CN113572542A - High-precision device and method for detecting standing-wave ratio of radio remote unit - Google Patents
High-precision device and method for detecting standing-wave ratio of radio remote unit Download PDFInfo
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Abstract
The invention provides a high-precision device and a method for detecting a standing-wave ratio of a radio remote unit, and relates to the technical field of communication. The invention relates to a high-precision standing-wave ratio detection device and a high-precision standing-wave ratio detection method for a radio remote unit, which comprise an eCPRI, a downlink frequency domain digital signal processing module, a downlink time domain digital signal processing module, a digital up-conversion Power Meter, a transmission feedback channel Power Meter, a scheduling RB total bandwidth statistic, a transmission processing module, a transmission feedback processing module and a standing-wave ratio calculation module; the high-precision standing-wave ratio detection device and method for the radio remote unit are suitable for outdoor and indoor standing-wave ratio detection of various radio units, cost is reduced, the standing-wave ratio detection precision can be remarkably improved, and the probability of false alarm or false alarm of standing-wave detection is favorably improved.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a high-precision device and a method for detecting a standing-wave ratio of a radio remote unit.
Background
In wireless communication, the RRU is a core network element of 2G, 3G, 4G, and 5G communication technologies, and is mainly responsible for converting digital signals into analog radio frequency signals and sending the analog radio frequency signals to a wireless environment; meanwhile, the wireless radio frequency signal can be received, and the received wireless radio frequency signal is converted into a digital signal. As the RRU is a device for transmitting wireless signal energy to the external environment, the RRU is required to provide a high-precision Standing Wave Ratio (VSWR) detection function to detect and track the state of the RRU transmitting wireless signals to the external environment in real time.
Currently, the mainstream standing-wave ratio detection scheme in the industry is to add a separate radio frequency signal coupler in a filter unit, and to implement accurate air interface standing-wave ratio detection through a dedicated radio frequency circuit and an ADC chip, but because additional circuits and chips are added, the cost is higher. Compared with the standing-wave ratio detection scheme with low cost, the standing-wave ratio detection scheme with low cost is characterized in that the detector and the ADC chip are used at the circulator to realize air interface standing-wave ratio detection, although the scheme is low in cost, in the prior art, particularly in a dynamic service scene, the forward signal and the reflected signal leaked at the circulator are subjected to phase superposition or phase cancellation, so that the problems that the standing-wave ratio detection result has a large fluctuation range, the detector detection time cannot be accurately fixed, the detector detection voltage range is limited, the standing-wave ratio detection dynamic range is small and the like exist.
Disclosure of Invention
The invention aims to provide a high-precision standing-wave ratio detection device and method for a radio remote unit, which can be suitable for outdoor and indoor standing-wave ratio detection of various radio units, reduce the cost and obviously improve the detection precision of the standing-wave ratio, thereby being beneficial to improving the probability of false alarm or false alarm of standing-wave detection.
The embodiment of the invention is realized by the following steps:
in a first aspect, an embodiment of the present application provides a high-precision standing-wave ratio detection device for a radio remote unit, which includes an eccri, a downlink frequency domain digital signal processing module, a downlink time domain digital signal processing module, a digital up-conversion Power Meter, a transmission feedback channel Power Meter, a scheduling RB total bandwidth statistic module, a transmission processing module, a transmission feedback processing module, and a standing-wave ratio calculation module; the eCPRI is connected to the downlink frequency domain digital signal processing module, the downlink time domain digital signal processing module is respectively connected to the transmission processing module and the transmission feedback processing module, the transmission processing module is connected to the transmission feedback processing module, and the standing-wave ratio calculating module is respectively connected to the digital up-conversion Power Meter, the transmission feedback channel Power Meter and the total bandwidth statistics of the scheduling RB.
The eCPRI is used for transmitting the modulated frequency domain data packet to the radio remote unit by the baseband; the downlink frequency domain digital signal processing module is used for analyzing the data packet transmitted by the eCPRI and mapping the data according to a specified format, so as to prepare for the subsequent digital signal processing module and obtain the statistical result of the total bandwidth of the scheduling RB; the downlink time domain digital signal processing module is used for converting the frequency domain digital signal into a time domain signal, carrying out certain processing on the converted signal and calculating the power at the digital up-conversion module; the digital up-conversion Power Meter and the Power Meter of the sending feedback channel are used for counting and calculating the average Power of a digital domain in a period of time; and the standing-wave ratio calculation module is used for judging and calculating the standing-wave ratio at the measuring moment according to the input statistical result of the total bandwidth of the scheduling RB, the digital up-conversion Power Meter result and the transmission feedback channel Power Meter result.
In some embodiments of the present invention, the transmit processing module includes a DAC, a transmit channel analog up-conversion module, a power amplifier, and a circulator; the sending feedback processing module comprises a high-power switch, a single-pole double-throw switch, a sending feedback channel analog down-conversion module and an ADC; the down time domain digital signal processing module is respectively connected with the DAC and the ADC, the DAC is connected with the sending channel analog up-conversion module, a power amplifier is arranged between the sending channel analog up-conversion module and the circulator, the single-pole double-throw switch is connected with the power amplifier through a coupler, the circulator is connected between the power amplifier and one end of the high-power switch, the other end of the high-power switch is connected with one end of the single-pole double-throw switch through an attenuator and is provided with an up receiving channel, the other end of the single-pole double-throw switch is connected with the sending feedback channel analog down-conversion module, and the sending feedback channel analog down-conversion module is connected with the ADC.
The DAC is used for converting a digital signal into an analog signal; the sending channel analog up-conversion module is used for converting the analog signal to a high-frequency point required by the system; the power amplifier is used for amplifying the low-power analog signal to a level corresponding to a rated power level of a system; the circulator is used for isolating the receiving signal and the sending signal; the high-power switch is used for switching the circuit, specifically, at the downlink time, the switch is switched to the standing-wave ratio detection link direction, and at the uplink time, the switch is switched to the uplink receiving channel direction in an open loop manner; at the time of measuring the standing-wave ratio, the single-pole double-throw switch is switched to the direction of the standing-wave ratio detection link, and at other times, the switch is switched to the direction of the transmission feedback channel; the sending feedback channel analog down-conversion module is used for converting the received analog signal to a required low-frequency point; the ADC is used to convert an analog signal to a digital signal.
In some embodiments of the present invention, the circulator is coupled to a filter, and the filter is coupled to an antenna.
The output end of the filter is connected with the antenna, the filter is used for suppressing out-of-band frequency components, interference and noise, and the antenna is used for transmitting wireless signals to the outside.
In some embodiments of the present invention, an output end of the standing-wave ratio calculating module is connected to an alarm module.
And the alarm module is used for determining whether to generate standing wave alarm according to the standing wave ratio obtained by calculation.
In some embodiments of the present invention, the downlink frequency domain digital signal processing module includes an eccri deframing module and a frequency domain data mapping module, and the eccri deframing module is connected to the frequency domain data mapping module.
The eCPRI de-framing module is used for analyzing a data packet transmitted by a baseband through an eCPRI protocol and extracting useful frequency domain data needing to be processed; and the frequency domain data mapping module is used for mapping the extracted frequency domain data to corresponding time frequency resource blocks according to the requirements of a 3GPP protocol, counting the number of the mapped time frequency resource blocks to obtain the number of the scheduling RBs, and further calculating to obtain the total bandwidth counting result of the scheduling RBs.
In some embodiments of the present invention, the downlink time domain digital signal processing module includes a time frequency conversion module, a digital up-conversion module, a crest factor elimination module, and a digital pre-distortion module, the time frequency conversion module is connected to the digital up-conversion module, the digital up-conversion module is respectively connected to the crest factor elimination module and the digital up-conversion Power Meter, and the crest factor elimination module is connected to the digital pre-distortion module.
The time-frequency conversion module is used for converting the frequency domain data mapped by the frequency domain data mapping module into time domain data; the digital up-conversion module is used for moving the time domain digital signal of zero frequency to a required frequency point through digital mixing, filtering and then counting the average Power of the time domain data after filtering through a digital up-conversion Power Meter connected with the digital up-conversion module; the crest factor eliminating module is used for reducing the crest-to-average ratio of the time domain signal so as to ensure that the signal does not exceed the dynamic range of the power amplifier, and further reducing the nonlinear distortion of the signal; the digital predistortion module is used for improving the nonlinearity of the power amplifier, and specifically, a predistortion signal is generated according to a feedback signal of a transmission feedback channel and is superposed on a forward input signal, so that the purpose of compensating the power amplifier distortion is achieved.
In a second aspect, an embodiment of the present application provides a high-precision method for detecting a standing-wave ratio of a remote radio unit, including the following steps:
step S1, starting RRU, enabling the standing-wave ratio detection function by software and setting the standing-wave ratio detection period and the bandwidth threshold;
step S2, configuring a digital up-conversion module and a Power Meter for sending a feedback channel, wherein the counting start time of the two Power Meters is consistent with the length of a measurement sample, and the length of the measurement sample is the number of sampling points contained in 1 TTI time;
step S3, determining whether the standing-wave ratio detection period has arrived, if yes, performing step S4, if no, continuing to wait for the arrival of the standing-wave ratio detection period;
step S4, obtaining the total bandwidth of the scheduling RB in the TTI corresponding to the counting start time;
step S5, determining whether the counted total bandwidth of the scheduling RB is greater than the set bandwidth threshold, if so, performing step S6, otherwise, returning to step S3;
step S6, counting and calculating the Power Meter of the digital up-conversion module and the Power Meter of the sending feedback channel and obtaining the calculation result;
and step S7, calculating by using a standing-wave ratio calculation formula according to the calculation result to obtain the standing-wave ratio.
In some embodiments of the present invention, the step S2 includes two modes: if the frequency division multiplexing mode is adopted, the counting starting time can be configured randomly; if the time division multiplexing mode is adopted, the counting start time needs to be configured to the start time point of any downlink time slot according to the proportion of time division multiplexing.
In some embodiments of the present invention, the specific formula for obtaining the total bandwidth of the scheduling RBs in step S4 is as follows: scheduling RB total bandwidth 12 scheduling RB number of RBs subcarrier spacing.
In some embodiments of the present invention, the standing-wave ratio calculation formula in step S7 is specifically:
ReturnLoss(dB)＝Pforward(dBFS)-Preversed(dBFS) in which
The digital domain Power, P, calculated by the Power Meter of the digital up-conversion modulereversed(dBFS) represents the digital domain Power calculated by the Power Meter of the above-mentioned transmission feedback channel.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:
the invention provides a high-precision device and a method for detecting standing-wave ratio of a radio remote unit, comprising the following steps: frequency domain scheduling RB bandwidth detection, wherein the advantage of real-time scheduling RB bandwidth can be obtained by counting a radio remote unit RRU adopting an eCPRI protocol, and the total bandwidth statistics of real-time scheduling RB is added as a prerequisite condition for judging whether standing-wave ratio detection is effective or not; calculating in real time by using a Power Meter at the digital up-conversion module to obtain a minimum scheduling unit, namely average Power in 1 TTI, which is used as forward Power for standing-wave ratio detection; on the premise of not adding an extra ADC chip, ADC time division multiplexing of a reverse power channel and a sending feedback channel is realized by using a single-band double-throw switch, and reverse power corresponding to a forward power measurement moment is obtained by using a PowerMeter of the sending feedback channel for real-time calculation; and finally, comprehensively evaluating and calculating the standing-wave ratio at the measuring moment according to the input total bandwidth of the scheduling RB, the forward average power and the reverse average power. The invention is suitable for standing wave ratio detection of various outdoor and indoor radio frequency units, and can remarkably improve the standing wave ratio detection precision while reducing the cost, thereby being beneficial to improving the probability of false alarm or false alarm of standing wave detection.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a block diagram of a high-precision remote radio unit standing-wave ratio detection apparatus according to an embodiment of the present application;
fig. 2 is a schematic block diagram of a high-precision remote radio unit standing-wave ratio detection apparatus according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a downlink frequency domain digital signal processing module and a downlink time domain digital signal processing module of a high-precision remote radio unit standing-wave ratio detection apparatus according to an embodiment of the present invention;
fig. 4 is a flowchart of a high-precision method for detecting a standing-wave ratio of a remote radio unit according to an embodiment of the present invention;
fig. 5 is an effect diagram of a high-precision remote radio unit standing-wave ratio detection method according to an embodiment of the present invention.
Detailed Description
Terms and nouns explain:
remote Radio Unit (Remote Radio Unit): the Remote Radio Unit is divided into a near-end machine, namely a Radio base band control (RS), and a Remote machine, namely a Remote Radio Unit (RRU), which are connected through an optical fiber, wherein the interface is based on an open CPRI or IR interface and can be stably connected with equipment of a main flow manufacturer; the RS can be installed in a proper machine room position, and the RRUs are installed at the antenna end, so that a part of the former base station module is separated, and by separating the RS from the RRUs, the complicated maintenance work can be simplified to the RS end, and one RS can be connected with a plurality of RRUs, thereby saving the space, reducing the setting cost and improving the networking efficiency; meanwhile, the interface for connecting the two is made of optical fiber, so that the loss is low.
Standing Wave Ratio (Voltage stabilizing Wave Ratio): the standing wave ratio is called voltage standing wave ratio, also called VSWR and SWR, and is English abbreviation, referring to the ratio of the voltage of the antinode of the standing wave to the voltage of the valley, also called standing wave coefficient and standing wave ratio; when the standing-wave ratio is equal to 1, the impedance of the feeder line and the antenna is completely matched, and at the moment, high-frequency energy is radiated by the antenna completely without energy reflection loss; when the standing-wave ratio is infinite, the total reflection is shown, and the energy is not radiated at all.
eCPRI (enhanced Common Public Radio interface): an enhanced general public radio interface.
Tti (transmission Time interval): a transmission time interval.
Power Meter: and a power meter.
DAC (digital to Analog converter): and D/A conversion for converting the digital signal into analog signal.
Adc (analog to Digital converter): and the analog-to-digital conversion is used for converting the analog signal into a digital signal.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in 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 obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, e.g. as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the individual features of the embodiments can be combined with one another without conflict.
Example 1
Referring to fig. 1 and fig. 2, fig. 1 is a block diagram of a high-precision remote radio unit standing-wave ratio detection apparatus according to an embodiment of the present disclosure, and fig. 2 is a block diagram of a high-precision remote radio unit standing-wave ratio detection apparatus according to an embodiment of the present disclosure.
The embodiment of the application provides a high-precision standing-wave ratio detection device for a radio remote unit, which comprises an eCPRI, a downlink frequency domain digital signal processing module, a downlink time domain digital signal processing module, a digital up-conversion Power Meter, a transmission feedback channel Power Meter, a scheduling RB total bandwidth statistic module, a transmission processing module, a transmission feedback processing module and a standing-wave ratio calculation module.
The eCPRI is connected with a downlink frequency domain digital signal processing module, the downlink time domain digital signal processing module is respectively connected with a sending processing module and a sending feedback processing module, the sending processing module is connected with the sending feedback processing module, and a standing-wave ratio calculating module is respectively connected with a scheduling RB total bandwidth statistic, a digital up-conversion Power Meter and a sending feedback channel Power Meter.
Specifically, the sending processing module comprises a DAC, a sending channel analog up-conversion module, a power amplifier and a circulator; the sending feedback processing module comprises a high-power switch, a single-pole double-throw switch, a sending feedback channel analog down-conversion module and an ADC.
The system comprises a down time domain digital signal processing module, a DAC (digital-to-analog converter) module, a transmitting channel analog up-conversion module, a Power amplifier, a circulator port 1, a circulator port 3, a high-Power switch, an attenuator, a single-pole double-throw switch, an up receiving channel, a feedback channel analog down-conversion module, a coupler, a feedback channel analog down-conversion module, a transmitting feedback channel analog down-conversion module, a RB total bandwidth statistical result, a digital up-conversion Power Meter result and a feedback channel Power Meter result, wherein the down time domain digital signal processing module is respectively connected with the DAC and the ADC, the DAC is connected with the transmitting channel analog up-conversion module, the transmitting channel analog up-conversion module is connected with the Power amplifier, one end of the high-Power switch is connected with the single-pole double-throw switch through the attenuator, the other end of the single-pole double-throw switch is provided with an up-conversion receiving channel, one end of the single-pole double-throw switch is connected with the feedback channel analog down-conversion module, and the other end of the transmitting feedback channel analog down-conversion module is connected with the standing-wave ratio computing module.
The eCPRI is used for transmitting the modulated frequency domain data packet to the radio remote unit by the baseband; the downlink frequency domain digital signal processing module is used for analyzing the data packet transmitted by the eCPRI and mapping the data according to a specified format to prepare for the following digital signal processing module and simultaneously output and schedule the total bandwidth of the RB; the downlink time domain digital signal processing module is used for converting the frequency domain digital signal into a time domain signal, carrying out certain processing on the converted signal and calculating the power at the digital up-conversion module; the DAC is used for converting the digital signal into an analog signal; the sending channel analog up-conversion module is used for converting the analog signal to a high-frequency point required by the system; the power amplifier is used for amplifying the low-power analog signal to a level corresponding to a rated power level of a system; the circulator is used for isolating the receiving signal and the sending signal; the high-power switch is used for switching the circuit, specifically, at the downlink time, the switch is switched to the standing-wave ratio detection link direction, and at the uplink time, the switch is switched to the uplink receiving channel direction in an open loop manner; at the time of measuring the standing-wave ratio, the single-pole double-throw switch is switched to the direction of the standing-wave ratio detection link, and at other times, the switch is switched to the direction of the transmission feedback channel; the sending feedback channel analog down-conversion module is used for converting the received analog signal to a required low-frequency point; the ADC is used for converting the analog signal into a digital signal; the digital up-conversion Power Meter and the Power Meter of the sending feedback channel are both used for counting and calculating the average Power of a digital domain within a period of time; and the standing-wave ratio calculation module is used for judging and calculating the standing-wave ratio at the measuring moment according to the input statistical result of the total bandwidth of the scheduling RB, the digital up-conversion Power Meter result and the transmission feedback channel Power Meter result.
The high-precision remote radio unit standing-wave ratio detection device provided by the embodiment of the invention cancels a detector and a single ADC chip required by the traditional reverse power measurement, and adopts a single-pole double-throw switch to realize time division multiplexing ADC with a transmission feedback channel to measure the reverse power.
Specifically, the total bandwidth of the scheduled RB at the standing-wave ratio measurement time is counted in real time through a module which is responsible for processing frequency domain data through the RRU, the result is input to a standing-wave ratio calculation module, the standing-wave ratio detection result is considered to be effective only when the total bandwidth of the scheduled RB is larger than a set threshold, and the problem that the fluctuation range of the standing-wave ratio detection result is large due to phase superposition or phase cancellation of a forward signal and a reflected signal which are leaked at a port 3 of the circulator in the traditional scheme can be effectively solved; a Power Meter is added at an RRU time domain data processing digital up-conversion module, average Power calculation is realized by an FPGA or an ASIC, specific measurement time and measurement sample length can be flexibly configured, and accurate measurement of forward Power is realized on the premise of not increasing hardware cost; at the standing-wave ratio detection time, a single-pole double-throw switch on a sending feedback channel is switched to a reverse Power transmission channel, an ADC (analog-to-digital converter) of the sending feedback channel is utilized to convert a reverse analog signal into a digital signal, meanwhile, a Power Meter is added in the sending feedback channel, reverse average Power calculation is realized by an FPGA (field programmable gate array) or an ASIC (application specific integrated circuit), and the measurement time and the measurement sample length of the Power Meter at the position are consistent with those of the Power Meter at a digital up-conversion module, so that the problem that a detector cannot accurately control reverse Power detection time under the traditional scheme is solved, and the detection accuracy is improved; the reverse Power calculation replaces the traditional detector detection by the digital domain Power Meter with higher precision and larger dynamic range, thereby not only solving the problem of low standing-wave ratio detection dynamic range caused by the limited detection voltage range of the detector, but also reducing the cost.
In a preferred embodiment, a filter is connected to the circulator port 2, and an antenna is connected to the filter.
The filter is used for suppressing out-of-band frequency components, interference and noise; the antenna is used for transmitting wireless signals to the outside.
As a preferred implementation mode, the output end of the standing-wave ratio calculation module is connected with an alarm module.
And the alarm module is used for determining whether to generate standing wave alarm according to the standing wave ratio obtained by calculation.
It will be appreciated that the configuration shown in fig. 1 is merely illustrative and that the present embodiment may include more or fewer components than shown in fig. 1 or have a different configuration than shown in fig. 1. The components shown in fig. 1 may be implemented in hardware, software, or a combination thereof.
Example 2
Referring to fig. 3, fig. 3 is a schematic diagram of a downlink frequency domain digital signal processing module and a downlink time domain digital signal processing module of a high-precision remote radio unit standing-wave ratio detection apparatus according to an embodiment of the present invention.
As a preferred embodiment, the downlink frequency domain digital signal processing module includes an eccri deframing module and a frequency domain data mapping module, and the eccri deframing module is connected to the frequency domain data mapping module.
The eCPRI de-framing module is used for analyzing a data packet transmitted by a baseband through an eCPRI protocol and extracting useful frequency domain data needing to be processed; and the frequency domain data mapping module is used for mapping the extracted frequency domain data to corresponding time frequency resource blocks according to the requirements of a 3GPP protocol, counting the number of the mapped time frequency resource blocks to obtain the number of the scheduling RBs, and further calculating to obtain the total bandwidth counting result of the scheduling RBs.
As a preferred embodiment, the downlink time domain digital signal processing module includes a time-frequency conversion module, a digital up-conversion module, a crest factor elimination module, and a digital predistortion module, the time-frequency conversion module is connected to the digital up-conversion module, the digital up-conversion module is respectively connected to the crest factor elimination module and the digital up-conversion Power Meter, and the crest factor elimination module is connected to the digital predistortion module.
The time-frequency conversion module is used for converting the frequency domain data mapped by the frequency domain data mapping module into time domain data; the digital up-conversion module is used for moving the time domain digital signal of zero frequency to a required frequency point through digital mixing, filtering and then counting the average Power of the time domain data after filtering through a digital up-conversion Power Meter connected with the digital up-conversion module; the crest factor eliminating module is used for reducing the crest-to-average ratio of the time domain signal so as to ensure that the signal does not exceed the dynamic range of the power amplifier, and further reducing the nonlinear distortion of the signal; the digital predistortion module is used for improving the nonlinearity of the power amplifier, and specifically, a predistortion signal is generated according to a feedback signal of a transmission feedback channel and is superposed on a forward input signal, so that the purpose of compensating the power amplifier distortion is achieved.
Example 3
Referring to fig. 4, fig. 4 is a flowchart illustrating a high-precision remote radio unit standing-wave ratio detection method according to an embodiment of the present invention.
The embodiment of the application provides a high-precision method for detecting standing-wave ratio of a remote radio unit, which comprises the following steps:
step S1, starting RRU, enabling the standing-wave ratio detection function by software and setting the standing-wave ratio detection period and the bandwidth threshold;
step S2, configuring a digital up-conversion module and a Power Meter for sending a feedback channel, wherein the counting start time of the two Power Meters is consistent with the length of a measurement sample, and the length of the measurement sample is the number of sampling points contained in 1 TTI time;
step S3, judging whether the set standing-wave ratio detection period arrives, if yes, executing step S4, if no, continuing waiting for the standing-wave ratio detection period to arrive;
step S4, obtaining the total bandwidth of the scheduling RB in the TTI corresponding to the counting start time;
step S5, judging whether the counted total bandwidth of the scheduling RB is larger than a set bandwidth threshold, if so, performing step S6, and if not, returning to step S3;
step S6, counting and calculating the Power Meter of the digital up-conversion module and the Power Meter of the sending feedback channel and obtaining the calculation result;
and step S7, calculating by using a standing-wave ratio calculation formula according to the calculation result to obtain the standing-wave ratio.
The high-precision standing-wave ratio detection method for the radio remote unit mainly utilizes the statistical result of the total bandwidth of the real-time scheduling RB and the digital domain average power to calculate the standing-wave ratio, wherein the digital domain average power has the advantages of higher precision and controllable statistical time.
As a preferred embodiment, step S2 includes two modes: if the frequency division multiplexing mode is adopted, the counting starting time can be configured randomly; if the time division multiplexing mode is adopted, the counting starting time needs to be configured to the starting time point of any downlink time slot according to the proportion of the time division multiplexing.
As a preferred embodiment, the specific formula for acquiring the total bandwidth of the scheduling RBs in step S4 is as follows: scheduling RB total bandwidth 12 scheduling RB number of RBs subcarrier spacing.
As a preferred embodiment, the standing-wave ratio calculation formula in step S7 is specifically:
ReturnLoss(dB)＝Pforward(dBFS)-Preversed(dBFS) in which
Represents the digital domain Power, P, calculated by the Power Meter of the digital Up-conversion Modulereversed(dBFS) represents the digital domain Power calculated by the Power Meter that sent the feedback channel.
Example 4
Referring to fig. 5, fig. 5 is a diagram illustrating an effect of a high-precision remote radio unit standing-wave ratio detection method according to an embodiment of the present invention.
The effect diagram shown in fig. 5 includes a measurement error result calculated by a standing-wave ratio calculation formula according to the high-precision standing-wave ratio detection method for the remote radio unit according to the embodiment of the present invention and a standing-wave ratio measurement error result in the conventional scheme.
Wherein, the horizontal direction represents the standing-wave ratio actually set, and the vertical direction represents the standing-wave ratio obtained by measurement.
The solid line part is the standing-wave ratio measurement result of the scheme of the invention. Specifically, the solid line where the hollow circle in the solid line part is located represents the actual value wiring of the standing-wave ratio in the scheme of the invention; the solid line where the solid circle is located in the solid line part represents the maximum wiring of the standing-wave ratio in the scheme of the invention; the solid line of the square in the solid line part represents the minimum value wiring of the standing-wave ratio of the scheme of the invention.
In the dotted line part are standing wave ratio measurements of the conventional scheme. Specifically, the dotted line where the solid circle in the dotted line part is located represents the maximum value routing of the standing-wave ratio in the conventional scheme; the dotted line where the square is located in the dotted line part represents the minimum value trace of the standing-wave ratio in the conventional scheme.
According to the embodiment of the invention, the comparison between the detection result effect diagram of the high-precision standing-wave ratio detection method of the remote radio unit and the detection result effect diagram of the standing-wave ratio in the traditional scheme is not difficult to find, so that the standing-wave ratio detection precision is obviously improved, and the probability of false alarm or false alarm of standing-wave detection is favorably improved.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart 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, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent 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 or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In summary, the high-precision rf remote unit standing-wave ratio detection apparatus and method provided in the embodiments of the present application eliminate a detector and a separate ADC chip required for traditional reverse power measurement in hardware circuit design, and instead use a single-pole double-throw switch to implement time division multiplexing ADC with a transmission feedback channel to measure reverse power; the method comprises the steps that a module, which is responsible for processing frequency domain data, of the RRU is used for counting the total bandwidth of a scheduling RB at the time of standing-wave ratio measurement in real time, the result of the counting is input into a standing-wave ratio calculation module, and the standing-wave ratio detection result is considered to be effective only when the total bandwidth of the scheduling RB is larger than a set threshold; a Power Meter is added at an RRU time domain data processing digital up-conversion module, average Power calculation is realized by an FPGA or an ASIC, specific measurement time and measurement sample length can be flexibly configured, and accurate measurement of forward Power is realized; at the standing-wave ratio detection time, a single-pole double-throw switch on a sending feedback channel is switched to a reverse Power transmission channel, an ADC (analog-to-digital converter) of the sending feedback channel is used for converting a reverse analog signal into a digital signal, meanwhile, a Power Meter is added in the sending feedback channel, reverse average Power calculation is realized by an FPGA (field programmable gate array) or an ASIC (application specific integrated circuit), the measurement time and the measurement sample length of the Power Meter at the position are consistent with those of a Power Meter at a digital up-conversion module, the reverse Power detection time is accurately controlled, and the detection precision is improved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall 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 attributes 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 (10)
1. A high-precision standing-wave ratio detection device of a radio remote unit is characterized by comprising an eCPRI, a downlink frequency domain digital signal processing module, a downlink time domain digital signal processing module, a digital up-conversion Power Meter, a transmission feedback channel Power Meter, a scheduling RB total bandwidth statistic, a transmission processing module, a transmission feedback processing module and a standing-wave ratio calculation module; the eCPRI is connected with the downlink frequency domain digital signal processing module, the downlink time domain digital signal processing module is respectively connected with the sending processing module and the sending feedback processing module, the sending processing module is connected with the sending feedback processing module, and the standing-wave ratio calculating module is respectively connected with the digital up-conversion Power Meter, the sending feedback channel Power Meter and the total bandwidth statistics of the scheduling RB.
2. The high accuracy remote radio unit standing-wave ratio detecting device of claim 1, wherein the transmit processing module comprises a DAC, a transmit channel analog up-conversion module, a power amplifier and a circulator; the sending feedback processing module comprises a high-power switch, a single-pole double-throw switch, a sending feedback channel analog down-conversion module and an ADC; the down time domain digital signal processing module is respectively connected with the DAC and the ADC, the DAC is connected with the sending channel analog up-conversion module, a power amplifier is arranged between the sending channel analog up-conversion module and the circulator, the single-pole double-throw switch is connected with the power amplifier through a coupler, the circulator is connected between the power amplifier and one end of the high-power switch, the other end of the high-power switch is connected with one end of the single-pole double-throw switch through an attenuator and is provided with an up receiving channel, the other end of the single-pole double-throw switch is connected with the sending feedback channel analog down-conversion module, and the sending feedback channel analog down-conversion module is connected with the ADC.
3. The apparatus as claimed in claim 2, wherein the circulator is connected to a filter, and the filter is connected to an antenna.
4. The high accuracy remote radio unit standing-wave ratio detection device as claimed in claim 1, wherein said standing-wave ratio calculation module is connected to an alarm module.
5. The apparatus as claimed in claim 1, wherein the downlink frequency-domain dsp module comprises an eccri de-framing module and a frequency-domain data mapping module, and the eccri de-framing module is connected to the frequency-domain data mapping module.
6. The apparatus as claimed in claim 1, wherein the downlink time-domain digital signal processing module comprises a time-frequency conversion module, a digital up-conversion module, a crest factor elimination module, and a digital pre-distortion module, the time-frequency conversion module is connected to the digital up-conversion module, the digital up-conversion module is connected to the crest factor elimination module and the digital up-conversion Power Meter, respectively, and the crest factor elimination module is connected to the digital pre-distortion module.
7. A high-precision standing-wave ratio detection method for a remote radio unit is characterized by comprising the following steps:
step S1, starting RRU, enabling the standing-wave ratio detection function by software and setting the standing-wave ratio detection period and the bandwidth threshold;
step S2, configuring a digital up-conversion module and a Power Meter for sending a feedback channel, wherein the counting start time of the two Power Meters is consistent with the length of a measurement sample, and the length of the measurement sample is the number of sampling points contained in 1 TTI time;
step S3, judging whether the standing-wave ratio detection period is reached, if yes, executing step S4, if not, continuing waiting for the standing-wave ratio detection period to be reached;
step S4, obtaining the total bandwidth of the scheduling RB in the TTI corresponding to the counting start time;
step S5, judging whether the counted total bandwidth of the scheduling RB is larger than the set bandwidth threshold, if so, performing step S6, and if not, returning to step S3;
step S6, counting and calculating the Power Meter of the digital up-conversion module and the Power Meter of the sending feedback channel and obtaining the calculation result;
and step S7, calculating by using a standing-wave ratio calculation formula according to the calculation result to obtain the standing-wave ratio.
8. The method as claimed in claim 7, wherein the step S2 includes two modes: if the frequency division multiplexing mode is adopted, the counting starting time can be configured at will; if the time division multiplexing mode is adopted, the counting starting time needs to be configured to the starting time point of any downlink time slot according to the proportion of time division multiplexing.
9. The method as claimed in claim 7, wherein the specific formula for obtaining the total bandwidth of the scheduled RBs in step S4 is as follows: scheduling RB total bandwidth 12 scheduling RB number of RBs subcarrier spacing.
10. The method for detecting the standing-wave ratio of a high-precision remote radio unit according to claim 7, wherein the standing-wave ratio calculation formula in step S7 is specifically as follows:
ReturnLoss(dB)＝Pforward(dBFS)-Preversed(dBFS) in which
Represents the digital domain Power, P, calculated by the Power Meter of the digital up-conversion modulereversed(dBFS) represents the digital domain Power calculated by the Power Meter of the sending feedback channel.
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