CN111726828A - Method and device for testing XPIC performance of microwave transmission equipment - Google Patents

Method and device for testing XPIC performance of microwave transmission equipment Download PDF

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CN111726828A
CN111726828A CN202010612632.9A CN202010612632A CN111726828A CN 111726828 A CN111726828 A CN 111726828A CN 202010612632 A CN202010612632 A CN 202010612632A CN 111726828 A CN111726828 A CN 111726828A
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xpic
polarization
performance
microwave transmission
transmission equipment
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CN111726828B (en
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周峰
成锴
纪锐
沈岸平
张�诚
张颖艳
张大元
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China Academy of Information and Communications Technology CAICT
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China Academy of Information and Communications Technology CAICT
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/345—Interference values
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/002—Reducing depolarization effects

Abstract

The invention provides a method and a device for testing XPIC performance of microwave transmission equipment, which relate to the technical field of communication, can realize effective test on the XPIC performance of the microwave transmission equipment, and have simple test device and safe and reliable test results; the device includes: the transmitting equipment and the receiving equipment to be tested are used for transmitting and receiving microwave signals; the through type polarization degradation plate is arranged between the transmitting equipment and the receiving equipment and is used for carrying out degradation separation on the electromagnetic wave so as to separate the electromagnetic wave into two electromagnetic wave signals with different polarization directions; a network performance analyzer V for measuring the reception power of the reception device in the vertical polarization direction; a network performance analyzer H for measuring the receiving power of the receiving device in the horizontal polarization direction; and calculating the polarization coupling interference ratio according to the measured received power, and analyzing the XPIC performance of the microwave transmission equipment. The technical scheme provided by the invention is suitable for the XPIC performance test process of the microwave transmission equipment.

Description

Method and device for testing XPIC performance of microwave transmission equipment
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of communication, in particular to a method and a device for testing XPIC (X-ray integrated circuit) performance of microwave transmission equipment.
[ background of the invention ]
In a wireless mobile communication system, a microwave transmission device is very critical and is an important component device of a transmission network. XPIC is a function of microwave transmission equipment, and XPIC English full name Cross Polarization cancellation, namely Cross Polarization interference cancellation, is a technology used in cooperation with CCDP (common channel dual Polarization). CCDP utilizes two orthogonal polarized waves to transmit signals to realize the doubling of transmission capacity, and XPIC is used for eliminating the cross interference between two polarized waves. Ideally, the 2 co-frequency microwave signals of CCDP are orthogonal signals, and no interference occurs between the two signals, so that the receiver can easily recover the 2 signals. However, under the actual engineering conditions, no matter how orthogonal the two paths of electromagnetic waves are, the two paths of electromagnetic waves are always influenced by the polarization ratio of the antenna, and the electromagnetic wave polarization degradation is caused by rainfall, snowfall, ice crystals and sand storm on a transmission space channel, so that the signals are inevitably interfered. To counteract these interferences, it is necessary to use XPIC techniques. The basic principle of XPIC technology is to receive signals from both horizontal and vertical polarization directions and to process them to reduce the effect of cross-polarization interference. A plurality of patents can be inquired about the realization scheme of the XPIC at present, but corresponding technologies for the test verification and the performance evaluation of the XPIC function are lacked all the time.
Accordingly, there is a need to develop a method and apparatus for testing XPIC performance of microwave transmission equipment to address the deficiencies of the prior art and to solve or mitigate one or more of the problems set forth above.
[ summary of the invention ]
In view of this, the invention provides a method and a device for testing microwave transmission equipment XPIC performance, which can realize effective test on microwave transmission equipment XPIC performance, and the test device is simple and the test result is safe and reliable.
In one aspect, the present invention provides an apparatus for testing XPIC performance of microwave transmission equipment, which is characterized in that the apparatus comprises:
the transmitting equipment and the receiving equipment to be tested are used for transmitting and receiving microwave signals;
the through type polarization degradation plate is arranged between the transmitting equipment and the receiving equipment and is used for carrying out degradation separation on the electromagnetic wave so as to separate the electromagnetic wave into two electromagnetic wave signals with different polarization directions;
a network performance analyzer V for measuring the reception power of the reception device in the vertical polarization direction;
a network performance analyzer H for measuring the receiving power of the receiving device in the horizontal polarization direction;
and calculating the polarization coupling interference ratio according to the measured received power, and analyzing the XPIC performance of the microwave transmission equipment.
The foregoing aspect and any possible implementation manner further provide an implementation manner, where the apparatus further includes a monitoring antenna M disposed on the transceiving path and a spectrum analyzer connected to the monitoring antenna M, and is configured to measure the transmission spectra in different polarization directions to determine whether the apparatus has a co-frequency XPIC function.
The above-mentioned aspect and any possible implementation manner further provide an implementation manner, where the pass-through polarization degradation plate includes a dielectric plate and metal units disposed on a surface of the dielectric plate, and the metal units are arranged in a periodic array.
The above aspects and any possible implementations further provide an implementation where the metal unit has a shape of an ellipse, a parallelogram, a trapezoid, a figure "8" with an opening, or any combination thereof.
The above aspect and any possible implementation manner further provide an implementation manner, wherein the "8" shape with the opening is specifically open at two ends; length L of "8" shaped metal uniteeLess than 0.5 lambdaminWidth WeeLess than 0.3 lambdaminWherein λ isminIs the minimum wavelength of the electromagnetic wave in the working frequency range of the metal unit.
The above aspect and any possible implementation manner further provide an implementation manner, and the manner of configuring different polarization coupling interference ratios for the pass-through polarization degradation plate includes: and superposing a plurality of pass-type polarization degradation plates, adjusting the axial line of the metal unit on the pass-type polarization degradation plate and the included angle theta between the axial line and the cross isolation direction, adjusting the periodic array structure of the metal unit on the pass-type polarization degradation plate and randomly combining the three configuration modes.
In another aspect, the present invention provides a method for testing XPIC performance of microwave transmission equipment, wherein the method is implemented by using any one of the apparatuses described above;
the method comprises the following steps: s1, judging whether the current device meets the requirement of an XPIC performance test; if the condition is met, entering the next step, otherwise, judging again; s2, measuring the received power and calculating the polarization coupling interference ratio I of the test system of the test pass type polarization degradation boarda(ii) a Measuring received power and calculating to obtain vertical polarization coupling interference ratio I of adopted pass-through type polarization degradation plateVAnd a horizontally polarized coupling interference ratio IH(ii) a S3, coupling interference ratio I according to vertical polarizationVHorizontal polarization coupling interference ratio IHAnd the polarization coupling interference ratio I of the test system itselfaJudging whether the measurement result is credible or not according to the relation between the measurement result and the reference value, if so, entering the next step, and otherwise, returning to the step S2; and S4, using the pass-through polarization degradation board which is tested to determine the polarization coupling interference ratio parameter to test and judge whether the XPIC performance of the microwave transmission equipment is qualified.
In the above-described aspect and any possible implementation manner, there is further provided an implementation manner that the criterion for judging the credibility of the measurement result in S3 is: i isV-IaNot less than 3dB and IH-Ia≥3dB。
As to the above-mentioned aspect and any possible implementation manner, there is further provided an implementation manner, where the requirement that the current apparatus in S1 meets the XPIC performance test specifically is: and simultaneously, the conditions of maximum throughput ratio, packet loss rate and frequency spectrum are met.
As described in the foregoing aspect and any possible implementation manner, an implementation manner is further provided, where the maximum throughput ratio condition is specifically: maximum throughput S of V channelVFAnd maximum throughput S of H channelHFThe ratio of the larger value to the smaller value is not more than 1.05;
the packet loss rate conditions are specifically as follows: the packet loss rates of the V channel and the H channel are both 0;
the frequency spectrum condition is specifically as follows: the emission spectrum of the V channel is completely overlapped with the emission spectrum of the H channel; the method for measuring the emission spectrum comprises the following steps: setting a monitoring antenna M to be in a vertical polarization mode, and measuring by using a frequency spectrograph to obtain a transmission frequency spectrum of a V channel; the monitoring antenna M is set to a horizontal polarization mode, and the transmission spectrum of the H channel is measured using a spectrometer.
In the foregoing aspect and any possible implementation manner, a further implementation manner is provided, where the criterion for determining that the XPIC performance of the microwave transmission device in S4 is qualified is: under the premise that the channel packet loss rate is 0 and the data rate is not reduced, the vertical polarization coupling interference ratio I used in the test isVOr horizontally polarized coupling interference ratio IHGreater than a threshold value related to the anti-interference performance of the digital modulation itself;
vertical polarization coupling interference ratio IVOr horizontally polarized coupling interference ratio IHThe higher the XPIC performance of the microwave transmission equipment to be tested, the better.
Compared with the prior art, the invention can obtain the following technical effects: through setting up through-type polarization degradation board and carrying out the degradation separation to the electromagnetic wave, recalculation polarization coupling interference ratio again analyzes microwave transmission equipment's XPIC performance, can realize the effective test to microwave transmission equipment XPIC performance, and testing arrangement is simple, test result safe and reliable.
Of course, it is not necessary for any one product in which the invention is practiced to achieve all of the above-described technical effects simultaneously.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a main functional schematic diagram of a pass-through polarization degradation plate provided by an embodiment of the present invention;
fig. 2 is a unit structure view of a pass-through polarization degradation plate provided in one embodiment of the present invention;
FIG. 3 is a graph of a periodic array distribution of a pass-through polarization degenerate plate according to an embodiment of the present invention;
FIG. 4 is a connection diagram of transmit spectrum monitoring provided by one embodiment of the present invention;
FIG. 5 is a structural diagram of an apparatus for testing XPIC performance of microwave transmission equipment according to an embodiment of the present invention;
fig. 6 is a schematic diagram of interference vectors (for example, 16 QAM) causing misjudgment of digital modulation according to an embodiment of the present invention;
FIG. 7 is a graph of the electromagnetic field cross-polarization degradation ratio of a pass-through polarization degradation plate provided by an embodiment of the present invention as a function of cell tilt angle;
FIG. 8 is a distribution diagram of a pass-through polarization degenerate plate array of elliptical cell structures provided by one embodiment of the present invention;
fig. 9 is a simulation result of "vertical polarization coupling interference ratio" provided by an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all 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.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The invention provides a concept of a pass-through polarization degradation plate, which has the following functions: when a certain polarized electromagnetic wave passes through the 'pass-type polarization degradation plate', most of the power of the electromagnetic wave can pass through the main polarization direction of the 'pass-type polarization degradation plate', and if the cross-polarized electromagnetic wave in the main polarization direction passes through and then the polarization of the cross-polarized electromagnetic wave is degraded, namely, certain electromagnetic wave power is transferred to the main polarization direction, interference is generated on a main polarization direction channel signal. As shown in fig. 1(a) and (b).
The design of the invention is a design with adjustable polarization degradation performance, namely, a periodic arrangement structure of metal units is firstly designed, the transverse length of the metal units is longer than the longitudinal length of the metal units, as shown in figure 2, a coordinate system of a main polarization direction and a cross polarization direction is firstly defined, then a metal film unit structure is designed in the coordinate system, a typical unit structure can be an ellipse, a parallelogram, a trapezoid or a combination thereof, can be manufactured by a metal CNC (computer numerical control) process, can also be attached to a dielectric plate by a printed circuit board process, and aiming at broadband application, the invention provides an open 8-shaped unit structure. Two rings of the 8-shaped unit structure are both of an open structure. Let the minimum wavelength of the electromagnetic wave in its operating frequency range be λminLength of cell LeeShould be less than 0.5 lambdaminWidth W of the celleeShould be less than 0.3 lambdamin,，WeeShould be less than LeeThe schematic diagram of the cell is shown in fig. 2, and the schematic diagram of the distribution of the periodic array is shown in fig. 3. The aperture size of the pass-through polarization degradation plate should be able to cover the size of the aperture of the microwave transmission system antenna under test.
1. "main polarization direction insertion loss" of "pass through polarization degraded plate" and test method:
taking the example of main polarization as vertical polarization, a test transmitting-receiving antenna with better cross polarization is selected, and the transverse dimension and the longitudinal dimension of the antenna opening surface are all larger than the wavelength of working electromagnetic waves. When no shielding object exists on the transmission path, the aperture surfaces of the transmitting antenna and the receiving antenna are opposite, the polarization directions are vertical polarization, the distance between the aperture surfaces of the transmitting antenna and the receiving antenna is D, and the receiving power measured by the dBm dimension at the moment is recorded as PaVVThen inserting a through type polarization degradation plate in the center of the connecting line of the transmitting antenna and the receiving antenna, measuring the receiving power of dBm dimension at the moment when the intersection point of the connecting line between the transmitting antenna and the receiving antenna and the through type polarization degradation plate is near the center area of the through type polarization degradation plate, properly translating the polarization degradation plate, and taking the minimum receiving power as PVVThen perpendicular polarization penetration loss LVVIs defined as PaVVAnd PVVThe difference of (a).
LVV＝PaVV-PVV(1)
Generally, L is required in the testVVShould be less than 3dB, preferably where the transmit and receive antennas should be of the same type. The test method of mainly polarizing into horizontal polarization can be analogized.
2. Definition of "vertical polarization coupling interference ratio" and "horizontal polarization coupling interference ratio" of "pass-through polarization degradation plate":
as shown in FIG. 1, the field intensity at the incident vertically polarized plane wave is EVWhen the electromagnetic wave passes through the passing type polarization degradation plate for a certain distance, the electromagnetic wave is degraded into the combination of two polarization electromagnetic waves: field strength of EVVAnd a field strength of EVHThe horizontally polarized wave of (4); at an incident horizontally polarized plane wave field strength of EHWhen the electromagnetic wave passes through the passing type polarization degradation plate for a certain distance, the electromagnetic wave is degraded into the combination of two polarization electromagnetic waves: field strength of EHHAnd a field strength of EHVThe vertically polarized wave of (1). For the convenience of derivation and practical test, the incident wave field intensity E can be setVAnd EHAre equal, it is obvious that there are two polarization channelsIn the course of transmission, EHVTo EVVCause coupling interference, EHVTo EVVIs caused by coupling interference, the "vertical polarization coupling interference ratio" IVIs defined as:
Figure BDA0002562638770000071
"horizontal polarization coupling interference ratio" IHIs defined as:
Figure BDA0002562638770000072
the unit of field strength is in V/m.
3. The method for testing the vertical polarization coupling interference ratio and the horizontal polarization coupling interference ratio of the pass-through polarization degradation plate comprises the following steps:
the measurement of the polarization coupling interference ratio can be experimented with by power measurements, measurement of the "vertical polarization coupling interference ratio": firstly, selecting a test transceiving antenna with better cross polarization, wherein the mouth surfaces of a transmitting antenna and a receiving antenna are opposite when no shielding object exists on a transmission path, the transmitting antenna is set to be horizontally polarized, the polarization of the receiving antenna is set to be vertically polarized, the distance between the mouth surfaces of the antennas is D, and the measured receiving power of dBm dimension at the moment is recorded as PaHVIn combination with P which has been measured previouslyaVVPolarization coupling interference ratio of antenna itself IaCan be defined as:
Ia＝PaHV-PaVV(4)
then inserting a through type polarization degradation plate into the connection line midpoint of the transmitting and receiving path, and measuring the receiving power of the dBm dimension at the moment and recording the receiving power as PHVCombined with the already determined PVV"vertical polarization coupling interference ratio" I in dB dimensionVThe measurement results are:
IV＝PHV-PVV(5)
the polarization of the transmitting antenna is set to be horizontal, the polarization of the receiving antenna is set to be horizontal, the face of the antenna is right opposite to the face of the antenna and the distance is D, and D at the moment is measuredThe received power in Bm dimension is denoted as PHHThen, the transmitting antenna is adjusted to be vertically polarized, and the received power measured in dBm dimension at that time is recorded as PVH"horizontal polarization coupling interference ratio" I in dB dimensionHThe measurement results are:
IH＝PVH-PHH(6)
the transmitted power was unchanged in the above test and was only at IVAnd IHMeasured result ratio of (1)aGreater than 3dB, it is considered authentic. Because the parameters of the pass-through polarization degradation board are different when the pass-through polarization degradation board is placed in different postures, the polarization coupling interference ratio parameter used when the microwave transmission equipment is tested is a test calibration value under the same posture.
Different 'polarization coupling interference ratio' parameters of the pass-through type polarization degradation plate need to be configured in the test, and the parameters can be obtained through the following methods: 1. a mode of overlapping a plurality of plates can be used; 2. as shown in fig. 2, the included angle θ between the axis of the unit on the board and the cross isolation direction can be adjusted; 3. as shown in fig. 3, the distribution of the periodic structure of the pass-through polarization degenerate plate, such as the pitch of the unit structure, can be adjusted.
As shown in fig. 4, the configuration testing apparatus, the tested microwave transmission system has a common-channel dual-polarization feature, the distance between the transmitting antenna and the receiving antenna is D, there is no obstruction on the transmission path, and the transmitting end data input interface of vertical polarization and the receiving end data output interface of vertical polarization are connected to the network performance analyzer V (the transmitting end data input interface of vertical polarization and the receiving end data output interface of vertical polarization are connected to the transmitting and receiving ports of the network performance analyzer V, respectively), so as to form a vertical polarization transmission channel, referred to as V channel for short; the horizontally polarized transmitter data input interface and the horizontally polarized receiver data output interface are connected to a network performance analyzer H (the horizontally polarized transmitter data input interface and the horizontally polarized receiver data output interface are respectively connected to the transmitting port and the receiving port of a network performance analyzer V), so that a horizontally polarized transmission channel, referred to as H channel for short, is formed. The model of the network performance analyzer used by the two channels is not specifically limited, and an applicable model can be selected at will under the condition of meeting the precision requirement.
The transmitting power of the V channel is the same as that of the H channel, and full-rate air interface data transmission is started at the same time, so that the signal-to-noise ratio of the receiving end is ensured to be excellent and higher than the minimum signal-to-noise ratio required by the used modulation mode. Under the set transmitting and receiving state, the maximum throughput of the two channels is respectively measured by using a network performance analyzer V and a network performance analyzer H, which are respectively marked as SVFAnd SHFAt this time SVFAnd SVFThe values should be close, with the ratio of the larger and smaller of the 2 values being unduly in excess of 1.05. The packet loss rates of both the V and H channels are 0.
As shown in fig. 4, a linear polarization monitoring antenna M is disposed on the transmit-receive path of the system under test, and the aperture size of M is smaller than the size of the receiving end under test by more than 3 times. Firstly, setting an antenna M to be in a vertical polarization mode, and measuring a V channel transmission frequency spectrum by using a frequency spectrograph; the antenna M is then set to a horizontally polarized mode and the H-channel transmit spectrum is measured using a spectrometer. If the frequency spectrums of the V channel and the H channel are completely overlapped, the requirement of the same-frequency XPIC function is met.
As shown in FIG. 5, a pass-through polarization degradation plate DP is inserted into the center of the connection line between the transmitting antenna and the receiving antenna of the microwave transmission system to be tested, and the vertical polarization coupling interference ratio of the pass-through polarization degradation plate in the posture used for the test is set as IVI of pass-type polarization degradation plate under different modulation modesVShould be greater than the following table threshold values, these threshold values IVgCan be solved by the following equation.
IVg+PAPRH＝-GSNRV(7)
The horizontal polarization coupling interference ratio of the 'pass type polarization degradation plate' in the posture used in the test is IHI of pass-type polarization degradation plate under different modulation modesHShould be greater than the following table threshold values, these threshold values IHgCan be solved by the following equation.
IHg+PAPRV＝-GSNRH(8)
Wherein the dimensions of the above parameters are all dB,PAPRHIs the peak-to-average ratio of the H channel modulation mode, GSNRVIs the signal-to-noise ratio threshold of the V channel modulation scheme. PAPRVIs the peak-to-average ratio of the V-channel modulation mode, GSNRHIs the signal-to-noise ratio threshold of the H channel modulation scheme.
For PAPR and GNSR for different modulations, reference can be made to table 1 below. Regarding the principle of GSNR formation, reference may be made to the interference vector diagram of fig. 6, which results in digital modulation misjudgment. Considering that the peak-to-average ratio of the modulation waveform depends on the roll-off coefficient, the PAPR shown in table 1 is the peak-to-average ratio of the constellation vector, and these two values are very close. In addition, when modulation modes such as OFDM and the like are used, a simulated value or a measured value of PAPR can be adopted; there will be slight differences in GSNR based on different demodulation decision algorithms, with the data in table 1 as a reference.
TABLE 1 parameter table for different modulations
Modulation system PAPR(dB) GSNR(dB)
4QAM 0.00 3.00
16QAM 2.55 10.00
64QAM 3.68 16.23
256QAM 4.23 22.30
1024QAM 4.50 28.34
As shown in FIG. 5, a pass-through polarization degradation plate DP is inserted into the center of the connection line between the transmitting antenna and the receiving antenna of the microwave transmission system to be tested, and the vertical polarization coupling interference ratio I of the pass-through polarization degradation plate in the used posture is testedVIf the threshold value is larger than the threshold value in claim 10, and the data rate and the packet loss rate (or the bit error rate) of the vchannel are measured by using the network performance analyzer V, the test results can be described by using table 2. If no drop of the data rate of the V channel is observed and no packet loss rate (or bit error rate) of the V channel is observed, the higher I can be obtained by replacing the V channel with the V channelVTesting by passing through type polarization degradation board, and using vertical polarization coupling interference ratio IVThe higher the measured transmission channel is, the lower the data rate and the packet loss rate (bit error rate) do not occur, which indicates that the XPIC function of the measured system is stronger.
Example 1:
firstly, according to the figure 3, simulation modeling of a pass-through polarization degradation board is carried out, a printed circuit board substrate in a simulation model is FR4 material, simulation is carried out by using a time domain finite difference method, incident polarization is as the main polarization direction in the figure 2, and the depolarization effect is defined as that the parameter of the electromagnetic field cross polarization degradation ratio is as the electric field intensity E in the figure 1VHAnd EVVIn which EVHAnd EVVThe root mean square value on the simulation plane is taken. And different unit axes and included angles in the cross isolation direction are set in the simulation, and the change of parameters is observed. The simulation results are shown in fig. 7. It can be seen that from 15GHz to 85GHz, all have polarization degradation characteristics, that is, have broadband characteristics, and by adjusting the cell tilt angle, the setting of polarization degradation parameters can be realized. And simulation shows that the vertical polarization penetration loss is less than 3 dB.
Example 2:
firstly, according to the simulation modeling of a pass-through polarization degradation board, a printed circuit board substrate in a simulation model is made of FR4 material, the FR4 material is a simpler periodic structure arrangement of elliptical units, the ratio of the long axis to the short axis of the ellipse is 4:1, the length of the short axis is 0.25 times of the wavelength of the applicable working frequency, a time domain finite difference method is used for simulation, incident polarization is vertical polarization, different included angles between the unit axis and the cross isolation direction are set in the simulation, and the change of parameters is observed. The simulation result of "vertical polarization coupling interference ratio" is shown in fig. 9. It can be seen that from 15GHz to 85GHz, all of which have polarization degradation characteristics, that is, have broadband characteristics, and by adjusting the cell tilt angle, the setting of the polarization coupling interference ratio can be realized.
The method and the device for testing the XPIC performance of the microwave transmission equipment provided by the embodiment of the application are described in detail above. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, 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 application.
As used in the specification and claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.

Claims (10)

1. An apparatus for testing XPIC performance of microwave transmission equipment, which is characterized in that the apparatus comprises:
the transmitting equipment and the receiving equipment to be tested are used for transmitting and receiving microwave signals;
the through type polarization degradation plate is arranged between the transmitting equipment and the receiving equipment and is used for carrying out degradation separation on the electromagnetic wave so as to separate the electromagnetic wave into two electromagnetic wave signals with different polarization directions;
a network performance analyzer V for measuring the reception power of the reception device in the vertical polarization direction;
a network performance analyzer H for measuring the receiving power of the receiving device in the horizontal polarization direction;
and calculating the polarization coupling interference ratio according to the measured received power, and analyzing the XPIC performance of the microwave transmission equipment.
2. The apparatus according to claim 1, further comprising a monitoring antenna M disposed on the transceiving path and a spectrometer connected to the monitoring antenna M, for measuring the transmission spectra in different polarization directions to determine whether the apparatus has a co-frequency XPIC function.
3. The apparatus for testing XPIC performance of microwave transmission equipment of claim 1, wherein the pass-through polarization degradation board comprises a dielectric board and metal units arranged on the surface of the dielectric board, and the metal units are arranged in a periodic array.
4. The apparatus for testing XPIC performance of microwave transmission equipment of claim 3, wherein the shape of the metallic elements is oval, parallelogram, trapezoid, figure "8" with an opening or any combination thereof.
5. The apparatus for testing XPIC performance of microwave transmission equipment according to claim 4, wherein the open figure "8" is specifically open at both ends; length L of "8" shaped metal uniteeLess than 0.5 lambdaminWidth WeeLess than 0.3 lambdaminWherein λ isminIs the minimum wavelength of the electromagnetic wave in the working frequency range of the metal unit.
6. A method for testing XPIC performance of microwave transmission equipment, characterized in that the method is implemented using the apparatus according to any of claims 1-5;
the methodComprises the following steps: s1, judging whether the current device meets the requirement of an XPIC performance test; if the condition is met, entering the next step, otherwise, judging again; s2, measuring the received power and calculating the polarization coupling interference ratio I of the test system of the test pass type polarization degradation boarda(ii) a Measuring received power and calculating to obtain vertical polarization coupling interference ratio I of adopted pass-through type polarization degradation plateVAnd a horizontally polarized coupling interference ratio IH(ii) a S3, coupling interference ratio I according to vertical polarizationVHorizontal polarization coupling interference ratio IHAnd the polarization coupling interference ratio I of the test system itselfaJudging whether the measurement result is credible or not according to the relation between the measurement result and the reference value, if so, entering the next step, and otherwise, returning to the step S2; and S4, using the pass-through polarization degradation board which is tested to determine the polarization coupling interference ratio parameter to test and judge whether the XPIC performance of the microwave transmission equipment is qualified.
7. The method for testing the XPIC performance of microwave transmission equipment of claim 6, wherein the criterion for judging the credibility of the measurement result in S3 is as follows: i isV-IaNot less than 3dB and IH-Ia≥3dB。
8. The method for testing the XPIC performance of microwave transmission equipment of claim 6, wherein the requirement that the current device in S1 meets the XPIC performance test is specifically as follows: and simultaneously, the conditions of maximum throughput ratio, packet loss rate and frequency spectrum are met.
9. The method for testing XPIC performance of microwave transmission equipment of claim 8, wherein the maximum throughput ratio condition is specifically: maximum throughput S of V channelVFAnd maximum throughput S of H channelHFThe ratio of the larger value to the smaller value is not more than 1.05;
the packet loss rate conditions are specifically as follows: the packet loss rates of the V channel and the H channel are both 0;
the frequency spectrum condition is specifically as follows: the emission spectrum of the V channel is completely overlapped with the emission spectrum of the H channel; the method for measuring the emission spectrum comprises the following steps: setting a monitoring antenna M to be in a vertical polarization mode, and measuring by using a frequency spectrograph to obtain a transmission frequency spectrum of a V channel; the monitoring antenna M is set to a horizontal polarization mode, and the transmission spectrum of the H channel is measured using a spectrometer.
10. The method for testing the XPIC performance of microwave transmission equipment of claim 7, wherein the criterion for judging the qualified XPIC performance of microwave transmission equipment in S4 is as follows: under the premise that the channel packet loss rate is 0 and the data rate is not reduced, the vertical polarization coupling interference ratio I used in the test isVOr horizontally polarized coupling interference ratio IHGreater than a threshold value related to the anti-interference performance of the digital modulation itself;
vertical polarization coupling interference ratio IVOr horizontally polarized coupling interference ratio IHThe higher the XPIC performance of the microwave transmission equipment to be tested, the better.
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