CN102386937A - Wireless communication system and method for improving sensitivity of wireless communication system - Google Patents
Wireless communication system and method for improving sensitivity of wireless communication system Download PDFInfo
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Abstract
The invention discloses a wireless communication system and a method for improving sensitivity of the wireless communication system. The wireless communication system comprises a mobile communication antenna, a CPU (central processing unit) and a display module externally connected with the CPU, wherein a clock frequency of communication between the CPU and the display module is set, so that frequency values of nth harmonic wave and (n+1)th harmonic wave of the clock frequency avoid a receiving frequency band of the wireless communication system. In the invention, through changing the clock frequency, shielding, ensuring a Wlan antenna to be far away from the mobile communication antenna and improving signal completeness of an interface, wireless interference produced by higher harmonic radiated from a line to a system is weakened, thus wireless sensitivity of the wireless communication system is enhanced and system receiving performance is enhanced.
Description
Technical field
The invention belongs to the wireless communication system technologies field, specifically, relate to a kind of wireless communication system that is used to improve the wireless receiving sensitivity of method of communication equipment and adopts said method design.
Background technology
Along with the development of mobile technology with popularize; Mobile communication has obtained widespread usage in all kinds of portable terminals; Especially over the past two years the products such as panel computer that rose; Embedded such as multiple wireless applications such as second and third third-generation mobile communication 2G/3G network, Wlan (WLAN), bluetooth, GPS (global positioning system), mobile TVs, really realized integrating Mobile business, mobile communication, mobile entertainment.In the mobile Internet epoch, panel computer becomes PC and the optimal article that combine of smart mobile phone gradually with its brand-new mode of operation, abundant application experience, better mobility, and ideally the two function is rolled into one.
Simultaneously, along with the function of electronic product from strength to strength, processor speed is more and more faster, the demand of miniaturization, portability is more and more stronger, has brought very big challenge also for the design of circuit board.The internal circuit of electronic product becomes intensive and complicated, and clock frequency approximately every two years will promote one times, and the problems of Signal Integrity of high speed circuit becomes more and more outstanding, and incident is exactly sequential, noise, EMI problems such as (electromagnetic interference).When the frequency or the harmonic radiation of these high speed signals are come out, during by the receiver of antenna reception and entering communication system, will have a strong impact on receptivity, cause not having line sensitivity and reduce, signal quality descends.
Summary of the invention
The object of the present invention is to provide a kind of raising wireless communication system sensitivity of method, to improve the wireless receiving performance of communication class electronic product.
For solving the problems of the technologies described above, the present invention adopts following technical scheme to be achieved:
A kind of raising wireless communication system sensitivity of method; In said wireless communication system, include mobile communication antenna, CPU and the display module external with CPU; The clock frequency of CPU and display module communication is set, makes the frequency values of nth harmonic and the n+1 subharmonic of this clock frequency all avoid the reception frequency range of wireless communication system; Said n is a positive integer.
Preferably, the clock frequency that said CPU and display module communication is set is 108MHz.
For the wireless communication system that is provided with wireless local area network module; Said wireless local area network module is connected the Wlan antenna; And be connected with described CPU; Distance between Wlan antenna and the mobile communication antenna is set, makes two isolations between the antenna less than-20dB, with the no line sensitivity of the said wireless communication system of further raising.
Further; Said CPU connects described wireless local area network module through its first group of SDIO interface; Reduce the driving force of interface clock signal in first group of SDIO interface; And, also can further play the effect that improves the wireless communication system receptivity thus connecting series impedance build-out resistor on the clock cable of said interface clock signal.
If think the wireless receiving sensitivity of raising wireless communication system further; Can be employed in the driving force that reduces whole interface on the software to said first group of SDIO interface; And, make the CPU at holding wire two ends and wireless local area network module reach impedance matching connecting series impedance build-out resistor on each signal line of this SDIO interface.
For the wireless communication system that is provided with storage card; Can let CPU pass through its second group of SDIO interface and connect described storage card; Reduce the driving force of interface clock signal in second group of SDIO interface; And connecting series impedance build-out resistor on the clock cable of said interface clock signal, can weaken thus because the influence that the read-write operation of storage card causes the sensitivity of wireless communication system.
Further; If will obtain the more desirable effect of improving; Can on software, reduce the driving force of whole second group of SDIO interface; And, make the CPU at holding wire two ends and storage card reach impedance matching connecting series impedance build-out resistor on all holding wires of second group of SDIO interface, with the no line sensitivity of raising wireless communication system.
For the wireless communication system that is provided with the DDR memory; Can said DDR memory be connected described CPU through parallel bus; Said CPU, DDR memory and be connected parallel bus between the two above radome is set or covers conductive fabric; To avoid consequent electromagnetic interference signal to radiate, influence the no line sensitivity of system.
Further; In said wireless communication system, also include power module; In said power module, be provided with power inductance; Above said power inductance and connected cabling, be provided with radome or be coated with conductive fabric, avoiding electromagnetic interference that power inductance and peripheral wiring thereof produce, the sensitivity of wireless communication system is exerted an influence to external radiation.
Based on above-mentioned raising wireless communication system sensitivity of method; The present invention also provides the said method design of a kind of employing wireless communication system; Comprise mobile communication antenna, CPU and the display module external with CPU; Through the clock frequency of CPU and display module communication is set; Make the frequency values of nth harmonic and the n+1 subharmonic of this clock frequency all avoid the reception frequency range of said wireless communication system, can solve the Harmonic Interference that when display screen is lighted, radiates thus, reach the purpose of design that improves wireless communication system sensitivity thus the problem that the no line sensitivity of wireless communication system impacts by clock line; Said n is a positive integer.
Preferably, said wireless communication system can be panel computer or smart mobile phone etc.
Compared with prior art; Advantage of the present invention and good effect are: the present invention is through adopting change clock frequency, shielding, improving method such as signal integrity and weaken the air interference that the high order harmonic component that radiates in the circuit produces system; Promote the no line sensitivity of wireless communication system thus, strengthened the receptivity of system.
After the detailed description in conjunction with the advantages embodiment of the present invention, other characteristics of the present invention and advantage will become clearer.
Description of drawings
Fig. 1 is the circuit framework sketch map of receiving unit in the existing wireless communications system;
Fig. 2 is the clock signal trace-diagram of CPU and peripheral circuit thereof in the wireless communication system;
Fig. 3 is the installation position sketch map of mobile communication antenna and Wlan antenna in the classic flat-plate computer;
Fig. 4 mobile communication antenna that to be the present invention propose for the no line sensitivity that improves system and the installation position sketch map between the Wlan antenna;
Fig. 5 is the laying sketch map of screen unit on system circuit board that the present invention proposes for the no line sensitivity that improves system.
Embodiment
Describe in detail below in conjunction with the accompanying drawing specific embodiments of the invention.
In the receiver of mobile communication terminal, receiving sensitivity is an important index very, is related to the distance of communication and the stability problem of signal.It is defined as, under the condition of the output signal-to-noise ratio of giving provisioning request, and the detected minimum incoming signal level of receiver institute ability, in GSM/TD-SCDMA (second generation/3G (Third Generation) Moblie technology) standard, unit generally representes with dBm.This index is relevant with the noise size of desired output signal-to-noise ratio, receiver.Sensitivity quantizes with formula:
P
in(min)(dBm)＝-174(dBm/Hz)+10logBW+NF(dB)+SNR
o，min(dB)。
In the formula, P
In (min)Be minimum power input, unit is dBm; The-174th, the thermal noise power spectrum density of system in the time of 17 ℃, unit is dBm/Hz; BW is a signal bandwidth, and unit is Hz; NF is a receiver noise factor, and unit is dB; SNR
O, minFor exporting minimum signal to noise ratio, unit is dB.
In wireless communication system, the circuit system of its receiving unit adopts structure form as shown in Figure 1 usually, promptly comprises chief components such as mobile communication antenna, duplexer and filter, receiving circuit, BBP.Wherein, The mobile communication signal that receives through mobile communication antenna transfers to receiving circuit via duplexer and filter circuit and separates and be in harmonious proportion behind the multistep treatment; And then transfer to BBP and carry out data processing, the vision signal of generation can be exported demonstration through the display screen in the system; The audio signal that generates can be play output through loud speaker in the system or earphone.
In the system design of wireless receiving part, run into two notions: conducted susceptibility and no line sensitivity through regular meeting.Wherein, the mode through wired conduction between receiving system and the signal source connects, and the sensitivity that records is conducted susceptibility, also claims to have line sensitivity.Mode through wireless coupling between receiving system and the signal source connects, and the sensitivity that records is no line sensitivity.The theoretical value of conducted susceptibility can be calculated according to above-mentioned formula and obtain.With general GSM receiver is that example describes, the noise factor NF=3dB of its receiver; Exporting minimum signal to noise ratio requires for SNR=6dB (the minimum signal to noise ratio that is the BBP input port requires to be 6dB); The bandwidth of gsm system is BW=200KHz, and then in Fig. 1, the minimum power input of receiving circuit input port is:
P
B(min)(dBm)＝-174(dBm/Hz)+10log(200×10
3)+3(dB)+6(dB)＝-112(dBm)
Because the loss of duplexer and filter is generally 3dB, then the minimum power input at the duplexer input port is:
P
A(min)(dBm)＝P
B(min)(dBm)+3(dB)＝-109(dBm)
That is to say that-109dBm promptly is the conducted susceptibility theoretical value of gsm system.
The efficient of supposing mobile communication antenna is 50% (general GSM antenna possibly also not reach this value), is equal to the device of a 3dB decay, takes mobile communication antenna into account so, and the no line sensitivity of whole GSM receiving system is:
P
radiation(min)(dBm)＝P
A(min)(dBm)+3(dB)＝-106(dBm)
The aforementioned calculation formula all is under no external interference environment, the quantitative formula of sensitivity.But in the open environment of reality, interference signal always can mix with useful signal, through arriving its output port behind the multistep treatment of receiving circuit, and then influences the signal to noise ratio of BBP input port.When intensity one timing of input signal, the interference signal that enters into system is strong more, and the signal to noise ratio of receiving circuit input port is more little, and the signal to noise ratio of receiving circuit output port is just more little so.So, when the external interference signal,, must improve the intensity of input signal in order to improve the signal to noise ratio of receiving circuit output port.System's minimum signal strength that can receive has just uprised i.e. sensitivity variation like this.
Can find out that from top analysis under the situation that conducted susceptibility is confirmed, improving no line sensitivity has two kinds of methods: a kind of is to improve antenna performance, and efficient is uprised; Second kind is the interference noise intensity that reduces the system that gets into.Present embodiment will be paid close attention to how reducing the interference noise that gets into receiving system; And be example with the receptivity of the 2G frequency range of the mobile communication GSM900 frequency range of panel computer and TD-SCDMA, provide a kind of and search, locate, analyze, reduce the method for interference.
How to judge the quality of no line sensitivity, can comprehensively judge through the no line sensitivity of test receiver under each operating state.With the panel computer is that example describes, and can light and extinguishes through the operation lcd screen, and WLAN Wlan opens and closes; And operation such as storage card read-write; Use the no line sensitivity of comprehensive tester test different channels, if test result less than national Specification-102dBm, then think qualified products; Otherwise, think substandard product.
In the design of the circuit system of panel computer, need connect multiple peripheral circuit in the periphery of central processor CPU, for example display module, wireless local area network module, jumbo storage card, DDR memory etc. are referring to shown in Figure 2.We find in actual test process, and interference noise generally produces through following approach:
(1) display screen (is that example describes with the LCD screen) when panel computer when lighting, is easy to radiate high order harmonic component from the clock cable that is connected between CPU and the display module, forms interference signal, and the no line sensitivity of panel computer is exerted an influence;
(2) CPU is carrying out in the process of data communication with its peripheral circuit; Such as carrying out in the process of exchanges data with the DDR memory, because the operating frequency of CPU is generally about 1GHz, the signal of its transmission often all is a high speed signal; Therefore be easy to generate frequency electromagnetic waves; Be radiated and just form electromagnetic interference in the system, be incorporated on the mobile communication antenna of panel computer, promptly the no line sensitivity to system impacts;
(3) after wlan capability starts; The Wlan antenna that connects wireless local area network module can be used as the propagation path of interference signal; The interference signal that produces CPU from system board is incorporated on the mobile communication antenna of panel computer, thereby influences the receptivity of system;
(4) after wlan capability starts; Be easy to give off high order harmonic component from the interface clock line that is connected between CPU and the wireless local area network module; And just fall in the reception band limits of system, thereby the no line sensitivity of system is produced obviously influence.
To the generation approach of above-mentioned four aspect interference noises, present embodiment has all proposed relative counter measures:
To above-mentioned (1) kind situation, present embodiment is through the clock frequency of change CPU and display module communication, makes the frequency values of nth harmonic and the n+1 subharmonic of this clock frequency all avoid the reception frequency range of panel computer, and said n is a positive integer.Thus, even give off Harmonic Interference, can the no line sensitivity of system not exerted an influence from the clock cable that is connected between CPU and the display module yet.
To above-mentioned (2) kind situation, present embodiment uses shielding material that CPU and peripheral circuit thereof are shielded.For example: CPU and DDR memory and be connected parallel bus between the two above radome is set or covers conductive fabric; HW High Way for connecting CPU also should place in the described radome, and the part that radome does not cover can use conductive fabric to wrap up, and comes out with the high-frequency electromagnetic wave excitation of avoiding producing, and system is formed interference noise.In addition; In the power circuit design of system, often need use power inductance; When power circuit is worked, also can produce high order harmonic component at the power inductance place, so present embodiment preferably is provided with radome or wraps up conductive fabric above said power inductance and external cabling thereof; To mask electromagnetic interference, further improve the wireless receiving performance of system by its generation.
To above-mentioned (3) kind situation, present embodiment adopts the design of Wlan antenna away from mobile communication antenna, makes two isolations between the antenna less than-20dB, to reduce the influence of Wlan antenna to mobile communication antenna.
To above-mentioned (4) kind situation; Present embodiment adopts the driving force that reduces the interface that CPU is connected with wireless local area network module from software; From the hardware on the holding wire that connects said interface the series impedance build-out resistor; So that reach the integrality that matching mode is improved signal between CPU and the wireless local area network module, and then improve the no line sensitivity of whole system.In the present embodiment; Said interface is with SDIO interface (SDIO; Be the english abbreviation of Secure Digital Input and Output Card, mean the secure digital input-output card, SDIO has defined a kind of Peripheral Interface on standard) describe for example; For the purpose of difference, said interface definition is first group of SDIO interface.
Certainly; Also can only on the clock cable SDIO1_CLK of said first group of SDIO interface, take this measure; Promptly only reduce the driving force of interface clock signal in first group of SDIO interface; Promptly reduce the size of output current, and connecting series impedance build-out resistor on the clock cable SDIO1_CLK of said interface clock signal.Though not as on whole interface, taking this measure more perfect, also the no line sensitivity of the reception of raising system significantly satisfies the designing requirement of whole system aspect improvement system receptivity.
In like manner, for the connecting interface between CPU and the storage card (be that example describes still, and be defined as second group of SDIO interface), also can adopt same design with the SDIO interface.Promptly on software, reduce the driving force of second group of SDIO interface or interface clock signal wherein; And connecting on all holding wires of second group of SDIO interface or series impedance build-out resistor on the clock cable SDIO3_CLK only; As shown in Figure 2; Make the CPU and the storage card at holding wire two ends reach impedance matching, with the no line sensitivity of further raising whole system.
Receptivity with the 2G frequency range of the mobile communication GSM900 frequency range of panel computer and TD-SCDMA is an example below, comes to set forth in detail to adopt above-mentioned method for designing that present embodiment proposed at the remarkable result that improves aspect the system wireless sensitivity through two concrete test cases.
Embodiment one, and (receiving band limits and be 925～960MHz) panel computer is that example describes to adopt mobile communication GSM900 frequency range.
Before the above-mentioned solution that does not adopt present embodiment to propose, panel computer is tested, its result is as shown in table 1:
Table 1
Can find out from test result:
1. the LCD screen is lighted, and whole channel (frequencies that each channel is corresponding different) is all had 5dBm above influence, especially 5 channels;
2. wireless local area network module (to call the Wlan module in the following text) is opened, and is very big to 5 channels and 124 channel effect;
3. storage card is carried out read-write operation, all very obvious to the influence of whole channel.
For interference noise, to set about from interference source, propagation path, sensitive equipment (antenna) three aspects respectively, the method below using is analyzed and is solved.
At first, utilize frequency spectrograph, use active probe to search interference source.After the panel computer start; On entire machine; Search respectively when LCD screen is lighted, the Wlan module is opened, spectrum component during storing card operation; So long as drop on panel computer the reception frequency range (in 925～960MHz) scopes, intensity greater than the signal of-80dBm, all is possible interference source approximately.To the panel computer model machine of experiment, scanning result is: when lighted when the LCD screen (1), making an uproar at the end of whole reception frequency range, (made an uproar in the end; Also claim background noise; Refer generally to the overall noise except that useful signal in the electroacoustics system, comprise noise and ambient noise two parts of system itself) all can near lifting, the especially 936MHz a very wide frequency spectrum projection be arranged; (specifically can finger mouth conversion chip at CPU and display module; After said CPU carries out the matching treatment of signal level through the interface conversion chip, connect described LCD screen, as shown in Figure 2) between clock cable LCD_PCLK on more obvious; (2) open the Wlan module, near 960MHz, occur a burr near the Wlan module, particularly at the clock cable place of interface; When (3) storage card being carried out read-write operation, make an uproar and all occur rising and falling in the end of whole reception frequency range, and amplitude is very big, and is the most obvious near the storage card circuit, especially on the clock cable of interface.
Above result is analyzed, and the clock signal LCD_PCLK of display module is a digital dock, and frequency is 72MHz, and on circuit board, this clock line is walked on the top layer, is easy to radiate form disturb.Its 13 subharmonic are 72MHz*13=936MHz, just in time drop on 5 channel center frequencies, so it is the most obvious to influence the sensitivity of 5 channels when lighting at LCD screen.To the influence of the clock frequency of 72MHz to 5 channels; Change the operating frequency of display module, for example change to the clock frequency of 108MHz, then its 8 subharmonic are 864MHz; 9 subharmonic are 972MHz, and the system that has just in time avoided panel computer receives frequency range 925～960MHz.Even the Harmonic Interference by its generation radiates like this, can not influence the no line sensitivity of system yet.After using this method, the sensitivity of 5 channels has promoted 5dBm.
Secondly, when lighting owing to the LCD screen make an uproar and all raised in the end of whole reception frequency range, so just can influence the sensitivity of whole channel.Through experimental verification is that the CPU ambient radiation is come out.Usually about 1GHz, the operating frequency of DDR memory is approximately 333MHz (triple-frequency harmonics is 999MHz) to the operating frequency of CPU, and is all very approaching with the reception frequency range, thereby the generation interference also is conspicuous.As shown in Figure 5; Use shielding material that CPU and peripheral circuits thereof are shielded; Preferably above CPU and peripheral circuit thereof, add radome 1, can use conductive fabric to wrap up for the part that does not have conductively-closed cover 1 to cover, as cpu chip, power inductance, DDR memory and with cabling that they are connected above add radome 1 or cover conductive fabric; To avoid coming out, form interference noise by the high-frequency electromagnetic wave excitation of its generation.
Once more, because the operating frequency of CPU can not be changed (the frequency reducing meeting produces very big influence to cpu performance), therefore can only try every possible means from propagation path.Find through experiment: the mobile communication antenna 2 of GSM900 is very near with the distance of Wlan antenna 3; Referring to shown in Figure 3; Wlan antenna 3 can be as the propagation path that disturbs; The interference noise that radiates CPU from mainboard is incorporated on the mobile communication antenna 2 of GSM900, thereby the no line sensitivity of system is exerted an influence.Wlan antenna 3 is laid in the position away from GSM900 mobile communication antenna 2; As shown in Figure 4; Use the isolation of two antennas 2,3 of network analyzer test; Make two antennas 2, the isolation between 3 less than-20dB, so just reduced the influence of the mobile communication antenna 2 of 3 couples of GSM900 of Wlan antenna.At this moment, the no line sensitivity of system during test storage card read-write operation also has significantly and to improve, and except that 124 channels, other channel all can reach-below the 102dBm.
At last; The interface clock frequency that test Wlan module is connected with CPU; Be the frequency of clock signal SDIO1_CLK, suppose that this clock frequency is 48MHz, its 20 subharmonic is 48MHz*20=960MHz; Just in time dropped on the centre frequency of 124 channels, so that the Wlan module is opened the sensitivity that influences 124 channels is the most obvious.Use oscilloscope test clock waveform can find to occur overshoot and ringing, this is typical problems of Signal Integrity.Take processing method: on software, reduce the driving force of SDIO interface, can reduce the size of current of whole SDIO interface, also can only reduce the wherein size of current of interface clock signal; On the hardware on the holding wire that connects the SDIO interface series matching resistor, such as 47 ohm resistance, make source end and terminal reach coupling.Through handling, the waveform overshoot and the ringing of two clock signals obviously improve, and test no line sensitivity, and influence disappears basically.Also can adopt the SDIO interface that storage card is connected with CPU that uses the same method and handle, with the no line sensitivity of further raising system.
After top several steps processing, test the no line sensitivity of the panel computer of mobile communication GSM900 frequency range once more, its test result is referring to shown in the table 2:
Table 2
Can find out that from test result when LCD screen was lighted, the Wlan module is opened and storage card carried out read-write operation, the no line sensitivity of whole system was all less than-102dBm, thereby satisfy the designing requirement of the qualified products of national Specification.
Embodiment two, and (receiving band limits and be 2010～2025MHz) panel computer is that example describes to adopt mobile communication TD-SCDMA 2G frequency range.
Before the raising of not adopting present embodiment to propose does not have the line sensitivity solution, panel computer is tested, its result is as shown in table 3:
Table 3
Copy embodiment one described method, at first adopt the mode that installs radome additional or wrap up conductive fabric to shield the cpu chip on the mainboard and peripheral circuit, DDR memory and power inductance and external cabling thereof; The mode that also can adopt radome to combine with conductive fabric shields the frequency electromagnetic waves that produces in the circuit; Promptly at first above the device that is prone to the generation electromagnetic interference signal on the mainboard, radome is installed; The part that does not cover for radome re-uses conductive fabric and wraps up; Avoiding electromagenetic wave radiation to come out to form interference noise, the receptivity of system is impacted.
Then, two groups of SDIO interfaces of CPU connection DDR memory and storage card are handled: the driving force that on software, reduces by two groups of SDIO interfaces on the one hand; On hardware, set up impedance matching resistance on the other hand and be connected in the holding wire that is connected with said SDIO interface, to improve the signal integrity of SDIO interface.
After adopting above-mentioned measure, though the no line sensitivity of system makes moderate progress, desirable not enough, no line sensitivity still receives the influence of display module work clock LCD_PCLK.Because the reception band limits of the 2G frequency range of mobile communication TD-SCDMA is 2010～2025MHz; When the frequency of the work clock LCD_PCLK of display module is 72MHz; Its 28 subharmonic is 72MHz*28=2016MHz; Just in time drop on the centre frequency of 10080 channels, have a strong impact on so the LCD screen can cause the no line sensitivity of 10080 channels when lighting.The frequency of the work clock LCD_PCLK of change display module is 108MHz, and its 18 subharmonic is 1944MHz, and 19 subharmonic are 2052MHz, have just in time avoided the reception frequency range 2010～2025MHz of system.Even the Harmonic Interference that the clock cable LCD_PCLK that is connected with display module from CPU like this produces radiates, can not have influence on the no line sensitivity of system yet.
At last, change the distance between Wlan antenna and the TD-SCDMA mobile communication antenna, make two isolations between the antenna, so just reduced of the influence of Wlan antenna the mobile communication antenna of TD-SCDMA less than-20dB.
The frequency of take above-mentioned shielding, improving signal integrity, the change display module work clock LCD_PCLK of SDIO is 108MHz, make of the measures such as mobile communication antenna of Wlan antenna away from TD-SCDMA after, test result is referring to shown in the table 4:
Table 4
Can find out from top test result: use the clock frequency of change display module, components and parts and HW High Way that commute produces frequency electromagnetic waves shield, improve interface signal integrity, make the Wlan antenna away from methods such as mobile communication antennas after, promoted the no line sensitivity of panel computer effectively.
Certainly, the wireless sensitivity of method of above-mentioned raising is equally applicable in other Wireless Telecom Equipments except that panel computer, such as smart mobile phone etc.
Should be noted that; The above only is a kind of preferred implementation of the present invention, for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (10)
1. one kind is improved the wireless communication system sensitivity of method; It is characterized in that: in said wireless communication system, include mobile communication antenna, CPU and the display module external with CPU; The clock frequency of CPU and display module communication is set, makes the frequency values of nth harmonic and the n+1 subharmonic of this clock frequency all avoid the reception frequency range of wireless communication system; Said n is a positive integer.
2. raising wireless communication system sensitivity of method according to claim 1 is characterized in that: the clock frequency that said CPU and display module communication are set is 108MHz.
3. raising wireless communication system sensitivity of method according to claim 1; It is characterized in that: in said wireless communication system, also comprise the wireless local area network module that is connected with CPU; Said wireless local area network module connects the Wlan antenna; Distance between Wlan antenna and the mobile communication antenna is set, makes two isolations between the antenna less than-20dB.
4. raising wireless communication system sensitivity of method according to claim 3; It is characterized in that: said CPU connects described wireless local area network module through first group of SDIO interface; Reduce the driving force of interface clock signal in first group of SDIO interface, and connecting series impedance build-out resistor on the clock cable of said interface clock signal.
5. raising wireless communication system sensitivity of method according to claim 3; It is characterized in that: said CPU connects described wireless local area network module through first group of SDIO interface; Reduce the driving force of first group of SDIO interface, and connecting series impedance build-out resistor on the holding wire of first group of SDIO interface.
6. raising wireless communication system sensitivity of method according to claim 1; It is characterized in that: in said wireless communication system, also include storage card; CPU connects described storage card through its second group of SDIO interface; Reduce the driving force of interface clock signal in second group of SDIO interface, and connecting series impedance build-out resistor on the clock cable of said interface clock signal.
7. raising wireless communication system sensitivity of method according to claim 6; It is characterized in that: in said wireless communication system, also include storage card; CPU connects described storage card through its second group of SDIO interface; Reduce the driving force of second group of SDIO interface, and connecting series impedance build-out resistor on the holding wire of second group of SDIO interface.
8. according to each described raising wireless communication system sensitivity of method in the claim 1 to 7; It is characterized in that: in said wireless communication system, also include the DDR memory; Connect described CPU through parallel bus, said CPU, DDR memory and be connected parallel bus between the two above be provided with radome or be coated with conductive fabric.
9. raising wireless communication system sensitivity of method according to claim 8; It is characterized in that: in said wireless communication system, also include power module; In said power module, be provided with power inductance, above said power inductance and connected cabling, be provided with radome or be coated with conductive fabric.
10. a wireless communication system is characterized in that: adopt like the described raising wireless communication system of each claim sensitivity of method in the claim 1 to 9.
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| CN201110327765.2A CN102386937B (en) | 2011-10-25 | 2011-10-25 | Wireless communication system and method for improving sensitivity of wireless communication system |
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| CN103813455A (en) * | 2012-11-07 | 2014-05-21 | 中国电信股份有限公司 | Long term evolution system parameter optimization allocation method and base station |
| CN104079849A (en) * | 2014-07-14 | 2014-10-01 | 深圳市康凯斯信息技术有限公司 | Television signal receiving device and mobile terminal with same |
| CN105376190A (en) * | 2014-07-31 | 2016-03-02 | 展讯通信（上海）有限公司 | Communication method based on GMSK modulation and method for detecting fixed frequency |
| CN105450242A (en) * | 2014-06-30 | 2016-03-30 | 展讯通信（上海）有限公司 | Method and device for improving receiving sensitivity of mobile terminal, and mobile terminal |
| CN105871477A (en) * | 2015-12-11 | 2016-08-17 | 乐视移动智能信息技术（北京）有限公司 | Method and apparatus for resisting to higher harmonic interference of camera MIPI (Mobile Industry Processor Interface) bus and mobile terminal |
| CN105871478A (en) * | 2015-12-11 | 2016-08-17 | 乐视移动智能信息技术（北京）有限公司 | Method and device for resisting high order harmonic interferences of display screen MIPI (Mobile Industry Processor Interface) bus, and mobile terminal |
| CN106027084A (en) * | 2016-05-18 | 2016-10-12 | 昆山龙腾光电有限公司 | Method and device for reducing noises |
| CN106612148A (en) * | 2016-12-15 | 2017-05-03 | 青岛海信移动通信技术股份有限公司 | Method and device for inhibiting interference of working frequency of CPU (Central Processing Unit) to transmitting and receiving module and terminal |
| CN107231201A (en) * | 2017-05-25 | 2017-10-03 | 奇酷互联网络科技（深圳）有限公司 | Alleviate method and electronic equipment of the display screen to antenna interference |
| WO2017206310A1 (en) * | 2016-05-30 | 2017-12-07 | 中兴通讯股份有限公司 | Method and device for adjusting lcd signal |
| CN109743066A (en) * | 2019-02-28 | 2019-05-10 | 重庆蓝岸通讯技术有限公司 | Terminal sensitivity reduction solution based on camera master clock adjustment, storage medium and terminal |
| JP2019078041A (en) * | 2017-10-23 | 2019-05-23 | トヨタ自動車株式会社 | Key unit |
| CN110299923A (en) * | 2019-06-28 | 2019-10-01 | 联想(北京)有限公司 | A kind of information configuring methods and electronic equipment |
| CN110365842A (en) * | 2019-07-12 | 2019-10-22 | 维沃移动通信有限公司 | A terminal control method and terminal equipment |
| CN110991571A (en) * | 2019-10-30 | 2020-04-10 | 宁波兰羚钢铁实业有限公司 | Material code scanning and warehousing information processing system and method based on ERP system |
| CN112511777A (en) * | 2020-10-30 | 2021-03-16 | 惠州高盛达科技有限公司 | Device and method for searching interference source of TV to WiFi module |
| CN112787500A (en) * | 2021-01-27 | 2021-05-11 | 展讯通信（上海）有限公司 | Control method, device, system, processor, terminal and medium of DC-DC converter |
| CN114980712A (en) * | 2022-04-26 | 2022-08-30 | 苏州浪潮智能科技有限公司 | Method and device for reducing electromagnetic radiation |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030198307A1 (en) * | 2002-04-19 | 2003-10-23 | Compaq Information | Dynamic clock control to reduce radio interference in digital equipment |
| US6999723B2 (en) * | 2001-11-29 | 2006-02-14 | Kyocera Wireless Corp. | System and method for reducing the effects of clock harmonic frequencies |
| CN101238679A (en) * | 2005-06-30 | 2008-08-06 | 英特尔公司 | Method, device and system for signal spectrum adjustment |
| CN101473545A (en) * | 2007-02-16 | 2009-07-01 | 松下电器产业株式会社 | Multichannel radio signal processing integrated circuit |
| CN101800563A (en) * | 2009-02-11 | 2010-08-11 | 华硕电脑股份有限公司 | Wireless transmitting and receiving method and wireless transmitting and receiving device using same |
-
2011
- 2011-10-25 CN CN201110327765.2A patent/CN102386937B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6999723B2 (en) * | 2001-11-29 | 2006-02-14 | Kyocera Wireless Corp. | System and method for reducing the effects of clock harmonic frequencies |
| US20030198307A1 (en) * | 2002-04-19 | 2003-10-23 | Compaq Information | Dynamic clock control to reduce radio interference in digital equipment |
| CN101238679A (en) * | 2005-06-30 | 2008-08-06 | 英特尔公司 | Method, device and system for signal spectrum adjustment |
| CN101473545A (en) * | 2007-02-16 | 2009-07-01 | 松下电器产业株式会社 | Multichannel radio signal processing integrated circuit |
| CN101800563A (en) * | 2009-02-11 | 2010-08-11 | 华硕电脑股份有限公司 | Wireless transmitting and receiving method and wireless transmitting and receiving device using same |
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| CN103813455A (en) * | 2012-11-07 | 2014-05-21 | 中国电信股份有限公司 | Long term evolution system parameter optimization allocation method and base station |
| CN105450242A (en) * | 2014-06-30 | 2016-03-30 | 展讯通信（上海）有限公司 | Method and device for improving receiving sensitivity of mobile terminal, and mobile terminal |
| CN104079849A (en) * | 2014-07-14 | 2014-10-01 | 深圳市康凯斯信息技术有限公司 | Television signal receiving device and mobile terminal with same |
| CN105376190B (en) * | 2014-07-31 | 2018-06-05 | 展讯通信（上海）有限公司 | The detection method of communication means and fixed frequency based on GMSK modulation |
| CN105376190A (en) * | 2014-07-31 | 2016-03-02 | 展讯通信（上海）有限公司 | Communication method based on GMSK modulation and method for detecting fixed frequency |
| CN105871477A (en) * | 2015-12-11 | 2016-08-17 | 乐视移动智能信息技术（北京）有限公司 | Method and apparatus for resisting to higher harmonic interference of camera MIPI (Mobile Industry Processor Interface) bus and mobile terminal |
| CN105871478A (en) * | 2015-12-11 | 2016-08-17 | 乐视移动智能信息技术（北京）有限公司 | Method and device for resisting high order harmonic interferences of display screen MIPI (Mobile Industry Processor Interface) bus, and mobile terminal |
| CN106027084B (en) * | 2016-05-18 | 2018-12-18 | 昆山龙腾光电有限公司 | Reduce the method and device of noise |
| CN106027084A (en) * | 2016-05-18 | 2016-10-12 | 昆山龙腾光电有限公司 | Method and device for reducing noises |
| WO2017206310A1 (en) * | 2016-05-30 | 2017-12-07 | 中兴通讯股份有限公司 | Method and device for adjusting lcd signal |
| CN107453837A (en) * | 2016-05-30 | 2017-12-08 | 中兴通讯股份有限公司 | The method of adjustment and device of LCD signal |
| CN106612148A (en) * | 2016-12-15 | 2017-05-03 | 青岛海信移动通信技术股份有限公司 | Method and device for inhibiting interference of working frequency of CPU (Central Processing Unit) to transmitting and receiving module and terminal |
| CN107231201A (en) * | 2017-05-25 | 2017-10-03 | 奇酷互联网络科技（深圳）有限公司 | Alleviate method and electronic equipment of the display screen to antenna interference |
| JP2019078041A (en) * | 2017-10-23 | 2019-05-23 | トヨタ自動車株式会社 | Key unit |
| CN109743066A (en) * | 2019-02-28 | 2019-05-10 | 重庆蓝岸通讯技术有限公司 | Terminal sensitivity reduction solution based on camera master clock adjustment, storage medium and terminal |
| US11455970B2 (en) | 2019-06-28 | 2022-09-27 | Lenovo (Beijing) Co., Ltd. | Information configuration method and electronic apparatus |
| CN110299923A (en) * | 2019-06-28 | 2019-10-01 | 联想(北京)有限公司 | A kind of information configuring methods and electronic equipment |
| CN110365842A (en) * | 2019-07-12 | 2019-10-22 | 维沃移动通信有限公司 | A terminal control method and terminal equipment |
| CN110991571A (en) * | 2019-10-30 | 2020-04-10 | 宁波兰羚钢铁实业有限公司 | Material code scanning and warehousing information processing system and method based on ERP system |
| CN112511777A (en) * | 2020-10-30 | 2021-03-16 | 惠州高盛达科技有限公司 | Device and method for searching interference source of TV to WiFi module |
| CN112511777B (en) * | 2020-10-30 | 2023-11-10 | 惠州高盛达科技有限公司 | Method for searching interference source of TV on WiFi module |
| CN112787500A (en) * | 2021-01-27 | 2021-05-11 | 展讯通信（上海）有限公司 | Control method, device, system, processor, terminal and medium of DC-DC converter |
| CN114980712A (en) * | 2022-04-26 | 2022-08-30 | 苏州浪潮智能科技有限公司 | Method and device for reducing electromagnetic radiation |
| CN114980712B (en) * | 2022-04-26 | 2024-01-19 | 苏州浪潮智能科技有限公司 | Method and device for reducing electromagnetic radiation |
| WO2024082792A1 (en) * | 2022-10-20 | 2024-04-25 | 北京智芯微电子科技有限公司 | Dual-mode fusion communication configuration method and configuration apparatus, and dual-mode fusion communication system |
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