Method, system and device for realizing flatness measurement processing of broadband signal receiver based on quadrature modulation and demodulation, processor and medium

Abstract

The invention relates to a method for realizing flatness measurement processing of a broadband signal receiver based on quadrature modulation and demodulation. The method comprises the following steps: generating and transmitting a single-carrier quadrature modulation signal; intercepting a section of digital baseband signal; demodulating the orthogonal modulation signal, and extracting a constellation point data sequence; performing reference point judgment; performing fast Fourier transform on the constellation point data sequence and the reference point sequence; obtaining frequency domain error data in a plural form; gaussian smoothing filtering is applied. According to the method, the system, the device, the processor and the computer readable storage medium for realizing flatness measurement processing of the broadband signal receiver based on quadrature modulation and demodulation, synchronous evaluation of amplitude and phase flatness of the broadband signal receiver is realized through one-time measurement, and the method, the system, the device and the processor have the characteristics of high efficiency and high speed; according to the method, the time required for flatness measurement is shortened, the measurement efficiency is improved, the method has the advantages of being comprehensive and accurate, the amplitude and flatness information of the broadband signal receiver can be obtained at the same time, and more comprehensive performance evaluation is provided.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to the fields of wireless signal reception processing, digital signal processing, and orthogonal modulation signal demodulation, and specifically refers to a method, system, device, processor, and computer-readable storage medium thereof for realizing flatness measurement processing of a broadband signal receiver based on orthogonal modulation and demodulation. Background Art

[0002] With the continuous development of wireless communication technology, the communication bandwidth is gradually becoming larger and larger, which puts higher requirements on wireless signal receiving equipment. The receiver needs to maintain uniform gain and phase response over a wider frequency range. As the bandwidth expands, the performance difference between RF components (such as amplifiers, filters, mixers, etc.) at high and low frequencies becomes more significant, making it more difficult to keep the overall frequency response flat. The RF components used in broadband receivers often exhibit different characteristics at different frequency points. For example, it is difficult for filters to achieve perfect frequency selectivity and low loss within a broadband range, and amplifiers may introduce more gain fluctuations or phase delays in certain frequency bands. These factors will affect the overall flatness of the receiver. In order to achieve flatness over a wider bandwidth, the receiver design requires more complex circuit design and higher-precision component matching. This increases the difficulty of design and manufacturing, and also increases the complexity of system debugging and calibration.

[0003] In broadband wireless communication systems, the flatness of the receiver (i.e., maintaining consistent gain and phase response across the entire operating frequency band) has a critical impact on system performance. Therefore, flatness measurement and calibration compensation become key steps to ensure efficient and reliable operation of the receiver.

[0004] For the measurement and estimation of receiver flatness, traditional methods such as Figure 1 As shown, the signal source first generates a single-tone sweep signal as the input signal of the receiver. After the signal is input to the receiver, it is down-converted and gain-controlled to make the signal amplitude within the appropriate range. Then, the intermediate frequency analog signal is converted into a digital signal through analog-to-digital conversion (ADC). The power of the signal is calculated in the digital baseband to obtain the received power value of each frequency point in the receiver band, that is, the flatness characteristic of the receiver. This flatness measurement method is simple and direct, but it also has the following disadvantages:

[0005] 1) The measurement time is long. Since it is necessary to scan the frequency and collect data point by point, the measurement time is long. Especially for high-resolution or wide-band measurements, this method may be too cumbersome and slow.

[0006] 2) Only the amplitude flatness of the receiver can be obtained, but the phase flatness cannot be obtained. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a method, system, device, processor and computer-readable storage medium thereof for realizing flatness measurement and processing of a broadband signal receiver based on orthogonal modulation and demodulation, which are fast, comprehensive and have a wide range of applications.

[0008] In order to achieve the above-mentioned object, the method, system, device, processor and computer-readable storage medium for realizing flatness measurement processing of a broadband signal receiver based on orthogonal modulation and demodulation of the present invention are as follows:

[0009] The method for realizing flatness measurement and processing of a broadband signal receiver based on orthogonal modulation and demodulation is mainly characterized in that the method comprises the following steps:

[0010] (1) A vector signal source generates and transmits a single-carrier orthogonal modulation signal with the same maximum bandwidth as a wideband signal receiver;

[0011] (2) transmitting the generated orthogonal modulation signal to a broadband signal receiver via a connecting line;

[0012] (3) The broadband signal receiver intercepts a digital baseband signal and transmits it to the host computer module;

[0013] (4) The host computer module demodulates the collected baseband data into orthogonal modulation signals and extracts the constellation point data sequence;

[0014] (5) According to the known reference signal constellation diagram, reference point determination is performed on the demodulated constellation point data sequence to obtain the corresponding ideal reference point sequence as a reference for error calculation;

[0015] (6) performing fast Fourier transform on the constellation point data sequence and the reference point sequence respectively to obtain their respective frequency domain expressions;

[0016] (7) subtracting the frequency domain data of the received signal from the frequency domain data of the reference signal to obtain frequency domain error data in complex form;

[0017] (8) Apply Gaussian smoothing filtering to the obtained amplitude flatness and phase flatness data to eliminate glitches and noise that occur during the measurement process.

[0018] Preferably, the step (2) specifically comprises the following steps:

[0019] (2.1) Transmitting the generated orthogonal modulated signal to a broadband signal receiver via a connecting line;

[0020] (2.2) The broadband signal receiver performs RF processing, down-conversion and gain control on the signal, and converts the intermediate frequency analog signal into a digital baseband signal through analog-to-digital conversion.

[0021] Preferably, the constellation point data sequence extracted in (4) represents the actual phase and amplitude of the received signal.

[0022] Preferably, the step (7) further includes separating the amplitude and phase of the error data, specifically including the following steps:

[0023] (7.1) Take the amplitude and logarithm of the frequency domain error data, calculate the amplitude flatness, and obtain the amplitude flatness characteristic curve of the broadband signal receiver;

[0024] (7.2) The phase of the frequency domain error data is taken to obtain phase error data, and the phase error is subjected to phase unwrapping processing to obtain the phase flatness characteristic curve of the broadband signal receiver.

[0025] Preferably, the amplitude flatness is calculated in step (7.1) as follows:

[0026] Amplitude flatness is calculated according to the following formula:

[0027] A dB =10lg[abs(E spec )];

[0028] Among them, E spec is the frequency domain error data in complex form.

[0029] The system for measuring and processing the flatness of a broadband signal receiver based on orthogonal modulation and demodulation has the following main features: the system includes a vector signal source, a broadband signal receiver and a host computer module; the output end of the vector signal source is connected to the broadband signal receiver; the output end of the broadband signal receiver is connected to the host computer module; the vector signal source is used to generate a single-carrier orthogonal modulation signal with the same maximum bandwidth as the broadband signal receiver, and output the single-carrier text modulation signal to the broadband signal receiver; the broadband signal receiver is used to receive the orthogonal modulation signal sent by the vector signal source, and perform radio frequency processing, down-conversion, gain control and analog-to-digital conversion to convert the received analog signal into a digital baseband signal; the host computer module is used to receive and process the digital baseband signal, and perform signal demodulation, Fourier transform and flatness calculation.

[0030] Preferably, the broadband signal receiver comprises

[0031] RF mixing and dynamic adjustment unit for RF processing, down-conversion and gain control;

[0032] An analog-to-digital conversion unit, connected to the radio frequency mixing and dynamic adjustment unit, for performing analog-to-digital conversion;

[0033] The digital baseband unit is connected to the analog-to-digital conversion unit and is used to convert the received analog signal into a digital baseband signal.

[0034] The device for realizing flatness measurement processing of a broadband signal receiver based on orthogonal modulation and demodulation has the following main features: the device comprises:

[0035] a processor configured to execute computer executable instructions;

[0036] The memory stores one or more computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the method for measuring the flatness of a broadband signal receiver based on orthogonal modulation and demodulation are implemented.

[0037] The main feature of the processor for realizing flatness measurement processing of a wideband signal receiver based on orthogonal modulation and demodulation is that the processor is configured to execute computer executable instructions. When the computer executable instructions are executed by the processor, the various steps of the method for realizing flatness measurement processing of a wideband signal receiver based on orthogonal modulation and demodulation are realized.

[0038] The main feature of the computer-readable storage medium is that a computer program is stored thereon, and the computer program can be executed by a processor to implement the various steps of the above-mentioned method for realizing flatness measurement processing of a broadband signal receiver based on orthogonal modulation and demodulation.

[0039] The method, system, device, processor and computer-readable storage medium thereof for realizing flatness measurement and processing of a broadband signal receiver based on orthogonal modulation and demodulation of the present invention are adopted, and synchronous evaluation of amplitude and phase flatness of a broadband signal receiver is realized through one-time measurement. The method has the characteristics of high efficiency and speed, and adopts a single-carrier orthogonal modulation signal for measurement, and does not need point-by-point frequency sweeping, which significantly shortens the time required for flatness measurement and improves measurement efficiency. The method is particularly suitable for flatness evaluation of high resolution and wide frequency band. The method has the characteristics of comprehensiveness and accuracy, and can simultaneously obtain amplitude and flatness information of a broadband signal receiver, provide a more comprehensive performance evaluation, make up for the deficiency that the traditional method can only measure amplitude flatness, and improve the accuracy and reliability of the measurement result. The method has the characteristics of high precision, and effectively reduces the error in the measurement process through the high-precision calibration of a vector signal source and the digital signal processing technology, ensures the high precision of the flatness measurement result, and meets the strict requirements of modern broadband signal receivers for flatness. The method has the characteristics of high automation, and the entire measurement process is automatically completed by a host computer module, from signal generation, reception, demodulation to flatness calculation, and achieves a high degree of automation, reduces manual intervention and operation complexity, and improves the consistency and repeatability of measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a connection diagram for receiver flatness measurement based on single-tone frequency sweep of the signal source.

[0041] Figure 2 The present invention is a schematic diagram of flatness measurement connection of a method for implementing flatness measurement processing of a broadband signal receiver based on orthogonal modulation and demodulation.

[0042] Figure 3 The demodulation result of the receiver host computer software acquisition data of the method for realizing the flatness measurement and processing of a broadband signal receiver based on orthogonal modulation and demodulation of the present invention.

[0043] Figure 4 The measured results of amplitude flatness of the method for implementing flatness measurement of a broadband signal receiver based on orthogonal modulation and demodulation of the present invention are shown.

[0044] Figure 5 The phase flatness measurement result of the method for realizing flatness measurement and processing of a broadband signal receiver based on orthogonal modulation and demodulation of the present invention is shown. DETAILED DESCRIPTION

[0045] In order to more clearly describe the technical content of the present invention, further description is given below in conjunction with specific embodiments.

[0046] The method for measuring the flatness of a broadband signal receiver based on orthogonal modulation and demodulation of the present invention comprises the following steps:

[0047] (1) A vector signal source generates and transmits a single-carrier orthogonal modulation signal with the same maximum bandwidth as a wideband signal receiver;

[0048] (2) transmitting the generated orthogonal modulation signal to a broadband signal receiver via a connecting line;

[0049] (3) The broadband signal receiver intercepts a digital baseband signal and transmits it to the host computer module;

[0050] (4) The host computer module demodulates the collected baseband data into orthogonal modulation signals and extracts the constellation point data sequence;

[0051] (5) According to the known reference signal constellation diagram, reference point determination is performed on the demodulated constellation point data sequence to obtain the corresponding ideal reference point sequence as a reference for error calculation;

[0052] (6) performing fast Fourier transform on the constellation point data sequence and the reference point sequence respectively to obtain their respective frequency domain expressions;

[0053] (7) subtracting the frequency domain data of the received signal from the frequency domain data of the reference signal to obtain frequency domain error data in complex form;

[0054] (8) Apply Gaussian smoothing filtering to the obtained amplitude flatness and phase flatness data to eliminate glitches and noise that occur during the measurement process.

[0055] As a preferred embodiment of the present invention, the step (2) specifically comprises the following steps:

[0056] (2.1) Transmitting the generated orthogonal modulated signal to a broadband signal receiver via a connecting line;

[0057] (2.2) The broadband signal receiver performs RF processing, down-conversion and gain control on the signal, and converts the intermediate frequency analog signal into a digital baseband signal through analog-to-digital conversion.

[0058] As a preferred embodiment of the present invention, the constellation point data sequence extracted in (4) represents the actual phase and amplitude of the received signal.

[0059] As a preferred embodiment of the present invention, the step (7) further includes separating the amplitude and phase of the error data, which specifically includes the following steps:

[0060] (7.1) Take the amplitude and logarithm of the frequency domain error data, calculate the amplitude flatness, and obtain the amplitude flatness characteristic curve of the broadband signal receiver;

[0061] (7.2) The phase of the frequency domain error data is taken to obtain phase error data, and the phase error is subjected to phase unwrapping processing to obtain the phase flatness characteristic curve of the broadband signal receiver.

[0062] As a preferred embodiment of the present invention, the amplitude flatness is calculated in step (7.1) as follows:

[0063] Amplitude flatness is calculated according to the following formula:

[0064] A dB =10lg[abs(E spec )];

[0065] Among them, E spec is the frequency domain error data in complex form.

[0066] The system for measuring the flatness of a broadband signal receiver based on orthogonal modulation and demodulation of the present invention comprises a vector signal source, a broadband signal receiver and a host computer module, wherein the output end of the vector signal source is connected to the broadband signal receiver, and the output end of the broadband signal receiver is connected to the host computer module, the vector signal source is used to generate a single-carrier orthogonal modulation signal with the same maximum bandwidth as the broadband signal receiver, and output the single-carrier text modulation signal to the broadband signal receiver, the broadband signal receiver is used to receive the orthogonal modulation signal sent by the vector signal source, and perform radio frequency processing, down-conversion, gain control and analog-to-digital conversion, and convert the received analog signal into a digital baseband signal, and the host computer module is used to receive and process the digital baseband signal, and perform signal demodulation, Fourier transform and flatness calculation.

[0067] As a preferred embodiment of the present invention, the broadband signal receiver comprises

[0068] RF mixing and dynamic adjustment unit for RF processing, down-conversion and gain control;

[0069] An analog-to-digital conversion unit, connected to the radio frequency mixing and dynamic adjustment unit, for performing analog-to-digital conversion;

[0070] The digital baseband unit is connected to the analog-to-digital conversion unit and is used to convert the received analog signal into a digital baseband signal.

[0071] The device for realizing flatness measurement of a broadband signal receiver based on orthogonal modulation and demodulation of the present invention comprises:

[0072] a processor configured to execute computer executable instructions;

[0073] The memory stores one or more computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the method for measuring the flatness of a broadband signal receiver based on orthogonal modulation and demodulation are implemented.

[0074] The processor of the present invention is used to implement the flatness measurement processing of a wideband signal receiver based on orthogonal modulation and demodulation, wherein the processor is configured to execute computer executable instructions. When the computer executable instructions are executed by the processor, the various steps of the method for implementing the flatness measurement processing of a wideband signal receiver based on orthogonal modulation and demodulation are implemented.

[0075] The computer-readable storage medium of the present invention stores a computer program thereon, and the computer program can be executed by a processor to implement the various steps of the above-mentioned method for realizing flatness measurement processing of a broadband signal receiver based on orthogonal modulation and demodulation.

[0076] With the rapid development of wireless communication technology, communication systems have increasingly higher requirements on receiver performance. In particular, in the design of broadband signal receivers, how to maintain the flatness of the receiver's gain and phase response over a wide frequency range has become a major challenge. The existing receiver flatness measurement methods have the following main technical problems:

[0077] Low measurement efficiency: Traditional flatness measurement methods rely on single-tone swept frequency signals to collect data point by point. Especially in the case of high-resolution or wide-band measurements, the required measurement time increases significantly, making the overall measurement process too cumbersome and slow, which is not conducive to real-time monitoring and rapid calibration.

[0078] Incomplete measurement results: Existing methods usually only obtain the amplitude flatness of the receiver, but cannot obtain phase flatness information at the same time. However, changes in phase response will also have a significant impact on the overall performance of the receiver. The lack of phase flatness measurement limits the comprehensive evaluation of receiver performance.

[0079] Insufficient accuracy: Traditional methods have limited measurement accuracy at high and low frequencies, especially when the performance of RF components varies greatly. It is difficult to accurately reflect the true flatness characteristics of the receiver over the entire bandwidth.

[0080] Low degree of automation: Since the measurement process relies on manual adjustment and point-by-point acquisition, it is difficult to achieve high automation, which increases the complexity of manual operation and the risk of error, affecting the consistency and reliability of the measurement.

[0081] In a specific embodiment of the present invention, based on a single-carrier orthogonal modulation signal, the amplitude and phase flatness within the broadband signal receiver band are measured at one time. The measurement connection relationship is as follows: Figure 2 shown.

[0082] The steps to measure flatness are as follows:

[0083] 1) The vector signal source sends a single-carrier orthogonal modulation signal (such as QPSK, 16QAM, etc.) with the same maximum bandwidth as the wideband signal receiver. The vector signal source has excellent flatness characteristics after good measurement and calibration. In the subsequent flatness measurement, the flatness error of the vector signal source itself can be ignored.

[0084] 2) After the orthogonal modulated signal is input into the broadband signal receiver, it is converted into a digital signal with a zero intermediate frequency through the radio frequency (RF) path, analog-to-digital conversion (ADC) and digital baseband, and a segment of the digital signal is intercepted and transmitted to the host computer module.

[0085] 3) The host computer module demodulates the incoming baseband data to obtain the constellation point data of the orthogonal modulation signal.

[0086] 4) Make a reference point decision on the constellation point data sequence to obtain the corresponding reference point sequence.

[0087] 6) Perform Fourier transform (FFT) on the constellation point and reference point data respectively to obtain their respective frequency domain data.

[0088] 7) Subtract the constellation point frequency domain data from the reference point frequency domain data to obtain the frequency domain error, and take the amplitude logarithm of the error result to obtain the amplitude flatness; take the phase of the error result, perform phase unwrapping on the phase result to obtain the phase flatness.

[0089] 8) Gaussian smoothing is performed on the amplitude flatness and phase flatness to eliminate burrs.

[0090] The flatness measurement scheme of the present invention mainly includes the following parts:

[0091] Vector Signal Generator (VSG): used to generate a single-carrier quadrature modulation signal (such as QPSK, 16QAM, etc.) with the same maximum bandwidth as the wideband signal receiver, and is precisely calibrated to ensure that its own flatness error is negligible.

[0092] Wideband signal receiver: As the device under test, it receives the orthogonal modulated signal sent by the vector signal source, and performs RF processing, down-conversion, gain control and analog-to-digital conversion to convert the received analog signal into a digital baseband signal.

[0093] Host computer module: installed on the computer, used to receive and process the digital baseband signal transmitted from the broadband signal receiver, and perform functions such as signal demodulation, Fourier transform and flatness calculation.

[0094] The measuring steps of the present invention are as follows:

[0095] (1) Signal generation: The vector signal source generates a single-carrier quadrature modulated signal that matches the maximum bandwidth of the wideband signal receiver. The signal source is strictly measured and calibrated to ensure that the amplitude and phase characteristics of the signal are highly flat.

[0096] (2) Signal transmission and reception: The generated orthogonal modulated signal is transmitted to the broadband signal receiver through a connecting line. The broadband signal receiver performs RF processing, down-conversion and gain control on the signal, and then converts the intermediate frequency analog signal into a digital baseband signal through analog-to-digital conversion.

[0097] (3) Data acquisition: The broadband signal receiver intercepts a segment of digital baseband signal and transmits it to the host computer module for subsequent processing.

[0098] (4) Signal demodulation: The host computer module demodulates the collected baseband data into orthogonal modulated signals and extracts the constellation point data sequence, which represents the actual phase and amplitude of the received signal.

[0099] (5) Reference point determination: Based on the known reference signal constellation diagram, the reference point determination is performed on the demodulated constellation point data sequence to obtain the corresponding ideal reference point sequence as the basis for error calculation. Figure 3 As shown in the figure, the signal source inputs a 16QAM modulated signal, the blue discrete points are the constellation point data sequence of the demodulation result, and the black "×" is the reference point sequence corresponding to the constellation point data, that is, ideal data without distortion. The measured data is affected by the non-ideal flatness characteristics of the broadband signal receiver, resulting in the data points being randomly scattered around the reference point.

[0100] (6) Frequency domain conversion: Perform fast Fourier transform (FFT) on the constellation point data sequence and the reference point sequence respectively to obtain their respective frequency domain expressions.

[0101] (7) Error calculation: Subtract the frequency domain data of the received signal from the frequency domain data of the reference signal to obtain the frequency domain error data in complex form. Separate the error data into amplitude and phase:

[0102] Amplitude flatness: Take the amplitude and logarithm of the frequency domain error data to obtain the amplitude flatness characteristic curve of the broadband signal receiver:

[0103] A dB =10lg[abs(E spec )]

[0104] Among them, E spec is the frequency domain error data in complex form.

[0105] Phase flatness: Take the phase Φ = arctann(E spec ) to obtain phase error data, perform phase unwrapping processing on the phase error, and obtain a phase flatness characteristic curve of the broadband signal receiver.

[0106] (8) Data smoothing: In order to eliminate noise and slight fluctuations, Gaussian smoothing filtering is applied to the obtained amplitude flatness and phase flatness data to eliminate burrs and noise that occur during the measurement process and improve the smoothness and accuracy of the measurement results.

[0107] In a specific embodiment of the present invention, Figure 3 , Figure 4 and Figure 5 This is the test result of using a 600MHz bandwidth signal receiving module. The signal source inputs a 600MHz 16QAM modulated signal.

[0108] Figure 3It is the result of data demodulation constellation diagram collected by the broadband signal receiver. The horizontal axis is the real part, the vertical axis is the imaginary part, the blue dots are the constellation point data sequence of the demodulation result, and the black "×" is the reference point sequence corresponding to the constellation point data, that is, the ideal data without distortion.

[0109] Figure 4 This is the measured result of amplitude flatness. The signal source inputs a 600MHz bandwidth 16QAM signal. The horizontal axis on the graph is frequency, the range -300M to +300M corresponds to 600MHz bandwidth, and the vertical axis is dB amplitude.

[0110] Figure 5 This is the measured result of phase flatness. The signal source inputs a 600MHz bandwidth 16QAM signal. The horizontal axis on the graph is frequency, the range -300M to +300M corresponds to a 600MHz bandwidth, and the vertical axis is the angle phase.

[0111] The specific implementation scheme of this embodiment can refer to the relevant description in the above embodiment, which will not be repeated here.

[0112] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0113] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0114] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0115] The method, system, device, processor and computer-readable storage medium thereof for realizing flatness measurement and processing of a broadband signal receiver based on orthogonal modulation and demodulation of the present invention are adopted, and synchronous evaluation of amplitude and phase flatness of a broadband signal receiver is realized through one-time measurement. The method has the characteristics of high efficiency and speed, and adopts a single-carrier orthogonal modulation signal for measurement, and does not need point-by-point frequency sweeping, which significantly shortens the time required for flatness measurement and improves measurement efficiency. The method is particularly suitable for flatness evaluation of high resolution and wide frequency band. The method has the characteristics of comprehensiveness and accuracy, and can simultaneously obtain amplitude and flatness information of a broadband signal receiver, provide a more comprehensive performance evaluation, make up for the deficiency that the traditional method can only measure amplitude flatness, and improve the accuracy and reliability of the measurement result. The method has the characteristics of high precision, and effectively reduces the error in the measurement process through the high-precision calibration of a vector signal source and the digital signal processing technology, ensures the high precision of the flatness measurement result, and meets the strict requirements of modern broadband signal receivers for flatness. The method has the characteristics of high automation, and the entire measurement process is automatically completed by a host computer module, from signal generation, reception, demodulation to flatness calculation, and achieves a high degree of automation, reduces manual intervention and operation complexity, and improves the consistency and repeatability of measurement.

[0116] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it is apparent that various modifications and variations may be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be regarded as illustrative rather than restrictive.

Claims

1. A method for measuring the flatness of a broadband signal receiver based on orthogonal modulation and demodulation, characterized in that: The method comprises the following steps: (1) A vector signal source generates and transmits a single-carrier orthogonal modulation signal with the same maximum bandwidth as a wideband signal receiver; (2) transmitting the generated orthogonal modulation signal to a broadband signal receiver via a connecting line; (3) The broadband signal receiver intercepts a digital baseband signal and transmits it to the host computer module; (4) The host computer module demodulates the collected baseband data into orthogonal modulation signals and extracts the constellation point data sequence; (5) According to the known reference signal constellation diagram, reference point determination is performed on the demodulated constellation point data sequence to obtain the corresponding ideal reference point sequence as a reference for error calculation; (6) performing fast Fourier transform on the constellation point data sequence and the reference point sequence respectively to obtain their respective frequency domain expressions; (7) subtracting the frequency domain data of the received signal from the frequency domain data of the reference signal to obtain frequency domain error data in complex form; (8) Apply Gaussian smoothing filtering to the obtained amplitude flatness and phase flatness data to eliminate glitches and noise that occur during the measurement process.

2. The method for measuring the flatness of a broadband signal receiver based on orthogonal modulation and demodulation according to claim 1, characterized in that: The step (2) specifically comprises the following steps: (2.1) Transmitting the generated orthogonal modulated signal to a broadband signal receiver via a connecting line; (2.2) The broadband signal receiver performs RF processing, down-conversion and gain control on the signal, and converts the intermediate frequency analog signal into a digital baseband signal through analog-to-digital conversion.

3. The method for measuring the flatness of a broadband signal receiver based on orthogonal modulation and demodulation according to claim 1, characterized in that: The constellation point data sequence extracted in (4) represents the actual phase and amplitude of the received signal.

4. The method for measuring the flatness of a broadband signal receiver based on orthogonal modulation and demodulation according to claim 1, characterized in that: The step (7) further includes separating the amplitude and phase of the error data, which specifically includes the following steps: (7.1) Take the amplitude and logarithm of the frequency domain error data, calculate the amplitude flatness, and obtain the amplitude flatness characteristic curve of the broadband signal receiver; (7.2) The phase of the frequency domain error data is taken to obtain phase error data, and the phase error is subjected to phase unwrapping processing to obtain the phase flatness characteristic curve of the broadband signal receiver.

5. The method for measuring the flatness of a broadband signal receiver based on orthogonal modulation and demodulation according to claim 4, characterized in that: The amplitude flatness is calculated in step (7.1) as follows: Amplitude flatness is calculated according to the following formula: A dB =10lg[abs(E spec )]; Among them, E spec is the frequency domain error data in complex form.

6. A system for measuring the flatness of a broadband signal receiver based on orthogonal modulation and demodulation for implementing the method of claim 1, characterized in that: The system includes a vector signal source, a broadband signal receiver and a host computer module. The output end of the vector signal source is connected to the broadband signal receiver, and the output end of the broadband signal receiver is connected to the host computer module. The vector signal source is used to generate a single-carrier orthogonal modulation signal with the same maximum bandwidth as the broadband signal receiver, and output the single-carrier text modulation signal to the broadband signal receiver. The broadband signal receiver is used to receive the orthogonal modulation signal sent by the vector signal source, and perform radio frequency processing, down-conversion, gain control and analog-to-digital conversion to convert the received analog signal into a digital baseband signal. The host computer module is used to receive and process the digital baseband signal, and perform signal demodulation, Fourier transform and flatness calculation.

7. The system for measuring the flatness of a broadband signal receiver based on orthogonal modulation and demodulation according to claim 6, characterized in that: The broadband signal receiver comprises: RF mixing and dynamic adjustment unit for RF processing, down-conversion and gain control; An analog-to-digital conversion unit, connected to the radio frequency mixing and dynamic adjustment unit, for performing analog-to-digital conversion; The digital baseband unit is connected to the analog-to-digital conversion unit and is used to convert the received analog signal into a digital baseband signal.

8. A device for realizing flatness measurement of a broadband signal receiver based on orthogonal modulation and demodulation, characterized in that: The device comprises: a processor configured to execute computer-executable instructions; A memory storing one or more computer executable instructions, wherein when the computer executable instructions are executed by the processor, each step of the method for measuring the flatness of a broadband signal receiver based on orthogonal modulation and demodulation as described in any one of claims 1 to 5 is implemented.

9. A processor for realizing flatness measurement of a broadband signal receiver based on orthogonal modulation and demodulation, characterized in that: The processor is configured to execute computer executable instructions. When the computer executable instructions are executed by the processor, the various steps of the method for measuring the flatness of a broadband signal receiver based on orthogonal modulation and demodulation as described in any one of claims 1 to 5 are implemented.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and the computer program can be executed by a processor to implement the various steps of the method for realizing flatness measurement processing of a broadband signal receiver based on orthogonal modulation and demodulation as described in any one of claims 1 to 5.

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