CN103684484B - A kind of signal transmitting method, a kind of transmitter and a kind of electronic equipment - Google Patents
A kind of signal transmitting method, a kind of transmitter and a kind of electronic equipment Download PDFInfo
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- CN103684484B CN103684484B CN201310717755.9A CN201310717755A CN103684484B CN 103684484 B CN103684484 B CN 103684484B CN 201310717755 A CN201310717755 A CN 201310717755A CN 103684484 B CN103684484 B CN 103684484B
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Abstract
The invention discloses a kind of signal transmitting method, a kind of transmitter and a kind of electronic equipment, filter must be used could to eliminate or reduce the technical problem that in low-frequency range communication, local oscillator leakage disturbs reception band signal for solving the transmitter existed in prior art.The method is applied to transmitter, and described transmitter comprises a crystal oscillator, for generation of local oscillation signal; Described method comprises: according to the tranmitting frequency of the ascending resource determination signal to be transmitted of network allocation; If the described tranmitting frequency of described signal to be transmitted is less than setting threshold, then the output frequency of described crystal oscillator is set to first frequency, wherein, described first frequency meets the first predetermined relationship with the fundamental frequency of described crystal oscillator and the emission band at described tranmitting frequency place with the frequency difference of corresponding frequency acceptance band; Described signal to be sent is launched according to the described crystal oscillator after arranging.
Description
Technical field
The present invention relates to the communications field, particularly a kind of signal transmitting method, transmitter and electronic equipment.
Background technology
Radio-frequency front-end is the core component of communication equipment, and it is divided into transmitter and receiver two parts.Wherein, transmitter is responsible for baseband signal to carry out rf conversion, power amplification, and in the mode of microwave through antenna transmission radiofrequency signal.
Transmitter is formed primarily of low pass filter, local oscillation signal source, IQ (In-phase and Quadrature-phase, homophase phase place and quadrature phase) modulator, gain amplifier, power amplifier, duplexer and antenna.Although the principle of transmitter is fairly simple, its design relates to factors and interacts between each factor, and therefore, transmitter determines performance and the cost of whole communication equipment to a great extent.
Conventional transmitter architecture comprises super-heterodyne architecture, zero-if architecture and digital-if architecture etc.But no matter adopt which kind of structure, transmitter all can use local oscillation signal generation system and IQ modulating system.Due to these two parts spatially close together, and desirable isolation can not be reached between the local oscillator mouth of crystal oscillator and the mixing mouth of I/Q modulator, therefore, just inevitably there will be the situation of local oscillator leakage in transmitters, namely local oscillation signal exports frequency mixer to, defines mixing noise.
Especially in comparatively low-frequency range communicates, as the communications band lower than 1.4GHz, because emission band is very little with the spacing of corresponding frequency acceptance band, be generally 30 ~ 60MHz, the mixing noise causing the leakage of the local oscillator first-harmonic of transmitter or low-order harmonic (being less than 5 times) to generate in frequency mixer overlaps with frequency acceptance band, and then produce interference to received signal, greatly reduce the quality of communication.
Be [704,716] with the emission band residing for tranmitting frequency Tx, corresponding frequency acceptance band is the fundamental frequency f of [734,746] (unit is MHz), crystal oscillator
0for 19.2MHz is example, be described as follows:
During as Tx=706MHz, the frequency that its second harmonic reveals the mixing noise produced is 706 ± 2*19.2MHz, wherein 706+2*19.2=744.4MHz, is positioned at frequency acceptance band, will has an impact to received signal;
And for example during Tx=715MHz, the frequency that its first-harmonic reveals the mixing noise produced is 715 ± 19.2MHz, wherein 715+19.2=734.2MHz, is positioned at frequency acceptance band equally, can has an impact to received signal.
Especially, in LTE (Long Term Evolution, the Long Term Evolution) communication of high-speed communication, impact is to received signal even more serious, and it becomes the key issue needing solution badly.
In prior art, the mixing noise produced to suppress local oscillator leakage, to the interference of frequency acceptance band, generally increases the filter of a correspondence in frequency mixer rear end, filters out this mixing noise with this.
But increase the manufacturing cost that a filter not only can improve whole transmitter, but also can increase the volume of transmitter, the development trend of this and current electronics miniaturization is runed counter to.
Summary of the invention
The application provides a kind of signal transmitting method and transmitter, for solve in prior art exist transmitter must use filter could eliminate or reduce low-frequency range communication in local oscillator leakage to receive band signal interference technical problem.
First aspect, this application provides a kind of signal transmitting method, is applied to transmitter, and described transmitter comprises a crystal oscillator, for generation of local oscillation signal; Described method comprises: according to the tranmitting frequency of the ascending resource determination signal to be transmitted of network allocation; If the described tranmitting frequency of described signal to be transmitted is less than setting threshold, then the output frequency of described crystal oscillator is set to first frequency, described first frequency is the frequency values of the odd harmonic of the fundamental frequency of described crystal oscillator; Described signal to be transmitted is launched according to the described crystal oscillator after arranging.
Preferably, described crystal oscillator comprises selector switch and M branch circuit; Wherein, when described selector switch connects the N number of branch circuit in a described M branch circuit, described crystal oscillator exports the local oscillation signal of the frequency corresponding with described N number of branch circuit; Wherein, M be more than or equal to 2 positive integer, N is the positive integer being less than or equal to M; The described output frequency by described crystal oscillator is set to first frequency, be specially: calculate described first frequency, control described selector switch and connect the N number of branch circuit corresponding with described first frequency, make the output frequency of described crystal oscillator be described first frequency.
Preferably, described method also comprises: after described signal to be transmitted has been launched, and controls described selector switch and disconnects described branch circuit, makes the output frequency of described crystal oscillator be the described fundamental frequency of described crystal oscillator.
Preferably, described first frequency f=i*f
0; Wherein, i=2*int [(f
b/ f
0+ 1)/2]+1, f
0for the fundamental frequency of crystal oscillator, f
bfor the emission band at tranmitting frequency place and the frequency difference of corresponding frequency acceptance band, int [] is bracket function; Described method also comprises: after described signal to be transmitted has been launched, and the output frequency of described crystal oscillator is set to the described fundamental frequency of described crystal oscillator.
Second aspect, this application provides a kind of transmitter, comprising: crystal oscillator, for generation of local oscillation signal; Processor unit, for the tranmitting frequency of the ascending resource determination signal to be transmitted according to network allocation, and when described tranmitting frequency is less than setting threshold, the output frequency of described crystal oscillator is set to first frequency, launch described signal to be transmitted to make described transmitter according to the described crystal oscillator after arranging; Wherein, described first frequency is the frequency values of the odd harmonic of the fundamental frequency of described crystal oscillator.
Preferably, described crystal oscillator comprises selector switch and M branch circuit; Wherein, when described selector switch connects the N number of branch circuit in a described M branch circuit, described crystal oscillator exports the local oscillation signal of the frequency corresponding with described N number of branch circuit; Wherein, M be more than or equal to 2 positive integer, N is the positive integer being less than or equal to M.
Preferably, described processor unit is used for: when described tranmitting frequency is less than described setting threshold, the output frequency of described crystal oscillator is set to first frequency f=i*f
0, and after described signal to be transmitted has been launched, the output frequency of described crystal oscillator is set to the fundamental frequency of described crystal oscillator; Wherein, i=2*int [(f
b/ f
0+ 1)/2]+1, f
0for the fundamental frequency of crystal oscillator, f
bfor the emission band at tranmitting frequency place and the frequency difference of corresponding frequency acceptance band, int [] is bracket function.
The third aspect, the application provides a kind of electronic equipment, and described electronic equipment comprises the transmitter described in second aspect.
The one or more technical schemes provided in the embodiment of the present application, at least have following technique effect or advantage:
1, due in the embodiment of the present application, in comparatively LF communication (as lower than 1.4GHz), launching opportunity is according to the output frequency of preset formula setting crystal oscillator, the mixing noise that the local oscillation signal making it export and the leakage of harmonic wave thereof produce all drops on outside frequency acceptance band, and then eliminates the mixing noise impact to received signal that local oscillator leakage produces when not using special filter; And then solve the transmitter existed in prior art must use filter could eliminate or reduce low-frequency range communication in local oscillator leakage to receive band signal interference technical problem.
2, due in the embodiment of the present application, determine the output frequency of crystal oscillator at the processor of transmitter after, processor can indicate the selector switch in crystal oscillator to be connected in corresponding circuit branch, extra inductance and electric capacity is increased to oscillating circuit, and then exporting corresponding required frequency, whole crystal oscillator output frequency switching mode is quick and cost is very low.
Accompanying drawing explanation
Fig. 1 is the flow chart of signal transmitting method in the embodiment of the present application;
Fig. 2 is the circuit diagram of crystal oscillator in the embodiment of the present application;
Fig. 3 is the another flow chart of signal transmitting method in the embodiment of the present application;
Fig. 4 is the schematic diagram of transmitter in the embodiment of the present application.
Embodiment
The application provides a kind of signal transmitting method, transmitter and electronic equipment, for solve in prior art exist transmitter must use filter could eliminate or reduce low-frequency range communication in local oscillator leakage to receive band signal interference technical problem.
Below by accompanying drawing and specific embodiment, technical scheme is described in detail, the specific features being to be understood that in the embodiment of the present application and embodiment is the detailed description to technical scheme, instead of the restriction to technical scheme, when not conflicting, the technical characteristic in the embodiment of the present application and embodiment can combine mutually.
Embodiment 1
On the one hand, the application provides a kind of signal transmitting method by embodiment 1, is applied to a transmitter, and this transmitter comprises a crystal oscillator, for generation of local oscillation signal.This crystal oscillator is specifically as follows common crystal vibration (SPXO), voltage type crystal oscillator (VCXO), Temperature Compensated Crystal vibration (TCXO), thermostatic control formula crystal oscillation (OCXO), digit compensated crystal damage vibration (DCXO), microcomputer compensation crystal oscillator (MCXO) etc.Please refer to Fig. 1, this signal transmitting method comprises:
S101: according to the tranmitting frequency of the ascending resource determination signal to be transmitted of network allocation.
S102: if the tranmitting frequency of signal to be transmitted is less than setting threshold, then the output frequency of crystal oscillator is set to first frequency, wherein, first frequency meets the first predetermined relationship with the fundamental frequency of crystal oscillator and the emission band at tranmitting frequency place with the frequency difference of corresponding frequency acceptance band;
S103: launch signal to be transmitted according to the crystal oscillator after arranging.
I*f
0, wherein, i=2*int [(f
b/ f
0+ 1)/2]+1, f
0for the fundamental frequency of crystal oscillator, f
bfor the emission band at tranmitting frequency place and the frequency difference of corresponding frequency acceptance band, int [] expression rounds;
Below to be applied to the transmitter in mobile terminal (as mobile phone), elaborate the embodiment of the present application technical scheme.
First, in step S101, when main exhaling initiated by mobile phone, a call request (access burst pulse immediately) can be sent to base station, broadcast channel (the Broadcast Channel of base station, BCH), after receiving this call request, the coding of a string relevant service channel can be sent to mobile phone.After mobile phone receives this coding, processor decoding in mobile phone, get the Traffic Channel (TrafficChannel, TCH) that base station broadcast channel (BCH) distributes, thus the tranmitting frequency that network side is signal to be transmitted distribution can be obtained.
In step s 102, after mobile phone determines the frequency of signal to be transmitted, the processor in mobile phone can judge whether this tranmitting frequency is less than a setting threshold.In actual conditions, the embodiment of the present application one of ordinary skill in the art can rationally arrange this setting threshold setting threshold according to actual needs, high-frequency band and low frequency frequency range can be marked off by this setting threshold, as this setting threshold being set to 1.4GHz, 1GHz or 800MHz etc., the embodiment of the present application will not limit this.
After judged result shows that the tranmitting frequency of signal to be transmitted is lower than setting threshold, cell phone processor can calculate the first frequency corresponding with the tranmitting frequency of signal to be transmitted according to the first predetermined relationship.When crystal oscillator is determined, the fundamental frequency of crystal oscillator is also determined, and the frequency difference of the emission band at tranmitting frequency place and corresponding frequency acceptance band and tranmitting frequency corresponding, so first frequency is uniquely determined by the tranmitting frequency of signal to be transmitted.
In the embodiment of the present application 1, in order to avoid or reduce crystal oscillator local oscillator leakage to receiving the interference of band signal, first frequency is set to the humorous wave frequency of crystal oscillator fundamental signal; Preferably, in order to avoid even-order harmonic is as other negative effects caused during output frequency, first frequency can be defined as the odd harmonic frequencies of the fundamental frequency of crystal oscillator.
Concrete, the first predetermined relationship can be:
f＝i*f
0；i＝2*int[(f
b/f
0+1)/2]+1
Wherein f is first frequency, f
0for the fundamental frequency of crystal oscillator, f
bfor the emission band at tranmitting frequency place and the frequency difference of corresponding frequency acceptance band, int [] is bracket function.Calculate the output frequency i*f of crystal oscillator
0, f in formula
0for the fundamental frequency of crystal oscillator, f
bfor the emission band at tranmitting frequency place and the frequency difference of corresponding frequency acceptance band, int [] is bracket function.
Be [704,716] with the emission band residing for tranmitting frequency Tx below, corresponding frequency acceptance band is the fundamental frequency f of [734,746] (unit is MHz), crystal oscillator
0for 19.2MHz is that example is described.
The frequency difference f of emission band and corresponding frequency acceptance band
b=746-704=42, i=2*int [(f
b/ f
0+ 1)/2]+1=2*int [(42/19.2+1)/2]+1=3.
Therefore, the output of crystal oscillator is set to 3*19.2=57.6, then the frequency that the first-harmonic (first harmonic) that crystal oscillator exports reveals the mixing noise signal produced is Tx ± 57.6.
And Tx-57.6<716-57.6<734, and Tx+57.6>704+57.6=761.6>746, therefore, first-harmonic is revealed the mixed frequency signal produced and is positioned at outside frequency acceptance band, can not produce interference to received signal.
And the frequency of the harmonic wave (secondary and above harmonic wave) that crystal oscillator exports is N*57.6, N is harmonic number, is not difficult to find out Tx ± N*57.6 more away from frequency acceptance band, also can not produce interference to received signal.
To sum up, when after the frequency of the odd harmonic output frequency of crystal oscillator being set to crystal oscillator fundamental signal, the mixing noise interference to received signal that local oscillator leakage produces can just be avoided.
The concrete mode output frequency of crystal oscillator being changed to first frequency is switched by the selector switch in crystal oscillator to connect different branch circuits, to increase extra capacitor and inductor in oscillating circuit, and then the frequency needed for exporting.
In step s 103, when after the output frequency setting crystal oscillator, the local oscillation signal of the first frequency of the output of crystal oscillator is through phase-locked loop (Phase Locked Loop, PLL) be amplified to tranmitting frequency Tx and form carrier wave, carrier wave and baseband signal form modulated wave through I/Q modulator modulation, go out after amplification through antenna transmission.
In addition, in a practical situation, step 101 also comprises the situation of mobile phone called party, the broadcast channel (BCH) being specially base station sends call information, after mobile phone receives from paging channel (Paging Channel, PCH), at Random Access Channel (Random access channel, RACH) send channel request to base station on, when remaining process is exhaled with mobile phone master, process is identical, and the embodiment of the present application does not repeat them here.
Therefore, adopt the embodiment of the present application technical scheme, can realize not frequency mixer rear end additionally add one obtain situation for the filter removing local oscillator leakage mixing noise under, eliminate the mixing noise interference to received signal that local oscillator leakage produces.
In a practical situation, the signal transmitting method in the embodiment of the present application, except being applied on the transmitter of mobile terminal, can also be applied on the transmitter of base station, its concrete principle and mobile terminal similar.
First, the processor of base station transmitter is according to the tranmitting frequency Tx of the ascending resource determination signal to be transmitted of network allocation;
Then, processor judges whether this tranmitting frequency Tx is less than setting threshold;
When this tranmitting frequency is less than setting threshold, the output frequency that processor calculates crystal oscillator according to the first predetermined relationship is first frequency, and indicate crystal oscillator by switching over or change capacitor and inductor numerical value (or two kinds of modes combine), with the local oscillation signal making crystal oscillator output frequency be first frequency.
Then this output frequency is amplified to tranmitting frequency Tx and forms carrier wave by phase-locked loop, and carrier wave and baseband signal form modulated wave through I/Q modulator modulation, go out after amplification through antenna transmission.
In the embodiment of the present application, in step s 102, if determine that the tranmitting frequency of signal to be transmitted is greater than setting threshold, now, the output frequency of crystal oscillator will not adjust, and remain its fundamental frequency f
0constant.Transmitter will launch signal to be transmitted based on this fundamental frequency local oscillation signal.
In actual applications, the following situation also likely occurred:
The mixing noise only having a certain high order harmonic component of the output frequency of crystal oscillator (as being greater than the harmonic wave of 5 times) to leak to frequency mixer generation is just understood overlapping with frequency acceptance band, namely the mixing noise only having the leakage of high-order harmonic wave to generate just can produce interference to received signal, that is the i calculated is greater than 5.
Because the energy component of high-order harmonic wave is very little, its mixing noise impact to received signal produced can be ignored.Consider the demand reducing power consumption, in such cases, the output fundamental frequency of crystal oscillator can not be amplified to i*f
0, but allow the output frequency of crystal oscillator remain its fundamental frequency f
0.Certainly, if do not consider power consumption, only consider from the angle avoiding local oscillator leakage to produce interference to received signal, in this situation, the output frequency of crystal oscillator is adjusted to i*f
0remain desirable.
In addition, in the embodiment of the present application technical scheme, be only limited to tranmitting frequency when being less than setting threshold, just can based on the output frequency of preset formula adjustment crystal oscillator.And in actual applications, output frequency can be limited to a certain frequency separation by the embodiment of the present application one of ordinary skill in the art more neatly.That is, in step s 102, when only having the output frequency determining signal to be transmitted to be positioned at a predeterminated frequency interval, during as being positioned in [60MHz, 800MHz] interval, just according to preset formula i=2*int [(f
b/ f
0+ 1)/2]+1 the output frequency of crystal oscillator is adjusted to i*f
0.Such setting can allow the adjustment of the local oscillation signal of transmitter have more specific aim.The application is intended to protect this flexible program equally.
As previously mentioned, in the embodiment of the present application, provide as under type realizes allowing crystal oscillator output frequency be the local oscillation signal of the first frequency determined by the first predetermined relationship.The method is:
Selector switch and M branch circuit; Wherein, when selector switch connects the N number of branch circuit in M branch circuit, crystal oscillator exports the local oscillation signal of the frequency corresponding with N number of branch circuit; Wherein, M be more than or equal to 2 positive integer, N is the positive integer being less than or equal to M;
The output frequency of crystal oscillator is set to first frequency, is specially:
Calculate first frequency, control selector switch and connect the N number of branch circuit corresponding with first frequency, make the output frequency of crystal oscillator be first frequency.
Be explained below in conjunction with accompanying drawing 2 pairs of said methods.
Due to the emission band of low-frequency range and frequency acceptance band spacing less, i.e. frequency difference f
bless (being generally 30 ~ 60MHz), the fundamental frequency of crystal oscillator is generally 15 ~ 30MHz in addition, therefore, according to formula i=2*int [(f in actual conditions
b/ f
0+ 1)/2]+1 i calculated is generally 3, so introduce the output frequency of crystal oscillator below by f
0be adjusted to 3*f
0mode.
The output frequency calculating crystal oscillator when the processor of transmitter is 3*f
0, processor can send switching command to crystal oscillator, and crystal oscillator responds this instruction, and selector switch k being connected to output frequency is 3*f
0the circuit branch of correspondence.
In fig. 2, JT is crystalline material, C
1=C
2when=0.2pF, selector switch k disconnect, output fundamental frequency is 26MHz;
And C
3=0.036pF, L
3=140uH, then, when K closes, output frequency will become to 26*3=78MHz.
Visible, by the operating state of switching selection switch k, make its closed or connection branch circuit, can realize the output frequency of crystal oscillator at f
0and 3*f
0between switch.
For i=5,7,9 ... etc. situation, as long as increase corresponding circuit branch, and capacitance in reasonable set circuit branch and inductance value, make to export respective frequencies value when selector switch connects this circuit branch, illustrate no longer one by one in this embodiment of the present application.
Example is the local oscillation signal that selector switch realizes exporting required frequency when connecting single branch road above, in actual conditions, realizes the local oscillation signal exporting target frequency when selector switch also can connect multiple branch road at the same time.
Certainly, in a practical situation, in order to reduce crystal oscillator electronic devices and components used, variable capacitance and variable inductance can be used, by rationally changing the numerical value of variable capacitance and variable inductance, in conjunction with the switching of the connection status of selector switch, while the required frequency of output, components and parts number in crystal oscillator can be reduced as far as possible.
In the embodiment of the present application, at the end of signal is launched, when namely therefore once having communicated, the circuit of crystal oscillator will restore.Please refer to Fig. 3, the embodiment of the present application signal transmitting method also comprises:
S104: after signal to be transmitted has been launched, is set to first frequency by the output frequency of crystal oscillator.
When the output frequency of crystal oscillator changes especially by selector switch connection respective branches circuit realiration, step S104 is specially:
After signal to be transmitted has been launched, control selector switch and disconnected branch circuit, made the output frequency of crystal oscillator be the fundamental frequency of crystal oscillator.And then make crystal oscillator Rapid reset so that upper once transmit time, can based on preset the first predetermined relationship export correct first frequency.
Embodiment 2
Corresponding with the signal transmitting method that embodiment 1 provides, the application provides a kind of transmitter by embodiment 2, please refer to Fig. 4, and this transmitter comprises:
Crystal oscillator 10, for generation of local oscillation signal;
Processor unit 20, for the tranmitting frequency of the ascending resource determination signal to be transmitted according to network allocation, and when tranmitting frequency is less than setting threshold, the output frequency of crystal oscillator is set to first frequency, launch signal to be transmitted to make transmitter according to the crystal oscillator after arranging; Wherein, first frequency meets the first predetermined relationship with the fundamental frequency of crystal oscillator and the emission band at tranmitting frequency place with the frequency difference of corresponding frequency acceptance band.
In the embodiment of the present application, due in comparatively LF communication (as lower than 1.4GHz), launching opportunity is according to the output frequency of preset formula setting crystal oscillator, the mixing noise that the local oscillation signal making it export and the leakage of harmonic wave thereof produce all drops on outside frequency acceptance band, and then eliminates the mixing noise impact to received signal that local oscillator leakage produces when not using special filter; And then solve the transmitter existed in prior art must use filter could eliminate or reduce low-frequency range communication in local oscillator leakage to receive band signal interference technical problem.
The concrete mode output frequency of crystal oscillator being changed to first frequency is switched by the selector switch in crystal oscillator to connect different branch circuits, to increase extra capacitor and inductor in oscillating circuit, and then the frequency needed for exporting.
That is, in the embodiment of the present application, crystal oscillator 10 comprises selector switch and M branch circuit; Wherein, when selector switch connects the N number of branch circuit in M branch circuit, crystal oscillator exports the local oscillation signal of the frequency corresponding with N number of branch circuit; Wherein, M be more than or equal to 2 positive integer, N is the positive integer being less than or equal to M.
In the embodiment of the present application, at the end of signal is launched, when namely therefore once having communicated, the circuit of crystal oscillator will restore.That is, processor unit 20 is also for after signal to be transmitted has been launched, and the output frequency of crystal oscillator 10 is set to the fundamental frequency of crystal oscillator.。
Embodiment 3
The application provides a kind of electronic equipment by embodiment 3, and this electronic equipment can be specifically mobile terminal, or base station equipment.This electronic equipment comprises the transmitter related in embodiment 2.
Various signal processing mode in signal transmitting method in embodiment 1 and instantiation are equally applicable to the electronic equipment in the transmitter of embodiment 2 and embodiment 3, by in embodiment 1 to the detailed description of signal transmitting method, those skilled in the art clearly can know the implementation method of the electronic equipment in the transmitter of embodiment 2 and embodiment 3, so succinct in order to specification, be not described in detail in this.
The one or more technical schemes provided in the embodiment of the present application, at least have following technique effect or advantage:
1, due in the embodiment of the present application, in comparatively LF communication (as lower than 1.4GHz), launching opportunity is according to the output frequency of preset formula setting crystal oscillator, the mixing noise that the local oscillation signal making it export and the leakage of harmonic wave thereof produce all drops on outside frequency acceptance band, and then eliminates the mixing noise impact to received signal that local oscillator leakage produces when not using special filter; And then solve the transmitter existed in prior art must use filter could eliminate or reduce low-frequency range communication in local oscillator leakage to receive band signal interference technical problem.
2, due in the embodiment of the present application, determine the output frequency of crystal oscillator at the processor of transmitter after, processor can indicate the selector switch in crystal oscillator to be connected in corresponding circuit branch, extra inductance and electric capacity is increased to oscillating circuit, and then exporting corresponding required frequency, whole crystal oscillator output frequency switching mode is quick and cost is very low.
Those skilled in the art should understand, the embodiment of the application can be provided as method, system or computer program.Therefore, the application can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the application can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.
The application describes with reference to according to the flow chart of the method for the embodiment of the present application, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Specifically, the computer program instructions that information processing method in the embodiment of the present application is corresponding can be stored in CD, hard disk, on the storage mediums such as USB flash disk, read by an electronic equipment when the computer program instructions corresponding with information processing method in storage medium or when being performed, comprise the steps:
According to the tranmitting frequency of the ascending resource determination signal to be transmitted of network allocation;
If the described tranmitting frequency of described signal to be transmitted is less than setting threshold, then the output frequency of described crystal oscillator is set to first frequency, wherein, described first frequency meets the first predetermined relationship with the fundamental frequency of described crystal oscillator and the emission band at described tranmitting frequency place with the frequency difference of corresponding frequency acceptance band;
Described signal to be transmitted is launched according to the described crystal oscillator after arranging.
Optionally, other computer instruction is also stored in described storage medium, these computer instructions with step: launching after computer instruction corresponding to described signal to be transmitted is performed according to the described crystal oscillator after arranging and be performed, comprising the steps: when being performed
After described signal to be transmitted has been launched, the output frequency of described crystal oscillator is set to the described fundamental frequency of described crystal oscillator.
Although described the preferred embodiment of the application, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the application's scope.
Obviously, those skilled in the art can carry out various change and modification to the application and not depart from the spirit and scope of the application.Like this, if these amendments of the application and modification belong within the scope of the application's claim and equivalent technologies thereof, then the application is also intended to comprise these change and modification.
Claims (8)
1. a signal transmitting method, is applied to transmitter, and described transmitter comprises a crystal oscillator, for generation of local oscillation signal; Described method comprises:
According to the tranmitting frequency of the ascending resource determination signal to be transmitted of network allocation;
If the described tranmitting frequency of described signal to be transmitted is less than setting threshold, then the output frequency of described crystal oscillator is set to first frequency, described first frequency is the frequency values of the odd harmonic of the fundamental frequency of described crystal oscillator;
Described signal to be transmitted is launched according to the described crystal oscillator after arranging.
2. the method for claim 1, is characterized in that:
Described crystal oscillator comprises selector switch and M branch circuit; Wherein, when described selector switch connects the N number of branch circuit in a described M branch circuit, described crystal oscillator exports the local oscillation signal of the frequency corresponding with described N number of branch circuit; Wherein, M be more than or equal to 2 positive integer, N is the positive integer being less than or equal to M;
The described output frequency by described crystal oscillator is set to first frequency, is specially:
Calculate described first frequency, control described selector switch and connect the N number of branch circuit corresponding with described first frequency, make the output frequency of described crystal oscillator be described first frequency.
3. method as claimed in claim 2, it is characterized in that, described method also comprises:
After described signal to be transmitted has been launched, control described selector switch and disconnected described branch circuit, made the output frequency of described crystal oscillator be the described fundamental frequency of described crystal oscillator.
4. method as claimed in claim 1 or 2, is characterized in that, described first frequency f=i*f
0; Wherein, i=2*int [(f
b/ f
0+ 1)/2]+1, f
0for the fundamental frequency of crystal oscillator, f
bfor the emission band at tranmitting frequency place and the frequency difference of corresponding frequency acceptance band, int [] is bracket function; Described method also comprises:
After described signal to be transmitted has been launched, the output frequency of described crystal oscillator is set to the described fundamental frequency of described crystal oscillator.
5. a transmitter, comprising:
Crystal oscillator, for generation of local oscillation signal;
Processor unit, for the tranmitting frequency of the ascending resource determination signal to be transmitted according to network allocation, and when described tranmitting frequency is less than setting threshold, the output frequency of described crystal oscillator is set to first frequency, launch described signal to be transmitted to make described transmitter according to the described crystal oscillator after arranging; Wherein, described first frequency is the frequency values of the odd harmonic of the fundamental frequency of described crystal oscillator.
6. transmitter as claimed in claim 5, it is characterized in that, described crystal oscillator comprises selector switch and M branch circuit; Wherein, when described selector switch connects the N number of branch circuit in a described M branch circuit, described crystal oscillator exports the local oscillation signal of the frequency corresponding with described N number of branch circuit; Wherein, M be more than or equal to 2 positive integer, N is the positive integer being less than or equal to M.
7. the transmitter as described in claim 5 or 6, is characterized in that, described processor unit is used for: when described tranmitting frequency is less than described setting threshold, the output frequency of described crystal oscillator is set to first frequency f=i*f
0, and after described signal to be transmitted has been launched, the output frequency of described crystal oscillator is set to the fundamental frequency of described crystal oscillator; Wherein, i=2*int [(f
b/ f
0+ 1)/2]+1, f
0for the fundamental frequency of crystal oscillator, f
bfor the emission band at tranmitting frequency place and the frequency difference of corresponding frequency acceptance band, int [] is bracket function.
8. an electronic equipment, is characterized in that, described electronic equipment comprises the transmitter as described in claim 5,6 or 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310717755.9A CN103684484B (en) | 2013-12-23 | 2013-12-23 | A kind of signal transmitting method, a kind of transmitter and a kind of electronic equipment |
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| CN1549622A (en) * | 2003-05-23 | 2004-11-24 | 乐金电子（中国）研究开发中心有限公 | Method and apparatus for carrier deviation estimation in mobile communication system |
| CN101567705A (en) * | 2009-03-31 | 2009-10-28 | 中兴通讯股份有限公司 | Mobile terminal and uplink channel local frequency regulation method |
| CN102006436A (en) * | 2009-09-01 | 2011-04-06 | 夏普株式会社 | Front-end circuit, tuner, and television broadcasting receiver |
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| JP2001230695A (en) * | 2000-02-16 | 2001-08-24 | Nec Corp | Radio equipment and frequency conversion method to be used therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1549622A (en) * | 2003-05-23 | 2004-11-24 | 乐金电子（中国）研究开发中心有限公 | Method and apparatus for carrier deviation estimation in mobile communication system |
| CN101567705A (en) * | 2009-03-31 | 2009-10-28 | 中兴通讯股份有限公司 | Mobile terminal and uplink channel local frequency regulation method |
| CN102006436A (en) * | 2009-09-01 | 2011-04-06 | 夏普株式会社 | Front-end circuit, tuner, and television broadcasting receiver |
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