CN111757331A - Network coverage optimization equipment and passive intermodulation interference detection method thereof - Google Patents
Network coverage optimization equipment and passive intermodulation interference detection method thereof Download PDFInfo
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- CN111757331A CN111757331A CN201910250136.0A CN201910250136A CN111757331A CN 111757331 A CN111757331 A CN 111757331A CN 201910250136 A CN201910250136 A CN 201910250136A CN 111757331 A CN111757331 A CN 111757331A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention provides a network coverage optimization device and a passive intermodulation interference detection method thereof. The passive intermodulation detection and control function is added in the network coverage optimization equipment, so that the passive intermodulation performance of an antenna feed system externally connected with the equipment can be automatically detected. In addition, the embodiment of the invention can alarm and report in time when the passive intermodulation index is unqualified, automatically control the downlink output power of the equipment, ensure the normal uplink background noise and avoid the interference to the information source base station. In addition, the embodiment of the invention can also independently carry out passive intermodulation detection and control of the external antenna feeder aiming at each downlink radio frequency output port, can remotely/locally trigger the passive intermodulation detection function and is convenient for troubleshooting problems. The method provided by the embodiment of the invention can be suitable for various network coverage optimization devices, overcomes the defects that the prior art is difficult to construct and cannot solve the intermodulation interference, has the characteristics of low cost, high platformization, strong stability and the like, and has a very good market popularization prospect.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to network coverage optimization equipment and a passive intermodulation interference detection method thereof.
Background
In the wireless coverage scheme in the prior art, the applications of an active distributed network coverage optimization device and a passive antenna feeder system are increasing. The traditional antenna feeder system is a mainstream scheme for indoor coverage because of no need of power supply, low manufacturing cost, high reliability and easy expansion. Then, since the Passive devices and the antenna nodes are numerous, the distribution network is complex, and the Passive devices and the antenna nodes cannot be monitored, the Passive devices and the antenna nodes deteriorate in a long-term use process, and Passive Inter-Modulation (PIM) is generated, so that the background noise of an active room subsystem and a base station is influenced.
In the prior art, a portable intermodulation detector is generally adopted for PIM detection, and the PIM detection is mainly carried out at the initial installation stage. At the time of detection, the passive antenna feed system needs to be disconnected from the active network coverage optimization equipment and connected to a passive intermodulation test instrument. The detection scheme can bring about two influences, namely, after the connection is disconnected, no signal coverage exists in the whole chip area, and the signal quality of a coverage area is influenced; secondly, a portable intermodulation tester is adopted, a narrow-band CW signal can be sent, and the signal coverage cell is interfered by sweeping a working frequency band area through a strong narrow-band Continuous Wave (CW) signal.
In order to increase the convenience of construction, another technical solution in the industry is to embed a passive intermodulation detector in a base station, so that the passive intermodulation in the base station equipment can be tested in an engineering field.
The scheme of testing passive intermodulation by adopting the built-in or external passive intermodulation detector in the prior art increases the cost on one hand, is inconvenient to construct on the other hand, is difficult to solve the interference caused by the passive intermodulation, and has high cost if being used in a large amount in an indoor distribution system.
Disclosure of Invention
An object of the embodiments of the present invention is to provide a network coverage optimization device and a method for detecting passive intermodulation interference thereof, which overcome the problems of difficulty in construction and difficulty in solving intermodulation interference in the existing detection method, and have the advantages of low implementation cost and strong stability.
The embodiment of the invention provides a method for detecting passive intermodulation interference of network coverage optimization equipment,
generating a test signal by using a digital signal processing module in a downlink of the network coverage optimization equipment, filtering the test signal by using a first passive intermodulation filter, shifting a frequency spectrum, converting the frequency spectrum into a downlink radio frequency signal, and sending the downlink radio frequency signal to an antenna feeder system connected with the network coverage optimization equipment; receiving an uplink radio frequency signal fed back to an uplink of the network coverage optimization equipment by the antenna feed system, carrying out spectrum shifting and analog-to-digital conversion processing on the uplink radio frequency signal, and obtaining an intermodulation interference signal corresponding to the test signal after filtering processing by a second passive intermodulation filter;
and detecting the power of the intermodulation interference signal to generate an evaluation index of the passive intermodulation interference.
Preferably, the step of generating a test signal by using a digital signal processing module in a downlink of the network coverage optimization device includes:
and generating at least two test signals by using a digital signal processing module in the downlink of the network coverage optimization equipment, wherein the bandwidth interval between the test signals is larger than the bandwidth of the working frequency band of the network coverage optimization equipment.
Preferably, the step of detecting the power of the intermodulation interference signal and generating an evaluation index of passive intermodulation interference includes:
calculating a bandwidth interval to be tested, in which passive intermodulation interference possibly exists, according to the respective frequency range of the at least two test signals;
traversing each bandwidth interval to be tested, adjusting the band-pass intervals of the first passive intermodulation filter and the second passive intermodulation filter according to the currently traversed bandwidth interval to be tested, and detecting to obtain the power of the intermodulation interference signal in the currently traversed bandwidth interval to be tested;
and selecting the maximum power of the intermodulation interference signals according to the detected power of the intermodulation interference signals in each bandwidth interval to be detected, and generating an evaluation index of the passive intermodulation interference.
Preferably, after generating the evaluation index of the passive intermodulation interference, the method includes:
and when the evaluation index of the passive intermodulation interference indicates that the passive intermodulation interference exceeds a preset threshold, carrying out regulation and control treatment on the passive intermodulation interference.
Preferably, the regulation and control processing of the passive intermodulation interference includes at least one of the following processing:
reducing the output power of the downlink radio frequency signal of the downlink;
reducing an uplink gain of the uplink; and the number of the first and second groups,
turning off the downlink and the downlink.
The embodiment of the invention also provides network coverage optimization equipment, which comprises a duplexer, and a downlink and an uplink which are respectively connected with the duplexer;
wherein the downlink comprises:
the digital signal processing module is used for generating a test signal;
the first passive intermodulation filter is used for filtering the test signal to obtain a first intermediate signal;
the digital-to-analog conversion and frequency spectrum shifting module is used for performing digital-to-analog conversion on the first intermediate signal, performing frequency spectrum shifting conversion on the first intermediate signal to convert a downlink radio frequency signal, transmitting the downlink radio frequency signal to the duplexer, and transmitting the downlink radio frequency signal to an antenna feeder system connected with the network coverage optimization equipment through the duplexer;
the uplink includes:
the frequency spectrum shifting and analog-to-digital conversion module is used for receiving an uplink radio frequency signal fed back by the antenna feed system through the duplexer and carrying out frequency spectrum shifting and analog-to-digital conversion processing on the uplink radio frequency signal to obtain a second intermediate signal;
the second passive intermodulation filter is used for filtering the second intermediate signal to obtain an intermodulation interference signal corresponding to the test signal;
and the detection processing module is used for detecting the power of the intermodulation interference signal and generating an evaluation index of the passive intermodulation interference.
Preferably, the digital signal processing module is further configured to generate at least two test signals, and a bandwidth interval between the test signals is greater than a bandwidth of an operating frequency band of the network coverage optimization device.
Preferably, the detection processing module includes:
the power statistics module is used for calculating a bandwidth interval to be tested, in which the passive intermodulation interference possibly exists, according to the respective frequency range of the at least two test signals; traversing each bandwidth interval to be tested, adjusting the band-pass intervals of the first passive intermodulation filter and the second passive intermodulation filter according to the currently traversed bandwidth interval to be tested, and detecting to obtain the power of the intermodulation interference signal in the currently traversed bandwidth interval to be tested; and selecting the maximum power of the intermodulation interference signals according to the detected power of the intermodulation interference signals in each bandwidth interval to be detected, and generating an evaluation index of the passive intermodulation interference.
Preferably, the network coverage optimizing device further includes:
and the regulation and control module is used for carrying out regulation and control processing on the passive intermodulation interference when the evaluation index of the passive intermodulation interference indicates that the passive intermodulation interference exceeds a preset threshold.
Preferably, the regulation and control processing of the passive intermodulation interference includes at least one of the following processing:
reducing the output power of the downlink radio frequency signal of the downlink;
reducing an uplink gain of the uplink; and the number of the first and second groups,
turning off the downlink and the downlink.
An embodiment of the present invention further provides a network coverage optimization device, including: a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method as described above.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method are implemented as described above.
According to the network coverage optimization equipment and the passive intermodulation interference detection method thereof provided by the embodiment of the invention, the passive intermodulation performance of the antenna feed system externally connected with the equipment can be automatically detected by adding the passive intermodulation detection and control function in the network coverage optimization equipment. In addition, the embodiment of the invention can alarm and report in time when the passive intermodulation index is unqualified, automatically control the downlink output power of the equipment, ensure the normal uplink background noise and avoid the interference to the information source base station. In addition, the embodiment of the invention can also independently carry out passive intermodulation detection and control of the external antenna feeder aiming at each downlink radio frequency output port, can remotely/locally trigger the passive intermodulation detection function and is convenient for troubleshooting problems. The method provided by the embodiment of the invention can be suitable for various network coverage optimization devices, overcomes the defects that the prior art is difficult to construct and cannot solve the intermodulation interference, has the characteristics of low cost, high platformization, strong stability and the like, and has a very good market popularization prospect.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic view of an application scenario of a gain control method of a network coverage optimization device according to an embodiment of the present invention;
fig. 2 is another schematic diagram of an application scenario of the gain control method of the network coverage optimization device according to the embodiment of the present invention;
fig. 3 is a schematic flowchart of a method for detecting passive intermodulation interference of a network coverage optimization device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a network coverage optimizing device according to an embodiment of the present invention;
fig. 5 is an exemplary diagram of a DDS generating module employed in an embodiment of the invention;
FIG. 6 is an exemplary diagram of a phase accumulator in the DDS generation module of an embodiment of the present invention;
FIG. 7 is an exemplary diagram of a power statistics module according to an embodiment of the present invention;
fig. 8 is another schematic structural diagram of a network coverage optimizing device according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. In the description and in the claims "and/or" means at least one of the connected objects.
The following description provides examples and does not limit the scope, applicability, or configuration set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the spirit and scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the described methods may be performed in an order different than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
The embodiment of the invention provides network coverage optimization equipment and a gain control method thereof, which can automatically control the gain on the network coverage optimization equipment side according to an information source, avoid the network problem that parameters are easily set manually and caused by parameter mismatching, reduce the maintenance cost of the equipment and improve the coverage effect of a network optimization system.
The network coverage optimization device of the embodiment of the invention comprises but is not limited to devices such as a digital repeater, an optical fiber distribution system, a micro repeater, a trunk amplifier and the like. These devices receive signals from a source (e.g., a base station) and transmit them to the coverage enhancement unit, and receive signals from the coverage enhancement unit and transmit them back to the source, either wirelessly or by wire. The coverage enhancement unit comprises a passive antenna feed system, a remote unit, a coverage antenna and other equipment.
For example, taking a digital repeater as an example, an existing digital repeater mainly includes an optical fiber repeater and a wireless repeater, fig. 1 and fig. 2 show two application scenarios of the method for detecting passive intermodulation interference of network coverage optimization equipment according to an embodiment of the present invention, where fig. 1 is a distributed optical fiber repeater, and fig. 2 is a single-machine wireless repeater. The digital repeater is taken as an example for illustration, and it should be noted that the present invention is not limited to the application scenario of the digital repeater, and can also be applied to other network coverage optimization devices except the digital repeater.
As shown in fig. 1, the optical fiber repeater includes a Radio Access Unit (RAU) and a High power Remote Unit (HRU). In a forward link (a downlink from a signal source to a digital repeater), a radio frequency access unit enters downlink radio frequency signals of the signal sources such as GSM, NB-IoT, FDD-LTE and the like into an optical fiber repeater in a wired coupling mode, converts the downlink radio frequency signals into digital signals, photoelectrically converts the digital signals into optical signals and transmits the optical signals to a remote unit; the high-power remote unit converts the digital signals issued by the radio frequency access unit into radio frequency signals, and wireless coverage of signals such as GSM, NB-IoT, FDD-LTE and the like is realized. In a reverse link (from a digital repeater to a signal source), the high-power remote unit converts an uplink radio frequency signal received wirelessly into a digital signal and transmits the digital signal to the radio frequency access unit; the radio frequency access unit converts the digital signals uploaded by the remote unit into uplink radio frequency signals and transmits the uplink radio frequency signals back to the information source in a wired mode. The radio frequency access unit supports the function of remote monitoring management on the remote unit.
As shown in fig. 2, the digital wireless repeater station wirelessly couples downlink radio frequency signals of signal sources such as GSM, NB-IoT, FDD-LTE, etc. into the digital wireless repeater station, amplifies the downlink radio frequency signals with low noise, converts the downlink radio frequency signals into digital signals, digitizes the digital signals, converts the digital signals into radio frequency signals, amplifies the radio frequency signals, and then achieves wireless coverage of the signals such as GSM, NB-IoT, FDD-LTE, etc.; meanwhile, a user signal enters the digital wireless repeater system in a wireless receiving mode, and is transmitted back to the information source in a wireless mode after digital-to-analog conversion, digital processing and power amplification.
Fiber optic distribution systems typically include: the system comprises a radio frequency access unit connected with a signal source, an expansion unit connected with the access unit, and a plurality of remote units connected with the expansion unit. The structure of the optical fiber distributed system is similar to the digital repeater shown in fig. 1, except that an extension unit is added to the radio frequency access unit and the remote unit, thereby extending the access capability and the coverage area of the system. Specifically, the extension unit may be connected to the radio frequency access unit and the remote unit through optical fibers.
For the specific structure of the micro-repeater and the trunk amplifier, reference may be made to the related description of the prior art, and for brevity, no further description is provided herein.
Referring to fig. 3, an embodiment of the present invention provides a method for detecting passive intermodulation interference of a network coverage optimization device, which overcomes the problems of difficulty in construction and intermodulation interference solution in the conventional detection method, and has the advantages of low implementation cost and high stability. Referring to fig. 3, the method includes:
And 32, detecting the power of the intermodulation interference signal, and generating an evaluation index of the passive intermodulation interference.
Here, when the evaluation index of the passive intermodulation interference indicates that the passive intermodulation interference exceeds a predetermined threshold, the regulation and control processing of the passive intermodulation interference is performed. Specifically, the regulation and control processing of the passive intermodulation interference includes at least one of the following processing:
reducing the output power of the downlink radio frequency signal of the downlink;
reducing an uplink gain of the uplink; and the number of the first and second groups,
turning off the downlink and the downlink.
In addition, when the embodiment of the invention performs the regulation and control processing, an alarm signal can be generated and reported to the network manager so as to remind the network manager of processing in time.
In this way, in each active network coverage optimization device, the embodiment of the present invention adds a function including detecting passive intermodulation and processing passive intermodulation interference to software, and connects the software with a conventional passive device through an existing hardware platform. When the equipment is started or restarted for the first time, the passive intermodulation detection function is automatically started, the generated intermodulation is processed, and the bottom noise interference to the base station is reduced.
Through the steps, the passive intermodulation detection and control functions are added in the network coverage optimization equipment, and the passive intermodulation performance of an antenna feed system externally connected with the equipment can be automatically detected. In addition, the embodiment of the invention can alarm and report in time when the passive intermodulation index is unqualified, automatically control the downlink output power of the equipment, ensure the normal uplink background noise and avoid the interference to the information source base station. In addition, the embodiment of the invention can also independently carry out passive intermodulation detection and control of the external antenna feeder aiming at each downlink radio frequency output port, can remotely/locally trigger the passive intermodulation detection function and is convenient for troubleshooting problems. The method provided by the embodiment of the invention can be suitable for various network coverage optimization devices, overcomes the defects that the prior art is difficult to construct and cannot solve the intermodulation interference, has the characteristics of low cost, high platformization, strong stability and the like, and has a very good market popularization prospect.
Preferably, in step 31, the embodiment of the present invention may generate the test signal in the following manner: and generating at least two test signals by using a digital signal processing module in the downlink of the network coverage optimization equipment, wherein the bandwidth interval between the test signals is larger than the bandwidth of the working frequency band of the network coverage optimization equipment.
In step 32, in the embodiment of the present invention, a bandwidth interval to be tested, where passive intermodulation interference may exist, may be calculated according to respective frequency range of the at least two test signals; then, traversing each bandwidth interval to be tested, adjusting the band-pass intervals of the first passive intermodulation filter and the second passive intermodulation filter according to the currently traversed bandwidth interval to be tested, and detecting to obtain the power of the intermodulation interference signal in the currently traversed bandwidth interval to be tested; and selecting the maximum power of the intermodulation interference signals according to the detected power of the intermodulation interference signals in each bandwidth interval to be detected, and generating an evaluation index of the passive intermodulation interference.
For example, assuming that two test signals are generated, the frequency bands of which are F1 and F2, respectively, then the passive intermodulation interference may include 3-order intermodulation interference (the frequency bands are 2F1-F2 and 2F2-F1), five-order intermodulation interference (the frequency bands are 3F1-2F2 and 3F2-2F1), or other high-order intermodulation interference, and the bandwidth interval to be tested is the frequency band in which the above-mentioned high-order intermodulation interference is located. Since there may be a plurality of high-order intermodulation interferences, the embodiment of the present invention may traverse the plurality of high-order intermodulation interferences, and adjust the band-pass sections of the first passive intermodulation filter and the second passive intermodulation filter on the frequency band where the currently traversed high-order intermodulation interference is located, so that the corresponding product of the high-order intermodulation interference may pass through the above-mentioned filters to perform power detection. In addition, since the powers of a plurality of intermodulation products may be detected, an evaluation index of intermodulation interference may be generated based on the maximum power therein. For example, when the maximum power exceeds a certain preset threshold, it is prompted that the regulation and control processing of the passive intermodulation interference needs to be performed.
Having described the method for detecting passive intermodulation interference of network coverage optimization equipment according to an embodiment of the present invention, the network coverage optimization equipment implementing the method will be further provided below.
Referring to fig. 4, in the network coverage optimizing device 40 provided in the embodiment of the present invention, the network coverage optimizing device 40 may specifically be the optical repeater shown in fig. 1, may also be the wireless repeater shown in fig. 2, and may also be a device such as an optical fiber distribution system, a micro repeater, or a trunk amplifier. As shown in fig. 4, the network coverage optimizing device 40 includes: a duplexer 41, and a downlink and an uplink respectively connected to the duplexer 41;
wherein the downlink comprises:
and a digital signal processing module 42 for generating a test signal.
A first passive intermodulation filter 43, configured to perform filtering processing on the test signal to obtain a first intermediate signal;
a digital-to-analog conversion and spectrum shifting module 44, configured to perform digital-to-analog conversion on the first intermediate signal, perform spectrum shifting and convert the first intermediate signal into a downlink radio frequency signal, send the downlink radio frequency signal to the duplexer, and send the downlink radio frequency signal to an antenna feeder system connected to the network coverage optimization device through the duplexer 41;
the uplink includes:
the frequency spectrum shifting and analog-to-digital conversion module 45 is configured to receive an uplink radio frequency signal fed back by the antenna feed system through the duplexer 41, and perform frequency spectrum shifting and analog-to-digital conversion processing on the uplink radio frequency signal to obtain a second intermediate signal;
a second passive intermodulation filter 46, configured to perform filtering processing on the second intermediate signal to obtain an intermodulation interference signal corresponding to the test signal;
and the detection processing module 47 is configured to detect the power of the intermodulation interference signal, and generate an evaluation index of the passive intermodulation interference.
Preferably, the digital signal processing module is further configured to generate at least two test signals, and a bandwidth interval between the test signals is greater than a bandwidth of an operating frequency band of the network coverage optimization device.
Preferably, a plurality of modules in the network coverage optimization device may be implemented in a remote unit of a fiber optic repeater or implemented inside a wireless repeater. Specifically, the method is implemented by using each existing module in the existing network coverage optimization equipment. Fig. 4 shows a specific implementation of the modules, where a triangle represents a power amplifier, a circle with an x inside represents a mixer, an ADC represents an analog-to-Digital converter, a DAC represents a Digital-to-analog converter, an "orthogonalization" represents a module for orthogonalizing a signal, a "4-fold decimation" represents a decimation processing module, a "4-fold interpolation" represents an interpolation processing module, and a "DDS generation module" represents a Direct Digital Synthesizer (Direct Digital Synthesizer) for generating a Digital signal.
It can be seen that the digital signal processing module 42 may adopt a DDS generation module in the network coverage optimization device, and the digital-to-analog conversion and spectrum shifting module 44 may include an interpolation processing module, a DAC, a mixer, and a power amplifier in the downlink of the network coverage optimization device. The spectrum shifting and analog-to-digital conversion module 45 may include a power amplifier, a mixer, and an ADC in the uplink of the network coverage optimization device. The detection processing module 47 may include an orthogonalization processing module, a decimation processing module and a power statistics module in the uplink of the network coverage optimization device.
In fig. 4, the uplink and downlink respectively include a bypass switch. When the detection in fig. 3 needs to be performed, the two bypass switches may be turned off, so that the first passive intermodulation filter and the second passive intermodulation filter are connected to the corresponding uplink and downlink; after the detection is completed, the two bypass switches may be turned off, so that the first passive intermodulation filter and the second passive intermodulation filter are subjected to bypass processing, and at this time, the first passive intermodulation filter and the second passive intermodulation filter are no longer located in the corresponding uplink and downlink.
In fig. 4, the downlink digital signal processing module 42, the first passive intermodulation filter 43 and the digital-to-analog conversion and spectrum shifting module 44 together implement the generation and transmission of the test signal. Preferably, 2 broadband signals (digital signals) with frequency intervals larger than the bandwidth of the working frequency band of the network coverage optimization device can be generated by the digital signal processing module 42, and then the digital signals are processed by a module such as a DAC and the like, converted into intermediate frequency signals, converted into radio frequency signals by a mixer, and amplified by using a radio frequency power amplification link of FDD.
For example, the digital signal processing module 42 may use a DDS generation module to transmit CW continuous waveforms or DC waveforms at different frequency (100KHz-60MHz) intervals and at different power levels (0 dBfs maximum). In order to prevent the signal from interfering with the working frequency band of the base station, the frequency band of the signal generated by the module is located outside the working frequency band of the network coverage optimization equipment, and the power level of the signal is lower than that of the working signal of the network coverage optimization equipment. In addition, the signal generation can be time-division, and the synchronous transmission and reception are ensured. The transmitted signal may be transmitted intermittently.
Fig. 5 shows a schematic structural diagram of the DDS generating module. Fig. 6 shows a schematic structural diagram of a phase accumulator in the DDS generation module, where the phase accumulator is formed by cascading an N-bit accumulator and an N-bit register. As an example, in an embodiment of the present invention, the DDS production principle, its functional requirements generate a 2-channel Numerically Controlled Oscillator (NCO) signal, and there is no indication of spurious dynamic range, i.e., SFDR >96dBc, and frequency resolution 0.1 MHz. Specifically, under the driving of a reference clock, a phase accumulator performs linear accumulation on a frequency control word, and an obtained phase code addresses a waveform memory to output a corresponding amplitude code, namely, a signal is mixed.
As a preferred mode, the digital-to-analog conversion and spectrum shifting module 44 in fig. 4 transmits the test signal of intermodulation detection together with the signal required by the network coverage optimization device operating frequency band. The amplitude of the transmitted signal generally needs to be smaller than the operating signal, taking into account the effect of the out-of-band signal on the in-band signal. In addition, considering that the out-of-band signal is influenced by the analog filter, the embodiment of the invention can widen the working bandwidth of the filter, the duplexer or the multiplexer, so that the test signal of the intermodulation detection and the working signal of the active network coverage optimization equipment are sent out together.
In fig. 4, the uplink includes a spectrum shifting and analog-to-digital conversion module 45, a second passive intermodulation filter 46 and a detection processing module 47, the intermodulation products can be amplified by using the FDD radio frequency receiving link, then converted into intermediate frequency signals through frequency mixing, sampled by the ADC processor and converted into digital signals, and the intermodulation products are filtered and analyzed by the second passive intermodulation filter 46 and the detection processing module 47.
Specifically, the rf processing module (including power amplifier and mixer) of the spectrum shifting and analog-to-digital conversion module 45 is used to receive the intermodulation product reflected back and amplify it by the rf uplink to make it sufficiently recognized by the ADC.
And sampling the intermodulation product through the ADC and carrying the intermodulation product to a baseband signal, filtering the intermodulation product through a second passive intermodulation filter to remove incoherent signals, and entering a power statistics module for analysis. The power statistics module is mainly used for performing statistics on the input power of the AD front end, so as to adjust the system state according to the requirement of the active indoor subsystem on the intermodulation product, and a functional block diagram for implementing the power statistics function is shown in fig. 7.
Specifically, the power statistics module is configured to calculate a bandwidth interval to be tested, where passive intermodulation interference may exist, according to respective frequency range of the at least two test signals; traversing each bandwidth interval to be tested, adjusting the band-pass intervals of the first passive intermodulation filter and the second passive intermodulation filter according to the currently traversed bandwidth interval to be tested, and detecting to obtain the power of the intermodulation interference signal in the currently traversed bandwidth interval to be tested; and selecting the maximum power of the intermodulation interference signals according to the detected power of the intermodulation interference signals in each bandwidth interval to be detected, and generating an evaluation index of the passive intermodulation interference.
For the uplink intermodulation product, after the DDS is controlled to send the test signal each time, the power value (such as the minimum value, the maximum value, the average value, and the like) counted inside the power counting module (which can be realized by the FPGA) is read and recorded in the designated file. The collected intermodulation product data is used for subsequent processing, analysis and control of the active distributed system.
Preferably, the network coverage optimizing device 40 further includes:
and a regulating and controlling module 48, configured to perform, when the evaluation index of the passive intermodulation interference indicates that the passive intermodulation interference exceeds a predetermined threshold, a regulating and controlling process on the passive intermodulation interference. Preferably, the regulation and control processing of the passive intermodulation interference includes at least one of the following processing: reducing the output power of the downlink radio frequency signal of the downlink; reducing an uplink gain of the uplink; and, turning off the downlink and the downlink.
Specifically, the regulation and control module may include an intermodulation product analysis module and an anti-interference module, and is configured to analyze and determine the size of an intermodulation product signal, equivalently convert the intermodulation product signal into a power class that affects a standard signal, determine that a signal exceeding a predetermined requirement is interference, and start the anti-interference module.
The intermodulation product analysis module is internally provided with a digital filter and a frequency spectrum shifting function, a frequency band possibly existing in an intermodulation product is obtained by adopting a corresponding algorithm according to different signals, the frequency band possibly existing in the intermodulation product is traversed by the digital filter, and an uplink passive intermodulation interference value is obtained through comprehensive calculation.
The anti-interference module mainly realizes two functions, namely automatically adjusting uplink gain and downlink output power according to the size of the identified intermodulation product, and reducing the influence of passive intermodulation on base station noise; and secondly, the network manager or the alarm platform is actively reported when intermodulation is abnormal, and the digital signal can be closed to wait for processing.
Referring to fig. 8, another schematic structural diagram of a network coverage optimizing device 800 according to an embodiment of the present invention includes: a processor 801, a transceiver 802, a memory 803, and a bus interface, wherein:
the processor 801 is configured to read a program in the memory, and execute the following processes: generating a test signal by using a digital signal processing module in a downlink of the network coverage optimization equipment, filtering the test signal by using a first passive intermodulation filter, and carrying out spectrum shifting to convert the test signal into a downlink radio frequency signal; performing spectrum shifting and analog-to-digital conversion processing on the uplink radio frequency signal received by the transceiver 802, and filtering the uplink radio frequency signal by using a second passive intermodulation filter to obtain an intermodulation interference signal corresponding to the test signal; and detecting the power of the intermodulation interference signal to generate an evaluation index of the passive intermodulation interference.
The transceiver 802 is configured to send the downlink radio frequency signal to an antenna feeder system connected to the network coverage optimization device, and receive an uplink radio frequency signal fed back to an uplink of the network coverage optimization device by the antenna feeder system.
In FIG. 8, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by the processor 801, and various circuits, represented by the memory 803, linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 802 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.
The processor 801 is responsible for managing the bus architecture and general processing, and the memory 803 may store data used by the processor 801 in performing operations.
Preferably, the processor 801 is further configured to read a program in the memory, and execute the following processes:
and when the evaluation index of the passive intermodulation interference indicates that the passive intermodulation interference exceeds a preset threshold, carrying out regulation and control treatment on the passive intermodulation interference.
Preferably, the regulation and control processing of the passive intermodulation interference includes at least one of the following processing:
reducing the output power of the downlink radio frequency signal of the downlink;
reducing an uplink gain of the uplink; and the number of the first and second groups,
turning off the downlink and the downlink.
Preferably, the processor 801 is further configured to read a program in the memory, and execute the following processes:
and generating at least two test signals by using a digital signal processing module in the downlink of the network coverage optimization equipment, wherein the bandwidth interval between the test signals is larger than the bandwidth of the working frequency band of the network coverage optimization equipment.
Preferably, the processor 801 is further configured to read a program in the memory, and execute the following processes:
calculating a bandwidth interval to be tested, in which passive intermodulation interference possibly exists, according to the respective frequency range of the at least two test signals;
traversing each bandwidth interval to be tested, adjusting the band-pass intervals of the first passive intermodulation filter and the second passive intermodulation filter according to the currently traversed bandwidth interval to be tested, and detecting to obtain the power of the intermodulation interference signal in the currently traversed bandwidth interval to be tested;
and selecting the maximum power of the intermodulation interference signals according to the detected power of the intermodulation interference signals in each bandwidth interval to be detected, and generating an evaluation index of the passive intermodulation interference.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (12)
1. A method for detecting passive intermodulation interference of network coverage optimization equipment is characterized by comprising the following steps:
generating a test signal by using a digital signal processing module in a downlink of the network coverage optimization equipment, filtering the test signal by using a first passive intermodulation filter, shifting a frequency spectrum, converting the frequency spectrum into a downlink radio frequency signal, and sending the downlink radio frequency signal to an antenna feeder system connected with the network coverage optimization equipment; receiving an uplink radio frequency signal fed back to an uplink of the network coverage optimization equipment by the antenna feed system, carrying out spectrum shifting and analog-to-digital conversion processing on the uplink radio frequency signal, and obtaining an intermodulation interference signal corresponding to the test signal after filtering processing by a second passive intermodulation filter;
and detecting the power of the intermodulation interference signal to generate an evaluation index of the passive intermodulation interference.
2. The method of testing as claimed in claim 1, wherein said step of generating a test signal using a digital signal processing module in a downlink of said network coverage optimization device comprises:
and generating at least two test signals by using a digital signal processing module in the downlink of the network coverage optimization equipment, wherein the bandwidth interval between the test signals is larger than the bandwidth of the working frequency band of the network coverage optimization equipment.
3. The method of claim 2, wherein the step of detecting the power of the intermodulation interference signal and generating an evaluation index of passive intermodulation interference comprises:
calculating a bandwidth interval to be tested, in which passive intermodulation interference possibly exists, according to the respective frequency range of the at least two test signals;
traversing each bandwidth interval to be tested, adjusting the band-pass intervals of the first passive intermodulation filter and the second passive intermodulation filter according to the currently traversed bandwidth interval to be tested, and detecting to obtain the power of the intermodulation interference signal in the currently traversed bandwidth interval to be tested;
and selecting the maximum power of the intermodulation interference signals according to the detected power of the intermodulation interference signals in each bandwidth interval to be detected, and generating an evaluation index of the passive intermodulation interference.
4. A detection method according to any one of claims 1-3, characterized in that after generating an evaluation index of passive intermodulation interference, the method comprises:
and when the evaluation index of the passive intermodulation interference indicates that the passive intermodulation interference exceeds a preset threshold, carrying out regulation and control treatment on the passive intermodulation interference.
5. The detection method according to claim 4, wherein the conditioning processing of the passive intermodulation interference comprises at least one of:
reducing the output power of the downlink radio frequency signal of the downlink;
reducing an uplink gain of the uplink; and the number of the first and second groups,
turning off the downlink and the downlink.
6. A network coverage optimization device, comprising a duplexer, and a downlink and an uplink respectively connected to the duplexer;
wherein the downlink comprises:
the digital signal processing module is used for generating a test signal;
the first passive intermodulation filter is used for filtering the test signal to obtain a first intermediate signal;
the digital-to-analog conversion and frequency spectrum shifting module is used for performing digital-to-analog conversion on the first intermediate signal, performing frequency spectrum shifting conversion on the first intermediate signal to convert a downlink radio frequency signal, transmitting the downlink radio frequency signal to the duplexer, and transmitting the downlink radio frequency signal to an antenna feeder system connected with the network coverage optimization equipment through the duplexer;
the uplink includes:
the frequency spectrum shifting and analog-to-digital conversion module is used for receiving an uplink radio frequency signal fed back by the antenna feed system through the duplexer and carrying out frequency spectrum shifting and analog-to-digital conversion processing on the uplink radio frequency signal to obtain a second intermediate signal;
the second passive intermodulation filter is used for filtering the second intermediate signal to obtain an intermodulation interference signal corresponding to the test signal;
and the detection processing module is used for detecting the power of the intermodulation interference signal and generating an evaluation index of the passive intermodulation interference.
7. The network coverage optimization device of claim 6,
the digital signal processing module is further configured to generate at least two test signals, where a bandwidth interval between the test signals is greater than a bandwidth of an operating frequency band of the network coverage optimization device.
8. The network coverage optimization device of claim 7, wherein the detection processing module comprises:
the power statistics module is used for calculating a bandwidth interval to be tested, in which the passive intermodulation interference possibly exists, according to the respective frequency range of the at least two test signals; traversing each bandwidth interval to be tested, adjusting the band-pass intervals of the first passive intermodulation filter and the second passive intermodulation filter according to the currently traversed bandwidth interval to be tested, and detecting to obtain the power of the intermodulation interference signal in the currently traversed bandwidth interval to be tested; and selecting the maximum power of the intermodulation interference signals according to the detected power of the intermodulation interference signals in each bandwidth interval to be detected, and generating an evaluation index of the passive intermodulation interference.
9. The network coverage optimization device of any one of claims 6-8, further comprising:
and the regulation and control module is used for carrying out regulation and control processing on the passive intermodulation interference when the evaluation index of the passive intermodulation interference indicates that the passive intermodulation interference exceeds a preset threshold.
10. The network coverage optimization device of claim 9, wherein the conditioning of the passive intermodulation interference comprises at least one of:
reducing the output power of the downlink radio frequency signal of the downlink;
reducing an uplink gain of the uplink; and the number of the first and second groups,
turning off the downlink and the downlink.
11. A network coverage optimization device, comprising: memory, processor and computer program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the method according to any of claims 1 to 5.
12. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
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