CN110233685B - Wireless signal coexistence interference test method and test system thereof - Google Patents
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Abstract
The embodiment of the application provides a wireless signal coexistence interference test method and a test system thereof. The test system comprises a signal processing unit, an anechoic chamber, an interference unit, an attenuation unit and a receiving unit, wherein the interference unit comprises first interference equipment and second interference equipment, the output end of the attenuation unit is in communication connection with the receiving unit, and the signal processing unit is used for processing the coexisting interference of the interference unit. The wireless signal coexistence interference test method and the test system thereof have simple structure and can detect the mutual interference strength of a plurality of interference signals.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a wireless signal coexistence interference test method and a wireless signal coexistence interference test system.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
With the development of electronic product technologies, the use frequency of various wireless devices is higher and higher. However, in use, with the existing use environment and conditions, it is impossible to base all wireless devices on the same service system, so that people can only use the wireless devices under the support of multiple protocols when using the wireless devices, and further, the problem of mutual interference among the wireless devices is caused. For mutual interference among wireless devices, it is necessary to confirm that, in the existing test requirements, the test device of a single wireless product is supported, but mutual interference among a plurality of wireless products cannot be simulated. Meanwhile, the test equipment supporting a plurality of detection channels needs to be combined with the interference equipment through a plurality of transmitting units and judges the interference strength through a plurality of signal processing modes, and the equipment structure is complex.
It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the invention.
Disclosure of Invention
A first technical object of the present invention is to solve the above problems and provide a method for testing wireless signal coexistence interference, in which interfering devices are used as transmitting terminals or interfering terminals of each other, and further, on an existing device supporting detection of a single wireless device, acquisition of a mixed signal and a separated signal is combined, a packet loss rate is calculated and compared by using the acquired signal and a reference signal, and finally, an interference strength between the interfering devices is determined by using the packet loss rate. A second technical object of the present invention is to provide the wireless signal coexistence interference test system.
To achieve the first technical object, the present invention provides a method for testing wireless signal coexistence interference, including: the method comprises the steps of setting up a wireless signal coexistence interference test system comprising a signal processing unit, a anechoic chamber, an interference unit, an attenuation unit and a receiving unit, wherein the interference unit, the attenuation unit and the receiving unit are arranged in the anechoic chamber, and the interference unit comprises first interference equipment and second interference equipment; connecting the output ends of the first interference device and the second interference device with the input end of the attenuation unit, mixing the signals output by the attenuation unit, and receiving the mixed signal by the receiving device; the signal processing unit obtains the mixed signal received by the receiving device, and compares the mixed signal with a reference signal after signal processing to calculate the packet loss rate and assess the interference strength.
Further, signals output by the output end of the attenuation unit are mixed through a combiner, wherein the attenuation unit comprises a first adjustable attenuator and a second adjustable attenuator, the first adjustable attenuator is connected with the first interference device, and the second adjustable attenuator is connected with the second interference device.
Furthermore, the input ends of the first interference device and the second interference device are respectively connected with a signal generator, a first reference signal is obtained between the two signal generators through a frequency synthesis chip, and the packet loss rate is calculated through comparison between the first reference signal and a mixed signal to evaluate the interference strength.
Further, the step of calculating the packet loss rate by comparing the first reference signal with the mixed signal to evaluate the interference strength includes:
calculating that the packet loss rate is less than or equal to 3%, and judging that the coexisting interference strength of the signals is weak;
calculating that the packet loss rate is more than 3% and less than 7%, and judging that the coexisting interference strength of the signals is medium;
and calculating that the packet loss rate is greater than or equal to 7%, and judging that the coexisting signal interference strength is strong.
Further, the method for evaluating the interference strength by comparing the processed mixed signal with the reference signal and calculating the packet loss rate comprises the following steps:
a splitter is connected to one end of the signal processing unit, and the splitter reads the mixed signal processed by the signal processing unit and splits the mixed signal;
the input ends of the first interference device and the second interference device are respectively connected with signal generators, the two signal generators send out reference signals respectively corresponding to the first interference device and the second interference device, and the interference intensity is evaluated by comparing the signals corresponding to the two groups of reference signals and the signals separated by the shunt.
Further, the step of calculating the packet loss rate by comparing the signals corresponding to the two groups of reference signals and the signals separated by the splitter to evaluate the interference strength includes: calculating a first packet loss rate of the reference signal corresponding to the first interference device and a separation signal corresponding to the first interference device in the mixed signal separated by the splitter; calculating a second packet loss rate of the reference signal corresponding to the second interference device and a separation signal corresponding to the second interference device in the mixed signal separated by the splitter; when the packet loss rate is less than or equal to 3%, judging that the interference strength of the interference equipment corresponding to the packet loss rate to another interference equipment is weak; when the packet loss rate is greater than 3% and less than 7%, determining that the interference strength of the interference device corresponding to the packet loss rate to another interference device is medium; and when the packet loss rate is greater than or equal to 7%, judging that the interference strength of the interference device corresponding to the packet loss rate to another interference device is strong.
In order to achieve the second technical object, the present invention further discloses a wireless signal coexistence interference testing system, which includes a signal processing unit, a anechoic chamber, an interference unit, an attenuation unit, and a receiving unit, wherein the interference unit, the attenuation unit, and the receiving unit are respectively disposed in the anechoic chamber, the interference unit includes a first interference device and a second interference device, the first interference device and the second interference device are respectively electrically connected to an input end of the attenuation unit, an output end of the attenuation unit is in communication connection with the receiving unit, an output end of the receiving unit is electrically connected to the signal processing unit, and the signal processing unit performs signal processing on coexistence interference of the interference unit.
In the embodiment of the present invention, the first interfering device is used as the transmitting end/interfering end of the second interfering device, and the second interfering device is used as the interfering end/transmitting end of the first interfering device, and the packet loss ratio is obtained by obtaining and comparing a mixed signal and a separated signal between the first interfering device and the second interfering device.
Furthermore, the attenuation unit includes a first adjustable attenuator and a second adjustable attenuator, the first adjustable attenuator is connected to the first interference device, the second adjustable attenuator is connected to the second interference device, output ends of the first adjustable attenuator and the second adjustable attenuator are connected to a combiner, the receiving unit includes a receiving device, and the receiving device is in communication connection with the combiner.
Furthermore, the input end of the first interference device is connected with a first signal generator, the input end of the second interference device is connected with a second signal generator, the first signal generator and the second signal generator are both located in the anechoic chamber and connected with a frequency synthesis chip, and the frequency synthesis chip is electrically connected with the signal processing unit.
Furthermore, the signal processing unit is connected with a splitter, and the splitter is electrically connected with the first signal generator and the second signal generator.
According to the wireless signal coexistence interference test method and the test system thereof, the first interference equipment is used as the transmitting end/interference end of the second interference equipment, the second interference equipment is used as the interference end/transmitting end of the first interference equipment, the acquisition of the mixed signal and the separation signal is combined, the packet loss rate is calculated and compared through the acquired signal and the reference signal, and then the mutual interference strength is judged through the packet loss rate, so that the mutual interference strength among a plurality of interference equipment can be realized by simply improving the existing equipment supporting the detection of single wireless equipment, the equipment structure is simple, and the use is convenient.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart illustrating a method for testing coexistence interference of radio signals according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a radio signal coexistence interference testing system according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a signal processing portion in a wireless signal coexistence interference test system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, in the description of the present invention, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is considered as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Example (b): referring to fig. 1, a method for testing coexistence interference of radio signals includes the following steps S1-S3:
s1, building a wireless signal coexistence interference test system comprising a signal processing unit, a anechoic chamber, an interference unit, an attenuation unit and a receiving unit, wherein the interference unit, the attenuation unit and the receiving unit are arranged in the anechoic chamber, and the interference unit comprises first interference equipment and second interference equipment;
s2, connecting the output ends of the first interference device and the second interference device with the input end of the attenuation unit, mixing the signals output by the attenuation unit, and receiving the mixed signal by the receiving device;
s3, the signal processing unit obtains the mixed signal received by the receiving device, and compares the mixed signal with the reference signal after signal processing to calculate the packet loss rate and assess the interference strength.
In an optional scheme of this embodiment, signals output by the output end of the attenuation unit are mixed by the combiner, where the attenuation unit includes a first adjustable attenuator and a second adjustable attenuator, the first adjustable attenuator is connected to the first interference device, and the second adjustable attenuator is connected to the second device. The signal size in the circuit is adjusted through the first adjustable attenuator and the second adjustable attenuator, impedance matching is improved, impedance change is buffered, the level of an output end is adjusted through automatic gain, and then a stable output signal is obtained.
Further, the input ends of the first interference device and the second interference device are respectively connected with a signal generator, in practical application, the first interference device and the second interference device may be wireless devices that can be simply thought of by a person skilled in the art, such as a bluetooth device and a router, and this embodiment is not repeated. A first reference signal is obtained between the two signal generators through a frequency synthesis chip, the packet loss rate is calculated through comparison of the first reference signal and the mixed signal to evaluate the interference strength, a target signal is input into interference equipment according to needs by adjusting the signal generators, the reference signal is convenient to determine, and the workload of later comparison test results is reduced.
As a preferable scheme of this embodiment, the interference strength is evaluated by comparing the first reference signal with the mixed signal to calculate the packet loss ratio, and the specific evaluation criteria include the following:
calculating that the packet loss rate is less than or equal to 3%, and judging that the coexisting interference strength of the signals is weak;
calculating that the packet loss rate is more than 3% and less than 7%, and judging that the coexisting interference strength of the signals is medium;
and calculating that the packet loss rate is greater than or equal to 7%, and judging that the coexisting signal interference strength is strong.
As another preferable scheme of this embodiment, the method for evaluating the interference strength by comparing the packet loss ratio calculated by performing signal processing on the mixed signal with the reference signal includes the following steps:
one end of the signal processing unit is connected with a splitter, and the splitter reads the mixed signal processed by the signal processing unit and separates the mixed signal;
the input ends of the first interference equipment and the second interference equipment are connected with the signal generators, the two signal generators send out reference signals respectively corresponding to the first interference equipment and the second interference equipment, and the interference strength is evaluated by comparing the corresponding signals of the two groups of reference signals with the signals separated by the shunt to calculate the packet loss rate.
In the above, the interference strength is evaluated by comparing the two sets of reference signals with the signal separated by the splitter, and the specific evaluation criteria include the following:
calculating a reference signal corresponding to the first interference equipment and a first packet loss rate of a separation signal corresponding to the first interference equipment in the mixed signal separated by the splitter;
calculating a second packet loss rate of a reference signal corresponding to second interference equipment and a separation signal corresponding to the second interference equipment in the mixed signal separated by the splitter;
when the packet loss rate is less than or equal to 3%, judging that the interference strength of the interference equipment corresponding to the packet loss rate to another interference equipment is weak;
when the packet loss rate is greater than 3% and less than 7%, determining that the interference strength of the interference device corresponding to the packet loss rate to another interference device is medium;
and when the packet loss rate is greater than or equal to 7%, judging that the interference strength of the interference device corresponding to the packet loss rate to another interference device is strong.
Based on the same inventive concept, an embodiment of the present invention further provides a wireless signal coexistence interference testing system, which is shown in fig. 2 and includes a signal processing unit, a anechoic chamber, an interference unit, an attenuation unit, and a receiving unit, wherein the interference unit, the attenuation unit, and the receiving unit are respectively disposed in the anechoic chamber, the interference unit includes a first interference device and a second interference device, the first interference device and the second interference device are respectively electrically connected to an input end of the attenuation unit, an output end of the attenuation unit is in communication connection with the receiving unit, an output end of the receiving unit is electrically connected to the signal processing unit, and the signal processing unit performs signal processing on coexistence interference of the interference unit.
In the present embodiment, the signal processing unit is a structure that can be easily thought by those skilled in the art and is suitable for the embodiments of the present application, such as a signal conditioning circuit, a signal amplifying circuit, and a filter circuit that are connected in sequence, and other signal processing units that can be obvious or known by those skilled in the art and are suitable for the embodiments of the present application.
The first interference equipment is used as a transmitting end/interference end of the second interference equipment, the second interference equipment is used as an interference end/transmitting end of the first interference equipment, the attenuation unit is used for stabilizing the output level of the interference equipment, the mixed signal and the separated signal are processed through the signal processing unit, the packet loss rate is calculated and compared through the acquired signal and the reference signal, and then the mutual interference strength is judged through the packet loss rate, so that the mutual interference strength of a plurality of interference equipment can be realized by simply improving the existing equipment supporting the detection of single wireless equipment, the equipment is simple in structure and convenient and fast to use.
As an alternative to this embodiment, referring to fig. 3, the attenuation unit includes a first adjustable attenuator and a second adjustable attenuator, the first adjustable attenuator is connected to the first interference device, the second adjustable attenuator is connected to the second device, output ends of the first adjustable attenuator and the second adjustable attenuator are connected to a combiner, the receiving unit includes a receiving device, and the receiving device is in communication connection with the combiner. The hybrid signal of the first interference device and the second interference device is obtained through the combiner, and in this embodiment, the receiving device may be a device that can be easily thought by those skilled in the art, such as a control computer.
Preferably, as an embodiment of the foregoing scheme, an input end of the first interfering device is connected to a first signal generator, an input end of the second interfering device is connected to a second signal generator, and both the first signal generator and the second signal generator are located in the anechoic chamber and connected to the frequency synthesis chip, and in this embodiment, the frequency synthesis chip selects the phase-locked loop frequency synthesis chip ADF 4350. The frequency synthesis chip is electrically connected with the signal processing unit. The first signal generator and the second signal generator are arranged, so that simple pulse signals can be input into the interference equipment as required, the calculation difficulty of the subsequent packet loss rate is reduced, and the test efficiency of wireless signal interference is improved. The frequency synthesis chip integrates signals of the first signal generator and the second generator entering and exiting the interference unit to obtain a reference signal, and the packet loss rate is obtained by calculating and comparing the reference signal with a mixed signal generated in the combiner. When the calculated packet loss rate is less than or equal to 3%, judging that the signal coexistence interference strength between the first interference equipment and the second interference equipment is weak; when the calculated packet loss rate is greater than 3% and less than 7%, judging that the signal coexistence interference strength between the first interference equipment and the second interference equipment is medium; and when the calculated packet loss rate is greater than or equal to 7%, judging that the signal coexistence interference strength between the first interference equipment and the second interference equipment is strong.
Preferably, the signal processing unit is connected to a splitter, and the splitter is electrically connected to the first signal generator and the second signal generator. When the interference signal is output, two pulse signals (reference signals) with different bandwidths and different frequencies are generated by the first signal generator and the second signal generator and are respectively input into the first interference device and the second interference device as output signals, and are output into the combiner through the first interference device and the second interference device. The signal processing unit receives the mixed signal sent by the combiner, performs demodulation and amplification processing on the mixed signal, separates the processed signal according to bandwidth and frequency, compares the separated signal obtained after separation with pulses of the first signal generator and the second signal generator respectively to calculate a packet loss rate, compares the separated signal with close bandwidth and frequency with a reference signal during comparison, and calculates a corresponding packet loss rate. When the packet loss rate is less than or equal to 3%, judging that the interference strength of the interference equipment corresponding to the packet loss rate to another interference equipment is weak; when the packet loss rate is greater than 3% and less than 7%, determining that the interference strength of the interference device corresponding to the packet loss rate to another interference device is medium; and when the packet loss rate is greater than or equal to 7%, judging that the interference strength of the interference device corresponding to the packet loss rate to another interference device is strong.
The working principle is as follows: the two interference devices are used as mutually-alternated transmitting terminals or interference terminals, the packet loss rate is obtained by comparing and calculating the mixed signal with the synthesized signal, and then the interference strength is judged; or the mixed signal is separated again and then compared with a source signal (reference signal) to select the packet loss rate, so as to judge the interference strength.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A method for testing wireless signal coexistence interference, comprising:
the method comprises the steps of setting up a wireless signal coexistence interference test system comprising a signal processing unit, a anechoic chamber, an interference unit, an attenuation unit and a receiving unit, wherein the interference unit, the attenuation unit and the receiving unit are arranged in the anechoic chamber, and the interference unit comprises first interference equipment and second interference equipment;
connecting the output ends of the first interference device and the second interference device with the input end of the attenuation unit, mixing the signals output by the attenuation unit, and receiving the mixed signal by the receiving unit;
the signal processing unit acquires the mixed signal received by the receiving unit, and compares the mixed signal with a reference signal after signal processing to calculate the packet loss rate and assess the interference strength;
mixing signals output by the output end of the attenuation unit through a combiner, wherein the attenuation unit comprises a first adjustable attenuator and a second adjustable attenuator, the first adjustable attenuator is connected with the first interference equipment, and the second adjustable attenuator is connected with the second interference equipment;
the input ends of the first interference equipment and the second interference equipment are respectively connected with a signal generator, a first reference signal is obtained between the two signal generators through a frequency synthesis chip, and the interference strength is evaluated through comparing the first reference signal with a mixed signal to calculate the packet loss rate;
the method for evaluating the interference strength by comparing the first reference signal with the mixed signal to calculate the packet loss rate comprises the following steps:
calculating that the packet loss rate is less than or equal to 3%, and judging that the coexisting interference strength of the signals is weak;
calculating that the packet loss rate is more than 3% and less than 7%, and judging that the coexisting interference strength of the signals is medium;
and calculating that the packet loss rate is greater than or equal to 7%, and judging that the coexisting signal interference strength is strong.
2. The method of claim 1, wherein the step of evaluating the interference strength by comparing the processed mixed signal with a reference signal and calculating a packet loss ratio comprises:
a splitter is connected to one end of the signal processing unit, and the splitter reads the mixed signal processed by the signal processing unit and splits the mixed signal;
the input ends of the first interference device and the second interference device are respectively connected with signal generators, the two signal generators send out reference signals respectively corresponding to the first interference device and the second interference device, and the interference intensity is evaluated by comparing the signals corresponding to the two groups of reference signals and the signals separated by the shunt.
3. The method of claim 2, wherein the evaluating the interference strength by comparing the two sets of reference signals with the signal split by the splitter comprises:
calculating a first packet loss rate of the reference signal corresponding to the first interference device and a separation signal corresponding to the first interference device in the mixed signal separated by the splitter;
calculating a second packet loss rate of the reference signal corresponding to the second interference device and a separation signal corresponding to the second interference device in the mixed signal separated by the splitter;
when the packet loss rate is less than or equal to 3%, judging that the interference strength of the interference equipment corresponding to the packet loss rate to another interference equipment is weak;
when the packet loss rate is greater than 3% and less than 7%, determining that the interference strength of the interference device corresponding to the packet loss rate to another interference device is medium;
and when the packet loss rate is greater than or equal to 7%, judging that the interference strength of the interference device corresponding to the packet loss rate to another interference device is strong.
4. A wireless signal coexistence interference test system for implementing the test method according to any one of claims 1 to 3, the system comprising a signal processing unit, a anechoic chamber, an interference unit, an attenuation unit, and a receiving unit, wherein the interference unit, the attenuation unit, and the receiving unit are respectively disposed in the anechoic chamber, the interference unit comprises a first interference device and a second interference device, the first interference device and the second interference device are respectively electrically connected to an input end of the attenuation unit, an output end of the attenuation unit is in communication connection with the receiving unit, an output end of the receiving unit is electrically connected to the signal processing unit, and the signal processing unit performs signal processing on coexistence interference of the interference unit;
the attenuation unit comprises a first adjustable attenuator and a second adjustable attenuator, the first adjustable attenuator is connected with the first interference equipment, the second adjustable attenuator is connected with the second interference equipment, the output ends of the first adjustable attenuator and the second adjustable attenuator are connected with a combiner, the receiving unit comprises receiving equipment, and the receiving equipment is in communication connection with the combiner;
the input end of the first interference equipment is connected with a first signal generator, the input end of the second interference equipment is connected with a second signal generator, the first signal generator and the second signal generator are both positioned in the anechoic chamber and connected with a frequency synthesis chip, and the frequency synthesis chip is electrically connected with the signal processing unit.
5. The wireless signal coexistence interference testing system according to claim 4, wherein a splitter is connected to the signal processing unit, and the splitter is electrically connected to the first signal generator and the second signal generator through the frequency synthesizing chip.
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