CN101777955A - Radio frequency time template parameter test system and method for adjusting test range - Google Patents
Radio frequency time template parameter test system and method for adjusting test range Download PDFInfo
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Abstract
The invention discloses a radio frequency time template parameter test system, which comprises an transmitter, a radio frequency spectrograph, a synchronous variable radio frequency attenuator, the radio frequency spectrograph and a compensator, wherein the transmitter generates a synchronizing signal and a tested signal; the radio frequency spectrograph tests time template parameters according to the synchronizing signal and tested signal generated by the transmitter; the synchronous variable radio frequency attenuator is connected between the transmitter and the radio frequency spectrograph; the compensator is connected with the output end of the radio frequency spectrograph; and the radio frequency spectrograph attenuates the tested signal according to a preset decrement under the control of the synchronizing signal and outputs the attenuated signal. When the system and the method are used, the transmitter signal out of the test range of the radio frequency spectrograph can be tested and the precision on the radio frequency time template parameter test can be improved; and meanwhile, the test system has the advantages of simple structure, convenient operation and low cost. The invention also discloses a method for adjusting the range of the radio frequency time template parameter test.
Description
Technical field
The present invention relates to radio frequency (RF, Radio Frequency) parameter testing technology, test macro and a kind of method of regulating the radio frequency time template parameter test specification of particularly a kind of radio frequency time template (Time Mask) parameter.
Background technology
TD SDMA (the TD-SCDMA that has independent intellectual property right that proposes in China, Time Division-Synchronous Code Division Multiple Access) in the process of network size commercialization, operator and equipment supplier need carry out a large amount of uniformity test work to log equipment, wherein, comprise the RF consistency test of TD-SCDMA log equipment, for this reason, at 3G (Third Generation) Moblie partner plan (3GPP, 3rd Generation Partnership Project) in 25.142 agreement, standard in technology and the test has been carried out in the test of the time template parameter of transmitter in the system (TD base station), wherein, time template parameter promptly refers to the time dependent parameter index of the radio-frequency power of transmitter, and just transmitter is in the performance number of each fixed time point.
Concrete, in 3GPP 25.142 protocol specifications, the power level (being switch-off power (Transmit OFF Power)) of regulation transmitter signal in non-transmission time slot (receiving slot) must be less than-82dBm, and at transmission time slot, for the single carrier transmitter, the transmitting power (Transmit ON Power) that regulation transmits is minimum to be 25dBm.About other requirement and the standard of test, specifically can be referring to 3GPP 25.142 protocol specifications.Can determine the actual signal power level of transmitter by the test of time template parameter,, judge whether the signal power of this transmitter meets the requirements by this actual value and above-mentioned protocol specification are compared at non-transmission time slot and transmission time slot.
Fig. 1 is the test system structure schematic diagram of existing time template parameter, referring to Fig. 1, this test macro comprises: transmitter and radio frequency spectrometer, transmitter links to each other by cable with radio frequency spectrometer, wherein, transmitter, be used for sending 5ms frame synchronizing signal and measured signal to radio frequency spectrometer, the 5ms frame synchronizing signal is used for synchronous radio frequency spectrometer and notifies synchronous radio frequency spectrometer self residing operating state, and measured signal sends respectively according to the transmission time slot of transmitter demarcation and the requirement of receiving slot; After radio frequency spectrometer receives the 5ms frame synchronizing signal of transmitter transmission, trigger and carry out the test of time template parameter.Specifically, transmitter represents to be in transmission time slot or receiving slot by the high-low level of the 5ms frame synchronizing signal of transmission, if it is high level that radio frequency spectrometer detects the 5ms frame synchronizing signal of reception, the expression transmitter is in transmission time slot, then utilizes the measured signal that receives to carry out the time template parameter test of transmitter transmission time slot; If it is low level that radio frequency spectrometer detects the 5ms frame synchronizing signal of reception, the expression transmitter is in non-emission (reception) time slot, then utilizes the measured signal that receives to carry out the test of the time template parameter of the non-transmission time slot of transmitter.
Existing radio frequency spectrometer only can be in the interior input signal of its specified test specification by processing power, when the power of input signal surpasses its specified test specification, can't accurately measure the power of input signal.Because the consideration of technology and cost, the existing accessible measured signal maximum dynamic range of radio frequency spectrometer is generally 75dB.
And as previously mentioned, for the single carrier transmitter, even satisfy the minimum requirements of agreement regulation, then the power level difference of the signal of the signal of the transmission time slot of transmitter and non-transmission time slot (receiving slot) also can reach 107dB, i.e. the radio-frequency power dynamic range of the measured signal of receiving slot and transmission time slot is-82dBm～25dBm.If transmitter adopts powerful multicarrier form, then the radio frequency power level higher limit of the transmission time slot of its measured signal also can be bigger, makes the power level difference of measured signal further to increase.
As seen, for the transmitter that satisfies the agreement regulation, the power dynamic range level difference of its measured signal must surpass the maximum dynamic range (75dB) of existing radio frequency spectrometer, therefore will cause radio frequency spectrometer test overload, make test error increase, can't obtain testing time template parameter accurately.Wherein, the signal power level of receiving slot can remain in the specified test specification of radio frequency spectrometer usually, but the signal power level of transmission time slot can exceed the specified test specification of radio frequency spectrometer.
If by improving radio frequency spectrometer, its test specification is enlarged, will make the radio frequency spectrometer structure become very complicated again, also increased testing cost simultaneously greatly.Therefore, in the practical application, though the TD product industry standard that 3GPP agreement and Ministry of Industry and Information formulate all has clearly regulation for the time template parameter index, but because the technical capability of radio frequency spectrometer restriction, since the TD product network access testing in the end of the year in 2004 up to now, when the time template parameter dynamic range that is provided with when transmitter surpasses 75dB, the time template parameter index to this transmitter signal is not tested.
Summary of the invention
In view of this, the invention provides a kind of test macro of radio frequency time template parameter, can test the transmitter signal that exceeds the radio frequency spectrometer test specification.
The present invention also provides a kind of method of regulating the radio frequency time template parameter test specification, can test the transmitter signal that exceeds the radio frequency spectrometer test specification.
The test macro of a kind of radio frequency time template parameter provided by the invention, comprise: be used to produce the transmitter of synchronizing signal and measured signal and the radio frequency spectrometer that measured signal is carried out the time template parameter test according to the synchronizing signal that described transmitter produces, this test macro also comprises: be connected in synchronous variable radio frequency attenuator between described transmitter and the described radio frequency spectrometer and the compensator that is connected in described radio frequency spectrometer output
Synchronous variable radio frequency attenuator, be used under the control of the synchronizing signal that described transmitter produces, the measured signal that this transmitter is produced decays according to default attenuation, for described radio frequency spectrometer the measured signal time of implementation template parameter after decaying is tested.
Described default attenuation is to determine at the power parameter of its transmission time slot and receiving slot according to the specified test specification of described radio frequency spectrometer and described transmitter.
The more than one synchronous variable radio frequency attenuator of cascade is connected between described transmitter and the described radio frequency spectrometer mutually;
And all synchronous variable radio frequency attenuators equal described default attenuation to the decay total amount of described test signal.
Described default attenuation comprises transmission time slot attenuation and receiving slot attenuation, described synchronous variable radio frequency attenuator comprises: first single input dual output selector switch, according to the 2nd RF attenuator of described transmission time slot attenuation decay, according to the 3rd RF attenuator, the synchronous control signal generator of described receiving slot attenuation decay, wherein
One tunnel input of described first single input dual output selector switch links to each other with the input of described synchronous variable radio frequency attenuator, wherein one tunnel output links to each other with the input of described the 2nd RF attenuator, another road exports and link to each other with the input of described the 3rd RF attenuator;
The output of the output of described the 2nd RF attenuator and described the 3rd RF attenuator all links to each other with the output of described synchronous variable radio frequency attenuator;
Described synchronous control signal generator is used for when the synchronizing signal that described transmitter produces is represented transmission time slot, triggers one tunnel input and described wherein one tunnel output conducting of described first single input dual output selector switch; When the synchronizing signal of described transmitter generation is represented receiving slot, trigger one tunnel input of described first single input dual output selector switch and export conducting with described another road.
Between described synchronous variable radio frequency attenuator and the described radio frequency spectrometer, further connect one or cascade, be used for measured signal to described synchronous variable radio frequency attenuator output according to default attenuation decay more than a variable radio frequency attenuator;
And described synchronous variable radio frequency attenuator, all variable radio frequency attenuators equal described default attenuation to the decay total amount of described test signal.
Described variable radio frequency attenuator comprises: second single input dual output selector switch, the 4th RF attenuator and first switch controller,
One tunnel input of described second single input dual output selector switch links to each other with the input of described variable radio frequency attenuator, wherein one tunnel output links to each other with the output of described variable radio frequency attenuator, another road exports and link to each other with the input of described the 4th RF attenuator;
The output of described the 4th RF attenuator links to each other with the output of described variable radio frequency attenuator;
When described first switch controller arrives at the receiving slot of described transmitter, trigger one tunnel input and described wherein one tunnel output conducting of described second single input dual output selector switch; When the transmission time slot of described transmitter arrives, trigger one tunnel input and described another road output conducting of described second single input dual output selector switch.
Described variable radio frequency attenuator comprises: the 3rd single input dual output selector switch, the 5th RF attenuator, the 6th RF attenuator and second switch controller,
One tunnel input of the described the 3rd single input dual output selector switch links to each other with the input of described variable radio frequency attenuator, wherein one tunnel output links to each other with the input of described the 5th RF attenuator, another road exports and link to each other with the input of described the 6th RF attenuator;
The output of described the 5th RF attenuator links to each other with the output of described variable radio frequency attenuator;
The output of described the 6th RF attenuator links to each other with the output of described variable radio frequency attenuator;
When described second switch controller arrives at the receiving slot of described transmitter, trigger one tunnel input and described wherein one tunnel output conducting of the described the 3rd single input dual output selector switch; When the transmission time slot of described transmitter arrives, trigger one tunnel input and described another road output conducting of the described the 3rd single input dual output selector switch.
Between described synchronous variable radio frequency attenuator and the described transmitter, further at least one first radio frequency attenuator of cascade is used for the test signal that still decays without described synchronous variable radio frequency attenuator is decayed in advance.
The described first synchronous variable radio frequency attenuator is provided with a plurality of attenuation grades.
This system further comprises:
Compensator is used for the time template parameter to measured signal after the decay of described radio frequency spectrometer output, compensates the time template parameter of the measured signal before obtaining decaying according to described default attenuation.
A kind of method of regulating the radio frequency time template parameter test specification provided by the invention, this method comprises:
Under the control of the synchronizing signal that transmitter produces, the measured signal that this transmitter is produced is according to default attenuation decay, for the measured signal time of implementation template parameter test of radio frequency spectrometer after to decay.
As seen from the above technical solution, the method of the test macro of the radio frequency time template parameter of the embodiment of the invention and adjusting test specification, under the control of the synchronizing signal that transmitter produces, the measured signal that this transmitter is produced decays according to default attenuation, be contracted in the radio frequency spectrometer maximum dynamic range with power dynamic range level difference, thereby make that radio frequency spectrometer can be to the measured signal time of implementation template parameter test after the decay test signal.
And, the test signal that exceeds the radio frequency spectrometer maximum dynamic range for power dynamic range level difference, owing to make radio frequency spectrometer in specified dynamic test scope, can carry out the radio frequency time template parameter test exactly, thereby improved the precision of the radio frequency time template parameter of this measured signal to this measured signal.
In addition, after to the measured signal time of implementation template parameter test after the decay, only need by any-mode to the decay of radio frequency spectrometer output after the time template parameter of measured signal, compensate according to described default attenuation, can obtain the time template parameter of measured signal before of decaying, thereby can not influence the accuracy of test.
Description of drawings
Fig. 1 is the test system structure schematic diagram of existing time template parameter.
Fig. 2 is the test system structure schematic diagram of radio frequency time template parameter of the present invention.
Fig. 3 (a) is the structural representation of the synchronous variable radio frequency attenuator of the present invention.
Fig. 3 (b) is second structural representation of the synchronous variable radio frequency attenuator of the present invention.
Fig. 3 (c) is the structural representation of variable radio frequency attenuator of the present invention.
Fig. 4 regulates the method flow schematic diagram of radio frequency time template parameter test specification for the present invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
The embodiment of the invention is by before radio frequency spectrometer is tested, measured signal is decayed, measured signal is decayed in the dynamic test scope of radio frequency spectrometer, avoid radio frequency spectrometer test overload, thereby radio frequency spectrometer can be tested the measured signal that exceeds the specified dynamic test scope of radio frequency spectrometer in specified dynamic test scope.
In embodiments of the present invention, the processing that measured signal is decayed can have dual mode: as previously mentioned, the measured signal of transmission time slot exceeds the specified test specification of radio frequency spectrometer possibly, and the measured signal of receiving slot usually can be in the specified test specification of radio frequency spectrometer, therefore when decaying, can be only the measured signal of transmission time slot be decayed; Perhaps, also can the measured signal of transmission time slot and receiving slot all be decayed.
Below describe with the example that decays to the transmission time slot measured signal.
Fig. 2 is the test system structure schematic diagram of radio frequency time template parameter of the present invention.Referring to Fig. 2, this test macro comprises: transmitter, synchronous variable radio frequency attenuator, radio frequency spectrometer and compensator, wherein, synchronous variable radio frequency attenuator is connected between transmitter and the radio frequency spectrometer, compensator is connected in the radio frequency spectrometer output, link to each other by cable between variable radio frequency attenuator and the radio frequency spectrometer between transmitter and the synchronous variable radio frequency attenuator and synchronously
Transmitter is used to export measured signal and synchronizing signal;
In the present embodiment, transmitter is the TD base station, and synchronizing signal is the 5ms frame synchronizing signal.
The variable radio frequency attenuator is used under the control of the synchronizing signal that transmitter produces synchronously, and transmitter generation measured signal according to the attenuation decay back output of presetting, is tested the measured signal time of implementation template parameter after decaying for radio frequency spectrometer;
Specifically, the variable radio frequency attenuator determines that according to the synchronizing signal that receives transmitter is in the transmission time slot operating state synchronously, attenuation according to transmitter operating state transmission time slot state corresponding preset decays to the measured signal that receives in the dynamic range of radio frequency spectrometer test, and exports synchronizing signal to radio frequency spectrometer;
In the present embodiment, if determine that transmitter is in transmission time slot, export radio frequency spectrometer to after the measured signal that receives decayed according to attenuation default in the synchronous variable radio frequency attenuator,, export the measured signal that receives to radio frequency spectrometer if determine that transmitter is in receiving slot.
In the practical application, can according in the specified test specification of radio frequency spectrometer and the power parameter of the transmission time slot of transmitter nominal and receiving slot determine default attenuation, be in the specified test specification of radio frequency spectrometer to guarantee the measured signal power after overdamping.For instance, if the specified test specification of radio frequency spectrometer is :-90dBm～-20dBm, the power parameter of the transmission time slot that transmitter is demarcated is 30dBm, the power parameter of receiving slot is-85dBm that then Yu She attenuation can be 50dB.
Default attenuation also can comprise a plurality of attenuation grades, for example, for above-mentioned default attenuation is the synchronous variable radio frequency attenuator of 50dB, can set minimum amount of attenuation is 50dB, high attenuation is 80dB, between minimum amount of attenuation grade and high attenuation grade, set a plurality of in the middle of the attenuation numerical value, to regulate measured signal, radio frequency spectrometer is in the preferable test specification.
Radio frequency spectrometer is used for the measured signal after the receiving attenuation, carries out the time template parameter test, and the time template parameter of measured signal after the output attenuatoin;
Compensator is used for the time template parameter to measured signal after the decay of radio frequency spectrometer output, compensates according to default attenuation, the time template parameter of the measured signal before obtaining decaying.
Need to prove, the present invention wishes to solve how the transmitter signal that exceeds the radio frequency spectrometer test specification to be tested, after stating test so in realization, can not relate to and how obtain correct time template parameter, and how obtaining correct time template parameter can adopt any-mode to realize by those skilled in the art, therefore, above-mentioned compensator and the nonessential components and parts that comprise.
For example, for a person skilled in the art, as long as knowing radio frequency spectrometer is to test at decay back measured signal, after the radio frequency spectrometer output attenuatoin behind the time template parameter of measured signal, need not compensator also can be by for example manually calculating or compensating with the time template parameter of computer program to the back measured signal that decays so.
In the present embodiment, the test that radio frequency spectrometer carries out time template parameter to the measured signal that receives belongs to prior art, do not repeat them here, different is, owing in advance measured signal is decayed, thereby, after obtaining the time template parameter of test, this time template parameter that test need be obtained compensates according to attenuation default in the synchronous variable radio frequency attenuator, to obtain the real time template parameter of measured signal.For example, as previously mentioned, if the measured signal time template parameter of the transmission time slot that the radio frequency spectrometer test obtains is-15dBm that then the template parameter of the measured signal reality of transmission time slot is-15+50=35dBm; And the measured signal time template parameter of the receiving slot that test obtains is exactly the template parameter of the measured signal reality of transmission time slot.
In the practical application, variable radio frequency attenuator, radio frequency spectrometer and compensator also can be integrated in same physical entity synchronously, are about to synchronous variable radio frequency attenuator and compensator and are integrated in the device that forms the testing radio frequency time template parameter in the radio frequency spectrometer.In addition, the complexity of equipment also can be carried out cascade with a plurality of synchronous variable radio frequency attenuators, specifically when decaying greatly in order to reduce synchronous variable radio frequency attenuator, when a plurality of synchronous variable radio frequency attenuator cascade, its structure with exist the above-mentioned synchronous variable radio frequency attenuator can be identical; Also can be different, here, can be divided into two kinds of situations, first kind of situation, synchronously between variable radio frequency attenuator and the radio frequency spectrometer, connect one or cascade more than a variable radio frequency attenuator, be used for measured signal to synchronous variable radio frequency attenuator output according to default attenuation decay; And, synchronous variable radio frequency attenuator, all variable radio frequency attenuators attenuation that the decay total amount of test signal is equaled to preset.Second kind of situation need be carried out some to the synchronous variable radio frequency attenuator that is connected with transmitter and be changed, and below is that example describes with the synchronous variable radio frequency attenuator of two different structures of second kind of situation cascade.
The synchronous variable radio frequency attenuator that is connected with transmitter is set to three output ports, first output port is used to export synchronizing signal, and second output port is used to export the measured signal of receiving slot, and the 3rd output port is used to export the measured signal of transmission time slot, correspondingly
Back one synchronous variable radio frequency attenuator is set to three input ports and three output ports, the first input end mouth receives synchronizing signal, carry out transparent transmission, export by first output port, second input port receives the measured signal from synchronous variable radio frequency attenuator second output port output that is connected with transmitter, export by second output port, the 3rd input port receives the measured signal from synchronous variable radio frequency attenuator the 3rd output port output that is connected with transmitter, exports by the 3rd output port; Certainly, back one synchronous variable radio frequency attenuator also can be set to two input ports and two output ports, different with the synchronous variable radio frequency attenuator with three input ports is, synchronous variable radio frequency attenuator with two input ports does not need synchronizing signal, direct input radio frequency frequency spectrograph after the synchronous variable radio frequency attenuator output of synchronizing signal through being connected with transmitter.
Determine transmitter state and synchronizing signal is sent to next synchronous variable radio frequency attenuator according to the synchronizing signal that receives by the synchronous variable radio frequency attenuator that is connected with transmitter: if determine that transmitter is in the transmission time slot state, attenuation according to transmitter transmission time slot state corresponding preset decays the measured signal that receives, and the measured signal receiving port that exports the transmission time slot of back one synchronous variable radio frequency attenuator then to is proceeded decay; If determine that transmitter is in the receiving slot state, the measured signal that receives exported to the measured signal receiving port of the receiving slot of next synchronous variable radio frequency attenuator;
Certainly, under the situation about decaying for the measured signal that does not need receiving slot, back one synchronous variable radio frequency attenuator also can be set to one-input terminal mouth and single output port, and the synchronous variable radio frequency attenuator that is connected with transmitter is determined transmitter state and synchronizing signal directly is sent to radio frequency spectrometer according to the synchronizing signal that receives; Be in the transmission time slot state if determine transmitter, according to the attenuation of transmitter transmission time slot state corresponding preset the measured signal that receives decayed, the receiving port that exports next synchronous variable radio frequency attenuator then to is proceeded decay; If determine that transmitter is in the receiving slot state, directly export the measured signal that receives to radio frequency spectrometer.
Further, in order to obtain precise time template parameter test data more, before measuring, can use vector network analyzer that synchronous variable radio frequency attenuator is calibrated, for example, the stability of synchronous variable radio frequency attenuator and default attenuation etc. are calibrated, the relevant operating process that synchronous variable radio frequency attenuator is calibrated can not repeat them here referring to pertinent literature.
In addition; for the complexity of further protecting radio frequency spectrometer and reducing synchronous variable radio frequency attenuator; also the measured signal of transmitter output can be decayed to guarantee that measured signal does not exceed the specified test specification of radio frequency spectrometer in advance by the RF attenuator earlier; for example, attenuator can be the high power attenuator of a 10dB.Different with above-mentioned synchronous variable radio frequency attenuator is that this RF attenuator does not need the control of synchronizing signal, and identical decay is carried out in the measured signal of transmission time slot and receiving slot, like this, has reduced the complexity of attenuator structure yet.
Fig. 3 (a) is the structural representation of the synchronous variable radio frequency attenuator of the present invention, and referring to Fig. 3 (a), this synchronous variable radio frequency attenuator comprises: synchronous control signal generator, switch, RF attenuator, wherein,
The synchronous control signal generator, be used to receive synchronizing signal from transmitter, transmitter operating state control switch conducting or the shutoff RF attenuator definite according to synchronizing signal, and synchronizing signal exported, the RF attenuator with switch conduction after, with the measured signal that receives according to the back output that decays of default attenuation;
Specifically,, determine that transmitter is in transmission time slot, generate the synchronous control signal control switch and be connected conducting, the output RF attenuator is decayed the measured signal that receives according to default attenuation after with the RF attenuator if the synchronizing signal that receives is a high level; If the synchronizing signal that receives is a low level, determine that transmitter is in receiving slot, control switch is directly exported the measured signal that receives.
Switch can be the RF single-pole double-throw switch (SPDT), also can be other switch, as metal-oxide-semiconductor switch etc.
In the practical application, for the situation that simultaneously measured signal of the measured signal of transmission time slot and receiving slot is decayed according to default separately attenuation, can increase a RF attenuator again in the variable radio frequency attenuator synchronously, being used for the measured signal that receiving slot receives carries out exporting after the respective attenuation, different with the RF attenuator that is in transmission time slot is, the attenuation of this RF attenuator is much smaller, for example, and 1.5dB.
Fig. 3 (b) is second structural representation of the synchronous variable radio frequency attenuator of the present invention, referring to Fig. 3 (b), this synchronous variable radio frequency attenuator comprises: single input dual output selector switch, according to the RF attenuator of transmission time slot attenuation decay, according to RF attenuator, the synchronous control signal generator of receiving slot attenuation decay, wherein
One tunnel input of single input dual output selector switch links to each other with the input of synchronous variable radio frequency attenuator, wherein one tunnel output links to each other with the input of the RF attenuator of transmission time slot, export on another road links to each other with the input of the RF attenuator of receiving slot;
The output of the output of the RF attenuator of transmission time slot and the RF attenuator of receiving slot all links to each other with the output of synchronous variable radio frequency attenuator;
The synchronous control signal generator is used for when the synchronizing signal that transmitter produces is represented transmission time slot, triggers one tunnel input of single input dual output selector switch and wherein one tunnel output conducting; When the synchronizing signal of transmitter generation is represented receiving slot, trigger one tunnel input and the output conducting of another road of single input dual output selector switch.
Fig. 3 (c) is the structural representation of variable radio frequency attenuator of the present invention, referring to Fig. 3 (c), this variable radio frequency attenuator is used for linking to each other with Fig. 3 (b) variable radio frequency attenuator output synchronously, comprising: single input dual output selector switch, RF attenuator and switch controller
One tunnel input of single input dual output selector switch links to each other with the input of variable radio frequency attenuator, wherein one tunnel output links to each other with the output of variable radio frequency attenuator, another road exports and link to each other with the input of RF attenuator;
The output of RF attenuator links to each other with the output of variable radio frequency attenuator;
When switch controller arrives at the receiving slot of transmitter, trigger one tunnel input of single input dual output selector switch and wherein one tunnel output conducting; When the transmission time slot of transmitter arrives, trigger one tunnel input and another road output conducting of single input dual output selector switch.
Among Fig. 3 (c), what also can link to each other at the output with the variable radio frequency attenuator is connected in series a RF attenuator on the way again.
Therefore, the embodiment of the invention is before radio frequency spectrometer is tested measured signal, at first measured signal is decayed, make measured signal after the decay in the dynamic test scope of radio frequency spectrometer, like this, the bigger problem of test error of having avoided the overload in the radio frequency spectrometer test to cause, thereby radio frequency spectrometer can be tested in specified dynamic test scope to the measured signal that exceeds the specified dynamic test scope of radio frequency spectrometer, improved the precision of testing radio frequency time template parameter, simultaneously, test macro only need increase synchronous variable radio frequency attenuator, do not need radio frequency spectrometer is carried out complicated improvement, test system structure is simple, easy to operate, testing cost is low.
Fig. 4 regulates the method flow schematic diagram of radio frequency time template parameter test specification for the present invention.Referring to Fig. 4, this flow process comprises:
In this step, specifically comprise: the synchronizing signal that receiver/transmitter produces, determine the operating state of transmitter according to synchronizing signal, attenuation according to transmitter operating state corresponding preset decays to the measured signal that receives in the dynamic range of radio frequency spectrometer test, and exports synchronizing signal to radio frequency spectrometer.
Wherein,
The operating state of determining transmitter according to synchronizing signal is specially: if determine that the synchronizing signal that receives is a high level, then transmitter is in transmission time slot; If determine that the synchronizing signal that receives is a low level, then transmitter is in receiving slot.In the present embodiment, synchronizing signal is the 5ms frame synchronizing signal.
The transmission time slot that default attenuation is demarcated according to the specified test specification of radio frequency spectrometer and transmitter and the power parameter of receiving slot are set, and make power through the signal of synchronous variable radio frequency attenuator output in the specified suitable test specification of radio frequency spectrometer.
As previously mentioned, concrete attenuation operations can only be carried out the measured signal of transmission time slot, perhaps, also can the measured signal of transmission time slot and receiving slot all be decayed.Particularly,
If only the measured signal of transmission time slot is decayed, then Yu She attenuation is the transmission time slot attenuation, when setting this attenuation, is provided with according to the power parameter of the transmission time slot of transmitter demarcation and the specified test specification of radio frequency spectrometer.When carrying out attenuation operations, if determine that transmitter is in transmission time slot, the measured signal that receives is decayed according to default transmission time slot attenuation, if determine that transmitter is in receiving slot, the measured signal that receives is not dealt with.
If the measured signal to transmission time slot and receiving slot all decays, then Yu She attenuation is transmission time slot attenuation and receiving slot attenuation, when setting attenuation, the power parameter of the transmission time slot that need demarcate according to transmitter and the specified test specification of radio frequency spectrometer are provided with the transmission time slot attenuation, and the power parameter of the receiving slot of demarcating according to transmitter and the specified test specification of radio frequency spectrometer are provided with the receiving slot attenuation again.When carrying out attenuation operations, if determine that transmitter is in transmission time slot, the measured signal that receives is decayed according to default transmission time slot attenuation,, the measured signal that receives is decayed according to default receiving slot attenuation if determine that transmitter is in receiving slot.
In the practical application, default attenuation also can comprise a plurality of attenuation grades, preset a plurality of attenuation grades according to parameter and radio frequency spectrometer dynamic test scope that corresponding transmitter is demarcated, can reduce synchronous variable radio frequency attenuator number at each transmitter configuration, like this, parameter at the different transmitters demarcation, can select suitable attenuation grade that measured signal is decayed, to regulate measured signal, simultaneously, because the attenuation grade that is provided with is many, can also be according to the parameter and the preferable dynamic test scope of radio frequency spectrometer of corresponding transmitter demarcation, select corresponding attenuation grade, the measured signal that radio frequency spectrometer is received is in the preferable test specification.
In above-mentioned,, just measured signal is adjusted in the dynamic range of radio frequency spectrometer test the processing procedure of overload when avoiding the radio frequency spectrometer test to the processing that the measured signal that receives decays.The processing that decays can be to carry out attenuation processing one time, in the practical application, in order to reduce the decay complexity of equipment when excessive of attenuation processing, also can be to carry out repeatedly attenuation processing.For instance, if the decay of 50dB is carried out in the measured signal of transmission time slot, can be earlier the decay of 20dB to be carried out in the measured signal of transmission time slot, then the decay of 30dB is carried out in the measured signal after the 20dB decay again, making total attenuation is 50dB.
In this step, the testing process of radio frequency spectrometer is same as the prior art, does not repeat them here.
In this step, being about to test the time template parameter that obtains compensates according to default attenuation, for example, default attenuation is that the measured signal to receiving slot does not decay, and the measured signal of transmission time slot is carried out the decay of 40dB, then the time template parameter that the test receiving slot is obtained does not compensate, and the time template parameter that the test transmission time slot is obtained carries out the compensation of 40dB, thereby obtains the time template parameter of the measured signal before the decay.
In the practical application, the present invention also can be applied to some other when measured signal surpasses the testing equipment test specification, the occasion that need decay to measured signal.
More than lift preferred embodiment; the purpose, technical solutions and advantages of the present invention are further described; institute is understood that; the above only is preferred embodiment of the present invention; not in order to restriction the present invention; within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the test macro of a radio frequency time template parameter, this test macro comprises and is used to produce the transmitter of synchronizing signal and measured signal and according to the synchronizing signal that described transmitter produces the radio frequency spectrometer that time template parameter is tested is carried out in measured signal, it is characterized in that, this test macro also comprises: be connected in synchronous variable radio frequency attenuator between described transmitter and the described radio frequency spectrometer and the compensator that is connected in described radio frequency spectrometer output
Synchronous variable radio frequency attenuator, be used under the control of the synchronizing signal that described transmitter produces, the measured signal that this transmitter is produced decays according to default attenuation, for described radio frequency spectrometer the measured signal time of implementation template parameter after decaying is tested.
2. test macro as claimed in claim 1 is characterized in that, described default attenuation is to determine at the power parameter of its transmission time slot and receiving slot according to the specified test specification of described radio frequency spectrometer and described transmitter.
3. test macro as claimed in claim 2 is characterized in that, the more than one synchronous variable radio frequency attenuator of cascade is connected between described transmitter and the described radio frequency spectrometer mutually;
And all synchronous variable radio frequency attenuators equal described default attenuation to the decay total amount of described test signal.
4. as each described test macro in claim 2 or 3, it is characterized in that, described default attenuation comprises transmission time slot attenuation and receiving slot attenuation, described synchronous variable radio frequency attenuator comprises: first single input dual output selector switch, according to the 2nd RF attenuator of described transmission time slot attenuation decay, according to the 3rd RF attenuator, the synchronous control signal generator of described receiving slot attenuation decay, wherein
One tunnel input of described first single input dual output selector switch links to each other with the input of described synchronous variable radio frequency attenuator, wherein one tunnel output links to each other with the input of described the 2nd RF attenuator, another road exports and link to each other with the input of described the 3rd RF attenuator;
The output of the output of described the 2nd RF attenuator and described the 3rd RF attenuator all links to each other with the output of described synchronous variable radio frequency attenuator;
Described synchronous control signal generator is used for when the synchronizing signal that described transmitter produces is represented transmission time slot, triggers one tunnel input and described wherein one tunnel output conducting of described first single input dual output selector switch; When the synchronizing signal of described transmitter generation is represented receiving slot, trigger one tunnel input of described first single input dual output selector switch and export conducting with described another road.
5. test macro as claimed in claim 2, it is characterized in that, between described synchronous variable radio frequency attenuator and the described radio frequency spectrometer, further one of connection or cascade are used for the measured signal of described synchronous variable radio frequency attenuator output is decayed according to default attenuation more than a variable radio frequency attenuator;
And described synchronous variable radio frequency attenuator, all variable radio frequency attenuators equal described default attenuation to the decay total amount of described test signal.
6. test macro as claimed in claim 5 is characterized in that, described variable radio frequency attenuator comprises: second single input dual output selector switch, the 4th RF attenuator and first switch controller,
One tunnel input of described second single input dual output selector switch links to each other with the input of described variable radio frequency attenuator, wherein one tunnel output links to each other with the output of described variable radio frequency attenuator, another road exports and link to each other with the input of described the 4th RF attenuator;
The output of described the 4th RF attenuator links to each other with the output of described variable radio frequency attenuator;
When described first switch controller arrives at the receiving slot of described transmitter, trigger one tunnel input and described wherein one tunnel output conducting of described second single input dual output selector switch; When the transmission time slot of described transmitter arrives, trigger one tunnel input and described another road output conducting of described second single input dual output selector switch.
7. test macro as claimed in claim 5 is characterized in that, described variable radio frequency attenuator comprises: the 3rd single input dual output selector switch, the 5th RF attenuator, the 6th RF attenuator and second switch controller,
One tunnel input of the described the 3rd single input dual output selector switch links to each other with the input of described variable radio frequency attenuator, wherein one tunnel output links to each other with the input of described the 5th RF attenuator, another road exports and link to each other with the input of described the 6th RF attenuator;
The output of described the 5th RF attenuator links to each other with the output of described variable radio frequency attenuator;
The output of described the 6th RF attenuator links to each other with the output of described variable radio frequency attenuator;
When described second switch controller arrives at the receiving slot of described transmitter, trigger one tunnel input and described wherein one tunnel output conducting of the described the 3rd single input dual output selector switch; When the transmission time slot of described transmitter arrives, trigger one tunnel input and described another road output conducting of the described the 3rd single input dual output selector switch.
8. as each described test macro in claim 2 or 3 or 5 to 7, it is characterized in that, between described synchronous variable radio frequency attenuator and the described transmitter, further at least one first radio frequency attenuator of cascade is used for the test signal that still decays without described synchronous variable radio frequency attenuator is decayed in advance.
9. test macro as claimed in claim 2 is characterized in that, the described first synchronous variable radio frequency attenuator is provided with a plurality of attenuation grades.
10. as each described test macro in claim 2 or 3 or 5 to 7, it is characterized in that this system further comprises:
Compensator is used for the time template parameter to measured signal after the decay of described radio frequency spectrometer output, compensates the time template parameter of the measured signal before obtaining decaying according to described default attenuation.
11. a method of regulating the radio frequency time template parameter test specification is characterized in that, this method comprises:
Under the control of the synchronizing signal that transmitter produces, the measured signal that this transmitter is produced is according to default attenuation decay, for the measured signal time of implementation template parameter test of radio frequency spectrometer after to decay.
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| CN200910076944A CN101777955A (en) | 2009-01-14 | 2009-01-14 | Radio frequency time template parameter test system and method for adjusting test range |
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| CN200910076944A CN101777955A (en) | 2009-01-14 | 2009-01-14 | Radio frequency time template parameter test system and method for adjusting test range |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103873169A (en) * | 2014-03-19 | 2014-06-18 | 大唐移动通信设备有限公司 | Method and device for determining attenuation parameter in RF signal testing process |
| CN104980960A (en) * | 2015-07-14 | 2015-10-14 | 中国电子科技集团公司第四十一研究所 | Switching device for TD-LTE/TD-LTE-Advanced base station radio frequency conformance testing system |
| CN105548934A (en) * | 2016-01-04 | 2016-05-04 | 上海创远仪器技术股份有限公司 | Method for realizing rapid power automatic calibration of frequency spectrometer |
| CN109639317A (en) * | 2018-12-06 | 2019-04-16 | 京信通信系统（中国）有限公司 | Realize the synchronous method, device and the system using it of cpe device radiofrequency signal |
| CN113395122A (en) * | 2021-06-07 | 2021-09-14 | 杭州涂鸦信息技术有限公司 | Production test circuit board, radio frequency parameter calibration system, method and computer equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103873169A (en) * | 2014-03-19 | 2014-06-18 | 大唐移动通信设备有限公司 | Method and device for determining attenuation parameter in RF signal testing process |
| CN103873169B (en) * | 2014-03-19 | 2016-02-03 | 大唐移动通信设备有限公司 | For determining the method and apparatus of attenuation parameter in radiofrequency signal test process |
| CN104980960A (en) * | 2015-07-14 | 2015-10-14 | 中国电子科技集团公司第四十一研究所 | Switching device for TD-LTE/TD-LTE-Advanced base station radio frequency conformance testing system |
| CN105548934A (en) * | 2016-01-04 | 2016-05-04 | 上海创远仪器技术股份有限公司 | Method for realizing rapid power automatic calibration of frequency spectrometer |
| CN105548934B (en) * | 2016-01-04 | 2018-07-13 | 上海创远仪器技术股份有限公司 | The method for realizing fast power auto-scaling for frequency spectrograph |
| CN109639317A (en) * | 2018-12-06 | 2019-04-16 | 京信通信系统（中国）有限公司 | Realize the synchronous method, device and the system using it of cpe device radiofrequency signal |
| CN113395122A (en) * | 2021-06-07 | 2021-09-14 | 杭州涂鸦信息技术有限公司 | Production test circuit board, radio frequency parameter calibration system, method and computer equipment |
| CN113395122B (en) * | 2021-06-07 | 2023-04-07 | 杭州涂鸦信息技术有限公司 | Production test circuit board, radio frequency parameter calibration system, method and computer equipment |
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Application publication date: 20100714 |