CN1889400A - Multi-mode cell phone capable of suppressing PHS mode radio frequency interference - Google Patents
Multi-mode cell phone capable of suppressing PHS mode radio frequency interference Download PDFInfo
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- CN1889400A CN1889400A CN 200610106873 CN200610106873A CN1889400A CN 1889400 A CN1889400 A CN 1889400A CN 200610106873 CN200610106873 CN 200610106873 CN 200610106873 A CN200610106873 A CN 200610106873A CN 1889400 A CN1889400 A CN 1889400A
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Abstract
This invention discloses a multi-mode cell phone capable of suppressing the interference of PHS RF signals to non-PHS units including: a PHS unit and at least one non-PHS unit including a RF receiving circuit, in which, said non-PHS communication system includes a trapper connected to the front of the RF receiving circuit and the filter property of said filter stops signals of the control channel of the PHS unit from entering into the RF receiving circuit.
Description
Technical field
The present invention relates to a kind of mobile communication technology, particularly a kind of multi mode terminal that can effectively suppress the radio frequency interference of PHS pattern.
Background technology
At present, the standard of domestic mobile communication mainly contains three kinds: GSM (global system for mobile communications), CDMA (code division multiple access) and PHS Personal Handyphone System(PHS).These three kinds of patterns have different separately pluses and minuses.
GSM is the second generation mobile telephone system of developing the European end of the eighties based on numeral, has become one of the most ripe digital mobile telephone network network standard in the whole world.GSM has three working frequency range, GSM900[880-960MHz], GSM1800[1710-1880MHz] and PCS1900[1850-1990], wherein domestic main use is GSM900 and GSM1800 network.Gsm system has advantages such as the network coverage is good, and the signal penetration power is strong, but also exists radiation bigger, and level security is poor, and the availability of frequency spectrum is hanged down and reached shortcomings such as message transmission rate is low.
CDMA is a kind of wireless communication technology that grows up on spread spectrum technic, has availability of frequency spectrum height, and the call voice quality is good, and power system capacity is big, and antijamming capability is strong, good confidentiality, advantage such as radiation is lower.CDMA technology also is CDMA2000, and the basis of the technology of the third generations such as TDS-CDMA and WCDMA (3G) digital mobile communication has very large potentiality.
PHS is the abbreviation of English Personal Handy-phone System, claims Personal Handyphone System again, and as a kind of wireless local telephony, it adopts the microcellulor communication technology.The working frequency range of domestic PHS system is: 1900MHz～1920MHz.It is cheap that the PHS wireless local telephone system has telephone expenses, and data transmission capabilities is strong, and gsm system is too far behind to catch up especially for the above transmission rate of its 64K.Advantages such as PHS mobile phone transmitting power is very low, only is 10mW, and it is long also to have an air time, and the battery stand-by time is long.But with respect to other system, the PHS mobile phone is not also supported the function of roaming in other places at present.
So-called multi mode terminal just is meant that a mobile phone supports two or more communication standards or communication pattern simultaneously, thereby can make full use of the advantage of different systems and avoid its shortcoming, satisfies user's demand better.Compare with other patterns, PHS is cheap, radiation is little, but the convenient degree of unobstructed degree of the signal of other patterns and roaming in other places is better than PHS again, the multi mode terminal of as seen integrated PHS and other patterns such as GSM, CDMA, 3G has very strong complementarity, can guarantee to save communication cost for the user to greatest extent on the unimpeded basis of communication, reduce the radiation of mobile phone, thereby have very vast market prospect human body.
In multi mode terminal and since mobile phone integrated the communication unit of two or more different systems, and the circuit module of two kinds of unit and Anneta module distance are very near, its phase mutual interference can not be ignored, if do not take corresponding measure, must have a strong impact on communication quality, be difficult to reach user's expectation.
Summary of the invention
An object of the present invention is to provide a kind of multi mode terminal, it can effectively suppress the interference of PHS radiofrequency signal to non-PHS unit.
Above-mentioned purpose of the present invention realizes by following technical proposal:
A kind of multi mode terminal comprises:
A PHS unit;
At least one non-PHS unit comprises a radio-frequency (RF) receiving circuit,
Wherein, the communication system of described non-PHS standard further comprises a trapper that is connected the front end of described radio-frequency (RF) receiving circuit, and the filtering characteristic of described filter makes the signal of control channel of described PHS unit be prevented from entering described radio-frequency (RF) receiving circuit.
Preferentially, in above-mentioned multi mode terminal, described non-PHS unit is in the mobile comm unit that adopts GSM, CDMA2000, WCDMA and WiFi standard one or more.
Preferably, in above-mentioned multi mode terminal, described filter is a trapper, and its working frequency range is 1902.050Hz-1903.850Hz, and centre frequency is 1902.950Hz.Better, in above-mentioned multi mode terminal, the form of described trapper is a resonant tank.
Preferably, in above-mentioned multi mode terminal, described PHS unit comprises:
A PHS standard antenna;
A band pass filter that links to each other with described PHS standard antenna is used to suppress the radio frequency interference of described non-PHS unit;
A transmit-receive switch that links to each other with described band pass filter;
A PHS standard radio-frequency (RF) receiving circuit that links to each other with described band pass filter through described transmit-receive switch;
A PHS standard radio-frequency transmissions circuit that links to each other with described band pass filter through described transmit-receive switch; And
A PHS standard baseband processing circuitry that links to each other with PHS standard radio-frequency transmissions circuit with described PHS radio-frequency (RF) receiving circuit.
The present invention is by receiving filter that only suppresses the PHS control channel signals of series connection in the link at non-PHS, realized the purpose of design of multi-mode standby simultaneously, monotype conversation, thereby had that principle is simple, with low cost, isolation is high and be easy to plurality of advantages such as realization.
The accompanying drawing summary
Below by preferred embodiment and accompanying drawing the present invention is done to set forth more fully, wherein:
Fig. 1 is the detailed frequency spectrum profile of GSM and PHS.
Fig. 2 a and 2b are for suppressing the circuit diagram of the GSM/PHS dual-mode handset of PHS radio frequency interference function according to having of one embodiment of the present of invention, wherein Fig. 2 a is the transmission circuit schematic diagram of PHS unit, and Fig. 2 b is the transmission circuit schematic diagram of GSM unit.
Fig. 3 is the frequency response curve of a kind of trapper of adopting in the transmission circuit of GSM unit shown in Fig. 2 b.
Embodiment
In the present invention, non-PHS unit includes but not limited to adopt the mobile comm unit of GSM, CDMA2000, WCDMA and WiFi equisignal system formula.
In multi mode terminal, the PHS unit can be divided into two kinds of situations with the mutual interference mutually of other non-PHS unit.Under first kind of situation, the working frequency range of PHS unit and another non-PHS unit is far away, as GSM900 and PHS pattern, this situation can adopt the low pass filter, high pass filter, band pass filter or the band stop filter that meet insulated degree requirement to realize good restraining.Under another kind of situation, the working frequency range of PHS unit and another unit, non-PHS unit is very near, the interval of having only 20M as reception frequency range and the PHS frequency range of GSM1800, if employing this moment low pass filter, high pass filter, band pass filter or band stop filter are realized the effective inhibition to the radio frequency phase mutual interference of two pattern whole frequency, realize that then difficulty is high, cost remains high and volume is difficult for reducing.
In fact, there are following two kinds of situations in the interference that transmits to the reception link of other non-PHS unit of PHS unit:
The conversation of PHS unit, the unit standby of other patterns.
The standby of PHS unit, the unit conversation or the standby of other patterns.
For situation 1, actual influence is in PHS unit communication process, phone or other patterns that may mask other patterns of dialling in this moment can't be given the user by successful distribution service channel, and double mode when conversing simultaneously when not requiring, this interference can not produce substantial influence to the user.
For situation 2, the interference of the signal of launching during the standby of PHS unit will directly influence the call completion ratio and the speech quality of other unit, and this is intolerable for the user.
Because the signal of emission control channel only during PHS unit standby, as long as therefore can suppress the interference of PHS unit controls channel signal, just can realize the multi-mode standby and the interference-free delivery value of monotype of the communication unit of PHS unit and other patterns easily.
Air interface definition according to the PHS unit, during PHS unit standby with the base station between communicate by letter and realize by control channel fully, and fix with the control channel of other standards different is PHS, its control channel is 24～30 channels, corresponding frequency for example is 1902.050～1903.850MHz, and bandwidth is narrower, for example less than 2MHz, is far smaller than the bandwidth of whole PHS frequency range.Therefore can consider to connect the signal that a filter suppresses the PHS control channel at the radiofrequency signal receiving circuit front end of other unit, thus when solving the standby of PHS unit to the interference problem of the receiving circuit of other communication pattern unit.
In fact trapper can regard a kind of band stop filter as, because stopband very narrow (about 1 ‰ bandwidth), its inhibition degree can be done very highly, and realizes that difficulty is lower, therefore preferably, can adopt trapper to suppress the signal of PHS control channel.But filter of the present invention is not limited to trapper, and in fact it can also adopt the filter of other type, for example includes but not limited to bandpass filter, high pass filter and band pass filter.
For operation principle of the present invention better is described, below introduce a typical case of the present invention and use: the PHS unit in the GSM/PHS dual-mode handset suppresses the interference of GSM unit, and wherein the GSM unit is a two-frequency operation, comprises GSM900 and GSM1800.
The working frequency range of GSM unit is 890-960MHz (GSM900 frequency range) and 1710-1880MHz (GSM1800 frequency range), and wherein 890～915Mhz and 1710～1785MHz are transmit frequency bands, 935～960 and 1805～1880MHz for receiving frequency range.And the working frequency range of PHS unit is 1900-1920MHz, and same frequency is used in transmitting-receiving.The radio frequency interference of GSM unit and PHS unit mainly is that the radiating circuit of GSM unit is to the influence to the receiving circuit of GSM unit of the radiating circuit of the influence of the receiving circuit of PHS unit and PHS unit.
Fig. 1 is the frequency spectrum profile of GSM unit and PHS unit.As seen from the figure, the transmitting-receiving frequency range of GSM900 and the working frequency range of PHS unit have the interval of 940MHz at least, and the working frequency range of the transmit frequency band of GSM1800 and PHS unit also has the interval of 115MHz, for this situation, can be according to the frequency range choice of location in suitable filters of the series connection of radio-frequency front-end separately, be generally band pass filter, but also can be low pass filter, high pass filter or band stop filter, the signal that its objective is this pattern of the making signal of the working frequency range by making another pattern smoothly reaches desired isolation.In addition, can also find from Fig. 1, the reception frequency range of the transmit frequency band of PHS unit and GSM1800 has only the interval of 20MHz, for this situation, according to the present invention, in order to satisfy the interference-free requirement of multi-mode standby and monotype, the signal that should suppress the holding state emission of PHS unit receives the interference of link to GSM1800, as shown in Figure 1, the signal frequency of PHS control channel is 1902.050-1903.850MHz, for this reason, can adopt at filter of the receiving circuit radio-frequency front-end of GSM unit series connection and realize the control channel signals of PHS is suppressed.
Preferably, the form of filter is a trapper, and its working frequency range is 1902.050～1903.850, and centre frequency is 1902.950, so bandwidth has only about 0.1%, can easily realize with a resonant tank.
Fig. 2 a and 2b are for suppressing the circuit diagram of the GSM/PHS dual-mode handset of PHS radio frequency interference function according to having of one embodiment of the present of invention, wherein Fig. 2 a is the transmission circuit schematic diagram of PHS unit, and Fig. 2 b is the transmission circuit schematic diagram of GSM unit.
Shown in Fig. 2 a, the transmission circuit 11 of PHS unit comprises PHS antenna 111, band pass filter (BPF) 112, transmit-receive switch 113, PHS radio-frequency (RF) receiving circuit 114, PHS radio-frequency transmissions circuit 115 and PHS baseband processing circuitry 116.The effect of PHS antenna 111 is signals of radiation and emission PHS standard, and band pass filter 112 is connected between PHS antenna 111 and the transmit-receive switch 113, and the band that is used to suppress the PHS passband disturbs outward, comprises that suppressing GSM transmits to the interference of PHS unit.The switching that transmit-receive switch 113 is responsible between realization PHS radio-frequency (RF) receiving circuit 114 and the PHS radio-frequency transmissions circuit 115.PHS radio-frequency (RF) receiving circuit 114 is connected between transmit-receive switch 113 and the PHS baseband processing circuitry 116, the radiofrequency signal that PHS antenna 111 receives is through band pass filter 112 and transmit-receive switch 113 input PHS radio-frequency (RF) receiving circuit 114, is converted to by it to export PHS baseband circuit 116 to after baseband signal and handle.PHS radio-frequency (RF) receiving circuit 115 also is connected between transmit-receive switch 113 and the PHS baseband processing circuitry 116, exports transmit-receive switch 113 to after its baseband signal with 116 outputs of PHS baseband circuit is converted to radiofrequency signal, launches by PHS antenna 111 then.
Shown in Fig. 2 b, the transmission circuit 12 of GSM unit comprises GSM antenna 121, trapper 122, duplexer 123, GSM radio-frequency (RF) receiving circuit 124, GSM radio-frequency transmissions circuit 125 and GSM baseband processing circuitry 126.The effect of GSM antenna 121 is signals of radiation and emission GSM standard.The switching that duplexer 123 is responsible between realization GSM radio-frequency (RF) receiving circuit 124 and the GSM radio-frequency transmissions circuit 125.GSM radio-frequency (RF) receiving circuit 125 is connected between duplexer 123 and the GSM baseband processing circuitry 126, exports duplexer 123 to after its baseband signal with 126 outputs of GSM baseband circuit is converted to radiofrequency signal, launches by GSM antenna 121 then.Trapper 122 and GSM radio-frequency (RF) receiving circuit 124 are connected between duplexer 123 and the GSM baseband processing circuitry 126 successively, the radiofrequency signal that GSM antenna 121 receives is through duplexer 123 input trappers 122, the effect of trapper 122 is to stop the PHS control channel signals that comprises in the radiofrequency signal to be passed through, and promptly suppresses the component of the PHS control channel signals in the radiofrequency signal.GSM radio-frequency (RF) receiving circuit 124 will be converted to baseband signal through the radiofrequency signal after trapper 122 Filtering Processing, and export GSM baseband circuit 126 to and handle.
Fig. 3 has provided the frequency response chart of used trapper among Fig. 2 b, and in the drawings, the S of ordinate (2,1) is the forward transmitted coefficient, and it is defined as the gain of output port to input port, and abscissa is a frequency.As shown in the figure, wherein, the working frequency range of trapper is 1902.050～1903.850, and centre frequency is 1902.950, suppresses in the band more than the Du Keda 50dB, and therefore attenuation outside a channel meets the insulated degree requirement of PHS unit and GSM unit fully less than 0.5dB.
Embodiment circuit shown in top Fig. 2 a and the 2b is simple, and principle is clear, and effect is obvious, has solved the problem of radiofrequency signal phase mutual interference in the PHS/GSM dual-mode handset, has especially solved PHS and has transmitted to the difficult point of GSM1800 band interference.In addition, adopt the gsm communication pattern as another pattern in the present embodiment, but it extend to other communication pattern equally, for example communication patterns such as CDMA2000, WCDMA and WiFi.
After reading above-mentioned disclosure content, other modification it will be apparent to one skilled in the art that to be conspicuous.This modification may relate in wireless communication system and the component unit thereof well-known features, and these features can replace the feature described here or use in the mode of adding.
In this specification and claims, appear at before the unit word " " not the situation with a plurality of this unit foreclose.And word " comprises " situation that not eliminating also has other unit or step to exist except that institute's column unit or step.
Claims (5)
1, a kind of multi mode terminal comprises:
A PHS unit;
At least one non-PHS unit comprises a radio-frequency (RF) receiving circuit,
It is characterized in that, the communication system of described non-PHS standard further comprises a filter that is connected the front end of described radio-frequency (RF) receiving circuit, and the filtering characteristic of described filter makes the signal of control channel of described PHS unit be prevented from entering described radio-frequency (RF) receiving circuit.
2, multi mode terminal as claimed in claim 1, wherein, described non-PHS unit is in the mobile comm unit that adopts GSM, CDMA2000, WCDMA and WiFi standard one or more.
3, multi mode terminal as claimed in claim 2, wherein, described filter is a trapper, and its working frequency range is 1902.050Hz-1903.850Hz, and centre frequency is 1902.950Hz.
4, multi mode terminal as claimed in claim 3, wherein, the form of described trapper is a resonant tank.
5, multi mode terminal as claimed in claim 1, wherein, described PHS unit comprises:
A PHS standard antenna;
A band pass filter that links to each other with described PHS standard antenna is used to suppress the radio frequency interference of described non-PHS unit;
A transmit-receive switch that links to each other with described band pass filter;
A PHS standard radio-frequency (RF) receiving circuit that links to each other with described band pass filter through described transmit-receive switch;
A PHS standard radio-frequency transmissions circuit that links to each other with described band pass filter through described transmit-receive switch; And
A PHS standard baseband processing circuitry that links to each other with PHS standard radio-frequency transmissions circuit with described PHS radio-frequency (RF) receiving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610106873 CN1889400A (en) | 2006-08-07 | 2006-08-07 | Multi-mode cell phone capable of suppressing PHS mode radio frequency interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610106873 CN1889400A (en) | 2006-08-07 | 2006-08-07 | Multi-mode cell phone capable of suppressing PHS mode radio frequency interference |
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| CN1889400A true CN1889400A (en) | 2007-01-03 |
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| CN 200610106873 Pending CN1889400A (en) | 2006-08-07 | 2006-08-07 | Multi-mode cell phone capable of suppressing PHS mode radio frequency interference |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895329A (en) * | 2009-04-29 | 2010-11-24 | 奎兰股份有限公司 | Duplexer and switch strengthen |
| CN101222691B (en) * | 2007-01-08 | 2011-03-02 | 中兴通讯股份有限公司 | Restraining method and circuit for double-module mobile phone channel selective disturbance |
| CN101035387B (en) * | 2007-04-06 | 2011-12-28 | 中兴通讯股份有限公司 | Testing method of multi-access terminal channel restraint |
| CN106788309A (en) * | 2015-11-20 | 2017-05-31 | 厦门宇臻集成电路科技有限公司 | Power amplifier with WIFI trappers |
| CN109768810A (en) * | 2019-03-07 | 2019-05-17 | 维沃移动通信有限公司 | A kind of signal processing circuit, terminal device and signal processing method |
-
2006
- 2006-08-07 CN CN 200610106873 patent/CN1889400A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101222691B (en) * | 2007-01-08 | 2011-03-02 | 中兴通讯股份有限公司 | Restraining method and circuit for double-module mobile phone channel selective disturbance |
| CN101035387B (en) * | 2007-04-06 | 2011-12-28 | 中兴通讯股份有限公司 | Testing method of multi-access terminal channel restraint |
| CN101895329A (en) * | 2009-04-29 | 2010-11-24 | 奎兰股份有限公司 | Duplexer and switch strengthen |
| CN106788309A (en) * | 2015-11-20 | 2017-05-31 | 厦门宇臻集成电路科技有限公司 | Power amplifier with WIFI trappers |
| CN109768810A (en) * | 2019-03-07 | 2019-05-17 | 维沃移动通信有限公司 | A kind of signal processing circuit, terminal device and signal processing method |
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Open date: 20070103 |