CN203537404U - Base-station radio-frequency testing system applicable to LTE (long term evolution) system - Google Patents
Base-station radio-frequency testing system applicable to LTE (long term evolution) system Download PDFInfo
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Abstract
The utility model discloses a base-station radio-frequency testing system applicable to an LTE (long term evolution) system. The base-station radio-frequency testing system is connected with a base station to be tested and is used for testing radio-frequency data of the base station to be tested. The base-station radio-frequency testing system comprises a frequency-spectrum analyzer, a channel simulator, a useful signal generator, an interference signal generator, a broadband signal generator, a power meter, a main control computer and a radio-frequency box. The main control computer is connected with the frequency-spectrum analyzer, the channel simulator, the useful signal generator, the interference signal generator, the broadband signal generator, the power meter and the radio-frequency box. The radio-frequency box is connected with the frequency-spectrum analyzer, the channel simulator, the useful signal generator, the interference signal generator, the broadband signal generator, the power meter and the base station to be tested. The power meter is connected with the broadband signal generator. The radio-frequency box comprises a switch, a load, an isolator, a coupler, an attenuator, a combiner, a multi-frequency combiner and a radio-frequency interface.
Description
Technical Field
The utility model relates to a mobile communication field indicates a basic station radio frequency test system suitable for LTE system especially.
Background
LTE is one of the mainstream technologies of fourth generation mobile communication. Two modes, FDD (frequency division duplex) and TDD (time division duplex), are supported. TD-LTE is a time division duplex LTE system, and LTE-FDD is a frequency division duplex LTE system. Currently, commercialization of the LTE system is receiving the most widespread attention from global operators and equipment vendors. Therefore, the performance of the base station device as an important network element in the communication network determines the quality of the whole system.
In the prior art, the system for testing the base station radio frequency of the LTE system is complex to build, artificial unnecessary errors are easily introduced when the test system is manually built, and the reliability of the system is reduced. The radio frequency switch is an important device in a radio frequency test system, and common radio frequency switches are divided into two types: the method comprises the steps of (1) having a feedback mechanism and not having the feedback mechanism; both types of switches introduce the safety problem of the radio frequency automatic test system of the high-power equipment, and reduce the robustness of the test system. In a common automatic test system, an instrument control instruction is only suitable for an instrument of a certain type, and the flexibility of the test system is not high.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to above problem, test the basic station from the angle of radio frequency transmission and receipt, cover most test item of the basic station of LTE system, guaranteed communication system's wholeness ability, realize that an degree of automation is high, measuring result is accurate, realize simple LTE system's basic station radio frequency test system.
In order to achieve the above object, the utility model provides a basic station radio frequency test system suitable for LTE system connects the basic station that awaits measuring, is used for the test the radio frequency data of basic station that awaits measuring, the system includes: the system comprises a spectrum analyzer, a channel simulator, a useful signal generator, an interference signal generator, a broadband signal generator, a power meter, a main control computer and a radio frequency box; the main control computer is connected with the spectrum analyzer, the channel simulator, the useful signal generator, the interference signal generator, the broadband signal generator, the power meter and the radio frequency box; the radio frequency box is connected with the spectrum analyzer, the channel simulator, the useful signal generator, the interference signal generator, the broadband signal generator, the power meter and the base station to be tested; the power meter is connected with the broadband signal generator; the channel simulator is used for simulating a multipath fading channel of mobile communication; the useful signal generator is used for generating a useful signal; the interference signal generator is used for generating an interference signal; the broadband signal generator is used for generating a broadband signal; the power meter is used for testing the power of the broadband signal; the radio frequency box includes: the device comprises a switch, a load, a one-way device, a coupler, an attenuator, a combiner, a multi-frequency combiner and a radio frequency interface; the switch is connected with the load, the isolator, the coupler attenuator, the combiner, the multi-frequency combiner and the radio frequency interface and is used for switching a test path; the radio frequency interface is used for connecting the base station to be tested, the spectrum analyzer, the channel simulator, the useful signal generator, the interference signal generator, the broadband signal generator and the power meter; the spectrum analyzer is used for testing the radio frequency data of the base station to be tested and displaying a test result; and the main control computer is used for controlling the switch of the radio frequency box, the spectrum analyzer, the channel simulator, the useful signal generator, the interference signal generator, the broadband signal generator and the power meter, and is used for controlling the test flow and displaying the test result.
Further, the conventional test rf box includes: the radio frequency unit comprises a first radio frequency interface, a second radio frequency interface, a third radio frequency interface, a 6dB coupler, a 6dB attenuator, a 10dB attenuator, a 20dB attenuator, a 30dB attenuator, a 40dB attenuator, a first isolator, a second isolator, a first switch, a second switch, a third switch, a fourth switch and two loads; the first radio frequency interface is connected with an input end of the 6dB coupler, a through output end of the 6dB coupler is connected with one end of the 6dB attenuator, the other end of the 6dB attenuator is connected with a moving end of the first switch, the first switch and the second switch respectively comprise at least 5 fixed ends, each pair of corresponding fixed ends between the first switch and the second switch is respectively connected with a 40dB attenuator, a 30dB attenuator, a 20dB attenuator, a 10dB attenuator and a jumper, and a moving end of the second switch is connected with the second radio frequency interface; the third radio frequency interface is connected with a movable end of the third switch, the third switch and the fourth switch respectively comprise 4 immovable ends, a first immovable end of the third switch is connected with an input end of the first isolator, a first immovable end of the fourth switch is connected with an output end of the first isolator, a second immovable end of the third switch is connected with an input end of the second isolator, a second immovable end of the fourth switch is connected with an output end of the second isolator, a third immovable end of the third switch is connected with a third immovable end of the fourth switch through a jumper wire, a fourth immovable end of the third switch is connected with a load, a fourth immovable end of the fourth switch is connected with another load, and a movable end of the fourth switch is connected with a coupling end of the 6dB coupler.
Further, the conventional test rf box further includes: a fourth radio frequency interface, a fifth radio frequency interface, a sixth radio frequency interface, a seventh radio frequency interface, an eighth radio frequency interface, a third isolator, a fourth isolator, a fifth isolator, a sixth isolator, a fifth switch, a sixth switch and a combiner; the fourth radio frequency interface is connected to the input end of the third isolator, the output end of the third isolator is connected to one immobile end of the fifth switch, the fifth radio frequency interface is connected to the input end of the fourth isolator, the output end of the fourth isolator is connected to the other immobile end of the fifth switch, the sixth radio frequency interface is connected to the input end of the fifth isolator, the output end of the fifth isolator is connected to one immobile end of the sixth switch, the seventh radio frequency interface is connected to the input end of the sixth isolator, the output end of the sixth isolator is connected to the other immobile end of the sixth switch, the mobile end of the fifth switch and the mobile end of the sixth switch are connected to the input end of the combiner, and the output end of the combiner is connected to the eighth radio frequency interface.
Further, the first isolator, the third isolator and the fifth isolator are isolators with a frequency band of 800-; the second isolator, the fourth isolator and the sixth isolator are isolators with the frequency range of 1710 and 2700 MHz.
Further, the rf box further includes: stray test radio frequency boxes; wherein, stray test radio frequency case includes: a first switch of a stray box, a second switch of the stray box, a third switch of the stray box, a fourth switch of the stray box, a fifth switch of the stray box, a first multi-frequency combiner, a second multi-frequency combiner, a third multi-frequency combiner, a fourth multi-frequency combiner, a first coupler, a second coupler, a first load, a second load, an expansion interface, a signal input interface and a signal output interface; the signal input interface is connected with the first coupler and the second coupler; the first switch of the stray box is connected with the second coupler and selectively connected with one of the second switch of the stray box, the third switch of the stray box and the third multi-frequency combiner; the second switch of the stray box is selectively connected with one of the first multi-frequency combiner, the second multi-frequency combiner and the third multi-frequency combiner; the stray box third switch is selectively connected with one of the first load, the fourth multi-frequency combiner and the expansion interface; the fourth switch of the stray box is connected with the signal output interface and selectively connected with one of the first multi-frequency combiner, the second multi-frequency combiner, the third multi-frequency combiner, the fifth switch of the stray box and the expansion interface; and the stray box fifth switch is selectively connected with one of the second load and the fourth multi-frequency combiner.
Further, the radio frequency data includes: maximum output power, occupied bandwidth, frequency error, error vector amplitude, adjacent channel leakage ratio, total power dynamic range, downlink reference signal power, receiver sensitivity level, dynamic range, receiver stray data, PUSCH performance under multipath fading propagation conditions, performance requirements for uplink timing adjustment, performance requirements for HARQ-ACK multiplexing on PUSCH, PRACH false alarm probability and missed detection rate.
The utility model provides a basic station radio frequency test system suitable for LTE system, this test system build simply, and it is convenient to use, can be suitable for multiple mainstream spectral analysis appearance to realized earlier the affirmation to switching position in the test system when the test, effectively protected test link and test instrument, improved test system's robustness.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural diagram of a base station radio frequency test system suitable for an LTE system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a conventional test rf box according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a spurious measurement rf box according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a test system for performing a conventional test on a transmitter according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a test system for testing a transmitter in a special frequency band in accordance with an embodiment of the present invention.
FIG. 6 is a schematic diagram of the RF box connection and switch initial position of the embodiment of FIG. 5.
Detailed Description
The following description of the preferred embodiments of the present invention will be made in conjunction with the drawings and the accompanying drawings to further illustrate the technical means adopted to achieve the objects of the present invention.
Fig. 1 is a schematic structural diagram of a base station radio frequency test system suitable for an LTE system according to an embodiment of the present invention. The test system is used for testing the radio frequency data of the base station to be tested, as shown in fig. 1, the test system is connected with the base station 9 to be tested, and the test system includes: the device comprises a radio frequency box 1, a channel simulator 2, a spectrum analyzer 3, a useful signal generator 4, an interference signal generator 5, a broadband signal generator 6, a power meter 7 and a main control computer 8. Wherein,
the main control computer 8 is connected with the radio frequency box 1, the channel simulator 2, the spectrum analyzer 3, the useful signal generator 4, the interference signal generator 5, the broadband signal generator 6 and the power meter 7; the radio frequency box 1 is connected with a channel simulator 2, a spectrum analyzer 3, a useful signal generator 4, an interference signal generator 5, a broadband signal generator 6, a power meter 7 and the base station to be tested 9; the power meter 7 is connected to the broadband signal generator 6. Wherein,
and the channel simulator 2 is used for simulating a multipath fading channel of mobile communication.
A useful signal generator 4 for generating a useful signal, which can be used as a useful signal source.
And the interference signal generator 5 is used for generating an interference signal and can be used as an interference signal source.
And the broadband signal generator 6 is used for generating a broadband signal and can be used as a broadband signal source.
And the power meter 7 is used for testing the power of the broadband signal.
The radio frequency box 1 includes: the device comprises a switch, a load, a one-way device, a coupler, an attenuator, a combiner, a multi-frequency combiner and a radio frequency interface; the switch is connected with the load, the isolator, the coupler attenuator, the combiner, the multi-frequency combiner and the radio frequency interface and is used for switching a test path; the radio frequency interface is used for connecting a base station to be tested or the aforementioned testing equipment, such as the channel simulator 2, the spectrum analyzer 3, the useful signal generator 4, the interference signal generator 5, the broadband signal generator 6 and the power meter 7.
And the spectrum analyzer 3 is used for testing the radio frequency data of the base station 9 to be tested and displaying the test result.
And the main control computer 8 is used for controlling the switch of the radio frequency box, the spectrum analyzer, the channel simulator, the useful signal generator, the interference signal generator, the broadband signal generator and the power meter, and is used for controlling the test flow and displaying the test result.
The utility model discloses a test system builds simply, and testable data content is abundant, mainly can be used to measure maximum output power, occupy bandwidth, frequency error, error vector amplitude, adjacent channel leakage ratio, total power dynamic range, down reference signal power, receiver sensitivity level, dynamic range, receiver spurious data, the PUSCH performance under the multipath fading propagation condition, the performance requirement of uplink timing adjustment, the multiplexed performance requirement of HARQ-ACK on the PUSCH, data such as PRACH false alarm probability and missed measure rate.
Fig. 2 is a schematic structural diagram of a conventional test rf box according to an embodiment of the present invention. As shown in fig. 2, the radio frequency box 1 includes a conventional test radio frequency box; wherein, conventional test radio frequency case includes:
a first radio frequency interface 101, a 6dB coupler 102, a 6dB attenuator 103, a first switch 104, a 40dB attenuator 105, a 30dB attenuator 106, a 20dB attenuator 107, a 10dB attenuator 108, a second switch 109, a second radio frequency interface 110, a third radio frequency interface 111, a third switch 112, two loads 113, a first isolator 114, a second isolator 115, a fourth switch 116; wherein,
the first radio frequency interface 101 is connected with the input end of the 6dB coupler 102, the through output end of the 6dB coupler 102 is connected with one end of the 6dB attenuator 103, the other end of the 6dB attenuator 103 is connected with the movable end of the first switch 104, the first switch 104 and the second switch 109 respectively comprise at least 5 immovable ends, each pair of corresponding immovable ends between the first switch 104 and the second switch 109 are respectively connected with the 40dB attenuator 105, the 30dB attenuator 106, the 20dB attenuator 107, the 10dB attenuator 108 and a jumper, and the movable end of the second switch 109 is connected with the second radio frequency interface 110;
the third rf interface 111 is connected to the moving end of the third switch 112, the third switch 112 and the fourth switch 116 respectively include 4 fixed ends, the first fixed end of the third switch 114 is connected to the input end of the first isolator 114, the first fixed end of the fourth switch 116 is connected to the output end of the first isolator 114, the second fixed end of the third switch 112 is connected to the input end of the second isolator 115, the second fixed end of the fourth switch 116 is connected to the output end of the second isolator 115, the third fixed end of the third switch 112 is connected to the third fixed end of the fourth switch 116 through a jumper, the fourth fixed end of the third switch 112 is connected to a load 113, the fourth fixed end of the fourth switch 116 is connected to another load 113, and the moving end of the fourth switch 116 is connected to the coupling end of the 6dB coupler 102.
In this embodiment, the conventional test rf box further includes: a fourth radio frequency interface 117, a fifth radio frequency interface 118, a sixth radio frequency interface 119, a seventh radio frequency interface 120, a third isolator 121, a fourth isolator 122, a fifth isolator 123, a sixth isolator 124, a fifth switch 125, a sixth switch 126, a combiner 127, and an eighth radio frequency interface 128; wherein,
the fourth rf interface 117 is connected to the input end of the third isolator 121, the output end of the third isolator 121 is connected to a fixed end of the fifth switch 125, the fifth rf interface 118 is connected to the input end of the fourth isolator 122, the output end of the fourth isolator 122 is connected to the other fixed end of the fifth switch 125, the sixth rf interface 119 is connected to the input end of the fifth isolator 123, the output end of the fifth isolator 123 is connected to a fixed end of the sixth switch 1266, the seventh rf interface 120 is connected to the input end of the sixth isolator 124, the output end of the sixth isolator 124 is connected to the other fixed end of the sixth switch 126, the movable end of the fifth switch 125 and the movable end of the sixth switch 126 are connected to the input end of the combiner 127, and the output end of the combiner 127 is connected to the eighth rf interface 128.
Wherein, the first isolator 114, the third isolator 121 and the fifth isolator 123 are isolators with frequency band of 800-; the second, fourth and sixth isolators 115, 122 and 124 are isolators in the 1710 and 2700MHz band; the frequency band of the combiner 127 is 700M-2.7 GHz.
Fig. 3 is a schematic structural diagram of a spurious measurement rf box according to an embodiment of the present invention. As shown in fig. 3, the rf box further includes: stray test radio frequency boxes; wherein, stray test radio frequency case includes:
a signal input interface 140a, a signal input interface 140b, a signal input interface 140c, a first coupler 141, a second coupler 142, a first switch 143 of a stray box, a second switch 144 of the stray box, a third switch 145 of the stray box, a first multi-frequency combiner 146, a second multi-frequency combiner 147, a third multi-frequency combiner 148, a fourth switch 149 of the stray box, a first load 150, a second load 151, a fourth multi-frequency combiner 152, an expansion interface 153, a fifth switch 154 of the stray box, and a signal output interface 155; wherein,
the first coupler 141 is a 20dB coupler, the second coupler 142 is a 10dB coupler, the output ends of the two couplers are connected, and the signal input interface 140a is connected to the coupling end of the second coupler 142; the signal input interface 140b is connected to the input terminal of the first coupler 141, and the signal input interface 140c is connected to the coupling terminal of the first port 141.
A first switch 143 of the stray box connected to the input terminal of the second coupler 142 and selectively connected to one of the second switch 144 of the stray box, the third switch 145 of the stray box, and the third multi-frequency combiner 148;
a second switch 144 of the stray box selectively connected to one of the first multi-frequency combiner 146, the second multi-frequency combiner 147 and the third multi-frequency combiner 148;
a spur tank third switch 145 selectively connected to one of the first load 150, the fourth multi-frequency combiner 152, and the expansion interface 153;
a fourth switch 149 of the spur tank, connected to the signal output interface 155, and selectively connected to one of the first multi-frequency combiner 146, the second multi-frequency combiner 147, the third multi-frequency combiner 148, the fifth switch 154 of the spur tank, and the expansion interface 153;
the spur tank fifth switch 154 is selectively connected to one of the second load 151 and the fourth multi-frequency combiner 152.
In the present embodiment, the first multi-frequency combiner 146 includes four frequency bands: 880-915MHz, 825-835MHz, 1710-1785MHz and 1920-1980 MHz.
The second multi-frequency combiner 147 includes: 870-880MHz, 921-960MHz, 1805-1880MHz, 2010-2030MHz and 2110-2170 MHz.
The third multi-frequency combiner 148 includes: 700-820MHz, 851-866MHz, 1785-1805MHz, 1880-1920MHz (F-band), and 2170-2300 MHz.
The fourth multi-frequency combiner 152 includes: 2300 + 2400MHz (E band), 2570 + 2620MHz (D band).
The following describes steps and effects of actual testing by using the testing system of the present invention with an embodiment. Fig. 4 is a schematic structural diagram of a test system for performing a conventional test on a transmitter according to an embodiment of the present invention. As shown in the figure, when a transmitter is normally tested, the radio frequency box 1 is a normal test radio frequency box, and a spectrum analyzer 3, a useful signal generator 4, a broadband signal generator 6, a power meter 7 and a main control computer 8 are also used; wherein, the testing step comprises:
step S401, calibrating a test path. Firstly, connecting a broadband signal generator 6 with a first radio frequency interface 101 of a conventional test radio frequency box, connecting a spectrum analyzer 3 with a second radio frequency interface 110, and connecting a fourth switch 116 with a load; the broadband signal generator 6 sends out signals, the main control computer 8 is utilized to control the first switch 104 and the second switch 109 to be respectively arranged at the positions of the 40dB attenuator 105, the 30dB attenuator 106, the 20dB attenuator 107 and the 10dB attenuator 108, the reading of the power meter 7 and the reading of the spectrum analyzer 3 are respectively recorded, and the insertion loss value of a test access is obtained;
step S402, testing path confirmation. Connecting an antenna port of a base station 9 to be tested to a first radio frequency interface 101 of a conventional test radio frequency box, connecting a spectrum analyzer 3 to a second radio frequency interface 110, connecting a useful signal generator 4 to a third radio frequency interface 111, and adjusting a third switch 112 and a fourth switch 116 to be in jumper connection; according to the rated output power of the base station 9 to be tested, a useful signal generator 4 is used for sending a signal of a selected frequency point, and a spectrum analyzer 3 reads the signal of the selected frequency point and judges whether a test path is correct or not;
and step S403, testing the performance of the transmitter. And calling an LTE plug-in of the spectrum analyzer 3 to test data such as transmitting power, occupied bandwidth, total power dynamic range, frequency error, error vector amplitude, adjacent channel leakage ratio, total power dynamic range, downlink reference signal power and the like of the base station 9 to be tested.
Because the base station 9 to be tested belongs to a high-power output device, the spectrum analyzer 3 has a requirement on the size of the input signal (the size of the input signal needs to be limited to protect a front-end attenuator) so as to prevent the spectrum analyzer 3 from being damaged by the misplacement of a switch position. Before the base station 9 to be tested is loaded with power, the switch position needs to be confirmed first (step S402 described above) to confirm that the attenuator between the first switch 104 and the second switch 109 is set at the desired position. And when the switch position is determined to be correct, loading the output full power of the base station 9 to be tested, and testing the test items.
Through above specific implementation mode, in actual test, this system can both be incorporated to the mainstream spectrum analysis appearance (N9020A and FSQ26) of mainstream producer (Agilent company and RS company) on the market the utility model discloses an in the system, realized the mapping between the instruction of the different instruments of same user's demand, improved test system's flexibility.
Fig. 5 is a schematic structural diagram of a test system for testing a transmitter in a special frequency band in accordance with an embodiment of the present invention. FIG. 6 is a schematic diagram of the RF box connection and switch initial position of the embodiment of FIG. 5. As shown in fig. 5 and fig. 6, taking the testing of the spurious signals in the specific frequency band of 880MHz to 915MHz as an example, the used rf boxes 1 are a conventional testing rf box and a spurious testing rf box, and further, a spectrum analyzer 3, a useful signal generator 4, a broadband signal generator 6, a power meter 7 and a main control computer 8 are used; wherein, the testing step comprises:
step S501, calibration of a transmitter test path of the special frequency band stray. Firstly, a first radio frequency interface 101 of a conventional test radio frequency box is connected with a useful signal generator 4, a second radio frequency interface 110 is connected with a signal input interface 140b of a stray test radio frequency box, a signal output interface 155 of the stray test radio frequency box is connected with a spectrum analyzer 3, and other interfaces of the two radio frequency boxes are connected with loads; the first switch 104 and the second switch 109 in the conventional test radio frequency box are adjusted to be connected by a jumper wire by using the main control computer 8, and the fourth switch 116 is adjusted to be connected with a load; the first switch 143 of the stray box is adjusted to be connected to the second switch 144 of the stray box, the second switch 144 of the stray box is adjusted to be connected to the 880-815MHz term of the first multi-frequency combiner 146, and the fourth switch 149 of the stray box is adjusted to be connected to the first multi-frequency combiner 146. The frequency band of the useful signal generator 4 and the frequency band of the spectrum analyzer 3 are 880-915MHz, the useful signal source is opened, and the insertion loss value is measured and recorded by the spectrum analyzer 3.
In step S501, the insertion loss values of other frequency bands can be measured by adjusting the switches of the spurious test rf box, and the frequency bands of the useful signal generator 4 and the spectrum analyzer 3.
Step S502, the confirmation of the special frequency band stray transmitter test path. Firstly, an antenna port of a base station 9 to be tested is connected to a first radio frequency interface 101 of a conventional test radio frequency box, a second radio frequency interface 110 is connected with a signal input interface 140b of a stray test radio frequency box, a signal input interface 140a is connected with a broadband signal generator 6, a signal input interface 140c is connected with a power meter 7, a signal output interface 155 is connected with a spectrum analyzer 3, and other interfaces are connected with loads; and adjusting switches of a conventional test radio frequency box and a spurious test radio frequency box, and reading numerical values of the spectrum analyzer 3 and the power meter 7 to judge whether a spurious transmitter test path of the special frequency band is correct.
Step S503, the transmitter spur data is tested. Setting the frequency range of the spectrum analyzer 3 to 880-915MHz, setting parameters such as RBW and the like according to the standard requirement, reading the highest stray value and completing the test.
In step S502 of this embodiment, the specific test path confirmation steps are as follows:
step S502a, setting the switches of the rf box at the initial positions (connecting the respective first fixed ends) as shown in fig. 6, prompting the manufacturer engineer to be tested to set the base station 9 to be tested to transmit signals in a specified format at the connected antenna port according to the requirements of the test specification. And reading the value of the power meter 7, detecting whether the value is in a proper range, continuing to execute the next step if the value is in a reasonable range, and prompting that the conventional test radio frequency box is set wrongly if the value is out of the range.
Step 502b, for the F-band device, the stationary ends of the first, second, third, fourth and fifth switches 143, 144, 145, 149 and 154 of the stray scattering frequency box may be sequentially adjusted to positions 5, 1, 3 and 1; for E-band equipment, the switches of the heteroscattering frequency box can be sequentially adjusted to be at positions 1, 2, 4 and 2; for D-band equipment, the switches of the heteroscattering frequency box can be sequentially adjusted to be at positions 1, 3, 4 and 2; test pattern verification is then performed on the spectrum analyzer 3, and it is verified whether the signal emitted in step S502a meets the specification in the standard, based on the test standard.
In step S502c, the first switch 143 of the stray box for adjusting the stray test rf box is connected to the second switch 144 of the stray box, and the other switches are all at the initial positions (connected to the respective first fixed ends). Sending a 0dBm900MHz signal by using a broadband signal generator 6, setting the center frequency of 900MHz, the bandwidth of 1MHz, RBW =30KHz, the detection mode RMS, reading the power P, and then closing the output of a signal source; and judging whether the P is within a reasonable range, if so, continuing to execute the next step, and otherwise, prompting that the switch or the connection of the stray radio frequency box is abnormal.
Step S502d, adjusting the first switch 104 and the second switch 105 of the conventional test rf box to be in jumper connection, reading the value of the power meter 7, determining whether the value is within a proper range, if so, performing the stray data test in step S503, and if not, prompting that the switch of the conventional test rf box is set up incorrectly.
In this embodiment, after the testing of the spur data of one frequency band is finished, if the spurs of other frequency bands need to be tested, the steps S502a to S502d need to be executed again to confirm the path again.
Through the scheme, the secondary confirmation of the switch position in the test system is realized, and the possibility that the test link and the test instrument are damaged if the switch position in the system is mistaken or misplaced due to the fact that the output power of the base station equipment is large is prevented. After the switch position is confirmed, the system prompts the output power of the base station to be tested to be turned on, thereby protecting the test link and instruments.
The utility model provides a basic station radio frequency test system suitable for LTE system, this test system build simply, and it is convenient to use, can be suitable for multiple mainstream spectral analysis appearance to realized earlier the affirmation to switching position in the test system when the test, effectively protected test link and test instrument, improved test system's robustness.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A base station radio frequency test system suitable for LTE system connects the base station that awaits measuring for the test the radio frequency data of the base station that awaits measuring, its characterized in that, the system includes: the system comprises a spectrum analyzer, a channel simulator, a useful signal generator, an interference signal generator, a broadband signal generator, a power meter, a main control computer and a radio frequency box; wherein,
the main control computer is connected with the spectrum analyzer, the channel simulator, the useful signal generator, the interference signal generator, the broadband signal generator, the power meter and the radio frequency box; the radio frequency box is connected with the spectrum analyzer, the channel simulator, the useful signal generator, the interference signal generator, the broadband signal generator, the power meter and the base station to be tested; the power meter is connected with the broadband signal generator; wherein,
the channel simulator is used for simulating a multipath fading channel of mobile communication;
the useful signal generator is used for generating a useful signal;
the interference signal generator is used for generating an interference signal;
the broadband signal generator is used for generating a broadband signal;
the power meter is used for testing the power of the broadband signal;
the radio frequency box includes: the device comprises a switch, a load, a one-way device, a coupler, an attenuator, a combiner, a multi-frequency combiner and a radio frequency interface; wherein,
the switch is connected with the load, the isolator, the coupler attenuator, the combiner, the multi-frequency combiner and the radio frequency interface and is used for switching a test path;
the radio frequency interface is used for connecting the base station to be tested, the spectrum analyzer, the channel simulator, the useful signal generator, the interference signal generator, the broadband signal generator and the power meter;
the spectrum analyzer is used for testing the radio frequency data of the base station to be tested and displaying a test result;
and the main control computer is used for controlling the switch of the radio frequency box, the spectrum analyzer, the channel simulator, the useful signal generator, the interference signal generator, the broadband signal generator and the power meter, and is used for controlling the test flow and displaying the test result.
2. The test system of claim 1, wherein the radio frequency cabinet comprises: testing the radio frequency box conventionally; wherein, conventional test radio frequency case includes:
the radio frequency unit comprises a first radio frequency interface, a second radio frequency interface, a third radio frequency interface, a 6dB coupler, a 6dB attenuator, a 10dB attenuator, a 20dB attenuator, a 30dB attenuator, a 40dB attenuator, a first isolator, a second isolator, a first switch, a second switch, a third switch, a fourth switch and two loads; wherein,
the first radio frequency interface is connected with the input end of the 6dB coupler, the through output end of the 6dB coupler is connected with one end of the 6dB attenuator, the other end of the 6dB attenuator is connected with the movable end of the first switch, the first switch and the second switch respectively comprise at least 5 immovable ends, each pair of corresponding immovable ends between the first switch and the second switch is respectively connected with a 40dB attenuator, a 30dB attenuator, a 20dB attenuator, a 10dB attenuator and a jumper, and the movable end of the second switch is connected with the second radio frequency interface;
the third radio frequency interface is connected with a movable end of the third switch, the third switch and the fourth switch respectively comprise 4 immovable ends, a first immovable end of the third switch is connected with an input end of the first isolator, a first immovable end of the fourth switch is connected with an output end of the first isolator, a second immovable end of the third switch is connected with an input end of the second isolator, a second immovable end of the fourth switch is connected with an output end of the second isolator, a third immovable end of the third switch is connected with a third immovable end of the fourth switch through a jumper wire, a fourth immovable end of the third switch is connected with a load, a fourth immovable end of the fourth switch is connected with another load, and a movable end of the fourth switch is connected with a coupling end of the 6dB coupler.
3. The test system of claim 2, wherein the conventional test radio frequency case further comprises: a fourth radio frequency interface, a fifth radio frequency interface, a sixth radio frequency interface, a seventh radio frequency interface, an eighth radio frequency interface, a third isolator, a fourth isolator, a fifth isolator, a sixth isolator, a fifth switch, a sixth switch and a combiner; wherein,
the fourth radio frequency interface is connected with the input end of the third isolator, the output end of the third isolator is connected with one immobile end of the fifth switch, the fifth radio frequency interface is connected with the input end of the fourth isolator, the output end of the fourth isolator is connected with the other immobile end of the fifth switch, the sixth radio frequency interface is connected with the input end of the fifth isolator, the output end of the fifth isolator is connected with one immobile end of the sixth switch, the seventh radio frequency interface is connected with the input end of the sixth isolator, the output end of the sixth isolator is connected with the other immobile end of the sixth switch, the mobile end of the fifth switch and the mobile end of the sixth switch are connected with the input end of the combiner, and the output end of the combiner is connected with the eighth radio frequency interface.
4. The testing system of claim 3, wherein the first, third and fifth isolators are isolators within the frequency range of 800-1000 MHz;
the second isolator, the fourth isolator and the sixth isolator are isolators with the frequency range of 1710 and 2700 MHz.
5. The test system of claim 4, wherein the radio frequency cabinet further comprises: stray test radio frequency boxes; wherein, stray test radio frequency case includes:
a first switch of a stray box, a second switch of the stray box, a third switch of the stray box, a fourth switch of the stray box, a fifth switch of the stray box, a first multi-frequency combiner, a second multi-frequency combiner, a third multi-frequency combiner, a fourth multi-frequency combiner, a first coupler, a second coupler, a first load, a second load, an expansion interface, a signal input interface and a signal output interface; wherein,
the signal input interface is connected with the first coupler and the second coupler;
the first switch of the stray box is connected with the second coupler and selectively connected with one of the second switch of the stray box, the third switch of the stray box and the third multi-frequency combiner;
the second switch of the stray box is selectively connected with one of the first multi-frequency combiner, the second multi-frequency combiner and the third multi-frequency combiner;
the stray box third switch is selectively connected with one of the first load, the fourth multi-frequency combiner and the expansion interface;
the fourth switch of the stray box is connected with the signal output interface and selectively connected with one of the first multi-frequency combiner, the second multi-frequency combiner, the third multi-frequency combiner, the fifth switch of the stray box and the expansion interface;
and the stray box fifth switch is selectively connected with one of the second load and the fourth multi-frequency combiner.
6. The test system of claim 1, wherein the radio frequency data comprises: maximum output power, occupied bandwidth, frequency error, error vector amplitude, adjacent channel leakage ratio, total power dynamic range, downlink reference signal power, receiver sensitivity level, dynamic range, receiver stray data, PUSCH performance under multipath fading propagation conditions, performance requirements for uplink timing adjustment, performance requirements for HARQ-ACK multiplexing on PUSCH, PRACH false alarm probability and missed detection rate.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532646A (en) * | 2013-10-12 | 2014-01-22 | 工业和信息化部电信传输研究所 | Base-station radio-frequency testing system applicable to LTE (Long Term Evolution) system and testing method |
| CN105406930A (en) * | 2015-12-07 | 2016-03-16 | 北京星河亮点技术股份有限公司 | Multichannel channel emulator, terminal conformance test system and phase calibration system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532646A (en) * | 2013-10-12 | 2014-01-22 | 工业和信息化部电信传输研究所 | Base-station radio-frequency testing system applicable to LTE (Long Term Evolution) system and testing method |
| CN103532646B (en) * | 2013-10-12 | 2017-02-22 | 工业和信息化部电信传输研究所 | Testing method for base-station radio-frequency testing system applicable to LTE (Long Term Evolution) system |
| CN105406930A (en) * | 2015-12-07 | 2016-03-16 | 北京星河亮点技术股份有限公司 | Multichannel channel emulator, terminal conformance test system and phase calibration system |
| CN105406930B (en) * | 2015-12-07 | 2018-01-16 | 北京星河亮点技术股份有限公司 | Multichannel channel simulator, terminal consistency test system and phase alignment system |
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