CN102546062B - 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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- CN102546062B CN102546062B CN201210042382.5A CN201210042382A CN102546062B CN 102546062 B CN102546062 B CN 102546062B CN 201210042382 A CN201210042382 A CN 201210042382A CN 102546062 B CN102546062 B CN 102546062B
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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 occurs that PIM (Passive Inter Modulation, passive intermodulation) problem can exert an influence to network performance, the PIM problem that therefore needs the antenna of finding in time and solve base station to occur; Wherein, the method that can adopt at present PIM to detect detects the power of PIM signal, determines according to the power of the PIM signal detecting the PIM problem that the antenna of base station occurs.
A kind of method that prior art provides PIM to detect, comprise: the power of the reception signal that base station receives its receive path scans, obtain receiving the power of signal, power to received signal carries out FFT (Fast Fourier Transformation, fast Fourier transform) computing obtains receiving and in signal, is positioned at the wide frequency spectrum of receiving belt, and carry out PIM and detect the power that obtains PIM signal being positioned at the wide frequency spectrum of receiving belt; And then whether there is PIM problem according to the antenna of the power determination base station of the PIM signal obtaining.
Realizing in process of the present invention, inventor finds that prior art at least exists following problem:
The power of PIM is less, directly carries out PIM to detect the precision of power of the PIM signal obtaining lower being positioned at the wide frequency spectrum of receiving belt.
Summary of the invention
In order to improve the precision of the power that detects PIM signal, the invention provides method, equipment and antenna that a kind of passive intermodulation detects.Described technical scheme is as follows:
The method that passive intermodulation PIM detects, described method comprises:
The first detection signal that receives base station transmitting obtains a PIM signal, and is converted into a digitized PIM signal from described the first detection signal;
Receive the transmitting of described base station, and through the second detection signal of described antenna for base station reflection, from described the second detection signal, obtain the 2nd PIM signal, and be converted into digitized the 2nd PIM signal;
A digitized described PIM signal and the 2nd PIM signal are carried out to cross-correlation cumulative, the power of the PIM signal that the second detection signal comprises described in the signal acquisition after cumulative according to cross-correlation.
The equipment that passive intermodulation PIM detects, described equipment comprises:
The first receiver module for receiving the first detection signal of base station transmitting, obtains a PIM signal, and is converted into a digitized PIM signal from described the first detection signal;
The second receiver module for receiving the transmitting of described base station, and through the second detection signal of described antenna for base station reflection, obtains the 2nd PIM signal, and is converted into digitized the 2nd PIM signal from described the second detection signal;
Acquisition module, cumulative for a digitized described PIM signal and the 2nd PIM signal being carried out to cross-correlation, the power of the PIM signal that the second detection signal comprises described in the signal acquisition after cumulative according to cross-correlation.
A kind of antenna, is characterized in that, described antenna comprises the equipment that antenna and described passive intermodulation PIM detect, and the equipment that described PIM detects is arranged on described antenna by main collection port.
In embodiments of the present invention, from the first detection signal of base station transmitting, obtain a PIM signal, from the 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 are carried out to the cumulative power that can improve PIM signal of cross-correlation, and the precision of the power of the PIM signal so comprising according to cumulative signal acquisition the second detection signal of cross-correlation is higher.
Accompanying drawing explanation
Fig. 1 is the method flow diagram that a kind of passive intermodulation that the embodiment of the present invention 1 provides detects;
Fig. 2 is the method flow diagram that a kind of passive intermodulation that the embodiment of the present invention 2 provides detects;
Fig. 3 is the position relationship schematic diagram of the embodiment of the present invention 2 antenna, checkout equipment and the base station that provide;
Fig. 4 is the oscillogram of the PIM signal that provides of the embodiment of the present invention 2;
Fig. 5 is the oscillogram of the 2nd PIM signal that provides of the embodiment of the present invention 2;
Fig. 6 is the oscillogram of the PIM signal of the stack that provides of the embodiment of the present invention 2;
Fig. 7 is the device structure schematic diagram that the first passive intermodulation of providing of the embodiment of the present invention 3 detects;
Fig. 8 is the device structure schematic diagram that the second passive intermodulation of providing of the embodiment of the present invention 3 detects;
Fig. 9 is the device structure schematic diagram that the third passive intermodulation that the embodiment of the present invention 3 provides detects;
Figure 10 is the device structure schematic diagram that the 4th kind of passive intermodulation that the embodiment of the present invention 3 provides detects;
Figure 11 is the structural representation of a kind of antenna of providing of the embodiment of the present invention 4.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
As shown in Figure 1, a kind of method that the embodiment of the present invention provides passive intermodulation to detect, comprising:
Step 101: receive the first detection signal of base station transmitting, obtain a PIM signal from the first detection signal, and be converted into a digitized PIM signal;
Step 102: the reflection of reception base station, and the second detection signal reflecting through antenna for base station, from the 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 to cross-correlation cumulative, the power of the PIM signal that signal acquisition the second detection signal after cumulative according to cross-correlation comprises.
In embodiments of the present invention, from the first detection signal of base station transmitting, obtain a PIM signal, from the 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 are carried out to the cumulative power that can improve PIM signal of cross-correlation, and the precision of the power of the PIM signal that signal acquisition the second detection signal after so adding up according to cross-correlation comprises is higher.
As shown in Figure 2, a kind of method that the embodiment of the present invention provides passive intermodulation to detect, comprising:
Step 201: checkout equipment receives the first detection signal of base station transmitting, obtains a PIM signal, and a PIM signal is converted to a digitized PIM signal from the first detection signal;
Wherein, referring to Fig. 3, checkout equipment is arranged on the antenna of base station by main collection port one, and antenna can be communicated by letter with checkout equipment by 485 interfaces of AISG agreement, and 485 interfaces that can pass through AISG (Antenna Interface Standards Group, antenna data interface) agreement are checkout equipment power supply; Checkout equipment can also be connected with base station by feeder line 2, and receives from feeder line 2 the first detection signal that base station sends.Wherein, in the present embodiment, checkout equipment and antenna are all the parts of base station.
Wherein, keeper can trigger base station and carry out PIM detection, then the number of users of base station real-time statistics current service, is less than default number of users if count the number of users of current service, calculates the frequency frequency location on three rank, five rank and seven rank according to armed two carrier waves; Be positioned at the wide frequency frequency location of receiving belt if existed, select 2 carrier waves as the first detection signal from being positioned at the frequency frequency location that reception bandwidth and exponent number are minimum, and with maximum power transmission the first detection signal.
Particularly, checkout equipment receives the first detection signal of base station transmitting, and the first detection signal is carried out to distortion amplification, extracts and be positioned at a PIM signal that receives bandwidth in the first detection signal from distortion is amplified; The one PIM signal is carried out to down-converted, the PIM signal after down-converted is carried out to filtering, filter out noise signal, then convert the PIM signal after filtering to a digitized PIM signal.
Wherein, it should be noted that: the first detection signal of base station transmitting is analog signal, so the PIM signal extracting in the first detection signal from distortion is amplified is also analog signal.
Step 202: checkout equipment reception base station transmitting, and the second detection signal reflecting through antenna for base station, from the second detection signal, obtain the 2nd PIM signal, and the 2nd PIM signal is converted to digitized the 2nd PIM signal;
Wherein, it should be noted that: when has launched after the first detection signal base station, through antenna for base station, reflection obtains the second detection signal to the first detection signal, and antenna for base station is connected by main collection port with checkout equipment, so checkout equipment can receive by main collection port the second detection signal of antenna for base station reflection.
Particularly, checkout equipment receives base station transmitting, and the second detection signal reflecting through antenna for base station, from the second detection signal, extract the 2nd PIM signal, the 2nd PIM signal extracting is carried out to linearity to be amplified, the 2nd PIM signal after linearity is amplified filters, filter out and be positioned at the 2nd PIM signal that receives bandwidth, the 2nd PIM signal after filtering is carried out to down-converted, the 2nd PIM signal after down-converted is carried out to filtering, filter out the noise in the 2nd PIM signal after down-converted, the 2nd PIM signal after filtering is converted to digitized the 2nd PIM signal.
Wherein, the second detection signal of antenna for base station reflection is analog signal, and the 2nd PIM signal extracting from the second detection signal is also analog signal.
Step 203: crest and the trough of the crest of a digitized PIM signal and trough and digitized the 2nd PIM signal are carried out registration process by checkout equipment;
Wherein, a PIM signal is a sine wave, and the 2nd PIM signal is also 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 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: checkout equipment superposes a PIM signal and the 2nd PIM signal after alignment, obtains the first stack PIM signal;
For example, a PIM signal as shown in Figure 4 and the 2nd PIM signal as shown in Figure 5 after alignment are superposeed, the crest that the crest comprising by a PIM signal 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, obtain 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; Described the first stack PIM signal and the second stack PIM signal are added up and obtain the first PIM signal that adds up;
Further, checkout equipment can arrange the initial value of accumulative frequency certificate, and for example, the initial value that accumulative frequency can be set is 1 etc., and in the present embodiment, the concrete body of the initial value to accumulative frequency does not limit.
Wherein, due to the power of PIM signal a little less than, be difficult to the power of direct-detection to PIM signal, and the precision of the power of the PIM signal that goes out of direct-detection is lower; If the first stack PIM signal of two strong correlations and the second stack PIM signal add up and obtain the first PIM signal that adds up, can increase the power of the first cumulative PIM signal and the SNR (Signal to Noise Ratio, signal to noise ratio) of the first cumulative PIM signal.
Wherein, in step 204, a PIM signal and the 2nd PIM signal are carried out to crest and trough registration process, so the crest of the first stack PIM signal obtaining and the second stack PIM signal and also alignment thereupon of trough.
Wherein, the first stack PIM signal obtains after superposeing by a digitized PIM signal and the 2nd PIM signal, the second stack PIM signal obtains after superposeing by 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 obtains the SNR of the first cumulative PIM signal, and the SNR obtaining is judged, if the SNR obtaining exceedes default SNR, performs step 207, if do not exceed default SNR, performs step 208;
Particularly, checkout equipment can directly detect the first cumulative PIM signal, to obtain the SNR of the first cumulative PIM signal, the SNR relatively obtaining and default SNR, if the SNR obtaining is less than or equal to default SNR, judge the SNR obtaining and do not exceed default SNR, otherwise, judge the SNR obtaining and exceed default SNR.
Step 207: checkout equipment detects the power of the first cumulative PIM signal, detect the power of the first cumulative PIM signal, calculate the power of the PIM signal that the second detection signal comprises by the detection model shown in following formula (1), end operation;
P＝Pt-20*logN……(1)；
Wherein, in formula (1), P is the power of the PIM signal that comprises of the second detection signal, and Pt is the power that detects the first cumulative PIM signal, and N is accumulative frequency.
Wherein, it should be noted that: if the SNR of the first cumulative PIM signal exceedes default SNR, show that the power of the first cumulative PIM signal is larger, can directly accurately be detected.
Wherein, checkout equipment can directly detect the power of the first cumulative PIM signal by existing PIM detection algorithm, obtains the power of the first cumulative PIM signal.
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 cumulative PIM signal are added up and obtain the second PIM signal that adds up;
Further, checkout equipment also increases accumulative frequency.
Step 209: if the SNR of the second cumulative PIM signal exceedes default SNR, checkout equipment detects the power of the second cumulative PIM signal, detect the power of the second cumulative PIM signal, calculate the power of the PIM signal that the second detection signal comprises by the detection model shown in formula (1), end operation.
Wherein, if the power of the second cumulative PIM signal does not exceed default SNR, repeat above-mentioned step 208, until the SNR of cumulative PIM signal is while exceeding default SNR, then detect the power of cumulative PIM signal, and calculate the power of the PIM signal that the second detection signal comprises by the detection model shown in formula (1).
Further, checkout equipment judges whether the power of the PIM signal that the second detection signal of the antenna for base station reflection calculating comprises is greater than default performance number, if so, detects antenna for base station and has PIM problem, if not, detects antenna for base station normal.
Wherein, in the present embodiment, checkout equipment can carry out work according to the sampling period, rising edge or lower liter in each sampling period prolong beginning executable operations, for example, checkout equipment obtains after a digitized PIM signal and the 2nd PIM signal, a rising edge of sampling the same period, the one PIM signal and the 2nd PIM signal are carried out to crest and trough registration process, in the rising edge in next sampling period, the one PIM signal and the 2nd PIM signal are superposeed and obtain the first stack PIM signal, in the rising in next sampling period, the one PIM signal and the 2nd PIM signal are superposeed and obtain the second stack PIM signal, and the first stack PIM signal and the second stack PIM signal add up and obtain the first PIM signal that adds up, and in the rising edge in next sampling period, the SNR of the first cumulative PIM signal is judged, if the SNR of the first cumulative PIM signal exceedes default SNR, detect the power of the first cumulative PIM signal, calculate the power of the PIM signal that the second detection signal of antenna for base station reflection comprises by the detection model shown in following formula (1).
In embodiments of the present invention, from the first detection signal of base station transmitting, obtain a PIM signal, from the 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 are superposeed and obtain the first stack PIM signal, again a PIM signal and the 2nd PIM signal are superposeed and obtain the second stack PIM signal, 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 to the cumulative power that can improve PIM signal of cross-correlation, the precision of the power of the PIM signal that the second detection signal of the signal acquisition antenna for base station reflection after so cumulative according to cross-correlation comprises is higher.
Embodiment 3
As shown in Figure 7, the equipment that the embodiment of the present invention provides a kind of passive intermodulation to detect, comprising:
The first receiver module 1 for receiving the first detection signal of base station transmitting, obtains a PIM signal, and is converted into a digitized PIM signal from the first detection signal;
The second receiver module 2 for receiving base station reflection, and through the second detection signal of antenna for base station reflection, obtains and is positioned at the 2nd PIM signal that receives bandwidth, and be converted into digitized the 2nd PIM signal from the second detection signal;
Acquisition module 3, cumulative for a digitized PIM signal and the 2nd PIM signal being carried out to cross-correlation, the power of the PIM signal that signal acquisition the second detection signal after cumulative according to cross-correlation comprises.
Wherein, referring to Fig. 8, the first receiver module 1 comprises:
The first receiving element 11, for receiving the first detection signal of base station transmitting, carries out distortion amplification to the first detection signal, extracts and be positioned at a PIM signal that receives bandwidth in the first detection signal from distortion is amplified;
The first converting unit 12, for carrying out down-converted to being positioned at the wide PIM signal of receiving belt, filters out the noise signal in the PIM signal after down-converted, then converts the PIM signal after filtering to a digitized PIM signal.
Further, referring to Fig. 9, the first receiving element 11 comprises:
The first coupler 111, distortion measurement 112 and the first filter 113;
The first coupler 111, for receiving the first detection signal of base station transmitting, and is transferred to distortion measurement 112 by the first detection signal;
Distortion measurement 112, for the first detection signal is carried out to distortion amplification, the first detection signal after then distortion being amplified is transferred to the first filter 113;
The first filter 113, extracts and is positioned at a PIM signal that receives bandwidth for the first detection signal from distortion is amplified, and a PIM signal is transferred to the first converting unit 112.
Further, referring to Fig. 9, the first converting unit 12 comprises:
The first frequency converter 121, the second filter 122 and the first conversion subelement 123;
The first frequency converter 121, the PIM signal transmitting for receiving the first filter 13 of the first receiving element 11, carries out down-converted to a PIM signal, and a PIM signal of down-converted is transferred to the second filter 122;
The second filter 122, filters for the PIM signal to down-converted, filters the noise signal in the PIM signal after down-converted, and the PIM signal after filtering is transferred to the first conversion subelement 123;
The first conversion subelement 123, for a PIM signal being converted to a digitized PIM signal, is transferred to acquisition module 3 by a digitized PIM signal.
Wherein, the first frequency converter 121 can be MIXER (frequency mixer), and first to change subelement 123 can be ADC (Analog-to-Digital Converter, A/D converter).
Wherein, referring to Fig. 8, the second receiver module 2 comprises:
The second receiving element 21, for receiving base station transmitting, and the second detection signal reflecting through antenna for base station, from the second detection signal, extract the 2nd PIM signal, the 2nd PIM signal is carried out to linearity and amplify, the 2nd PIM signal amplifying from linearity, filter out and be positioned at the 2nd PIM signal that receives bandwidth;
The second converting unit 22, for carrying out down-converted to being positioned at the 2nd wide PIM signal of receiving belt, the 2nd PIM signal to down-converted filters, and filters out the noise signal in the 2nd PIM signal, and the 2nd PIM signal after filtering is converted to digitized the 2nd PIM signal.
Further, referring to Fig. 9, the second receiving element 21 comprises:
The second coupler 211, the 3rd filter 212, linear amplifier 213 and the 4th filter 214;
The second coupler 211, for being coupled out base station transmitting, and through the second detection signal of antenna for base station reflection, is transferred to the 3rd filter 212 by the second detection signal;
The 3rd filter 212, for extract the 2nd PIM signal from the second detection signal, is transferred to linear amplifier 213 by the 2nd PIM signal;
The 4th filter 214, filters for the 2nd PIM signal after linearity is amplified, and filters out and is positioned at the 2nd PIM signal that receives bandwidth, and the 2nd PIM signal that is positioned at reception bandwidth is transferred to the second converting unit 22.
Further, referring to Fig. 9, the second converting unit 22 comprises:
The second frequency converter 221, the 5th filter 222 and the second conversion subelement 223;
The second frequency converter 221, be positioned at for the 4th filter 214 transmission that receive the second receiving element 21 the 2nd PIM signal that receives bandwidth, carry out down-converted to being positioned at the 2nd wide PIM signal of receiving belt, the 2nd PIM signal after down-converted is transferred to the 5th filter 222;
The 5th filter 222, for the 2nd PIM signal after down-converted is filtered, filters out the noise signal in the 2nd PIM signal after down-converted, and the 2nd PIM signal after filtering is transferred to the second conversion subelement 223;
The second conversion subelement 223, for the 2nd PIM signal after filtering is converted to digitized the 2nd PIM signal, and is transferred to acquisition module 3 by digitized the 2nd PIM signal.
Wherein, referring to Fig. 8, acquisition module 3 comprises:
Superpositing unit 31, for a digitized PIM signal being carried out to crest with the 2nd PIM signal and trough aligns, the one PIM signal and the 2nd PIM signal are superposeed and obtain the first stack PIM signal, a PIM signal and the 2nd PIM signal are superposeed and obtain the second stack PIM signal;
The first cumulative unit 32, for the first stack PIM signal and the second stack PIM signal are added up, obtains the first cumulative PIM signal;
The first computing unit 33, if the signal to noise ratio snr for the first cumulative PIM signal exceedes default SNR, detect the power of the first cumulative PIM signal, and calculate the power of the PIM signal that the second detection signal comprises by the detection model shown in formula (1);
P＝Pt-20*logN……(1)；
Wherein, in formula (1), P is the power of the PIM signal that comprises of the second detection signal, and Pt is the power of the first cumulative PIM signal, and N is accumulative frequency.
Further, acquisition module 3 also comprises:
The second cumulative unit 34, if the SNR for the first cumulative PIM signal does not exceed default SNR, 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 cumulative PIM signal are added up and obtain the second PIM signal that adds up;
The second computing unit 35, if the SNR for the second cumulative PIM signal exceedes default SNR, detect the power of the second cumulative PIM signal, and calculate the power of the PIM signal that the second detection signal comprises by the detection model shown in formula (1);
Wherein, if the power of the second cumulative PIM signal does not exceed default SNR, repeat the second cumulative unit 34, until the SNR of cumulative PIM signal is while exceeding default SNR, then the second computing unit 35, also for detection of the power that goes out cumulative PIM signal, and calculate the power of the PIM signal that the second detection signal comprises by the detection model shown in formula (1).
Further, referring to Figure 10, this equipment also comprises:
Transmitter module 4, for the number of users of accounting base-station current service, if the number of users of base station current service is less than default number of users, calculates the frequency frequency location on three rank, five rank and seven rank according to armed two carrier waves; Fall into if existed the frequency frequency location receiving in bandwidth, receive in bandwidth and frequency frequency location that exponent number is minimum selects 2 carrier waves as the first detection signal from falling into, and with maximum power transmission the first detection signal.
In embodiments of the present invention, from the first detection signal of base station transmitting, obtain a PIM signal, from the 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 are carried out to the cumulative power that can improve PIM signal of cross-correlation, and the precision of the power of the PIM signal that PIM signal acquisition the second detection signal after so adding up according to cross-correlation comprises is higher.
Embodiment 4
As shown in figure 11, the embodiment of the present invention provides a kind of antenna, comprising:
The equipment 402 that passive intermodulation PIM described in antenna 401 and embodiment 3 detects, the equipment 402 that PIM detects is arranged on antenna 401 by main collection port.
Wherein, antenna 401 is that the equipment 402 that PIM detects is powered and communicates by letter with the equipment 402 that PIM detects by 485 interfaces of AISG by 485 interfaces of AISG agreement.
One of ordinary skill in the art will appreciate that all or part of step that realizes above-described embodiment can complete by hardware, also can carry out the hardware that instruction is relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (17)
1. the method that passive intermodulation PIM detects, is characterized in that, described method comprises:
The first detection signal that receives base station transmitting obtains a PIM signal, and is converted into a digitized PIM signal from described the first detection signal;
Receive the transmitting of described base station, and through the second detection signal of described antenna for base station reflection, from described the second detection signal, obtain the 2nd PIM signal, and be converted into digitized the 2nd PIM signal;
A digitized described PIM signal and the 2nd PIM signal are carried out to cross-correlation cumulative, the power of the PIM signal that the second detection signal comprises described in the signal acquisition after cumulative according to cross-correlation.
2. the method for claim 1, is characterized in that, the first detection signal of described reception base station transmitting obtains a PIM signal, and is converted into a digitized PIM signal from described the first detection signal, comprising:
The first detection signal that receives base station transmitting, carries out distortion amplification to described the first detection signal, extracts and be positioned at a PIM signal that receives bandwidth in described the first detection signal from distortion is amplified;
A described PIM signal is carried out to down-converted, filter out the noise signal in the described PIM signal after down-converted, then convert the described PIM signal after filtering to a digitized PIM signal.
3. the method for claim 1, is characterized in that, described reception described base station transmitting, and the second detection signal reflecting through described antenna for base station, from described the second detection signal, obtain the 2nd PIM signal, and be converted into digitized the 2nd PIM signal, comprising:
Receive described base station transmitting, and the second detection signal reflecting through described antenna for base station, from described the second detection signal, extract the 2nd PIM signal, described the 2nd PIM signal is carried out to linearity and amplify, in described the 2nd PIM signal from linearity is amplified, filter out and be positioned at the 2nd PIM signal that receives bandwidth;
Carry out down-converted to being positioned at wide described the 2nd PIM signal of receiving belt, described the 2nd PIM signal after down-converted is filtered, filter out the noise signal in described the 2nd PIM signal after down-converted, described the 2nd PIM signal after filtering is converted to digitized the 2nd PIM signal.
4. the method for claim 1, is characterized in that, a digitized described PIM signal and the 2nd PIM signal is carried out to cross-correlation cumulative, and the power of the PIM signal that the second detection signal comprises described in the signal acquisition after cumulative according to cross-correlation, comprising:
A digitized described PIM signal is carried out to crest with the 2nd PIM signal and trough aligns, a digitized described PIM signal and the 2nd PIM signal are superposeed and obtain the first stack PIM signal;
A digitized described PIM signal and the 2nd PIM signal are superposeed and obtain the second stack PIM signal, described the first stack PIM signal and the second stack PIM signal are added up, obtain the first PIM signal that adds up;
If the signal to noise ratio snr of the described first cumulative PIM signal exceedes default SNR, detect the power of the described first cumulative PIM signal, and calculate the power of the PIM signal that described the second detection signal comprises by the detection model shown in formula (1);
P=Pt-20*logN……（1）；
Wherein, in formula (1), P is the power of the PIM signal that comprises of described the second detection signal, and Pt is the power of the described first cumulative PIM signal, and N is accumulative frequency.
5. method as claimed in claim 4, is characterized in that, described method also comprises:
If the SNR of the described first cumulative PIM signal does not exceed described default SNR, a digitized described PIM signal and the 2nd PIM signal are superposeed and obtain the 3rd stack PIM signal, the PIM signal that will described the 3rd stack PIM signal and described first adds up adds up and obtains the second PIM signal that adds up;
If the SNR of the described second cumulative PIM signal exceedes described default SNR, detect the power of the described second cumulative PIM signal, and calculate the power of the PIM signal that described the second detection signal comprises by the detection model shown in formula (1);
If the power of the described second cumulative PIM signal does not exceed default SNR, repeat above-mentioned steps, until the SNR of cumulative PIM signal is while exceeding default SNR, then detect the power of described cumulative PIM signal, and calculate the power of the PIM signal that described the second detection signal comprises by the detection model shown in formula (1).
6. the method as described in claim 1-5 any one claim, is characterized in that, before the first detection signal of described reception base station transmitting, also comprises:
Add up the number of users of described base station current service, if the number of users of described base station current service is less than default number of users, calculate the frequency frequency location on three rank, five rank and seven rank according to armed two carrier waves;
Fall into if existed the frequency frequency location receiving in bandwidth, receive in bandwidth and frequency frequency location that exponent number is minimum selects 2 carrier waves as the first detection signal from falling into, and with the first detection signal described in maximum power transmission.
7. the equipment that passive intermodulation PIM detects, is characterized in that, described equipment comprises:
The first receiver module for receiving the first detection signal of base station transmitting, obtains a PIM signal, and is converted into a digitized PIM signal from described the first detection signal;
The second receiver module for receiving the transmitting of described base station, and through the second detection signal of described antenna for base station reflection, obtains the 2nd PIM signal, and is converted into digitized the 2nd PIM signal from described the second detection signal;
Acquisition module, cumulative for a digitized described PIM signal and the 2nd PIM signal being carried out to cross-correlation, the power of the PIM signal that the second detection signal comprises described in the signal acquisition after cumulative according to cross-correlation.
8. equipment as claimed in claim 7, is characterized in that, described the first receiver module comprises:
The first receiving element, for receiving the first detection signal of base station transmitting, carries out distortion amplification to described the first detection signal, extracts and be positioned at a PIM signal that receives bandwidth in described the first detection signal from distortion is amplified;
The first converting unit, for a described PIM signal is carried out to down-converted, filters out the noise signal in the described PIM signal after down-converted, then converts the described PIM signal after filtering to a digitized PIM signal.
9. equipment as claimed in claim 8, is characterized in that, described the first receiving element comprises:
The first coupler, distortion measurement and the first filter;
Described the first coupler, for being coupled out the first detection signal of base station transmitting, and is transferred to described distortion measurement by described the first detection signal;
Described distortion measurement, for described the first detection signal is carried out to distortion amplification, described the first detection signal after distortion is amplified is transferred to described the first filter;
Described the first filter, extracts and is positioned at a PIM signal that receives bandwidth for described the first detection signal from distortion is amplified, and a described PIM signal is transferred to described the first converting unit.
10. equipment as claimed in claim 8 or 9, is characterized in that, described the first converting unit comprises:
The first frequency converter, the second filter and the first conversion subelement;
Described the first frequency converter, the PIM signal transmitting for receiving the first filter of described the first receiving element, carries out down-converted to a described PIM signal, and the described PIM signal after down-converted is transferred to described the second filter;
Described the second filter, for the described PIM signal after down-converted is filtered, filters the noise signal in the described PIM signal after down-converted, and the described PIM signal after filtering is transferred to described the first conversion subelement;
Described the first conversion subelement, for the described PIM signal after filtering is converted to a digitized PIM signal, is transferred to described acquisition module by a digitized described PIM signal.
11. equipment as claimed in claim 7, is characterized in that, described the second receiver module comprises:
The second receiving element, for receiving described base station transmitting, and the second detection signal reflecting through described antenna for base station, from described the second detection signal, extract the 2nd PIM signal, described the 2nd PIM signal is carried out to linearity and amplify, in described the 2nd PIM signal from linearity is amplified, filter out and be positioned at the 2nd PIM signal that receives bandwidth;
The second converting unit, for carrying out down-converted to being positioned at wide described the 2nd PIM signal of receiving belt, described the 2nd PIM signal after down-converted is filtered, filter out the noise signal in described the 2nd PIM signal, described the 2nd PIM signal after filtering is converted to digitized the 2nd PIM signal.
12. equipment as claimed in claim 11, is characterized in that, described the second receiving element comprises:
The second coupler, the 3rd filter, linear amplifier and the 4th filter;
Described the second coupler, for receiving the transmitting of described base station, and through the second detection signal of described antenna for base station reflection, is transferred to described the 3rd filter by described the second detection signal;
Described the 3rd filter, for extracting the 2nd PIM signal from described the second detection signal, is transferred to described linear amplifier by described the 2nd PIM signal;
Described linear amplifier, amplifies for described the 2nd PIM signal being carried out to linearity, and described the 2nd PIM signal after linearity amplification is transferred to described the 4th filter;
Described the 4th filter, filters for described the 2nd PIM signal after linearity is amplified, and filters out and is positioned at described the 2nd PIM signal that receives bandwidth, and described the 2nd PIM signal that is positioned at reception bandwidth is transferred to described the second converting unit.
13. equipment as described in claim 11 or 12, is characterized in that, described the second converting unit comprises:
The second frequency converter, the 5th filter and the second conversion subelement;
Described the second frequency converter, be positioned at for the 4th filter transmission that receives described the second receiving element the 2nd PIM signal that receives bandwidth, carry out down-converted to being positioned at wide described the 2nd PIM signal of receiving belt, described the 2nd PIM signal after down-converted is transferred to described the 5th filter;
Described the 5th filter, for described the 2nd PIM signal after down-converted is filtered, filters out the noise signal in described the 2nd PIM signal after down-converted, and described the 2nd PIM signal after filtering is transferred to described the second conversion subelement;
Described the second conversion subelement, for described the 2nd PIM signal after filtering is converted to digitized the 2nd PIM signal, and is transferred to described acquisition module by digitized described the 2nd PIM signal.
14. equipment as claimed in claim 7, is characterized in that, described acquisition module comprises:
Superpositing unit, for a digitized described PIM signal being carried out to crest with the 2nd PIM signal and trough aligns, a digitized described PIM signal and the 2nd PIM signal are superposeed and obtain the first stack PIM signal, a digitized described PIM signal and the 2nd PIM signal are superposeed and obtain the second stack PIM signal;
The first cumulative unit, for described the first stack PIM signal and the second stack PIM signal are added up, obtains the first cumulative PIM signal;
The first computing unit, if the signal to noise ratio snr for the described first cumulative PIM signal exceedes default SNR, detect the power of the described first cumulative PIM signal, and calculate the power of the PIM signal that described the second detection signal comprises by the detection model shown in formula (1);
P=Pt-20*logN……（1）；
Wherein, in formula (1), P is the power of the PIM signal that comprises of described the second detection signal, and Pt is the power of the described first cumulative PIM signal, and N is accumulative frequency.
15. equipment as claimed in claim 14, is characterized in that, described acquisition module also comprises:
The second cumulative unit, if the SNR for the described first cumulative PIM signal does not exceed described default SNR, a described PIM signal and the 2nd PIM signal are superposeed and obtain the 3rd stack PIM signal, the PIM signal that will described the 3rd stack PIM signal and described first adds up adds up and obtains the second PIM signal that adds up;
The second computing unit, if the SNR for the described second cumulative PIM signal exceedes described default SNR, detect the power of the described second cumulative PIM signal, and calculate the power of the PIM signal that described the second detection signal comprises by the detection model shown in formula (1);
Wherein, if the power of the described second cumulative PIM signal does not exceed default SNR, repeat the described second cumulative unit, until the SNR of cumulative PIM signal is while exceeding default SNR, then described the second computing unit, also for detection of the power that goes out described cumulative PIM signal, and calculate the power of the PIM signal that described the second detection signal comprises by the detection model shown in formula (1).
16. as claim 7, and the equipment described in 8,9,11 or 12, is characterized in that, described equipment also comprises:
Transmitter module, for adding up the number of users of described base station current service, if the number of users of described base station current service is less than default number of users, calculates the frequency frequency location on three rank, five rank and seven rank according to armed two carrier waves; Fall into if existed the frequency frequency location receiving in bandwidth, receive in bandwidth and frequency frequency location that exponent number is minimum selects 2 carrier waves as the first detection signal from falling into, and with the first detection signal described in maximum power transmission.
17. 1 kinds of antennas, is characterized in that, described antenna comprises the equipment that antenna and the passive intermodulation PIM as described in claim 7-13 any one claim detect, and the equipment that described PIM detects is arranged on described antenna by main collection port.
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| WO2014085345A1 (en) * | 2012-11-30 | 2014-06-05 | P-Wave Holdings, Llc | Built-in passive intermodulation detector for base station equipment |
| CN104244311B (en) * | 2013-06-09 | 2017-09-15 | 中国移动通信集团公司 | The passive intermodulation testing method and device of antenna-feedback system |
| CN105356952B (en) * | 2015-09-30 | 2019-01-18 | 上海华为技术有限公司 | A kind of passive intermodulation detection device and method |
| US20170141938A1 (en) * | 2015-11-12 | 2017-05-18 | Futurewei Technologies, Inc. | High Performance PIM Cancellation With Feed Forward Structure |
| CN110518991A (en) * | 2019-07-30 | 2019-11-29 | 武汉虹信通信技术有限责任公司 | Passive intermodulation self-sensing method and device |
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