CN101657010B - Assessment method and device of intermodulation interference - Google Patents
Assessment method and device of intermodulation interference Download PDFInfo
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- CN101657010B CN101657010B CN2009101737743A CN200910173774A CN101657010B CN 101657010 B CN101657010 B CN 101657010B CN 2009101737743 A CN2009101737743 A CN 2009101737743A CN 200910173774 A CN200910173774 A CN 200910173774A CN 101657010 B CN101657010 B CN 101657010B
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Abstract
The invention discloses an assessment method and a device of intermodulation interference. The method comprises the steps: dividing the UMTS broad band bandwidth of a universal mobile communication system into a plurality of UMTS narrowband bandwidths with the same size according to the Global System Mobile communication (GSM) bandwidth; computing power on an MTS narrowband bandwidth; computing intermodulation distortion according to the power; computing an intermodulation product according to the power and the intermodulation distortion; judging whether the intermodulation product falls on the bandwidth of a system to be assessed or not; computing the intermodulation interference according to the intermodulation product falling on the bandwidth of the system to be assessed and determining the influence of the system to be assessed according to the intermodulation interference. The invention avoids the intermodulation interference and ensures the safe operation of the system.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of appraisal procedure and device of Intermodulation Interference.
Background technology
At global system for mobile communications (Global System of Mobile communication; Abbreviate GSM as) and Universal Mobile Telecommunications System (Universal MobileTelecommunications System; Abbreviate UMTS as) in (that is, GU mixes modular system), mix modular system base station (Base Transceiver Station; Abbreviate BTS as) can in transmitter of descending use and a power amplifier, send GSM and UMTS carrier frequency; Sharing on this hardware can reduce BTS system equipment cost largely, and the while is the frequency of utilization resource more effectively, considerable economic benefit.
But when GSM and two different frequency signals of UMTS act on same nonlinear circuit, they will intermodulate and produce second order intermodulation distortion (IntermodulationDistortion), third order intermodulation distortion etc.Wherein, comprise that the most intermodulation distortion of second order intermodulation distortion can be filtered, but when two frequency values of input signal very near the time, thereby third order intermodulation distortion will be not easy to be filtered near two fundamental frequencies very much.The third order intermodulation frequency that two concurrent carrier frequency f1 that close on, f2 produce for (2f1-f2) and (2f2-f1); If this frequency just in time is positioned at GSM, UMTS or other wireless telecommunication system operation of receiver channel width; Then will cause interference, i.e. Intermodulation Interference to this receiver.
Fig. 1 is the sketch map that produces inter-modulated signal according to the unequal power signal of correlation technique, and is as shown in Figure 1, when two interfering signal powers are unequal, and frequency f
1Interference power be P
1, frequency f
2Interference power be P
2, the intermodulation product of generation is at frequency (2f
1-f
2), (2f
2-f
1) size located is respectively P
31, P
32Suppose that intermodulation distortion is IMD3, then IMD3=P
1+ P
2-2 * IIP3 (IIP3 is the equipment IIP 3).Therefore, the emission intermodulation product watt level of representing with index IMD3 is P
31=P
1-IMD3, P
32=P
2-IMD3.
Fig. 2 is the sketch map that produces the Intermodulation Interference scene according to the transmitter of correlation technique, and as shown in Figure 2, BTS1 possibly belong to different operators with BTS2, BTS1 and mobile device MS1 communication, and mixed modular system BTS2 of GU and MS2, MS3 are through the communication simultaneously of a transmitter; MS1 is away from BTS1 simultaneously, and MS2, MS3 are away from BTS2, and MS1 is near BTS2.
In Fig. 2, suppose that GU mixes GSM use carrier frequency f2 in the modular system transmitter, UMTS uses carrier frequency f3; GSM is identical with the UMTS carrier bandwidths; (f2, the Intermodulation Interference signal frequency that f3) produces just equals the receive frequency f1 of MS1 to two carrier frequency, thereby has influenced the MS1 receiver sensitivity.On the one hand, because MS2, MS3 are away from BTS2, so BTS2 will send in f2, f3 frequency full power; On the other hand, because MS1 is away from BTS1, so that MS1 receives the downstream signal of BTS1 is very little.Like this, if mix third order intermodulation that modular system BTS2 produces than the high H dB of thermal noise (H depends on the requirement of interfered with system to safe class) in the MS1 receiver place band, think then that this third order intermodulation is disturbed communication system has been caused influence by GU.
Fig. 3 is according to the GSM of correlation technique and UMTS spectrum distribution sketch map, and as shown in Figure 3, GSM is the narrow band signal of 200kHz, and UMTS is a broadband signal, and their carrier bandwidths does not satisfy the said GSM hypothesis identical with the UMTS carrier bandwidths.Therefore, need a kind of method, assess the Intermodulation Interference of the signal generation of different carrier bandwidth.
Summary of the invention
Propose the present invention to the problem that can not assess the Intermodulation Interference that the different carrier bandwidth signal produces, for this reason, main purpose of the present invention is to provide a kind of GU to mix the evaluation scheme of modular system Intermodulation Interference, to address the above problem.
To achieve these goals; According to an aspect of the present invention; A kind of appraisal procedure of Intermodulation Interference is provided; This method comprises: according to global mobile communication GSM bandwidth Universal Mobile Telecommunications System UMTS broadband width is divided into the identical UMTS narrow band bandwidth of a plurality of sizes, and calculates the power on the UMTS narrow band bandwidth; According to the power calculation intermodulation distortion, and according to power and intermodulation distortion calculating intermodulation product; Judge whether intermodulation product falls on the system under evaluation bandwidth, and calculate Intermodulation Interference according to the intermodulation product that falls on the system under evaluation bandwidth; Confirm influence according to Intermodulation Interference to system under evaluation.
Preferably, the size of UMTS narrow band bandwidth and GSM bandwidth is big or small identical.
Preferably, if the UMTS broadband width is not the integral multiple of GSM bandwidth, then from the UMTS broadband width, gets the maximum integer of GSM bandwidth and doubly divide.
Preferably, intermodulation distortion comprises according to power calculation: IMD3=P1+A-2 * IIP3 wherein, IMD3 is intermodulation distortion, P1 is a GSM carrier transmit power, A is a power, IIP3 is the equipment IIP 3.
Preferably, comprise according to power and intermodulation distortion calculating intermodulation product: if the third order intermodulation signal center frequency is 2f0-f
M, then the size of intermodulation product is that GSM carrier transmit power deducts the difference that intermodulation distortion obtains, wherein, M=1,2 ..., 19; If the third order intermodulation signal center frequency is 2f
M-f0, then the size of intermodulation product deducts the difference that intermodulation distortion obtains for power, wherein, and M=1,2 ..., 19.
Preferably, calculating Intermodulation Interference according to intermodulation product comprises: Intermodulation Interference is for suing for peace and deduct the value that path loss obtains again falling into intermodulation product on the system under evaluation bandwidth.
Preferably, confirm the influence of system under evaluation is comprised according to Intermodulation Interference: calculate the difference of the thermal noise in Intermodulation Interference and the system under evaluation receiver band, and judge the influence of confirming system under evaluation according to difference.
Preferably, confirm the influence of system under evaluation is comprised according to Intermodulation Interference: if difference surpasses predetermined threshold, then confirm system under evaluation has been caused influence, otherwise, confirm system under evaluation is not impacted.
Preferably, above-mentioned system under evaluation comprises: gsm system, UMTS system, CDMA2000 system, TD-SCDMA system, LTE system.
To achieve these goals, according to a further aspect in the invention, a kind of apparatus for evaluating of Intermodulation Interference is provided, this device comprises: divide module, be used for according to the GSM bandwidth UMTS broadband width being divided into the identical UMTS narrow band bandwidth of a plurality of sizes; First computing module is used to calculate the power on the UMTS narrow band bandwidth of dividing Module Division; Second computing module is used for according to the power calculation intermodulation distortion; The 3rd calculates module, is used for calculating intermodulation product according to power and intermodulation distortion; Judge module is used to judge whether intermodulation product falls into the system under evaluation bandwidth; The 4th computing module is used for calculating Intermodulation Interference according to the intermodulation product that falls on the system under evaluation bandwidth; Determination module is used for confirming the influence to system under evaluation according to Intermodulation Interference.
Through the present invention; Employing is divided into the UMTS narrow band bandwidth with the UMTS broadband width; Produce intermodulation product with the GSM bandwidth respectively; Assess GU and mix the scheme of modular system base station side Intermodulation Interference, solved the problem that to assess the Intermodulation Interference that the different carrier bandwidth signal produces, and then evaded Intermodulation Interference, guaranteed the system safety operation the UMTS systematic influence.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the sketch map that produces inter-modulated signal according to the unequal power signal of correlation technique;
Fig. 2 is the sketch map that produces the Intermodulation Interference scene according to the transmitter of correlation technique;
Fig. 3 is according to the GSM of correlation technique and UMTS spectrum distribution sketch map;
Fig. 4 is the flow chart according to the Intermodulation Interference appraisal procedure of the embodiment of the invention;
Fig. 5 divides the frequency sketch map according to the GSM of the embodiment of the invention and UMTS;
Fig. 6 is the detail flowchart according to the Intermodulation Interference appraisal procedure of the embodiment of the invention;
Fig. 7 is the structured flowchart according to the apparatus for evaluating of the Intermodulation Interference of the embodiment of the invention;
Fig. 8 is the preferred structure block diagram according to the apparatus for evaluating of the Intermodulation Interference of the embodiment of the invention.
Embodiment
Functional overview
Consider the problem of the Intermodulation Interference that can not assess the generation of different carrier bandwidth signal in the correlation technique; The present invention proposes a kind of according to GSM and UMTS carrier wave characteristics; The UMTS broadband width is divided into the UMTS narrow band bandwidth; Produce intermodulation product with the GSM bandwidth respectively, assess GU and mix of the influence of modular system base station side Intermodulation Interference system under evaluation.
Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.Below with reference to accompanying drawing and combine embodiment to specify the present invention.
Method embodiment
According to embodiments of the invention, a kind of appraisal procedure of Intermodulation Interference is provided.Fig. 4 is the flow chart according to the Intermodulation Interference appraisal procedure of the embodiment of the invention, and is as shown in Figure 4, and this method comprises that following step S402 is to step S408.
Step S402: according to the GSM bandwidth UMTS broadband width is divided into the identical UMTS narrow band bandwidth of a plurality of sizes, and calculates the power on the UMTS narrow band bandwidth.
Wherein, the size of UMTS narrow band bandwidth is big or small identical with the GSM bandwidth, if the UMTS broadband width is not the integral multiple of GSM bandwidth, then from the UMTS broadband width, obtains the maximum integer of GSM bandwidth and doubly divides.
Step S404: according to the power calculation intermodulation distortion on the UMTS narrow band bandwidth, and according to power on the UMTS narrow band bandwidth and intermodulation distortion calculating intermodulation product.
Can calculate intermodulation distortion: IMD3=P1+A-2 * IIP3 through following formula
Wherein, IMD3 is intermodulation distortion, and P1 is a GSM carrier transmit power, and A is the power on the UMTS narrow band bandwidth, and IIP3 is the equipment IIP 3.
Simultaneously, the aforementioned calculation intermodulation product comprises following two kinds of situation:
Situation one: if the third order intermodulation signal center frequency is 2f0-f
M, then the size of intermodulation product is that GSM carrier transmit power deducts the difference that intermodulation distortion obtains, wherein, M=1,2 ..., 19.
Situation two: if the third order intermodulation signal center frequency is 2f
M-f0, then the size of intermodulation product is that power on the UMTS narrow band bandwidth deducts the difference that intermodulation distortion obtains, wherein, and M=1,2 ..., 19.
Step S406: judge whether intermodulation product falls on the system under evaluation bandwidth, and calculate Intermodulation Interference according to the intermodulation product that falls on the system under evaluation bandwidth.
The method of calculating Intermodulation Interference can be: sue for peace and deduct the value that path loss obtains again falling into intermodulation product on the system under evaluation bandwidth.
Step S408: confirm influence to system under evaluation according to Intermodulation Interference.Particularly, can comprise following two steps:
(1) difference of the thermal noise in calculating Intermodulation Interference and the system under evaluation receiver band.
(2) if difference surpasses predetermined threshold, then confirm system under evaluation has been caused influence, otherwise, confirm system under evaluation is not impacted.
The evaluation scheme of the Intermodulation Interference of present embodiment is carried out detailed explanation below in conjunction with above-mentioned steps S402 to step S408.
Fig. 5 divides the frequency sketch map according to the GSM of the embodiment of the invention and UMTS, and is as shown in Figure 5, supposes that GSM carrier transmit power is P1 (dBm), and transmission center frequency values is f0, and carrier bandwidths is 200kHz; UMTS carrier transmit power is P2 (dBm), and transmission center frequency values is F, and carrier bandwidths is 3.84MHz.
Fig. 6 is the flow chart according to the Intermodulation Interference assessment of the embodiment of the invention, and is as shown in Figure 6, comprises that following step S602 is to step S610.
Step S602; Be above-mentioned steps S402; Consider big or small identical (being 200kHz) of size with the GSM bandwidth of UMTS narrow band bandwidth, simultaneously, because UMTS broadband width 3.84MHz is not the integral multiple of GSM bandwidth 200kHz; So the maximum integer of from the UMTS broadband width, getting the GSM bandwidth doubly (promptly 19) is divided, and is 3.8MHz thereby get the UMTS broadband width.Therefore, above-mentioned each UMTS narrow band bandwidth is 200kHz, supposes that again the centre frequency of its signal is respectively f
1, f
2... f
19, then fi=F-3.8/2+ (2i-1) * 0.2/2 (i=1,2 ..., 19).Therefore, the power on each UMTS narrow band bandwidth (being above-mentioned A) is P2-10 * 1g (19)=P2-12.8 (dBm).
Step S604, i.e. above-mentioned steps S404, according to the IIP3 of equipment, i.e. equipment IIP 3, the intermodulation distortion IMD3=P1+P2-12.8-2 * IIP3 (dBm) when input signal is P1 (dBm) and P2-12.8 (dBm).
Step S606, i.e. above-mentioned steps S404,19 narrow band signals of UMTS produce intermodulation product with the GSM signal respectively, and the third order intermodulation signal center frequency of generation is respectively 2f0-f
MAnd 2f
M-f0 (M=1,2 ..., 19), bandwidth is 200kHz.If centre frequency is 2f0-f
M(M=1,2 ..., 19), then the intermodulation product size is P31=P1-IMD3 (dBm); If centre frequency is 2f
M-f0 (M=1,2 ..., 19), then the intermodulation product size is P32=P2-12.8-IMD3 (dBm).
Step S608; Be above-mentioned steps S406; Judge respectively whether 2 * 19 inter-modulated signal fall on the system under evaluation receiver reception carrier bandwidth, deduct path loss L again and be the Intermodulation Interference that receiver receives falling into the summation of the individual intermodulation product size of the P (0≤P＜19) that receives on the bandwidth.
Step S610; Be above-mentioned steps S408; Thermal noise in above-mentioned Intermodulation Interference signal and the system under evaluation receiver band is compared; Judge whether comparative result has surpassed H dB (H depends on that the safe class of interfered with system requires) if think that then this Intermodulation Interference signal has caused influence to communication system to be assessed, otherwise think communication system to be assessed is not impacted.
Need to prove that above-mentioned described system under evaluation can include but not limited to gsm system, UMTS system, CDMA2000 system, TD-SCDMA system, LTE system, other communication system all should be included within protection scope of the present invention.
To combine instance that the implementation procedure of the embodiment of the invention is described in detail below.
Embodiment 1
Assessment GU mixes the influence of modular system base station side Intermodulation Interference to gsm system.Be described in detail below in conjunction with the flow process of Fig. 6 implementation this embodiment.
S602 is said like step, supposes that GSM carrier transmit power is 43dBm, and frequency is 900MHz; UMTS carrier transmit power is 43dBm, and centre frequency is 902.6MHz.The UMTS broadband width is divided into 19 UMTS narrow band bandwidth, and the centre frequency of each narrow band signal is respectively 900.8,901 ..., 904.4MHz, then the power on each UMTS narrow band bandwidth is 43-10 * 1g (19)=30.2dBm.
S604 is said like step, according to the IIP3 of equipment, i.e. and equipment IIP 3, the intermodulation distortion IMD3=43+30.2-2 * IIP3=73.2-2 * IIP3 (dBm) when input signal is 43dBm and 30.2dBm.
S606 is said like step, and 19 narrow band signals of UMTS produce intermodulation product with the GSM signal respectively, and the inter-modulated signal centre frequency of generation is respectively 899.2,899 ..., 895.6MHz and 901.6,901.8 ..., 908.8MHz, the inter-modulated signal bandwidth is 200kHz.If centre frequency is 899.2,899 ..., 895.6MHz, then the intermodulation product size is P31=43-IMD3 (dBm), if centre frequency is 901.6,901.8 ..., 908.8MHz, then the intermodulation product size is P32=30.2-IMD3 (dBm).
S608 is said like step; If GSM mobile station receiver reception carrier centre frequency is 899.6MHz; Because carrier bandwidths is the same with the inter-modulated signal bandwidth; So judge respectively whether 2 * 19 intermodulation products fall on the GSM mobile station receiver reception carrier frequency (bandwidth), deduct path loss L and be the Intermodulation Interference that receiver receives falling into an intermodulation product size on the reception bandwidth.
S610 is said like step; Thermal noise in above-mentioned Intermodulation Interference signal and the GSM receiver band is compared; Judge whether comparative result has surpassed 5.87dB (the gsm system receiver sensitivity worsens 1dB); If then think the GSM communication system has been caused influence, otherwise think the GSM communication system is not impacted.
Embodiment 2
Assessment GU mixes the influence of modular system base station side Intermodulation Interference to the UMTS system, is described in detail below in conjunction with the flow process of Fig. 6 implementation to this embodiment.
S602 is said like step, supposes that GSM carrier transmit power is 43dBm, and frequency is 900MHz, and UMTS carrier transmit power is 43dBm, and centre frequency is 902.6MHz.The UMTS broadband width is divided into 19 UMTS narrow band bandwidth, and the centre frequency of each narrow band signal is respectively 900.8,901 ..., 904.4MHz, then the power on each UMTS narrow band bandwidth is 43-10 * 1g (19)=30.2dBm.
S604 is said like step, according to the IIP3 of equipment, i.e. and equipment IIP 3, the intermodulation distortion IMD3=43+30.2-2 * IIP3=73.2-2 * IIP3 (dBm) when input signal is 43dBm and 30.2dBm.
S606 is said like step, and 19 narrow band signals of UMTS produce intermodulation product with the GSM signal respectively, and the inter-modulated signal centre frequency of generation is respectively 899.2,899 ..., 895.6MHz and 901.6,901.8 ..., 908.8MHz, the inter-modulated signal bandwidth is 200kHz.If centre frequency is 899.2,899 ..., 895.6MHz, then the intermodulation product size is P31=43-IMD3 (dBm), if centre frequency is 901.6,901.8 ..., 908.8MHz, then the intermodulation product size is P32=30.2-IMD3 (dBm).
S608 is said like step; Judge respectively whether 2 * 19 inter-modulated signal fall on the UMTS mobile station receiver 3.84MHz reception carrier bandwidth, with 15 intermodulation products (901.6,901.8 that fall on the receiver reception carrier bandwidth; ...; 904.4MHz) summation, then the intermodulation product of transmitting terminal size is 30.2-IMD3+10 * 1g (15)=42-IMD3 (dBm), this intermodulation product size is deducted path loss L be the Intermodulation Interference that receiver receives.
S610 is said like step; Thermal noise in above-mentioned Intermodulation Interference signal and the UMTS receiver band is compared; Judge whether comparative result has surpassed 5.87dB (sensitivity of UMTS system receiver worsens 1dB); If then think the UMTS communication system has been caused influence, otherwise think the UMTS communication system is not impacted.
Embodiment 3
Assessment GU mixes the influence of modular system base station side Intermodulation Interference to other system, is described in detail below in conjunction with the flow process of Fig. 6 implementation to this embodiment.
S602 is said like step, supposes that GSM carrier transmit power is 43dBm, and frequency is 900MHz; UMTS carrier transmit power is 43dBm, and centre frequency is 902.6MHz.The UMTS broadband width is divided into 19 UMTS narrow band bandwidth, and the centre frequency of each narrow band signal is respectively 900.8,901 ..., 904.4MHz, then the power on each UMTS narrow band bandwidth is 43-10 * 1g (19)=30.2dBm.
S604 is said like step, according to the IIP3 of equipment, i.e. and equipment IIP 3, the intermodulation distortion IMD3=43+30.2-2 * IIP3=73.2-2 * IIP3 (dBm) when input signal is 43dBm and 30.2dBm.
S606 is said like step, and 19 narrow band signals of UMTS produce intermodulation product with the GSM signal respectively, and the inter-modulated signal centre frequency of generation is respectively 899.2,899; ..., 895.6MHz and 901.6,901.8 ...; 908.8MHz the inter-modulated signal bandwidth is 200kHz, if centre frequency is 899.2,899; ..., 895.6MHz, then the intermodulation product size is P31=43-IMD3 (dBm), if centre frequency is 901.6; 901.8 ..., 908.8MHz, then the intermodulation product size is P32=30.2-IMD3 (dBm).
S608 is said like step; Suppose that system under evaluation travelling carriage reception carrier bandwidth is 895MHz～896.1MHz; Judge respectively whether 2 * 19 inter-modulated signal fall on the system under evaluation mobile station receiver 1.1MHz reception carrier bandwidth; With 3 intermodulation products (895.6MHz, 895.8MHz, 896MHz) summation that fall on the receiver reception carrier bandwidth; Then the intermodulation product of transmitting terminal size is 43-IMD3+10 * 1g (3)=47.77-IMD3 (dBm), this intermodulation product size is deducted path loss L be the Intermodulation Interference that receiver receives.
S610 is said like step; Thermal noise in above-mentioned Intermodulation Interference signal and the system under evaluation receiver band is compared; Judge whether comparative result has surpassed 5.87dB (the system under evaluation receiver sensitivity worsens 1dB); If then think communication system to be assessed has been caused influence, otherwise think communication system to be assessed is not impacted.
Need to prove that above-mentioned instance 3 described system under evaluation can include but not limited to CDMA2000 system, TD-SCDMA system, LTE system, other communication system all should be included within protection scope of the present invention.
Adopt method of the present invention, can assess GU and mix of the influence of modular system base station side Intermodulation Interference, thereby take certain measure to evade, can guarantee safe operation system.
Need to prove; Can in computer system, carry out in the step shown in the flow chart of accompanying drawing such as a set of computer-executable instructions; And; Though logical order has been shown in flow chart, in some cases, can have carried out step shown or that describe with the order that is different from here.
Device embodiment
According to embodiments of the invention, a kind of apparatus for evaluating of Intermodulation Interference is provided.Fig. 7 is the structured flowchart according to the apparatus for evaluating of the Intermodulation Interference of the embodiment of the invention; As shown in Figure 7; This device comprises: divide module 71, first computing module 72, second computing module the 73, the 3rd and calculate module 74, judge module 75, the 4th computing module 76, determination module 77, describe in the face of said structure down.
Divide module 71, be used for the UMTS broadband width being divided into the identical UMTS narrow band bandwidth of a plurality of sizes according to the GSM bandwidth; First computing module 72 is connected to and divides module 71, is used to calculate the power on the UMTS narrow band bandwidth of dividing module 71 divisions; Second computing module 73 is connected to first computing module 72, the power calculation intermodulation distortion on the UMTS narrow band bandwidth that is used for calculating according to first computing module 72; The 3rd calculates module 74, is connected to first computing module 72 and second computing module 73, and intermodulation product is calculated in the intermodulation distortion that the power on the UMTS narrow band bandwidth that is used for calculating according to first computing module 72 and second computing module 73 calculate; Judge module 75 is connected to the 3rd and calculates module 74, judges whether the intermodulation product that the 3rd calculating module 74 calculates falls on the system under evaluation bandwidth; The 4th computing module 76 is connected to judge module 75, is used for after judge module 75 is judged, calculating Intermodulation Interference according to the intermodulation product that falls on the system under evaluation bandwidth; Determination module 77 is connected to the 4th computing module 76, is used for confirming the influence to system under evaluation according to the Intermodulation Interference that the 4th computing module 76 calculates.
Fig. 8 is the preferred structure block diagram according to the apparatus for evaluating of the Intermodulation Interference of the embodiment of the invention; As shown in Figure 8; Determination module 77 comprises: calculating sub module 84, comparison sub-module 85, first are confirmed submodule 86, second definite submodule 87, describe in the face of said structure down.
Calculating sub module 84 is connected to the 4th computing module 76, is used for after the 4th computing module 76 calculates Intermodulation Interference, calculating the difference of the thermal noise in Intermodulation Interference and the system under evaluation receiver band; Comparison sub-module 85 is connected to calculating sub module 84, is used for after calculating sub module 84 calculated difference, relatively difference and predetermined threshold; First confirms to be connected to comparison sub-module 85 by submodule 86, when being used for comparative result in comparison sub-module 85 and being difference and surpassing predetermined threshold, confirms system under evaluation has been caused influence; Second confirms to be connected to comparison sub-module 85 by submodule 87, when being used for comparative result in comparison sub-module 85 and being difference and surpassing predetermined threshold, confirms system under evaluation is not impacted.
In sum; Pass through the above embodiment of the present invention; Proposed a kind of evaluation scheme of Intermodulation Interference,, the UMTS broadband width has been divided into the UMTS narrow band bandwidth according to GSM and UMTS carrier wave characteristics; Produce intermodulation product with the GSM bandwidth respectively, assess GU and mix of the influence of modular system base station side Intermodulation Interference system under evaluation.Adopt scheme of the present invention, can assess GU and mix of the influence of modular system base station side Intermodulation Interference, thereby take certain measure to evade, can guarantee safe operation system.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize by calculation element.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the appraisal procedure of an Intermodulation Interference is characterized in that, comprising:
According to global mobile communication GSM bandwidth Universal Mobile Telecommunications System UMTS broadband width is divided into the identical UMTS narrow band bandwidth of a plurality of sizes, and calculates the power on the said UMTS narrow band bandwidth;
According to the power calculation intermodulation distortion on the said UMTS narrow band bandwidth, and according to power on the said UMTS narrow band bandwidth and said intermodulation distortion calculating intermodulation product;
Judge whether said intermodulation product falls on the system under evaluation bandwidth, and calculate Intermodulation Interference according to the intermodulation product that falls on the said system under evaluation bandwidth;
Confirm influence according to said Intermodulation Interference to said system under evaluation;
The said intermodulation distortion of power calculation according on the said UMTS narrow band bandwidth comprises:
IMD3＝P1+A-2×IIP3
Wherein, IMD3 is said intermodulation distortion, and P1 is a GSM carrier transmit power, and A is the power on the said UMTS narrow band bandwidth, and IIP3 is the equipment IIP 3;
Comprise according to power on the said UMTS narrow band bandwidth and said intermodulation distortion calculating intermodulation product:
If the third order intermodulation signal center frequency is 2f0-f
M, then the size of said intermodulation product is that GSM carrier transmit power deducts the difference that said intermodulation distortion obtains, wherein, M=1,2 ..., 19;
If the third order intermodulation signal center frequency is 2f
M-F0, then the size of said intermodulation product is that power on the said UMTS narrow band bandwidth deducts the difference that said intermodulation distortion obtains, wherein, and M=1,2 ..., 19.
2. method according to claim 1 is characterized in that, the size of said UMTS narrow band bandwidth is big or small identical with said GSM bandwidth.
3. method according to claim 2 is characterized in that, if the integral multiple that said UMTS broadband width is not said GSM bandwidth is then got the maximum integer of said GSM bandwidth and doubly divided from said UMTS broadband width.
4. method according to claim 1 is characterized in that, calculates said Intermodulation Interference according to said intermodulation product and comprises:
Said Intermodulation Interference is for suing for peace and deduct the value that path loss obtains again falling into said intermodulation product on the said system under evaluation bandwidth.
5. method according to claim 1 is characterized in that, confirms the influence of said system under evaluation is comprised according to said Intermodulation Interference:
Calculate the difference of the thermal noise in said Intermodulation Interference and the system under evaluation receiver band, and judge the influence of confirming said system under evaluation according to said difference.
6. method according to claim 5 is characterized in that, confirms the influence of said system under evaluation is comprised according to said Intermodulation Interference:
If said difference surpasses predetermined threshold, then confirm said system under evaluation has been caused influence, otherwise, confirm said system under evaluation is not impacted.
7. according to each described method in the claim 1 to 6, it is characterized in that said system under evaluation comprises:
Gsm system, UMTS system, CDMA2000 system, TD-SCDMA system, LTE system.
8. the apparatus for evaluating of an Intermodulation Interference is characterized in that, comprising:
Divide module, be used for the UMTS broadband width being divided into the identical UMTS narrow band bandwidth of a plurality of sizes according to the GSM bandwidth;
First computing module is used to calculate the power on the UMTS narrow band bandwidth of said division Module Division;
Second computing module is used for according to the power calculation intermodulation distortion on the said UMTS narrow band bandwidth; The said intermodulation distortion of power calculation according on the said UMTS narrow band bandwidth comprises: IMD3=P1+A-2 * IIP3, and wherein, IMD3 is said intermodulation distortion, and P1 is a GSM carrier transmit power, and A is said power, and IIP3 is the equipment IIP 3;
The 3rd calculates module, is used for calculating intermodulation product according to power on the said UMTS narrow band bandwidth and said intermodulation distortion; Comprise according to power on the said UMTS narrow band bandwidth and said intermodulation distortion calculating intermodulation product: if the third order intermodulation signal center frequency is 2f0-f
M, then the size of said intermodulation product is that GSM carrier transmit power deducts the difference that said intermodulation distortion obtains, wherein, M=1,2 ..., 19; If the third order intermodulation signal center frequency is 2f
M-f0, then the size of said intermodulation product is that power on the said UMTS narrow band bandwidth deducts the difference that said intermodulation distortion obtains, wherein, and M=1,2 ..., 19;
Judge module is used to judge whether said intermodulation product falls into the system under evaluation bandwidth;
The 4th computing module is used for calculating Intermodulation Interference according to the intermodulation product that falls on the said system under evaluation bandwidth;
Determination module is used for confirming the influence to said system under evaluation according to said Intermodulation Interference.
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| CN102547781B (en) * | 2010-12-14 | 2015-08-05 | 中国移动通信集团广东有限公司 | Intermodulation Interference cell determining method and device |
| CN103226168B (en) * | 2013-04-07 | 2015-05-20 | 南京纳特通信电子有限公司 | PIM+S parameter tester |
| CN104378782B (en) * | 2013-08-15 | 2018-05-22 | 中国移动通信集团江苏有限公司 | The recognition methods of interference signal and device in LTE system |
| CN106888063A (en) * | 2015-12-15 | 2017-06-23 | 中兴通讯股份有限公司 | The mutual interference detection method of common antenna feeder combiner, system and base station |
| CN111614371B (en) * | 2020-05-25 | 2021-07-06 | 中国电子科技集团公司第五十四研究所 | Interference suppression design method for passive intermodulation circuit |
| CN111988790B (en) * | 2020-08-28 | 2023-07-18 | 中国铁塔股份有限公司 | Intermodulation interference processing method and device, electronic equipment and readable storage medium |
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