CN101577924B - Method for testing coupling sensitivity of PHS mobile phone - Google Patents
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- CN101577924B CN101577924B CN200910047081.XA CN200910047081A CN101577924B CN 101577924 B CN101577924 B CN 101577924B CN 200910047081 A CN200910047081 A CN 200910047081A CN 101577924 B CN101577924 B CN 101577924B
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Abstract
The invention relates to a method for testing the coupling sensitivity of a PHS mobile phone. The method is to indirectly calculate the coupling sensitivity by measuring the conductive sensitivity, the conductive drop-call level and the coupling drop-call level of the PHS mobile phone, namely Coupling Sensitivity=Conductive Sensitivity-Conductive Drop-call Level+Coupling Drop-call Level.
Description
Technical field
The present invention relates to a kind of method of testing of mobile phone coupling sensitivity, particularly a kind of method of testing of PHS mobile phone coupling sensitivity.
Background technology
In recent years along with the development of mobile communication technology, the integrated function of mobile phone gets more and more, high-end PHS mobile phone generally all can configure MP3 at present, camera, touch-screen, T card, have even also with bluetooth, the functional modules such as broadcast receiver, the electromagnetic compatibility problem of bringing thus also becomes increasingly complex, complete machine radio-frequency performance to mobile phone has been brought new challenge, particularly mobile phone complete-machine coupling sensitivity, the conducted susceptibility of general mainboard does not well represent that the coupling sensitivity of complete machine is all right, coupling sensitivity is except outside the Pass having with antenna, also relevant with the interference signal of mobile phone self.Therefore must be able to carry out quantitative test analysis to the coupling sensitivity of mobile phone, to understand truly the receptivity of mobile phone in reality call more comprehensively.
GSM mobile handset and CDMA mobile phone are all supported back bad test pattern, under this test pattern, the downlink data that comprehensive test instrument is issued mobile phone can return to comprehensive test instrument by air interface again after by mobile phone reception & disposal in the upstream data of mobile phone, and comprehensive test instrument just can be judged the reception error rate of mobile phone accordingly.So GSM mobile handset and CDMA mobile phone test coupling sensitivity are relatively simple, as long as mobile phone is placed in microwave dark room or TEM cell (TransverseElectromagnetic Transmission Cell transverse electro-magnetic wave transmission cell), sets up calling by the comprehensive test instrument of spatial coupling and outside and just can measure coupling sensitivity.
Yet PHS mobile phone is not supported loopback test pattern, when test receiving sensitivity, generally by PC, to control PHS mobile phone to enter accepting state, PHS mobile phone will return to comprehensive test instrument by DATA and two holding wires of CLOCK after the data processing receiving again, and comprehensive test instrument is judged the reception error rate of PHS mobile phone accordingly.This test mode is only suitable for for testing conducted susceptibility, if be used for testing coupling sensitivity, on the one hand because needs are drawn DATA and two holding wires of CLOCK to microwave dark room or TEM cell outside from cell phone mainboard, can affect the performance of antenna like this, even introduce and disturb, cause measurement inaccurate.On the other hand due to this test mode, the state of mobile phone in receive always, is different from actual talking state, therefore can not truly reflect the receptivity in the actual call of mobile phone, if self there is interference signal in the actual communication process of mobile phone, this method of testing often can't find.Therefore, the passive indexs such as the gain, efficiency, directional diagram of PHS antenna for mobile phone are generally only measured by current antenna producer, and coupling firing power, but cannot provide the coupling sensitivity of PHS mobile phone.Yet in R&D process, we tend to find that the passive performance of certain its antenna of PHS mobile phone is fine, but this mobile phone often occurs that under weak signal call completion ratio is low, call is interrupted, even the situation of call drop.This situation is all generally because mobile phone self exists interference signal, has affected coupling sensitivity, causes complete machine receptivity obviously to decline.Therefore the coupling sensitivity of Measurement accuracy PHS mobile phone is necessary.
Summary of the invention
For overcoming the deficiency of above-mentioned prior art, the technical problem to be solved in the present invention is to provide a kind of method of testing of PHS mobile phone coupling sensitivity.The inventive method is between the conducted susceptibility of PHS mobile phone, conduction call drop level, coupling call drop level, coupling sensitivity, to set up corresponding relation, with this, to calculate the coupling sensitivity of PHS mobile phone.
For solving the problems of the technologies described above, the inventive method comprises the steps:
1) test and record the conducted susceptibility of tested PHS mobile phone;
2) test and record the conduction call drop level of tested PHS mobile phone;
3) test and record the coupling call drop level of tested PHS mobile phone;
4) calculate coupling sensitivity=conducted susceptibility-conduction call drop level+coupling call drop level of tested PHS mobile phone.
The inventive method is that conducted susceptibility, conduction call drop level and the coupling call drop level by measuring PHS mobile phone carrys out indirect calculation coupling sensitivity.Correlation between these 4 parameters is: coupling sensitivity-coupling call drop level=conducted susceptibility-conduction call drop level.
Compared with prior art, the inventive method can be carried out quantitative test analysis to PHS mobile phone coupling sensitivity, thereby not only can be used for measuring the receptivity of PHS antenna for mobile phone, can also help Radio Frequency Engineer to locate fast, solve the poor problem of coupling sensitivity causing due to PHS mobile phone self interference signal.
Accompanying drawing explanation
Fig. 1 is PHS mobile phone conducted susceptibility testing equipment connection diagram;
Fig. 2 is PHS mobile phone coupling performance testing equipment connection diagram;
Fig. 3 is that PHS mobile phone receives the schematic diagram that the error rate changes with received signal power level value;
Fig. 4 is the schematic diagram of the inventive method
Fig. 5 is the flow chart of the inventive method.
Embodiment
Below in conjunction with drawings and Examples, specific embodiments of the present invention are further described in detail, but should not limit the scope of the invention with this.
The inventive method is between the conducted susceptibility CS of PHS mobile phone, conduction call drop level CL, coupling call drop level RL and coupling sensitivity RS, to set up corresponding relation, with this, to calculate the coupling sensitivity RS of PHS mobile phone.
The receiving sensitivity of PHS mobile phone is defined as: along with being input to the radiofrequency signal power level value of tested mobile phone, reduce gradually, the reception error rate (BER) of mobile phone can increase gradually, input signal power level value when the error rate rises to 1% is exactly the receiving sensitivity of this mobile phone, index request receiving sensitivity≤16dBuV.
Fig. 1 is PHS mobile phone conducted susceptibility CS testing equipment connection diagram.The conducted susceptibility CS of PHS mobile phone is exactly the receiving sensitivity recording in the situation that RF cable connects.Because PHS does not support loopback test pattern, so be generally to control tested PHS mobile phone by PC to enter accepting state during test receiving sensitivity, the output radiofrequency signal of comprehensive test instrument MT8801C is input to tested mobile phone by RF cable, tested mobile phone is after down-conversion, demodulation etc. are processed, again the information exchange receiving is crossed to two holding wires of DATA and CLOCK and returned to comprehensive test instrument MT8801C, comprehensive test instrument MT8801C, by comparing the difference between the information of being returned by mobile phone and the initial information of oneself issuing mobile phone, just can calculate the reception error rate of mobile phone.In the test of PHS mobile phone receiving sensitivity, these two holding wires of DATA and CLOCK are absolutely necessary.
PHS mobile phone, in communication process, will produce error code after the radiofrequency signal power level value receiving is reduced to certain value, and along with the radiofrequency signal power level value receiving further reduces, error code further increases, and finally causes call drop.Received RF signal power level value is now called call drop level.Comprehensive test instrument MT8801C can simulate a PHS base station and PHS mobile phone is set up call.Between comprehensive test instrument MT8801C and PHS mobile phone, can set up call by RF cable, the call drop level recording is in this manner called conduction call drop level CL; Between comprehensive test instrument MT8801C and PHS mobile phone, also can set up call by the mode of Space Coupling, the call drop level recording is in this manner called coupling call drop level RL.
Fig. 2 is PHS mobile phone coupling performance testing equipment connection diagram.TEM cell in Fig. 2 is a kind of transverse electro-magnetic wave transmission cell, and comprehensive test instrument MT8801C is connected by RF cable with TEM cell, and the tested mobile phone and the TEM cell that are placed in TEM cell adopt spatial coupling, and final and comprehensive test instrument MT8801C establishes call connection.TEM cell can be avoided the interference of outer signals to measuring-signal.Use TEM cell to measure complete-machine coupling performance, relatively approach the state of actual call, certainly do not consider the situation of human body sensing here.In addition, TEM cell also can replace with microwave dark room or plate aerial, but microwave dark room cost is more expensive, and plate aerial measurement accuracy is not high.
Testing equipment shown in Fig. 2 can be used for testing coupling call drop level RL and the coupling firing index of PHS mobile phone, but but can not directly test coupling sensitivity RS, because PHS does not support loopback test pattern, in the test of receiving sensitivity, the information that must have two holding wires of DATA and CLOCK that mobile phone is received returns to comprehensive test instrument, and not so comprehensive test instrument cannot accurately be learnt the reception error rate D% of mobile phone.If in the such mode of test conducted susceptibility CS, and test coupling sensitivity RS with the equipment shown in Fig. 2, on the one hand because needs are drawn DATA and two holding wires of CLOCK to TEM cell outside from cell phone mainboard, can affect the performance of antenna like this, even introduce and disturb, cause measurement inaccurate.On the other hand due to this test mode, the state of mobile phone in receive always, is different from actual talking state, therefore can not truly reflect the receptivity in the actual call of mobile phone, if self there is interference signal in the actual communication process of mobile phone, this method of testing often can't find.
Fig. 3 is that PHS mobile phone receives the schematic diagram that error rate D% changes with received signal power level value, and its variation relation meets certain natural Exponents curve.For the same PHS of portion mobile phone, this variation relation is certain, the result difference of repeatedly measuring is little, and no matter be conduction test or coupling measurement, the same PHS of portion mobile phone all meets same variation relation, be that the error rate that conducted susceptibility CS and coupling sensitivity RS are corresponding is all 1%, conduction call drop level CL and the error rate corresponding to coupling call drop level RL are all definite values, are denoted as D%.This variation relation that do not need to know for sure for method of the present invention is to meet which kind of natural Exponents relation, do not need to know that the error rate D% that call drop level is corresponding is specifically how many, only need to know that the correlation between conducted susceptibility CS, conduction call drop level CL, coupling call drop level RL, these 4 parameters of coupling sensitivity RS is just passable yet.
Fig. 4 is the schematic diagram of the inventive method, i.e. correlation schematic diagram between conducted susceptibility CS, conduction call drop level CL, coupling call drop level RL and these 4 parameters of coupling sensitivity RS.When (a) part in Fig. 4 is conduction test, PHS mobile phone receives the schematic diagram that the error rate changes with comprehensive test instrument output signal strength, when (b) part in figure is coupling measurement, PHS mobile phone receives the schematic diagram that the error rate changes with comprehensive test instrument output signal strength, has considered test macro line loss separately here.For the same PHS of portion mobile phone, (a) curve of part and (b) curve of part, its Changing Pattern is the same, ordinate is also the same, be that the error rate that conducted susceptibility CS and coupling sensitivity RS are corresponding is all 1%, conduction call drop level CL and the error rate corresponding to coupling call drop level RL are all D%.(a) part and (b) the unique difference of part be that abscissa is different, in other words (a) part curve and (b) part curve after abscissa translation, can overlap completely.Do not having in noisy situation, the amount of this translation is exactly the gain size of antenna, and the direction of translation is positive and negative relevant with antenna gain, if antenna gain is 0dB, two curves overlap completely so, and coupling sensitivity RS just equals conducted susceptibility CS.In noisy situation, the amount of this translation is relevant with the degree of the gain of antenna and interference.According to curve of (a) part and (b) curve of part along this feature that can overlap completely after abscissa translation, can draw the basic principle of the inventive method, this basic principle can represent with following equation:
Coupling sensitivity RS-coupling call drop level RL=conducted susceptibility CS-conduction call drop level CL can derive from above-mentioned equation:
Coupling sensitivity RS=conducted susceptibility CS-conduction call drop level CL+ coupling call drop level RL as can be seen from the above equation, as long as measure conducted susceptibility CS, conduction call drop level CL and these 3 parameters of coupling call drop level RL, just can calculate coupling sensitivity RS=CS-CL+RL.
Fig. 5 is the flow chart of the inventive method, and the testing process of PHS mobile phone coupling sensitivity comprises the steps:
1) according to Fig. 1 connecting test equipment, PC controls tested PHS mobile phone and enters accepting state, comprehensive test instrument MT8801C is switched to receiving sensitivity test interface, progressively reduce the output signal strength of comprehensive test instrument MT8801C, observation receives the variation of the error rate, until the error rate rises to 1%, record the now output signal strength value of comprehensive test instrument MT8801C, be the conducted susceptibility CS of this tested PHS mobile phone.By identical method, can test the conducted susceptibility CS of a plurality of channels.
2) comprehensive test instrument MT8801C is switched to call testing interface, tested PHS mobile phone is set up and is called out by RF cable and comprehensive test instrument MT8801C, progressively reduce the output signal strength of comprehensive test instrument MT8801C, until tested mobile phone call drop, record the now output signal strength value of comprehensive test instrument MT8801C, be the conduction call drop level CL of this tested PHS mobile phone.By identical method, can test the conduction call drop level CL of a plurality of channels.
3) according to Fig. 2 connecting test equipment, comprehensive test instrument MT8801C is switched to call testing interface, tested PHS mobile phone is placed in TEM cell, set up and call out with comprehensive test instrument MT8801C, progressively reduce the output signal strength of comprehensive test instrument T8801C, until tested mobile phone call drop records the now output signal strength value of comprehensive test instrument MT8801C, be the coupling call drop level RL of this tested PHS mobile phone.By identical method, can test the coupling call drop level RL of a plurality of channels.
4) calculate the coupling sensitivity RS=CS-CL+RL of tested PHS mobile phone.
Give an example, according to the method described above 39 channels of a PHS mobile phone are tested, record its conducted susceptibility CS=7.0dBuV, conduction call drop level CL=6.5dBuV, coupling call drop level RL=8.0dBuV, so its coupling sensitivity RS=CS-CL+RL=7.0-6.5+8.0=8.5dBuV.
The foregoing is only preferred embodiment of the present invention, be not used for limiting practical range of the present invention.Be that all equivalences of doing according to the content of the present patent application the scope of the claims change and modify, all should be technology category of the present invention.
Claims (3)
1. a method of testing for PHS mobile phone coupling sensitivity, comprises the steps:
(a) test out the conducted susceptibility of tested PHS mobile phone, its concrete test process comprises:
(a1) tested PHS mobile phone is connected on computer and comprehensive test instrument, comprehensive test instrument is switched to receiving sensitivity test interface, by the tested PHS mobile phone of computer control, enter accepting state, the output radiofrequency signal of comprehensive test instrument is input to tested PHS mobile phone by a RF cable;
(a2) tested PHS mobile phone is after a series of processing, again the information exchange receiving is crossed to DATA and two holding wires of CLOCK of being connected with comprehensive test instrument and returned to comprehensive test instrument, difference between the initial information of issuing tested PHS mobile phone by the information relatively returned by tested PHS mobile phone and comprehensive test instrument self, calculates the reception error rate of tested PHS mobile phone;
(a3) progressively reduce the output signal strength of comprehensive test instrument, observation receives the variation of the error rate, until receive the error rate, rises to 1%, records the now output signal strength value of comprehensive test instrument, and this output signal strength value is the conducted susceptibility of this tested PHS mobile phone;
(b) test out the conduction call drop level of tested PHS mobile phone, it specifically comprises the following steps:
(b1) tested PHS mobile phone is connected on computer and comprehensive test instrument, comprehensive test instrument is switched to receiving sensitivity test interface, by the tested PHS mobile phone of computer control, enter accepting state, the output radiofrequency signal of comprehensive test instrument is input to tested PHS mobile phone by a RF cable;
(b2) tested PHS mobile phone is after a series of processing, again the information exchange receiving is crossed to DATA and two holding wires of CLOCK of being connected with comprehensive test instrument and returned to comprehensive test instrument, difference between the initial information of issuing tested PHS mobile phone by the information relatively returned by tested PHS mobile phone and comprehensive test instrument self, calculates the reception error rate of tested PHS mobile phone;
(b3) progressively reduce the output signal strength of comprehensive test instrument, until tested PHS mobile phone call drop records the now output signal strength value of comprehensive test instrument, this output signal strength value is the conduction call drop level of this tested PHS mobile phone;
(c) test out the coupling call drop level of tested PHS mobile phone, its concrete test process comprises:
(c1) comprehensive test instrument is switched to call testing interface;
(c2) tested PHS mobile phone is placed in a TEM cell (Transverse Electromagnet ic Transmi ssion Cell), comprehensive test instrument is connected by a RF cable with this TEM cell, be placed on tested PHS mobile phone in TEM cell and TEM cell and adopt spatial coupling, and final and comprehensive test instrument establishes call connection;
(c3) progressively reduce the output signal strength of comprehensive test instrument, until tested PHS mobile phone call drop records the now output signal strength value of comprehensive test instrument, this output signal strength value is the coupling call drop level of this tested PHS mobile phone;
(d) calculate coupling sensitivity=conducted susceptibility-conduction call drop level+coupling call drop level of tested PHS mobile phone.
2. method according to claim 1, is characterized in that, described TEM cell replaces with microwave dark room.
3. method according to claim 1, is characterized in that, described TEM cell replaces with plate aerial.
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| CN108599877B (en) * | 2018-04-13 | 2021-04-06 | 上海剑桥科技股份有限公司 | Total omnidirectional sensitivity performance evaluation method |
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| WO2006047677A1 (en) * | 2004-10-25 | 2006-05-04 | Qualcomm Incorporated | Systems, methods and apparatus for determining a radiated performance of a wireless device |
| EP1830493A1 (en) * | 2006-03-01 | 2007-09-05 | Research In Motion Limited | System and method for determining receiver sensitivity |
| CN101212745A (en) * | 2006-12-29 | 2008-07-02 | 中兴通讯股份有限公司 | Method for mutual interference performance test of dual-mode dual-standby mobile terminal |
| CN101237285A (en) * | 2007-12-09 | 2008-08-06 | 青岛海信移动通信技术股份有限公司 | A method for testing wireless interference of GSM dual-mode and dual-idle |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006047677A1 (en) * | 2004-10-25 | 2006-05-04 | Qualcomm Incorporated | Systems, methods and apparatus for determining a radiated performance of a wireless device |
| EP1830493A1 (en) * | 2006-03-01 | 2007-09-05 | Research In Motion Limited | System and method for determining receiver sensitivity |
| CN101212745A (en) * | 2006-12-29 | 2008-07-02 | 中兴通讯股份有限公司 | Method for mutual interference performance test of dual-mode dual-standby mobile terminal |
| CN101237285A (en) * | 2007-12-09 | 2008-08-06 | 青岛海信移动通信技术股份有限公司 | A method for testing wireless interference of GSM dual-mode and dual-idle |
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