CN110212997B - Method and device for acquiring modulation error rate - Google Patents
Method and device for acquiring modulation error rate Download PDFInfo
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- CN110212997B CN110212997B CN201910485340.0A CN201910485340A CN110212997B CN 110212997 B CN110212997 B CN 110212997B CN 201910485340 A CN201910485340 A CN 201910485340A CN 110212997 B CN110212997 B CN 110212997B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
Abstract
The embodiment of the application provides a method for obtaining a modulation error rate, which relates to the technical field of communication and comprises the following steps: receiving the transmission signal through a receiving channel of a predistorter; preprocessing the transmission signal to obtain calculation data for calculation; acquiring theoretical data corresponding to the transmission signals, determining the theoretical data as sending data, and determining the calculation data as receiving data; and calculating according to the sending data, the receiving data and a preset calculation formula to obtain a Modulation Error Rate (MER). By implementing the embodiment, the monitoring cost of the MER can be reduced, and the requirement on the algorithm can be reduced.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for obtaining a modulation error rate.
Background
Therefore, in the prior art center, it is usually necessary to monitor the MER value in the wireless base station in real time so that the wireless base station can adjust the operating states of the exciter and the transmitter in real time according to the MER value.
However, in practice, it is found that currently, the monitoring of the MER is usually performed by using a dedicated instrument, and one dedicated instrument needs to be equipped in each transmitter, thereby resulting in high monitoring cost of the MER; on the other hand, the MER monitoring can also use a TUNER to assist in monitoring, but the method also needs to read the demodulated constellation value through software and then calculate according to a formula, and thus, the MER monitoring mode needs to add extra hardware, which increases the cost, and meanwhile, the MER monitoring mode has higher requirements on the algorithm.
Disclosure of Invention
An object of the embodiments of the present application is to provide a method and an apparatus for obtaining a modulation error rate, which can reduce monitoring cost of MER and can reduce requirements for an algorithm.
The embodiment of the application provides a method for acquiring a modulation error rate, which comprises the following steps:
receiving a transmission signal by a predistorter;
preprocessing the transmission signal to obtain calculation data for calculation;
acquiring theoretical data corresponding to the transmission signals, determining the theoretical data as sending data, and determining the calculation data as receiving data;
and calculating according to the sending data, the receiving data and a preset calculation formula to obtain the modulation error rate.
In the implementation process, the transmission signal may be received by a predistorter in advance, in this step, the predistorter may be a part of the obtaining apparatus for modulating the bit error rate, or may be an external predistorter, so that the cost may be reduced by using the predistorter, and when the predistorter is a part of the obtaining apparatus, no additional cost is generated, that is, the cost overhead is avoided; after receiving the transmission signal, preprocessing the transmission signal to obtain calculation data which can be used for calculation, wherein the transmission signal is processed in various aspects including analog signal processing and analog-to-digital conversion, and the calculation data which is directly applied to calculation can be obtained in the process, so that a complex process of data acquisition in other methods can be avoided, and the calculation process is simplified; after the calculation data is obtained, the signal data of the original signal of the transmission signal before transmission is obtained, and the signal data of the original signal is regarded as theoretical data (namely data without loss), and before calculation, the theoretical data is determined as sending data, and the calculation data is determined as receiving data, so that the source of the data is fixed, and further, the subsequent data is conveniently substituted, so that the calculation process is simplified; and substituting the two kinds of data into a preset calculation formula on the basis of the determination of the sending data and the receiving data, and calculating to obtain a Modulation Error Rate (MER). Therefore, by implementing the implementation mode, the cost can be reduced through the use of the predistorter, and the complexity of calculation can be simplified through the selection of data and the calculation of a preset formula, so that the calculation difficulty is reduced, the calculation efficiency is improved, and the acquisition efficiency of the modulation error rate is higher.
Further, the transmission signal is obtained through power amplification, frequency adjustment, filtering and analog-to-digital conversion.
In the implementation process, the transmission signal is a signal obtained by performing power amplification through an LNA (low noise amplifier), performing frequency conversion through a frequency converter, filtering through a filter, and finally converting through an analog-to-digital converter. It can be seen that the above-mentioned precondition that the transmission signal can be processed during the execution of the method is that, in the method, such limitation can improve the accuracy and stability of the transmission signal, thereby improving the calculation accuracy of the method.
Further, the step of preprocessing the transmission signal to obtain calculation data for calculation includes:
filtering the transmission signal to obtain a first conversion signal;
carrying out in-phase quadrature modulation on the first conversion signal to obtain a second conversion signal;
performing power matching on the second conversion signal to obtain a third conversion signal;
and carrying out synchronous processing on the third conversion signal to obtain calculation data for calculation.
In the implementation process, a manner of acquiring the calculation data is defined, wherein the process includes four steps of filtering operation on the transmission signal, IQ correction operation, power matching operation, and synchronization processing operation, and finally the calculation data for calculation is obtained. The four steps can limit the acquisition process of the calculated data, so that the calculated data is more accurate, and the calculation accuracy of the Modulation Error Rate (MER) is improved.
Further, the step of calculating according to the sending data, the receiving data and a preset calculation formula to obtain the modulation error rate includes:
acquiring first in-phase data and first quadrature data included in the transmission data and second in-phase data and second quadrature data included in the reception data;
calculating to obtain sampling data according to the first in-phase data and the first orthogonal data, and calculating to obtain error data according to the first in-phase data, the first orthogonal data, the second in-phase data and the second orthogonal data;
and substituting the sampling data and the error data into the calculation formula to calculate to obtain the modulation error rate.
In the implementation process, in-phase data and quadrature data in the two data of the sending data and the receiving data can be refined, and preliminary calculation is performed according to the four acquired data to obtain two intermediate data (namely sampling data and error data), so that the sampling data and the intermediate data can be directly substituted into a formula for calculation, and further the difficulty of calculation is reduced.
Further, the calculation formula includes:
wherein, I _ TXiIs the first in-phase data;
Q_TXiis the first orthogonal data;
I_RXiis the second in-phase data;
Q_RXithe second orthogonal data;
PW _ DATA is the sampled DATA;
ERROR _ DATA is the ERROR DATA;
MER is the modulation error rate.
In the implementation process, the calculation formula is a formula group, so that the formula can be suitable for different calculation conditions, when the sampling data and the error data are acquired, only the third equation of the calculation formula needs to be substituted, but when the sampling data and the error data are not calculated, the final modulation error rate can be calculated according to the in-phase data and the orthogonal data. On the other hand, since the calculation formula is also a method of calculating the sample data and the error data, the calculation formula can have an effect of easily calculating the modulation error rate in many respects.
A second aspect of the embodiments of the present application provides an apparatus for obtaining a modulation error rate, where the apparatus for obtaining a modulation error rate includes:
a receiving unit for receiving the transmission signal through the predistorter;
the processing unit is used for preprocessing the transmission signal to obtain calculation data for calculation;
a determining unit, configured to acquire theoretical data corresponding to the transmission signal, determine the theoretical data as transmission data, and determine the calculation data as reception data;
and the calculating unit is used for calculating according to the sending data, the receiving data and a preset calculation formula to obtain the modulation error rate.
In the implementation process, the transmission signal may be received in advance by a predistorter included in the receiving unit, where the predistorter may be a part of the receiving unit, that is, a part of the obtaining device for modulating the bit error rate; it may also be an external predistorter, i.e. a receiving unit included in the control device associated with the means for obtaining the modulation error rate. Therefore, the cost can be reduced by using the predistorter included in the receiving unit, and when the predistorter is a part of the acquiring device, no additional cost is generated, and the cost overhead can be avoided; in addition, after the processing unit receives the transmission signal, the transmission signal is preprocessed to obtain calculation data which can be used for calculation, in the process, the processing unit carries out multi-aspect processing on the transmission signal, wherein the multi-aspect processing comprises analog signal processing and analog-to-digital conversion processing, and calculation data which can be directly applied to calculation can be obtained in the operation process of the processing unit, so that the complex operation of data acquisition in other devices can be avoided, and the calculation process is simplified; after the processing unit completes the processing operation, the determining unit may obtain the calculation data, obtain the signal data of the original signal of the transmission signal before transmission, and regard the signal data of the original signal as theoretical data (i.e., data without loss), before the calculation, the determining unit may further determine the theoretical data as transmission data, and determine the calculation data as reception data, so that the source of the data is fixed, and further, the subsequent data is conveniently substituted, so as to simplify the calculation process; on the basis of the determination of the sending data and the receiving data, the calculating unit substitutes the two data into a preset calculating formula and calculates to obtain a Modulation Error Rate (MER). Therefore, by implementing the implementation mode, the device for acquiring the modulation error rate can reduce the cost through the predistorter included by the receiving unit, can complete the selection of data through the processing unit, the determining unit and the calculating unit, and can simplify the complexity of calculation according to the preset formula, thereby reducing the calculation difficulty, improving the calculation efficiency, and further enabling the acquisition efficiency of the modulation error rate to be higher.
Further, the processing unit includes:
the filtering subunit is used for filtering the transmission signal to obtain a first conversion signal;
the syndrome unit is used for carrying out in-phase quadrature modulation on the first conversion signal to obtain a second conversion signal;
the matching subunit is used for performing power matching on the second conversion signal to obtain a third conversion signal;
and the synchronization subunit is used for performing synchronization processing on the third conversion signal to obtain calculation data for calculation.
In the implementation process, the configuration of the internal sub-units of the processing unit is defined, wherein the filtering sub-unit is used for completing the filtering operation on the transmission signal, the correcting sub-unit is used for completing the operation of IQ correction, the matching sub-unit is used for completing the operation of power matching, and the synchronizing sub-unit is used for completing the synchronization processing and obtaining the calculation data for calculation. Therefore, the four subunits can limit the acquisition process of the calculated data in the device, so that the acquisition precision of the calculated data is improved through the subunits in the device, and the calculation accuracy of the modulation error rate can be improved.
Further, the calculation unit includes:
an obtaining subunit, configured to obtain first in-phase data and first quadrature data included in the transmission data and second in-phase data and second quadrature data included in the reception data;
the calculating subunit is configured to calculate to obtain sampling data according to the first in-phase data and the first quadrature data, and calculate to obtain error data according to the first in-phase data, the first quadrature data, the second in-phase data, and the second quadrature data;
and the calculating subunit is further configured to substitute the sampling data and the error data into the calculation formula to calculate, so as to obtain a modulation error rate.
In the implementation process, the obtaining subunit can obtain in-phase data and quadrature data in the two data of the sending data and the receiving data, and perform preliminary calculation according to the four obtained data through the calculating subunit to obtain two intermediate data (i.e. sampling data and error data), so that the calculating subunit can directly substitute the sampling data and the intermediate data into a formula for calculation, thereby reducing the difficulty of calculation.
A third aspect of the embodiments of the present application provides an electronic device, including a memory and a processor, where the memory is used to store a computer program, and the processor runs the computer program to make the computer device execute the method for obtaining a modulation error rate according to any one of the first aspect of the embodiments of the present application.
A fourth aspect of the embodiments of the present application provides a computer-readable storage medium, which stores computer program instructions, where the computer program instructions, when read and executed by a processor, perform the method for obtaining a modulation error rate according to any one of the first aspect of the embodiments of the present application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic flowchart of a method for obtaining a modulation error rate according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of another modulation error rate obtaining method according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an apparatus for obtaining a modulation error rate according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another modulation error rate obtaining apparatus according to an embodiment of the present disclosure;
fig. 5 is a schematic flowchart of a transmission signal acquisition process according to an embodiment of the present disclosure;
fig. 6 is a schematic flowchart of a process of acquiring calculation data according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Example 1
Referring to fig. 1, fig. 1 is a schematic flowchart illustrating a method for obtaining a modulation error rate according to an embodiment of the present disclosure. The method for acquiring the modulation error rate can be applied to DTMB (digital multimedia broadcasting terrestrial) and is used for monitoring the quality of a wireless channel in real time, so that the normal operation of an exciter and a transmitter is ensured. The method for acquiring the modulation error rate comprises the following steps:
s101, receiving a transmission signal through a predistorter.
In this embodiment, the transmission signal is obtained through power amplification, frequency adjustment, filtering, and analog-to-digital conversion. It is understood that the transmission signal is obtained by an LNA (low noise amplifier), a frequency converter, a filter, and an analog-to-digital converter.
In this embodiment, predistortion refers to a predistortion technique, which is essentially a widely used rf power amplifier linearization technique, and can be used as a stand-alone unit due to its simplicity, so that this technique has been widely used.
In the present embodiment, the predistorter is a device having the above predistortion function or using the above predistortion technique. In general, the predistorter is simple in use and construction, so that the cost of using the device is greatly reduced; on the other hand, the setting position of the predistorter can be in the obtaining device for modulating the bit error rate or in the corresponding modulating device, that is, the predistorter is a part of the obtaining device, so that no additional device is needed to perform corresponding operations, and from this aspect, no additional cost is generated by the predistorter, thereby reducing the overhead of the overall cost.
In this embodiment, the predistortion process may be in an FPGA board (field programmable gate array board), so the execution main body may also be the FPGA board; meanwhile, the transmission signal can also be received by the FPGA.
As shown in fig. 5, fig. 5 is a flowchart for acquiring a transmission signal provided in the present embodiment, wherein it can be seen that the transmission signal is acquired by an LNA (Low Noise Amplifier), a frequency converter, a filter, and an analog-to-digital converter. I.e. the above-mentioned transmission signal is obtained by power amplification, frequency adjustment, filtering and analog-to-digital conversion.
In this embodiment, the transmission signal is signal data received through a receiving channel.
In this embodiment, the existing modulation device (which may also be an obtaining device for modulating the bit error rate, and the two functions are identical and only named differently) needs to transmit data and also needs to receive the transmitted data (through a built-in digital predistorter), so that the step may use the existing receiving channel to receive the transmission signal (signal data), and thus, the method does not need to add extra hardware cost.
S102, preprocessing the transmission signals to obtain calculation data for calculation.
In this embodiment, the pretreatment may be various types of pretreatment, and is not limited in this embodiment. Specifically, the pre-processing may be pre-distortion processing.
In this embodiment, the principle of predistortion is that a predistortion element is cascaded with a power amplifier element, and the nonlinear distortion function is built in a digital and digital baseband signal processing domain, which is equivalent (or equal) to the amount of distortion exhibited by the amplifier, but the function is opposite. Combining these two non-linear distortion functions enables a highly linear, distortion-free system to be achieved. The challenge of digital predistortion techniques is that the distortion (i.e., non-linear) characteristics of the power amplifier components vary with time, temperature, and bias voltage, which vary from device to device. Thus, while it is possible to characterize and design the correct predistortion algorithm for one device, it is economically infeasible to do this for every device. To solve the above-mentioned deviation, we must use a feedback mechanism to sample the output signal and correct the predistortion algorithm. Digital predistortion implements this predistorter using digital circuitry, typically accomplished using digital signal processing. The nonlinearity of the power amplifier is compensated by adding a nonlinear circuit. This allows the use of a simple class AB platform within the power amplifier (power amplifier element) and thus eliminates the burden and complexity of base station manufacturers in manufacturing feed forward amplifiers. In addition, system efficiency can be significantly improved since the amplifier no longer requires an error amplifier distortion correction circuit.
In this embodiment, the class AB platform refers to a combined amplifier of a power amplifier (class a amplifier) and a linear amplifier (class B amplifier), which is a design compatible with the advantages of both class a and class B power amplifiers.
In this embodiment, the pre-processed object is a transmission signal, and the obtained result is calculation data, where the transmission signal is a digital signal, and the process is to perform sampling and sorting on data in the digital signal, so details of this point will not be repeated in this embodiment.
And S103, acquiring theoretical data corresponding to the transmission signal, determining the theoretical data as transmission data, and determining the calculation data as reception data.
In this embodiment, the theoretical data is data information before transmission of the transmission signal, or the theoretical data may be data of the transmission signal that is not subjected to any interference before transmission, or the theoretical data may be theoretically optimal data information received.
In the present embodiment, the purpose of determining the theoretical data as the transmission data and the calculation data as the reception data is to simplify the calculation, thereby reducing the overall calculation load and improving the calculation efficiency.
And S104, calculating according to the sending data, the receiving data and a preset calculation formula to obtain the modulation error rate.
In this embodiment, the sending data and the receiving data may be substituted into a preset calculation formula for calculation, so as to obtain a final modulation error rate.
In this embodiment, the preset calculation formula may be a combination formula or a formula group, and is not limited in this embodiment.
In this embodiment, the method may be applied to DTMB (GB20600-2006, referred to as Digital Terrestrial Multimedia Broadcast). The original name of the DTMB is DMB-T/H (Digital Multimedia Broadcast-Terrestrial/Handheld), which is a standard of Digital video broadcasting in china and is a system related to Digital television and mobile Digital broadcasting established by the country. Wherein the system would serve half of the television audience in china, especially in suburban and rural areas.
In this embodiment, the DTMB has two modes, i.e. multiple subcarriers (abbreviated as "heavy carriers") and single subcarrier (abbreviated as "single carrier"). However, only the data transmission standard defined by DTMB is MPEG-TS (a data transmission standard), but the transmission standard does not specify a broadcast stream coding system.
In this embodiment, the above steps may be implemented by an obtaining device for modulating the bit error rate, or may also be a control device corresponding to the obtaining device for modulating the bit error rate, which is not limited in this embodiment. The modulation error rate obtaining device may be a modulation device itself (an internal predistorter) or an external controller with a predistorter.
It can be seen that, when the method for acquiring the modulation error rate described in fig. 1 is implemented, the transmission signal can be received by a predistorter in advance, where the predistorter may be a part of the apparatus for acquiring the modulation error rate, or may be an external predistorter, so that the cost can be reduced by using the predistorter, and when the predistorter is a part of the apparatus for acquiring the modulation error rate, no additional cost is generated, that is, the cost overhead is avoided; the method can also be used for preprocessing the transmission signal after receiving the transmission signal to obtain the calculation data which can be used for calculation, so that the transmission signal is processed in various aspects in the process, the processing can comprise analog signal processing and analog-to-digital conversion processing, and the process can acquire the calculation data which is directly applied to calculation, thereby avoiding the complex process of data acquisition in other methods and further simplifying the calculation process; the method can also obtain the signal data of the original signal of the transmission signal before transmission after obtaining the calculation data, and regard the signal data of the original signal as theoretical data (namely data without loss), meanwhile, the step can determine the theoretical data as sending data before the calculation, and determine the calculation data as receiving data, thereby fixing the participating calculation data, facilitating the subsequent data substitution, and simplifying the calculation process; finally, the method can substitute the two data into a preset calculation formula on the basis of the determination of the sending data and the receiving data, and then calculate, so as to obtain the modulation error rate. Therefore, by implementing the implementation mode, the cost can be reduced through the use of the predistorter, and the complexity of calculation can be simplified through the selection of data and the calculation of a preset formula, so that the calculation difficulty is reduced, the calculation efficiency is improved, and the acquisition efficiency of the modulation error rate is higher.
Example 2
Referring to fig. 2, fig. 2 is a schematic flowchart of another modulation error rate obtaining method according to an embodiment of the present disclosure. The flow chart of the method for obtaining the modulation error rate described in fig. 2 is obtained by modifying the flow chart of the method for obtaining the modulation error rate described in fig. 1. The method for acquiring the modulation error rate comprises the following steps:
s201, receiving a transmission signal through a predistorter.
In this embodiment, the transmission signal is obtained through power amplification, frequency adjustment, filtering, and analog-to-digital conversion. It is understood that the transmission signal is obtained by an LNA (low noise amplifier), a frequency converter, a filter, and an analog-to-digital converter.
In this embodiment, the transmission signal is a signal obtained by performing power amplification by an LNA (low noise amplifier), performing frequency conversion by a frequency converter, filtering by a filter, and finally converting by an analog-to-digital converter. It can be seen that the above-mentioned precondition that the transmission signal can be processed during the execution of the method is that, in the method, such limitation can improve the accuracy and stability of the transmission signal, thereby improving the calculation accuracy of the method.
In this embodiment, predistortion refers to a predistortion technique, which is essentially a widely used rf power amplifier linearization technique, and can be used as a stand-alone unit due to its simplicity, so that this technique has been widely used.
In the present embodiment, the predistorter is a device having the above predistortion function or using the above predistortion technique. In general, the predistorter is simple in use and construction, so that the cost of using the device is greatly reduced; on the other hand, the setting position of the predistorter can be in the obtaining device for modulating the bit error rate or in the corresponding modulating device, that is, the predistorter is a part of the obtaining device, so that no additional device is needed to perform corresponding operations, and from this aspect, no additional cost is generated by the predistorter, thereby reducing the overhead of the overall cost.
In this embodiment, the predistortion process may be in an FPGA board (Field-Programmable Gate Array board), and thus the execution main body may also be the FPGA board.
In this embodiment, the transmission signal is signal data received through a receiving channel.
In this embodiment, the existing modulation device (which may also be an obtaining device for modulating the bit error rate, and the two functions are identical and only named differently) needs to transmit data and also needs to receive the transmitted data (through a built-in digital predistorter), so that the step may use the existing receiving channel to receive the transmission signal (signal data), and thus, the method does not need to add extra hardware cost.
S202, filtering the transmission signal to obtain a first conversion signal.
In this embodiment, the filtering means is subject to actual conditions, and may be high-pass filtering or band-pass filtering, and this embodiment is not limited at all.
In this embodiment, the transmission signal is a digital signal, and the obtained first conversion signal is also a digital signal.
And S203, carrying out in-phase and quadrature modulation on the first conversion signal to obtain a second conversion signal.
In this embodiment, the in-phase quadrature modulation can be understood as IQ (in-phase quadrature) correction.
In this embodiment, the second conversion signal is also a digital signal.
And S204, performing power matching on the second conversion signal to obtain a third conversion signal.
In this embodiment, the power matching means matching according to power, and details of this embodiment are not described herein.
In this embodiment, the third converted signal is also a digital signal.
And S205, carrying out synchronous processing on the third conversion signal to obtain calculation data for calculation.
In this embodiment, the synchronization process includes synchronization of the original data and the received data.
Step S202 to step S205 are implemented to determine the obtaining manner of the calculation data, wherein the process includes four steps of filtering operation, IQ correction operation, power matching operation and synchronization processing operation on the transmission signal, and finally the calculation data for calculation is obtained. The four steps can limit the acquisition process of the calculated data, so that the calculated data is more accurate, and the calculation accuracy of the modulation error rate is improved.
As shown in fig. 6, fig. 6 is a flowchart for acquiring the calculated data provided in the present embodiment, wherein a predistortion process before calculating the data, that is, the predistortion process described in step S202 to step S205, can be seen in the flowchart.
And S206, acquiring theoretical data corresponding to the transmission signal, determining the theoretical data as transmission data, and determining the calculation data as reception data.
In this embodiment, the theoretical data is data information before transmission of the transmission signal, or the theoretical data may be data that is not interfered by the transmission signal before transmission, or the theoretical data may be theoretically received optimal data information
In the present embodiment, the purpose of determining the theoretical data as the transmission data and the calculation data as the reception data is to simplify the calculation, thereby reducing the overall calculation load and improving the calculation efficiency.
S207, obtain first in-phase data and first quadrature data included in the transmission data and second in-phase data and second quadrature data included in the reception data.
In this embodiment, the transmission data includes first in-phase data and first quadrature data.
In this embodiment, the received data includes second in-phase data and second quadrature data.
In this embodiment, the data may be a pair or a group of data appearing in pairs or in pairs.
And S208, calculating to obtain sampling data according to the first in-phase data and the first orthogonal data, and calculating to obtain error data according to the first in-phase data, the first orthogonal data, the second in-phase data and the second orthogonal data.
In this embodiment, the formula included in step S209 may be referred to as a calculation method, and details of this embodiment are not repeated.
And S209, substituting the sampling data and the error data into a calculation formula for calculation to obtain the modulation error rate.
As an alternative implementation, the calculation formula includes:
wherein, I _ Txi is first in-phase data;
q _ TXi is first quadrature data;
i _ RXi is second in-phase data;
q _ RXi is second quadrature data;
PW _ DATA is sampled DATA;
ERROR _ DATA is ERROR DATA;
MER is the modulation error rate.
By implementing the implementation manner of step S206 to step S209, in-phase data and quadrature data in the two data of the transmission data and the reception data may be refined, and preliminary calculation may be performed according to the four data obtained above to obtain two intermediate data (i.e., sampling data and error data), so that the sampling data and the intermediate data may be directly substituted into a formula for calculation, thereby reducing the difficulty in calculation. Meanwhile, the calculation formula (formula group) can be suitable for different calculation conditions, when the sampling data and the error data are obtained, only the third equation of the calculation formula needs to be substituted, but when the sampling data and the error data are not calculated, the final Modulation Error Rate (MER) can be calculated according to the in-phase data and the orthogonal data. On the other hand, since the calculation formula is also a method of calculating the sample data and the error data, the calculation formula can have an effect of easily calculating the modulation error rate in many respects.
It can be seen that, by implementing the method for obtaining the modulation error rate described in fig. 2, the cost can be reduced by using the predistorter, and the complexity of calculation can be simplified by selecting data and calculating a preset formula, so that the calculation difficulty is reduced, the calculation efficiency is improved, and the obtaining efficiency of the modulation error rate is further improved.
Example 3
Please refer to fig. 3, fig. 3 is a schematic structural diagram of an apparatus for obtaining a modulation error rate according to an embodiment of the present disclosure. The device for obtaining the modulation error rate comprises:
a receiving unit 310, configured to receive a transmission signal through a predistorter;
a processing unit 320, configured to perform preprocessing on the transmission signal to obtain calculation data for calculation;
a determining unit 330, configured to acquire theoretical data corresponding to the transmission signal, determine the theoretical data as transmission data, and determine the calculation data as reception data;
the calculating unit 340 is configured to calculate according to the sending data, the receiving data, and a preset calculation formula to obtain a modulation error rate.
In this embodiment, the transmission signal is obtained through power amplification, frequency adjustment, filtering, and analog-to-digital conversion. It is understood that the transmission signal is obtained by an LNA (low noise amplifier), a frequency converter, a filter, and an analog-to-digital converter.
In this embodiment, the transmission signal is a signal obtained by performing power amplification by an LNA (low noise amplifier), performing frequency conversion by a frequency converter, filtering by a filter, and finally converting by an analog-to-digital converter. It can be seen that the precondition that the transmission signal can be processed in the present device needs to be referred to above, so in the method, such limitation can improve the accuracy and stability of the transmission signal, thereby improving the accuracy of the device in calculation.
In this embodiment, the receiving unit 310 may include a predistorter, and the receiving unit 310 is a part of an obtaining device (or a modulating device) for modulating the bit error rate, and meanwhile, the receiving unit 310 further includes other receiving devices, such as a signal receiver, which is not described in detail in this embodiment. It can be seen that the receiving unit 310 can achieve cost reduction.
In this embodiment, the relationship among the processing unit 320, the determining unit 330, and the calculating unit 340 is inseparable, and the processing of the data is performed by loop-to-loop, so that it can be seen that, under the cooperative work of the three, the Modulation Error Rate (MER) can be calculated easily, thereby improving the calculation efficiency and reducing the calculation difficulty.
In this embodiment, the apparatus for obtaining a modulation error rate may perform all the steps in the method for obtaining a modulation error rate, and may follow the explanation in the method for obtaining a modulation error rate, which is not described again in this embodiment.
It can be seen that, implementing the modulation error rate obtaining apparatus described in fig. 3, the transmission signal can be received in advance by the predistorter included in the receiving unit 310, where the predistorter may be a part of the receiving unit 310, that is, a part of the modulation error rate obtaining apparatus; a predistorter, which may also be external, is a receiving unit 310 included in the control device associated with the apparatus for obtaining the modulation error rate. It can be seen that the use of the predistorter included in the receiving unit 310 can reduce the cost, and when the predistorter is part of the above-mentioned obtaining apparatus, no additional cost is generated, and the overhead of the cost can be avoided; in addition, after the processing unit 320 receives the transmission signal, the transmission signal is preprocessed to obtain calculation data which can be used for calculation, in the process, the processing unit 320 performs multi-aspect processing on the transmission signal, wherein the multi-aspect processing includes analog signal processing and analog-to-digital conversion processing, and calculation data which can be directly applied to calculation can be acquired in the operation process of the processing unit 320, so that the complex operation of data acquisition in other devices can be avoided, and the calculation process is simplified; after the processing unit 320 completes the processing operation, the determining unit 330 may obtain the calculation data, obtain the signal data of the original signal of the transmission signal before transmission, and regard the signal data of the original signal as theoretical data (i.e., data without loss), before the calculation, the determining unit 330 may further determine the theoretical data as transmission data, and determine the calculation data as reception data, so as to fix the source of the data, thereby facilitating subsequent data substitution, and simplifying the calculation process; based on the above determination of the transmission data and the reception data, the calculation unit 340 substitutes the two data into a preset calculation formula and performs calculation, thereby obtaining a Modulation Error Rate (MER). It can be seen that, with this implementation, the device for acquiring a modulation error rate can reduce the cost by using the predistorter included in the receiving unit 310, and can complete the selection of data by using the processing unit 320, the determining unit 330, and the calculating unit 340, and simplify the complexity of calculation according to the preset formula, thereby reducing the calculation difficulty, improving the calculation efficiency, and further making the acquisition efficiency of a Modulation Error Rate (MER) higher.
Example 4
Referring to fig. 4, fig. 4 is a schematic structural diagram of another modulation error rate obtaining apparatus according to an embodiment of the present disclosure. The structure diagram of the apparatus for obtaining the modulation error rate depicted in fig. 4 is obtained by modifying the structure diagram of the apparatus for obtaining the modulation error rate depicted in fig. 3. In the apparatus for obtaining a modulation error rate, the processing unit 320 includes:
a filtering subunit 321, configured to filter the transmission signal to obtain a first converted signal;
a syndrome unit 322, configured to perform in-phase and quadrature modulation on the first converted signal to obtain a second converted signal;
a matching subunit 323, configured to perform power matching on the second converted signal to obtain a third converted signal;
and a synchronization subunit 324, configured to perform synchronization processing on the third converted signal, so as to obtain calculation data for calculation.
In this embodiment, the internal sub-units of the processing unit 320 are defined, wherein the filtering sub-unit 321 is used for completing the filtering operation on the transmission signal, the correcting sub-unit is used for completing the IQ correction operation, the matching sub-unit 323 is used for completing the power matching operation, and the synchronization sub-unit 324 is used for completing the synchronization process and obtaining the calculation data for calculation. Therefore, the four subunits can define the acquisition process of the calculated data in the device, so that the acquisition precision of the calculated data is improved through the subunits in the device, and the calculation accuracy of the Modulation Error Rate (MER) can be improved.
As an alternative implementation, the computing unit 340 includes:
an obtaining subunit 341, configured to obtain first in-phase data and first quadrature data included in the transmission data and second in-phase data and second quadrature data included in the reception data;
a calculation subunit 342, configured to calculate to obtain sampling data according to the first in-phase data and the first quadrature data, and calculate to obtain error data according to the first in-phase data, the first quadrature data, the second in-phase data, and the second quadrature data;
the calculating subunit 342 is further configured to substitute the sampling data and the error data into a calculation formula to calculate, so as to obtain the modulation error rate.
By implementing this embodiment, the obtaining subunit 341 may obtain in-phase data and quadrature data in the two data of the transmission data and the reception data, and perform preliminary calculation according to the four obtained data through the calculating subunit 342 to obtain two intermediate data (i.e., sampling data and error data), so that the calculating subunit 342 may directly substitute the sampling data and the intermediate data into a formula for calculation, thereby reducing the difficulty in calculation.
In this embodiment, the apparatus for obtaining a modulation error rate may perform all the steps in the method for obtaining a modulation error rate, and may follow the explanation in the method for obtaining a modulation error rate, which is not described again in this embodiment.
As an alternative embodiment, the calculation formula used in the calculation subunit 342 includes:
wherein, I _ Txi is first in-phase data;
q _ TXi is first quadrature data;
i _ RXi is second in-phase data;
q _ RXi is second quadrature data;
PW _ DATA is sampled DATA;
ERROR _ DATA is ERROR DATA;
MER is the modulation error rate.
It can be seen that, by implementing the apparatus for obtaining the modulation error rate described in fig. 4, the cost can be reduced by using the predistorter, and the complexity of calculation can be simplified by selecting data and calculating a preset formula, so that the calculation difficulty is reduced, the calculation efficiency is improved, and further the obtaining efficiency of the modulation error rate is higher.
An embodiment of the present application further provides an electronic device, which includes a memory and a processor, where the memory is used to store a computer program, and the processor runs the computer program to enable the computer device to execute the method for acquiring the modulation error rate according to any one of embodiment 1 and embodiment 2 of the present application.
The embodiment of the present application further provides a computer-readable storage medium, which stores computer program instructions, and when the computer program instructions are read and executed by a processor, the method for obtaining a modulation error rate according to any one of embodiment 1 and embodiment 2 of the present application is executed.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can 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 or unit, 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, each functional module or unit in the embodiments of the present application may be integrated together to form an independent part, or each module or unit may exist alone, or two or more modules or units may be integrated to form an independent part.
The above functions, if implemented in the form of software functional modules or software functional units and sold or used as a separate 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 above-described 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.
The above description is only an example of the present application and is not intended to limit the scope of 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 should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above disclosure is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the same element.
Claims (7)
1. A method for obtaining a modulation error rate (BER), comprising:
receiving a transmission signal through a built-in predistorter; the transmission signal is obtained by performing power amplification, frequency adjustment, filtering and analog-to-digital conversion on the DTMB signal;
carrying out pre-distortion processing on the transmission signal to obtain calculation data for calculation;
acquiring theoretical data corresponding to the transmission signals, determining the theoretical data as sending data, and determining the calculation data as receiving data;
acquiring first in-phase data and first quadrature data included in the transmission data and second in-phase data and second quadrature data included in the reception data;
calculating to obtain sampling data according to the first in-phase data and the first orthogonal data, and calculating to obtain error data according to the first in-phase data, the first orthogonal data, the second in-phase data and the second orthogonal data;
substituting the sampling data and the error data into a calculation formula for calculation to obtain a modulation error rate;
the calculation formula comprises:
wherein, I _ TXiIs the first in-phase data;
Q_TXiis the first orthogonal data;
I_RXiis the second in-phase data;
Q_RXithe second orthogonal data;
PW _ DATA is the sampled DATA;
ERROR _ DATA is the ERROR DATA;
MER is the modulation error rate.
2. The method of claim 1, wherein the transmission signal is obtained by power amplification, frequency adjustment, filtering and analog-to-digital conversion.
3. The method according to claim 1, wherein the step of preprocessing the transmission signal to obtain calculation data for calculation comprises:
filtering the transmission signal to obtain a first conversion signal;
carrying out in-phase quadrature modulation on the first conversion signal to obtain a second conversion signal;
performing power matching on the second conversion signal to obtain a third conversion signal;
and carrying out synchronous processing on the third conversion signal to obtain calculation data for calculation.
4. An apparatus for obtaining a modulation error rate, the apparatus comprising:
a receiving unit for receiving a transmission signal through a built-in predistorter; the transmission signal is obtained by performing power amplification, frequency adjustment, filtering and analog-to-digital conversion on the DTMB signal;
the processing unit is used for carrying out pre-distortion processing on the transmission signal to obtain calculation data for calculation;
a determining unit, configured to acquire theoretical data corresponding to the transmission signal, determine the theoretical data as transmission data, and determine the calculation data as reception data;
the calculation unit is used for calculating according to the sending data, the receiving data and a preset calculation formula to obtain a modulation error rate;
the calculation unit includes:
an obtaining subunit, configured to obtain first in-phase data and first quadrature data included in the transmission data and second in-phase data and second quadrature data included in the reception data;
the calculating subunit is configured to calculate to obtain sampling data according to the first in-phase data and the first quadrature data, and calculate to obtain error data according to the first in-phase data, the first quadrature data, the second in-phase data, and the second quadrature data;
the calculating subunit is further configured to substitute the sampling data and the error data into the calculation formula to calculate, so as to obtain a modulation error rate;
the calculation formula used in the calculation subunit 342 includes:
wherein, I _ Txi is first in-phase data;
q _ TXi is first quadrature data;
i _ RXi is second in-phase data;
q _ RXi is second quadrature data;
PW _ DATA is sampled DATA;
ERROR _ DATA is ERROR DATA;
MER is the modulation error rate.
5. The apparatus for obtaining a modulation error rate according to claim 4, wherein the processing unit comprises:
the filtering subunit is used for filtering the transmission signal to obtain a first conversion signal;
the syndrome unit is used for carrying out in-phase quadrature modulation on the first conversion signal to obtain a second conversion signal;
the matching subunit is used for performing power matching on the second conversion signal to obtain a third conversion signal;
and the synchronization subunit is used for performing synchronization processing on the third conversion signal to obtain calculation data for calculation.
6. An electronic device, characterized in that the electronic device comprises a memory for storing a computer program and a processor for executing the computer program to make the computer device execute the modulation error rate obtaining method according to any one of claims 1 to 3.
7. A readable storage medium, wherein computer program instructions are stored in the readable storage medium, and when the computer program instructions are read and executed by a processor, the method for obtaining a modulation error rate according to any one of claims 1 to 3 is performed.
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