CN106911400B - Intermodulation processing device and intermodulation processing method - Google Patents
Intermodulation processing device and intermodulation processing method Download PDFInfo
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- CN106911400B CN106911400B CN201710069683.XA CN201710069683A CN106911400B CN 106911400 B CN106911400 B CN 106911400B CN 201710069683 A CN201710069683 A CN 201710069683A CN 106911400 B CN106911400 B CN 106911400B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3913—Predictive models, e.g. based on neural network models
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Abstract
The invention provides an intermodulation processing device and an intermodulation processing method, wherein the device comprises a signal source, a first signal processing unit and a second signal processing unit, wherein the signal source is used for generating a first signal and a second signal of different frequency bands; a power amplifier; a combiner: the device is used for combining the first signal and the second signal which are amplified and input and then outputting a combined signal to the tested device; a splitter: for receiving intermodulation signals and separating odd-order and even-order intermodulation products from the intermodulation signals; the judging module is used for judging whether the intermodulation product can cause interference to normal equipment or not; a canceller for cancelling intermodulation products which cause interference to normal equipment. The invention simulates the co-construction shared multi-system multi-band wireless signal combining scene of the indoor distribution system through the power amplifier and the low intermodulation combiner, can detect odd-order and even-order products generated by multi-signal mixed intermodulation of different frequency bands, and reduces the harm of the intermodulation products by setting the judging mode of the intermodulation products and setting the reducer.
Description
Technical Field
The invention relates to the field of radio, in particular to an intermodulation processing device and an intermodulation processing method.
Background
In a communication system, when two or more signals enter a non-linear device of the equipment, the system may generate intermodulation products that, when dropped into the communication band of a nearby operating receiver, may create spurious interference.
Intermodulation interference causes harm to other systems and self systems, and the following conditions are approximately provided:
1. damage to itself
When the system is well debugged, the working frequency of the system is stable, but because the working of the amplifier and other nonlinear devices is disordered and the operating environment is not good, system disorder and equipment failure are frequent, and the available time of the equipment is reduced.
2. Reducing system coverage area
When the system works normally, the power of a system transmitter is determined and the system transmitter transmits in a specified bandwidth, but due to the existence of other intermodulation frequencies, the frequency signals can also be transmitted out through the transmitter equipment, the output of the frequencies not only causes harm to other services, but also occupies partial energy, and according to the law of conservation of energy, the effective power transmitted by the main frequency is reduced certainly, so that the coverage area of the system is reduced.
3. Dominant frequency spectral variation
After the intermodulation interference is transmitted, the intermodulation interference is superposed with a main frequency signal at the input end of a receiver, so that the frequency spectrum of the received signal is distorted, and the demodulated data has serious phase jitter, so that the receiver generates error codes, and the sensitivity of the system is reduced.
4. Interference wave order
The intermodulation products are sent out through an antenna feed system of a transmitter when the system works, radio background noise is raised by disordered and uneven radio frequency signals, the electromagnetic environment is deteriorated, the interference probability with signals of the established system is increased, and the disorder of the space radio wave order is caused.
The intermodulation interference is divided into transmitter intermodulation interference and receiver intermodulation interference according to different types of equipment generated by the interference. The transmitter intermodulation refers to interference caused by the fact that frequency combination generated by interaction of other signals coupled to the channel and a transmission signal of the channel at the transmission end is transmitted along with the transmission signal of the channel; the intermodulation of the receiver is that after two or more radio signals are received by the receiver, intermodulation products are generated due to the nonlinearity of a high-frequency amplifier, a mixer and the like in the receiver and fall into a receiving frequency band to form interference, and the power level of the intermodulation products is predicted by mainly establishing a prediction model by using a power series method, a Volterra series method and an IM Mircoscope method to predict the level of the intermodulation products. However, the methods have the advantages of wide application range, narrow application range and low operability.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides an intermodulation processing apparatus and an intermodulation processing method.
The invention is realized by the following technical scheme:
intermodulation processing apparatus, comprising:
the signal source is used for generating a first signal and a second signal of different frequency bands;
a power amplifier: the power amplifier is used for respectively carrying out power amplification on the first signal and the second signal;
a combiner: the power amplifier is used for amplifying the first signal and the second signal which are input by the power amplifier and outputting a combined signal to the tested equipment after combining;
a splitter: for receiving intermodulation signals and separating odd-order and even-order intermodulation products from the intermodulation signals; the intermodulation signal is generated by the tested equipment according to the combined signal input by the combiner;
the judging module is used for judging whether the intermodulation product can cause interference to normal equipment or not;
a canceller for cancelling intermodulation products which cause interference to normal equipment.
Furthermore, the signal sources of different frequency bands are also used for generating third signals of different frequency bands;
a power amplifier: the power amplifier is also used for amplifying the power of the third signal;
a combiner: the power amplifier is also used for outputting a combined signal to the tested equipment after the first signal, the second signal and the third signal which are amplified and input by the power amplifier are combined;
a splitter: and the second amplifier is also used for receiving the amplified and combined signals output by the first signal, the second signal and the third signal, and separating the intermodulation products of odd orders and even orders from the intermodulation signals.
Further, the determining module determines whether the intermodulation product will cause interference to the normal device by determining whether the ratio of the desired signal level to the interference signal level is within a predetermined range.
Further, still include:
and the transmitter intermodulation amplitude evaluation module is used for evaluating the intermodulation product amplitude at the input end of the receiver by utilizing a free space propagation model or an Ormuran-Hart propagation model.
Further, still include:
and the receiver intermodulation amplitude evaluation module is used for evaluating the interference generated by the external transmitter signal in the receiver by adopting an intercept point method.
An intermodulation processing method using the above intermodulation processing apparatus, the method comprising:
generating a first signal and a second signal of different frequency bands;
respectively carrying out power amplification on the first signal and the second signal;
combining the first signal and the second signal amplified and input by the power amplifier and outputting a combined signal to the tested equipment;
receiving intermodulation signals and separating intermodulation products of odd order and even order from the intermodulation signals; the intermodulation signal is generated by the tested equipment according to the combined signal input by the combiner;
judging whether the intermodulation product can cause interference to normal equipment or not;
intermodulation products that cause interference to normal devices are cancelled.
Further, still include:
generating a third signal of a different frequency band;
amplifying the power of the third signal;
combining the first signal, the second signal and the third signal which are amplified and input by the power amplifier, and then outputting a combined signal to the tested equipment;
and receiving a combined signal output by amplifying and combining the first signal, the second signal and the third signal, and separating the intermodulation products of odd orders and even orders from the intermodulation signals.
Further, still include:
determining whether the ratio of the desired signal level to the interference signal level is within a predetermined range;
if so, it is determined that the intermodulation product will cause interference to normal equipment.
Further, still include:
and evaluating the amplitude of the intermodulation product at the input end of the receiver by utilizing a free space propagation model or an Ormuran-Hart propagation model.
Further, still include:
and (4) evaluating intermodulation products by adopting an intercept point method.
The invention has the beneficial effects that:
the invention provides an intermodulation processing device and an intermodulation processing method, which can simulate an indoor distribution system co-construction shared multi-system multi-frequency-band wireless signal combining scene through a power amplifier and a low intermodulation combiner, can detect odd-order and even-order products generated by multi-signal mixed intermodulation of different frequency bands, and reduces the harm of intermodulation products by setting a judgment mode of intermodulation products and a reducer.
Drawings
Fig. 1 is a schematic diagram of an inventive intermodulation processing apparatus.
Fig. 2 is a flow chart of an intermodulation processing method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
An intermodulation processing apparatus, as shown in fig. 1, includes:
the signal source is used for generating a first signal and a second signal of different frequency bands;
a power amplifier: the power amplifier is used for respectively carrying out power amplification on the first signal and the second signal;
a combiner: the power amplifier is used for amplifying the first signal and the second signal which are input by the power amplifier and outputting a combined signal to the tested equipment after combining;
a splitter: for receiving intermodulation signals and separating odd-order and even-order intermodulation products from the intermodulation signals; the intermodulation signal is generated by the tested equipment according to the combined signal input by the combiner;
the judging module is used for judging whether the intermodulation product can cause interference to normal equipment or not;
a canceller for cancelling intermodulation products which cause interference to normal equipment.
Furthermore, the signal sources of different frequency bands are also used for generating third signals of different frequency bands;
a power amplifier: the power amplifier is also used for amplifying the power of the third signal;
a combiner: the power amplifier is also used for outputting a combined signal to the tested equipment after the first signal, the second signal and the third signal which are amplified and input by the power amplifier are combined;
a splitter: and the second amplifier is also used for receiving the amplified and combined signals output by the first signal, the second signal and the third signal, and separating the intermodulation products of odd orders and even orders from the intermodulation signals.
Specifically, the determining module determines whether the intermodulation product will cause interference to the normal device by determining whether a ratio of the desired signal level to the interference signal level is within a predetermined range.
Specifically, the method further comprises the following steps:
and the transmitter intermodulation amplitude evaluation module is used for evaluating the intermodulation product amplitude at the input end of the receiver by utilizing a free space propagation model or an Ormuran-Hart propagation model. The intermodulation product of the transmitter is transmitted out through an antenna feeder system of the system, finally reaches the input end of the receiver through wireless transmission, and the intermodulation product amplitude at the input end of the receiver is evaluated by utilizing a free space propagation model or an Ormura-Hart propagation model.
Specifically, the method further comprises the following steps:
and the receiver intermodulation amplitude evaluation module is used for evaluating the interference generated by the external transmitter signal in the receiver by adopting an intercept point method. The receiver intermodulation product is the interference generated by evaluating the external transmitter signal in the receiver, so the key point is how to evaluate the equivalent input level of the receiver and the amplitude level of the intermodulation product. The simplest method is to utilize the ip I and im I parameters provided in the receiver specification and to perform the intermodulation product evaluation according to the intercept point method provided in the spectrum monitoring manual.
An embodiment of the present invention further provides an intermodulation processing method, where the intermodulation processing method uses the above intermodulation processing apparatus, as shown in fig. 2, and the method includes:
s1, generating a first signal and a second signal of different frequency bands;
s2, respectively carrying out power amplification on the first signal and the second signal;
s3, combining the first signal and the second signal amplified and input by the power amplifier, and outputting a combined signal to the tested equipment;
s4, receiving intermodulation signals, and separating intermodulation products of odd orders and even orders from the intermodulation signals; the intermodulation signal is generated by the tested equipment according to the combined signal input by the combiner;
s5, judging whether the intermodulation product can cause interference on normal equipment or not;
and S6, eliminating intermodulation products which can cause interference to normal equipment.
Further, still include:
generating a third signal of a different frequency band;
amplifying the power of the third signal;
combining the first signal, the second signal and the third signal which are amplified and input by the power amplifier, and then outputting a combined signal to the tested equipment;
and receiving a combined signal output by amplifying and combining the first signal, the second signal and the third signal, and separating the intermodulation products of odd orders and even orders from the intermodulation signals.
Further, still include:
determining whether the ratio of the desired signal level to the interference signal level is within a predetermined range;
if so, it is determined that the intermodulation product will cause interference to normal equipment.
Specifically, whether the equipment which normally works is interfered is further judged according to the fact that the radio frequency channel protection ratio (the ratio of the required signal level to the interference signal level) of the intermodulation product amplitude and the desired signal is within 8 +/-3 dB.
Further, still include:
and evaluating the amplitude of the intermodulation product at the input end of the receiver by utilizing a free space propagation model or an Ormuran-Hart propagation model.
Further, still include:
the method for estimating the interference generated by the external transmitter signal in the receiver by adopting an intercept point method is provided according to a spectrum monitoring manual.
The method comprises the following specific steps:
the evaluation steps are as follows: firstly, calculating the input level of each input frequency of a receiver by utilizing a free space propagation model; secondly, evaluating the equivalent input level of the receiver; and finally, estimating the amplitude of the intermodulation product by combining the IPi and the IMi of the receiver equipment.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (4)
1. An intermodulation processing apparatus, comprising: the signal source is used for generating a first signal and a second signal of different frequency bands;
a power amplifier: the power amplifier is used for respectively carrying out power amplification on the first signal and the second signal;
a combiner: the power amplifier is used for amplifying the first signal and the second signal which are input by the power amplifier and outputting a combined signal to the tested equipment after combining;
a splitter: for receiving intermodulation signals and separating odd-order and even-order intermodulation products from the intermodulation signals; the intermodulation signal is generated by the tested equipment according to the combined signal input by the combiner; the intermodulation products comprise transmitter intermodulation products and receiver intermodulation products of the device under test;
the transmitter intermodulation amplitude evaluation module is used for evaluating the intermodulation product amplitude at the input end of the receiver by utilizing a free space propagation model or an Ormuran-Hart propagation model if the intermodulation product of the transmitter is transmitted out through an antenna feeder system of the system and finally reaches the input end of the receiver through wireless transmission;
the receiver intermodulation amplitude evaluation module is used for evaluating interference generated by an external transmitter signal in the receiver by adopting an intercept point method;
the judging module is used for judging whether the ratio of the required signal level to the interference signal level is in a preset range or not so as to judge whether the intermodulation product can cause interference to normal equipment or not; the normal equipment comprises any equipment in an indoor distribution system co-constructed shared multi-system multi-band wireless signal combiner scene where the tested equipment is currently located; the jamming signal level comprises the transmitter intermodulation amplitude and the receiver intermodulation amplitude;
a canceller for cancelling intermodulation products which cause interference to normal equipment.
2. The apparatus of claim 1, wherein: the signal source is also used for generating a third signal with different frequency bands;
a power amplifier: the power amplifier is also used for amplifying the power of the third signal;
a combiner: the power amplifier is also used for outputting a combined signal to the tested equipment after the first signal, the second signal and the third signal which are amplified and input by the power amplifier are combined;
a splitter: and the second amplifier is also used for receiving the amplified and combined signals output by the first signal, the second signal and the third signal, and separating the intermodulation products of odd orders and even orders from the intermodulation signals.
3. An intermodulation processing method using the intermodulation processing apparatus of claim 1, the method comprising: generating a first signal and a second signal of different frequency bands;
respectively carrying out power amplification on the first signal and the second signal;
combining the first signal and the second signal amplified and input by the power amplifier and outputting a combined signal to the tested equipment;
receiving intermodulation signals and separating intermodulation products of odd order and even order from the intermodulation signals; the intermodulation signal is generated by the tested equipment according to the combined signal input by the combiner; the intermodulation products comprise transmitter intermodulation products and receiver intermodulation products of the device under test;
if the intermodulation product of the transmitter is transmitted out through an antenna feeder system of the system and finally reaches the input end of the receiver through wireless transmission, evaluating the amplitude of the intermodulation product at the input end of the receiver by utilizing a free space propagation model or an Ormura-Hart propagation model;
estimating interference generated by an external transmitter signal in a receiver by adopting an intercept point method;
determining whether the ratio of the desired signal level to the interference signal level is within a predetermined range; if so, judging that the intermodulation product can cause interference on normal equipment; the normal equipment comprises any equipment in an indoor distribution system co-constructed shared multi-system multi-band wireless signal combiner scene where the tested equipment is currently located; the jamming signal level comprises the transmitter intermodulation amplitude and the receiver intermodulation amplitude;
intermodulation products that cause interference to normal devices are cancelled.
4. The method of claim 3, further comprising: generating a third signal of a different frequency band;
amplifying the power of the third signal;
combining the first signal, the second signal and the third signal which are amplified and input by the power amplifier, and then outputting a combined signal to the tested equipment;
and receiving a combined signal output by amplifying and combining the first signal, the second signal and the third signal, and separating the intermodulation products of odd orders and even orders from the intermodulation signals.
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| CN104967494A (en) * | 2015-04-30 | 2015-10-07 | 华为技术有限公司 | Test method, test device and test system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2012107600A1 (en) * | 2011-02-09 | 2012-08-16 | At4 Wireless, S.A. | Method for generating interference signals and device for carrying out said method |
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| CN102752241A (en) * | 2011-04-22 | 2012-10-24 | 华为技术有限公司 | Method, device and system for detecting quality of channel |
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| CN103368665A (en) * | 2012-03-30 | 2013-10-23 | 中国联合网络通信有限公司广东省分公司 | Multi-signal passive intermodulation test method, equipment and system |
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