CN111162848A - Multichannel radio frequency test system - Google Patents
Multichannel radio frequency test system Download PDFInfo
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- CN111162848A CN111162848A CN201811320800.6A CN201811320800A CN111162848A CN 111162848 A CN111162848 A CN 111162848A CN 201811320800 A CN201811320800 A CN 201811320800A CN 111162848 A CN111162848 A CN 111162848A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/29—Performance testing
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Abstract
The invention provides a multi-channel radio frequency test system. The system comprises: the device comprises a plurality of radio frequency channels, a combiner and a frequency spectrograph, wherein each radio frequency channel is configured to input a corresponding radio frequency signal to the combiner; the combiner is configured to receive each radio frequency signal, record frequency point information corresponding to each radio frequency signal, perform synthesis processing on each radio frequency signal, synthesize each radio frequency signal into a target signal, and output the target signal and each frequency point information to the spectrometer; the frequency spectrograph is configured to receive and display the target signal and the frequency point information, and perform performance test on the radio frequency channels according to the frequency point information and the target signal. The invention can improve the testing efficiency of the performance test of the radio frequency channel, does not need manual participation and saves manpower and material resources.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a multi-channel radio frequency test system.
Background
With the rapid development of communication technology, large-scale multi-channel base station products gradually become mainstream. The multi-channel technology (MIMO, Multiple-Input Multiple-Output) has formed a basic consensus in the industry, and compared with single-channel and dual-channel applied in large scale in the past, the MIMO technology with more than 8 channels has a very obvious effect on improving the utilization rate, and will be a key technology for 5G scale application.
The base station products are core devices in the mobile communication network, and the quality of signals sent by the radio frequency channel is an important basis for verifying the function and performance of the base station. In the process of moving from 4G to 5G, multi-channel base station products with more than 8 channels gradually become mainstream. As the number of radio frequency channels increases, the production verification process of the base station product tends to be complicated. At present, downlink signal detection methods of multi-channel base station products mainly include the following two types:
1. and switching the radio frequency test channel manually. This is a relatively primitive test approach that is often used for early base station products with a low number of channels. In the testing process, the radio frequency channel 1 is externally connected with a radio frequency line and a load and is connected with a frequency spectrograph, the downlink signal of the channel 1 is read and analyzed, then the channel 2 is manually switched, and the like.
2. For a multi-channel base station product, an automatic test platform is established by utilizing a radio frequency switch box and automatic test software. The specific method comprises the following steps: and a radio frequency line is led out from each radio frequency channel, is connected with a load and a switch box, is accessed into a frequency spectrograph or a signal source through the switch box, is controlled by automatic test software on a test computer to switch the radio frequency channels, and sequentially verifies the uplink and downlink indexes of each radio frequency channel.
According to the scheme 1, only the radio frequency index of one radio frequency channel can be verified at one time, the overall transmission signal quality of a multi-channel base station product cannot be rapidly measured, the working efficiency is low, a large amount of manpower and material resources are consumed, and the fast-paced and large-batch production and verification tasks cannot be met. In the scheme 2, the automatic test platform is built by using automatic test software, corresponding software programming work is required, only the radio frequency index of one radio frequency channel can be verified at one time, the overall transmission signal quality of a multi-channel base station product cannot be quickly measured, and the test efficiency is low.
Disclosure of Invention
The invention provides a multi-channel radio frequency testing system, which aims to solve the problems of low testing efficiency and waste of manpower and material resources of a radio frequency channel testing method in the prior art.
In order to solve the above problems, the present invention discloses a multi-channel radio frequency testing system, which includes a plurality of radio frequency channels, a combiner, and a spectrometer, wherein each radio frequency channel is configured to input a corresponding radio frequency signal to the combiner; the combiner is configured to receive each radio frequency signal, record frequency point information corresponding to each radio frequency signal, perform synthesis processing on each radio frequency signal, synthesize each radio frequency signal into a target signal, and output the target signal and each frequency point information to the spectrometer; the frequency spectrograph is configured to receive and display the target signal and the frequency point information, and perform performance test on the radio frequency channels according to the frequency point information and the target signal.
Preferably, the system further comprises a first controller, and at least one first program-controlled switch is arranged between each radio frequency channel and the combiner; the first controller configured to control opening/closing of the first programmable switch.
Preferably, a first load is further disposed between each of the radio frequency channels and the combiner; each first load is configured to reduce the power of the radio frequency signal output by the corresponding radio frequency channel.
Preferably, the system further comprises a first attenuator, which is disposed between the combiner and the spectrometer; the first attenuator is configured to reduce the power of the target signal.
Preferably, the system further comprises a frequency conversion module, one end of the frequency conversion module is connected with the radio frequency line externally connected with each radio frequency channel, and the other end of the frequency conversion module is connected with the combiner; the frequency conversion module is configured to perform frequency conversion processing on the radio frequency signals with the same frequency when at least one group of radio frequency signals with the same frequency exists in each radio frequency signal.
In order to solve the above problem, the present invention also discloses a multi-channel rf testing system, comprising: the device comprises a performance detection module, a plurality of radio frequency channels, a power divider and a signal source, wherein the signal source is configured to send a signal to be detected to the power divider; the power divider is configured to receive the signal to be detected, perform shunt processing on the signal to be detected to obtain a plurality of shunt signals with different frequencies, and output corresponding shunt signals to each radio frequency channel; each of the radio frequency channels configured to receive a split signal output by the power splitter; the performance detection module is configured to determine whether each radio frequency channel is in a normal state according to a condition that each radio frequency channel receives a corresponding shunt signal.
Preferably, the system further comprises a second attenuator disposed between the signal source and the power splitter; the second attenuator is configured to reduce the power of the signal to be detected.
Preferably, the system further comprises a plurality of second loads, each second load being disposed between the power divider and each radio frequency channel; the second load is configured to reduce the split signals corresponding to the radio frequency channels by the same amplitude.
Preferably, the system further comprises a second controller, and at least one second programmable switch is arranged between each radio frequency channel and the power divider; the second controller configured to control opening/closing of the second programmable switch.
Compared with the prior art, the invention has the following advantages:
the embodiment of the invention provides a multi-channel radio frequency test system, which synthesizes and processes received radio frequency signals of a plurality of radio frequency channels through a combiner to obtain a path of target signal, outputs the target signal and frequency point information corresponding to each radio frequency signal to a frequency spectrograph for displaying, and tests the performance of each radio frequency channel according to each frequency point information and the target signal. When the embodiment of the invention is used for testing the performance of the multiple radio frequency channels, the radio frequency channels do not need to be switched one by one, so that the testing efficiency of the performance test of the radio frequency channels is improved, manual participation is not needed, and the manpower and material resources are saved.
Drawings
FIG. 1 is a schematic structural diagram of a multi-channel RF test system according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a structure of a combiner according to an embodiment of the present invention;
fig. 3 shows a schematic structural diagram of a multi-channel radio frequency test system according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example one
Referring to fig. 1, a schematic structural diagram of a multi-channel radio frequency test system provided by an embodiment of the invention is shown,
as shown in fig. 1, the multi-channel radio frequency test system may include: a plurality of radio frequency channels 1, a combiner 2 and a spectrometer 3, wherein,
each radio frequency channel 1 can input corresponding radio frequency signals to the combiner 2 respectively;
the combiner 2 can receive the radio frequency signals input by each radio frequency channel 1, record frequency point information corresponding to each radio frequency signal, synthesize each radio frequency signal to synthesize each radio frequency signal into a target signal, and output the target signal and the frequency point information corresponding to each radio frequency signal to the frequency spectrograph 3;
the frequency spectrograph 3 can receive and display the target signal and the frequency point information corresponding to each radio frequency signal, and test the performance of each radio frequency channel 1 according to each frequency point information and the target signal.
In the following, the scheme of the embodiment of the present invention is described in detail. First, the combiner 2 in the embodiment of the present invention will be explained.
Referring to fig. 2, which shows a schematic structural diagram of a combiner according to an embodiment of the present invention, two rf signals 9 may be combined into one output through a power amplifier 10, but the power loss of the two rf signals 9 is half, that is, the insertion loss of the combiner 2, and in the combining process of the two rf signals 9, half of the power amplifier 10 of each path is consumed in the isolation block of the combiner 11.
The insertion loss depends on the amplitude and phase relation of each path of radio frequency signal, taking a two-path Wilkinson power combiner as an example, if the two paths of synthesized input radio frequency signals are same-frequency signals, and the amplitude and the phase are completely equal, the insertion loss is 0; if the phase difference is 180 degrees, the insertion loss is infinite; the theoretical values of the insertion loss for a plurality of radio frequency signals with different frequencies are shown in the following table 1:
table 1:
as shown in table 1, the port number indicates the number of rf signals, and each rf signal is a signal with a different frequency.
In a preferred embodiment of the present invention, the multi-channel radio frequency testing system may further include a first controller 4, and at least one first program-controlled switch 5 is disposed between each radio frequency channel 1 and the combiner 2, as shown in fig. 1, two first program-controlled switches 5 are disposed between the radio frequency channel 1 and the combiner, and certainly, in practical applications, 1, 3, and the like may also be disposed, which is not limited in this embodiment of the present invention.
The first controller 4 may control the on/off of the first program-controlled switch 5, so as to control the radio frequency signals input by each radio frequency channel 1 to the combiner 2, for example, in a multi-channel radio frequency test system, there are 5 preset connected radio frequency channels, which are the radio frequency channel 1, the radio frequency channel 2, the radio frequency channel 3, the radio frequency channel 4, and the radio frequency channel 5, and when only the radio frequency channel 2 and the radio frequency channel 3 need to be tested, the program-controlled switches between the radio frequency channel 2 and the radio frequency channel 3 and the combiner are controlled to be closed by the first controller, that is, the radio frequency channel 2 and the radio frequency channel 3 may input the radio frequency signals to the combiner; and the first controller controls the program-controlled switches among the radio frequency channel 1, the radio frequency channel 4, the radio frequency channel 5 and the combiner to be in an open state, namely the radio frequency channel 1, the radio frequency channel 4 and the radio frequency channel 5 do not input radio frequency signals to the combiner.
It should be understood that the above examples are only examples for better understanding of the technical solutions of the embodiments of the present invention, and are not to be construed as the only limitations of the present invention.
In another preferred embodiment of the present invention, a first load 6 is further preset between each radio frequency channel 1 and the combiner 2, the number of the first loads 6 between each radio frequency channel 1 and the combiner 2 may be 1, or may be 2 (as shown in fig. 1), and the specific number of the first loads 6 between each radio frequency channel 1 and the combiner 2 is not limited in the embodiment of the present invention.
Each first load 6 may be configured to reduce the power of the radio frequency signal output by each radio frequency channel 1, so as to avoid burning out the combiner 2 due to excessive power after superimposing multiple radio frequency signals.
The value of the first load 6 between each rf channel 1 and the combiner 2 may refer to the data shown in table 1, for example, when there are 2 ports, the value of the first load between each rf channel and the combiner should be greater than 3 db; and when there are 5 ports, the value of the first load between each rf channel and the combiner should be greater than 7 db. The value of the first load 6 between each rf channel 1 and the combiner 2 depends on the actual situation, and the embodiment of the present invention is not limited thereto.
In another preferred embodiment of the present invention, the multi-channel radio frequency test system may further include a first attenuator 7, and the first attenuator 7 may be disposed between the combiner 2 and the spectrometer 3, in the embodiment of the present invention, the first attenuator 7 is preferably a power-adjustable attenuator, and the first attenuator 7 may be configured to reduce the power of the target signal, so as to avoid burning out the spectrometer 3 due to an excessive power of the target signal.
In another preferred embodiment of the present invention, a frequency conversion module (not shown in the figure) of the multi-channel radio frequency test system, one end of the frequency conversion module may be connected to a radio frequency line externally connected to each radio frequency channel 1, and the other end of the frequency conversion module is connected to the combiner 2, and the frequency conversion module may be configured to perform frequency conversion processing on radio frequency signals with the same frequency when at least one group of radio frequency signals with the same frequency exists in each radio frequency signal, for example, if the radio frequency signals from 5 radio frequency channels to the combiner are respectively 10dbm, 10dm, 8dbm, and 6dbm, the radio frequency signals with 10dbm need to be subjected to frequency conversion processing, and after the frequency conversion processing, the powers of the radio frequency signals are all different.
It should be understood that the above examples are only examples for better understanding of the technical solutions of the embodiments of the present invention, and are not to be taken as the only limitation of the embodiments of the present invention.
Of course, in another preferred embodiment of the present invention, a program-controlled switch 8 may be further disposed between the combiner 2 and the spectrometer 3, the program-controlled switch 8 may be controlled by the first controller 4, the program-controlled switch 8 may be controlled according to a preset test time to control to output a target signal to the spectrometer 3, or after the spectrometer 3 completes a previous test, the first controller 4 controls the program-controlled switch 8 to close, so as to output the target signal to the spectrometer 3, so as to perform a performance test on each radio frequency channel 1 at this time.
After the combiner 2 outputs the target signal to the frequency spectrograph 3, the insertion loss value corresponding to each path may be obtained by referring to table 1 in combination with the actual measurement value according to the topology structure of the multi-stage cascaded power combiner of the combiner 2. And measuring the total attenuation values of the radio frequency cable and the loader among the lines by using the frequency spectrograph 3, recording and supplementing the total attenuation values into the frequency spectrograph, and calibrating an output signal.
Further, the frequency point information and the target signal displayed on the spectrometer 3 may be used to determine which radio frequency channel 1 has a problem according to a method commonly used in the prior art, and the specific determination method is not limited in the embodiments of the present invention.
In the embodiment of the invention, the base station version can be changed by operating the first controller 4, the working frequency band and the bandwidth are determined, the cells are distributed and established, the initial frequency points of the radio frequency signals transmitted by the radio frequency channels 1 of the base station are the same, the central frequency point of the radio frequency signals transmitted by the radio frequency channels 1 is adjusted by the frequency conversion module, the frequencies of the radio frequency signals have certain intervals, the radio frequency signals are arranged according to the equal difference of the serial numbers of the radio frequency channels from low to high, such as f1, f2, … and fn, and the frequency interval △ f can be set between 50kHz and 500kHz according to the actual condition of a base station product, so that the test of the multiple base station products can be completed.
When the working bandwidth is large after the base station has a plurality of working frequency bands, the radio frequency signals of a plurality of frequency points need to be verified. For example, m frequency points are selected, the frequency interval is between several mega and several tens mega, and the frequency covers 100MHz or the radio frequency working bandwidth of the base station as much as possible. The frequency conversion module is still used to shift the frequency point of each RF channel, the signals sent by channel 1 are f1, …, fm, and so on, the signals sent by channel N are fn, …, fnm.
It should be noted that, under the condition that each rf channel outputs the same frequency, the base station product needs to perform correlation calibration (such as AC calibration) before performing verification, so as to ensure that the phases and amplitudes of the signals are consistent, otherwise, the signal synthesis accuracy is seriously affected.
In the multi-channel radio frequency test system provided by the embodiment of the invention, the received radio frequency signals of the plurality of radio frequency channels are synthesized through the combiner to obtain a path of target signal, the target signal and the frequency point information corresponding to each radio frequency signal are output to the frequency spectrograph to be displayed, and the performance of each radio frequency channel is tested according to each frequency point information and the target signal. When the embodiment of the invention is used for testing the performance of the multiple radio frequency channels, the radio frequency channels do not need to be switched one by one, so that the testing efficiency of the performance test of the radio frequency channels is improved, manual participation is not needed, and the manpower and material resources are saved.
Example two
Referring to fig. 3, a schematic structural diagram of a multi-channel radio frequency test system provided by an embodiment of the invention is shown,
as shown in fig. 3, the multi-channel rf test system may include a performance detection module, a plurality of rf channels 21, a power splitter 22, a signal source 23,
the signal source 23 may send a signal to be detected to the power splitter 22;
the power distributor 22 may receive the signal to be detected, perform branch processing on the signal to be detected to obtain a plurality of branch signals with different frequencies, and output corresponding radio frequency signals to each radio frequency channel 21;
each radio frequency channel 21 may receive a split signal output by the power splitter 22;
the performance detection module (not shown in the figure) may determine whether each rf channel 21 is in a normal state according to the condition that each rf channel receives the corresponding shunt signal.
In the embodiment of the present invention, when the performance detection module detects that a certain rf channel 21 cannot normally receive or does not receive the branch signal, it indicates that the rf channel 21 may have a fault. For example, rf channel 1, rf channel 2, and rf channel 3, rf channel 1 and rf channel 3 may normally receive the split signal output by the power divider, while rf channel 2 may not receive the split signal output by the power divider, indicating that rf channel 2 has a fault.
It should be understood that the above examples are only examples for better understanding of the technical solutions of the embodiments of the present invention, and are not to be taken as the only limitation of the embodiments of the present invention.
In a preferred embodiment of the present invention, the multi-channel radio frequency test system may further include a second attenuator 27, in the present invention, the second attenuator 27 is preferably an adjustable attenuator, and the second attenuator 27 may be disposed between the signal source 23 and the power divider 22, and may be configured to reduce the power of the signal to be detected, so as to prevent the power divider 22 from being burned out due to excessive power of the signal to be detected.
The power value of the signal to be detected for the second attenuator 27 can be determined according to practical situations, which is not limited by the embodiment of the present invention.
In another preferred embodiment of the present invention, the multi-channel rf test system may further include a plurality of second loads 26, each of which may be disposed between the power divider 22 and each of the rf channels 21, and it is understood that one or more second loads 26 may be disposed between each of the rf channels 21 and the power divider 22, which is not limited in this embodiment of the present invention.
The second load 26 may be used to reduce the split signals corresponding to each rf channel 21 by the same magnitude. For example, the frequencies of the three branch signals are 20, 25 and 30, respectively, and when the frequency reduction operation is performed, the frequencies can be reduced by 5, that is, the frequencies of the adjusted branch signals are 15, 20 and 25, respectively.
It should be understood that the above examples are only examples for better understanding of the technical solutions of the embodiments of the present invention, and are not to be construed as the only limitations of the present invention.
In another preferred embodiment of the present invention, the multi-channel rf testing system may further include a second controller 24, at least one second programmable switch 25 is disposed between each rf channel 21 and the power divider 22, and the value of the second programmable switch 25 disposed between one rf channel 21 and the power divider 22 may be 1, 2, 4, and the like, which is not limited in this embodiment of the present invention.
The second controller 24 may control the opening/closing of the second programmable switch 25 to perform directivity tests for different numbers of radio frequency channels 21.
In the multi-channel radio frequency test system provided by the embodiment of the invention, the power distributor is used for receiving the signal to be detected sent by the signal source and carrying out shunt processing on the signal to be detected, so that a plurality of shunt signals with different frequencies are obtained, corresponding shunt signals are output to each radio frequency channel, and then whether each radio frequency channel is in a normal state or not is determined by the performance detection module according to the condition that each radio frequency channel receives the shunt signals. When the embodiment of the invention is used for testing the performance of the multiple radio frequency channels, the radio frequency channels do not need to be switched one by one, so that the testing efficiency of the performance test of the radio frequency channels is improved, manual participation is not needed, and the manpower and material resources are saved.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The multi-channel radio frequency test system provided by the invention is described in detail, and the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. A multi-channel radio frequency test system is characterized in that the system comprises a plurality of radio frequency channels, a combiner and a frequency spectrograph,
each radio frequency channel is configured to input a corresponding radio frequency signal to the combiner;
the combiner is configured to receive each radio frequency signal, record frequency point information corresponding to each radio frequency signal, perform synthesis processing on each radio frequency signal, synthesize each radio frequency signal into a target signal, and output the target signal and each frequency point information to the spectrometer;
the frequency spectrograph is configured to receive and display the target signal and the frequency point information, and perform performance test on the radio frequency channels according to the frequency point information and the target signal.
2. The system of claim 1, further comprising a first controller, at least one first programmable switch disposed between each of the radio frequency channels and the combiner;
the first controller configured to control opening/closing of the first programmable switch.
3. The system of claim 1, wherein a first load is further disposed between each of the radio frequency channels and the combiner;
each first load is configured to reduce the power of the radio frequency signal output by the corresponding radio frequency channel.
4. The system of claim 1, further comprising a first attenuator disposed between the combiner and the spectrometer;
the first attenuator is configured to reduce the power of the target signal.
5. The system of claim 4, further comprising a frequency conversion module, wherein one end of the frequency conversion module is connected to the radio frequency line externally connected to each of the radio frequency channels, and the other end of the frequency conversion module is connected to the combiner;
the frequency conversion module is configured to perform frequency conversion processing on the radio frequency signals with the same frequency when at least one group of radio frequency signals with the same frequency exists in each radio frequency signal.
6. A multi-channel radio frequency test system, comprising: a performance detection module, a plurality of radio frequency channels, a power divider, a signal source,
the signal source is configured to send a signal to be detected to the power divider;
the power divider is configured to receive the signal to be detected, perform shunt processing on the signal to be detected to obtain a plurality of shunt signals with different frequencies, and output corresponding shunt signals to each radio frequency channel;
each of the radio frequency channels configured to receive a split signal output by the power splitter;
the performance detection module is configured to determine whether each radio frequency channel is in a normal state according to a condition that each radio frequency channel receives a corresponding shunt signal.
7. The system of claim 6, further comprising a second attenuator disposed between the signal source and the power splitter;
the second attenuator is configured to reduce the power of the signal to be detected.
8. The system of claim 6, further comprising a plurality of second loads, each second load disposed between the power divider and each of the radio frequency channels;
the second load is configured to reduce the split signals corresponding to the radio frequency channels by the same amplitude.
9. The system of claim 6, further comprising a second controller, at least one second programmable switch disposed between each of the radio frequency channels and the power splitter;
the second controller configured to control opening/closing of the second programmable switch.
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| CN112996033B (en) * | 2021-01-18 | 2022-07-12 | 讯喆微电子(合肥)有限公司 | Automatic test system of 5G radio frequency PA |
| CN113422657A (en) * | 2021-06-22 | 2021-09-21 | 中国电子科技集团公司第二十九研究所 | Power test system of many transmission channels |
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Application publication date: 20200515 |