CN103686981B - It is treat or lead to mobile terminal and its frequency offset regulation method more more - Google Patents
It is treat or lead to mobile terminal and its frequency offset regulation method more more Download PDFInfo
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- CN103686981B CN103686981B CN201210324174.4A CN201210324174A CN103686981B CN 103686981 B CN103686981 B CN 103686981B CN 201210324174 A CN201210324174 A CN 201210324174A CN 103686981 B CN103686981 B CN 103686981B
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Abstract
The present invention relates to treating one kind more or lead to mobile terminal more, it only uses single reference clock generator.The mobile terminal includes：Multiple radio frequency units, are respectively suitable for the plurality of network；Reference clock generator, for producing the clock signal of reference frequency and being supplied to each radio frequency unit；Multiple measuring units, are respectively used to measure frequency deviation of the mobile terminal under each network；Adjustment unit, at least one based on multiple frequency deviations determines an adjustment frequency deviation, and adjusts the reference frequency of the reference clock generator accordingly, and calculates at least one of residual frequency departure of the plurality of radio frequency unit after the adjustment；And at least one digital frequency deviation adjustment unit, for being adjusted in numeric field there is the radio frequency unit of residual frequency departure to eliminate the residual frequency departure.
Description
Technical field
The present invention relates to communication terminal is moved on to, more particularly, to the frequency offset regulation method for treating more or leading to more mobile terminal.
Background technology
The fast development of mobile communication causes different communication standard simultaneously and deposited that the mobile communication standard of current main flow is just wrapped
Include GSM/GPRS/EDGE, IS-95 (CDMA), CDMA2000, TD-SCDMA, WCDMA, LTE TDD and LTE FDD etc..This
In the case of, to supporting the simultaneously online terminal of multiple networks, i.e. the demand of multi-standby terminal or bilateral terminal is consequently increased.
In multi-standby terminal, the standard of multiple networks can be with identical or difference.By taking double-standby terminal or bilateral terminal as an example,
Two networks can be for adhere to that the GSM network or this standard of GSM, LTE of two different operators are different separately two
Network.Double-standby terminal typically requires that terminal keeps holding state in two networks simultaneously, but is not required for two networks while entering
Industry is engaged in, and bilateral terminal can be also supported further in two networks while carry out business.The work side received and dispatched from terminal data
Seen in formula, double-standby terminal may be needed while receiving data in two networks, but synchronization is only sent in one network
Data；And bilateral terminal is except supporting that in two networks, while receiving data, also support sends number in two networks simultaneously
According to.It should be noted that according to the selection of radio frequency chip, double-standby terminal may also be by the way of time-sharing multiplex in synchronization
Only data are received in a network.But in the context of the present invention, double-standby terminal represents to need to receive in two networks simultaneously
Access evidence（Beep-page message etc.）Terminal.
All it is to provide base by a high-precision crystal oscillator during terminal normal work to ensure the normal transmitting-receiving of data
Quasi- frequency, and the local oscillation signal with the synchronization of network keep frequency is produced based on the reference frequency.For example, terminal is generally used at present
26MHz reference clocks.Frequency Synchronization is general by being adjusted realizations to crystal oscillator, namely by adjusting 26MHz reference clocks reality
It is existing.The reason for causing frequency departure is a lot, for example：There is frequency error in network side base station, caused by terminal movement in itself
Doppler shift, due to frequency departure caused by temperature change and crystal oscillator self character.These factors cause work in heterogeneous networks
The reference frequency of work is different, and the change of the reference frequency and frequency of heterogeneous networks is independent mutually.
Current double-standby terminal or bilateral terminal typically provide the reference frequency of heterogeneous networks respectively using two crystal oscillators, and
The frequency produced against two crystal oscillators is independently controlled and adjusted.The clock scheme of existing typical double-standby terminal or bilateral terminal
As shown in figure 1, two reference clock generators 13,14 respectively produce a set of reference clock using a crystal oscillator.During this two sets of benchmark
Clock is the first radio frequency unit 15 under two heterogeneous networks, the second radio frequency unit 16 provides reference frequency.Digital baseband core
Piece 10 includes two measurements and adjustment unit 11,12, can two reference clock generators of independent control 13,14 to adjust two respectively
The reference frequency of individual network.But this scheme needs to use multiple crystal oscillators, terminal cost of implementation and complexity are added.
The content of the invention
It is an object of the present invention to provide treating one kind more or leading to terminal more, single reference clock generator need to be only used
Reference frequency is provided.
It is a further object of the present invention to provide a kind of frequency offset regulation methods treated or lead to terminal more, during based on single benchmark more
Clock generator provides reference frequency.
The present invention to solve the technical scheme that uses of above-mentioned technical problem is treated or more logical mobile terminal one kind more, can
Presence is kept in multiple networks simultaneously, the mobile terminal includes：Multiple radio frequency units, are respectively suitable for the plurality of network；
Reference clock generator, for producing the clock signal of reference frequency and being supplied to each radio frequency unit；Multiple measuring units, respectively
For measuring frequency deviation of the mobile terminal under each network；Adjustment unit, one is determined based at least one of multiple frequency deviations
Frequency deviation is adjusted, and adjusts the reference frequency of the reference clock generator accordingly, and calculates the plurality of radio frequency unit after the adjustment
At least one of residual frequency departure；And at least one digital frequency deviation adjustment unit, it is residual for having in numeric field adjustment
The radio frequency unit of frequency deviation is stayed to eliminate the residual frequency departure.
In one embodiment of this invention, the adjustment unit is to determine the adjustment based on the first frequency deviation in the plurality of frequency deviation
Frequency deviation, the adjustment frequency deviation can calibrate first frequency deviation completely, and the wherein in the plurality of radio frequency unit of first frequency deviation correspondence
One radio frequency unit；After the calibration, the radio frequency unit in the plurality of radio frequency unit in addition to the first radio frequency unit is respectively residual with one
Stay frequency deviation, and at least one digital frequency deviation adjustment unit numeric field adjust the radio frequency unit beyond first radio frequency unit with
Eliminate each residual frequency departure.
In one embodiment of this invention, the adjustment unit is based on the first frequency deviation and the second frequency deviation in the plurality of frequency deviation
The adjustment frequency deviation is determined, the adjustment frequency deviation at least can respectively partially calibrate first frequency deviation and second frequency deviation, through the school
After standard, each radio frequency unit has a residual frequency departure respectively, and at least one digital frequency deviation adjustment unit is adjusted in numeric field respectively
Whole each radio frequency unit is to eliminate each residual frequency departure.
In one embodiment of this invention, the adjustment frequency deviation is α * f0+ (1- α) * f1, and wherein f0 is first frequency deviation, f1
For second frequency deviation, α is the coefficient between (0,1).
In one embodiment of this invention, first frequency deviation and second frequency deviation are any twos in the plurality of frequency deviation.
In one embodiment of this invention, first frequency deviation and second frequency deviation are the maximum frequency in the plurality of frequency deviation respectively
Partially with minimum frequency deviation.
In one embodiment of this invention, the mobile terminal is treated or bilateral mobile terminal to be double.
In one embodiment of this invention, the mobile terminal is treated or threeway mobile terminal for three.
In one embodiment of this invention, the plurality of measuring unit, the adjustment unit and at least one digital frequency deviation are adjusted
Whole unit is arranged in a digital baseband chip.
In one embodiment of this invention, at least one digital frequency deviation adjustment unit and the radio frequency list with residual frequency departure
Member is corresponded.
The present invention separately proposes a kind of frequency offset regulation method treated or lead to mobile terminal more more, and this treats or lead to mobile terminal more
Presence can be kept in multiple networks simultaneously, this method comprises the following steps：Measurement mobile terminal is in multiple networks respectively
Under frequency deviation；At least one based on multiple frequency deviations determines an adjustment frequency deviation；Single benchmark is adjusted according to the adjustment frequency deviation
The reference frequency of clock generator, the single reference clock generator produces the clock signal of reference frequency and is respectively supplied to pair
Should multiple networks multiple radio frequency units；Calculate at least one of residual frequency of the plurality of radio frequency unit after the adjustment
Partially；And adjust the radio frequency unit with residual frequency departure to eliminate the residual frequency departure in numeric field.
In one embodiment of this invention, the step of at least one based on the plurality of frequency deviation determines an adjustment frequency deviation
Including：The adjustment frequency deviation is determined based on the first frequency deviation in the plurality of frequency deviation, the adjustment frequency deviation can calibrate first frequency completely
Partially, the first radio frequency unit wherein in the plurality of radio frequency unit of first frequency deviation correspondence；Wherein after the calibration, the plurality of radio frequency
Radio frequency unit in unit in addition to the first radio frequency unit respectively has a residual frequency departure, and has residual frequency departure in numeric field adjustment
Radio frequency unit included with eliminating the step of the residual frequency departure：The radio frequency unit beyond first radio frequency unit is adjusted in numeric field
To eliminate each residual frequency departure.
In one embodiment of this invention, the step of at least one based on the plurality of frequency deviation determines an adjustment frequency deviation
Including：The adjustment frequency deviation is determined based on the first frequency deviation and the second frequency deviation in the plurality of frequency deviation, the adjustment frequency deviation can at least divide
First frequency deviation and second frequency deviation are not partly calibrated；Wherein after the calibration, each radio frequency unit has a residual frequency respectively
Partially, included in radio frequency unit of the numeric field adjustment with residual frequency departure with eliminating the step of the residual frequency departure：Respectively in numeral
Domain adjusts each radio frequency unit to eliminate each residual frequency departure.
In one embodiment of this invention, the adjustment frequency deviation is α * f0+ (1- α) * f1, and wherein f0 is first frequency deviation, f1
For second frequency deviation, α is the coefficient between (0,1).
In one embodiment of this invention, first frequency deviation and second frequency deviation are any twos in the plurality of frequency deviation.
In one embodiment of this invention, first frequency deviation and second frequency deviation are the maximum frequency in the plurality of frequency deviation respectively
Partially with minimum frequency deviation.
In one embodiment of this invention, the mobile terminal is treated or bilateral mobile terminal to be double.
In one embodiment of this invention, the mobile terminal is treated or threeway mobile terminal for three.
The present invention is allowed to compared with prior art, when the present invention only needs to single benchmark due to using above technical scheme
Clock generator, therefore saved the cost of product.
Brief description of the drawings
For the above objects, features and advantages of the present invention can be become apparent, below in conjunction with tool of the accompanying drawing to the present invention
Body embodiment elaborates, wherein：
Fig. 1 show it is existing it is double treat or bilateral terminal in clock scheme schematic diagram.
Fig. 2 show one embodiment of the invention it is double treat or bilateral terminal in clock scheme schematic diagram.
Fig. 3 show another embodiment of the present invention it is double treat or bilateral terminal in clock scheme schematic diagram.
Fig. 4 shows the clock scheme schematic diagrames treated or led in terminal more of further embodiment of this invention more.
Fig. 5 shows the frequency offset regulation method flow of one embodiment of the invention.
Embodiment
The basic thought of the present invention is, using a set of high precision reference clock realize treat/lead to terminal, due to the set more
The difference of reference clock and grid reference clock and the frequency shift (FS) that produces are calibrated in data processing.It can so save
A set of high precision reference clock system（Crystal oscillator/crystal）, so as to reduce terminal cost of implementation, improve the market competitiveness.
Fig. 2 show one embodiment of the invention it is double treat or bilateral terminal in clock scheme schematic diagram.In the present embodiment,
Terminal can be the electronic equipments such as the mobile phone with mobile communication function, tablet personal computer, notebook computer.Shown in reference picture 2, system
Including the first radio frequency unit 25 and the second radio frequency unit 26, the transmitting-receiving of two network wireless signals is respectively used to.However, system is only
Comprising a reference clock generator 27, high precision reference clock is provided using the circuit comprising crystal oscillator, and to the first radio frequency list
The radio frequency unit 26 of member 25 and second provides reference frequency.
In one embodiment, the first radio frequency unit 25 and the second radio frequency unit 26 can each be operated in LTE（Long Term Evolution）
Under pattern, 2G or 3G patterns.2G or 3G patterns are, for example, GSM/GPRS/EDGE, IS-95 (CDMA), CDMA2000, TD-
SCDMA and WCDMA mode.
In one embodiment, reference clock generator 27 can provide typical 26MHz reference clock signals.But can manage
Solution, reference clock generator 27 can provide the clock signal under other frequencies as needed.The reference clock signal is penetrated with first
The network of one of radio frequency unit in the radio frequency unit 26 of frequency unit 25 and second, such as the first radio frequency unit 25 work is base
Standard is adjusted.
Digital baseband chip 20 is the basic element of character of terminal, for carrying out Digital Signal Processing, generates the number of up transmission
It is believed that number and receive the data-signal of downlink reception.In the present embodiment, digital baseband chip 20 is configured as further including
First measuring unit 21, the second measuring unit 22, adjustment unit 23 and digital frequency deviation adjustment unit 24.The He of first measuring unit 21
Second measuring unit 22 is respectively used to measure the frequency deviation of two networks, and frequency deviation is exported to adjustment unit 23.Adjustment unit 23
For generating the adjust instruction of reference clock according to the first measuring unit 21, the output signal of the second measuring unit 22 and needing numeral
The residual frequency departure size of frequency deviation adjustment.Digital frequency deviation adjustment unit 24 is used for the residual frequency departure size inputted according to adjustment unit 23
In digital processing domain frequency deviation adjustment is carried out to sending or/and receiving signal.
First measuring unit 21 and the second measuring unit 22 can respectively measure the frequency deviation of a network.Those skilled in the art
Member is it is appreciated that the frequency deviation measurement method for various criterion or network is had nothing in common with each other；For same standard, it is possibility to have a variety of
Frequency deviation measurement scheme.For example, in one embodiment of this invention, two networks are respectively gsm system and TD-SCDMA system,
Frequency deviation measurement can be realized by comparing received training sequence and sending the phase offset between training sequence in gsm system,
The data symbol that can be exported in TD-SCDMA system by using joint-detection realizes frequency deviation measurement.In another implementation of the present invention
In example, one of Web vector graphic LTE system, the frequency deviation measurement in LTE system is then based on reference signal（Reference
Signal, RS）Carry out.
Still it is described with the example that two networks are respectively gsm system and TD-SCDMA system.At a time, it is based on
Conventional measurement and frequency deviation adjustable strategies, respectively obtaining needs the frequency deviation size point of adjustment in gsm system and TD-SCDMA system
Wei not f0 and f1.Fig. 5 shows the frequency offset regulation method flow of one embodiment of the invention, incorporated by reference to reference picture 2 and Fig. 5.
It is frequency deviation measurement step 501 first.Measured respectively each in the first measuring unit 21 and the second measuring unit 22
After the frequency deviation size of network, export to adjustment unit 23.Adjustment unit 23 can carry out frequency deviation adjustment accordingly.Due to two networks
Frequency deviation is different, it will be understood to those skilled in the art that adjustment of the adjustment unit 23 to reference clock can not meet two simultaneously
The demand of network.In the present embodiment, adjustment unit 23 may decide that on the basis of one of network to determine adjustment frequency
Partially（Step 502）.Such as step 503, adjustment unit 23 calculates the residual of another network according to the reference frequency difference of two networks
Frequency deviation is stayed, this residual frequency departure is the foundation that digital frequency deviation adjustment unit 24 is adjusted.In step 504, adjustment unit 23 is by basis
Adjust the instruction of frequency deviation generation reference clock adjustment.
For example, adjustment unit 23 is using gsm system as master network, measurement and frequency deviation adjustable strategies based on gsm system, adjustment
The control word of reference clock generator 27 realizes the adjustment and calibration to frequency deviation f0.After adjustment, GSM mode has reached and net
The Frequency Synchronization of network, and TD-SCDMA patterns are different with GSM due to the frequency deviation for needing to adjust, and also remain the frequency deviation of f1-f0 sizes
Do not adjust, this residual frequency departure also needs to be calibrated and adjusted by digital frequency deviation adjustment unit 24.TD-SCDMA patterns
Residual frequency departure be both likely larger than its original frequency deviation f1, it is also possible to less than its original frequency deviation f1.
Such as step 505, digital frequency deviation adjustment 24 then further according to the residual frequency departure digital processing domain to sending or/and
Receive signal and carry out frequency deviation adjustment.It will be understood to those skilled in the art that frequency deviation shows as a linear phase in numeric field
Position skew, therefore the frequency offset correction of numeric field can be by correcting phase offset realization.For example, when two networks are respectively GSM
And TD-SCDMA, using GSM as master network, the frequency offset correction of numeric field is carried out for TD-SCDMA network.
In a preferred embodiment, digital frequency deviation adjustment unit 24 can be further divided into two submodules：Upstream digital frequency
Offset compensation module and downstream digital frequency offset compensation block, realize the digital frequency deviation compensation of uplink and downlink data and calibrate respectively.
It will be understood to those skilled in the art that when implementing, the frequency deviation compensation and calibration of numeric field can by by time domain from
Scattered sampled signal carries out phase place realization, is not described in detail herein.
Because the frequency deviation adjusting range of digital processing domain has certain limitations, therefore in an alternative embodiment of the invention, in order to
Increase frequency adjustment range, further one digital frequency deviation adjustment unit of increase.So, two networks will correspond to a number respectively
Word frequency deviation adjustment unit.
Fig. 3 show another embodiment of the present invention it is double treat or bilateral terminal in clock scheme schematic diagram.The institute of reference picture 3
Show, system includes the first radio frequency unit 36 and the second radio frequency unit 37, is respectively used to the transmitting-receiving of two network wireless signals.So
And, system provides high precision reference clock only comprising reference clock generator 38, using the circuit comprising crystal oscillator, and to the
One radio frequency unit 36 and the second radio frequency unit 37 provide reference frequency.
In one embodiment, the first radio frequency unit 36 and the second radio frequency unit 37 can be operated in LTE（Long Term Evolution）Pattern,
Under 2G or 3G patterns.2G or 3G patterns be, for example, GSM/GPRS/EDGE, IS-95 (CDMA), CDMA2000, TD-SCDMA and
WCDMA mode.
In one embodiment, reference clock generator 38 can provide typical 26MHz reference clock signals.But can manage
Solution, reference clock generator 38 can provide the clock signal under other frequencies as needed.The adjustment of the reference clock signal is same
When consider the first radio frequency unit 36 and the second radio frequency unit 37 work network.
Digital baseband chip 30 is the basic element of character of terminal, for carrying out Digital Signal Processing, generates the number of up transmission
It is believed that number and receive the data-signal of downlink reception.In the present embodiment, digital baseband chip 30 is configured as further including
First measuring unit 31, the second measuring unit 32, adjustment unit 33, the first digital frequency deviation adjustment unit 34 and the second digital frequency deviation
Adjustment unit 35.First measuring unit 31 and the second measuring unit 32 are respectively used to measure the frequency deviation of two networks, and by frequency deviation
Export to adjustment unit 33.Adjustment unit 33 is used to be given birth to according to the first measuring unit 31, the output signal of the second measuring unit 32
Into reference clock adjust instruction and need digital frequency deviation adjust residual frequency departure size.First digital frequency deviation adjustment unit 34 and
Two digital frequency deviation adjustment units 35 are respectively used to according to the residual frequency departure size of the input of adjustment unit 33 in digital processing domain to hair
Send or/and receive signal and carry out frequency deviation adjustment.
First measuring unit 31 and the second measuring unit 32 can respectively measure the frequency deviation of a network.Those skilled in the art
Member is it is appreciated that the frequency deviation measurement method for various criterion or network is had nothing in common with each other；For same standard, it is possibility to have a variety of
Frequency deviation measurement scheme.For example, in one embodiment of this invention, two networks are respectively gsm system and TD-SCDMA system,
Frequency deviation measurement can be realized by comparing received training sequence and sending the phase offset between training sequence in gsm system,
The data symbol that can be exported in TD-SCDMA system by using joint-detection realizes frequency deviation measurement.In another implementation of the present invention
In example, one of Web vector graphic LTE system, the frequency deviation measurement in LTE system is then based on reference signal（Reference
Signal, RS）Carry out.
Still it is described with the example that two networks are respectively gsm system and TD-SCDMA system.At a time, it is based on
Conventional measurement and frequency deviation adjustable strategies, respectively obtaining needs the frequency deviation size point of adjustment in gsm system and TD-SCDMA system
Wei not f0 and f1.Fig. 5 shows the frequency offset regulation method flow of one embodiment of the invention, incorporated by reference to reference picture 3 and Fig. 5.
It is the step 501 for measuring frequency deviation first, is measured respectively respectively in the first measuring unit 31 and the second measuring unit 32
After the frequency deviation size of automatic network, export to adjustment unit 33.Adjustment unit 33 can carry out frequency deviation adjustment accordingly.Due to two networks
Frequency deviation it is different, it will be understood to those skilled in the art that adjustment of the adjustment unit 33 to reference clock can not meet two simultaneously
The demand of individual network.Simultaneously it will be understood to those skilled in the art that the frequency deviation adjusting range of numeric field has certain limitations, if
Frequency deviation is excessive, due to the limitation and influence of bandwidth/wave filter, and receipt signal frequency spectrum can distort to influence performance.Accordingly, it would be desirable to
The size of numeric field frequency offset correction is reduced as far as possible.In view of these factors, in the present embodiment, adjustment unit 33 is according to two nets
Network, determines a compromise frequency deviation between the frequency deviation of two networks（Step 502）.So, two networks have a need
The residual frequency departure for wanting digital frequency deviation to adjust, this can be calculated in adjustment unit 33（Step 503）.The two residual frequency departures point
It is not the foundation of the first digital frequency deviation adjustment unit 34 and the adjustment of the second digital frequency deviation adjustment unit 35.In step 504, adjustment is single
The instruction that member 23 will be adjusted according to adjustment frequency deviation generation reference clock.
In two modes respectively exemplified by LTE and TD-SCDMA.At a time, adjusted based on traditional measurement and frequency deviation
Strategy, respectively obtaining needs the frequency deviation size adjusted to be respectively f0 and f1 in LTE system and TD-SCDMA system.It is preferably real one
Apply in example, the control word of adjustment reference clock generator 38 realizes adjustment and calibration to frequency deviation (f0+f1)/2.After adjustment, LTE
The residual frequency departure of pattern be (f0-f1)/2, and the frequency deviation of TD-SCDMA patterns residual be (f1-f0)/2, the two patterns it is residual
Frequency deviation is stayed to also need to be calibrated by the first digital frequency deviation adjustment unit 34 and the second digital frequency deviation adjustment unit 35 respectively
And adjustment（Step 505）.Obviously, compared to the mode based on a mode adjustment frequency deviation, needed in the preferred embodiment in number
The frequency deviation of word domain adjustment is only 1/2, and the frequency range that numeric field can be corrected is expanded twice.
It will be understood to those skilled in the art that various criterion may be different to the degrees of tolerance of frequency deviation, adjustment unit 33
During the control word of calculating benchmark clock generator 38, it is α * f0+ (1- α) * f1 to set adjustment frequency deviation.If frequency deviation is f0 pattern
It is more sensitive to frequency, α can be set to be more than 1/2；Otherwise α is set to be less than 1/2.α values are between [0,1].It is used as special case, α
Value is 0 or 1, then degenerates to previous embodiment.
In the preferred embodiment, adjustment submodule is ensureing two digital frequency deviation adjustment according to the output of measurement module
Frequency deviation in that larger adjustment frequency deviation the minimum criterion of absolute value under, the instruction of generation reference clock adjustment.Thus
Further expand tolerance of the system to the reference frequency deviation of two networks.
Above by it is double treat or bilateral terminal exemplified by describe the clock schemes treated or lead to terminal more more.It is easily understood that
For the terminal of more multi-communication mode, measuring unit, digital frequency deviation adjustment unit, radio frequency unit and antenna can be regard as one
Unit.Several communication patterns are needed, several foregoing units are just reconfigured at, and adjustment unit and reference clock generator are then more
Public between individual letter all, adjustment unit is connected with the measuring unit of all communication patterns and with digital frequency deviation adjustment unit,
Reference clock generator is connected with the radio frequency unit of all communication patterns.The clock scheme such as Fig. 4 constituted according to this design
It is shown.
Shown in reference picture 4, system includes the first radio frequency unit 49, the second radio frequency unit 50 and the 3rd radio frequency unit 51, point
Not Yong Yu three network wireless signals transmitting-receiving.However, system is only comprising reference clock generator 48, using including crystal oscillator
Circuit high precision reference clock is provided, and carried to the first radio frequency unit 49, the second radio frequency unit 50 and the 3rd radio frequency unit 51
For reference frequency.
In one embodiment, the first radio frequency unit 48 can be operated in LTE（Long Term Evolution）Pattern, and the second radio frequency unit 50
2G or 3G patterns, such as GSM/GPRS/EDGE, IS-95 (CDMA), CDMA2000, TD- can be operated in the 3rd radio frequency unit 51
One of SCDMA and WCDMA mode.
In one embodiment, reference clock generator 48 can provide typical 26MHz reference clock signals.But can manage
Solution, reference clock generator 48 can provide the clock signal under other frequencies as needed.The adjustment of the reference clock signal is same
When consider the first radio frequency unit 49, the second radio frequency unit 50 and the 3rd radio frequency unit 51 work network.
Digital baseband chip 40 is the basic element of character of terminal, for carrying out Digital Signal Processing, generates the number of up transmission
It is believed that number and receive the data-signal of downlink reception.In the present embodiment, digital baseband chip 40 is configured as further including
First measuring unit 41, the second measuring unit 42, the 3rd measuring unit 43, adjustment unit 44, the first digital frequency deviation adjustment unit
45th, the second digital frequency deviation adjustment unit 46 and the second digital frequency deviation adjustment unit 47.First measuring unit 41, the second measuring unit
42 and the 3rd measuring unit 43 be respectively used to measure the frequency deviations of three networks, and frequency deviation is exported to adjustment unit 44.Adjustment is single
When member 44 is used to generate benchmark according to the output signal of the first measuring unit 41, the second measuring unit 42 and the 3rd measuring unit 43
The adjust instruction of clock and the residual frequency departure size for needing digital frequency deviation to adjust.First digital frequency deviation adjustment unit the 45, second numeral frequency
The inclined digital frequency deviation adjustment unit 47 of adjustment unit 46 and the 3rd is respectively used to the residual frequency departure size inputted according to adjustment unit 44
In digital processing domain frequency deviation adjustment is carried out to sending or/and receiving signal.
First measuring unit 41, the second measuring unit 42 and the 3rd measuring unit 43 can respectively measure the frequency of a network
Partially.It will be understood to those skilled in the art that the frequency deviation measurement method for various criterion or network is had nothing in common with each other；For same
Standard, it is possibility to have a variety of frequency deviation measurement schemes.
It is described with the example that three networks are respectively gsm system, TD-SCDMA system and LTE system.At certain for the moment
Carve, based on conventional measurement and frequency deviation adjustable strategies, respectively obtain needs to adjust in gsm system, TD-SCDMA system and LTE system
Whole frequency deviation size is respectively f0, f1 and f2.Fig. 5 shows the frequency offset regulation method flow of one embodiment of the invention, incorporated by reference to ginseng
According to Fig. 4 and Fig. 5.
It is frequency deviation set-up procedure 501 first.In the first measuring unit 41, the second measuring unit 42 and the 3rd measuring unit 43
After the frequency deviation size for measuring each automatic network respectively, export to adjustment unit 44.Adjustment unit 44 can carry out frequency deviation adjustment accordingly.
Because the frequency deviation of three networks is different, it will be understood to those skilled in the art that adjustment nothing of the adjustment unit 44 to reference clock
Method meets the demand of three networks simultaneously.Simultaneously it will be understood to those skilled in the art that the frequency deviation adjusting range of numeric field has
One definite limitation, if frequency deviation is excessive, due to the limitation and influence of bandwidth/wave filter, receipt signal frequency spectrum can distort to influence
Performance.Accordingly, it would be desirable to reduce the size of numeric field frequency offset correction as far as possible.In view of these factors, in the present embodiment, adjustment is single
Member 44 will determine that a compromise between the frequency deviation of three networks adjusts frequency deviation according to three networks（Step 502）.This
Sample, three networks have a residual frequency departure for needing digital frequency deviation to adjust, and this can be calculated in adjustment unit 44（Step
503）.This residual frequency departure is the first digital frequency deviation adjustment unit 45, the second digital frequency deviation adjustment unit 46 and the second number respectively
The foundation that word frequency deviation adjustment unit 47 is adjusted.In step 504, adjustment unit 44 will be according to adjustment frequency deviation generation reference clock adjustment
Instruction.
So that three networks are respectively gsm system, TD-SCDMA system and LTE system as an example.At a time, based on tradition
Measurement and frequency deviation adjustable strategies, respectively obtain needed in gsm system, TD-SCDMA system and LTE system adjustment frequency deviation it is big
Small is respectively f0, f1 and f2.In one embodiment, adjustment reference clock generator 38 control word realize to frequency deviation (fa+fb)/
2 adjustment and calibration.In this fa, fb can be any two in f0, f1 and f2.But it is preferred that fa, fb are f0, f1 respectively
With the peak frequency and minimum frequency in f2.
After adjustment, the residual frequency departure of GSM mode is that the frequency deviation residual of (2f0-fa-fb)/2, TD-SCDMA patterns is (2f1-
Fa-fb the frequency deviation residual of)/2, LTE patterns is (2f2-fa-fb)/2.The residual frequency departure of these three patterns also needs to lead to respectively
Cross the first digital frequency deviation adjustment unit 45, the second digital frequency deviation adjustment unit 46 and the second digital frequency deviation adjustment unit 47 and carry out school
Accurate and adjustment（Step 505）.
It will be understood to those skilled in the art that various criterion may be different to the degrees of tolerance of frequency deviation, adjustment unit 33
During the control word of calculating benchmark clock generator 38, it is α * fa+ (1- α) * fb to set adjustment frequency deviation.If frequency deviation is fa pattern
It is more sensitive to frequency, α can be set to be more than 1/2；Otherwise α is set to be less than 1/2.α values are between [0,1].
As special case, α values are 0 or 1, then degenerate to the side that reference clock is adjusted only for the frequency under a pattern
Case, its embodiment is similar to embodiment illustrated in fig. 2.Those skilled in the art can draw three with reference to the embodiment easily
Corresponding scheme under network standby mode, therefore not reinflated description herein.
Although the present invention is disclosed as above with preferred embodiment, so it is not limited to the present invention, any this area skill
Art personnel, without departing from the spirit and scope of the present invention, when a little modification can be made and perfect, therefore the protection model of the present invention
Enclose when by being defined that claims are defined.
Claims (18)
1. a kind of treat more or lead to mobile terminal more, presence can be kept in multiple networks simultaneously, the mobile terminal includes：
Multiple radio frequency units, are respectively suitable for the plurality of network；
Reference clock generator, for producing the clock signal of reference frequency and being supplied to each radio frequency unit；
Multiple measuring units, are respectively used to measure frequency deviation of the mobile terminal under each network；
Adjustment unit, at least one based on multiple frequency deviations determines an adjustment frequency deviation, and adjusts reference clock hair accordingly
The reference frequency of raw device, and calculate at least one of residual frequency departure of the plurality of radio frequency unit after the adjustment；
At least one digital frequency deviation adjustment unit, it is residual to eliminate this for adjusting the radio frequency unit with residual frequency departure in numeric field
Stay frequency deviation.
2. as claimed in claim 1 treat more or lead to mobile terminal more, it is characterised in that the adjustment unit is to be based on the plurality of frequency
The first frequency deviation in partially determines the adjustment frequency deviation, and the adjustment frequency deviation can calibrate first frequency deviation completely, wherein first frequency deviation
The first radio frequency unit in the plurality of radio frequency unit of correspondence；After the calibration, the first radio frequency unit is removed in the plurality of radio frequency unit
Radio frequency unit in addition respectively have a residual frequency departure, and at least one digital frequency deviation adjustment unit numeric field adjust this first
Radio frequency unit beyond radio frequency unit is to eliminate each residual frequency departure.
3. as claimed in claim 1 treat more or lead to mobile terminal more, it is characterised in that the adjustment unit is to be based on the plurality of frequency
The first frequency deviation and the second frequency deviation in partially determine the adjustment frequency deviation, the adjustment frequency deviation at least can respectively partially calibrate this first
Frequency deviation and second frequency deviation, after the calibration, each radio frequency unit has a residual frequency departure, and at least one digital frequency deviation respectively
Adjustment unit adjusts each radio frequency unit to eliminate each residual frequency departure in numeric field respectively.
4. as claimed in claim 3 treat more or lead to mobile terminal more, it is characterised in that the adjustment frequency deviation is α * f0+ (1- α) *
F1, wherein f0 are first frequency deviation, and f1 is second frequency deviation, and α is the coefficient between (0,1).
5. as claimed in claim 4 treat more or lead to mobile terminal more, it is characterised in that first frequency deviation and second frequency deviation are
Any two in the plurality of frequency deviation.
6. as claimed in claim 4 treat more or lead to mobile terminal more, it is characterised in that first frequency deviation and second frequency deviation point
It is not the maximum frequency deviation and minimum frequency deviation in the plurality of frequency deviation.
7. as described in claim any one of 1-6 treat or led to more mobile terminal more, it is characterised in that the mobile terminal is treated to be double
Or bilateral mobile terminal.
8. as described in claim any one of 1-6 treat or led to more mobile terminal more, it is characterised in that the mobile terminal is three to treat
Or threeway mobile terminal.
9. as claimed in claim 1 treat more or lead to mobile terminal more, it is characterised in that the plurality of measuring unit, the adjustment list
Member and at least one digital frequency deviation adjustment unit are arranged in a digital baseband chip.
10. as claimed in claim 1 treated more or lead to mobile terminal more, it is characterised in that at least one digital frequency deviation is adjusted
Unit is corresponded with the radio frequency unit with residual frequency departure.
11. a kind of frequency offset regulation method treated or lead to mobile terminal more, this, and treat or lead to mobile terminal more can be simultaneously more more
Individual network keeps presence, and this method comprises the following steps：
Frequency deviation of the mobile terminal under multiple networks is measured respectively；
At least one based on multiple frequency deviations determines an adjustment frequency deviation；
The reference frequency of single reference clock generator is adjusted according to the adjustment frequency deviation, the single reference clock generator produces base
The clock signal of quasi- frequency and the multiple radio frequency units for being respectively supplied to the plurality of network of correspondence；
Calculate at least one of residual frequency departure of the plurality of radio frequency unit after the adjustment；And
Adjust the radio frequency unit with residual frequency departure to eliminate the residual frequency departure in numeric field.
12. method as claimed in claim 11, it is characterised in that at least one based on the plurality of frequency deviation determines a tune
The step of whole frequency deviation, includes：The adjustment frequency deviation is determined based on the first frequency deviation in the plurality of frequency deviation, the adjustment frequency deviation can be complete
Calibrate first frequency deviation, wherein the first radio frequency unit in the plurality of radio frequency unit of first frequency deviation correspondence；
Wherein after the calibration, the radio frequency unit in the plurality of radio frequency unit in addition to the first radio frequency unit respectively has a residual frequency
Partially, included in radio frequency unit of the numeric field adjustment with residual frequency departure with eliminating the step of the residual frequency departure：Adjusted in numeric field
Radio frequency unit beyond whole first radio frequency unit is to eliminate each residual frequency departure.
13. method as claimed in claim 11, it is characterised in that at least one based on the plurality of frequency deviation determines a tune
The step of whole frequency deviation, includes：The adjustment frequency deviation, adjustment frequency are determined based on the first frequency deviation and the second frequency deviation in the plurality of frequency deviation
First frequency deviation and second frequency deviation can respectively partially be calibrated less by being biased to；
Wherein after the calibration, each radio frequency unit has a residual frequency departure respectively, and is adjusted in numeric field with residual frequency departure
Radio frequency unit is included with eliminating the step of the residual frequency departure：Each radio frequency unit is adjusted in numeric field respectively to eliminate each residual frequency
Partially.
14. method as claimed in claim 13, it is characterised in that the adjustment frequency deviation is α * f0+ (1- α) * f1, and wherein f0 is should
First frequency deviation, f1 is second frequency deviation, and α is the coefficient between (0,1).
15. method as claimed in claim 14, it is characterised in that during first frequency deviation and second frequency deviation are the plurality of frequency deviation
Any two.
16. method as claimed in claim 14, it is characterised in that first frequency deviation and second frequency deviation are the plurality of frequency respectively
Maximum frequency deviation and minimum frequency deviation in partially.
17. the method as described in claim any one of 11-16, it is characterised in that the mobile terminal is treated or bilateral movement to be double
Terminal.
18. the method as described in claim any one of 11-16, it is characterised in that the mobile terminal is treated or threeway movement for three
Terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210324174.4A CN103686981B (en) | 2012-09-04 | 2012-09-04 | It is treat or lead to mobile terminal and its frequency offset regulation method more more |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210324174.4A CN103686981B (en) | 2012-09-04 | 2012-09-04 | It is treat or lead to mobile terminal and its frequency offset regulation method more more |
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| CN103686981B true CN103686981B (en) | 2017-07-25 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106155178B (en) * | 2015-04-14 | 2019-05-31 | 深圳市中兴微电子技术有限公司 | A kind of multimode terminal and its automatic frequency control switching method |
| CN111614373B (en) * | 2020-05-20 | 2021-08-10 | 北京升哲科技有限公司 | Spread spectrum signal transmission method, spread spectrum signal reception method, spread spectrum signal transmission device, spread spectrum signal reception device, and spread spectrum signal reception medium |
| CN115833987B (en) * | 2023-01-09 | 2023-05-02 | 北京智芯微电子科技有限公司 | Initial frequency offset calibration method and system for multi-band multi-network coexistence scene |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101754468A (en) * | 2008-12-18 | 2010-06-23 | 展讯通信（上海）有限公司 | Mobile terminal and clock design method for mobile terminal |
| CN102045082A (en) * | 2009-10-12 | 2011-05-04 | 展讯通信（上海）有限公司 | Control method of dual-standby terminal and AFC (automatic frequency control) loop of dual-standby terminal |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7912497B2 (en) * | 2005-03-25 | 2011-03-22 | Isidore Eustace P | Single wireless communication device with multiple, concurrent subscriber number capability |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101754468A (en) * | 2008-12-18 | 2010-06-23 | 展讯通信（上海）有限公司 | Mobile terminal and clock design method for mobile terminal |
| CN102045082A (en) * | 2009-10-12 | 2011-05-04 | 展讯通信（上海）有限公司 | Control method of dual-standby terminal and AFC (automatic frequency control) loop of dual-standby terminal |
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