CN103686981A - Multi-standby or multi-pass mobile terminal and frequency deviation adjusting method thereof - Google Patents
Multi-standby or multi-pass mobile terminal and frequency deviation adjusting method thereof Download PDFInfo
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- CN103686981A CN103686981A CN201210324174.4A CN201210324174A CN103686981A CN 103686981 A CN103686981 A CN 103686981A CN 201210324174 A CN201210324174 A CN 201210324174A CN 103686981 A CN103686981 A CN 103686981A
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Abstract
The invention relates to a multi-standby or multi-pass mobile terminal which only adopts a single reference clock generator. The mobile terminal comprises a plurality of RFU (Radio Frequency Units), the reference clock generator, a plurality of measuring units, an adjusting unit and at least one digital frequency deviation adjusting unit, wherein the RFUs are applied to a plurality of networks respectively; the reference clock generator is used for generating clock signals with a reference frequency and providing the clock signals for all the RFUs; the measuring units are used for measuring the frequency deviations, under the networks, of the mobile terminal respectively; the adjusting unit is used for determining an adjustment frequency deviation on the basis of at least one of the frequency deviations, adjusting the reference frequency of the reference clock generator according to the adjustment frequency deviation, and calculating the residual frequency deviation of at least one of the adjusted RFUs; the digital frequency deviation adjusting unit is used for adjusting the RFU with the residual frequency deviation in a digital domain so as to eliminate the residual frequency deviation.
Description
Technical field
The present invention relates to move on to communication terminal, especially relate to the frequency offset regulation method for the treatment of more or leading to mobile terminal more.
Background technology
The fast development of mobile communication makes different communication standard simultaneously and deposits, and the mobile communication standard of main flow just comprises GSM/GPRS/EDGE, IS-95 (CDMA), CDMA2000, TD-SCDMA, WCDMA, LTE TDD and LTE FDD etc. at present.In this case, to the terminal of supporting that a plurality of networks are simultaneously online, the demand of multi-standby terminal or bilateral terminal also increases thereupon.
In multi-standby terminal, the standard of a plurality of networks can be identical or different.Take double-standby terminal or bilateral terminal is example, and two networks can be for adhering to the GSM network of two different operators separately, can be also two networks that this standard of GSM, LTE is different.Double-standby terminal General Requirements terminal simultaneously keeps holding states at two networks, but and do not require that two networks carry out business simultaneously, and bilateral terminal also can further be supported in two networks and carries out business simultaneously.From the working method of terminal data transmitting-receiving, double-standby terminal may need in two networks, to receive data simultaneously, but synchronization only sends data in one network; And bilateral terminal receives data except being supported in two networks simultaneously, also support in two networks, to send data simultaneously.It should be noted that, according to choosing of radio frequency chip, double-standby terminal also may adopt the mode of time-sharing multiplex only in a network, to receive data at synchronization.But in the context of the present invention, double-standby terminal represents that needs collect the terminal of data (beep-page message etc.) in two networks simultaneously.
In order to guarantee the normal transmitting-receiving of data, when terminal is normally worked, be all to provide reference frequency by a high-precision crystal oscillator, and produce and the synchronous local oscillation signal of network holding frequency based on this reference frequency.For example, terminal is generally used 26MHz reference clock at present.Frequency Synchronization, generally by crystal oscillator being adjusted to realization, also realizes by adjusting 26MHz reference clock.Cause the reason of frequency departure a lot, for example: network side base station itself exists frequency error, the Doppler frequency deviation causing due to fast mobile terminal, the frequency departure causing due to variations in temperature and crystal oscillator self character.It is different that these factors cause the reference frequency of working in heterogeneous networks, and the reference frequency of heterogeneous networks and the variation of frequency are independent mutually.
The general reference frequency of using two crystal oscillators that heterogeneous networks is provided respectively of current double-standby terminal or bilateral terminal, and the frequency producing facing to two crystal oscillators is carried out independence control and adjusts.As shown in Figure 1, two reference clock generators 13,14 are respectively used a crystal oscillator to produce a set of reference clock to the clock scheme of existing typical double-standby terminal or bilateral terminal.This two covers reference clock provides reference frequency for the first radio frequency unit 15, the second radio frequency unit 16 under two heterogeneous networks.Digital baseband chip 10 comprises two to be measured and adjustment unit 11,12, can independently control two reference clock generators 13,14 to adjust respectively the reference frequency of two networks.But this scheme need to be used a plurality of crystal oscillators, increased terminal and realized cost and complexity.
Summary of the invention
An object of the present invention is to provide a kind of treat or logical terminal how more, only need provide reference frequency with single reference clock generator.
Another object of the present invention is to provide a kind of treat or the frequency offset regulation method of logical terminal how more, based on single reference clock generator, provides reference frequency.
The present invention is that to solve the problems of the technologies described above the technical scheme adopting be a kind of treat or logical mobile terminal how more, and can at a plurality of networks, remain on line states, this mobile terminal comprises: a plurality of radio frequency units, are applicable to respectively the plurality of network simultaneously; Reference clock generator, for generation of the clock signal of reference frequency and offer each radio frequency unit; A plurality of measuring units, are respectively used to measure the frequency deviation of mobile terminal under each network; Adjustment unit, based on a plurality of frequency deviations at least one of them determines an adjustment frequency deviation, and adjust accordingly the reference frequency of this reference clock generator, and calculate at least residual frequency departure of one of them of the plurality of radio frequency unit after this is adjusted; And at least one digital frequency deviation adjustment unit, for the radio frequency unit in numeric field adjustment with residual frequency departure to eliminate this residual frequency departure.
In one embodiment of this invention, this adjustment unit is that the first frequency deviation based in the plurality of frequency deviation determines this adjustment frequency deviation, and this adjustment frequency deviation can be calibrated this first frequency deviation completely, wherein the first radio frequency unit in the corresponding the plurality of radio frequency unit of this first frequency deviation; After this calibration, the radio frequency unit in the plurality of radio frequency unit except the first radio frequency unit respectively has a residual frequency departure, and the radio frequency unit of this at least one digital frequency deviation adjustment unit beyond numeric field is adjusted this first radio frequency unit is to eliminate each residual frequency departure.
In one embodiment of this invention, this adjustment unit is that the first frequency deviation and the second frequency deviation based in the plurality of frequency deviation determines this adjustment frequency deviation, this adjustment frequency deviation at least can partly be calibrated respectively this first frequency deviation and this second frequency deviation, after this calibration, each radio frequency unit has respectively a residual frequency departure, and this at least one digital frequency deviation adjustment unit is adjusted each radio frequency unit to eliminate each residual frequency departure at numeric field respectively.
In one embodiment of this invention, this adjustment frequency deviation is α * f0+ (1-α) * f1, and wherein f0 is this first frequency deviation, and f1 is this second frequency deviation, and α is the coefficient between (0,1).
In one embodiment of this invention, this first frequency deviation and this second frequency deviation are any two in the plurality of frequency deviation.
In one embodiment of this invention, this first frequency deviation and this second frequency deviation are respectively maximum frequency deviation and the minimum frequency deviations in the plurality of frequency deviation.
In one embodiment of this invention, this mobile terminal is treated or bilateral mobile terminal for two.
In one embodiment of this invention, this mobile terminal is three to treat or threeway mobile terminal.
In one embodiment of this invention, the plurality of measuring unit, this adjustment unit and this at least one digital frequency deviation adjustment unit are to be disposed in a digital baseband chip.
In one embodiment of this invention, this at least one digital frequency deviation adjustment unit is corresponding one by one with the radio frequency unit with residual frequency departure.
A kind of frequency offset regulation methods for the treatment of or leading to mobile terminal more of the another proposition of the present invention more, this treats more or how logical mobile terminal can remain on line states at a plurality of networks simultaneously, and the method comprises the following steps: measure respectively the frequency deviation of mobile terminal under a plurality of networks; Based on a plurality of frequency deviations at least one of them determines an adjustment frequency deviation; According to this adjustment frequency deviation, adjust the reference frequency of single reference clock generator, this single reference clock generator produces the clock signal of reference frequency and offers respectively a plurality of radio frequency units of corresponding the plurality of network; At least residual frequency departure of one of them of calculating the plurality of radio frequency unit after this is adjusted; And the radio frequency unit in numeric field adjustment with residual frequency departure is to eliminate this residual frequency departure.
In one embodiment of this invention, based on the plurality of frequency deviation at least one of them determines that the step of an adjustment frequency deviation comprises: the first frequency deviation based in the plurality of frequency deviation determines this adjustment frequency deviation, this adjustment frequency deviation can be calibrated this first frequency deviation completely, wherein the first radio frequency unit in the corresponding the plurality of radio frequency unit of this first frequency deviation; Wherein after this calibration, radio frequency unit in the plurality of radio frequency unit except the first radio frequency unit respectively has a residual frequency departure, and the radio frequency unit in numeric field adjustment with residual frequency departure comprises to eliminate the step of this residual frequency departure: the radio frequency unit beyond numeric field is adjusted this first radio frequency unit is to eliminate each residual frequency departure.
In one embodiment of this invention, based on the plurality of frequency deviation at least one of them determines that the step of an adjustment frequency deviation comprises: the first frequency deviation based in the plurality of frequency deviation and the second frequency deviation determine this adjustment frequency deviation, and this adjustment frequency deviation at least can partly be calibrated respectively this first frequency deviation and this second frequency deviation; Wherein, after this calibration, each radio frequency unit has respectively a residual frequency departure, and the radio frequency unit in numeric field adjustment with residual frequency departure comprises to eliminate the step of this residual frequency departure: at numeric field, adjust each radio frequency unit to eliminate each residual frequency departure respectively.
In one embodiment of this invention, this adjustment frequency deviation is α * f0+ (1-α) * f1, and wherein f0 is this first frequency deviation, and f1 is this second frequency deviation, and α is the coefficient between (0,1).
In one embodiment of this invention, this first frequency deviation and this second frequency deviation are any two in the plurality of frequency deviation.
In one embodiment of this invention, this first frequency deviation and this second frequency deviation are respectively maximum frequency deviation and the minimum frequency deviations in the plurality of frequency deviation.
In one embodiment of this invention, this mobile terminal is treated or bilateral mobile terminal for two.
In one embodiment of this invention, this mobile terminal is three to treat or threeway mobile terminal.
The present invention, owing to adopting above technical scheme, makes it compared with prior art, and the present invention only needs single reference clock generator, has therefore saved the cost of product.
Accompanying drawing explanation
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 illustrate existing two treat or bilateral terminal in clock scheme schematic diagram.
Fig. 2 illustrates one embodiment of the invention two treat or bilateral terminal in clock scheme schematic diagram.
Fig. 3 illustrates another embodiment of the present invention two treat or bilateral terminal in clock scheme schematic diagram.
Fig. 4 illustrates treating of further embodiment of this invention more or leads to the clock scheme schematic diagram in terminal more.
Fig. 5 illustrates the frequency offset regulation method flow process of one embodiment of the invention.
Embodiment
Basic thought of the present invention is, uses a set of high precision reference clock to realize to treat/lead to terminal more more, and the frequency shift (FS) producing due to the difference of this cover reference clock and network reference clock is calibrated when data processing.Can save so a set of high precision reference clock system (crystal oscillator/crystal), thereby can reduce terminal, realize cost, improve the market competitiveness.
Fig. 2 illustrates one embodiment of the invention two treat or bilateral terminal in clock scheme schematic diagram.In the present embodiment, terminal can be the electronic equipment such as mobile phone, panel computer, notebook computer with mobile communication function.Shown in Fig. 2, system comprises the first radio frequency unit 25 and the second radio frequency unit 26, is respectively used to the transmitting-receiving of two network wireless signals.Yet system only comprises a reference clock generator 27, utilize the circuit that comprises crystal oscillator that high precision reference clock is provided, and provide reference frequency to the first radio frequency unit 25 and the second radio frequency unit 26.
In one embodiment, the first radio frequency unit 25 and the second radio frequency unit 26 can be operated in LTE(Long Term Evolution separately) under pattern, 2G or 3G pattern.2G or 3G pattern are for example GSM/GPRS/EDGE, IS-95 (CDMA), CDMA2000, TD-SCDMA and WCDMA pattern.
In one embodiment, reference clock generator 27 can provide typical 26MHz reference clock signal.Yet be appreciated that reference clock generator 27 can provide the clock signal under other frequency as required.This reference clock signal is with one of them radio frequency unit in the first radio frequency unit 25 and the second radio frequency unit 26, and for example the network of the first radio frequency unit 25 work is that benchmark is adjusted.
The first measuring unit 21 and the second measuring unit 22 can respectively be measured the frequency deviation of a network.Those skilled in the art will appreciate that for the frequency deviation measurement method of various criterion or network and have nothing in common with each other; For same standard, also can there is multiple frequency deviation measurement scheme.For example, in one embodiment of this invention, two networks are respectively gsm system and TD-SCDMA system, in gsm system, can realize frequency deviation measurement by the phase deviation of comparing received training sequence and send between training sequence, can be by utilizing the data symbol of joint-detection output realize frequency deviation measurement in TD-SCDMA system.In another embodiment of the present invention, one of them network is used LTE system, and the frequency deviation measurement in LTE system is carried out based on reference signal (Reference Signal, RS).
The example that is still respectively gsm system and TD-SCDMA system with two networks is described.At a time, the measurement based on conventional and frequency deviation are adjusted strategy, and obtaining respectively needs the frequency deviation size of adjustment to be respectively f0 and f1 in gsm system and TD-SCDMA system.Fig. 5 illustrates the frequency offset regulation method flow process of one embodiment of the invention, incorporated by reference to reference to Fig. 2 and Fig. 5.
First be frequency deviation measurement step 501.At the first measuring unit 21 and the second measuring unit 22, measure respectively after the frequency deviation size of each automatic network, export to adjustment unit 23.Adjustment unit 23 can carry out frequency deviation adjustment accordingly.Because the frequency deviation of two networks is different, those skilled in the art will appreciate that the adjustment of 23 pairs of reference clocks of adjustment unit cannot meet the demand of two networks simultaneously.In the present embodiment, adjustment unit 23 can determine take that one of them network decides an adjustment frequency deviation (step 502) as benchmark.As step 503, adjustment unit 23 calculates the residual frequency departure of another network according to the reference frequency difference of two networks, and this residual frequency departure is the foundation that digital frequency deviation adjustment unit 24 is adjusted.In step 504, adjustment unit 23 will generate the instruction that reference clock is adjusted according to adjusting frequency deviation.
For example, adjustment unit 23 be take gsm system as master network, and the measurement based on gsm system and frequency deviation are adjusted strategy, and the control word of adjusting reference clock generator 27 realizes the adjustment of frequency deviation f0 and calibration.After adjustment, GSM pattern has reached the Frequency Synchronization with network, and the frequency deviation that TD-SCDMA pattern is adjusted due to needs is different with GSM, also the frequency deviation of residual f1-f0 size is not adjusted, and this residual frequency departure also needs to be calibrated and adjusted by digital frequency deviation adjustment unit 24.The residual frequency departure of TD-SCDMA pattern both may be greater than its original frequency deviation f1, also may be less than its original frequency deviation f1.
As step 505,24 of digital frequency deviation adjustment are further carried out frequency deviation adjustment to sending or/and receive signal in digital processing territory according to this residual frequency departure.Those skilled in the art will appreciate that frequency deviation shows as a linear phase deviation at numeric field, so the frequency offset correction of numeric field can be realized by correcting phase deviation.For example, when two networks are respectively GSM and TD-SCDMA, take GSM as master network, the frequency offset correction of numeric field carries out for TD-SCDMA network.
In a preferred embodiment, digital frequency deviation adjustment unit 24 can be further divided into two submodules: upstream digital compensate of frequency deviation module and descending digital compensate of frequency deviation module, realize respectively digital compensate of frequency deviation and the calibration of uplink and downlink data.Those skilled in the art will appreciate that when specific implementation, the compensate of frequency deviation of numeric field and calibration can, by the sampled signal of time domain discrete is carried out to phase rotating realization, not describe in detail at this.
Because the frequency deviation adjusting range in digital processing territory has certain limitation, therefore, in another embodiment of the present invention, in order to increase frequency adjustment range, further increase a digital frequency deviation adjustment unit.Like this, two networks will be distinguished a corresponding digital frequency deviation adjustment unit.
Fig. 3 illustrates another embodiment of the present invention two treat or bilateral terminal in clock scheme schematic diagram.Shown in Fig. 3, system comprises 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.Yet system only comprises a reference clock generator 38, utilize the circuit that comprises crystal oscillator that high precision reference clock is provided, and provide reference frequency to the first radio frequency unit 36 and the second radio frequency unit 37.
In one embodiment, the first radio frequency unit 36 and the second radio frequency unit 37 can be operated in LTE(Long Term Evolution) under pattern, 2G or 3G pattern.2G or 3G pattern are for example GSM/GPRS/EDGE, IS-95 (CDMA), CDMA2000, TD-SCDMA and WCDMA pattern.
In one embodiment, reference clock generator 38 can provide typical 26MHz reference clock signal.Yet be appreciated that reference clock generator 38 can provide the clock signal under other frequency as required.The network of the first radio frequency unit 36 and the second radio frequency unit 37 work has been considered in the adjustment of this reference clock signal simultaneously.
Digital baseband chip 30 is basic elements of character of terminal, for carrying out Digital Signal Processing, generates the data-signal of up transmission and receives the data-signal of descending reception.In the present embodiment, digital baseband chip 30 is configured to further comprise the first measuring unit 31, the second measuring unit 32, the digital frequency deviation adjustment unit 34 of adjustment unit 33, first and the second digital frequency deviation adjustment unit 35.The first measuring unit 31 and the second measuring unit 32 are respectively used to measure the frequency deviation of two networks, and frequency deviation is exported to adjustment unit 33.The residual frequency departure size of adjustment unit 33 for generating the adjustment instruction of reference clock according to the output signal of the first measuring unit 31, the second measuring unit 32 and needing digital frequency deviation to adjust.The first digital frequency deviation adjustment unit 34 and the second digital frequency deviation adjustment unit 35 are respectively used in digital processing territory, to sending, or/and receive signal, carry out frequency deviation adjustment according to the residual frequency departure size of adjustment unit 33 inputs.
The first measuring unit 31 and the second measuring unit 32 can respectively be measured the frequency deviation of a network.Those skilled in the art will appreciate that for the frequency deviation measurement method of various criterion or network and have nothing in common with each other; For same standard, also can there is multiple frequency deviation measurement scheme.For example, in one embodiment of this invention, two networks are respectively gsm system and TD-SCDMA system, in gsm system, can realize frequency deviation measurement by the phase deviation of comparing received training sequence and send between training sequence, can be by utilizing the data symbol of joint-detection output realize frequency deviation measurement in TD-SCDMA system.In another embodiment of the present invention, one of them network is used LTE system, and the frequency deviation measurement in LTE system is carried out based on reference signal (Reference Signal, RS).
The example that is still respectively gsm system and TD-SCDMA system with two networks is described.At a time, the measurement based on conventional and frequency deviation are adjusted strategy, and obtaining respectively needs the frequency deviation size of adjustment to be respectively f0 and f1 in gsm system and TD-SCDMA system.Fig. 5 illustrates the frequency offset regulation method flow process of one embodiment of the invention, incorporated by reference to reference to Fig. 3 and Fig. 5.
First be the step 501 of measuring frequency deviation, at the first measuring unit 31 and the second measuring unit 32, measure respectively after the frequency deviation size of each automatic network, export to adjustment unit 33.Adjustment unit 33 can carry out frequency deviation adjustment accordingly.Because the frequency deviation of two networks is different, those skilled in the art will appreciate that the adjustment of 33 pairs of reference clocks of adjustment unit cannot meet the demand of two networks simultaneously.The frequency deviation adjusting range that simultaneously those skilled in the art will appreciate that numeric field has certain limitation, if frequency deviation is excessive, due to restriction and the impact of bandwidth/filter, thereby receive signal spectrum, can distorts and affects performance.Therefore, need to reduce the size of numeric field frequency offset correction as far as possible.Consider these factors, in the present embodiment, adjustment unit 33, according to two networks, determines a compromise frequency deviation (step 502) between the frequency deviation of two networks.Like this, two residual frequency departures that network has a needs numeral frequency deviation to adjust, this can calculate (step 503) in adjustment unit 33.These two residual frequency departures are respectively the foundations that the first digital frequency deviation adjustment unit 34 and the second digital frequency deviation adjustment unit 35 are adjusted.In step 504, adjustment unit 23 will generate the instruction that reference clock is adjusted according to adjusting frequency deviation.
Two patterns of take are respectively LTE and TD-SCDMA is example.At a time, the measurement based on traditional and frequency deviation are adjusted strategy, and obtaining respectively needs the frequency deviation size of adjustment to be respectively f0 and f1 in LTE system and TD-SCDMA system.In a preferred embodiment, the control word of adjusting reference clock generator 38 realizes adjustment and the calibration to frequency deviation (f0+f1)/2.After adjustment, the residual frequency departure of LTE pattern is (f0-f1)/2, and the frequency deviation of TD-SCDMA pattern residual be (f1-f0)/2, the residual frequency departure of these two patterns all also needs by the first digital frequency deviation adjustment unit 34 and the second digital frequency deviation adjustment unit 35, to calibrate and adjust (step 505) respectively.Obviously, compared to the mode based on a mode adjustment frequency deviation, in this preferred embodiment, need to be only 1/2 in the frequency deviation of numeric field adjustment, the frequency range that numeric field can be proofreaied and correct has expanded twice.
Those skilled in the art will appreciate that various criterion may be different to the degrees of tolerance of frequency deviation, when adjustment unit 33 calculates the control word of reference clock generator 38, arranging and adjusting frequency deviation is α * f0+ (1-α) * f1.If the pattern that frequency deviation is f0 is more responsive to frequency ratio, α can be set and be greater than 1/2; Otherwise α is set and is less than 1/2.α value is between [0,1].As special case, α value is 0 or 1, degenerates to last embodiment.
In this preferred embodiment, adjust submodule according to the output of measurement module, in guaranteeing the frequency deviation that two digital frequency deviations are adjusted, under the criterion of the absolute value minimum of that larger adjustment frequency deviation, generate the instruction that reference clock is adjusted.So just further expanded the tolerance of this system to the reference frequency deviation of two networks.
Take two treat or bilateral terminal has been described and treated or the clock scheme of logical terminal how more as example above.Hold intelligible, for the terminal of multi-communication mode more, can be using measuring unit, digital frequency deviation adjustment unit, radio frequency unit and antenna as Yi Ge unit.Need several communication patterns, just configure again several aforesaid units, adjustment unit and reference clock generator are a plurality of all public between letter, the measuring unit of adjustment unit and all communication patterns and being connected with digital frequency deviation adjustment unit, the radio frequency unit of reference clock generator and all communication patterns is connected.The clock scheme forming according to this design as shown in Figure 4.
Shown in Fig. 4, system comprises the first radio frequency unit 49, the second radio frequency unit 50 and the 3rd radio frequency unit 51, is respectively used to the transmitting-receiving of three network wireless signals.Yet system only comprises a reference clock generator 48, utilize the circuit that comprises crystal oscillator that high precision reference clock is provided, and provide reference frequency to the first radio frequency unit 49, the second radio frequency unit 50 and the 3rd radio frequency unit 51.
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 and the 3rd radio frequency unit 51 can be operated in 2G or 3G pattern, for example one of GSM/GPRS/EDGE, IS-95 (CDMA), CDMA2000, TD-SCDMA and WCDMA pattern.
In one embodiment, reference clock generator 48 can provide typical 26MHz reference clock signal.Yet be appreciated that reference clock generator 48 can provide the clock signal under other frequency as required.The network of the first radio frequency unit 49, the second radio frequency unit 50 and the 3rd radio frequency unit 51 work has been considered in the adjustment of this reference clock signal simultaneously.
The first measuring unit 41, the second measuring unit 42 and the 3rd measuring unit 43 can respectively be measured the frequency deviation of a network.Those skilled in the art will appreciate that for the frequency deviation measurement method of various criterion or network and have nothing in common with each other; For same standard, also can there is multiple frequency deviation measurement scheme.
The example that is respectively gsm system, TD-SCDMA system and LTE system with three networks is described.At a time, the measurement based on conventional and frequency deviation are adjusted strategy, and obtaining respectively needs the frequency deviation size of adjustment to be respectively f0, f1 and f2 in gsm system, TD-SCDMA system and LTE system.Fig. 5 illustrates the frequency offset regulation method flow process of one embodiment of the invention, incorporated by reference to reference to Fig. 4 and Fig. 5.
First be frequency deviation set-up procedure 501.At the first measuring unit 41, the second measuring unit 42 and the 3rd measuring unit 43, measure respectively after the frequency deviation size of each automatic network, export to adjustment unit 44.Adjustment unit 44 can carry out frequency deviation adjustment accordingly.Because the frequency deviation of three networks is different, those skilled in the art will appreciate that the adjustment of 44 pairs of reference clocks of adjustment unit cannot meet the demand of three networks simultaneously.The frequency deviation adjusting range that simultaneously those skilled in the art will appreciate that numeric field has certain limitation, if frequency deviation is excessive, due to restriction and the impact of bandwidth/filter, thereby receive signal spectrum, can distorts and affects performance.Therefore, need to reduce the size of numeric field frequency offset correction as far as possible.Consider these factors, in the present embodiment, adjustment unit 44, according to three networks, will determine a compromise adjustment frequency deviation (step 502) between the frequency deviation of three networks.Like this, three residual frequency departures that network has a needs numeral frequency deviation to adjust, this can calculate (step 503) in adjustment unit 44.This residual frequency departure is respectively the foundation that the first digital frequency deviation adjustment unit 46 of digital frequency deviation adjustment unit 45, second and the second digital frequency deviation adjustment unit 47 are adjusted.In step 504, adjustment unit 44 will generate the instruction that reference clock is adjusted according to adjusting frequency deviation.
It is example that three networks of take are respectively gsm system, TD-SCDMA system and LTE system.At a time, the measurement based on traditional and frequency deviation are adjusted strategy, and obtaining respectively needs the frequency deviation size of adjustment to be respectively f0, f1 and f2 in gsm system, TD-SCDMA system and LTE system.In one embodiment, the control word of adjusting reference clock generator 38 realizes adjustment and the calibration to frequency deviation (fa+fb)/2.At this fa, fb can be f0, in f1 and f2 any two.But preferably, fa, fb is respectively f0, the peak frequency in f1 and f2 and minimum frequency.
After adjustment, the residual frequency departure of GSM pattern is (2f0-fa-fb)/2, and the frequency deviation of TD-SCDMA pattern is residual is (2f1-fa-fb)/2, and the frequency deviation of LTE pattern is residual is (2f2-fa-fb)/2.The residual frequency departure of these three patterns all also needs by the first digital frequency deviation adjustment unit 46 of digital frequency deviation adjustment unit 45, second and the second digital frequency deviation adjustment unit 47, to calibrate and adjust (step 505) respectively.
Those skilled in the art will appreciate that various criterion may be different to the degrees of tolerance of frequency deviation, when adjustment unit 33 calculates the control word of reference clock generator 38, arranging and adjusting frequency deviation is α * fa+ (1-α) * fb.If the pattern that frequency deviation is fa is more responsive to frequency ratio, α can be set and be greater than 1/2; Otherwise α is set and is less than 1/2.α value is between [0,1].
As special case, α value is 0 or 1, degenerates to the scheme of only adjusting reference clock for the frequency under a pattern, and its embodiment is similar to embodiment illustrated in fig. 2.Those skilled in the art can draw the corresponding scheme under three network standby modes with reference to this embodiment easily, therefore at this, no longer launch to describe.
Although the present invention discloses as above with preferred embodiment; so it is not in order to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little modification and perfect, so protection scope of the present invention is worked as with being as the criterion that claims were defined.
Claims (18)
1., treat more or lead to a mobile terminal more, can at a plurality of networks, remain on line states, this mobile terminal comprises simultaneously:
A plurality of radio frequency units, are applicable to respectively the plurality of network;
Reference clock generator, for generation of the clock signal of reference frequency and offer each radio frequency unit;
A plurality of measuring units, are respectively used to measure the frequency deviation of mobile terminal under each network;
Adjustment unit, based on a plurality of frequency deviations at least one of them determines an adjustment frequency deviation, and adjust accordingly the reference frequency of this reference clock generator, and calculate at least residual frequency departure of one of them of the plurality of radio frequency unit after this is adjusted;
At least one digital frequency deviation adjustment unit, for the radio frequency unit in numeric field adjustment with residual frequency departure to eliminate this residual frequency departure.
2. treat or logical mobile terminal how as claimed in claim 1 more, it is characterized in that, this adjustment unit is that the first frequency deviation based in the plurality of frequency deviation determines this adjustment frequency deviation, this adjustment frequency deviation can be calibrated this first frequency deviation completely, wherein the first radio frequency unit in the corresponding the plurality of radio frequency unit of this first frequency deviation; After this calibration, the radio frequency unit in the plurality of radio frequency unit except the first radio frequency unit respectively has a residual frequency departure, and the radio frequency unit of this at least one digital frequency deviation adjustment unit beyond numeric field is adjusted this first radio frequency unit is to eliminate each residual frequency departure.
3. treat or logical mobile terminal how as claimed in claim 1 more, it is characterized in that, this adjustment unit is that the first frequency deviation and the second frequency deviation based in the plurality of frequency deviation determines this adjustment frequency deviation, this adjustment frequency deviation at least can partly be calibrated respectively this first frequency deviation and this second frequency deviation, after this calibration, each radio frequency unit has respectively a residual frequency departure, and this at least one digital frequency deviation adjustment unit is adjusted each radio frequency unit to eliminate each residual frequency departure at numeric field respectively.
4. treat or logical mobile terminal how as claimed in claim 3 more, it is characterized in that, this adjustment frequency deviation is α * f0+ (1-α) * f1, and wherein f0 is this first frequency deviation, and f1 is this second frequency deviation, and α is the coefficient between (0,1).
5. treat or logical mobile terminal how as claimed in claim 4, it is characterized in that, this first frequency deviation and this second frequency deviation are any two in the plurality of frequency deviation more.
6. treat or logical mobile terminal how as claimed in claim 4, it is characterized in that, this first frequency deviation and this second frequency deviation are respectively maximum frequency deviation and the minimum frequency deviations in the plurality of frequency deviation more.
7. treating more or leading to mobile terminal more as described in claim 1-6 any one, is characterized in that, this mobile terminal is two treating or bilateral mobile terminal.
8. treating or logical mobile terminal how as described in claim 1-6 any one, is characterized in that more, and this mobile terminal is three to treat or threeway mobile terminal.
9. treat or logical mobile terminal how as claimed in claim 1, it is characterized in that, the plurality of measuring unit, this adjustment unit and this at least one digital frequency deviation adjustment unit are to be disposed in a digital baseband chip more.
10. treat or logical mobile terminal how as claimed in claim 1, it is characterized in that, this at least one digital frequency deviation adjustment unit is corresponding one by one with the radio frequency unit with residual frequency departure more.
11. 1 kinds, treat more or lead to more the frequency offset regulation method of mobile terminal, this treats more or how logical mobile terminal can remain on line states at a plurality of networks simultaneously, and the method comprises the following steps:
Measure respectively the frequency deviation of mobile terminal under a plurality of networks;
Based on a plurality of frequency deviations at least one of them determines an adjustment frequency deviation;
According to this adjustment frequency deviation, adjust the reference frequency of single reference clock generator, this single reference clock generator produces the clock signal of reference frequency and offers respectively a plurality of radio frequency units of corresponding the plurality of network;
At least residual frequency departure of one of them of calculating the plurality of radio frequency unit after this is adjusted; And
In numeric field adjustment, there is the radio frequency unit of residual frequency departure to eliminate this residual frequency departure.
12. methods as claimed in claim 11, it is characterized in that, based on the plurality of frequency deviation at least one of them determines that the step of an adjustment frequency deviation comprises: the first frequency deviation based in the plurality of frequency deviation determines this adjustment frequency deviation, this adjustment frequency deviation can be calibrated this first frequency deviation completely, wherein the first radio frequency unit in the corresponding the plurality of radio frequency unit of this first frequency deviation;
Wherein after this calibration, radio frequency unit in the plurality of radio frequency unit except the first radio frequency unit respectively has a residual frequency departure, and the radio frequency unit in numeric field adjustment with residual frequency departure comprises to eliminate the step of this residual frequency departure: the radio frequency unit beyond numeric field is adjusted this first radio frequency unit is to eliminate each residual frequency departure.
13. methods as claimed in claim 11, it is characterized in that, based on the plurality of frequency deviation at least one of them determines that the step of an adjustment frequency deviation comprises: the first frequency deviation based in the plurality of frequency deviation and the second frequency deviation determine this adjustment frequency deviation, and this adjustment frequency deviation at least can partly be calibrated respectively this first frequency deviation and this second frequency deviation;
Wherein, after this calibration, each radio frequency unit has respectively a residual frequency departure, and the radio frequency unit in numeric field adjustment with residual frequency departure comprises to eliminate the step of this residual frequency departure: at numeric field, adjust each radio frequency unit to eliminate each residual frequency departure respectively.
14. methods as claimed in claim 13, is characterized in that, this adjustment frequency deviation is α * f0+ (1-α) * f1, and wherein f0 is this first frequency deviation, and f1 is this second frequency deviation, and α is the coefficient between (0,1).
15. methods as claimed in claim 14, is characterized in that, this first frequency deviation and this second frequency deviation are any two in the plurality of frequency deviation.
16. methods as claimed in claim 14, is characterized in that, this first frequency deviation and this second frequency deviation are respectively maximum frequency deviation and the minimum frequency deviations in the plurality of frequency deviation.
17. methods as described in claim 11-16 any one, is characterized in that, this mobile terminal is treated or bilateral mobile terminal for two.
18. methods as described in claim 11-16 any one, is characterized in that, this mobile terminal is three to treat or threeway mobile terminal.
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| TWI722942B (en) * | 2020-05-20 | 2021-03-21 | 大陸商北京升哲科技有限公司 | Spread spectrum signal sending method, spread spectrum signal receiving method, device, equipment and medium |
| CN115833987A (en) * | 2023-01-09 | 2023-03-21 | 北京智芯微电子科技有限公司 | Initial frequency offset calibration method and system for multi-frequency-band multi-network coexistence scene |
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| CN103686981B (en) | 2017-07-25 |
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