CN101577984A - Method for reducing interference in transmission at a CDMA frequency band from WCDMA frequency band in double-mode mobile phone - Google Patents
Method for reducing interference in transmission at a CDMA frequency band from WCDMA frequency band in double-mode mobile phone Download PDFInfo
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- CN101577984A CN101577984A CNA2008101060061A CN200810106006A CN101577984A CN 101577984 A CN101577984 A CN 101577984A CN A2008101060061 A CNA2008101060061 A CN A2008101060061A CN 200810106006 A CN200810106006 A CN 200810106006A CN 101577984 A CN101577984 A CN 101577984A
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- 230000005540 biological transmission Effects 0.000 title abstract description 5
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- 238000004891 communication Methods 0.000 description 9
- 238000010295 mobile communication Methods 0.000 description 5
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Abstract
The invention discloses a method for reducing the interference in transmission at a CDMA frequency band from a WCDMA frequency band in a WCDMA and CDMA double-mode mobile phone. The method comprises the following steps: performing the optimization design of an antenna switch of WCMA; adding a resistor as a load in an idle branch; and at the same time, if voltage leakage occurs at the interface of the antenna switch, adding a blocking condenser. The method can effectively reduce and avoid the interference in the transmission at a CDMA frequency band from the WCDMA frequency band. The method can realize high-performance WCDMA and CDMA double-mode mobile phone and meet market demands.
Description
Technical field
The present invention relates to electronic product, refer in particular to communication product, as mobile phone, base station etc.
Background technology
At present because WorldCom's industry is in the ascendant, new standard and new frequency range constantly occur, and communication product can be placed on two kinds of solutions in the system for the two or more standards of compatibility, between two systems with the interconnected realization communication of fairly simple communication bus.But, can there be the problem of phase mutual interference because two solutions are not considered compatible problem when design.This is present Radio Frequency Engineer urgent problem.
On WCDMA and CDMA dual-mode handset; usually have the problem of disturbing mutually of reception and emission the problem of disturbing mutually since the problem of disturbing mutually that receives need go to solve by agreement; the final solution of this problem needs the supplier of platform solution to go to solve; here not doing and set forth the problem of disturbing mutually that another is emission, briefly is exactly the emission index that one of them solution work meeting has influence on another solution.
Summary of the invention
On WCDMA and CDMA dual-mode handset, reduce the problem that the WCDMA frequency range is disturbed the CDMA band transmit for solving, need increase load for the branch road of zero load, if the duplexer port has drain voltage simultaneously, then also need to increase capacitance, thereby realize reducing or avoid the purpose of WCDMA frequency range to the interference of CDMA band transmit. through verification experimental verification, this method is feasible fully.
A solution provided by the invention is characterized in that increasing load for the branch road of zero load, if the duplexer port has drain voltage simultaneously, then also needs to increase capacitance.
Beneficial effect of the present invention is to realize high-performance WCDMA and CDMA dual-mode handset, meets the need of market.
Description of drawings
The existing dual-mode handset schematic diagram of Fig. 1;
Comprising the WCDMA of dual-mode handset part and CDMA part, use communication bus to connect between two parts. at WCDMA part and CDMA separately antenna switch module and radio-frequency (RF) transceiver module are arranged all partly. adopted unloaded mode at WCDMA antenna switch module partly for obsolete frequency range (GSM850);
Fig. 2 dual-mode handset schematic diagram of the present invention;
Comprising the WCDMA of dual-mode handset part and CDMA part, use communication bus to connect between two parts. in WCDMA part and CDMA part separately antenna switch module and radio-frequency (RF) transceiver module are arranged all. at WCDMA antenna switch module partly for obsolete frequency range (GSM850) increase capacitor C 1 and resistance R 1 load circuit as this frequency range.
The terminological interpretation of being correlated with in this specification
GSM Global System for Mobile communication, global system for mobile communications
A frequency range of GSM900 GSM standard. frequency is near 900MHz, so common name GSM900 frequency range
A frequency range of GSM850 GSM standard. frequency is near 850MHz, so common name GSM8500 frequency range
A frequency range of DCS1800GSM standard. frequency is near 1800MHz, so common name DCS1800 frequency range
A frequency range of PCS1900GSM standard. frequency is near 1900MHz, so common name PCS1800 frequency range
CDMA Code Division Multiple Access CDMA mobile communication systems
WCDMA Wideband Code Division Multiple Access WCDMA mobile communication system
A frequency range of WCDMA2100WCDMA standard. frequency is near 2100MHz, so common name WCDMA2100 frequency range
Dual-mode handset is realized two kinds of different standards on mobile phone, being generally called this mobile phone is dual-mode handset. for example WCDMA and GSM dual-mode handset, CDMA and GSM dual-mode handset etc.
Embodiment
Be better explanation the present invention, the present invention is further illustrated below by specific embodiment.
Be the schematic diagram of existing dual-mode handset as shown in Figure 1, what it formed that .WCDMA partly uses by two parts is the solution of high pass (Qualcomn) company, and what CDMA partly was to use is the solution of high pass (Qualcomn) company. these two parts use common communication bus to connect.
Wherein the frequency range of in the solution of WCDMA part Qualcomm antenna switch module not being used (GSM850) adopts unloaded mode. if a single mode mobile phone adopts such design is fully no problem. because the design that antenna switch module adopts hilted broadsword to throw more, can not work simultaneously between each frequency range, can not cause the interference of radio frequency. but in the dual-mode handset design, owing to adopted the solution of two families respectively, can not guarantee that WCDMA part and CDMA partly do not work simultaneously, this can cause two-part radio frequency mutual interference problem. and radio frequency mutual interference comprises the problem of disturbing mutually of reception and the problem of disturbing mutually of emission. because the problem of disturbing mutually that receives need go to solve by agreement, the final solution of this problem needs the supplier of platform solution to go to solve, here do not do elaboration. another is the problem of disturbing mutually of emission, briefly is exactly the emission index that one of them solution work meeting has influence on another solution.
After tested, the radio-frequency transmissions index of CDMA part can be subjected to the interference of WCDMA part, shake is always arranged in a flash, can find with the instrument test test, frequency error and phase error maximum can cause the error of CDMA part communication to strengthen at very big this that become in a flash, and serious meeting causes mobile communication to interrupt.
Be the schematic diagram of improved dual-mode handset as shown in Figure 2, what it formed that .WCDMA partly uses by two parts is the solution of Qualcomm, and what CDMA partly was to use is the solution of overseas Qualcomm. these two parts use common communication bus to connect.
Wherein increasing capacitor C 1 and resistance R 1 load circuit as this frequency range in the frequency range of in the solution of WCDMA part Qualcomm antenna switch module not being used (GSM850). improved purpose is that antenna also can be in the state that load resistance R1 is arranged when duplexer switches to the GSM850 frequency range, problem with regard to not causing emission to disturb mutually like this. simultaneously because the duplexer port has drain voltage, so increased capacitance C1.
After tested, test on the mobile phone after the improvement, the phenomenon disturbed does not appear in the radio-frequency transmissions index of CDMA part again. and frequency error and phase error maximum can remain on very stable numerical value always, and this illustrates that improved measure is effective.
In sum, the present invention is the branch road increase load for zero load, if the duplexer port has drain voltage simultaneously, then also needs to increase capacitance, thereby reduces the purpose that the dual-mode handset emission is disturbed mutually.
It should be apparent to those skilled in the art that the method that this reduction dual-mode handset emission is disturbed mutually can be used in other electronic product that uses double-standard or multi-modulation scheme.As be applied in multi-standard base station, in the products such as multi-modulation scheme intercom.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (2)
1, a kind of method of WCDMA frequency range to the CDMA band interference that reduce on WCDMA and CDMA dual-mode handset is characterized in that:
For resistance of branch road increase of zero load, as load.
2, a kind of method of WCDMA frequency range to the CDMA band interference that reduce on WCDMA and CDMA dual-mode handset according to claim 1 is characterized in that:
Connect an electric capacity to resistance, be used for every falling direct current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101060061A CN101577984A (en) | 2008-05-07 | 2008-05-07 | Method for reducing interference in transmission at a CDMA frequency band from WCDMA frequency band in double-mode mobile phone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101060061A CN101577984A (en) | 2008-05-07 | 2008-05-07 | Method for reducing interference in transmission at a CDMA frequency band from WCDMA frequency band in double-mode mobile phone |
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| Publication Number | Publication Date |
|---|---|
| CN101577984A true CN101577984A (en) | 2009-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008101060061A Pending CN101577984A (en) | 2008-05-07 | 2008-05-07 | Method for reducing interference in transmission at a CDMA frequency band from WCDMA frequency band in double-mode mobile phone |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1809970A (en) * | 2003-04-25 | 2006-07-26 | 艾利森电话股份有限公司 | Antenna switches including field effect transistors |
| CN1937816A (en) * | 2006-10-20 | 2007-03-28 | Ut斯达康通讯有限公司 | Dual-mode mobile communication terminal |
| CN101068400A (en) * | 2006-11-23 | 2007-11-07 | 中兴通讯股份有限公司 | A TD-SCDMA/GSM single-antenna mobile telephone double-mode double-standby realizing method |
-
2008
- 2008-05-07 CN CNA2008101060061A patent/CN101577984A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1809970A (en) * | 2003-04-25 | 2006-07-26 | 艾利森电话股份有限公司 | Antenna switches including field effect transistors |
| CN1937816A (en) * | 2006-10-20 | 2007-03-28 | Ut斯达康通讯有限公司 | Dual-mode mobile communication terminal |
| CN101068400A (en) * | 2006-11-23 | 2007-11-07 | 中兴通讯股份有限公司 | A TD-SCDMA/GSM single-antenna mobile telephone double-mode double-standby realizing method |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| DD01 | Delivery of document by public notice |
Addressee: China TechFaith Wireless Communication Technology Limited. Document name: Notification of Patent Invention Entering into Substantive Examination Stage |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20091111 |