CN114567393B - Down link self-detection method of remote radio unit - Google Patents
Down link self-detection method of remote radio unit Download PDFInfo
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- H04B17/29—Performance testing
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Abstract
The invention provides a downlink self-detection method of a remote radio unit, and relates to the technical field of wireless communication. The method comprises the following steps: the self-test signal is inserted before digital up-conversion in the downlink. After traversing the downlink transmit chain, the self-test signal is coupled into the self-test receive path at the output of the filter. The received signal from the detection receiving channel is collected. And detecting the gain of the downlink of the remote radio unit, the adjacent channel interference and the error vector according to the received signal to obtain a detection result. The method utilizes the protection period of a special time slot in a wireless frame structure to transmit a self-test signal, and the self-test signal is coupled to a receiving channel at the output end of a filter, so that the self-detection of the downlink of a remote radio unit is carried out according to the coupled received signal. After the self-test signal passes through the complete downlink receiving channel, the downlink gain, the radio frequency adjacent channel interference and the error vector are periodically detected, so that the purpose of performing performance self-test on the downlink of the radio frequency remote unit is realized.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a downlink self-detection method of a remote radio unit.
Background
In wireless communication, wireless access network interface opening, hardware white-box, software opening and network intellectualization are important trends. Network intelligence puts two demands on devices in the network: 1. the equipment can intelligently realize deployment and new function application; 2. the device has strong self-detection capability, can find problems by itself and even solve problems. The remote radio unit (RRU, remoteRadioUnit) is a core network element in a wireless communication network (2 g,3g,4g,5g,6g … …) that is responsible for converting digital signals into analog radio frequency signals and transmitting the radio frequency signals into a wireless environment, and may also receive radio frequency signals and convert the received radio frequency signals into digital signals. Therefore, the intelligentization of the remote radio unit is an important direction of future product development.
Remote units are typically deployed outdoors and operate in a relatively harsh environment. Meanwhile, with the continuous improvement of the requirements on wireless network coverage and the application of 5G technology, multi-channel (such as 64 channels) products and products with larger output power are deployed in a large quantity, the products have large volume and heavy weight, the cost of manual maintenance is greatly increased, and according to experience data, if one remote radio unit needs to return to a factory to position the problem and overhaul the cost and the cost of the products are approximately 1:1. and after returning to the factory, about 30% of the products belong to the problem-free products, so that a great deal of manpower and financial resources are wasted.
Therefore, the remote radio unit has self-detection capability and has great significance for reducing maintenance cost. At present, the self-detection capability of the remote radio unit is very weak, and the self-detection of the uplink of the remote radio unit cannot be realized, so that the maintenance of the product on site is greatly dependent on manual maintenance.
Disclosure of Invention
The invention aims to provide a self-detection method for a downlink of a remote radio unit, which is used for solving the problem that the self-detection of the downlink of the remote radio unit cannot be realized in the prior art.
Embodiments of the present invention are implemented as follows:
the embodiment of the application provides a downlink self-detection method of a remote radio unit, which comprises the following steps:
inserting a self-test signal prior to digital up-conversion of the downlink;
after traversing the downlink transmitting link, the self-test signal is coupled to the self-detection receiving channel at the output end of the filter;
collecting a receiving signal of a self-detection receiving channel;
and detecting the gain of the downlink of the remote radio unit, the adjacent channel interference and the error vector according to the received signal to obtain a detection result.
In some embodiments of the present invention, the step of coupling the self-test signal into the self-test receiving channel at the output of the filter after traversing the downlink transmission link includes:
after traversing the complete downlink transmitting link, the self-test signal is coupled to the self-test receiving channel through a microstrip line at the filter output end of any channel.
In some embodiments of the present invention, after the self-test signal traverses the complete downlink transmission link, the step of coupling the filter output end of any channel to the self-test receiving channel through the microstrip line includes:
a power divider is arranged between the filter output ends of two adjacent channels for combining.
In some embodiments of the invention, the step of inserting the self-test signal before digital up-conversion of the downlink includes:
in the radio frame structure of TDD, according to the TDD configuration, the self-test signal is inserted into the GP time window of a special slot in the radio frame structure.
In some embodiments of the present invention, the step of coupling the self-test signal into the self-test receiving channel at the output of the filter after traversing the downlink transmission link includes:
the self-test signal sequentially passes through digital up-conversion, peak clipping, digital predistortion, a digital-to-analog converter, a power amplifier and a filter to traverse a complete downlink transmitting link;
the self-test signal is coupled to the receiving channel through a microstrip line via the output end of the filter, a single-pole double-throw switch is arranged between the receiving channel and the radio frequency front end and is used for switching between a self-detection mode and a conventional receiving mode, wherein the single-pole double-throw switch is controlled by a digital chip, is switched to the self-detection mode in a GP time window and is switched to the conventional receiving mode in other time windows;
in the GP time window, the self-test signals are input into the data acquisition module after analog-to-digital conversion and digital down-conversion in sequence.
In some embodiments of the present invention, the step of detecting an error vector of a downlink of the remote radio unit according to the received signal to obtain a detection result includes:
using the formula
Calculating a vector between a self-test signal to be transmitted and a received self-test signalError, wherein k is the kth sampling point, X (k) is the self-test signal to be transmitted, Y (k) is the received self-test signal, and N is the number of signal sampling points;
the vector error is compared with a third preset threshold to detect the signal amplitude and phase effects of the entire downlink.
In some embodiments of the present invention, the step of detecting the gain of the downlink of the remote radio unit according to the received signal to obtain a detection result includes:
calculating the average power of the self-test signal to be transmitted and the average power of the received self-test signal by a digital power meter based on one symbol period;
subtracting the average power of the self-test signal to be transmitted from the average power of the received self-test signal through a comparator, and taking an absolute value;
if the absolute value is larger than the first preset threshold, a link gain abnormality alarm is sent out, and if the absolute value is smaller than the first preset threshold, the next detection period is entered.
In some embodiments of the present invention, the step of detecting the radio adjacent channel interference of the downlink of the remote radio unit according to the received signal to obtain a detection result includes:
after carrying out frequency domain analysis on the received signal, calculating the average power of the signal in the whole sampling bandwidth, wherein the whole sampling bandwidth does not comprise carrier bandwidth;
and comparing the average power of the signal with a second preset threshold to judge whether the digital predistortion function in the downlink is in a normal working state.
In some embodiments of the present invention, the self-test signal has a length of two symbol lengths, and the self-test signal is identical in two symbol lengths.
In some embodiments of the present invention, the step of collecting the received signal from the detection receiving channel includes:
data of two symbol lengths are collected.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:
the invention provides a downlink self-detection method of a remote radio unit, which comprises the following steps: the self-test signal is inserted before digital up-conversion in the downlink. After traversing the downlink transmit chain, the self-test signal is coupled into the self-test receive path at the output of the filter. The received signal from the detection receiving channel is collected. And detecting the gain of the downlink of the remote radio unit, the adjacent channel interference and the error vector according to the received signal to obtain a detection result. The method comprises the steps of firstly inserting a self-test signal into a GP time window of a special time slot in a wireless frame structure, transmitting the self-test signal by utilizing a protection period of the special time slot in the wireless frame structure, and coupling the self-test signal into a receiving channel at the output end of a filter, so that the self-detection of a downlink of a remote radio unit is carried out according to the coupled received signal. After the self-test signal passes through the complete downlink receiving channel, the downlink gain, the radio frequency adjacent channel interference and the error vector are periodically detected, so that the purpose of performing performance self-test on the downlink of the radio frequency remote unit is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a downlink self-detection method of a remote radio unit according to an embodiment of the present invention;
fig. 2 is a self-detection flow chart of a downlink of a remote radio unit according to an embodiment of the present invention;
fig. 3 is a flowchart of a downlink gain detection according to an embodiment of the present invention;
FIG. 4 is a flow chart of adjacent channel leakage ratio detection according to an embodiment of the present invention;
fig. 5 is a flowchart of error vector magnitude detection according to an embodiment of the present invention.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like, if any, are used solely for distinguishing the description and are not to be construed as indicating or implying relative importance.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the appearances of the element defined by the phrase "comprising one … …" do not exclude the presence of other identical elements in a process, method, article or apparatus that comprises the element.
In the description of the present application, it should be noted that, if the terms "upper," "lower," "inner," "outer," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or an azimuth or the positional relationship that the product of the application is commonly put in use, it is merely for convenience of describing the present application and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application.
In the description of the present application, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The various embodiments and features of the embodiments described below may be combined with one another without conflict.
Examples
Referring to fig. 1, fig. 1 is a flowchart of a method for downlink self-detection of a remote radio unit according to an embodiment of the present invention. The embodiment of the application provides a downlink self-detection method of a remote radio unit, which comprises the following steps:
s110: inserting a self-test signal prior to digital up-conversion of the downlink;
specifically, in the TDD (Time Division Duplexing, time division duplex) mode, the self-test signal is inserted into a GP (Guard Period) time window of a special slot in the radio frame structure, and the self-test signal with a length of 2 symbols is transmitted by using a Guard Period of the special slot in the radio frame structure.
The frame structure is defined in the wireless communication system. The frame structure includes 3 parts: uplink time slot, downlink time slot and special time slot. The special time slot is not a complete downlink time slot or an uplink time slot, but can be configured differently according to application scenarios.
S120: after traversing the downlink transmitting link, the self-test signal is coupled to the self-detection receiving channel at the output end of the filter;
specifically, the self-test signal sequentially passes through digital up-conversion, peak clipping, digital predistortion, a digital-to-analog converter, a power amplifier and a filter, so that after the complete downlink transmitting link is traversed, the self-test signal is coupled into a receiving channel at the output end of the filter, and thus the self-detection of the downlink of the remote radio unit is performed according to the coupled received signal.
S130: collecting a receiving signal of a self-detection receiving channel;
specifically, a receiving channel in the multiplexing remote radio unit receives a self-test signal, the self-test signal is subjected to digital down-conversion through an analog-to-digital converter in sequence, and the received signal is collected in a digital chip (FPGA or ASIC) and stored in the DDR.
The digital chip may be an FPGA or an ASIC, among others.
S140: and detecting the gain of the downlink of the remote radio unit, the adjacent channel interference and the error vector according to the received signal to obtain a detection result.
Specifically, the self-test signal is sent periodically, and indexes such as the gain, the radio frequency adjacent channel interference, the error vector and the like of the downlink are detected periodically according to the received signal in the DDR, so that the purpose of performing performance self-test on the downlink of the remote radio unit is achieved.
Referring to fig. 2, fig. 2 is a flow chart of a self-detection of a downlink of a remote radio unit according to an embodiment of the invention. Within the GP time window, the uplink is active in the self-detection mode. The self-test signal is coupled to the receiving channel through microstrip line at the output end of the filter after sequentially passing through digital up-conversion, peak clipping, digital predistortion, digital-to-analog converter, balun, BPF, power amplifier and filter. Meanwhile, an on-board power divider is utilized to combine each two channels, and the coupling signals received by the multiple channels are converged on one receiving channel. At this time, the single-pole double-throw switch is switched to a self-test signal receiving channel, and the received signals are sequentially sent to the DDR through the Balun, the ADC and the digital down-conversion so as to carry out periodic analysis, thereby realizing the purpose of self-checking the performance of the downlink of the remote radio unit. In other time windows, the self-test signal is transmitted from the transmit channel sequentially via digital up-conversion, peak clipping, digital predistortion, digital-to-analog converter, balun, BPF, power amplifier and filter.
Wherein, the function of the Balun is to increase the anti-interference capability of signals, and the function of the BPF is to pass only signals processed by the Balun.
In some implementations of this embodiment, after the self-test signal traverses the downlink transmit chain, the step of coupling into the self-test receive channel at the output of the filter includes:
after traversing the complete downlink transmitting link, the self-test signal is coupled to the self-test receiving channel through a microstrip line at the filter output end of any channel. The coupler is thus constituted by a microstrip line, coupling the signal into the receiving channel at the filter output.
For example, the self-test signal may be sent periodically and traverse all downstream channels, with only one downstream channel being detected at each time.
In some implementations of this embodiment, after the self-test signal traverses the complete downlink transmission link, the step of coupling the filter output end of any channel to the self-test receiving channel through the microstrip line includes:
a power divider is arranged between the filter output ends of two adjacent channels for combining. So that the coupled signals received by the multiple channels are converged on one receiving channel.
In some implementations of this embodiment, the step of inserting the self-test signal before digital up-conversion of the downlink includes:
in the radio frame structure of TDD, according to the TDD configuration, the self-test signal is inserted into the GP time window of a special slot in the radio frame structure.
For example, the self-test signal does not need to be placed in every radio frame, and may be placed according to actual needs according to a period T, in which the self-test signal acts on multiple channels in turn, i.e., the self-test signal acts on only one channel at a time.
In some implementations of this embodiment, after the self-test signal traverses the downlink transmit chain, the step of coupling into the self-test receive channel at the output of the filter includes:
the self-test signal sequentially passes through digital up-conversion, peak clipping, digital predistortion, a digital-to-analog converter, a power amplifier and a filter to traverse a complete downlink transmitting link;
the self-test signal is coupled to the receiving channel through a microstrip line via the output end of the filter, a single-pole double-throw switch is arranged between the receiving channel and the radio frequency front end and is used for switching between a self-detection mode and a conventional receiving mode, wherein the single-pole double-throw switch is controlled by a digital chip, is switched to the self-detection mode in a GP time window and is switched to the conventional receiving mode in other time windows;
in the GP time window, the self-test signals are input into the data acquisition module after analog-to-digital conversion and digital down-conversion in sequence.
Specifically, the uplink will operate in the self-detection mode during the GP time window. The self-test signal is coupled to the receiving channel through the microstrip line at the output end of the filter after digital up-conversion, peak clipping, digital predistortion, digital-to-analog converter, power amplifier and filter. The self-test signal is sent to the data acquisition module after analog-to-digital conversion and digital down-conversion.
Wherein the digital up-conversion serves to increase the signal sampling rate and obtain the desired performance of the received baseband signal by means of interpolation. The effect of peak clipping is to reduce the peak-to-average ratio of the signal. The digital predistortion has the function of improving the nonlinearity of the power amplifier, and the basic principle is that a predistortion signal is generated according to a feedback signal of a transmitting feedback channel and is superimposed on a forward input signal, so that the purpose of compensating the power amplifier distortion is achieved. The DAC, i.e. the digital-to-analog converter, functions to convert a digital signal into an analog signal. The function of the power amplifier is to amplify the signal to a desired power level. The filter functions to reduce the portion of the whole band other than the useful signal to a sufficiently low level. The on-board power divider is used for synthesizing and transmitting multiple signals. The ADC, i.e. the analog-to-digital converter, functions to convert an analog signal into a digital signal. The effect of digital down-conversion is to decimate the sampled signal to reduce the signal sampling rate and achieve the desired performance.
Referring to fig. 5, fig. 5 is a flowchart of error vector magnitude detection according to an embodiment of the present invention. In some implementations of this embodiment, the step of detecting an error vector of a downlink of the remote radio unit according to the received signal to obtain a detection result includes:
using the formula
Calculating a vector error between a self-test signal to be transmitted and a received self-test signal, wherein k is a kth sampling point, X (k) is the self-test signal to be transmitted, Y (k) is the received self-test signal, and N is the number of signal sampling points;
the vector error is compared with a third preset threshold to detect the signal amplitude and phase effects of the entire downlink.
Specifically, if the vector error is greater than a third preset threshold, a link amplitude error abnormal warning is performed, otherwise, if the vector error is less than the third preset threshold, the next detection period is entered.
Referring to fig. 3, fig. 3 is a flowchart illustrating a downlink gain detection according to an embodiment of the present invention. In some implementations of this embodiment, the step of detecting a gain of a downlink of the remote radio unit according to the received signal to obtain a detection result includes:
calculating the average power of the self-test signal to be transmitted and the average power of the received self-test signal by a digital power meter based on one symbol period;
subtracting the average power of the self-test signal to be transmitted from the average power of the received self-test signal through a comparator, and taking an absolute value;
if the absolute value is larger than the first preset threshold, a link gain abnormality alarm is sent out, and if the absolute value is smaller than the first preset threshold, the next detection period is entered. Thereby realizing the purpose of detecting the downlink gain.
Referring to fig. 4, fig. 4 is a flowchart of an adjacent channel leakage ratio detection according to an embodiment of the present invention. In some implementations of the present embodiment, the step of detecting, according to the received signal, the radio adjacent channel interference of the downlink of the remote radio unit, and obtaining a detection result includes:
after carrying out frequency domain analysis on the received signal, calculating the average power of the signal in the whole sampling bandwidth, wherein the whole sampling bandwidth does not comprise carrier bandwidth;
and comparing the average power of the signal with a second preset threshold to judge whether the digital predistortion function in the downlink is in a normal working state. Specifically, if the average power of the signal is larger than a second preset threshold, a link digital predistortion abnormal alarm is sent out, and if the average power of the signal is smaller than the second preset threshold, the next detection period is entered.
Specifically, firstly, carrying out frequency domain processing on a received signal through a band elimination filter to filter out useful signals in a sampling bandwidth, then calculating the average power of the signals in the whole sampling bandwidth by utilizing a digital domain power meter, finally recording the link digital predistortion condition, if the average power of the signals is larger than a second preset threshold, sending out link digital predistortion abnormal alarm, and if the average power of the signals is smaller than the second preset threshold, entering the next detection period.
In some implementations of this embodiment, the self-test signal has a length of two symbol lengths, and the self-test signal is identical in two symbol lengths. Therefore, a certain fault tolerance capability is provided, and the requirement for time synchronization when receiving the self-test signal can be effectively reduced.
In some implementations of this embodiment, the step of collecting the received signal in the digital chip includes:
data of two symbol lengths are collected.
Specifically, the processing time delay of the whole remote radio unit is basically stable, so that the expected signal can be accurately acquired. And because the two symbol data of the self-test signal are completely consistent, a certain fault tolerance capability is provided, and the digital chip is further ensured to be capable of acquiring the data with the complete symbol length.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners as well. The apparatus embodiments described above are merely illustrative, for example, flow diagrams and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present application may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single part.
The functions, if implemented in the form of software functional modules 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 application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (9)
1. The downlink self-detection method of the remote radio unit is characterized by comprising the following steps of:
inserting a self-test signal prior to digital up-conversion of the downlink;
after traversing the downlink transmitting link, the self-test signal is coupled to a self-detection receiving channel at the output end of the filter;
collecting a receiving signal of the self-detection receiving channel;
detecting the gain of the downlink of the remote radio unit, the interference of adjacent channels of the radio frequency and the error vector according to the received signal to obtain a detection result;
wherein after the self-test signal traverses the downlink transmission link, the step of coupling into the self-detection receiving channel at the output end of the filter comprises:
the self-test signal sequentially passes through digital up-conversion, peak clipping, digital predistortion, a digital-to-analog converter, a power amplifier and a filter so as to traverse a complete downlink transmitting link;
the self-test signal is coupled to a receiving channel through a microstrip line via the output end of the filter, a single-pole double-throw switch is arranged between the receiving channel and the radio frequency front end and is used for switching between a self-detection mode and a conventional receiving mode, wherein the single-pole double-throw switch is controlled by a digital chip, is switched to the self-detection mode in a GP time window and is switched to the conventional receiving mode in other time windows;
in the GP time window, the self-test signals are input into a data acquisition module after analog-to-digital conversion and digital down-conversion in sequence.
2. The remote radio unit downlink self-test method according to claim 1, wherein the step of coupling the self-test signal into the self-test receive path at the output of the filter after traversing the downlink transmit link comprises:
after traversing the complete downlink transmitting link, the self-test signal is coupled to the self-detection receiving channel through a microstrip line at the filter output end of any channel.
3. The method according to claim 2, wherein the step of coupling the self-test signal to the self-test receiving channel at the filter output of any channel via a microstrip line after traversing the complete downlink transmission link comprises:
a power divider is arranged between the filter output ends of two adjacent channels for combining.
4. The method of claim 1, wherein the step of inserting the self-test signal prior to digital up-conversion of the downlink comprises:
in the radio frame structure of TDD, according to the TDD configuration, the self-test signal is inserted into the GP time window of a special slot in the radio frame structure.
5. The method for self-detecting downlink of remote radio unit according to claim 1, wherein the step of detecting an error vector of the downlink of the remote radio unit according to the received signal, and obtaining a detection result comprises:
using the formula
Calculating a vector error between a self-test signal to be transmitted and a received self-test signal, wherein k is a kth sampling point, X (k) is the self-test signal to be transmitted, Y (k) is the received self-test signal, and N is the number of signal sampling points;
and comparing the vector error with a third preset threshold to detect the signal amplitude and phase influence of the whole downlink.
6. The method for self-detecting downlink of remote radio unit according to claim 1, wherein the step of detecting the gain of the downlink of the remote radio unit according to the received signal, and obtaining the detection result comprises:
calculating the average power of the self-test signal to be transmitted and the average power of the received self-test signal by a digital power meter based on one symbol period;
subtracting the average power of the self-test signal to be transmitted from the average power of the received self-test signal through a comparator, and taking an absolute value;
if the absolute value is larger than a first preset threshold, a link gain abnormity alarm is sent out, and if the absolute value is smaller than the first preset threshold, the next detection period is started.
7. The method for self-detecting downlink of remote radio unit according to claim 1, wherein the step of detecting adjacent channel interference of the downlink of the remote radio unit according to the received signal, and obtaining the detection result comprises:
after carrying out frequency domain analysis on the received signal, calculating the average power of the signal in the whole sampling bandwidth, wherein the whole sampling bandwidth does not comprise a carrier bandwidth;
and comparing the average power of the signal with a second preset threshold to judge whether the digital predistortion function in the downlink is in a normal working state.
8. The method of claim 1, wherein the self-test signal has a length of two symbols and the self-test signal is identical in two symbol lengths.
9. The remote radio unit downlink self-test method as claimed in claim 8, wherein the step of collecting the received signal of the self-test reception channel comprises:
data of two symbol lengths are collected.
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