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 a Radio Frequency (RF) parameter testing technique, and in particular, to a system for testing a Radio Frequency Time template (Time Mask) parameter and a method for adjusting a test range of the Radio Frequency Time template parameter.
Background
In the process of Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) network scale business proposed in china, which possesses proprietary intellectual property, operators and equipment suppliers need to perform a large amount of conformance testing work on network Access equipment, wherein radio frequency conformance testing of TD-SCDMA network Access equipment is included, and for this purpose, in the third Generation mobile communication Partnership Project (3 GPP) 25.142 protocol, technical and test specifications are performed on testing of Time template parameters of a transmitter (TD base station) in a system, wherein the Time template parameters refer to parameter indexes of radio frequency power of the transmitter changing with Time, that is, power values of the transmitter at various specified Time points.
Specifically, in the 3GPP 25.142 protocol specification, it is specified that the Power level (i.e., the OFF-Power) of a signal in a non-transmission time slot (reception time slot) of a transmitter must be less than-82 dBm, while in a transmission time slot, the transmission Power (Transmit ON Power) of a transmission signal is specified to be at least 25dBm for a single carrier transmitter. For other requirements and specifications of the test, see in particular the 3GPP 25.142 protocol specification. The actual signal power level of the transmitter in the non-transmitting time slot and the transmitting time slot can be determined through the test of the time template parameters, and whether the signal power of the transmitter meets the requirement or not is judged through comparing the actual value with the protocol specification.
Fig. 1 is a schematic structural diagram of a test system for parameters of a conventional time template, and referring to fig. 1, the test system includes: the system comprises a transmitter and a radio frequency spectrometer, wherein the transmitter is connected with the radio frequency spectrometer through a cable, the transmitter is used for transmitting a 5ms frame synchronization signal and a measured signal to the radio frequency spectrometer, the 5ms frame synchronization signal is used for synchronizing the radio frequency spectrometer and informing the synchronous radio frequency spectrometer of the working state of the synchronous radio frequency spectrometer, and the measured signal is respectively transmitted according to the requirements of a transmitting time slot and a receiving time slot which are calibrated by the transmitter; and after the radio frequency spectrum analyzer receives the 5ms frame synchronization signal sent by the transmitter, triggering to test the time template parameters. Specifically, the transmitter indicates whether the transmitter is in a transmitting time slot or a receiving time slot through the high and low levels of the transmitted 5ms frame synchronization signal, and if the radio frequency spectrometer detects that the received 5ms frame synchronization signal is high level and indicates that the transmitter is in the transmitting time slot, the received signal to be tested is used for carrying out time template parameter test on the transmitting time slot of the transmitter; if the radio frequency spectrometer detects that the received 5ms frame synchronization signal is low level, which indicates that the transmitter is in a non-transmitting (receiving) time slot, the received signal to be tested is used for testing the time template parameters of the non-transmitting time slot of the transmitter.
The existing radio frequency spectrometer can only process input signals with power within a rated test range, and when the power of the input signals exceeds the rated test range, the power of the input signals cannot be accurately measured. Due to technical and cost considerations, the maximum dynamic range of the measured signal that can be processed by existing radio frequency spectrometers is typically 75 dB.
As described above, even if the minimum requirements specified by the protocol are satisfied for a single carrier transmitter, the power level difference between the signal in the transmission slot and the signal in the non-transmission slot (reception slot) of the transmitter can reach 107dB, that is, the dynamic range of the radio frequency power of the signal to be measured in the reception slot and the transmission slot is-82 dBm to 25 dBm. If the transmitter adopts a high-power multi-carrier form, the upper limit value of the radio frequency power level of the transmitting time slot of the measured signal is larger, so that the power level difference of the measured signal is further increased.
Therefore, for a transmitter meeting the protocol specification, the level difference of the power dynamic range of the detected signal inevitably exceeds the maximum dynamic range (75dB) of the existing radio frequency spectrometer, so that the radio frequency spectrometer is overloaded for testing, the testing error is increased, and the accurate testing time template parameter cannot be obtained. Wherein the signal power level of the receive time slot can generally be maintained within the nominal test range of the radio frequency spectrometer, but the signal power level of the transmit time slot may exceed the nominal test range of the radio frequency spectrometer.
If the radio frequency spectrometer is improved, the test range is enlarged, the structure of the radio frequency spectrometer becomes very complicated, and the test cost is greatly increased. Therefore, in practical applications, although the TD product industry standard established by the 3GPP protocol and the ministry of industry and trust is well-defined for the time template parameter index, the time template parameter index of the transmitter signal will not be tested until the time when the dynamic range of the time template parameter set by the transmitter exceeds 75dB from the TD product network test started in the year 2004 due to the technical capability limitation of the radio frequency spectrometer.
Disclosure of Invention
In view of the above, the present invention provides a system for testing radio frequency time template parameters, which is capable of testing transmitter signals beyond the testing range of a radio frequency spectrometer.
The invention also provides a method for adjusting the parameter testing range of the radio frequency time template, which can test the transmitter signal beyond the testing range of the radio frequency spectrometer.
The invention provides a system for testing radio frequency time template parameters, which comprises: the test system comprises a transmitter for generating a synchronous signal and a signal to be tested, and a radio frequency spectrometer for performing time template parameter test on the signal to be tested according to the synchronous signal generated by the transmitter, and further comprises: a synchronous variable radio frequency attenuator connected between the transmitter and the radio frequency spectrometer, and a compensator connected to an output of the radio frequency spectrometer,
and the synchronous variable radio frequency attenuator is used for attenuating the measured signal generated by the transmitter according to a preset attenuation amount under the control of the synchronous signal generated by the transmitter so as to enable the radio frequency spectrometer to perform time template parameter test on the attenuated measured signal.
The preset attenuation amount is determined according to a rated test range of the radio frequency spectrometer and power parameters of the transmitter in a transmitting time slot and a receiving time slot of the transmitter.
More than one synchronous variable radio frequency attenuator which is cascaded with each other is connected between the transmitter and the radio frequency spectrometer;
and the total amount of the attenuation of all the synchronous variable radio frequency attenuators to the test signal is equal to the preset attenuation amount.
The preset attenuation amount comprises a transmitting time slot attenuation amount and a receiving time slot attenuation amount, and the synchronous variable radio frequency attenuator comprises: a first single-input dual-output selection switch, a second RF attenuator attenuated according to the attenuation amount of the transmitting time slot, a third RF attenuator attenuated according to the attenuation amount of the receiving time slot, and a synchronous control signal generator,
one input of the first single-input double-output selection switch is connected with the input end of the synchronous variable radio frequency attenuator, one output of the first single-input double-output selection switch is connected with the input of the second RF attenuator, and the other output of the first single-input double-output selection switch is connected with the input of the third RF attenuator;
the output of the second RF attenuator and the output of the third RF attenuator are both connected with the output end of the synchronous variable radio frequency attenuator;
the synchronous control signal generator is used for triggering one input of the first single-input double-output selection switch to be conducted with one output when a synchronous signal generated by the transmitter represents a transmission time slot; and when the synchronous signal generated by the transmitter represents a receiving time slot, triggering one path of input of the first single-input double-output selection switch to be conducted with the other path of output.
The synchronous variable radio frequency attenuator is connected with the radio frequency spectrometer, and is used for attenuating a detected signal output by the synchronous variable radio frequency attenuator according to a preset attenuation amount;
and the total amount of the attenuation of the synchronous variable radio frequency attenuator and all the variable radio frequency attenuators to the test signal is equal to the preset attenuation amount.
The variable radio frequency attenuator includes: a second single-input dual-output selection switch, a fourth RF attenuator, and a first switching controller,
one input of the second single-input double-output selection switch is connected with the input end of the variable radio frequency attenuator, one output of the second single-input double-output selection switch is connected with the output end of the variable radio frequency attenuator, and the other output of the second single-input double-output selection switch is connected with the input of the fourth radio frequency attenuator;
the output of the fourth RF attenuator is connected with the output end of the variable radio frequency attenuator;
when the receiving time slot of the transmitter comes, the first switching controller triggers one input of the second single-input double-output selection switch to be conducted with one output; and when the transmitting time slot of the transmitter arrives, triggering one path of input of the second single-input double-output selection switch to be conducted with the other path of output.
The variable radio frequency attenuator includes: a third single-input dual-output selection switch, a fifth RF attenuator, a sixth RF attenuator, and a second switching controller,
one input of the third single-input double-output selection switch is connected with the input end of the variable radio frequency attenuator, one output of the third single-input double-output selection switch is connected with the input of the fifth RF attenuator, and the other output of the third single-input double-output selection switch is connected with the input of the sixth RF attenuator;
the output of the fifth RF attenuator is connected with the output end of the variable radio frequency attenuator;
the output of the sixth RF attenuator is connected with the output end of the variable radio frequency attenuator;
when the receiving time slot of the transmitter comes, the second switching controller triggers one input of the third single-input double-output selection switch to be conducted with one output; and when the transmitting time slot of the transmitter arrives, triggering one path of input of the third single-input double-output selection switch to be conducted with the other path of output.
At least one first radio frequency RF attenuator is further cascaded between the synchronous variable radio frequency attenuator and the transmitter and is used for pre-attenuating the test signal which is not attenuated by the synchronous variable radio frequency attenuator.
The first synchronous variable radio frequency attenuator is provided with a plurality of attenuation levels.
The system further comprises:
and the compensator is used for compensating the time template parameters of the attenuated measured signals output by the radio frequency spectrometer according to the preset attenuation amount to obtain the time template parameters of the measured signals before attenuation.
The invention provides a method for adjusting a parameter test range of a radio frequency time template, which comprises the following steps:
and under the control of the synchronous signal generated by the transmitter, attenuating the measured signal generated by the transmitter according to a preset attenuation amount so as to enable the radio frequency spectrometer to perform time template parameter test on the attenuated measured signal.
According to the technical scheme, the test system of the radio frequency time template parameter and the method for adjusting the test range attenuate the tested signal generated by the transmitter according to the preset attenuation amount under the control of the synchronous signal generated by the transmitter so as to reduce the level difference of the power dynamic range of the tested signal to be within the maximum dynamic range of the radio frequency spectrum instrument, so that the radio frequency spectrum instrument can perform the time template parameter test on the attenuated tested signal.
Moreover, for the test signal with the level difference of the power dynamic range exceeding the maximum dynamic range of the radio frequency spectrometer, the radio frequency spectrometer can accurately test the radio frequency time template parameters of the tested signal in the rated dynamic test range, so the precision of the radio frequency time template parameters of the tested signal is improved.
In addition, after the time template parameter test is carried out on the attenuated measured signal, the time template parameter of the attenuated measured signal output by the radio frequency spectrometer is compensated in any mode according to the preset attenuation amount, and the time template parameter of the measured signal before attenuation can be obtained, so that the test accuracy is not influenced.
Drawings
Fig. 1 is a schematic structural diagram of a conventional time template parameter testing system.
FIG. 2 is a schematic diagram of a system for testing RF time template parameters according to the present invention.
FIG. 3(a) is a schematic diagram of the structure of the synchronous variable RF attenuator of the present invention.
FIG. 3(b) is a schematic diagram of a second structure of the synchronous variable RF attenuator of the present invention.
FIG. 3(c) is a schematic diagram of the structure of the variable RF attenuator of the present invention.
FIG. 4 is a flowchart illustrating a method for adjusting a test range of RF time template parameters according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and examples.
The embodiment of the invention attenuates the tested signal before the test of the radio frequency spectrometer, so that the tested signal is attenuated to the dynamic test range of the radio frequency spectrometer, and the overload of the test of the radio frequency spectrometer is avoided, thereby enabling the radio frequency spectrometer to test the tested signal beyond the rated dynamic test range of the radio frequency spectrometer in the rated dynamic test range.
In the embodiment of the present invention, there are two ways to attenuate the measured signal: as mentioned above, the signal under test of the transmission timeslot is likely to exceed the rated test range of the radio frequency spectrometer, while the signal under test of the reception timeslot is typically within the rated test range of the radio frequency spectrometer, so that when attenuation is performed, only the signal under test of the transmission timeslot may be attenuated; alternatively, the measured signals of both the transmit time slot and the receive time slot may be attenuated.
The attenuation of the measured signal in the transmission time slot is explained as an example.
FIG. 2 is a schematic diagram of a system for testing RF time template parameters according to the present invention. Referring to fig. 2, the test system includes: the system comprises a transmitter, a synchronous variable radio frequency attenuator, a radio frequency spectrometer and a compensator, wherein the synchronous variable radio frequency attenuator is connected between the transmitter and the radio frequency spectrometer, the compensator is connected with the output end of the radio frequency spectrometer, the transmitter and the synchronous variable radio frequency attenuator, and the synchronous variable radio frequency attenuator and the radio frequency spectrometer are connected through cables,
a transmitter for outputting a signal under test and a synchronization signal;
in this embodiment, the transmitter is a TD base station, and the synchronization signal is a 5ms frame synchronization signal.
The synchronous variable radio frequency attenuator is used for attenuating the signal to be measured generated by the transmitter according to a preset attenuation amount and then outputting the signal to be measured under the control of the synchronous signal generated by the transmitter so as to enable the radio frequency spectrometer to perform time template parameter test on the attenuated signal to be measured;
specifically, the synchronous variable radio frequency attenuator determines that the transmitter is in a transmission time slot working state according to the received synchronous signal, attenuates the received signal to be tested to a dynamic range tested by the radio frequency spectrometer according to a preset attenuation amount corresponding to the transmission time slot state of the transmitter working state, and outputs the synchronous signal to the radio frequency spectrometer;
in this embodiment, if it is determined that the transmitter is in the transmission timeslot, the received measured signal is attenuated according to the attenuation preset in the synchronous variable radio frequency attenuator and then output to the radio frequency spectrometer, and if it is determined that the transmitter is in the reception timeslot, the received measured signal is output to the radio frequency spectrometer.
In practical application, the preset attenuation amount can be determined according to the power parameters of the nominal test range of the radio frequency spectrometer and the nominal transmission time slot and receiving time slot of the transmitter, so as to ensure that the power of the measured signal after attenuation is within the nominal test range of the radio frequency spectrometer. For example, if the nominal test range of the radio frequency spectrometer is: the preset attenuation amount can be 50dB if the power parameter of a transmitting time slot calibrated by a transmitter is 30dBm and the power parameter of a receiving time slot is-85 dBm.
The preset attenuation may also include a plurality of attenuation levels, for example, for the synchronous variable rf attenuator with the preset attenuation of 50dB, the lowest attenuation may be set to 50dB, the highest attenuation may be set to 80dB, and a plurality of intermediate attenuation values may be set between the lowest attenuation level and the highest attenuation level to adjust the signal to be measured so that the rf spectrometer is in a better test range.
The radio frequency spectrometer is used for receiving the attenuated measured signal, carrying out time template parameter test and outputting the time template parameter of the attenuated measured signal;
and the compensator is used for compensating the time template parameters of the attenuated measured signals output by the radio frequency spectrometer according to the preset attenuation amount to obtain the time template parameters of the measured signals before attenuation.
It should be noted that the present invention is intended to solve the problem of how to test a transmitter signal beyond the test range of the radio frequency spectrometer, and therefore, after the test is performed, how to obtain the correct time template parameters may not be involved, and how to obtain the correct time template parameters may be implemented by any means by those skilled in the art, and therefore, the compensator is not required to include components.
For example, it is obvious to those skilled in the art that, if it is known that the radio frequency spectrometer is used for testing the attenuated signal to be tested, the time template parameters of the attenuated signal to be tested may be compensated by, for example, manual calculation or a computer program without a compensator after the radio frequency spectrometer outputs the time template parameters of the attenuated signal to be tested.
In this embodiment, the radio frequency spectrometer performs the time template parameter test on the received signal to be tested, which belongs to the prior art and is not described herein again, except that the signal to be tested is attenuated in advance, so after the time template parameter of the test is obtained, the time template parameter obtained by the test needs to be compensated according to the attenuation preset in the synchronous variable radio frequency attenuator to obtain the actual time template parameter of the signal to be tested. For example, as described above, if the measured signal time template parameter of the transmission timeslot obtained by the radio frequency spectrometer is-15 dBm, the actual template parameter of the measured signal of the transmission timeslot is-15 + 50-35 dBm; and the tested signal time template parameter of the receiving time slot obtained by the test is the actual template parameter of the tested signal of the transmitting time slot.
In practical applications, the synchronous variable rf attenuator, the rf spectrometer and the compensator may also be integrated into the same physical entity, i.e. the synchronous variable rf attenuator and the compensator are integrated into the rf spectrometer to form a device for testing the rf time template parameters. In addition, in order to reduce the complexity of the device when the attenuation of the synchronous variable radio frequency attenuator is large, a plurality of synchronous variable radio frequency attenuators can be cascaded, and particularly, when the plurality of synchronous variable radio frequency attenuators are cascaded, the structure of the synchronous variable radio frequency attenuator can be the same as that of the synchronous variable radio frequency attenuator; the first condition is that one or more than one variable radio frequency attenuator is connected or cascaded between the synchronous variable radio frequency attenuator and the radio frequency spectrometer and is used for attenuating the measured signal output by the synchronous variable radio frequency attenuator according to a preset attenuation; and the total amount of attenuation of the synchronous variable radio frequency attenuator and all the variable radio frequency attenuators to the test signal is equal to the preset attenuation amount. In the second case, some modifications are required to the synchronous variable rf attenuator connected to the transmitter, and the two cascaded synchronous variable rf attenuators with different structures in the second case are taken as an example for explanation.
The synchronous variable radio frequency attenuator connected with the transmitter is set into three output ports, the first output port is used for outputting synchronous signals, the second output port is used for outputting tested signals of receiving time slots, the third output port is used for outputting tested signals of transmitting time slots, correspondingly,
the rear synchronous variable radio frequency attenuator is provided with three input ports and three output ports, wherein the first input port receives synchronous signals, performs transparent transmission and outputs the signals through the first output port, the second input port receives tested signals output from the second output port of the synchronous variable radio frequency attenuator connected with the transmitter and outputs the signals through the second output port, and the third input port receives tested signals output from the third output port of the synchronous variable radio frequency attenuator connected with the transmitter and outputs the signals through the third output port; of course, the latter synchronous variable rf attenuator may also be set to two input ports and two output ports, and unlike the synchronous variable rf attenuator with three input ports, the synchronous variable rf attenuator with two input ports does not require a synchronization signal, and the synchronization signal is directly input to the rf spectrometer after being output by the synchronous variable rf attenuator connected to the transmitter.
Determining the state of the transmitter by a synchronous variable radio frequency attenuator connected with the transmitter according to the received synchronous signal and sending the synchronous signal to the next synchronous variable radio frequency attenuator: if the transmitter is determined to be in a transmitting time slot state, attenuating the received signal to be tested according to a preset attenuation amount corresponding to the transmitting time slot state of the transmitter, and then outputting the signal to be tested to a signal receiving port of a transmitting time slot of a subsequent synchronous variable radio frequency attenuator to continue attenuating; if the transmitter is determined to be in a receiving time slot state, outputting the received measured signal to a measured signal receiving port of a receiving time slot of the next synchronous variable radio frequency attenuator;
certainly, under the condition that the measured signal of the receiving time slot does not need to be attenuated, the subsequent synchronous variable radio frequency attenuator can also be set as a single input port and a single output port, and the synchronous variable radio frequency attenuator connected with the transmitter determines the state of the transmitter according to the received synchronous signal and directly transmits the synchronous signal to the radio frequency spectrometer; if the transmitter is determined to be in the transmitting time slot state, attenuating the received detected signal according to the preset attenuation amount corresponding to the transmitting time slot state of the transmitter, and then outputting the attenuated signal to a receiving port of the next synchronous variable radio frequency attenuator for continuous attenuation; and if the transmitter is determined to be in the receiving time slot state, directly outputting the received measured signal to the radio frequency spectrometer.
Further, in order to obtain more accurate time template parameter test data, a vector network analyzer may be used to calibrate the synchronous variable radio frequency attenuator before measurement, for example, to calibrate the stability and the preset attenuation of the synchronous variable radio frequency attenuator, and for an operation procedure for calibrating the synchronous variable radio frequency attenuator, reference may be made to related documents, which are not described herein again.
In addition, in order to further protect the RF spectrometer and reduce the complexity of the synchronous variable RF attenuator, the signal to be measured output by the transmitter may be pre-attenuated by the RF attenuator to ensure that the signal to be measured does not exceed the rated test range of the RF spectrometer, for example, the attenuator may be a 10dB high power attenuator. Unlike the synchronous variable radio frequency attenuator, the RF attenuator does not need the control of a synchronous signal and performs the same attenuation on the measured signals of the transmitting time slot and the receiving time slot, thereby reducing the complexity of the attenuator structure.
Fig. 3(a) is a schematic structural diagram of the synchronous variable rf attenuator of the present invention, referring to fig. 3(a), the synchronous variable rf attenuator comprises: synchronizing the control signal generator, the switch, the RF attenuator, wherein,
the synchronous control signal generator is used for receiving a synchronous signal from the transmitter, controlling the switch to switch on or switch off the RF attenuator according to the working state of the transmitter determined by the synchronous signal and outputting the synchronous signal, and after the RF attenuator is switched on with the switch, attenuating the received measured signal according to a preset attenuation amount and then outputting the attenuated signal;
specifically, if the received synchronous signal is at a high level, the transmitter is determined to be in a transmitting time slot, a synchronous control signal is generated to control the switch to be connected and conducted with the RF attenuator, and the RF attenuator attenuates the received detected signal according to a preset attenuation amount and then outputs the attenuated signal; if the received synchronous signal is low level, the transmitter is determined to be in the receiving time slot, and the control switch directly outputs the received detected signal.
The switch can be an RF single-pole double-throw switch, and can also be other switches, such as a MOS tube switch and the like.
In practical application, for the case of simultaneously attenuating the measured signal of the transmission timeslot and the measured signal of the reception timeslot according to the respective preset attenuation amounts, an RF attenuator may be further added in the synchronous variable radio frequency attenuator for outputting the measured signal received by the reception timeslot after being correspondingly attenuated, and the attenuation amount of the RF attenuator is much smaller than that of the RF attenuator in the transmission timeslot, for example, 1.5 dB.
FIG. 3(b) is a schematic diagram of a second structure of the synchronous variable RF attenuator of the present invention, referring to FIG. 3(b), which comprises: a single-input double-output selection switch, an RF attenuator attenuated according to the attenuation amount of a transmitting time slot, an RF attenuator attenuated according to the attenuation amount of a receiving time slot, and a synchronous control signal generator,
one input of the single-input double-output selection switch is connected with the input end of the synchronous variable radio frequency attenuator, one output of the single-input double-output selection switch is connected with the input of the RF attenuator of the transmitting time slot, and the other output of the single-input double-output selection switch is connected with the input of the RF attenuator of the receiving time slot;
the output of the RF attenuator of the transmitting time slot and the output of the RF attenuator of the receiving time slot are both connected with the output end of the synchronous variable radio frequency attenuator;
the synchronous control signal generator is used for triggering one input of the single-input double-output selection switch to be conducted with one output when a synchronous signal generated by the transmitter represents a transmitting time slot; when the synchronous signal generated by the transmitter represents a receiving time slot, one input of the single-input double-output selection switch is triggered to be conducted with the other output.
FIG. 3(c) is a schematic structural diagram of the variable RF attenuator of the present invention, referring to FIG. 3(c), which is used to connect with the output of the synchronous variable RF attenuator in FIG. 3(b), and comprises: a single-input dual-output selection switch, an RF attenuator, and a switching controller,
one input of the single-input double-output selection switch is connected with the input end of the variable radio frequency attenuator, one output of the single-input double-output selection switch is connected with the output end of the variable radio frequency attenuator, and the other output of the single-input double-output selection switch is connected with the input of the RF attenuator;
the output of the RF attenuator is connected with the output end of the variable radio frequency attenuator;
when the receiving time slot of the transmitter comes, the switching controller triggers one input of the single-input double-output selection switch to be conducted with one output; when the transmitting time slot of the transmitter comes, one input of the single-input double-output selection switch is triggered to be conducted with the other output.
In fig. 3(c), an RF attenuator may be connected in series to the path connected to the output terminal of the variable RF attenuator.
Therefore, the embodiment of the invention firstly attenuates the measured signal before the radio frequency spectrometer tests the measured signal, so that the attenuated measured signal is in the dynamic test range of the radio frequency spectrometer, thus avoiding the problem of larger test error caused by overload in the test of the radio frequency spectrometer, further enabling the radio frequency spectrometer to test the measured signal which exceeds the rated dynamic test range of the radio frequency spectrometer in the rated dynamic test range, improving the precision of testing the radio frequency time template parameters, simultaneously, the test system only needs to increase a synchronous variable radio frequency attenuator, and does not need to perform complex improvement on the radio frequency spectrometer, and the test system has simple structure, convenient operation and low test cost.
FIG. 4 is a flowchart illustrating a method for adjusting a test range of RF time template parameters according to the present invention. Referring to fig. 4, the process includes:
in this step, specifically, the method includes: receiving a synchronous signal generated by a transmitter, determining the working state of the transmitter according to the synchronous signal, attenuating the received signal to be tested to the dynamic range tested by the radio frequency spectrometer according to the preset attenuation amount corresponding to the working state of the transmitter, and outputting the synchronous signal to the radio frequency spectrometer.
Wherein,
determining the working state of the transmitter according to the synchronization signal specifically comprises: if the received synchronous signal is determined to be high level, the transmitter is in a transmitting time slot; if it is determined that the received synchronization signal is low, the transmitter is in a reception slot. In this embodiment, the synchronization signal is a 5ms frame synchronization signal.
The preset attenuation is set according to the rated test range of the radio frequency spectrometer and the power parameters of the transmitting time slot and the receiving time slot calibrated by the transmitter, so that the power of the signal output by the synchronous variable radio frequency attenuator is in the rated proper test range of the radio frequency spectrometer.
As mentioned above, the specific attenuation operation may be performed only on the measured signal in the transmission time slot, or may also be performed on the measured signals in both the transmission time slot and the reception time slot. In particular, the amount of the solvent to be used,
if only the measured signal of the transmitting time slot is attenuated, the preset attenuation amount is the transmitting time slot attenuation amount, and when the attenuation amount is set, the setting is carried out according to the power parameter of the transmitting time slot calibrated by the transmitter and the rated test range of the radio frequency spectrometer. And when attenuation operation is carried out, if the transmitter is determined to be in a transmitting time slot, attenuating the received measured signal according to a preset transmitting time slot attenuation amount, and if the transmitter is determined to be in a receiving time slot, not processing the received measured signal.
If the measured signals of the transmitting time slot and the receiving time slot are attenuated, the preset attenuation amounts are the transmitting time slot attenuation amount and the receiving time slot attenuation amount, when the attenuation amounts are set, the transmitting time slot attenuation amount needs to be set according to the power parameter of the transmitting time slot calibrated by the transmitter and the rated test range of the radio frequency spectrometer, and then the receiving time slot attenuation amount needs to be set according to the power parameter of the receiving time slot calibrated by the transmitter and the rated test range of the radio frequency spectrometer. And when attenuation operation is carried out, if the transmitter is determined to be in a transmitting time slot, attenuating the received measured signal according to the preset transmitting time slot attenuation amount, and if the transmitter is determined to be in a receiving time slot, attenuating the received measured signal according to the preset receiving time slot attenuation amount.
In practical application, the preset attenuation amount may also include a plurality of attenuation amount grades, and the plurality of attenuation amount grades are preset according to the parameter calibrated by the corresponding transmitter and the dynamic test range of the radio frequency spectrometer, so that the number of the synchronous variable radio frequency attenuators configured for each transmitter can be reduced, and thus, for the parameters calibrated by different transmitters, an appropriate attenuation amount grade can be selected to attenuate the signal to be measured, so as to adjust the signal to be measured.
In the foregoing, the received signal to be tested is attenuated, that is, the signal to be tested is adjusted to be within the dynamic range of the radio frequency spectrometer test, so as to avoid the processing process of overload during the radio frequency spectrometer test. The attenuation may be performed once, or may be performed several times in order to reduce the complexity of the device when the attenuation of one attenuation is too large in practical applications. For example, if the measured signal of the transmission timeslot is attenuated by 50dB, the measured signal of the transmission timeslot may be first attenuated by 20dB, and then the measured signal after 20dB attenuation is further attenuated by 30dB, so that the total attenuation amount is 50 dB.
in this step, the testing process of the radio frequency spectrometer is the same as that of the prior art, and is not described herein again.
And 403, compensating the time template parameters obtained by the test according to the attenuation of the attenuation to obtain the actual time template parameters of the measured signal.
In this step, the time template parameters to be tested and obtained are compensated according to the preset attenuation amount, for example, if the preset attenuation amount is not to attenuate the tested signal of the receiving time slot and 40dB to attenuate the tested signal of the transmitting time slot, the time template parameters to be tested and obtained by testing the receiving time slot are not compensated, and the time template parameters to be tested and obtained by testing the transmitting time slot are compensated by 40dB, so as to obtain the time template parameters of the tested signal before attenuation.
In practical application, the invention can also be applied to other occasions when the tested signal exceeds the testing range of the testing equipment and needs to be attenuated.
The objects, technical solutions and advantages of the present invention have been described in further detail with reference to the preferred embodiments, it should be understood that the above description is only illustrative of the preferred embodiments of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A test system for rf time template parameters, the test system comprising a transmitter for generating a synchronization signal and a signal under test, and an rf spectrometer for performing a time template parameter test on the signal under test according to the synchronization signal generated by the transmitter, the test system further comprising: a synchronous variable radio frequency attenuator connected between the transmitter and the radio frequency spectrometer, and a compensator connected to an output of the radio frequency spectrometer,
and the synchronous variable radio frequency attenuator is used for attenuating the measured signal generated by the transmitter according to a preset attenuation amount under the control of the synchronous signal generated by the transmitter so as to enable the radio frequency spectrometer to perform time template parameter test on the attenuated measured signal.
2. The test system of claim 1, wherein the predetermined amount of attenuation is determined based on a nominal test range of the radio frequency spectrometer and power parameters of the transmitter during its transmit and receive time slots.
3. The test system of claim 2, wherein more than one synchronous variable radio frequency attenuator in cascade with each other is connected between the transmitter and the radio frequency spectrometer;
and the total amount of the attenuation of all the synchronous variable radio frequency attenuators to the test signal is equal to the preset attenuation amount.
4. The test system of any one of claims 2 or 3, wherein the preset amount of attenuation comprises a transmit slot attenuation amount and a receive slot attenuation amount, the synchronous variable radio frequency attenuator comprising: a first single-input dual-output selection switch, a second RF attenuator attenuated according to the attenuation amount of the transmitting time slot, a third RF attenuator attenuated according to the attenuation amount of the receiving time slot, and a synchronous control signal generator,
one input of the first single-input double-output selection switch is connected with the input end of the synchronous variable radio frequency attenuator, one output of the first single-input double-output selection switch is connected with the input of the second RF attenuator, and the other output of the first single-input double-output selection switch is connected with the input of the third RF attenuator;
the output of the second RF attenuator and the output of the third RF attenuator are both connected with the output end of the synchronous variable radio frequency attenuator;
the synchronous control signal generator is used for triggering one input of the first single-input double-output selection switch to be conducted with one output when a synchronous signal generated by the transmitter represents a transmission time slot; and when the synchronous signal generated by the transmitter represents a receiving time slot, triggering one path of input of the first single-input double-output selection switch to be conducted with the other path of output.
5. The test system of claim 2, wherein one or more than one variable radio frequency attenuator is further connected between the synchronous variable radio frequency attenuator and the radio frequency spectrometer, and is configured to attenuate a signal to be tested output by the synchronous variable radio frequency attenuator by a predetermined attenuation amount;
and the total amount of the attenuation of the synchronous variable radio frequency attenuator and all the variable radio frequency attenuators to the test signal is equal to the preset attenuation amount.
6. The test system of claim 5, wherein the variable radio frequency attenuator comprises: a second single-input dual-output selection switch, a fourth RF attenuator, and a first switching controller,
one input of the second single-input double-output selection switch is connected with the input end of the variable radio frequency attenuator, one output of the second single-input double-output selection switch is connected with the output end of the variable radio frequency attenuator, and the other output of the second single-input double-output selection switch is connected with the input of the fourth radio frequency attenuator;
the output of the fourth RF attenuator is connected with the output end of the variable radio frequency attenuator;
when the receiving time slot of the transmitter comes, the first switching controller triggers one input of the second single-input double-output selection switch to be conducted with one output; and when the transmitting time slot of the transmitter arrives, triggering one path of input of the second single-input double-output selection switch to be conducted with the other path of output.
7. The test system of claim 5, wherein the variable radio frequency attenuator comprises: a third single-input dual-output selection switch, a fifth RF attenuator, a sixth RF attenuator, and a second switching controller,
one input of the third single-input double-output selection switch is connected with the input end of the variable radio frequency attenuator, one output of the third single-input double-output selection switch is connected with the input of the fifth RF attenuator, and the other output of the third single-input double-output selection switch is connected with the input of the sixth RF attenuator;
the output of the fifth RF attenuator is connected with the output end of the variable radio frequency attenuator;
the output of the sixth RF attenuator is connected with the output end of the variable radio frequency attenuator;
when the receiving time slot of the transmitter comes, the second switching controller triggers one input of the third single-input double-output selection switch to be conducted with one output; and when the transmitting time slot of the transmitter arrives, triggering one path of input of the third single-input double-output selection switch to be conducted with the other path of output.
8. The test system of any one of claims 2, or 3, or 5 to 7, wherein at least one first radio frequency RF attenuator is further cascaded between the synchronous variable radio frequency attenuator and the transmitter for pre-attenuating test signals that have not been attenuated by the synchronous variable radio frequency attenuator.
9. The test system of claim 2, wherein the first synchronous variable radio frequency attenuator is provided with a plurality of attenuation levels.
10. The test system of any one of claims 2, or 3, or 5 to 7, further comprising:
and the compensator is used for compensating the time template parameters of the attenuated measured signals output by the radio frequency spectrometer according to the preset attenuation amount to obtain the time template parameters of the measured signals before attenuation.
11. A method of adjusting a test range of a radio frequency time template parameter, the method comprising:
and under the control of the synchronous signal generated by the transmitter, attenuating the measured signal generated by the transmitter according to a preset attenuation amount so as to enable the radio frequency spectrometer to perform time template parameter test on the attenuated measured signal.
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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 |
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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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