CN103856233A - Mobile terminal and signal processing method, baseband chip and radio frequency chip of the mobile terminal - Google Patents
Mobile terminal and signal processing method, baseband chip and radio frequency chip of the mobile terminal Download PDFInfo
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- CN103856233A CN103856233A CN201210521020.4A CN201210521020A CN103856233A CN 103856233 A CN103856233 A CN 103856233A CN 201210521020 A CN201210521020 A CN 201210521020A CN 103856233 A CN103856233 A CN 103856233A
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Abstract
The invention discloses a mobile terminal and a signal processing method, a baseband chip and a radio frequency chip of the mobile terminal. The mobile terminal comprises the baseband chip and the radio frequency chip. In the radio frequency chip, radio frequency modules of all communication modes share oscillator signals generated by a crystal oscillator. In the baseband chip, sampling modules corresponding to the radio frequency modules are used for sampling obtained output signals, so that sampling signals are obtained, and according to the frequency shift between the output signals and corresponding base station signals, compensation modules are used for conducting phase compensation on respective sampling signals to obtain communication signals, so that frequency synchronism of all the communication signals and corresponding base station signals is realized. The mobile terminal and the signal processing method, the baseband chip and the radio frequency chip of the mobile terminal reduce the cost and the power consumption of the radio frequency chip in the multi-mode mobile terminal and the cost and the power consumption of the baseband chip in the multi-mode mobile terminal, and eliminate the complex clock switching process.
Description
Technical field
The present invention relates to mobile communication technology field, particularly mobile terminal and signal processing method thereof, 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 radio frequency chip of mobile terminal and the structural representation of baseband chip frequently.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: communication module 121 or utility module 122 in described baseband chip 12 need reference clock, described crystal oscillator 111 enters operating state to produce oscillator signal, and described baseband chip 12 can be using described oscillator signal as with reference to 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 reference clock separately.Further, the reference clock that obtains different frequency take described reference clock as benchmark by clock distribution topology (being the clock distribution topology 1222 in clock distribution topology 1212 and the utility module 122 in communication module 121) is separately for other modules uses in baseband chip 12.
In the time that mobile terminal and base station communicate, owing to may there is frequency shift (FS) between mobile terminal and base station, therefore need to finely tune the oscillator signal that described crystal oscillator 111 produces frequency so that mobile terminal synchronize with base station holding frequency.Detailed process is as follows: continue with reference to figure 1, produce oscillator signal by described crystal oscillator 111, via frequency synthesizer 112, oscillator signal is carried out to frequency synthesis to produce local carrier, by frequency mixer 113, the base station signal receiving and local carrier are carried out to mixing to obtain mixed frequency signal, by low pass filter 114, mixed frequency signal is carried out to filtering to remove out of band signal again, thereby obtain i/q signal (being inphase quadrature signal).Then, by described baseband chip 12, described i/q signal is carried out to a series of computings and obtain needing the frequency shift (FS) of adjustment, and this frequency shift (FS) is converted to automatic frequency control (Automatic Frequency Control, AFC) voltage.Finally, the frequency of the oscillator signal described crystal oscillator 111 being produced by described AFC voltage is finely tuned, thus correction of frequency skew.
For the how logical mobile terminal of multimode, because needs are supported multiple communication patterns and communicated by letter simultaneously, baseband chip needs to keep with the base station frequency of multiple communication patterns the communication quality that synchronize with assurance respective communication pattern simultaneously so.Existing method is in radio frequency chip, to use multiple crystal oscillators, each communication pattern uses separately a crystal oscillator, baseband chip carries out computing to the i/q signal of radio frequency chip output under different communication modes respectively presses to obtain corresponding automatic control electric, then is pressed and finely tuned respectively corresponding crystal oscillator to correct frequency shift (FS) separately by each automatic control electric.
As shown in Figure 2 be the how logical radio frequency chip of mobile terminal and the structural representation of baseband chip of existing multimode.With reference to figure 2, radio frequency chip 21 comprises multiple radio-frequency modules, 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 modules, as communication module 221, communication module 222 ..., communication module 22n, the structure in each communication module is identical with the communication module 121 in 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 corresponding radio-frequency module is respectively as with reference to clock, and the oscillator signal producing 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.
In the time that mobile terminal need to support that multiple communication patterns are communicated by letter simultaneously simultaneously, the radio-frequency module that each communication pattern is corresponding produces respectively oscillator signal, each radio-frequency module is exported respectively corresponding i/q signal (i/q signal 1 as shown in Figure 2, i/q signal 2, i/q signal is n) to baseband chip 22, in baseband chip 22, corresponding communication module is carried 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) is finely tuned respectively crystal oscillator in corresponding radio-frequency module to correct frequency shift (FS) separately.In practice, multiple crystal oscillators are set in radio frequency chip and the in the situation that not only cost being very high but also multiple crystal oscillators are worked, need to consume much electricity simultaneously.
On the other hand, continue with reference to figure 2, also comprise utility module 222 in baseband chip 22, the structure of this utility module 222 is identical with the utility module 122 in 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, can receive by a multiplexer 223 is set as shown in Figure 2 the reference clock of each communication pattern, and therefrom select a reference clock as this utility module 222.Such design architecture will produce a problem: suppose that current radio-frequency module 211 and radio-frequency module 212 are in running order, the oscillator signal (being reference clock 1) that the reference clock of utility module 222 produces from the crystal oscillator of radio-frequency module 211.If user need to close radio-frequency module 211, the reference clock 1 that radio-frequency module 211 produces also will be closed, and the reference clock of utility module 222 can not be switched to the oscillator signal (being reference clock 2) that the crystal oscillator of radio-frequency module 212 produces immediately, only have the utility module 222 penetration depth sleep states of wait and then could select reference clock 2 while waking up, thereby make under the how logical state of multimode, the clock of baseband chip switches very complicated.
More technical schemes of synchronizeing with base station frequency about mobile terminal can be US6922406B2, denomination of invention with reference to publication number is the U.S. Patent application file of " method of Method of Synchronizing Base Stations(synchronising base station) ".
Summary of the invention
The problem that the present invention solves is to reduce cost and the power consumption of the interior radio frequency chip of multi-module mobile terminal and baseband chip, has also exempted complicated clock handoff procedure.
For addressing the above problem, the embodiment of the present invention provides 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 the first radio-frequency module also comprises the crystal oscillator for generation of oscillator signal, and all described the second radio-frequency modules share described crystal oscillator; Described signal processing module is for processing to obtain output signal to described oscillator signal and the base station signal receiving;
Described baseband chip comprises multiple sampling module and compensating modules corresponding with each radio-frequency module respectively; Wherein, described sampling module is for sampling to obtain sampled signal according to the default sampling period to the described output signal of carrying out self-corresponding radio-frequency module; Described compensating module comprises automatic frequency control module and phase compensator; Wherein, described automatic frequency control module is for determining the frequency shift (FS) between described output signal and the described base station signal that carrys out self-corresponding radio-frequency module; 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 used for receiving base station signal; Described frequency synthesizer is for carrying out frequency synthesis to produce local carrier to described oscillator signal; Described frequency mixer is for carrying out mixing to generate mixed frequency signal by the described base station signal receiving and described local carrier; The out of band signal that described low pass filter is used for removing described mixed frequency signal is to obtain described output signal.
Alternatively, described baseband chip also comprises corresponding with each radio-frequency module respectively communication module 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 that carrys 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 the starting of oscillation of described crystal oscillator and closing.
Alternatively, each radio-frequency module is the different communication pattern of correspondence respectively, and the described default sampling period is set based on communication pattern corresponding to radio-frequency module.
Based on above-mentioned mobile terminal, the embodiment of the present invention also provides a kind of signal processing method of mobile terminal, comprising: receive the base station signal under at least one communication pattern; Each described base station signal is processed to obtain corresponding output signal with the oscillator signal that crystal oscillator produces; Determine the frequency shift (FS) between each described output signal and described base station signal; Each described output signal is sampled to obtain corresponding sampled signal according to the default sampling period; Utilize described frequency shift (FS) 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 of described base station signal and crystal oscillator generation being processed to obtain output signal comprises: described oscillator signal is carried out to frequency synthesis to produce local carrier; The described base station signal receiving and described local carrier are carried out to 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 obtaining under corresponding communication pattern.
Alternatively, the communication pattern based on different is set the described default sampling period.
Based on above-mentioned mobile terminal, the embodiment of the present invention also 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 the first radio-frequency module also comprises the crystal oscillator for generation of oscillator signal, and all described the second radio-frequency modules share described crystal oscillator; Described signal processing module is for processing to obtain output signal to described oscillator signal and the base station signal receiving.
Based on above-mentioned mobile terminal, the embodiment of the present invention also provides a kind of baseband chip, comprises multiple sampling module and compensating modules corresponding with each radio-frequency module in above-mentioned radio frequency chip respectively; Wherein, described sampling module is for sampling to obtain sampled signal according to the default sampling period to the described output signal of carrying out self-corresponding radio-frequency module; Described compensating module comprises automatic frequency control module and phase compensator; Wherein, described automatic frequency control module is for determining the frequency shift (FS) between described output signal and the described base station signal that carrys out self-corresponding radio-frequency module; 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 is supported how many kinds of communication pattern, and in radio frequency chip, the radio-frequency module of all communication patterns shares the oscillator signal that a crystal oscillator produces.In baseband chip, by the sampling module corresponding with each radio-frequency module, the output signal obtaining is sampled and obtained sampled signal, and have compensating module, according to the frequency shift (FS) between this output signal and corresponding base station signal, sampled signal is separately carried out to phase compensation to obtain signal of communication, thereby 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, therefore reduce chip cost, saved 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 having exempted utility module in prior art may need to carry out complicated clock handoff procedure, has improved 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 how logical radio frequency chip of mobile terminal of existing multimode and the structural representation of baseband chip;
Fig. 3 is the how logical radio frequency chip of 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, a kind of mobile terminal and signal processing method thereof, baseband chip and radio frequency chip are provided, have both reduced cost and the power consumption of the interior radio frequency chip of multi-module mobile terminal and baseband chip, exempted again complicated clock handoff procedure.
For above-mentioned purpose of the present invention, feature and advantage can more be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
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 and implements with multiple, and those skilled in the art can do similar popularization without prejudice to intension of the present invention in the situation that.Therefore the present invention is not subject to the restriction of following public embodiment.
As shown in Figure 3 be the how logical radio frequency chip of mobile terminal and the structural representation of baseband chip of a kind of multimode of the present invention.With reference to figure 3, first, respectively the internal structure of radio frequency chip 31 and baseband chip 32 is described in detail.
Described radio frequency chip 31 comprises multiple radio-frequency modules, as shown in Figure 3 radio-frequency module 311, radio-frequency module 312 ..., radio-frequency module 31n, wherein n is more than or equal to 2.The number of the communication pattern that wherein, 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.For example, 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 and compensating modules corresponding with each radio-frequency module respectively.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, with sampling module 3221 corresponding to described radio-frequency module 312 and compensating module 322 ..., sampling module 32n1 and the compensating module 32n corresponding with described radio-frequency module 31n.Wherein, each sampling module is for sampling to obtain sampled signal according to the default sampling period to the described output signal of carrying out self-corresponding radio-frequency module.The sampled signal that each compensating module obtains after respectively the output signal of each self-corresponding radio-frequency module being sampled via sampling module is carried out phase compensation to obtain signal of communication.
Each compensating module comprises phase compensator and automatic frequency control module.For example, 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 corresponding with each radio-frequency module respectively communication module 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, with communication module 3224 corresponding to described radio-frequency module 312 and phase-locked loop circuit 3225 ..., communication module 32n4 and the phase-locked loop circuit 32n5 corresponding with described radio-frequency module 31n.Wherein, the oscillator signal that each phase-locked loop circuit produces using described crystal oscillator 3111 is as the reference clock of corresponding communication module, and each communication module is for the treatment of the signal of communication that carrys 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 patterns, for example application processor independently 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, the oscillator signal that therefore described utility module 323 just produces using this crystal oscillator 3111 is conventionally as with reference to clock.Described baseband chip 32 also comprises control module 324, and described control module 324 is for controlling the starting of oscillation of described crystal oscillator 3111 and closing.In actual applications, in the time that the arbitrary communication module in described baseband chip 32 or described utility module 323 need reference clock, described control module 324 is controlled described crystal oscillator 3111 starting of oscillations to produce the reference clock of oscillator signal as communication module or utility module.And in the time needing reference clock without any circuit module in described baseband chip 32, described control module 324 is controlled described crystal oscillator 3111 and is closed.
According to radio frequency chip as shown in Figure 3 and the structural representation of baseband chip, mobile terminal is communicated to (being that how logical multimode is) under plurality of communication schemes simultaneously during with base station, the operation principle of described radio frequency chip 31 and baseband chip 32 is described in detail below.It should be noted that, the present embodiment is to process in downstream signal process under plurality of communication schemes based on described mobile terminal, keep described downstream signal and separately the Frequency Synchronization between base station signal be that example is described.
Described control module 324 is controlled described crystal oscillator 3111 starting of oscillations to produce oscillator signal.Owing to only having a crystal oscillator 3111 in described radio frequency chip 31, therefore in the situation that how logical multimode is, each radio-frequency module shares this crystal oscillator 3111, that is to say, the oscillator signal that the signal processing module in each radio-frequency module all produces with this crystal oscillator 3111 processes to obtain output signal separately with the base station signal receiving 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, common described local carrier comprises sine wave signal and cosine wave signal, and two signal phases differ 90 degree.By the base station signal of the corresponding communication pattern of antenna reception.Then, by frequency mixer, the base station signal receiving and described local carrier are carried out to mixing to generate mixed frequency signal, carry out mixing with sine wave signal and cosine wave signal respectively by described base station signal and generate corresponding two 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 the part signal outside the logical scope of the band of described low pass filter.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 (being i/q signal).It should be noted that, in described signal processing module, be not limited to above-described antenna, frequency synthesizer, frequency mixer and low pass filter, can also increase corresponding processing module according to the needs of signal processing in actual applications, 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, between the base station signal under output signal and each communication pattern that therefore each radio-frequency module obtains, can there is frequency shift (FS).Be different from prior art, each radio-frequency module is not a private crystal oscillator, therefore cannot correct by finely tuning this crystal oscillator the frequency shift (FS) between output signal and the base station signal of each radio-frequency module.Therefore, inventor considers, in baseband chip, by the output signal that each radio-frequency module is obtained carry out that phase compensation realizes and corresponding base station signal between Frequency Synchronization.
In the present embodiment, the output signal of each radio-frequency module output is first carried out sampling processing to obtain sampled signal by sampling module corresponding in described baseband chip 32 respectively, then by corresponding compensating module, sampled signal is carried out to phase compensation.For example, continue with reference to figure 3, the output signal 1 that described radio-frequency module 311 is exported is carried out sampling processing to obtain sampled signal by described sampling module 3211, then via described compensating module 321, described sampled signal is carried out to phase compensation; The output signal 2 that described radio-frequency module 312 is exported is carried out sampling processing to obtain sampled signal by described sampling module 3221, then via described compensating module 322, described sampled signal is carried out to phase compensation; The output signal n of described radio-frequency module 31n output 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 of each radio-frequency module output is analog signal, the sampling module (be here modulus sampling module) corresponding with each radio-frequency module samples to obtain sampled signal according to the default sampling period to output signal, and described sampled signal is digital signal.Wherein, the described default sampling period is set according to different communication modes corresponding to each radio-frequency module, in the present embodiment, does not limit the concrete periodic quantity in described default sampling period.
Each described compensating module is determined the frequency shift (FS) between described output signal and the described base station signal that carrys out self-corresponding radio-frequency module by automatic frequency control module.Those skilled in the art understand, in each radio-frequency module, described frequency mixer be in fact by two different frequencies (base station signal and local carrier of the communication pattern that this radio-frequency module is corresponding) be transformed into one with the mixed frequency signal of both relevant new frequency of oscillation, this new frequency of oscillation is the poor 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 in each radio-frequency module, cannot determine this frequency shift (FS), need to determine 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 carries out phase compensation to obtain signal of communication according to frequency shift (FS) to described sampled signal.
For instance, if be R (n) without the sampled signal of frequency deviation, between local carrier (oscillator signal being produced by crystal oscillator obtains after frequency synthesis) and base station signal, difference on the frequency is that Δ f(is described frequency shift (FS)), sample count value is n, the default sampling period is t
s, the initial phase deviation between oscillator signal and base station signal that crystal oscillator produces is Φ
init, the sampled signal of the output signal of any radio-frequency module output after over-sampling 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 default separately sampling period t
ssampled signal after sampling.Between described local carrier and base station signal, difference on the frequency is that Δ f is equivalent to the frequency shift (FS) between described output signal and the described base station signal of the required definite next self-corresponding radio-frequency module of described automatic frequency control module.
Further, the described phase compensator in each compensating module can (n) compensate φ=2 π × Δ f × n × t to the sampled signal R ' after sampling module sampling processing
sphase deviation, each sampled signal R ' after sampling module sampling processing (n) carries out by phase compensator separately the signal of communication R obtaining after phase compensation " be (n):
Can find out the signal of communication R of each compensating module output " (n) be that R (n) only exists fixing phase difference Φ without the sampled signal of frequency deviation
initthereby, " (n) and the separately Frequency Synchronization between the base station signal under communication pattern that realized each signal of communication R.
On the other hand, in described baseband chip 32, described utility module 323 and each communication module (as shown in Figure 3 communication module 3214, 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, exempted complicated clock handoff procedure.
It should be noted that, the radio frequency chip that the present embodiment provides and the structural representation of baseband chip are mainly used in the how logical mobile terminal of multimode.For single mode single-pass (being injection frequency) mobile terminal, also can adopt radio frequency chip that the present embodiment provides and the structure of baseband chip, by the output signal of radio frequency chip output first sample and obtained sampled signal, then sampled signal is passed through to phase compensation and realize and the Frequency Synchronization of base station signal.But owing to itself only needing a crystal oscillator in single radio frequency chip, therefore preferred mode is still carried out the frequency of synchronising base station signal by the frequency of direct this crystal oscillator of fine setting, and it is good frequently adopting radio frequency chip as shown in Figure 1 and the structural representation of baseband chip in mobile terminal at injection.
Based on the how logical radio frequency chip of mobile terminal of the above-mentioned multimode providing and the structure of baseband chip, the embodiment of the present invention also provides a kind of signal processing method of mobile terminal.The schematic flow sheet of the execution mode of the signal processing method of a kind of mobile terminal of the present invention 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: each described base station signal is processed to obtain corresponding output signal with 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: each described output signal is sampled to obtain corresponding sampled signal according to the default sampling period;
Step S5: utilize described frequency shift (FS) to carry out phase compensation to obtain corresponding signal of communication to each described sampled signal.
In specific embodiment, described step S2 specifically comprises: described oscillator signal is carried out to frequency synthesis to produce local carrier; The described base station signal receiving and described local carrier are carried out to mixing to generate mixed frequency signal; Remove out of band signal in described mixed frequency signal to obtain described output signal.The communication pattern of default sampling period in described step S4 based on different set.
Present embodiment is that the how logical radio frequency chip of mobile terminal of the multimode based on as shown in Figure 3 and the structure of baseband chip realize.In conjunction with reference to figure 3, in baseband chip 32, signal of communication described in each acquisition by the communication module processing corresponding with communication pattern, the reference clock of each communication module is to obtain after the oscillator signal conversion described crystal oscillator being produced by each phase-locked loop circuit of correspondence.
In present embodiment, the concrete implementation of each step can, with reference to the embodiment described in figure 3, 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; can utilize method and the technology contents of above-mentioned announcement to make possible variation and modification to technical solution of the present invention; therefore; every content that does not depart from technical solution of the present invention; any simple modification, equivalent variations and the modification above embodiment done according to technical spirit of the present invention, all belong to the protection range of technical solution of the present invention.
Claims (19)
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 the first radio-frequency module also comprises the crystal oscillator for generation of oscillator signal, and all described the second radio-frequency modules share described crystal oscillator; Described signal processing module is for processing to obtain output signal to described oscillator signal and the base station signal receiving;
Described baseband chip comprises multiple sampling module and compensating modules corresponding with each radio-frequency module respectively; Wherein, described sampling module is for sampling to obtain sampled signal according to the default sampling period to the described output signal of carrying out self-corresponding radio-frequency module; Described compensating module comprises automatic frequency control module and phase compensator; Wherein, described automatic frequency control module is for determining the frequency shift (FS) between described output signal and the described base station signal that carrys out self-corresponding radio-frequency module; 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.
2. mobile terminal according to claim 1, is characterized in that, described phase compensator is used for realizing following formula:
Wherein, R ' (n) represents according to the default sampling period the sampled signal of coming to obtain after the described output signal of self-corresponding radio-frequency module is sampled; R " (n) represents that each sampled signal R ' (n) carries out by phase compensator separately the signal of communication obtaining after phase compensation; Δ f represents described frequency shift (FS); N represents sample count value; t
srepresent the default sampling period.
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 used for receiving base station signal; Described frequency synthesizer is for carrying out frequency synthesis to produce local carrier to described oscillator signal; Described frequency mixer is for carrying out mixing to generate mixed frequency signal by the described base station signal receiving and described local carrier; The out of band signal that described low pass filter is used for removing described mixed frequency signal is to obtain described output signal.
4. mobile terminal according to claim 1, is characterized in that, described baseband chip also comprises corresponding with each radio-frequency module respectively communication module 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 that carrys 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 the starting of oscillation of described crystal oscillator and closing.
7. mobile terminal according to claim 1, is characterized in that, each radio-frequency module is the different communication pattern of correspondence respectively, and the described default sampling period is set based on communication pattern corresponding to radio-frequency module.
8. a signal processing method for mobile terminal, is characterized in that, comprising:
Receive the base station signal under at least one communication pattern;
Each described base station signal is processed to obtain corresponding output signal with the oscillator signal that crystal oscillator produces;
Determine the frequency shift (FS) between each described output signal and described base station signal;
Each described output signal is sampled to obtain corresponding sampled signal according to the default sampling period;
Utilize described frequency shift (FS) to carry out phase compensation to obtain corresponding signal of communication 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 according to the default sampling period the sampled signal of coming to obtain after the described output signal of self-corresponding radio-frequency module is sampled; R " (n) represents that each sampled signal R ' (n) carries out by phase compensator separately the signal of communication obtaining after phase compensation; Δ f represents described frequency shift (FS); N represents sample count value; t
srepresent the default sampling period.
10. the signal processing method of mobile terminal according to claim 8, is characterized in that, the oscillator signal of described base station signal and crystal oscillator generation is processed to obtain output signal and comprise:
Described oscillator signal is carried out to frequency synthesis to produce local carrier;
The described base station signal receiving and described local carrier are carried out to 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, the reference clock that by phase-locked loop circuit, described oscillator signal is converted to communication module, described communication module is for the treatment of the described signal of communication obtaining under corresponding communication pattern.
The signal processing method of 12. mobile terminals according to claim 8, is characterized in that, the communication pattern of described default sampling period based on different set.
13. 1 kinds of radio frequency chips, it is characterized in that, comprise the first radio-frequency module and at least one second radio-frequency module, wherein each radio-frequency module includes signal processing module, described the first radio-frequency module also comprises the crystal oscillator for generation of oscillator signal, and all described the second radio-frequency modules share described crystal oscillator; Described signal processing module is for processing to obtain output signal to described oscillator signal and the base station signal receiving.
14. radio frequency chips according to claim 13, is characterized in that, described signal processing module comprises antenna, frequency synthesizer, frequency mixer and low pass filter; Wherein, described antenna is used for receiving base station signal; Described frequency synthesizer is for carrying out frequency synthesis to produce local carrier to described oscillator signal; Described frequency mixer is for carrying out mixing to generate mixed frequency signal by the described base station signal receiving and described local carrier; The out of band signal that described low pass filter is used for removing described mixed frequency signal is to obtain described output signal.
15. 1 kinds of baseband chips, is characterized in that, comprise multiple sampling module and compensating modules corresponding with each radio-frequency module in radio frequency chip described in claim 13 or 14 respectively; Wherein, described sampling module is for sampling to obtain sampled signal according to the default sampling period to the described output signal of carrying out self-corresponding radio-frequency module; Described compensating module comprises automatic frequency control module and phase compensator; Wherein, described automatic frequency control module is for determining the frequency shift (FS) between described output signal and the described base station signal that carrys out self-corresponding radio-frequency module; 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.
16. baseband chips according to claim 15, is characterized in that, described phase compensator is used for realizing following formula:
Wherein, R ' (n) represents according to the default sampling period the sampled signal of coming to obtain after the described output signal of self-corresponding radio-frequency module is sampled; R " (n) represents that each sampled signal R ' (n) carries out by phase compensator separately the signal of communication obtaining after phase compensation; Δ f represents described frequency shift (FS); N represents sample count value; t
srepresent the default sampling period.
17. baseband chips according to claim 15, is characterized in that, described baseband chip also comprises corresponding with each radio-frequency module respectively communication module 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 that carrys out self-corresponding compensating module.
18. baseband chips according to claim 15, is characterized in that, described baseband chip also comprises utility module; Described oscillator signal is as the reference clock of described utility module.
19. baseband chips according to claim 15, is characterized in that, described baseband chip also comprises control module, and described control module is for controlling the starting of oscillation of described crystal oscillator and closing.
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