CN103856233B - Mobile terminal and signal processing method, baseband chip, radio frequency chip - Google Patents
Mobile terminal and signal processing method, baseband chip, radio frequency chip Download PDFInfo
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- CN103856233B CN103856233B CN201210521020.4A CN201210521020A CN103856233B CN 103856233 B CN103856233 B CN 103856233B CN 201210521020 A CN201210521020 A CN 201210521020A CN 103856233 B CN103856233 B CN 103856233B
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Abstract
The invention discloses a kind of mobile terminal and signal processing method, baseband chip, radio frequency chip, wherein said mobile terminal comprises baseband chip and radio frequency chip.In radio frequency chip, the radio-frequency module of all communication patterns shares the oscillator signal of a crystal oscillator generation.In baseband chip, by the sampling module corresponding with each radio-frequency module, sampling is carried out to the output signal obtained and obtain sampled signal, and according to the frequency shift (FS) between this output signal and corresponding base station signal, phase compensation is carried out to obtain signal of communication to respective sampled signal by compensating module, thus realize the Frequency Synchronization of each signal of communication and corresponding base station signal.The technical program decreases cost and the power consumption of radio frequency chip and baseband chip in multi-module mobile terminal, also eliminates complicated clock handoff procedure.
Description
Technical field
The present invention relates to mobile communication technology field, particularly mobile terminal and signal processing method, baseband chip, radio frequency chip.
Background technology
Radio frequency chip and baseband chip are the important component parts of mobile terminal, and mobile terminal, by radio frequency chip transceiving data and signal, is processed data that receive or to be sent and signal by baseband chip.As shown in Figure 1 be the existing injection frequently radio frequency chip of mobile terminal and the structural representation of baseband chip.With reference to figure 1, described radio frequency chip 11 comprises: crystal oscillator 111, frequency synthesizer 112, frequency mixer 113, low pass filter 114 and antenna 115.Described baseband chip 12 comprises: communication module 121 and utility module 122.Wherein, described communication module 121 comprises the first phase-locked loop 1211 and clock distribution topology 1212; Described utility module 122 comprises the second phase-locked loop 1221 and clock distribution topology 1222.In baseband chip 12, described utility module 122 is circuit modules irrelevant with the communication pattern of mobile terminal.
The operation principle of described radio frequency chip 11 and described baseband chip 12 is as follows: the communication module 121 in described baseband chip 12 or utility module 122 need reference clock, described crystal oscillator 111 enters operating state to produce oscillator signal, and described baseband chip 12 can using described oscillator signal as reference clock.Particularly, in described baseband chip 12, the first phase-locked loop 1211 of described communication module 121 and the second phase-locked loop 1221 of described utility module 122 are respectively using described oscillator signal as respective reference clock.Further, the reference clock obtaining different frequency with described reference clock for benchmark by respective clock distribution topology (i.e. clock distribution topology 1212 in communication module 121 and the clock distribution topology 1222 in utility module 122) uses for other modules in baseband chip 12.
When mobile terminal communicates with base station, due to may frequency shift (FS) be there is between mobile terminal and base station, therefore need the frequency of finely tuning the oscillator signal that described crystal oscillator 111 produces to make mobile terminal synchronous with base station holding frequency.Detailed process is as follows: continue with reference to figure 1, oscillator signal is produced by described crystal oscillator 111, frequency synthesis is carried out to produce local carrier via frequency synthesizer 112 pairs of oscillator signals, by frequency mixer 113, the base station signal received and local carrier are carried out mixing to obtain mixed frequency signal, carry out filtering to remove out of band signal by low pass filter 114 pairs of mixed frequency signals again, thus obtain i/q signal (i.e. inphase quadrature signal).Then, by described baseband chip 12, the frequency shift (FS) that a series of computing obtains needing adjustment is carried out to described i/q signal, and this frequency shift (FS) is converted to automatic frequency control (AutomaticFrequencyControl, AFC) voltage.Finally, finely tuned by the frequency of described AFC voltage to the oscillator signal that described crystal oscillator 111 produces, thus correction of frequency skew.
For the mobile terminal that how logical multimode is, because needs support that multiple communication pattern communicates simultaneously, so baseband chip needs to keep synchronous with the communication quality ensureing respective communication pattern with the base station frequency of multiple communication pattern simultaneously.Existing method is in radio frequency chip, use multiple crystal oscillator, each communication pattern is used alone a crystal oscillator, baseband chip carries out computing to obtain corresponding automatic control electric pressure to the i/q signal that radio frequency chip under different communication modes exports respectively, then finely tunes corresponding crystal oscillator respectively to correct respective frequency shift (FS) by each automatic control electric pressure.
As shown in Figure 2 be the radio frequency chip of the how logical mobile terminal of existing multimode and the structural representation of baseband chip.With reference to figure 2, radio frequency chip 21 comprises multiple radio-frequency module, as radio-frequency module 211, radio-frequency module 212 ..., radio-frequency module 21n, the structure in each radio-frequency module is identical with the radio frequency chip 11 in Fig. 1, is not described in detail at this.Baseband chip 22 comprises multiple communication module, as communication module 221, communication module 222 ..., communication module 22n, the structure in each communication module is identical with the communication module 121 in the baseband chip 12 in Fig. 1, is not described in detail at this.The oscillator signal that each communication module produces using the crystal oscillator in the radio-frequency module of correspondence is respectively as with reference to clock, and the oscillator signal produced as the crystal oscillator in radio-frequency module 211 is as the reference clock (reference clock 1 as shown in Figure 2) of communication module 221.
When mobile terminal needs to support that multiple communication pattern communicates simultaneously simultaneously, the radio-frequency module that each communication pattern is corresponding produces oscillator signal respectively, each radio-frequency module exports corresponding i/q signal (i/q signal 1 as shown in Figure 2 respectively, i/q signal 2, i/q signal n) to baseband chip 22, in baseband chip 22, corresponding communication module carries out computing to obtain the frequency shift (FS) between baseband chip 22 and the base station of each communication pattern to each i/q signal respectively, and this each frequency shift (FS) is converted to each AFC voltage (AFC voltage 1 as shown in Figure 2, AFC voltage 2, AFC voltage n) finely tune crystal oscillator in corresponding radio-frequency module respectively to correct respective frequency shift (FS).In practice, in radio frequency chip, arrange multiple crystal oscillator need not only cost is very high but also multiple crystal oscillator works simultaneously to consume much electricity.
On the other hand, continue with reference to figure 2, in baseband chip 22, also comprise utility module 222, the structure of this utility module 222 is identical with the utility module 122 in the baseband chip 12 in Fig. 1, is not described in detail at this.Because utility module 222 is suitable for the irrelevant circuit module of each communication pattern, therefore the reference clock of this utility module 222 can be selected from the reference clock of any one communication pattern, the reference clock of each communication pattern can be received as shown in Figure 2 by arranging a multiplexer 223, and therefrom select a reference clock as this utility module 222.Such design architecture will produce a problem: suppose current radio frequency module 211 and radio-frequency module 212 in running order, the oscillator signal (i.e. reference clock 1) that the reference clock of utility module 222 produces from the crystal oscillator of radio-frequency module 211.If user needs to close radio-frequency module 211, the reference clock 1 that then radio-frequency module 211 produces also will be closed, and the oscillator signal (i.e. reference clock 2) that the crystal oscillator that the reference clock of utility module 222 can not be switched to radio-frequency module 212 immediately produces, only have when waiting for utility module 222 penetration depth sleep state and then wake up and could select reference clock 2, thus making under the how logical state of multimode, the clock of baseband chip switches very complicated.
The U.S. Patent application file that more technical schemes synchronous with base station frequency about mobile terminal can be US6922406B2 with reference to publication number, denomination of invention is " method of MethodofSynchronizingBaseStations(synchronising base station) ".
Summary of the invention
The problem that the present invention solves reduces cost and the power consumption of radio frequency chip and baseband chip in multi-module mobile terminal, also eliminates complicated clock handoff procedure.
For solving the problem, embodiments provide a kind of mobile terminal, comprise baseband chip and radio frequency chip, described radio frequency chip comprises the first radio-frequency module and at least one second radio-frequency module, wherein each radio-frequency module includes signal processing module, described first radio-frequency module also comprises the crystal oscillator for generation of oscillator signal, and all described second radio-frequency modules share described crystal oscillator; Described signal processing module is used for processing to obtain output signal to described oscillator signal and the base station signal received;
Described baseband chip comprises multiple sampling module corresponding with each radio-frequency module respectively and compensating module; Wherein, described sampling module is used for sampling to obtain sampled signal to the described output signal carrying out self-corresponding radio-frequency module according to the sampling period of presetting; Described compensating module comprises automatic frequency control module and phase compensator; Wherein, described automatic frequency control module carrys out the frequency shift (FS) between the described output signal of self-corresponding radio-frequency module and described base station signal for determining; Described phase compensator is used for utilizing described frequency shift (FS) to carry out phase compensation to obtain signal of communication to described sampled signal.
Alternatively, described phase compensator is used for realizing following formula:
Alternatively, described signal processing module comprises antenna, frequency synthesizer, frequency mixer and low pass filter; Wherein, described antenna is for receiving base station signal; Described frequency synthesizer is used for carrying out frequency synthesis to produce local carrier to described oscillator signal; Described frequency mixer is used for the described base station signal received and described local carrier to carry out mixing to generate mixed frequency signal; Described low pass filter is for removing out of band signal in described mixed frequency signal to obtain described output signal.
Alternatively, described baseband chip also comprises communication module corresponding with each radio-frequency module respectively and phase-locked loop circuit; Described phase-locked loop circuit receives described oscillator signal, exports the reference clock of described communication module, and described communication module is for the treatment of the signal of communication carrying out self-corresponding compensating module.
Alternatively, described baseband chip also comprises utility module; Described oscillator signal is as the reference clock of described utility module.
Alternatively, described baseband chip also comprises control module, and described control module is for controlling starting of oscillation and the closedown of described crystal oscillator.
Alternatively, the communication pattern that each radio-frequency module is corresponding different respectively, the described default sampling period sets based on the communication pattern that radio-frequency module is corresponding.
Based on above-mentioned mobile terminal, the embodiment of the present invention additionally provides a kind of signal processing method of mobile terminal, comprising: receive the base station signal under at least one communication pattern; Process to obtain corresponding output signal to each described base station signal and the oscillator signal that crystal oscillator produces; Determine the frequency shift (FS) between each described output signal and described base station signal; Sample to obtain corresponding sampled signal to each described output signal according to the sampling period of presetting; Described frequency shift (FS) is utilized to carry out phase compensation to obtain corresponding signal of communication to each described sampled signal.
Alternatively, describedly utilize described frequency shift (FS) to carry out phase compensation to each described sampled signal to adopt following formula to realize to obtain corresponding signal of communication:
Alternatively, the oscillator signal produced described base station signal and crystal oscillator processes to obtain output signal and comprises: carry out frequency synthesis to produce local carrier to described oscillator signal; The described base station signal received and described local carrier are carried out mixing to generate mixed frequency signal; Remove out of band signal in described mixed frequency signal to obtain described output signal.
Alternatively, by phase-locked loop circuit, described oscillator signal is converted to the reference clock of communication module, described communication module is for the treatment of the described signal of communication obtained under corresponding communication pattern.
Alternatively, the described default sampling period sets based on different communication patterns.
Based on above-mentioned mobile terminal, the embodiment of the present invention additionally provides a kind of radio frequency chip, comprise the first radio-frequency module and at least one second radio-frequency module, wherein each radio-frequency module includes signal processing module, described first radio-frequency module also comprises the crystal oscillator for generation of oscillator signal, and all described second radio-frequency modules share described crystal oscillator; Described signal processing module is used for processing to obtain output signal to described oscillator signal and the base station signal received.
Based on above-mentioned mobile terminal, the embodiment of the present invention additionally provides a kind of baseband chip, comprises multiple sampling module corresponding with each radio-frequency module in above-mentioned radio frequency chip respectively and compensating module; Wherein, described sampling module is used for sampling to obtain sampled signal to the described output signal carrying out self-corresponding radio-frequency module according to the sampling period of presetting; Described compensating module comprises automatic frequency control module and phase compensator; Wherein, described automatic frequency control module carrys out the frequency shift (FS) between the described output signal of self-corresponding radio-frequency module and described base station signal for determining; Described phase compensator is used for utilizing described frequency shift (FS) to carry out phase compensation to obtain signal of communication to described sampled signal.
Compared with prior art, technical solution of the present invention has following beneficial effect:
No matter mobile terminal supports how many kinds of communication pattern, and in radio frequency chip, the radio-frequency module of all communication patterns shares the oscillator signal of a crystal oscillator generation.In baseband chip, by the sampling module corresponding with each radio-frequency module, sampling is carried out to the output signal obtained and obtain sampled signal, and have compensating module to carry out phase compensation to obtain signal of communication according to the frequency shift (FS) between this output signal and corresponding base station signal to respective sampled signal, thus realize the Frequency Synchronization of each signal of communication and corresponding base station signal.Owing to only using a crystal oscillator in radio frequency chip, because this reducing chip cost, saving chip power-consumption.
Further, owing to only having a crystal oscillator in radio frequency chip, utility module in baseband chip and each communication module are all the oscillator signals that produce using this crystal oscillator as with reference to clock, therefore also eliminate utility module in prior art may need to carry out complicated clock handoff procedure, improve the efficiency of mobile terminal processing signals.
Accompanying drawing explanation
Fig. 1 is the existing injection radio frequency chip of mobile terminal and the structural representation of baseband chip frequently;
Fig. 2 is the radio frequency chip of the how logical mobile terminal of existing multimode and the structural representation of baseband chip;
Fig. 3 is the radio frequency chip of the how logical mobile terminal of a kind of multimode of the present invention and the structural representation of baseband chip;
Fig. 4 is the schematic flow sheet of the execution mode of the signal processing method of a kind of mobile terminal of the present invention.
Embodiment
For the problem of prior art, inventor is through research, provide a kind of mobile terminal and signal processing method, baseband chip and radio frequency chip, both reduced cost and the power consumption of radio frequency chip and baseband chip in multi-module mobile terminal, eliminate again complicated clock handoff procedure.
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Set forth detail in the following description so that fully understand the present invention.But the present invention can be different from alternate manner described here to implement with multiple, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention.Therefore the present invention is not by the restriction of following public embodiment.
As shown in Figure 3 be the radio frequency chip of the how logical mobile terminal of a kind of multimode of the present invention and the structural representation of baseband chip.With reference to figure 3, first, the internal structure of radio frequency chip 31 and baseband chip 32 is described in detail respectively.
Described radio frequency chip 31 comprises multiple radio-frequency module, radio-frequency module 311 as shown in Figure 3, radio-frequency module 312 ..., radio-frequency module 31n, wherein n is more than or equal to 2.Wherein, the number of communication pattern that the concrete number of radio-frequency module can be supported according to mobile terminal is determined.
Unlike the prior art, in the present embodiment, described radio frequency chip 31 comprises two kinds of radio-frequency modules, and a kind of radio-frequency module comprises crystal oscillator and signal processing module; Another kind of radio-frequency module comprises signal processing module, but does not comprise crystal oscillator.Specifically, continue with reference to figure 3, in radio frequency chip 31, described radio-frequency module 311 comprises crystal oscillator 3111 and signal processing module, and all the other n-1 radio-frequency module comprises signal processing module, but does not comprise crystal oscillator.In the present embodiment, described signal processing module comprises antenna, frequency synthesizer, frequency mixer and low pass filter.Such as, described radio-frequency module 311 comprises frequency synthesizer 3112, frequency mixer 3113, low pass filter 3114 and antenna 3115; Described radio-frequency module 312 comprises frequency synthesizer 3122, frequency mixer 3123, low pass filter 3124 and antenna 3125; Described radio-frequency module 31n comprises frequency synthesizer 31n2, frequency mixer 31n3, low pass filter 31n4 and antenna 31n5.
Described baseband chip 32 comprises multiple sampling module corresponding with each radio-frequency module respectively and compensating module.Specifically, continue with reference to figure 3, described baseband chip 32 comprise the sampling module 3211 corresponding with described radio-frequency module 311 and compensating module 321, the sampling module 3221 corresponding with described radio-frequency module 312 and compensating module 322 ..., the sampling module 32n1 corresponding with described radio-frequency module 31n and compensating module 32n.Wherein, each sampling module is used for sampling to obtain sampled signal to the described output signal carrying out self-corresponding radio-frequency module according to the sampling period of presetting.Each compensating module carries out phase compensation to obtain signal of communication to the output signal of each self-corresponding radio-frequency module via the sampled signal obtained after sampling module sampling respectively.
Each compensating module comprises phase compensator and automatic frequency control module.Such as, described compensating module 321 comprises phase compensator 3212 and automatic frequency control module 3213; Described compensating module 322 comprises phase compensator 3222 and automatic frequency control module 3223; Described compensating module 32n comprises phase compensator 32n2 and automatic frequency control module 32n3.
Described baseband chip 32 also comprises communication module corresponding with each radio-frequency module respectively and phase-locked loop circuit.Specifically, continue with reference to figure 3, described baseband chip 32 comprise the communication module 3214 corresponding with described radio-frequency module 311 and phase-locked loop circuit 3215, the communication module 3224 corresponding with described radio-frequency module 312 and phase-locked loop circuit 3225 ..., the communication module 32n4 corresponding with described radio-frequency module 31n and phase-locked loop circuit 32n5.Wherein, the oscillator signal that each phase-locked loop circuit produces using described crystal oscillator 3111 is as the reference clock of the communication module of correspondence, and each communication module is for the treatment of the signal of communication carrying out self-corresponding compensating module.
Described baseband chip 32 also comprises utility module 323, and described utility module 323 is circuit modules irrelevant with various communication pattern, such as independently application processor in intelligent mobile terminal.Unlike the prior art, in the present embodiment, owing to only having a crystal oscillator 3111 in radio frequency chip 31, therefore described utility module 323 is usually just using the oscillator signal of this crystal oscillator 3111 generation as reference clock.Described baseband chip 32 also comprises control module 324, and described control module 324 is for controlling starting of oscillation and the closedown of described crystal oscillator 3111.In actual applications, when the arbitrary communication module in described baseband chip 32 or described utility module 323 need reference clock, described control module 324 controls the starting of oscillation of described crystal oscillator 3111 to produce the reference clock of oscillator signal as communication module or utility module.And when needing reference clock without any circuit module in described baseband chip 32, described control module 324 controls described crystal oscillator 3111 and closes.
Below according to radio frequency chip as shown in Figure 3 and the structural representation of baseband chip, to mobile terminal communicate with base station under plurality of communication schemes simultaneously (namely multimode leads to) time, the operation principle of described radio frequency chip 31 and baseband chip 32 is described in detail.It should be noted that, the present embodiment processes in downstream signal process under plurality of communication schemes based on described mobile terminal, keeps described downstream signal and the Frequency Synchronization separately between base station signal to be that example is described.
Described control module 324 controls the starting of oscillation of described crystal oscillator 3111 to produce oscillator signal.Owing to only having a crystal oscillator 3111 in described radio frequency chip 31, therefore when how logical multimode is, each radio-frequency module shares this crystal oscillator 3111, that is, the oscillator signal that the signal processing module in each radio-frequency module all produces with this crystal oscillator 3111 carries out processing to obtain respective output signal with the base station signal received separately.
In the present embodiment, signal processing module in each radio-frequency module carries out frequency synthesis to produce local carrier by frequency synthesizer to described oscillator signal, usual described local carrier comprises sine wave signal and cosine wave signal, and two signal phases differ 90 degree.The base station signal of corresponding communication pattern is received by antenna.Then, by frequency mixer, the base station signal received and described local carrier are carried out mixing to generate mixed frequency signal, carry out mixing respectively to sine wave signal and cosine wave signal by described base station signal and generate two corresponding mixed frequency signals.Then, remove out of band signal in described mixed frequency signal to obtain described output signal by low pass filter, wherein said out of band signal refers to that the band of described low pass filter leads to the part signal outside scope.Owing to both having comprised the mixed frequency signal of sine wave signal and base station signal in described mixed frequency signal, also comprise the mixed frequency signal of cosine wave signal and base station signal, therefore described output signal is inphase quadrature signal (i.e. i/q signal).It should be noted that, above-described antenna, frequency synthesizer, frequency mixer and low pass filter is not limited in described signal processing module, corresponding processing module can also be increased in actual applications according to the needs of signal transacting, this does not affect essence of the present invention, is not described in detail at this.
Because the base station frequency of each communication pattern is not identical as a rule, therefore each radio-frequency module obtain output signal and each communication pattern under base station signal between can there is frequency shift (FS).Be different from prior art, each radio-frequency module is not a private crystal oscillator, therefore cannot correct frequency shift (FS) between the output signal of each radio-frequency module and base station signal by finely tuning this crystal oscillator.Therefore, inventor considers, in baseband chip, carries out phase compensation to realize the Frequency Synchronization between corresponding base station signal by the output signal obtained each radio-frequency module.
In the present embodiment, the output signal that each radio-frequency module exports first carries out sampling processing to obtain sampled signal respectively by sampling module corresponding in described baseband chip 32, then carries out phase compensation by corresponding compensating module to sampled signal.Such as, continue with reference to figure 3, the output signal 1 that described radio-frequency module 311 exports carries out sampling processing to obtain sampled signal by described sampling module 3211, then carries out phase compensation via described compensating module 321 to described sampled signal; The output signal 2 that described radio-frequency module 312 exports carries out sampling processing to obtain sampled signal by described sampling module 3221, then carries out phase compensation via described compensating module 322 to described sampled signal; The output signal n that described radio-frequency module 31n exports carries out sampling processing to obtain sampled signal by described sampling module 32n1, then carries out phase compensation via described compensating module 32n.
Specifically, the output signal that each radio-frequency module exports is analog signal, the sampling module (be here modulus sampling module) corresponding with each radio-frequency module sampled to obtain sampled signal to output signal according to the sampling period of presetting, and described sampled signal is digital signal.Wherein, the different communication modes corresponding according to each radio-frequency module of described default sampling period sets, and in the present embodiment, does not limit the concrete periodic quantity in described default sampling period.
Each described compensating module is determined to carry out the frequency shift (FS) between the described output signal of self-corresponding radio-frequency module and described base station signal by automatic frequency control module.Those skilled in the art understand, in each radio-frequency module, described frequency mixer be in fact two different frequencies (i.e. the base station signal of the communication pattern that this radio-frequency module is corresponding and local carrier) are transformed into one with the mixed frequency signal of both relevant new frequency of oscillation, this new frequency of oscillation is the difference of above-mentioned two different frequencies, and the difference of this different frequency is exactly the frequency shift (FS) between output signal and base station signal.But this frequency shift (FS) cannot be determined in each radio-frequency module, need to be determined by the automatic frequency control module in the compensating module corresponding with each radio-frequency module.In actual applications, described automatic frequency control module can draw this frequency shift (FS) by internal arithmetic.
Phase compensator in each described compensating module then carries out phase compensation to obtain signal of communication according to frequency shift (FS) to described sampled signal.
For example, if the sampled signal without frequency deviation is R (n), between local carrier (oscillator signal produced by crystal oscillator obtains after frequency synthesis) and base station signal, difference on the frequency is Δ f(and described frequency shift (FS)), sample count values is n, and the default sampling period is t
s, the initial phase deviation between the oscillator signal that crystal oscillator produces and base station signal is Φ
init, the sampled signal of output signal after over-sampling that any one radio-frequency module exports is that R ' (n) can be expressed as:
Wherein, the described sampled signal without frequency deviation is that R (n) is equivalent to the base station signal of each communication pattern according to the sampling period t preset separately
ssampled signal after sampling.The frequency shift (FS) that between described local carrier and base station signal, difference on the frequency is equivalent between the described output signal of the next self-corresponding radio-frequency module determined needed for described automatic frequency control module and described base station signal for Δ f.
Further, the described phase compensator in each compensating module can compensate φ=2 π × Δ f × n × t to the sampled signal R ' (n) after sampling module sampling processing
sphase deviation, the signal of communication R that each the sampled signal R ' (n) namely after sampling module sampling processing obtains after carrying out phase compensation by respective phase compensator " (n) is:
Can find out, " (n) is that R (n) only exists fixing phase difference Φ with the sampled signal without frequency deviation to the signal of communication R that each compensating module exports
init, thus " the Frequency Synchronization between the base station signal under (n) and separately communication pattern that achieves each signal of communication R.
On the other hand, in described baseband chip 32, described utility module 323 and each communication module (communication module 3214 as shown in Figure 3, communication module 3224 ..., communication module 32n4) oscillator signal that all produces using described crystal oscillator 3111 is as with reference to clock, therefore compared with prior art, complicated clock handoff procedure is eliminated.
It should be noted that, the structural representation of the radio frequency chip that the present embodiment provides and baseband chip is mainly used in the how logical mobile terminal of multimode.For single mode single-pass (namely injection frequently) mobile terminal, the radio frequency chip that the present embodiment also can be adopted to provide and the structure of baseband chip, namely the output signal exported by radio frequency chip is first carried out sampling and is obtained sampled signal, then realizes and the Frequency Synchronization of base station signal through phase compensation sampled signal.But because in single radio frequency chip, itself only needs a crystal oscillator, therefore preferred mode still carrys out the frequency of synchronising base station signal by the frequency of directly finely tuning this crystal oscillator, namely in injection frequently mobile terminal, adopts the structural representation of radio frequency chip as shown in Figure 1 and baseband chip to be good.
Based on the radio frequency chip of the how logical mobile terminal of the above-mentioned multimode provided and the structure of baseband chip, the embodiment of the present invention additionally provides a kind of signal processing method of mobile terminal.The schematic flow sheet of the execution mode of the signal processing method of of the present invention a kind of mobile terminal as shown in Figure 4.With reference to figure 4, described signal processing method comprises:
Step S1: receive the base station signal under at least one communication pattern;
Step S2: process to obtain corresponding output signal to each described base station signal and the oscillator signal that crystal oscillator produces;
Step S3: determine the frequency shift (FS) between each described output signal and described base station signal;
Step S4: sample to obtain corresponding sampled signal to each described output signal according to the sampling period of presetting;
Step S5: utilize described frequency shift (FS) to carry out phase compensation to obtain corresponding signal of communication to each described sampled signal.
In a particular embodiment, described step S2 specifically comprises: carry out frequency synthesis to produce local carrier to described oscillator signal; The described base station signal received and described local carrier are carried out mixing to generate mixed frequency signal; Remove out of band signal in described mixed frequency signal to obtain described output signal.The sampling period of presetting in described step S4 sets based on different communication patterns.
Present embodiment realizes based on the radio frequency chip of the how logical mobile terminal of multimode as shown in Figure 3 and the structure of baseband chip.In conjunction with reference to figure 3, in baseband chip 32, obtained by the communication module process corresponding with communication pattern each described in signal of communication, the reference clock of each communication module obtains after being changed the oscillator signal that described crystal oscillator produces by each phase-locked loop circuit of correspondence.
The embodiment that in present embodiment, the concrete implementation of each step can be described in reference diagram 3, does not repeat them here.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection range of technical solution of the present invention.
Claims (12)
1. a mobile terminal, comprises baseband chip and radio frequency chip, it is characterized in that,
Described radio frequency chip comprises the first radio-frequency module and at least one second radio-frequency module, wherein each radio-frequency module includes signal processing module, described first radio-frequency module also comprises the crystal oscillator for generation of oscillator signal, and all described second radio-frequency modules share described crystal oscillator; Described signal processing module is used for processing to obtain output signal to described oscillator signal and the base station signal received;
Described baseband chip comprises multiple sampling module corresponding with each radio-frequency module respectively and compensating module; Wherein, described sampling module is used for sampling to obtain sampled signal to the described output signal carrying out self-corresponding radio-frequency module according to the sampling period of presetting; Described compensating module comprises automatic frequency control module and phase compensator; Wherein, described automatic frequency control module carrys out the frequency shift (FS) between the described output signal of self-corresponding radio-frequency module and described base station signal for determining; Described phase compensator is used for utilizing described frequency shift (FS) to carry out phase compensation to obtain signal of communication to described sampled signal, each signal of communication obtained after phase compensation and the Frequency Synchronization of corresponding base station signal.
2. mobile terminal according to claim 1, is characterized in that, described phase compensator is used for realizing following formula:
Wherein, R ' (n) represents the sampled signal obtained after sampling according to the described output signal of the sampling period of presetting to next self-corresponding radio-frequency module; " (n) represents the signal of communication obtained after each sampled signal R ' (n) carries out phase compensation by respective phase compensator to R; Δ f represents described frequency shift (FS); N represents sample count values; t
srepresent the sampling period of presetting.
3. mobile terminal according to claim 1, is characterized in that, described signal processing module comprises antenna, frequency synthesizer, frequency mixer and low pass filter; Wherein,
Described antenna is for receiving base station signal; Described frequency synthesizer is used for carrying out frequency synthesis to produce local carrier to described oscillator signal; Described frequency mixer is used for the described base station signal received and described local carrier to carry out mixing to generate mixed frequency signal; Described low pass filter is for removing out of band signal in described mixed frequency signal to obtain described output signal.
4. mobile terminal according to claim 1, is characterized in that, described baseband chip also comprises communication module corresponding with each radio-frequency module respectively and phase-locked loop circuit; The reference clock of described phase-locked loop circuit using described oscillator signal as described communication module, described communication module is for the treatment of the signal of communication carrying out self-corresponding compensating module.
5. mobile terminal according to claim 1, is characterized in that, described baseband chip also comprises utility module; Described oscillator signal is as the reference clock of described utility module.
6. mobile terminal according to claim 1, is characterized in that, described baseband chip also comprises control module, and described control module is for controlling starting of oscillation and the closedown of described crystal oscillator.
7. mobile terminal according to claim 1, is characterized in that, the communication pattern that each radio-frequency module is corresponding different respectively, and the described default sampling period sets based on the communication pattern that radio-frequency module is corresponding.
8. a signal processing method for mobile terminal, is characterized in that, comprising:
Receive the base station signal under at least one communication pattern;
Process to obtain corresponding output signal to each described base station signal and the oscillator signal that crystal oscillator produces;
Determine the frequency shift (FS) between each described output signal and described base station signal;
Sample to obtain corresponding sampled signal to each described output signal according to the sampling period of presetting;
Described frequency shift (FS) is utilized to carry out phase compensation to obtain corresponding signal of communication, each signal of communication obtained after phase compensation and the Frequency Synchronization of corresponding base station signal to each described sampled signal.
9. the signal processing method of mobile terminal according to claim 8, is characterized in that, describedly utilizes described frequency shift (FS) to carry out phase compensation to each described sampled signal to adopt following formula to realize to obtain corresponding signal of communication:
Wherein, R ' (n) represents the sampled signal obtained after sampling according to the described output signal of the sampling period of presetting to next self-corresponding radio-frequency module; " (n) represents the signal of communication obtained after each sampled signal R ' (n) carries out phase compensation by respective phase compensator to R; Δ f represents described frequency shift (FS); N represents sample count values; t
srepresent the sampling period of presetting.
10. the signal processing method of mobile terminal according to claim 8, is characterized in that, the oscillator signal produced described base station signal and crystal oscillator processes to obtain output signal and comprises:
Frequency synthesis is carried out to produce local carrier to described oscillator signal;
The described base station signal received and described local carrier are carried out mixing to generate mixed frequency signal;
Remove out of band signal in described mixed frequency signal to obtain described output signal.
The signal processing method of 11. mobile terminals according to claim 8, it is characterized in that, by phase-locked loop circuit, described oscillator signal is converted to the reference clock of communication module, described communication module is for the treatment of the described signal of communication obtained under corresponding communication pattern.
The signal processing method of 12. mobile terminals according to claim 8, is characterized in that, the described default sampling period sets based on different communication patterns.
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| CN108362941B (en) * | 2018-03-29 | 2023-07-18 | 珠海迈科智能科技股份有限公司 | Equipment and method for testing frequency deviation of Tuner module crystal oscillator |
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| EP2055003A2 (en) * | 2006-08-09 | 2009-05-06 | QUALCOMM Incorporated | Reference signal generation for multiple communication systems |
| 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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| CN101369882A (en) * | 2007-08-17 | 2009-02-18 | 电子科技大学 | Frequency synchronization method based on pre-correction of sending terminal |
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