CN105207766A - Frequency shift compensation method, device and mobile terminal - Google Patents
Frequency shift compensation method, device and mobile terminal Download PDFInfo
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- CN105207766A CN105207766A CN201410301979.6A CN201410301979A CN105207766A CN 105207766 A CN105207766 A CN 105207766A CN 201410301979 A CN201410301979 A CN 201410301979A CN 105207766 A CN105207766 A CN 105207766A
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Abstract
The invention relates to a frequency shift compensation method, a frequency shift compensation device and a mobile terminal. The frequency shift compensation method and device are used for compensating Doppler frequency shift in a mobile communication system. The method includes the following steps that: the position information of the mobile terminal is obtained; the position information of a base station into which the mobile terminal is connected is obtained; Doppler frequency shift is obtained based on the position information of the mobile terminal, the position information of the base station and the movement speed of the mobile terminal; and frequency of received and transmitted signals of the mobile terminal is compensated according to the Doppler frequency shift. The method can be executed in the operating process of the mobile terminal, and the compensation of the Doppler frequency shift of the received and transmitted signals of the mobile terminal can be realized fast and accurately, and the receiving and paging ability of the mobile terminal can be effectively improved, and the quality of voice and data service transmission of the mobile terminal can be improved, and the power consumption of a system can be effectively reduced, and user experience can be enhanced.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of frequency drift compensation method, device and mobile terminal.
Background technology
Along with the continuous progress of the communication technology, wireless mobile communications being applied to high-speed mobile environment is an important development trend.The overlay network of current high ferro comprises global system for mobile communications (GSM), broadband CDMA system (WCDMA) etc., when the mobile terminal of the standards such as described GSM, WCDMA is in the pattern of the high-speed cruisings such as high ferro, there is transmission data rate low, the problems such as cutting off rate is high, poor user experience.
Compared with common mobile communication environment, in high-speed mobile communications, one of most distinct issues are exactly that Doppler frequency shift can cause serious impact to the demodulation performance of base station and mobile terminal.
When mobile terminal at the volley, when particularly communicating at high speeds, the signal frequency of mobile terminal and base station receiving terminal can change, and is called Doppler effect.When mobile terminal translational speed is higher, correspondingly can cause Doppler shift also can be more serious, the performance of the restituted signal of base station and mobile terminal can be badly influenced, sometimes even can cause and cannot correctly detect, cause the phenomenons such as the call drop under the number of losing under mobile terminal standby mode, service condition to occur.Make under mobile terminal high-speed mobile environment, be difficult to the validity and reliability of guarantee information transmission, base station and terminal must carry out corresponding frequency drift compensation technology could meet information demand that is reliable, that effectively transmit.
In prior art, the existing estimation of multiple Doppler frequency shift and the method for compensation, such as, based on channel correlation properties Doppler frequency shift estimation method, utilize the methods such as feature space method of estimation, Power estimation method and wavelet analysis to estimate etc. Doppler frequency shift, but these method computational speeds are slow, adjusting range is less, often causes frequency-tracking not in time, can cause losing words, call drop phenomenon occurs.
Summary of the invention
The demodulation performance of what the present invention solved the is mobile terminal caused due to doppler shift effect is poor, and frequency-tracking not in time, can cause losing words, call drop phenomenon produced problem.
For solving the problem, technical solution of the present invention provides a kind of frequency drift compensation method, for compensating the Doppler frequency shift in mobile communication system; Comprise:
Obtain the positional information of mobile terminal;
Obtain the positional information of the base station that described mobile terminal accesses;
Translational speed based on the positional information of described mobile terminal, the positional information of described base station and described mobile terminal obtains Doppler frequency shift;
Compensate according to the frequency of described Doppler frequency shift to the receiving and transmitting signal of described mobile terminal.
Optionally, the positional information of described base station is by determining the signal measurements of the Serving cell corresponding to described base station.
Optionally, described signal measurements comprises the intensity level of described base station signal.
Optionally, described Doppler frequency shift is obtained by following formula:
Wherein, f_offset is described Doppler frequency shift, and θ is the angle in described mobile terminal moving direction and described base station signal propagation direction, and v is the speed of described motion of mobile terminals; C is electromagnetic wave propagation speed; F0 is the carrier frequency of described base station.
Optionally, the angle in described mobile terminal moving direction and described base station signal propagation direction is determined based on the positional information of described mobile terminal and the positional information of described base station.
Optionally, described compensating according to the frequency of described Doppler frequency shift to the receiving and transmitting signal of described mobile terminal comprises:
The frequency of the receiving and transmitting signal after the compensation of described mobile terminal is determined based on the frequency of the receiving and transmitting signal of described mobile terminal and described Doppler frequency shift.
Optionally, the environment of described motion of mobile terminals is high-speed railway environment.
Optionally, described mobile communication system is any one in GSM, GPRS, TD-SCDMA, CDMA2000, WCDMA and LTE communication system.
For solving the problem, technical solution of the present invention also provides a kind of frequency drift compensation device, for compensating the Doppler frequency shift in mobile communication system; Described device comprises:
Terminal location acquiring unit, for obtaining the positional information of mobile terminal;
Base station location acquiring unit, for obtaining the positional information of the base station that described mobile terminal accesses;
Frequency displacement acquiring unit, obtains Doppler frequency shift for the translational speed based on the positional information of described mobile terminal, the positional information of described base station and described mobile terminal;
Compensating unit, for compensating according to the frequency of described Doppler frequency shift to the receiving and transmitting signal of described mobile terminal.
Optionally, described device also comprises: measuring unit, for obtaining the signal measurements of the Serving cell corresponding to described base station.
Optionally, described frequency displacement acquiring unit obtains described Doppler frequency shift by following formula:
Wherein, f_offset is described Doppler frequency shift, and θ is the angle in described mobile terminal moving direction and described base station signal propagation direction, and v is the speed of described motion of mobile terminals; C is electromagnetic wave propagation speed; F0 is the carrier frequency of described base station.
Optionally, described device also comprises computing unit, for determining the angle in described mobile terminal moving direction and described base station signal propagation direction based on the positional information of described mobile terminal and the positional information of described base station.
For solving the problem, technical solution of the present invention also provides a kind of mobile terminal, comprises frequency drift compensation device as above.
Compared with prior art, technical scheme of the present invention has the following advantages:
By the positional information of mobile terminal, the positional information of the base station that described mobile terminal accesses and the translational speed of described mobile terminal obtain Doppler frequency shift, and then the Doppler shift compensation realized the input signal of described mobile terminal, the method can in the process of running of mobile terminal, fast, realize the compensation of the Doppler frequency shift of the receiving and transmitting signal to mobile terminal exactly, the ability of the paging receiving of the described mobile terminal of effective raising, improve the quality of described mobile terminal transferring voice and data service, the power consumption of effective reduction system, improve user experience.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the frequency drift compensation method that technical solution of the present invention provides;
Fig. 2 is the schematic flow sheet of the frequency drift compensation method that the embodiment of the present invention provides;
Fig. 3 is the angle schematic diagram in the mobile terminal moving direction that provides of the embodiment of the present invention and described base station signal propagation direction;
Fig. 4 is the corresponding schematic diagram between the speed of service of the mobile terminal that the embodiment of the present invention provides and maximum doppler frequency;
Fig. 5 is the Doppler shift compensation schematic diagram of the receiving and transmitting signal of the mobile terminal that the embodiment of the present invention provides;
Fig. 6 is the structural representation of the frequency drift compensation device that the embodiment of the present invention provides.
Embodiment
When mobile terminal is in high-speed cruising state, such as when described mobile terminal is in high ferro running environment, the signal received by mobile terminal of relative base station motion can be subject to the impact of Doppler effect, the frequency of the signal that the frequency of the signal that mobile terminal is received sends relative to base station has certain frequency displacement, namely there is Doppler frequency shift, the demodulation performance of mobile terminal can be caused poor by described doppler shift effect, be difficult to effectively, reliably the information such as voice, data service effectively be transmitted.
Doppler frequency estimation of the prior art and compensation method need based on a series of sampled signal to receiving and transmitting signal in mobile terminal usually, the Doppler frequency shift of mobile terminal just can be got by the mathematical iterations computing of complexity, method is comparatively complicated, is difficult to the operating frequency realized quickly and accurately mobile terminal and compensates accordingly.
In order to solve the problem, technical solution of the present invention provides a kind of frequency drift compensation method, for compensating the Doppler frequency shift in mobile communication system.
Fig. 1 is the schematic flow sheet of the frequency drift compensation method that technical solution of the present invention provides, and as shown in Figure 1, first performs step S1, obtains the positional information of mobile terminal.
Can by obtaining the positional information of described mobile terminal to the location of mobile terminal, the location of described mobile terminal refers to the positional information being obtained described mobile terminal by specific location technology, the latitude and longitude coordinates information of such as described mobile terminal, and then can mark on electronic chart by the position of anchored object.
Usually, the location of mobile terminal can be realized by the following two kinds location technology, and a kind of is location based on GPS, and a kind of is the location of base station based on mobile operation network.Locate mode based on GPS utilizes the GPS locating module on mobile terminal to realize location.Localization method based on base station is then utilize the measuring and calculating distance of base station to the distance of mobile terminal to determine the position of mobile terminal.The described localization method based on base station does not need mobile terminal to have GPS stationkeeping ability, but positioning precision largely depends on the distribution of base station and the size of coverage, has time error can be larger.Positioning precision based on GPS is higher.In addition, also have other method positioned mobile terminal, the acquisition methods of the positional information of described mobile terminal does not limit at this.
Perform step S2, obtain the positional information of the base station that described mobile terminal accesses.
The positional information of described base station can by determining the signal measurements of the Serving cell corresponding to described base station, such as, after mobile terminal is linked into base station, according to some relevant information that described mobile terminal obtains from base station, can determine the position of described base station.By the signal acquisition base station information received by mobile terminal, then disclosed in third party, base station information searches the latitude and longitude value of base station, and then can obtain concrete address information according to latitude and longitude value.The method of the positional information of concrete acquisition base station can adopt multiple method well-known to those skilled in the art to obtain accordingly.
Perform step S3, the translational speed based on the positional information of described mobile terminal, the positional information of described base station and described mobile terminal obtains Doppler frequency shift.
Determining the positional information of described mobile terminal, after the positional information of base station that described mobile terminal accesses, and then in conjunction with the movement velocity of described mobile terminal, the Doppler frequency shift computing formula shown by formula (1) can obtain the Doppler frequency shift between described mobile terminal and described base station.
Wherein, f_offset is described Doppler frequency shift, and θ is the angle in described mobile terminal moving direction and described base station signal propagation direction, and v is the speed of described motion of mobile terminals, is electromagnetic wave propagation speed; F0 is the carrier frequency of described base station.
Perform step S4, by described Doppler frequency shift, Doppler shift compensation is carried out to the receiving and transmitting signal of described mobile terminal.
After obtaining described Doppler frequency shift, Doppler shift compensation can be carried out based on the frequency of the receiving and transmitting signal of described Doppler frequency shift and described mobile terminal to the receiving and transmitting signal of described mobile terminal.
This method can according to the positional information of described mobile terminal, the positional information of the base station that described mobile terminal accesses and the motion velocity information in conjunction with described mobile terminal, in the process of mobile terminal high-speed cruising, can quick obtaining Doppler shift, and then fast, simple realization carries out Doppler shift compensation to the receiving and transmitting signal of mobile terminal, the demodulation performance of mobile terminal under high-speed cruising environment can be improved, reduce and lose words probability under mobile terminal standby mode, reduce the call drop probability under service condition, effective reduction system power dissipation, improve user experience.
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail specific embodiments of the invention below in conjunction with accompanying drawing.
Due to Doppler frequency shift to refer to due to transmitter and receiver between mutual motion, have certain deviation between the frequency that the frequency that receiver is received and transmitter send, this deviation is exactly Doppler frequency shift.The coherent demodulation performance caused between base station and mobile terminal reduces by Doppler frequency shift, described Doppler frequency shift can cause the decline of channel, and then to the normal speech business between mobile terminal and base station, data service, and the performance such as the cell reselection of mobile terminal and switching causes serious impact.
In second generation mobile communication system, the movement velocity of mobile terminal generally at 160km/h (thousand ms/h) once, and 3-G (Generation Three mobile communication system) requires that the movement velocity of the mobile terminal of normal work can reach about 500km/h, the raising of movement velocity will cause the increase of Doppler frequency shift, in the present embodiment, with the environment of motion of mobile terminals for high-speed railway environment, and the network formats of described mobile terminal is WCDMA is that example is described.
Under the high speed application scenarioss such as high ferro, the performance of Doppler frequency shift to network caused due to high-speed mobile affects greatly.Thus, under high ferro scene, need to carry out frequency offset correction to overcome the impact of Doppler frequency shift.
Fig. 2 is the schematic flow sheet of the frequency drift compensation method that the present embodiment provides.
First perform step S201, determine that described mobile terminal is in the pattern of high-speed cruising.
Because when described mobile terminal is in the pattern of high-speed cruising, the Doppler shift produced is larger, larger on the impact of the demodulation performance of mobile terminal, so first can determine whether described mobile terminal is in the pattern of high-speed cruising by step S201 herein, such as, whether operating in high ferro environment of described mobile terminal is determined.
Can determine whether it is in the state of high-speed cruising by the speed of described mobile terminal, when described mobile terminal is in high-speed cruising state, perform step S202.If described mobile terminal is not in the state of high-speed cruising, then the conventional frequency of method to the receiving and transmitting signal of mobile terminal can be adopted to compensate.
Perform step S201, obtain the positional information of mobile terminal.
The acquisition of the positional information of described mobile terminal can adopt multiple method to obtain, the positional information of described mobile terminal such as can be obtained according to GPS information, also can pass through AGPS (AssistedGPS, auxiliary global satellite positioning system) to locate accordingly mobile terminal in conjunction with network base station information and GPS information.
Perform step S202, obtain the positional information of described mobile terminal institute access base station.
By the estimation of mobile terminal to the measured value of the signal of be stationed community, the location to described base station can be realized.The measured value of described cell signal comprises the id information etc. of signal strength values, community.Such as can carry out corresponding estimation etc. by the size of signal strength values to the distance of base station, and then get the positional information of described mobile terminal institute access base station.
Perform step S203, obtain the angle in described mobile terminal moving direction and described base station signal propagation direction.
Please refer to Fig. 3, after the positional information of the positional information and described mobile terminal that determine base station, in conjunction with the moving direction of described mobile terminal, the angle in described mobile terminal moving direction and described base station signal propagation direction just can be determined fast, angle θ as shown in Figure 3.
Perform step S204, obtain the Doppler frequency shift between described base station and described mobile terminal.
Described Doppler frequency shift caused by Doppler effect can be obtained by formula as above (1).
Particularly, the value of described f0 is 2GHz, and the value of described propagation velocity of electromagnetic wave C is 3 × 10
5km/s (thousand meter per seconds).
As can be seen from formula, mobile terminal moving direction for move towards direction, base station time, during described Doppler shift compensation should be on the occasion of; And when direction, mobile terminal moving direction principle base station is moved, should be negative value during described Doppler shift compensation.
In mobile terminal moving process, Doppler frequency shift changes along with the change of customer location, and the maximum doppler frequency that base station receives is directly proportional to the movement velocity of mobile terminal, and the higher then frequency displacement of speed is larger.
The mobile terminal run in high ferro environment should have the adaptive capacity from static situation to 500km/h mobile environment, this requires that mobile terminal should be able to estimate Doppler shift in real time, fast, in conjunction with the velocity information of formula (1) according to the positional information of described mobile terminal, base station position information and mobile terminal, described mobile terminal can estimate Doppler frequency shift quickly and accurately.
Fig. 4 is the corresponding relation between the speed of service by mobile terminal as above accessed by step that provides of the present embodiment and maximum doppler frequency.
Please refer to Fig. 4, for the user of high-speed mobile, Doppler frequency shift is often very large, and when the speed of a motor vehicle is up to 500km/h, the Doppler frequency shift between base station and mobile terminal reaches 1981Hz, and this demodulation performance for mobile terminal and base station can cause serious impact.
For mobile terminal, estimating frequency error between the frequency values that receives and the intrinsic receive frequency of mobile terminal and completing correction of frequency errors is the function that mobile terminal must complete, otherwise will make a big impact to link performance, mobile terminal needs the fast-changing problem of reply frequency displacement, guarantees catch up with rapidly frequency displacement pace of change and effectively compensate.
Perform step S205, determine the frequency of the receiving and transmitting signal after the compensation of described mobile terminal based on the frequency of the receiving and transmitting signal of described mobile terminal and described Doppler frequency shift.
Incorporated by reference to reference to figure 5, when mobile terminal moves towards direction, base station, the offset of described Doppler frequency shift should be on the occasion of; When mobile terminal moves away from direction, base station, the offset of described Doppler frequency shift should be negative value, and as shown in Figure 5, when mobile terminal moves according to direction illustrated in fig. 5, mobile terminal first moves towards direction, base station, moves again afterwards away from direction, base station.
For the frequency of the receiving and transmitting signal of mobile terminal, the Doppler shift of one times should be considered for Received signal strength, and for base station, mobile terminal can send the frequency of signal according to the frequency adjustment of received signal, so the Doppler shift of twice should be considered.
In the process of described mobile terminal towards the movement of direction, base station, Doppler frequency shift f_offset is obtained by formula (1), when compensating the receiving and transmitting signal of mobile terminal, using F0+f_offset as the frequency values after the Received signal strength compensation of described mobile terminal, wherein, described F0 is the frequency values before described mobile terminal Received signal strength compensates, using F1+2 × f_offset as the frequency values after the transmission signal compensation of described mobile terminal, described F1 is the frequency values before described mobile terminal sends signal compensation.
Deviate from the process of direction, base station movement at described mobile terminal, when compensating the receiving and transmitting signal of mobile terminal, using F0-f_offset as the frequency values after the Received signal strength compensation of described mobile terminal, using F1-2 × f_offset as the frequency values after the transmission signal compensation of described mobile terminal.
The frequency drift compensation method that the present embodiment provides, in the process of running of mobile terminal, can realize the compensation of the Doppler frequency shift of the receiving and transmitting signal to mobile terminal quickly and accurately.
The frequency drift compensation method provided by the present embodiment, real-time tracking and correction can be carried out to the frequency deviation of the receiving and transmitting signal of mobile terminal, thus the reduction of the Demodulation Systems performance that Doppler frequency shift larger in high ferro communication can be suppressed to bring, ensure the network coverage quality in high ferro communication, improve the Experience Degree of user.
It should be noted that, in the present embodiment, after getting the Doppler frequency shift of mobile terminal, be the frequency based on the receiving and transmitting signal of described mobile terminal and described Doppler frequency shift, in conjunction with the moving method of mobile terminal, realize the Doppler effect correction of described mobile terminal, in other embodiments, after obtaining described values of Doppler frequency shift, also can adopt the compensation of other method realization to mobile terminal, the concrete method compensated is not specifically limited at this.
It should be noted that; in the present embodiment; from the Doppler shift compensation of mobile terminal being carried out to explaination in detail; in other embodiments; the method that also can provide based on the present embodiment; realize compensation to the Doppler frequency shift of base station, the acquisition methods of any Doppler frequency shift provided based on the present embodiment, realize all belonging to the present invention's scope required for protection to the estimation of the Doppler frequency shift of mobile terminal, base station and compensation method.
Corresponding above-mentioned frequency drift compensation method, the embodiment of the present invention also provides a kind of frequency drift compensation device, for compensating the Doppler frequency shift in mobile communication system, Fig. 6 is the structural representation of the frequency drift compensation device that the present embodiment provides, and described device comprises terminal location acquiring unit U11, base station location acquiring unit U12, frequency displacement acquiring unit U13 and compensating unit U14.
Described terminal location acquiring unit U11, for obtaining the positional information of mobile terminal;
Described base station location acquiring unit U12, for obtaining the positional information of the base station that described mobile terminal accesses;
Described frequency displacement acquiring unit U13, obtains Doppler frequency shift for the translational speed based on the positional information of described mobile terminal, the positional information of described base station and described mobile terminal;
Described compensating unit U14, for compensating according to the frequency of described Doppler frequency shift to the receiving and transmitting signal of described mobile terminal.
Described device also comprises measuring unit U15, for obtaining the signal measurements of the Serving cell corresponding to described base station, determines the positional information of described base station based on described measured value.
Described device also comprises computing unit U16, for determining the angle in described mobile terminal moving direction and described base station signal propagation direction based on the positional information of described mobile terminal and the positional information of described base station.
Corresponding above-mentioned frequency drift compensation device, the embodiment of the present invention also provides a kind of mobile terminal, comprises frequency drift compensation device as above.
Although the present invention discloses as above, the present invention is not defined in this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.
Claims (13)
1. a frequency drift compensation method, for compensating the Doppler frequency shift in mobile communication system; It is characterized in that, comprising:
Obtain the positional information of mobile terminal;
Obtain the positional information of the base station that described mobile terminal accesses;
Translational speed based on the positional information of described mobile terminal, the positional information of described base station and described mobile terminal obtains Doppler frequency shift;
Compensate according to the frequency of described Doppler frequency shift to the receiving and transmitting signal of described mobile terminal.
2. frequency drift compensation method as claimed in claim 1, it is characterized in that, the positional information of described base station is by determining the signal measurements of the Serving cell corresponding to described base station.
3. frequency drift compensation method as claimed in claim 1, it is characterized in that, described signal measurements comprises the intensity level of described base station signal.
4. frequency drift compensation method as claimed in claim 1, is characterized in that, obtain described Doppler frequency shift by following formula:
Wherein, f_offset is described Doppler frequency shift, and θ is the angle in described mobile terminal moving direction and described base station signal propagation direction, and v is the speed of described motion of mobile terminals; C is electromagnetic wave propagation speed; F0 is the carrier frequency of described base station.
5. frequency drift compensation method as claimed in claim 4, it is characterized in that, the angle in described mobile terminal moving direction and described base station signal propagation direction is determined based on the positional information of described mobile terminal and the positional information of described base station.
6. frequency drift compensation method as claimed in claim 1, it is characterized in that, described compensating according to the frequency of described Doppler frequency shift to the receiving and transmitting signal of described mobile terminal comprises:
The frequency of the receiving and transmitting signal after the compensation of described mobile terminal is determined based on the frequency of the receiving and transmitting signal of described mobile terminal and described Doppler frequency shift.
7. frequency drift compensation method as claimed in claim 1, it is characterized in that, the environment of described motion of mobile terminals is high-speed railway environment.
8. frequency drift compensation method as claimed in claim 1, is characterized in that, described mobile communication system is any one in GSM, GPRS, TD-SCDMA, CDMA2000, WCDMA and LTE communication system.
9. a frequency drift compensation device, for compensating the Doppler frequency shift in mobile communication system; It is characterized in that, comprising:
Terminal location acquiring unit, for obtaining the positional information of mobile terminal;
Base station location acquiring unit, for obtaining the positional information of the base station that described mobile terminal accesses;
Frequency displacement acquiring unit, obtains Doppler frequency shift for the translational speed based on the positional information of described mobile terminal, the positional information of described base station and described mobile terminal;
Compensating unit, for compensating according to the frequency of described Doppler frequency shift to the receiving and transmitting signal of described mobile terminal.
10. frequency drift compensation device as claimed in claim 9, is characterized in that, also comprise: measuring unit, for obtaining the signal measurements of the Serving cell corresponding to described base station.
11. frequency drift compensation devices as claimed in claim 9, it is characterized in that, described frequency displacement acquiring unit obtains described Doppler frequency shift by following formula:
Wherein, f_offset is described Doppler frequency shift, and θ is the angle in described mobile terminal moving direction and described base station signal propagation direction, and v is the speed of described motion of mobile terminals; C is electromagnetic wave propagation speed; F0 is the carrier frequency of described base station.
12. frequency drift compensation devices as claimed in claim 11, it is characterized in that, also comprise: computing unit, for determining the angle in described mobile terminal moving direction and described base station signal propagation direction based on the positional information of described mobile terminal and the positional information of described base station.
13. 1 kinds of mobile terminals, is characterized in that, comprising:
Frequency drift compensation device as described in any one of claim 9 to 12.
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| CN113259025A (en) * | 2021-04-08 | 2021-08-13 | 中国电子科技集团公司第二十九研究所 | Calibration system and method for broadband radio frequency receiving device |
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