal, it is synchronous that down-bound pilot frequency signal is demodulated to the laggard line frequency of base band, the reference signal of the Doppler frequency deviation that obtains frequency and be to have superposeed.
Step s1002, generate local oscillation signal according to reference signal.
Step s1003, local oscillation signal and downstream signal carried out mixing after, obtain having offset in the frequency intermediate-freuqncy signal of Doppler frequency deviation.
Step s1004, intermediate-freuqncy signal and the local oscillation signal that produces according to standard signal are carried out mixing, obtained offsetting downstream signal after the correction of Doppler frequency deviation.
As shown in figure 11, the flow process that upward signal is carried out Doppler frequency deviation compensation that provides in the embodiment of the invention comprises:
Step s1101, obtain the down-bound pilot frequency signal in the downstream signal, it is synchronous that down-bound pilot frequency signal is demodulated to the laggard line frequency of base band, the reference signal of the Doppler frequency deviation that obtains frequency and be to have superposeed.
Step s1102, generate local oscillation signal according to reference signal.
Step s1103, local oscillation signal and upward signal carried out mixing after, the intermediate-freuqncy signal of the Doppler frequency deviation that obtains having superposeed in the frequency.
Step s1104, intermediate-freuqncy signal and the local oscillation signal that produces according to standard signal are carried out mixing, upward signal after the compensation of the Doppler frequency deviation that obtained superposeing.
In the embodiment of the invention, the Doppler frequency deviation that downstream signal is carried out is proofreaied and correct and upward signal is carried out the compensation of Doppler frequency deviation, finishes by the repeater.
The method that the application of the invention embodiment provides, use amphiorentation antenna binary channels to receive the two-way downstream signal, and the downstream signal of in the two-way downstream signal, selecting the portable terminal in the overlay area to send, efficiently solve the multi-path problem of signal, proofread and correct by Doppler frequency deviation in addition, improved the sub-district switching of portable terminal under the high-speed mobile scene and the success rate of gravity treatment downstream signal and upward signal.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, unit in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the unit in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.A unit can be merged in the unit of the foregoing description, also can further split into a plurality of subelements.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
Claims (11)
1. the signal selection method under the high-speed mobile scene, it is characterized in that, be applied to comprise in the mobile device of first repeater and second repeater, wherein, be installed on first antenna on first repeater towards moving direction, be installed on second antenna moving direction dorsad on second repeater, described method comprises:
Obtain first downstream signal that first antenna on first repeater collects, and second downstream signal that collects of second antenna on second repeater;
Source and/or signal strength signal intensity according to first downstream signal and second downstream signal, the downstream signal that the portable terminal of selection in the overlay area sends, and the downstream signal that the portable terminal of described selection in the overlay area sends is carried out Doppler frequency deviation proofread and correct;
Wherein, described Doppler frequency deviation is proofreaied and correct and specifically comprised: obtain the down-bound pilot frequency signal in the described downstream signal, it is synchronous that described down-bound pilot frequency signal is demodulated to the laggard line frequency of base band, the reference signal of the Doppler frequency deviation that obtains frequency and be to have superposeed; Generate local oscillation signal according to described reference signal; After described local oscillation signal and described downstream signal carried out mixing, obtain having offset in the frequency intermediate-freuqncy signal of Doppler frequency deviation; Described intermediate-freuqncy signal and the local oscillation signal that produces according to standard signal are carried out mixing, obtained offsetting downstream signal after the correction of Doppler frequency deviation.
2. the method for claim 1 is characterized in that, described source and/or signal strength signal intensity according to first downstream signal and second downstream signal, and the downstream signal of selecting the portable terminal in the overlay area to send specifically comprises:
When first downstream signal and second downstream signal are signal from different districts, first downstream signal and second downstream signal are closed the downstream signal that sends as the portable terminal in the overlay area behind the road;
When first downstream signal and second downstream signal are signal from same sub-district, the stronger signal of power in first downstream signal and second downstream signal is chosen as the downstream signal that the portable terminal in the overlay area sends.
3. the method for claim 1 is characterized in that, also comprises: receive the upward signal that the portable terminal in the described overlay area sends, Doppler frequency deviation is compensated to described upward signal after, send by described first antenna and/or second antenna.
4. method as claimed in claim 3 is characterized in that, describedly Doppler frequency deviation is compensated to described upward signal comprises:
Obtain the down-bound pilot frequency signal in the described downstream signal, it is synchronous that described down-bound pilot frequency signal is demodulated to the laggard line frequency of base band, the reference signal of the Doppler frequency deviation that obtains frequency and be to have superposeed;
Generate local oscillation signal according to described reference signal;
After described local oscillation signal and described upward signal carried out mixing, the intermediate-freuqncy signal of the Doppler frequency deviation that obtains having superposeed in the frequency;
Described intermediate-freuqncy signal and the local oscillation signal that produces according to standard signal are carried out mixing, upward signal after the compensation of the Doppler frequency deviation that obtained superposeing.
5. method as claimed in claim 1 or 2 is characterized in that, the front and back ratio of described first antenna and second antenna is greater than 20dB.
6. a mobile device is characterized in that, comprises first repeater and second repeater, wherein, be installed on first antenna on first repeater towards moving direction, be installed on second antenna moving direction dorsad on second repeater, described mobile device also comprises: control device and mixer;
Described control device is used to obtain first downstream signal that first antenna on first repeater collects, and second downstream signal that collects of second antenna on second repeater; Source and/or signal strength signal intensity according to first downstream signal that obtains and second downstream signal, the downstream signal that the portable terminal of selection in the overlay area sends, and with the downstream signal selected by described mixer after the portable terminal in day alignment overlay area send;
Wherein, comprise in described first repeater:
The Frequency Synchronization unit is used for for the downstream signal that receives, and obtains frequency and signal strength signal intensity and notifies described control device, and obtain the reference signal of the Doppler frequency deviation that superposeed according to down-bound pilot frequency signal;
The standard signal generation unit is used to generate the standard signal that does not have Doppler frequency deviation;
The local oscillation signal generation unit also is used for generating first local oscillation signal according to the described reference signal that has superposeed Doppler frequency deviation;
Signal correction unit after being used for described first local oscillation signal and described downstream signal carried out mixing, obtains having offset in the frequency intermediate-freuqncy signal of Doppler frequency deviation; Described intermediate-freuqncy signal is carried out filtering amplify the back and carry out mixing, obtained offsetting downstream signal after the correction of Doppler frequency deviation with described second local oscillation signal.
7. mobile device as claimed in claim 6 is characterized in that, described control device comprises:
The downstream signal acquiring unit is used to obtain first downstream signal that first antenna on described first repeater collects, and second downstream signal that collects of second antenna on described second repeater;
The downstream signal selected cell is used for first downstream signal that obtains according to described downstream signal acquiring unit and the source and/or the signal strength signal intensity of second downstream signal, the downstream signal of selecting the portable terminal in the overlay area to send.
8. mobile device as claimed in claim 7 is characterized in that, described downstream signal selected cell specifically is used for:
When described first downstream signal and second downstream signal are signal from different districts, described first downstream signal and second downstream signal are closed the downstream signal that sends as the portable terminal in the overlay area behind the road;
When described first downstream signal and second downstream signal are signal from same sub-district, the stronger signal of power in described first downstream signal and second downstream signal is chosen as the downstream signal that the portable terminal in the overlay area sends.
9. mobile device as claimed in claim 7 is characterized in that, comprises in described second repeater:
The Frequency Synchronization unit is used for for the downstream signal that receives, and obtains frequency and signal strength signal intensity and notifies described control device;
The standard signal generation unit is used to generate the standard signal that does not have Doppler frequency deviation;
The local oscillation signal generation unit is used for generating second local oscillation signal according to described standard signal;
Signal compensation unit is used for receiving the upward signal that the portable terminal of described overlay area sends, described first local oscillation signal and described upward signal are carried out mixing after, the intermediate-freuqncy signal of the Doppler frequency deviation that obtains having superposeed in the frequency; Described intermediate-freuqncy signal is carried out carrying out mixing, upward signal after the compensation of the Doppler frequency deviation that obtained superposeing with described second local oscillation signal after filtering is amplified.
10. as each described mobile device in the claim 6 to 9, it is characterized in that the front and back ratio of described first antenna and second antenna is greater than 20dB.
11., it is characterized in that described control device is arranged in described first repeater or second repeater as each described mobile device in the claim 6 to 9.
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| CN102724149B (en) * | 2012-05-16 | 2015-09-09 | 华为技术有限公司 | Frequency offset precompensation method, accidental access method, equipment and system |
| CN104378323B (en) * | 2014-12-03 | 2018-06-08 | 中国电子科技集团公司第五十四研究所 | A kind of low speed modem based on FFT calibrating frequency algorithms |
| US10904752B2 (en) * | 2016-05-27 | 2021-01-26 | Lg Electronics Inc. | Method for allocating terminal identifier in distributed antenna communication system and device for same |
| CN106937379B (en) * | 2017-01-24 | 2020-03-31 | 北京元心科技有限公司 | Handheld terminal scheduling method and system |
| CN108736135B (en) * | 2017-04-14 | 2019-12-13 | 京东方科技集团股份有限公司 | Antenna system and mobile device |
| WO2018223379A1 (en) * | 2017-06-09 | 2018-12-13 | Oppo广东移动通信有限公司 | Signal processing method and device |
| CN110233645B (en) * | 2019-06-11 | 2021-08-31 | Oppo广东移动通信有限公司 | Antenna switching method and device, electronic equipment and computer readable storage medium |
| CN112671500B (en) * | 2020-07-07 | 2024-01-26 | 北京交通大学 | Co-channel interference suppression method and corresponding communication terminal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2687956Y (en) * | 2004-02-11 | 2005-03-23 | 中国电子科技集团公司第五十四研究所 | Doppler frequency shift correcting device for high speed mobile satellite satellite communication |
| CN1783864A (en) * | 2004-11-30 | 2006-06-07 | 株式会社东芝 | Orthogonal frequency division multiplexing (OFDM) receiver |
| CN101060357A (en) * | 2007-06-07 | 2007-10-24 | 上海交通大学 | Single frequency network signal line style coverage method for rail traffic |
-
2009
- 2009-07-20 CN CN 200910089023 patent/CN101959261B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2687956Y (en) * | 2004-02-11 | 2005-03-23 | 中国电子科技集团公司第五十四研究所 | Doppler frequency shift correcting device for high speed mobile satellite satellite communication |
| CN1783864A (en) * | 2004-11-30 | 2006-06-07 | 株式会社东芝 | Orthogonal frequency division multiplexing (OFDM) receiver |
| CN101060357A (en) * | 2007-06-07 | 2007-10-24 | 上海交通大学 | Single frequency network signal line style coverage method for rail traffic |
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Address after: 100032 No. 29, Finance Street, Beijing, Xicheng District Patentee after: CHINA MOBILE COMMUNICATIONS GROUP Co.,Ltd. Patentee after: Jingxin Network System Co., Ltd Address before: 100032 No. 29, Finance Street, Beijing, Xicheng District Patentee before: CHINA MOBILE COMMUNICATIONS Corp. Patentee before: Jingxin communication system (China) Co., Ltd |