CN1870473A - Passive intermodulation testing method of mobile communication base station system - Google Patents
Passive intermodulation testing method of mobile communication base station system Download PDFInfo
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- CN1870473A CN1870473A CNA2005100310579A CN200510031057A CN1870473A CN 1870473 A CN1870473 A CN 1870473A CN A2005100310579 A CNA2005100310579 A CN A2005100310579A CN 200510031057 A CN200510031057 A CN 200510031057A CN 1870473 A CN1870473 A CN 1870473A
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Abstract
This invention relates to test to the passive intermodulation performance of the communication system, which controls an emitter to emit test signals according to a preset mode, controls a receiver to scan and receive the signals in the test bands and analyze spectrums of the received signals to evaluate the entire passive intermodulation performance of the base station, in which, the original outside interference signals are received at the shut-off state of the emitter to eliminate its influence and measure the performance accurately and the received test bands are computed accurately by the known carrier frequency sphere, intermodulation stages and the received frequency sphere parameters and the test signal receiving quality is increased by scanning the emitted and received continuous waves.
Description
Technical field
The present invention relates to the communication system passive intermodulation testing, particularly the passive intermodulation testing of mobile communication base station system.
Background technology
In radio communication, various system noises and external interference are of great impact for wireless signal and communication quality.Therefore in wireless communication system design and installation process, need all that performance is carried out test evaluation to system is anti-interference etc., even in the operation maintenance process, all to often test, factors such as, environmental impact aging with decision means are to the system performance degradation degree, thereby take corresponding measure to safeguard, to reach the purpose that keeps the wireless communication system services quality.As seen normal operation is very important to system performance evaluation to communication system with monitoring, and passive intermodulation is exactly an a kind of typical wireless system performance index wherein.
So-called passive intermodulation (Passive Inter-Modulation is called for short " PIM ") with regard to the carrier signal that is meant a plurality of different frequencies of system by the mixing effect of system's passive device phase inter-modulation cause to the extra interference of system.In Modern Communication System, when the carrier signal of a plurality of frequencies is passed through some passive devices, all can produce intermodulation distortion.For cell mobile communication systems, passive device comprises that duplexer, feeder, tower are put, lightning arrester, antenna etc., owing to its mechanical connection unreliable, use and to have the material of hysteresis characteristic, stained reasons such as contact-making surface, the signal of different frequency produces the passive intermodulation product of different amplitudes at material junction non-linear frequency mixing.And if these intermodulation distortion signals are fallen in the frequency acceptance band, the signal to noise ratio of received signal is descended, have a strong impact on capability of communication system and quality.
The intermodulation distortion of two frequencies is the most basic and ubiquitous problems in the Modern Communication System.Such as the wireless transceiver system that has two carrier frequency for, can produce multistage intermodulation distortion after its carrier wave intermodulation.Passing through a passive device when the CF signal of two (or more), because aforementioned various non-linear factors make it produce mixer action to signal, similarly is a mixer diode.If these two carrier frequency are F1 and F2, it is 2F1 and 2F2 that its modulation may produce second harmonic, these frequencies the maximum intermodulation product that further produces be exactly third order intermodulation distortion, be 2F1-F2 and 2F2-F1.The typical index of third-order intermodulation product (3rd-order Intermodulation is called for short " IM3 ") is-153dBc.So-called IM3 is exactly that CF signal as two+43dBm is added to measured device when (DeviceUnder Test is called for short " DUT ") simultaneously for the meaning of-153dBc, and the IM3 value of its generation is not more than+43-153=-110dBm.
As seen the intermodulation distortion meeting reduces the performance of communication system, excessive intermodulation product can disturb other receiver in transmitting, in the time of particularly within intermodulation product just in time drops on the receiver frequency range, will cause that receiver performance is serious to descend even can't operate as normal.In the past, wireless system designer comparatively was concerned about the intermodulation testing of active device.Along with the development of communication system and the raising of mass of system, the measurement of the passive intermodulation of device has also more and more been paid attention to.
But testing the performance that can not guarantee whole system for independent each device can touch the mark, particularly behind system's operation certain hour, can't monitor system, so that better maintaining is a current urgency problem to be solved if therefore system is carried out whole passive intermodulation testing evaluation.
Especially for mobile communication base station system, its design and installation and work safeguard that each stage is comparatively independent.The performance of each parts of system reaches certain standard through test before installing, but after installation in the particularly operation maintenance process, the passive intermodulation performance of its system often can not get effective test, brings certain hidden danger for the steady operation of system.Particularly system works is after a period of time, and each parts of system are constantly aging, and the passive intermodulation performance of base station system may further worsen, and makes the wireless performance of base station system descend, and influences the good operation of system.
At present, for the passive intermodulation testing of mobile communication base station system, only limitation with to the independent test of each passive component, the intermodulation performance during not to each unit construction work of whole base station system is tested.The passive intermodulation testing of parts is normally put, carries out before each comfortable installation of parts such as lightning arrester, antenna to existing solution to duplexer, feeder, tower that base station system used, guarantee to satisfy the index of design.Each component-assembled is formed whole base station system promptly can't test it afterwards.Yet be all can't obtain monitoring and maintenance, have a strong impact on base station operate as normal and maintenance because the passive intermodulation performance that problems such as installation environment or part aging cause reduces.
In actual applications, there is following problem in such scheme: each parts of base station by after the passive intermodulation testing, can not guarantee that whole base station system can satisfy the PIM index separately after installing.
In fact, because various factors in component-assembled and the coordination process still can cause the base station passive intermodulation performance to reduce.Such as, installation is bad in the installation process causes that connection is bad between the parts, and new intermodulation factor is introduced in equivalence; Electromagnetic compatibility problem between the perhaps different parts; Or base station carrier, reception frequency range are provided with the change of situation, cause the variation of PIM coverage; Perhaps the difference of external environment condition causes the further deterioration of component capabilities; More common then is, because after base station system work a period of time, reasons such as part aging, connection loosing all can make the passive intermodulation decreased performance.
More than all situations, all can not by install forepiece separately test guarantee, also can not solve by the method that the dismounting parts are tested separately.Can only be by base station system integral body be carried out the passive intermodulation Performance Detection, the performance change of monitoring base station system in regular maintenance, this is the insurmountable technical problem of prior art.
Cause the main cause of this situation to be, the prior art scheme only is confined to each parts are tested separately, can't carry out integrated testability to whole base station system.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of passive intermodulation testing method of mobile communication base station system, makes base station system can carry out whole passive intermodulation testing, and accurate base station system performance evaluation index is provided.
For achieving the above object, the invention provides a kind of passive intermodulation testing method of mobile communication base station system, comprise following steps
The transmitter of A base station system to be measured is pressed the preset mode emissioning testing signal;
The receiver of the described base station system of B scans reception by preset mode in the test frequency range;
C according to received signal spectrum analysis estimate the passive intermodulation performance of described base station system.
Wherein, described steps A, B comprise following substep
The described Transmitter Turn-Off emission of A1;
The described receiver of B1 receives original external interference signal in the interscan of described test frequency range;
The described transmitter of A2 is launched at least a test signal successively;
The described receiver of B2 receives the received signal of corresponding described test signal successively in the interscan of described test frequency range.
In this external described method, described step C comprises following substep
Remove described original external interference signal in the received signal of the corresponding at least a described test signal that the described receiver of C1 receives successively and obtain pure test received signal;
C2 contrasts the frequency spectrum of the described test signal of its correspondence according to the spectrum analysis of described pure test received signal, the passive intermodulation performance of the described base station system of overall merit.
In this external described method, the scope of the described test frequency range among the described step B is calculated by following criterion:
According to the carrier number to be tested of described base station system, determine the exponent number of its passive intermodulation to be tested earlier;
According to the transmit frequency band scope of described passive intermodulation exponent number and described carrier wave, determine the band limits of described passive intermodulation again;
Calculate the common factor of the reception band limits of the band limits of described passive intermodulation and described base station system at last, promptly obtain the scope of described test frequency range.
In this external described method, in the described steps A 2, described test signal is a continuous wave, and described transmitter is launched swept-frequency signal on a carrier wave therein, launches fixed frequency signal on other carrier waves; Traveled through after current fixed frequency transmits, fixed frequency is transmitted to be changed on another carrier frequency, and once more to one of them carrier transmit swept-frequency signal, so circulation is until two all combination of frequencies that transmit; Above-mentioned emission signal frequency array sweeping can be deleted combination of frequency according to concrete condition, to reduce the testing time;
Among the described step B2, described receiver carries out synchronous scanning and receives in the intermodulation frequency range to be measured of described test signal correspondence.
In this external described method, in the described steps A, described transmitter emission is controlled in the order that described base station system issues according to test console;
Among the described step B, described base station system is uploaded to described test console with the described received signal of described receiver;
Among the described step C, described test console is finished the evaluation to the analysis of described received signal and described passive intermodulation performance.
In this external described method, described test console is directly controlled described base station system by the near-end control interface, perhaps controls described base station system by base station controller interface and mobile communications network at far-end and tests.
In this external described method, described test console passes through directly installation testing software on described base station system, perhaps loads described testing software by far-end, to realize the control to described base station system.
By relatively finding, the main distinction of technical scheme of the present invention and prior art is, by controlling transmitter by the preset mode emissioning testing signal, receiver control receives in the interscan of test frequency range simultaneously, and carries out the passive intermodulation performance that base station system integral body is estimated in spectrum analysis to received signal;
By receiving original external interference signal closing under the situation of transmitter, to remove external influence, the passive intermodulation product of accurate measuring systems itself;
The test frequency range of coming accurate Calculation to receive by parameters such as known carrier frequency scope, intermodulation exponent number and receive frequency ranges, and the mode that adopts scanning to transmit and receive continuous wave improves the test signal quality of reception;
By test console the control of base station system and spectrum intensity to received signal etc. analyses are realized the efficient test of base station system and accurately evaluation;
Realize the test control of dual mode by the visit of near-end control interface and far-end network, the scheme of direct installation and long-range loading testing software is provided respectively, the personnel of maintaining easily test.
Difference on this technical scheme, brought comparatively significantly beneficial effect, promptly based on base station system integrated testability scheme of the present invention, can be to installing or base station system after a period of time of working is carried out whole passive intermodulation testing, need not outside tester, do not need to dismantle parts and test separately, be very easy to the monitoring and the maintenance work of base station system;
Owing to earlier original external interference is received and removes before the test, improved own Intermodulation Interference test accuracy greatly to system, improve the confidence level of system performance evaluation, the location and the performance detection of system's passive intermodulation problem also there is very big effect;
In addition, the accurate estimation of being carried out the Intermodulation Interference frequency range by system parameters makes that also test specification is clearer and more definite, and testing efficiency improves greatly, and the scanning of same employing continuous wave transmits and receives, also make the test signal signal to noise ratio improve, can the potential Intermodulation Interference factor of full test system;
At last, by providing of near-end control interface, inner installation testing software or far-end control, loading two kinds of schemes of testing software, the staff can the remote control network various places base station testing, simplified test maintaining personnel's work greatly, be very easy to opening base station, periodic maintenance and troubleshooting etc., complicated testing software can be loaded into the base station by far-end and implement, analytic function is strengthened greatly, avoid the transformation of system hardware, also saved the human and material resources cost of network operation simultaneously.
Description of drawings
Fig. 1 is that mobile communication base station system is formed schematic diagram;
Fig. 2 is a base station system passive intermodulation testing flow chart according to the embodiment of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Basic principle of the present invention is to launch predetermined test signal in predetermined patterns by the transmitter of software control design base station, simultaneously receiver control is in the test frequency range inter-sync scanning received signal of estimating, thus can be from the comparative analysis of both frequency spectrums the performance index of evaluation system Intermodulation Interference.On these basic ideas, also have some additional ins and outs can further improve precision, efficient, the reduction test of test cost, make things convenient for test operation etc.These class ins and outs are such as having: by receive the influence that original external interference removes external interference earlier when closing transmitter; Pre-estimate Intermodulation Interference place frequency range by receive frequency range etc. by carrier frequency, and receiver control receives in this frequency range, improve testing efficiency; Realize the control of test console by base station near-end control interface or far-end network to the base station, realize upgrading of base station system test function or the like by direct installation and long-range loading testing software, these technology have all made things convenient for the carrying out of test job, have reduced testing cost.
Be that example is further described ins and outs of the present invention with typical base station system below.Fig. 1 is exactly the base station transceiver system schematic diagram of typical two carrier frequencies.Provided each parts and the order of connection thereof of base station system among the figure from the control side to the air interface oral-lateral.
In the base stations control side two interfaces are arranged generally.The control interface of one of them near-end can be controlled the base station by computer at the base station near-end.An interface that links to each other with base station controller is arranged simultaneously, link to each other with base station controller, link to each other with the Operation ﹠ Maintenance System of wireless system by this interface simultaneously, make and on any one node of wireless system, to carry out Long-distance Control the base station by this interface.Each cell base station of whole cellular mobile communication networks is connected in the network by base station controller exactly, and realize between each base station exchanging visit with communicate by letter.The present invention just utilizes the access control of the dual mode that these two interfaces provide, and details will provide later.
In the composition structure of this base station system, two transmitters and two receivers are arranged, corresponding different respectively carrier channels.The flow direction that transmits is: transmitter 1 and transmitter 2 produces transmitting of different carriers, enters synthetic one road signal behind the emission mixer, enters duplexer again.Delivering to antenna after putting by feeder line, lightning arrester, tower launches.The flow direction of received signal is: the signal that antenna receives by feeder line, tower put, lightning arrester enters duplexer, is divided into two-way via the received signal of duplexer by received branch unit, enters receiver 1 and receiver 2 respectively.
As previously mentioned, because duplexer, feeder, lightning arrester, tower is put and antenna all may produce the passive intermodulation product, cause harmful effect to the receiver received signal, therefore, each link needs all to guarantee that the passive intermodulation product is enough little, and need accomplish reliable the connection and low passive intermodulation product on the linkage interface of different parts.
Yet the size of the passive intermodulation product of whole base station is not only relevant with above-mentioned related parts, and is also relevant with the base station system fitting operation, and the passive intermodulation product also may rise after base station system was used a period of time, needed regular maintenance test.Traditional method is the performance that guarantees each parts respectively, and construction carefully came the passive intermodulation performance of safeguards system when linkage interface was installed.On the passive intermodulation performance guarantee of whole base station system, certain risk is arranged, and in case along with environmental impact and time transition can make that all unpredictable deterioration takes place base station system, this needs all base station system is carried out integrated testability easily.
The given whole Intermodulation Interference testing scheme of base station system of the present invention can address this problem, and makes the base station can support to connect the passive intermodulation product test of complete base station system, has improved the confidence level of the actual passive intermodulation performance metric of base station system greatly.In first execution mode of the present invention, press the integrated testability of following three key steps realization to base station system:
At first, the transmitter of controlling base station system to be measured is by the preset mode emissioning testing signal, the test signal here is the specific signal through design, can make that receiver signal to noise ratio when receiving is higher, the preset mode here promptly is the test signal of the required emission of each necessary link in the test job, the perhaps switching manipulation of transmitter;
Meanwhile, the receiver of control base station system scans reception by preset mode in the test frequency range, the reception of receiver must be corresponding with transmitter, and so-called scanning receives promptly carries out frequency sweep in receiving frequency range, and this is to be realized by the control of receiver to different channels;
At last, estimate the passive intermodulation performance of base station system according to the received signal spectrum analysis, after known test signal, can according to its corresponding received signal to recently monitoring out the size of Intermodulation Interference, thereby estimate.
Do not provide the details and the principle thereof of detailed emission mode, test signal, reception frequency range and assay method in the scheme of above-mentioned first execution mode, in execution mode, further illustrate one by one below.Second execution mode of the present invention is on the basis of first execution mode, and introducing is to the measurement and the removal of original external interference signal, and the emission of introducing test signal reaches synchronously and receives, the software realization of introducing test macro and control desk definition thereof etc.
Above-mentioned preset mode is that the emission of setting according to actual needs receives control flow, the pattern that is adopted in second execution mode is to close transmitter earlier to receive original external interference, successively according to the various test signals of order emission, receiver control synchronous scanning simultaneously receives the interference of these signals and generation then.Corresponding when estimating, also received signal to be deducted original external interference, to obtain pure test received signal, promptly have only the received signal that test signal produces and the signal of itself Intermodulation Interference.
Foregoing these steps in second execution mode, all realize by testing software, and are undertaken by test console control.Described testing software is a software additional on the base station system basis, need not can realize test by HardwareUpgring, reduces cost.The function of control desk in each step is as follows: base station system controls transmitter emission according to the order that test console issues; Base station system is uploaded to test console with the received signal of receiver; Test console finish to received signal analysis and the evaluation of passive intermodulation performance.The test console here is the computer background of testing software, and by the test maintaining personnel operation, this point is very easy to the carrying out of test.
Address testing software and test console, here provide the 3rd execution mode of the present invention, this execution mode is on the basis of second execution mode, attended operation test is for convenience carried out, make full use of two interfaces of the existing control side of base station system, two kinds of access waies at different demands are provided, be near-end control interface and far-end control interface, test console is directly controlled base station system by the near-end control interface, perhaps tests in far-end control base station system by base station controller interface and mobile communications network.
These two kinds of access waies inside of corresponding testing software are respectively installed or the far-end loading, and test console passes through directly installation testing software on base station system, perhaps loads testing software by far-end, to realize the control to base station system.As seen, two kinds of access waies of this that provides in the 3rd execution mode, especially second kind is inserted, loads the maintenance mode that testing software and control test are carried out by existing mobile network's far-end, be fit to very much the existing wide present situation of mobile network's Regional Distribution, solved attendant's difficulty well, be very easy to maintenance test work, saved human cost.
In view of this, the base station maintenance mode of operation will become convenient efficiently, be connected on the maintenance network of wireless system by interface such as the base station with base station controller, can long-range enforcement on each node of wireless system to the control of base station, therefore can the long-range operation of the base station being carried out passive intermodulation testing; The near-end control to the base station also can be implemented by the service port of base station near-end in the base station simultaneously.And the base station can built-in testing software of the present invention, or by near-end or far-end control interface on-line loaded testing software.When needs are tested base station system passive intermodulation performance, undertaken by following step.The data that base station testing obtains upload to background computer by the base station external interface, use the computer on backstage that test data is further analyzed, and obtain the passive intermodulation performance of base station system.
Fig. 2 provides the detailed process according to these schemes base station system method of testing in embodiments of the present invention.
In step 201, the maintenance test personnel are at near-end or remote console, by near-end control interface or network interface, insert base station to be measured,, then need to install or load testing software if the base station does not have testing software, after loading successfully, promptly enter test phase, transmitting order to lower levels is closed the base station normal workflow, enters testing process.
Then enter step 202, the test console transmitting order to lower levels, base station system is closed all transmitters, prepares to receive the external interference signal;
In step 203, test console makes base station system open receiver and receives original external interference signal in the test frequency range interscan of pre-estimating, and passes control desk back simultaneously, and control desk is preserved it;
Enter then in the step 204, control desk is according in advance setting, transmitting order to lower levels successively, and the transmitter of base station system is launched various test signals successively, and the frequency of these test signals, modulation system etc. are all by the order control of control desk;
Simultaneously in step 205, the receiver of base station system is synchronously tested the received signal that the frequency range interscan receives corresponding various test signals, and passes it back control desk, and it can be that channel to each frequency division multiplexing receives successively that scanning here receives.
In step 206, judge in the testing process whether finished transmitting and receiving of all test signals, be recycled in the step 207 if then withdraw from, penetrate test signal otherwise return step 204 relaying supervention.
In step 207, estimate according to the received signal of gathering on the backstage.At first remove original external interference signal in the received signal of the corresponding various test signals that receiver is received successively and obtain pure test received signal;
Then in step 208, the backstage is according to the spectrum analysis of this pure test received signal, and contrasts the frequency spectrum of its corresponding test signal, the passive intermodulation performance of overall merit base station system.
Notice in the above-mentioned flow process, how not mention the pattern of design test signal, and scope how to estimate to receive frequency range, in fact these 2 also is key of the present invention.How the design test signal makes received signal to noise ratio reach requirement, how to estimate that the scope that receives frequency range accurately makes performance test clearer and more definite, and these all influence testing efficiency and precision.To elaborate this two problems below.
The 4th execution mode of the present invention calculates the test band limits that receiver receives by the following method on the basis of second execution mode: earlier according to the carrier number to be tested of base station system, determine the exponent number of its passive intermodulation to be tested; According to the transmit frequency band scope of passive intermodulation exponent number and carrier wave, determine the band limits of passive intermodulation again; Calculate the common factor of the reception band limits of the band limits of passive intermodulation and base station system at last, promptly obtain testing the scope of frequency range.
For example in the second generation global system for mobile communications base station system of (Global System of MobileCommunication is called for short " GSM "), carrier frequency has two kinds of 900MHz and 1800MHz.
In the gsm communication system of 900MHz, the third-order intermodulation product that is produced by transmit frequency band can drop in the reception frequency range of oneself.Therefore for third order intermodulation IM3 to be measured, need further to calculate its frequency range.
The frequency of third-order intermodulation product is FIM3=2F1-F2.Be provided with according to typical P-GSM900 frequency range: base station frequency 935～960MHz.So F1 scope [935,960], F2 scope [935,960].The span that will calculate FIM3 earlier is the band limits of intermodulation, and then sees whether this frequency range and receiver frequency range have common factor, and its common factor is the test frequency range of the receiver that we ask if any.
Require the span of FIM3, as long as obtain its minimum value FIM3 (min) and maximum FIM3 (max),, try to achieve easily: FIM3 (min)=2F1min-F2max=2 * 935-960=910 according to transmit frequency range; FIM3 (max)=2F1max-F2min=2 * 960-935=985.So FIM3 scope [910,985].
And the base station receive frequency of P-GSM900 frequency range setting is 890～915MHz, and visible [910,985] have intersection with [890,915], and it occurs simultaneously just that the test frequency range of receiver is [910,915].
After the same method, can also calculate the more passive intermodulation product of high-order such as five rank.Falling into the five rank product signal frequency ranges that receive frequency range is: minimum value FIM5 (min) and maximum FIM5 (max): FIM5 (min)=3F1min-2F2max=3 * 935-2 * 960=885; FIM5 (max)=3F1max-2 * F2min=3 * 960-2 * 935=1010.As seen FIM5 [885,1010] also have intersection with [890,915], that is to say that the reception band limits of five rank intermodulation is [885,915].
Can determine promptly by such calculating whether each rank intermodulation product falls into range of receiving, thereby determine the test frequency range and receive this rank intermodulation product.
The broad band CDMA mobile communication of the third generation (Wideband Code Division MultipleAccess for another example, abbreviation " WCDMA ") in the base station system, the frequency range in I district is: base station frequency 2110MHz～2170MHz, the base station receive frequency is 1920MHz～1980MHz, by similar calculating, any two third-order intermodulation product that transmit can not drop in the reception frequency range of himself.By the traversal double counting that increases progressively by rank, can find that 7 rank are lowest-order products of passive intermodulation.The same computational methods: minimum value FIM7 (min) and maximum FIM7 (max): FIM7 (min)=4F1min-3F2max=4 * 2110-3 * 2170=1930; FIM7 (max)=4F1max-3 * F2min=4 * 2170-3 * 2110=2350.As seen, FIM7 scope [1930,2110] has intersection with range of receiving [1920,1980], that is to say that the test frequency range of the receiver reception of FIM7 is [1930,1980].
In addition, design and emission receive mode for test signal, the 4th execution mode of the present invention is realized as follows: test signal generally adopts continuous wave (Continous Wave), can improve received signal to noise ratio, transmitter is launched swept-frequency signal on a carrier wave therein, on other carrier waves, launch fixed frequency signal, traveled through after current fixed frequency transmits, fixed frequency transmitted change on another carrier frequency, once more to one of them carrier transmit swept-frequency signal, so circulation is until two all combination of frequencies that transmit; Above-mentioned emission signal frequency array sweeping can be deleted combination of frequency according to concrete condition, to reduce the testing time; Like this can be at whole Intermodulation Interference scope build-in test; Simultaneously receiver carries out synchronous scanning and receives in the intermodulation frequency range to be measured of test signal correspondence, so promptly can learn disturbed condition from the frequency spectrum severity of mixing up of the signal that receives.
Each order intermodulation product frequency relation is not satisfied in the configuration of the frequency of base station system operate as normal usually, so under the base station passive intermodulation performance situation that may descend, has caused interference still can not find to other receivers.The continuous wave signal of the present invention by forcing base station to be easy to detect, and the receiving and transmitting signal frequency of configurating base station is to the frequency of lowest-order product, and scanning base station transmit signals front and back obtain the passive intermodulation performance of base station system at the passive intermodulation product in passive intermodulation interval.
In sum, according to different tranmitting frequency and receive frequency working ranges, can calculate the frequency distribution of the lowest-order product of passive intermodulation.By disposing two frequencies that transmit and function, receiver is aimed at the frequency of intermodulation product and the power of product is measured, and can calculate the passive intermodulation performance of system.
Such as in the base station system of above-mentioned typical P-GSM900 frequency range, can know that by calculating the intermodulation product of lowest-order is 3 rank, 5 rank also fall into frequency acceptance band, can transmit according to two of the frequency relation configurations that transmit and receive that fall into frequency acceptance band, for example, the frequency of fixing a signal is at 935MHz, scan the frequency that another transmits, the result that budget arranged as can be known, another frequency begins to end to 960MHz from 955MHz, the signal third-order intermodulation product of itself and 935MHz drops on and receives in the frequency range, i.e. 910～915MHz.Receiver receive frequency and the synchronous emission signal frequency with scanning together change, and obtain the energy of three rank products in 910～915MHz, obtain the passive intermodulation performance by preceding method.Assumed transmit power is two 43dBm signals, and product is-100dBm that then the passive intermodulation performance is-143dBc.
Those of ordinary skill in the art are appreciated that, in the above-mentioned description to each execution mode of the present invention, the concrete parameter setting of being adopted, specific implementation details are for example, in various actual referencing environments, other different situations are arranged, but all within aim scope of the present invention, do not influence essence of the present invention and scope.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (8)
1. a passive intermodulation testing method of mobile communication base station system is characterized in that, comprises following steps
The transmitter of A base station system to be measured is pressed the preset mode emissioning testing signal;
The receiver of the described base station system of B scans reception by preset mode in the test frequency range;
C according to received signal spectrum analysis estimate the passive intermodulation performance of described base station system.
2. passive intermodulation testing method of mobile communication base station system according to claim 1 is characterized in that described steps A, B comprise following substep
The described Transmitter Turn-Off emission of A1;
The described receiver of B1 receives original external interference signal in the interscan of described test frequency range;
The described transmitter of A2 is launched at least a test signal successively;
The described receiver of B2 receives the received signal of corresponding described test signal successively in the interscan of described test frequency range.
3. passive intermodulation testing method of mobile communication base station system according to claim 2 is characterized in that described step C comprises following substep
Remove described original external interference signal in the received signal of the corresponding at least a described test signal that the described receiver of C1 receives successively and obtain pure test received signal;
C2 contrasts the frequency spectrum of the described test signal of its correspondence according to the spectrum analysis of described pure test received signal, the passive intermodulation performance of the described base station system of overall merit.
4. passive intermodulation testing method of mobile communication base station system according to claim 3 is characterized in that, the scope of the described test frequency range among the described step B is calculated by following criterion:
According to the carrier number to be tested of described base station system, determine the exponent number of its passive intermodulation to be tested earlier;
According to the transmit frequency band scope of described passive intermodulation exponent number and described carrier wave, determine the band limits of described passive intermodulation again;
Calculate the common factor of the reception band limits of the band limits of described passive intermodulation and described base station system at last, promptly obtain the scope of described test frequency range.
5. passive intermodulation testing method of mobile communication base station system according to claim 4, it is characterized in that in the described steps A 2, described test signal is a continuous wave, described transmitter is launched swept-frequency signal on a carrier wave therein, launches fixed frequency signal on other carrier waves; Traveled through after current fixed frequency transmits, fixed frequency is transmitted to be changed on another carrier frequency, and once more to one of them carrier transmit swept-frequency signal, so circulation is until two all combination of frequencies that transmit;
Among the described step B2, described receiver carries out synchronous scanning and receives in the intermodulation frequency range to be measured of described test signal correspondence.
6. passive intermodulation testing method of mobile communication base station system according to claim 5 is characterized in that, in the described steps A, described transmitter emission is controlled in the order that described base station system issues according to test console;
Among the described step B, described base station system is uploaded to described test console with the described received signal of described receiver;
Among the described step C, described test console is finished the evaluation to the analysis of described received signal and described passive intermodulation performance.
7. passive intermodulation testing method of mobile communication base station system according to claim 6, it is characterized in that, described test console is directly controlled described base station system by the near-end control interface, perhaps controls described base station system by base station controller interface and mobile communications network at far-end and tests.
8. passive intermodulation testing method of mobile communication base station system according to claim 7, it is characterized in that, described test console passes through directly installation testing software on described base station system, perhaps loads described testing software by far-end, to realize the control to described base station system.
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