CN111757331B - Network coverage optimization equipment and its detection method for passive intermodulation interference - Google Patents

Abstract

The invention provides a network coverage optimization device and a detection method for passive intermodulation interference thereof. The invention can automatically detect the passive intermodulation performance of the antenna feeder system externally connected to the equipment by adding passive intermodulation detection and control functions to the network coverage optimization equipment. Moreover, the embodiment of the present invention can timely report an alarm when the passive intermodulation index is unqualified, and automatically control the downlink output power of the equipment to ensure normal uplink noise floor and avoid interference to the source base station. In addition, the embodiment of the present invention can also independently perform passive intermodulation detection and control of external antenna feeders for each downlink radio frequency output port, and remotely/locally trigger the passive intermodulation detection function to facilitate troubleshooting. The method described in the embodiment of the present invention can be applied to various network coverage optimization devices, overcomes the defects of difficult construction and inability to solve intermodulation interference in existing technical methods, and has the characteristics of low cost, high platformization, and strong stability, and has the advantages of Very good marketing prospects.

Description

Network coverage optimization equipment and its passive intermodulation interference detection method

technical field

Embodiments of the present invention relate to the field of communication technologies, and in particular to a network coverage optimization device and a method for detecting passive intermodulation interference thereof.

Background technique

In the wireless coverage scheme of the prior art, active distributed network coverage optimization equipment + passive antenna feeder system are more and more applied. The traditional antenna feeder system has become the mainstream solution for indoor coverage because it does not require power supply, is low in cost, high in reliability, and easy to expand. Then, due to the large number of passive components and antenna nodes, the distribution network is complex, and cannot be monitored by itself, it deteriorates during long-term use and produces passive intermodulation (PIM, Passive Inter-Modulation), which affects the active room distribution system and base station noise.

In traditional technology, a portable intermodulation detector is usually used for PIM detection, which is mainly inspected at the initial stage of installation. When testing, the passive antenna feeder system needs to be disconnected from the active network coverage optimization equipment and connected to the passive intermodulation test instrument. The above detection scheme will bring about two impacts. One is that there is no signal coverage in the entire area after the connection is disconnected, which affects the signal quality of the coverage area; the other is that the portable intermodulation tester will send narrowband CW signals and pass through strong narrowband continuous waves ( CW, Continuous Wave) signal sweeps the working frequency band area, causing interference to the signal coverage cell.

In order to increase the convenience of construction, another technical solution in the industry is to build a passive intermodulation detector in the base station, which can test the passive intermodulation in the base station equipment at the engineering site.

In the prior art, the built-in or external passive intermodulation detector is used to test the passive intermodulation scheme. On the one hand, it increases the cost, on the other hand, the construction is inconvenient, and it is difficult to solve the interference caused by the passive intermodulation. If used in large quantities in an indoor distribution system, its cost will be high.

Contents of the invention

An object of the embodiments of the present invention is to provide a network coverage optimization device and its passive intermodulation interference detection method, which overcomes the difficulties in construction and intermodulation interference existing in existing detection methods, and has the advantages of low implementation cost and The advantages of strong stability.

An embodiment of the present invention provides a method for detecting passive intermodulation interference of a network coverage optimization device,

The digital signal processing module in the downlink of the network coverage optimization device is used to generate a test signal, and the test signal is filtered by the first passive intermodulation filter and converted into a downlink radio frequency signal by spectrum shifting, and then sent to the An antenna feeder system connected to the network coverage optimization device; and, receiving an uplink radio frequency signal fed back from the antenna feeder system to the uplink of the network coverage optimization device, and performing spectrum shift and analog-to-digital conversion processing on the uplink radio frequency signal, And after being filtered by the second passive intermodulation filter, the intermodulation interference signal corresponding to the test signal is obtained;

The power of the intermodulation interference signal is detected to generate an evaluation index of passive intermodulation interference.

Preferably, the step of using the digital signal processing module in the downlink of the network coverage optimization device to generate a test signal includes:

The digital signal processing module in the downlink of the network coverage optimization device is used to generate at least two test signals, and the bandwidth interval between the test signals is greater than the bandwidth of the working frequency band of the network coverage optimization device.

Preferably, the step of detecting the power of the intermodulation interference signal and generating an evaluation index of passive intermodulation interference includes:

According to the respective frequency band ranges of the at least two test signals, calculate a bandwidth interval to be tested in which passive intermodulation interference may exist;

Traversing each of the bandwidth intervals to be measured, adjusting the bandpass intervals of the first passive intermodulation filter and the second passive intermodulation filter according to the currently traversed bandwidth interval to be measured, and detecting that the current The power of the intermodulation interference signal under the traversed bandwidth interval to be measured;

According to the detected powers of the intermodulation interference signals in each of the bandwidth intervals to be measured, a maximum power among them is selected to generate an evaluation index of passive intermodulation interference.

Preferably, after generating the evaluation index of passive intermodulation interference, the method includes:

When the evaluation index of the passive intermodulation interference indicates that the passive intermodulation interference exceeds a predetermined threshold, the regulation processing of the passive intermodulation interference is performed.

Preferably, the regulation and treatment of passive intermodulation interference includes at least one of the following treatments:

reducing the output power of the downlink radio frequency signal;

reducing the uplink gain of the uplink; and,

Turn off the downlink and downlink.

The embodiment of the present invention also provides a network coverage optimization device, including a duplexer, and a downlink and an uplink respectively connected to the duplexer;

Wherein, the downlink includes:

A digital signal processing module for generating test signals;

a first passive intermodulation filter, configured to filter the test signal to obtain a first intermediate signal;

The digital-to-analog conversion and spectrum shifting module is used to perform digital-to-analog conversion on the first intermediate signal, perform spectrum shifting and convert it into a downlink radio frequency signal, and then send it to the duplexer, and send it to the network coverage through the duplexer Optimize the antenna feeder system connected to the device;

The uplink includes:

The spectrum shifting and analog-to-digital conversion module is configured to receive the uplink radio frequency signal fed back by the antenna feeder system through the duplexer, and perform spectrum shift and analog-to-digital conversion processing on the uplink radio frequency signal to obtain a second intermediate signal;

a second passive intermodulation filter, configured to filter the second intermediate signal to obtain an intermodulation interference signal corresponding to the test signal;

The detection processing module is configured to detect the power of the intermodulation interference signal, and generate an evaluation index of passive intermodulation interference.

Preferably, the digital signal processing module is further configured to generate at least two test signals, and the bandwidth interval between the test signals is greater than the bandwidth of the working frequency band of the network coverage optimization device.

Preferably, the detection processing module includes:

A power statistics module, configured to calculate, according to the respective frequency band ranges of the at least two test signals, the bandwidth intervals to be tested that may have passive intermodulation interference; to traverse each of the bandwidth intervals to be tested, according to the currently traversed bandwidth intervals to be tested Measure the bandwidth interval, adjust the bandpass interval of the first passive intermodulation filter and the second passive intermodulation filter, and detect the power of the intermodulation interference signal under the bandwidth interval to be measured currently traversed and, according to the detected power of the intermodulation interference signal in each of the bandwidth intervals to be measured, select the maximum power among them, and generate an evaluation index of passive intermodulation interference.

Preferably, the network coverage optimization device further includes:

A regulation module, configured to perform regulation processing on the passive intermodulation interference when the evaluation index of the passive intermodulation interference indicates that the passive intermodulation interference exceeds a predetermined threshold.

Preferably, the regulation and treatment of passive intermodulation interference includes at least one of the following treatments:

reducing the output power of the downlink radio frequency signal;

reducing the uplink gain of the uplink; and,

Turn off the downlink and downlink.

An embodiment of the present invention also provides a network coverage optimization device, including: a memory, a processor, and a computer program stored on the memory and operable on the processor. When the computer program is executed by the processor, the above The steps of the method.

An embodiment of the present invention also 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 above method are realized.

The network coverage optimization equipment and its passive intermodulation interference detection method provided by the embodiments of the present invention can automatically detect the passive interference of the antenna feeder system external to the equipment by adding passive intermodulation detection and control functions to the network coverage optimization equipment. intermodulation performance. Moreover, the embodiment of the present invention can timely report an alarm when the passive intermodulation index is unqualified, and automatically control the downlink output power of the equipment to ensure normal uplink noise floor and avoid interference to the source base station. In addition, the embodiments of the present invention can independently perform passive intermodulation detection and control of external antenna feeders for each downlink radio frequency output port, and remotely/locally trigger the passive intermodulation detection function to facilitate troubleshooting. The method described in the embodiment of the present invention can be applied to various network coverage optimization devices, overcomes the defects of difficult construction and inability to solve intermodulation interference in existing technical methods, and has the characteristics of low cost, high platformization, and strong stability, and has the advantages of Very good marketing prospect.

Description of 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 embodiment. The drawings are only for the purpose of illustrating a preferred embodiment and are not to be considered as limiting the invention. Also throughout the drawings, the same reference numerals are used to designate the same parts. In the attached picture:

FIG. 1 is a schematic diagram 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 a gain control method of a network coverage optimization device according to an 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 provided by an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a network coverage optimization device provided by an embodiment of the present invention;

Fig. 5 is a kind of example figure of the DDS generation module that the embodiment of the present invention adopts;

Fig. 6 is a kind of example diagram of the phase accumulator in the DDS generation module of the embodiment of the present invention;

FIG. 7 is an example 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 optimization device provided by an embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein, for example, can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus. "And/or" in the specification and claims 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 methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

The embodiment of the present invention provides a network coverage optimization device and its gain control method. The gain control is automatically performed on the network coverage optimization device side according to the information source, which can avoid network problems caused by parameter mismatch due to manual setting of parameters, and at the same time reduce the cost of the device. maintenance costs and improve the coverage effect of the network optimization system.

The network coverage optimization device in the embodiment of the present invention includes but not limited to digital repeater, optical fiber distribution system, micro repeater, trunk amplifier and other devices. These devices transmit signals from a source (such as a base station) to a coverage enhancement unit in a wireless or wired manner, and receive signals from the coverage enhancement unit and transmit them back to the source. The coverage enhancement unit includes equipment such as a passive antenna feeder system, a remote unit, and a coverage antenna.

For example, taking a digital repeater as an example, the existing digital repeater mainly includes an optical fiber repeater and a wireless repeater. Figure 1 and Figure 2 show the passive interaction of the network coverage optimization device according to the embodiment of the present invention. Two application scenarios of the detection method for tuning interference, where Fig. 1 is a distributed optical fiber repeater, and Fig. 2 is a stand-alone wireless repeater. In this paper, the digital repeater is mostly used as an example for illustration. It should be pointed out 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 Figure 1, the optical fiber repeater consists of a radio frequency access unit (RAU, RF Access Unit) and a high power remote unit (HRU, High power Remote Unit). In the forward link (downlink from the source to the digital repeater), the radio frequency access unit enters the downlink radio frequency signal of GSM, NB-IoT, FDD-LTE and other sources into the optical fiber repeater through wired coupling After being converted into a digital signal, it is converted into an optical signal by photoelectricity and then transmitted to the remote unit; the high-power remote unit converts the digital signal sent by the radio frequency access unit into a radio frequency signal to realize GSM, NB-IoT, FDD- Wireless coverage of signals such as LTE. In the reverse link (from the digital repeater to the source), the high-power remote unit converts the wirelessly received uplink radio frequency signal into a digital signal and transmits it to the radio frequency access unit; The digital signal is converted into an uplink radio frequency signal, which is sent back to the source through a wired method. The radio frequency access unit supports the remote monitoring and management function of the remote unit to which it belongs.

As shown in Figure 2, the digital wireless repeater enters the downlink radio frequency signals of GSM, NB-IoT, FDD-LTE and other sources into the digital wireless repeater through wireless coupling, and converts them into digital signals after low-noise amplification. Digital processing, and then converted into radio frequency signals to achieve wireless coverage of GSM, NB-IoT, FDD-LTE and other signals after power amplification; at the same time, user signals enter the digital wireless repeater system through wireless reception, and undergo digital-to-analog conversion/digital After processing/power amplification, the signal is transmitted back to the source via wireless.

An optical fiber distribution system generally includes: a radio frequency access unit connected to a signal source, an extension unit connected to the access unit, and multiple remote units connected to the extension unit. The structure of the optical fiber distributed system is similar to the digital repeater shown in Figure 1, the difference is that an expansion unit is added to the radio frequency access unit and the remote unit, thereby expanding the access capability and coverage of the system. Specifically, the extension unit may be respectively connected to the radio frequency access unit and the remote unit through an optical fiber.

For the specific structure of the micro-repeater and the trunk amplifier, reference may be made to the related introductions of the prior art, and in order to save space, details are not repeated in this paper.

Please refer to Fig. 3, the embodiment of the present invention provides a method for detecting passive intermodulation interference of network coverage optimization equipment. Advantages of low cost and strong stability. Please refer to Figure 3, the method includes:

Step 31, use the digital signal processing module in the downlink of the network coverage optimization device to generate a test signal, filter the test signal through the first passive intermodulation filter and perform spectrum shifting to convert it into a downlink radio frequency signal and send it To the antenna feeder system connected to the network coverage optimization device; and, receiving the uplink radio frequency signal fed back by the antenna feeder system to the uplink of the network coverage optimization device, and performing spectrum shift and modulus on the uplink radio frequency signal After conversion processing and filtering processing by the second passive intermodulation filter, the intermodulation interference signal corresponding to the test signal is obtained.

Step 32, detecting the power of the intermodulation interference signal, and generating an evaluation index of 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 processing of the passive intermodulation interference is performed. Specifically, the regulation processing of the passive intermodulation interference includes at least one of the following processing:

reducing the output power of the downlink radio frequency signal;

reducing the uplink gain of the uplink; and,

Turn off the downlink and downlink.

In addition, the embodiment of the present invention may also generate an alarm signal and report it to the network management to remind the network management personnel to deal with it in a timely manner when performing the above-mentioned control and processing.

In this way, the embodiment of the present invention adds a function including detection of passive intermodulation and processing of passive intermodulation interference to each active network coverage optimization device, through existing hardware platforms and traditional passive devices connect. When the device is started or restarted for the first time, the passive intermodulation detection function is automatically activated, and the generated intermodulation is processed to reduce the noise floor interference to the base station.

Through the above steps, the embodiment of the present invention adds passive intermodulation detection and control functions to the network coverage optimization device, which can automatically detect the passive intermodulation performance of the antenna feeder system external to the device. Moreover, the embodiment of the present invention can timely report an alarm when the passive intermodulation index is unqualified, and automatically control the downlink output power of the equipment to ensure normal uplink noise floor and avoid interference to the source base station. In addition, the embodiments of the present invention can independently perform passive intermodulation detection and control of external antenna feeders for each downlink radio frequency output port, and remotely/locally trigger the passive intermodulation detection function to facilitate troubleshooting. The method described in the embodiment of the present invention can be applied to various network coverage optimization devices, overcomes the defects of difficult construction and inability to solve intermodulation interference in existing technical methods, and has the characteristics of low cost, high platformization, and strong stability, and has the advantages of Very good marketing prospect.

Preferably, in the above-mentioned step 31, the embodiment of the present invention can generate the above-mentioned test signal in the following manner: use the digital signal processing module in the downlink of the network coverage optimization device to generate at least two test signals, and the distance between the test signals The bandwidth interval is greater than the bandwidth of the working frequency band of the network coverage optimization device.

In the above step 32, in the embodiment of the present invention, according to the respective frequency ranges of the at least two test signals, the bandwidth intervals to be tested may be calculated where passive intermodulation interference may exist; then, each of the bandwidth intervals to be tested is traversed, According to the currently traversed bandwidth interval to be measured, adjust the bandpass intervals of the first passive intermodulation filter and the second passive intermodulation filter, and detect the bandpass intervals under the currently traversed bandwidth interval to be measured. The power of the intermodulation interference signal; according to the detected power of the intermodulation interference signal under each of the bandwidth intervals to be measured, select the maximum power among them to generate an evaluation index of passive intermodulation interference.

For example, assuming that two test signals are generated, the respective frequency bands are F1 and F2, then there may be passive intermodulation interference, which may include third-order intermodulation interference (frequency bands are 2F1-F2 and 2F2-F1), fifth-order intermodulation interference (Frequency points are 3F1-2F2 and 3F2-2F1) or other high-order intermodulation interference, the bandwidth range to be tested is the frequency band where the above-mentioned high-order intermodulation interference is located. Since there may be multiple high-order intermodulation interferences, the embodiment of the present invention can traverse multiple high-order intermodulation interferences, and adjust the first wireless The band-pass intervals of the source intermodulation filter and the second passive intermodulation filter enable corresponding high-order intermodulation interference products to pass through the above filters for power detection. In addition, since the power of multiple intermodulation products may be detected, an evaluation index of intermodulation interference may be generated based on the maximum power among them. For example, when the maximum power exceeds a certain preset threshold, it is prompted that regulation and processing of passive intermodulation interference is required.

The method for detecting passive intermodulation interference of the network coverage optimization device according to the embodiment of the present invention is introduced above, and the network coverage optimization device implementing the above detection method will be further provided below.

Please refer to FIG. 4 , a network coverage optimization device 40 provided by an embodiment of the present invention. Specifically, the network coverage optimization device 40 may be the optical repeater shown in FIG. 1 , or the wireless repeater shown in FIG. 2 It can also be equipment such as optical fiber distribution system, micro-repeater or trunk amplifier. As shown in FIG. 4, the network coverage optimization device 40 includes: a duplexer 41, and a downlink and an uplink respectively connected to the duplexer 41;

Wherein, the downlink includes:

The digital signal processing module 42 is used for generating test signals.

A first passive intermodulation filter 43, configured to filter the test signal to obtain a first intermediate signal;

The digital-to-analog conversion and spectrum shifting module 44 is configured to perform digital-to-analog conversion on the first intermediate signal, perform spectrum shifting and convert it into a downlink radio frequency signal, and then send it to the duplexer, and send it to the duplexer 41 through the duplexer 41 The antenna feeder system connected to the network coverage optimization equipment;

The uplink includes:

The spectrum shift and analog-to-digital conversion module 45 is configured to receive the uplink radio frequency signal fed back by the antenna feeder system through the duplexer 41, and perform spectrum shift and analog-to-digital conversion processing on the uplink radio frequency signal to obtain a second intermediate signal ;

The second passive intermodulation filter 46 is configured to filter the second intermediate signal to obtain an intermodulation interference signal corresponding to the test signal;

The detection processing module 47 is configured to detect the power of the intermodulation interference signal, and generate an evaluation index of passive intermodulation interference.

Preferably, the digital signal processing module is further configured to generate at least two test signals, and the bandwidth interval between the test signals is greater than the bandwidth of the working frequency band of the network coverage optimization device.

Preferably, the multiple modules in the above network coverage optimization device can be implemented in the remote unit of the optical fiber repeater, or implemented inside the wireless repeater. Specifically, each existing module in an existing network coverage optimization device is used for implementation. Figure 4 shows the specific implementation of each module, where the triangle represents the power amplifier, the circle with a built-in "×" represents the mixer, ADC represents the analog-to-digital converter, DAC represents the digital-to-analog converter, and "orthogonalization" Represents the signal orthogonalization processing module, "4 times extraction" represents the extraction processing module, "4 times interpolation" represents the interpolation processing module, "DDS generation module" represents the direct digital frequency synthesizer (Direct Digital Synthesizer), used to Generate a digital signal.

It can be seen that the digital signal processing module 42 can adopt the DDS generating module in the network coverage optimization device, and the digital-to-analog conversion and spectrum shifting module 44 can include an interpolation processing module, a DAC, a mixer and an interpolation processing module in the downlink of the network coverage optimization device. power amplifier. 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 orthogonal processing module, an extraction 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 it is necessary to perform the detection in Figure 3, the two bypass switches can be disconnected, so that the first and second passive intermodulation filters are connected to the corresponding uplink and downlink links; after the detection is completed, the The two bypass switches are turned off, so that the first and second passive intermodulation filters are bypassed. At this time, the first and second passive intermodulation filters are no longer located in the corresponding add/drop links.

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 jointly realize the generation and transmission of test signals. Preferably, the digital signal processing module 42 can generate two broadband signals (digital signals) whose frequency interval is greater than the bandwidth of the network coverage optimization equipment, and then processed by modules such as DAC to convert the digital signal to an intermediate frequency signal, and convert the digital signal to an intermediate frequency signal through a mixer. Generate radio frequency signals, and use the RF power amplifier link of FDD to amplify.

For example, the digital signal processing module 42 can use a DDS generating module to transmit CW continuous waveforms or DC waveforms at different frequency intervals (100KHz-60MHz) and at different power levels (maximum 0dBfs). In order to prevent the signal from interfering with the working frequency band where the base station is located, the frequency band of the signal generated by the module is outside the working frequency band of the network coverage optimization device, and the power level is lower than the working signal of the network coverage optimization device. In addition, signal generation can be time-divided to ensure simultaneous transmission and reception. The transmitted signal may be transmitted intermittently.

Figure 5 shows a schematic diagram of the structure of the DDS generation module. Figure 6 shows a schematic diagram of the structure of the phase accumulator in the DDS generation module. The phase accumulator is composed of an N-bit accumulator and an N-bit register cascaded. As an example, in the embodiment of the present invention, the DDS production principle, its functional requirement produces 2-channel numerically controlled oscillator (NCO, numerically controlled oscillator) signal, and the index of the dynamic range without stray, namely SFDR>96dBc, frequency resolution 0.1MHz. Specifically, under the drive of the reference clock, the phase accumulator linearly accumulates the frequency control word, and the obtained phase code addresses the waveform memory to make it output the corresponding amplitude code, that is, the signal is mixed.

As a preferred manner, the digital-to-analog conversion and spectrum shifting module 44 in FIG. 4 not only transmits the signal required for the network coverage optimization equipment working frequency band, but also transmits the test signal for intermodulation detection. Considering the influence of the out-of-band signal on the in-band signal, the amplitude of the transmitted signal usually needs to be smaller than that of the working signal. In addition, considering that the out-of-band signal is affected by the analog filter, the embodiment of the present invention can widen the operating bandwidth of the filter, duplexer or multiplexer, so that the test signal for intermodulation detection and the active network coverage optimization device can work The signal is issued 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, which can amplify the intermodulation product by using the FDD radio frequency receiving link, and then convert The intermediate frequency signal is converted into a digital signal by being sampled by the ADC processor, and the second passive intermodulation filter 46 and the detection processing module 47 filter and analyze the intermodulation product.

Specifically, the radio frequency processing module (including a power amplifier and a mixer) of the spectrum shifting and analog-to-digital conversion module 45 is used to receive the reflected intermodulation products and amplify them through the radio frequency uplink so that they can be recognized by the ADC.

The intermodulation product is sampled by the ADC and transferred to the baseband signal, filtered by the second passive intermodulation filter to remove irrelevant signals, and entered into the power statistics module for analysis. The power statistics module is mainly to count the input power of the AD front-end, so as to adjust the system state according to the requirements of the active indoor distribution system for intermodulation products. The functional block diagram of its power statistics function is shown in Figure 7.

Specifically, the power statistics module is configured to calculate, according to the respective frequency band ranges of the at least two test signals, the bandwidth intervals to be tested where passive intermodulation interference may exist; to traverse each bandwidth interval to be tested, according to the current Traversing the bandwidth interval to be measured, adjusting the bandpass intervals of the first passive intermodulation filter and the second passive intermodulation filter, and detecting that the mutual adjusting the power of the interference signal; and, according to the detected power of the intermodulation interference signal in each of the bandwidth intervals to be measured, selecting the maximum power among them to generate an evaluation index of passive intermodulation interference.

For uplink intermodulation products, each time after controlling the DDS to send a test signal, read the power value (such as the minimum value, maximum value and average value, etc.) inside the power statistics module (specifically, it can be realized by FPGA), and record it to the specified in the file. The collected intermodulation product data is used for subsequent processing, analysis and control of active distributed systems.

Preferably, the network coverage optimization device 40 also includes:

The regulating module 48 is configured to perform regulating processing on the passive intermodulation interference when the evaluation index of the passive intermodulation interference indicates that the passive intermodulation interference exceeds a predetermined threshold. Preferably, the regulation processing of 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 the uplink gain of the uplink; and, turning off The downlink and downlink.

Specifically, the control module may include an analysis intermodulation product module and an anti-interference module, which are used to analyze and judge the size of the intermodulation product signal, and equivalently convert it into a power level that affects the standard signal, and judge the signal exceeding the predetermined requirement as interference , and start the anti-jamming module.

The intermodulation product analysis module has a built-in digital filter and frequency shifting function. According to the different signals, the corresponding algorithm is used to obtain the possible frequency bands of the intermodulation products, and the digital filter traverses the possible frequency bands of the corresponding intermodulation products for comprehensive calculation. Obtain the uplink passive intermodulation interference value.

The anti-jamming module mainly realizes two functions, one is to automatically adjust the uplink gain and downlink output power according to the size of the identified intermodulation products, and reduce the impact of passive intermodulation on the noise floor of the base station; the other is to actively report to the network management or alarm platform when the intermodulation is abnormal , you can also turn off the digital signal and wait for processing.

Please refer to FIG. 8 , an embodiment of the present invention provides another schematic structural diagram of a network coverage optimization device 800, including: a processor 801, a transceiver 802, a memory 803, and a bus interface, wherein:

The processor 801 is configured to read the program in the memory, and execute the following process: use the digital signal processing module in the downlink of the network coverage optimization device to generate a test signal, and pass the test signal through the first passive interactive tune filter filtering processing and perform spectrum shifting and convert it into a downlink radio frequency signal; perform spectrum shifting and analog-to-digital conversion processing on the uplink radio frequency signal received by the transceiver 802, and after filtering through the second passive intermodulation filter, obtaining an intermodulation interference signal corresponding to the test signal; and detecting the power of the intermodulation interference signal to generate an evaluation index of passive intermodulation interference.

The transceiver 802 is configured to send the downlink radio frequency signal to the antenna feeder system connected to the network coverage optimization device, and receive the uplink radio frequency signal fed back by the antenna feeder system to the uplink of the network coverage optimization device .

In FIG. 8 , the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 801 and various circuits of memory represented by memory 803 are linked together. The bus architecture can also link together various other circuits such as peripherals, voltage regulators, and power management circuits, etc., which are well known in the art and therefore will not be further described herein. The bus interface provides the interface. Transceiver 802 may be a plurality of elements, including a transmitter and a receiver, providing a means for communicating with various other devices over transmission media.

The processor 801 is responsible for managing the bus architecture and general processing, and the memory 803 can store data used by the processor 801 when performing operations.

Preferably, the processor 801 is also used to read the program in the memory and execute the following process:

When the evaluation index of the passive intermodulation interference indicates that the passive intermodulation interference exceeds a predetermined threshold, the regulation processing of the passive intermodulation interference is performed.

Preferably, the regulation and treatment of passive intermodulation interference includes at least one of the following treatments:

reducing the output power of the downlink radio frequency signal;

reducing the uplink gain of the uplink; and,

Turn off the downlink and downlink.

Preferably, the processor 801 is also used to read the program in the memory and execute the following process:

The digital signal processing module in the downlink of the network coverage optimization device is used to generate at least two test signals, and the bandwidth interval between the test signals is greater than the bandwidth of the working frequency band of the network coverage optimization device.

Preferably, the processor 801 is also used to read the program in the memory and execute the following process:

According to the respective frequency band ranges of the at least two test signals, calculate a bandwidth interval to be tested in which passive intermodulation interference may exist;

Traversing each of the bandwidth intervals to be measured, adjusting the bandpass intervals of the first passive intermodulation filter and the second passive intermodulation filter according to the currently traversed bandwidth interval to be measured, and detecting that the current The power of the intermodulation interference signal under the traversed bandwidth interval to be measured;

According to the detected powers of the intermodulation interference signals in each of the bandwidth intervals to be measured, a maximum power among them is selected to generate an evaluation index of passive intermodulation interference.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the embodiments provided in this application, it should be understood that the disclosed devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part 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, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

If the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media capable of storing program codes such as U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. A method for detecting passive intermodulation interference of a network coverage optimization device, comprising:

generating a test signal by using a digital signal processing module in the downlink of the network coverage optimization equipment, filtering the test signal by a first passive intermodulation filter, performing spectrum shifting and converting the test signal into a downlink radio frequency signal, and then transmitting the downlink radio frequency signal to an antenna feed system connected with the network coverage optimization equipment; the antenna feed system receives an uplink radio frequency signal fed back to the uplink of the network coverage optimization device, carries out frequency spectrum shifting and analog-to-digital conversion processing on the uplink radio frequency signal, and obtains an intermodulation interference signal corresponding to the test signal after filtering processing by a second passive intermodulation filter;

detecting the power of the intermodulation interference signal, and generating an evaluation index of passive intermodulation interference;

the step of detecting the power of the intermodulation interference signal and generating an evaluation index of passive intermodulation interference comprises the following steps:

according to the respective frequency range of at least two test signals, calculating a bandwidth interval to be tested, wherein passive intermodulation interference possibly exists in the bandwidth interval to be tested;

traversing each bandwidth interval to be tested, adjusting the bandpass 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 under 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 under each bandwidth interval to be detected, and generating an evaluation index of passive intermodulation interference.

2. The method of detecting as claimed in claim 1, wherein the step of generating the test signal using the digital signal processing module in the downlink of the network coverage optimization device comprises:

and generating at least two test signals by utilizing 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 detection method according to any of claims 1-2, characterized in that after generating the 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, regulating and controlling the passive intermodulation interference.

4. The detection method of claim 3, wherein the passive intermodulation interference regulation process 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; the method comprises the steps of,

and closing the downlink and the downlink.

5. A network coverage optimization device comprising a diplexer, and a downlink and an uplink respectively connected to the diplexer;

wherein the downlink includes:

the digital signal processing module is used for generating a test signal;

the first passive intermodulation filter is used for carrying out filtering processing on the test signal to obtain a first intermediate signal;

the digital-to-analog conversion and frequency spectrum shifting module is used for carrying out digital-to-analog conversion on the first intermediate signal, shifting and converting the frequency spectrum into a downlink radio frequency signal, sending the downlink radio frequency signal to the duplexer, and sending the downlink radio frequency signal to an antenna feed 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 the 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 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;

the detection processing module is used for detecting the power of the intermodulation interference signal and generating an evaluation index of passive intermodulation interference;

the detection processing module comprises:

the power statistics module is used for calculating a bandwidth interval to be tested, in which passive intermodulation interference is possible, according to the respective frequency range of at least two test signals; traversing each bandwidth interval to be tested, adjusting the bandpass 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 under the currently traversed bandwidth interval to be tested; and selecting the maximum power of the intermodulation interference signal according to the detected power of the intermodulation interference signal under each bandwidth interval to be detected, and generating an evaluation index of passive intermodulation interference.

6. The network coverage optimization device of claim 5, wherein,

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.

7. The network coverage optimization device of any of claims 5-6, 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.

8. The network coverage optimization device of claim 7, wherein the passive intermodulation interference regulation process 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; the method comprises the steps of,

and closing the downlink and the downlink.

9. A network coverage optimization device, comprising: memory, a processor and a computer program stored on the memory and executable on the processor, which, when executed by the processor, performs the steps of the method according to any one of claims 1 to 4.

10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, implements the steps of the method according to any one of claims 1 to 4.

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