CN102546062A - Passive inter-modulation detecting method and equipment as well as antenna - Google Patents
Passive inter-modulation detecting method and equipment as well as antenna Download PDFInfo
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- CN102546062A CN102546062A CN2012100423825A CN201210042382A CN102546062A CN 102546062 A CN102546062 A CN 102546062A CN 2012100423825 A CN2012100423825 A CN 2012100423825A CN 201210042382 A CN201210042382 A CN 201210042382A CN 102546062 A CN102546062 A CN 102546062A
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Abstract
The invention discloses a passive inter-modulation detecting method and equipment as well as an antenna, belonging to the communication field. The passive inter-modulation detecting method comprises the following steps: receiving a first detection signal transmitted by a base station, obtaining a first PIM (Personal Information Management) signal from the first detection signal, and converting the first PIM signal to a digitalized first PIM signal; receiving a transmitted second detection signal which is reflected by a base station antenna, so as to obtain a second PIM signal from the second detection signal, and converting the second PIM signal into a digitalized second PIM signal; carrying out cross-correlation accumulation on the digitalized first PIM signal and second PIM signal, and obtaining power of the second detection signal including a PIM signal according to a cross-correlation accumulated signal. The passive inter-modulation detecting equipment comprises a first receiving module, a second receiving module and an obtaining module. According to the passive inter-modulation detecting method and equipment disclosed by the invention, the precision of detecting the power of the PIM signal can be improved.
Description
Technical field
The present invention relates to the communications field, method, equipment and antenna that particularly a kind of passive intermodulation detects.
Background technology
In communication network, the antenna of base station PIM (Passive Inter Modulation, passive intermodulation) problem occurs and can exert an influence to network performance, the PIM problem that therefore needs the timely antenna of finding and solve the base station to occur; Wherein, the method that can adopt PIM to detect at present detects the power of PIM signal, confirms the PIM problem that the antenna of base station occurs according to the power of detected PIM signal.
The method that prior art provides a kind of PIM to detect; Comprise: the base station is scanned the power of the reception signal that its receive path receives; Obtain receiving the power of signal; Power to received signal carries out FFT (Fast Fourier Transformation, fast Fourier transform) computing and obtains receiving the frequency spectrum that is positioned at the reception bandwidth in the signal, carries out the power that the PIM detection obtains the PIM signal to being positioned at the frequency spectrum that receives bandwidth; And then confirm according to the power of the PIM signal that obtains whether the antenna of base station the PIM problem occurs.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:
The power of PIM is less, directly carries out PIM to detect the precision of power of the PIM signal that obtains lower being positioned at the frequency spectrum that receives bandwidth.
Summary of the invention
In order to improve the precision of the power that detects the PIM signal, the invention provides method, equipment and antenna that a kind of passive intermodulation detects.Said technical scheme is following:
The method that a kind of passive intermodulation PIM detects, said method comprises:
Receive first detection signal of base station, from said first detection signal, obtain a PIM signal, and be converted into a digitized PIM signal;
Receive said base station, and, from said second detection signal, obtain the 2nd PIM signal, and be converted into digitized the 2nd PIM signal through second detection signal of said antenna for base station reflection;
A digitized said PIM signal and the 2nd PIM signal are carried out cross-correlation add up, the signal after adding up according to cross-correlation obtains the power of the PIM signal that said second detection signal comprises.
The equipment that a kind of passive intermodulation PIM detects, said equipment comprises:
First receiver module is used to receive first detection signal of base station, from said first detection signal, obtains a PIM signal, and is converted into a digitized PIM signal;
Second receiver module is used to receive said base station, and through second detection signal of said antenna for base station reflection, from said second detection signal, obtains the 2nd PIM signal, and be converted into digitized the 2nd PIM signal;
Acquisition module is used for that a digitized said PIM signal and the 2nd PIM signal are carried out cross-correlation and adds up, and the signal after adding up according to cross-correlation obtains the power of the PIM signal that said second detection signal comprises.
A kind of antenna is characterized in that, said antenna comprises the equipment that antenna and described passive intermodulation PIM detect, and the equipment that said PIM detects is installed on the said antenna through main collection port.
In embodiments of the present invention; From first detection signal of base station, obtain a PIM signal; From second detection signal of antenna for base station reflection, obtain the 2nd PIM signal; The one PIM signal and the 2nd PIM signal are two strong correlation signals, a PIM signal and the 2nd PIM signal are carried out cross-correlation add up and can improve the power of PIM signal, and it is higher that the signal that so adds up according to cross-correlation obtains the precision of power of the PIM signal that second detection signal comprises.
Description of drawings
Fig. 1 is the method flow diagram that a kind of passive intermodulation that the embodiment of the invention 1 provides detects;
Fig. 2 is the method flow diagram that a kind of passive intermodulation that the embodiment of the invention 2 provides detects;
Fig. 3 is that the position of the embodiment of the invention 2 antenna, checkout equipment and the base station that provide concerns sketch map;
Fig. 4 is the oscillogram of the PIM signal that provides of the embodiment of the invention 2;
Fig. 5 is the oscillogram of the 2nd PIM signal that provides of the embodiment of the invention 2;
Fig. 6 is the oscillogram of the PIM signal of the stack that provides of the embodiment of the invention 2;
Fig. 7 is the device structure sketch map that first kind of passive intermodulation that the embodiment of the invention 3 provides detects;
Fig. 8 is the device structure sketch map that second kind of passive intermodulation that the embodiment of the invention 3 provides detects;
Fig. 9 is the device structure sketch map that the third passive intermodulation that the embodiment of the invention 3 provides detects;
Figure 10 is the device structure sketch map that the 4th kind of passive intermodulation that the embodiment of the invention 3 provides detects;
Figure 11 is the structural representation of a kind of antenna of providing of the embodiment of the invention 4.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.
Method as shown in Figure 1, that the embodiment of the invention provides a kind of passive intermodulation to detect comprises:
Step 101: receive first detection signal of base station, from first detection signal, obtain a PIM signal, and be converted into a digitized PIM signal;
Step 102: the reflection of reception base station, and through second detection signal that antenna for base station reflects, from second detection signal, obtain the 2nd PIM signal, and be converted into digitized the 2nd PIM signal;
Step 103: a digitized PIM signal and the 2nd PIM signal are carried out cross-correlation add up, the signal after adding up according to cross-correlation obtains the power of the PIM signal that comprises in second detection signal.
In embodiments of the present invention; From first detection signal of base station, obtain a PIM signal; From second detection signal of antenna for base station reflection, obtain the 2nd PIM signal; The one PIM signal and the 2nd PIM signal are two strong correlation signals, a PIM signal and the 2nd PIM signal are carried out cross-correlation add up and can improve the power of PIM signal, and it is higher that the signal after so adding up according to cross-correlation obtains the precision of power of the PIM signal that second detection signal comprises.
Method as shown in Figure 2, that the embodiment of the invention provides a kind of passive intermodulation to detect comprises:
Step 201: checkout equipment receives first detection signal of base station, from first detection signal, obtains a PIM signal, and is a digitized PIM signal with a PIM conversion of signals;
Wherein, Referring to Fig. 3; Checkout equipment is installed on the antenna of base station through main collection port one; And antenna can be communicated by letter with checkout equipment through 485 interfaces of AISG agreement, and 485 interfaces that can pass through AISG (Antenna Interface Standards Group, antenna data interface) agreement are the checkout equipment power supply; Checkout equipment can also link to each other with the base station through feeder line 2, and receives first detection signal that send the base station from feeder line 2.Wherein, in the present embodiment, checkout equipment and antenna all are the parts of base station.
Wherein, The keeper can trigger the base station and carry out the PIM detection; The number of users of base station real-time statistics current service then is if the number of users that counts current service then calculates the frequency frequency location on three rank, five rank and seven rank less than preset number of users according to armed two carrier waves; Be positioned at the frequency frequency location that receives bandwidth if exist, then select 2 carrier waves as first detection signal from being positioned at the minimum frequency frequency location of reception bandwidth and exponent number, and with maximum power transmission first detection signal.
Particularly, checkout equipment receives first detection signal of base station, first detection signal is carried out distortion amplify, and extracts first detection signal after distortion is amplified to be positioned at a PIM signal that receives bandwidth; The one PIM signal is carried out down-converted, the PIM signal after the down-converted is carried out filtering, filter out noise signal, the PIM conversion of signals after will filtering again becomes a digitized PIM signal.
Wherein, need to prove: first detection signal of base station is an analog signal, so a PIM signal that extracts first detection signal after distortion is amplified also is analog signal.
Step 202: checkout equipment receives base station, and through second detection signal of antenna for base station reflection, from second detection signal, obtains the 2nd PIM signal, and is digitized the 2nd PIM signal with the 2nd PIM conversion of signals;
Wherein, Need to prove: behind intact first detection signal of base station; Reflection obtains second detection signal to first detection signal through antenna for base station; And antenna for base station links to each other through main collection port with checkout equipment, so checkout equipment can receive second detection signal of antenna for base station reflection through main collection port.
Particularly, checkout equipment reception base station, and second detection signal of process antenna for base station reflection; From second detection signal, extract the 2nd PIM signal; The 2nd PIM signal to extracting carries out linear amplification, and the 2nd PIM signal behind the linear amplification is filtered, and filters out to be positioned at the 2nd PIM signal that receives bandwidth; The 2nd PIM signal to after filtering carries out down-converted; The 2nd PIM signal to after the down-converted carries out filtering, filters out the noise in the 2nd PIM signal after the down-converted, is digitized the 2nd PIM signal with the 2nd PIM conversion of signals after filtering.
Wherein, second detection signal of antenna for base station reflection is an analog signal, and the 2nd PIM signal that from second detection signal, extracts also is analog signal.
Step 203: checkout equipment carries out registration process with the crest of a digitized PIM signal and the crest and the trough of trough and digitized the 2nd PIM signal;
Wherein, a PIM signal is a sine wave, and the 2nd PIM signal also is a sine wave, and life period skew between a PIM signal and the 2nd PIM signal; For example, a PIM signal as shown in Figure 4 and the 2nd PIM signal as shown in Figure 5, life period skew between a PIM signal and the 2nd PIM signal; Checkout equipment can carry out registration process to the crest and the trough of the crest of a PIM signal as shown in table 4 and trough and the 2nd PIM signal as shown in Figure 5, to eliminate the time migration between a PIM signal and the 2nd PIM signal.
Step 204: a PIM signal and the 2nd PIM signal after checkout equipment will align superpose, and obtain the first stack PIM signal;
For example; PIM signal that the alignment back is as shown in Figure 4 and the 2nd PIM signal as shown in Figure 5 superpose; Being about to the crest that crest that a PIM signal comprises and the 2nd PIM signal comprise superposes; And the trough that the trough that a PIM signal is comprised and the 2nd PIM signal comprise superposes, and obtains the first stack PIM signal as shown in Figure 6.
Step 205: checkout equipment superposes a PIM signal and the 2nd PIM signal, obtains the second stack PIM signal; The said first stack PIM signal and the second PIM signal that superposes is added up and obtains the first PIM signal that adds up;
Further, checkout equipment can be provided with the initial value of accumulative frequency certificate, and for example, the initial value that accumulative frequency can be set is 1 etc., in the present embodiment, the concrete body of the initial value of accumulative frequency is not done qualification.
Wherein and since the power of PIM signal a little less than, be difficult to directly detect the power of PIM signal, and the precision of the power of direct detected PIM signal is lower; Obtain the first PIM signal that adds up if the first stack PIM signal of two strong correlations and the second stack PIM signal added up; Can increase by first add up the PIM signal the add up SNR (Signal to Noise Ratio, signal to noise ratio) of PIM signal of power and first.
Wherein, a PIM signal and the 2nd PIM signal are carried out crest and trough registration process, so the crest of the first stack PIM signal that obtains and the second stack PIM signal and also alignment thereupon of trough in step 204.
Wherein, The first stack PIM signal obtains after superposeing through a digitized PIM signal and the 2nd PIM signal; The second stack PIM signal obtains after superposeing through a digitized PIM signal and the 2nd PIM signal, so the first stack PIM signal and the second stack PIM signal are two signals that signal power is identical.
Step 206: checkout equipment obtain first add up the PIM signal SNR, and the SNR that obtains judged if the SNR that obtains surpasses preset SNR, then execution in step 207, if surpass preset SNR, then execution in step 208;
Particularly; Checkout equipment can be directly detects the first PIM signal that adds up, with obtain first add up the PIM signal SNR, SNR that relatively obtains and preset SNR; If the SNR that obtains is less than or equal to preset SNR; Then judge the SNR that obtains and do not surpass preset SNR, otherwise, judge the SNR that obtains and surpass preset SNR.
Step 207: checkout equipment to first add up the PIM signal power detect, detect first add up the PIM signal power, calculate the power of the PIM signal that second detection signal comprises, end operation by the detection model shown in the following formula (1);
P＝Pt-20*logN……(1)；
Wherein, in formula (1), P is the power of the PIM signal that comprises of second detection signal, Pt be detect first add up the PIM signal power, N is an accumulative frequency.
Wherein, need to prove: if first add up the PIM signal SNR surpass preset SNR, show that then first the add up power of PIM signal is bigger, can directly accurately be detected.
Wherein, checkout equipment can be directly through existing P IM detection algorithm to first add up the PIM signal power detect, obtain first add up the PIM signal power.
Step 208: checkout equipment superposes a PIM signal and the 2nd PIM signal, obtains the 3rd stack PIM signal, and the 3rd stack PIM signal and the first PIM signal that adds up is added up and obtains the second PIM signal that adds up;
Further, checkout equipment also increases accumulative frequency.
Step 209: if second add up the PIM signal SNR surpass preset SNR; Then checkout equipment to second add up the PIM signal power detect; Detect second add up the PIM signal power; By formula the detection model shown in (1) calculates the power of the PIM signal that second detection signal comprises, end operation.
Wherein, If second add up the PIM signal power surpass preset SNR; Then repeat above-mentioned step 208; Till when the SNR of the PIM signal that adds up surpasses preset SNR, detect the power of the PIM signal that adds up then, and calculate the power of the PIM signal that second detection signal comprises through the detection model shown in the formula (1).
Further, whether checkout equipment judges the power of the PIM signal that second detection signal of the antenna for base station reflection calculate comprises greater than preset performance number, if, then detect antenna for base station and have the PIM problem, if not, it is normal then to detect antenna for base station.
Wherein, In the present embodiment; Checkout equipment can carry out work according to the sampling period, the rising in each sampling period prolong or under rise and prolong the beginning executable operations, for example; After checkout equipment obtains a digitized PIM signal and the 2nd PIM signal; Rising sampling same period is prolonged, and a PIM signal and the 2nd PIM signal are carried out crest and trough registration process, prolongs a PIM signal and the 2nd PIM signal superposeed in the rising in next one sampling period to obtain the first PIM signal that superposes; In the rising in next sampling period the one PIM signal and the 2nd PIM signal are superposeed and to obtain the second stack PIM signal; And the first stack PIM signal and the second stack PIM signal added up obtain the first PIM signal that adds up, and the rising in next sampling period prolong to first add up the PIM signal SNR judge, if first add up the PIM signal SNR surpass the SNR that presets; Then detect first add up the PIM signal power, calculate the power of the PIM signal that second detection signal of antenna for base station reflection comprises by the detection model shown in the following formula (1).
In embodiments of the present invention; From first detection signal of base station, obtain a PIM signal; From second detection signal of antenna for base station reflection, obtain the 2nd PIM signal; The one PIM signal and the 2nd PIM signal are two strong correlation signals; The one PIM signal and the 2nd PIM signal superposeed obtains the first stack PIM signal, and a PIM signal and the 2nd PIM signal are superposeed obtains the second stack PIM signal again, and the first stack PIM signal and the second stack PIM signal are two strong correlation signals; The first stack PIM signal and the second stack PIM signal are carried out cross-correlation add up and can improve the power of PIM signal, it is higher that the signal after so adding up according to cross-correlation obtains the precision of power of the PIM signal that second detection signal of antenna for base station reflection comprises.
Embodiment 3
Equipment as shown in Figure 7, that the embodiment of the invention provides a kind of passive intermodulation to detect comprises:
Acquisition module 3 is used for that a digitized PIM signal and the 2nd PIM signal are carried out cross-correlation and adds up, and the signal after adding up according to cross-correlation obtains the power of the PIM signal that second detection signal comprises.
Wherein, referring to Fig. 8, first receiver module 1 comprises:
First receiving element 11 is used to receive first detection signal of base station, first detection signal is carried out distortion amplify, and extracts first detection signal after distortion is amplified to be positioned at a PIM signal that receives bandwidth;
First converting unit 12 is used for carrying out down-converted to being positioned at a PIM signal that receives bandwidth, filters out the noise signal in the PIM signal after the down-converted, and the PIM conversion of signals after will filtering again becomes a digitized PIM signal.
Further, referring to Fig. 9, first receiving element 11 comprises:
First coupler 111, distortion measurement 112 and first filter 113;
First coupler 111 is used to receive first detection signal of base station, and first detection signal is transferred to distortion measurement 112;
Distortion measurement 112 is used for that first detection signal is carried out distortion and amplifies, and first detection signal after then distortion being amplified is transferred to first filter 113;
First filter 113, first detection signal after being used for amplifying from distortion extracts and is positioned at a PIM signal that receives bandwidth, and a PIM signal is transferred to first converting unit 112.
Further, referring to Fig. 9, first converting unit 12 comprises:
First frequency converter 121, second filter 122 and the first conversion subelement 123;
First frequency converter 121 is used to receive a PIM signal of first filter, 13 transmission of first receiving element 11, a PIM signal is carried out down-converted, and a PIM signal of down-converted is transferred to second filter 122;
Second filter 122 is used for a PIM signal of down-converted is filtered, and the noise signal in the PIM signal after the filtration down-converted is transferred to the first conversion subelement 123 with the PIM signal after filtering;
The first conversion subelement 123, being used for a PIM conversion of signals is a digitized PIM signal, and a digitized PIM signal is transferred to acquisition module 3.
Wherein, first frequency converter 121 can be MIXER (frequency mixer), and the first conversion subelement 123 can be ADC (Analog-to-Digital Converter, A/D converter).
Wherein, referring to Fig. 8, second receiver module 2 comprises:
Second receiving element 21; Be used to receive base station; And second detection signal of process antenna for base station reflection; From second detection signal, extract the 2nd PIM signal, the 2nd PIM signal is carried out linear amplification, from the 2nd PIM signal of linear amplification, filter out the 2nd PIM signal that is positioned at the reception bandwidth;
Second converting unit 22; Be used for carrying out down-converted to being positioned at the 2nd PIM signal that receives bandwidth; The 2nd PIM signal to down-converted filters, and filters out the noise signal in the 2nd PIM signal, is digitized the 2nd PIM signal with the 2nd PIM conversion of signals after filtering.
Further, referring to Fig. 9, second receiving element 21 comprises:
The 3rd filter 212 is used for extracting the 2nd PIM signal from second detection signal, and the 2nd PIM signal is transferred to linear amplifier 213;
The 4th filter 214 is used for the 2nd PIM signal behind the linear amplification is filtered, and filters out to be positioned at the 2nd PIM signal that receives bandwidth, will be positioned at the 2nd PIM signal that receives bandwidth and be transferred to second converting unit 22.
Further, referring to Fig. 9, second converting unit 22 comprises:
Second frequency converter 221, the 5th filter 222 and the second conversion subelement 223;
Second frequency converter 221; The 4th filter 214 transmission that are used to receive second receiving element 21 are positioned at the 2nd PIM signal that receives bandwidth; Carry out down-converted to being positioned at the 2nd PIM signal that receives bandwidth, the 2nd PIM signal after the down-converted is transferred to the 5th filter 222;
The 5th filter 222 is used for the 2nd PIM signal after the down-converted is filtered, and filters out the noise signal in the 2nd PIM signal after the down-converted, and the 2nd PIM signal after filtering is transferred to the second conversion subelement 223;
The second conversion subelement 223, being used for the 2nd PIM conversion of signals after filtering is digitized the 2nd PIM signal, and digitized the 2nd PIM signal is transferred to acquisition module 3.
Wherein, referring to Fig. 8, acquisition module 3 comprises:
Superpositing unit 31; Be used for a digitized PIM signal is carried out crest with the 2nd PIM signal and trough aligns; The one PIM signal and the 2nd PIM signal superposeed obtains the first stack PIM signal, and a PIM signal and the 2nd PIM signal are superposeed obtains the second PIM signal that superposes;
First unit 32 that adds up is used for the first stack PIM signal and the second PIM signal that superposes is added up, and obtains the first PIM signal that adds up;
First computing unit 33, if be used for first add up the PIM signal signal to noise ratio snr surpass preset SNR, then detect first add up the PIM signal power, and calculate the power of the PIM signal that second detection signal comprises through the detection model shown in the formula (1);
P＝Pt-20*logN……(1)；
Wherein, in formula (1), P is the power of the PIM signal that comprises of second detection signal, Pt be first add up the PIM signal power, N is an accumulative frequency.
Further, acquisition module 3 also comprises:
Second unit 34 that adds up; If be used for first add up the PIM signal SNR surpass preset SNR; Then a PIM signal and the 2nd PIM signal are superposeed and obtain the 3rd stack PIM signal, the 3rd stack PIM signal and the first PIM signal that adds up is added up and obtains the second PIM signal that adds up;
Second computing unit 35, if be used for second add up the PIM signal SNR surpass preset SNR, then detect second add up the PIM signal power, and calculate the power of the PIM signal that second detection signal comprises through the detection model shown in the formula (1);
Wherein, If second add up the PIM signal power surpass preset SNR; Then repeat second unit 34 that adds up, when the SNR of the PIM signal that adds up surpasses preset SNR till, second computing unit 35 then; Also be used to detect the power of the PIM signal that adds up, and calculate the power of the PIM signal that second detection signal comprises through the detection model shown in the formula (1).
Further, referring to Figure 10, this equipment also comprises:
Transmitter module 4 is used for the number of users of accounting base-station current service, if the number of users of base station current service less than preset number of users, then calculates the frequency frequency location on three rank, five rank and seven rank according to armed two carrier waves; Fall into the frequency frequency location that receives in the bandwidth if exist, then to receive in the bandwidth and frequency frequency location that exponent number is minimum selects 2 carrier waves as first detection signal from falling into, and with maximum power transmission first detection signal.
In embodiments of the present invention; From first detection signal of base station, obtain a PIM signal; From second detection signal of antenna for base station reflection, obtain the 2nd PIM signal; The one PIM signal and the 2nd PIM signal are two strong correlation signals, a PIM signal and the 2nd PIM signal are carried out cross-correlation add up and can improve the power of PIM signal, and it is higher that the PIM signal after so adding up according to cross-correlation obtains the precision of power of the PIM signal that second detection signal comprises.
Embodiment 4
Shown in figure 11, the embodiment of the invention provides a kind of antenna, comprising:
The equipment 402 of antenna 401 and embodiment 3 described passive intermodulation PIM detections, the equipment 402 that PIM detects is installed on the antenna 401 through main collection port.
Wherein, antenna 401 is that equipment 402 power supplies of PIM detection and 485 interfaces that pass through AISG are communicated by letter with the equipment 402 that PIM detects through 485 interfaces of AISG agreement.
The all or part of step that one of ordinary skill in the art will appreciate that realization the foregoing description can be accomplished through hardware; Also can instruct relevant hardware to accomplish through program; Described program can be stored in a kind of computer-readable recording medium; The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (17)
1. the method that detects of a passive intermodulation PIM is characterized in that said method comprises:
Receive first detection signal of base station, from said first detection signal, obtain a PIM signal, and be converted into a digitized PIM signal;
Receive said base station, and, from said second detection signal, obtain the 2nd PIM signal, and be converted into digitized the 2nd PIM signal through second detection signal of said antenna for base station reflection;
A digitized said PIM signal and the 2nd PIM signal are carried out cross-correlation add up, the signal after adding up according to cross-correlation obtains the power of the PIM signal that said second detection signal comprises.
2. the method for claim 1 is characterized in that, first detection signal of said reception base station obtains a PIM signal from said first detection signal, and is converted into a digitized PIM signal, comprising:
Receive first detection signal of base station, said first detection signal is carried out distortion amplify, extract a PIM signal that is positioned at the reception bandwidth said first detection signal after distortion is amplified;
A said PIM signal is carried out down-converted, filter out the noise signal in the said PIM signal after the down-converted, the said PIM conversion of signals after will filtering again becomes a digitized PIM signal.
3. the method for claim 1 is characterized in that, the said base station of said reception; And second detection signal of the said antenna for base station reflection of process; From said second detection signal, obtain the 2nd PIM signal, and be converted into digitized the 2nd PIM signal, comprising:
Receive said base station; And second detection signal of the said antenna for base station reflection of process; From said second detection signal, extract the 2nd PIM signal; Said the 2nd PIM signal is carried out linear amplification, filter out the 2nd PIM signal that is positioned at the reception bandwidth said the 2nd PIM signal behind linear amplification;
Carry out down-converted to being positioned at said the 2nd PIM signal that receives bandwidth; Said the 2nd PIM signal to after the down-converted filters; Filtering out the noise signal in said the 2nd PIM signal after the down-converted, is digitized the 2nd PIM signal with said the 2nd PIM conversion of signals after filtering.
4. the method for claim 1; It is characterized in that; Saidly a digitized said PIM signal and the 2nd PIM signal are carried out cross-correlation add up, the signal after adding up according to cross-correlation obtains the power of the PIM signal that said second detection signal comprises, comprising:
A digitized said PIM signal is carried out crest with the 2nd PIM signal and trough aligns, and a digitized said PIM signal and the 2nd PIM signal are superposeed obtains the first stack PIM signal;
A digitized said PIM signal and the 2nd PIM signal superposeed obtains the second stack PIM signal, and the PIM signal that will the said first stack PIM signal and second superposes adds up, and obtains the first PIM signal that adds up;
If said first add up the PIM signal signal to noise ratio snr surpass preset SNR, then detect said first add up the PIM signal power, and calculate the power of the PIM signal that said second detection signal comprises through the detection model shown in the formula (1);
P＝Pt-20*logN……(1)；
Wherein, in formula (1), P is the power of the PIM signal that comprises of said second detection signal, Pt be said first add up the PIM signal power, N is an accumulative frequency.
5. method as claimed in claim 4 is characterized in that, said method also comprises:
If said first add up the PIM signal SNR surpass said preset SNR; Then a digitized said PIM signal and the 2nd PIM signal are superposeed and obtain the 3rd stack PIM signal, the PIM signal and said first that will the said the 3rd the superposes PIM signal that adds up adds up and obtains the second PIM signal that adds up;
If said second add up the PIM signal SNR surpass said preset SNR, then detect said second add up the PIM signal power, and calculate the power of the PIM signal that said second detection signal comprises through the detection model shown in the formula (1);
If said second add up the PIM signal power surpass preset SNR; Then repeat above-mentioned steps; Till when the SNR of the PIM signal that adds up surpasses preset SNR; Detect the power of the said PIM signal that adds up then, and calculate the power of the PIM signal that said second detection signal comprises through the detection model shown in the formula (1).
6. like the described method of each claim of claim 1-5, it is characterized in that, before first detection signal of said reception base station, also comprise:
Add up the number of users of said base station current service, if the number of users of said base station current service less than preset number of users, then calculates the frequency frequency location on three rank, five rank and seven rank according to armed two carrier waves;
Fall into the frequency frequency location that receives in the bandwidth if exist, then to receive in the bandwidth and frequency frequency location that exponent number is minimum selects 2 carrier waves as first detection signal from falling into, and with said first detection signal of maximum power transmission.
7. the equipment that detects of a passive intermodulation PIM is characterized in that said equipment comprises:
First receiver module is used to receive first detection signal of base station, from said first detection signal, obtains a PIM signal, and is converted into a digitized PIM signal;
Second receiver module is used to receive said base station, and through second detection signal of said antenna for base station reflection, from said second detection signal, obtains the 2nd PIM signal, and be converted into digitized the 2nd PIM signal;
Acquisition module is used for that a digitized said PIM signal and the 2nd PIM signal are carried out cross-correlation and adds up, and the signal after adding up according to cross-correlation obtains the power of the PIM signal that said second detection signal comprises.
8. equipment as claimed in claim 7 is characterized in that, said first receiver module comprises:
First receiving element is used to receive first detection signal of base station, said first detection signal is carried out distortion amplify, and extracts said first detection signal after distortion is amplified to be positioned at a PIM signal that receives bandwidth;
First converting unit is used for a said PIM signal is carried out down-converted, filters out the noise signal in the said PIM signal after the down-converted, and the said PIM conversion of signals after will filtering again becomes a digitized PIM signal.
9. equipment as claimed in claim 8 is characterized in that, said first receiving element comprises:
First coupler, distortion measurement and first filter;
Said first coupler, first detection signal of the base station that is used to be coupled out, and said first detection signal is transferred to said distortion measurement;
Said distortion measurement is used for that said first detection signal is carried out distortion and amplifies, and said first detection signal after distortion is amplified is transferred to said first filter;
Said first filter, said first detection signal after being used for amplifying from distortion extracts and is positioned at a PIM signal that receives bandwidth, and a said PIM signal is transferred to said first converting unit.
10. like claim 8 or 9 described equipment, it is characterized in that said first converting unit comprises:
First frequency converter, second filter and the first conversion subelement;
Said first frequency converter is used to receive a PIM signal of first filter transmission of said first receiving element, a said PIM signal is carried out down-converted, and the said PIM signal after the down-converted is transferred to said second filter;
Said second filter is used for the said PIM signal after the down-converted is filtered, and the noise signal in the said PIM signal after the filtration down-converted is transferred to the said first conversion subelement with the said PIM signal after filtering;
The said first conversion subelement, being used for the said PIM conversion of signals after filtering is a digitized PIM signal, and a digitized said PIM signal is transferred to said acquisition module.
11. equipment as claimed in claim 7 is characterized in that, said second receiver module comprises:
Second receiving element; Be used to receive said base station; And second detection signal of the said antenna for base station reflection of process; From said second detection signal, extract the 2nd PIM signal, said the 2nd PIM signal is carried out linear amplification, filter out the 2nd PIM signal that is positioned at the reception bandwidth said the 2nd PIM signal behind linear amplification;
Second converting unit; Be used for carrying out down-converted to being positioned at said the 2nd PIM signal that receives bandwidth; Said the 2nd PIM signal to after the down-converted filters; Filtering out the noise signal in said the 2nd PIM signal, is digitized the 2nd PIM signal with said the 2nd PIM conversion of signals after filtering.
12. equipment as claimed in claim 11 is characterized in that, said second receiving element comprises:
Second coupler, the 3rd filter, linear amplifier and the 4th filter;
Said second coupler is used to receive said base station, and through second detection signal of said antenna for base station reflection, said second detection signal is transferred to said the 3rd filter;
Said the 3rd filter is used for extracting the 2nd PIM signal from said second detection signal, and said the 2nd PIM signal is transferred to said linear amplifier;
Said linear amplifier is used for said the 2nd PIM signal is carried out linear amplification, and said the 2nd PIM signal behind the linear amplification is transferred to said the 4th filter;
Said the 4th filter is used for said the 2nd PIM signal behind the linear amplification is filtered, and filters out to be positioned at said the 2nd PIM signal that receives bandwidth, will be positioned at said the 2nd PIM signal that receives bandwidth and be transferred to said second converting unit.
13., it is characterized in that said second converting unit comprises like claim 11 or 12 described equipment:
Second frequency converter, the 5th filter and the second conversion subelement;
Said second frequency converter; The 4th filter transmission that is used to receive said second receiving element is positioned at the 2nd PIM signal that receives bandwidth; Carry out down-converted to being positioned at said the 2nd PIM signal that receives bandwidth, said the 2nd PIM signal after the down-converted is transferred to said the 5th filter;
Said the 5th filter is used for said the 2nd PIM signal after the down-converted is filtered, and filters out the noise signal in said the 2nd PIM signal after the down-converted, and said the 2nd PIM signal after filtering is transferred to the said second conversion subelement;
The said second conversion subelement, being used for said the 2nd PIM conversion of signals after filtering is digitized the 2nd PIM signal, and digitized said the 2nd PIM signal is transferred to said acquisition module.
14. equipment as claimed in claim 7 is characterized in that, said acquisition module comprises:
Superpositing unit; Be used for a digitized said PIM signal is carried out crest with the 2nd PIM signal and trough aligns; A digitized said PIM signal and the 2nd PIM signal superposeed obtains the first stack PIM signal, will a digitized said PIM signal and the 2nd PIM signal superpose and obtain the second PIM signal that superposes;
First unit that adds up is used for the said first stack PIM signal and the second PIM signal that superposes is added up, and obtains the first PIM signal that adds up;
First computing unit; If be used for said first add up the PIM signal signal to noise ratio snr surpass preset SNR; Then detect said first add up the PIM signal power, and calculate the power of the PIM signal that said second detection signal comprises through the detection model shown in the formula (1);
P＝Pt-20*logN……(1)；
Wherein, in formula (1), P is the power of the PIM signal that comprises of said second detection signal, Pt be said first add up the PIM signal power, N is an accumulative frequency.
15. equipment as claimed in claim 14 is characterized in that, said acquisition module also comprises:
Second unit that adds up; If be used for said first add up the PIM signal SNR surpass said preset SNR; Then a said PIM signal and the 2nd PIM signal are superposeed and obtain the 3rd stack PIM signal, the PIM signal and said first that will the said the 3rd the superposes PIM signal that adds up adds up and obtains the second PIM signal that adds up;
Second computing unit; If be used for said second add up the PIM signal SNR surpass said preset SNR; Then detect said second add up the PIM signal power, and calculate the power of the PIM signal that said second detection signal comprises through the detection model shown in the formula (1);
Wherein, If said second add up the PIM signal power surpass preset SNR; Then repeat said second unit that adds up, when the SNR of the PIM signal that adds up surpasses preset SNR till, said then second computing unit; Also be used to detect the power of the said PIM signal that adds up, and calculate the power of the PIM signal that said second detection signal comprises through the detection model shown in the formula (1).
16., it is characterized in that said equipment also comprises like the described equipment of each claim of claim 7-13-:
Transmitter module is used to add up the number of users of said base station current service, if the number of users of said base station current service less than preset number of users, then calculates the frequency frequency location on three rank, five rank and seven rank according to armed two carrier waves; Fall into the frequency frequency location that receives in the bandwidth if exist, then to receive in the bandwidth and frequency frequency location that exponent number is minimum selects 2 carrier waves as first detection signal from falling into, and with said first detection signal of maximum power transmission.
17. an antenna is characterized in that, said antenna comprises antenna and the equipment that detects like the described passive intermodulation PIM of each claim of claim 7-13, and the equipment that said PIM detects is installed on the said antenna through main collection port.
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| CN102546062B (en) | 2014-06-04 |
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