System for realizing superheterodyne signal analysis by supporting 5.5 G communication technology ultra-wide analysis bandwidth demand

Abstract

The invention relates to a system supporting 5.5 G communication technology ultra-wide analysis bandwidth requirements to realize superheterodyne signal analysis, comprising a preceding stage radio frequency signal processing unit for improving the dynamic range of measurable signals and suppressing out-of-band stray of measured signals; the primary frequency conversion unit outputs an intermediate frequency signal subjected to primary frequency conversion to a backward stage; the primary frequency conversion post-processing unit is used for suppressing out-of-band noise of the intermediate-frequency signal subjected to primary frequency conversion and reducing the bandwidth of the intermediate-frequency signal; the secondary frequency conversion unit outputs an intermediate frequency signal subjected to secondary frequency conversion to a backward stage; the intermediate-frequency output unit is used for inhibiting out-of-band noise of the intermediate-frequency signal subjected to secondary frequency conversion and reducing the bandwidth of the intermediate-frequency signal; and the baseband processing unit carries out sampling and data processing on the intermediate frequency signal. By adopting the system for realizing superheterodyne signal analysis by supporting the 5.5 G communication technology ultra-wide analysis bandwidth demand, the frequency and bandwidth of an actually analyzed intermediate frequency signal are reduced, the model selection pressure of a filter and an ADC chip is reduced, and the sampling analysis effect of the intermediate frequency signal is improved.

Description

Technical Field

[0001] The present invention relates to the field of wireless communications, in particular to the field of superheterodyne structures, and specifically refers to a system that supports the ultra-wide analysis bandwidth requirements of 5.5G communication technology and implements superheterodyne signal analysis. Background Art

[0002] As a commonly used receiver structure, the superheterodyne structure has a relatively mature application. Compared with the zero intermediate frequency structure, the superheterodyne structure avoids the influence of DC bias and local oscillator leakage problems. With the continuous development of communication technology, the demand for signal analysis devices in testing work is developing towards higher frequencies, larger bandwidths, and real-time monitoring. With the transition of communication technology from 5G to 6G, the performance requirements of 5.5G communication technology for signal analysis have reached ultra-wide bandwidths of 400MHz bandwidth in the FR1 band and 800MHz bandwidth in the FR2 band. Since the superheterodyne structure design relies on the performance of the intermediate frequency filter and the ADC sampling chip in the low intermediate frequency signal output processing, when facing the design requirements of ultra-wide bandwidth, a series of situations such as increased cost, reduced sampling accuracy, and reduced anti-aliasing capability have emerged. The filter bandwidth and the rate bandwidth of the sampling chip have begun to restrict the development of high-bandwidth superheterodyne structure signal analysis devices. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a system for superheterodyne signal analysis that meets the ultra-wide analysis bandwidth requirements of 5.5G communication technology with low cost, high sampling accuracy and a wide range of applications.

[0004] In order to achieve the above object, the system of the present invention that supports the ultra-wide analysis bandwidth requirement of 5.5G communication technology and implements superheterodyne signal analysis is as follows:

[0005] The main features of the system for superheterodyne signal analysis supporting the ultra-wide analysis bandwidth requirements of 5.5G communication technology are as follows:

[0006] The input end of the front-stage RF signal processing unit is connected to the input ESD protection unit, which is used to improve the dynamic range of the measurable signal and suppress the out-of-band spurious of the measured signal;

[0007] A primary frequency conversion unit, connected to the front-stage radio frequency signal processing unit, for outputting the intermediate frequency signal after the primary frequency conversion to the back-stage;

[0008] A post-processing unit after the primary frequency conversion is connected to the primary frequency conversion unit and is used to suppress out-of-band noise of the intermediate frequency signal after the primary frequency conversion and reduce the bandwidth of the intermediate frequency signal;

[0009] A secondary frequency conversion unit, connected to the primary frequency conversion post-processing unit, for outputting the secondary frequency converted intermediate frequency signal to the subsequent stage;

[0010] An intermediate frequency output unit, connected to the secondary frequency conversion unit, is used to suppress out-of-band noise of the intermediate frequency signal after secondary frequency conversion, reduce the bandwidth of the intermediate frequency signal, and level the broadband signal entering the subsequent baseband processing unit;

[0011] The baseband processing unit is connected to the intermediate frequency output unit and is used for sampling and data processing of the intermediate frequency signal.

[0012] Preferably, the front-stage radio frequency signal processing unit comprises:

[0013] A level adjustment module, connected to the input ESD protection unit, for widening the measurable power range of the measured signal;

[0014] A multi-channel pre-selection filter module, connected to the level adjustment module, for performing segmented filtering on the input RF signal according to a mixing scheme;

[0015] The power adjustment module is connected to the multi-channel pre-selection filter module and is used to adjust the power of the filtered radio frequency signal so that the mixer works in the linear region after the signal enters the mixer.

[0016] Preferably, the primary frequency conversion post-processing unit comprises:

[0017] A first bandpass filter module is connected to the primary frequency conversion unit and is used to perform broadband filtering on the high intermediate frequency signal generated after mixing to suppress out-of-band spurious signals;

[0018] A first intermediate frequency dividing module, connected to the first bandpass filtering module, is used to perform frequency division processing on the filtered high intermediate frequency signal to reduce the bandwidth requirement for processing the intermediate frequency signal;

[0019] A second bandpass filter module, connected to the first intermediate frequency division module, for filtering out-of-band spurious signals of the intermediate frequency signal;

[0020] A first intermediate frequency amplification module, connected to the second bandpass filtering module, for providing gain to the intermediate frequency signal to compensate for the attenuation of the signal caused by mixing and dividing;

[0021] The third bandpass filtering module is connected to the first intermediate frequency amplifying module and is used to further filter out the out-of-band spurious signals of the intermediate frequency signal.

[0022] Preferably, the intermediate frequency output unit comprises:

[0023] A fourth bandpass filter module is connected to the secondary frequency conversion unit and is used to perform broadband filtering on the low intermediate frequency signal generated after mixing to suppress out-of-band spurious signals;

[0024] A second intermediate frequency dividing module, connected to the fourth bandpass filtering module, for dividing the filtered high intermediate frequency signal;

[0025] A fifth bandpass filter module, connected to the secondary frequency conversion unit, for performing broadband filtering on the low intermediate frequency signal generated after mixing to suppress out-of-band spurious signals;

[0026] An intermediate frequency AGC module, connected to the fifth bandpass filter module, for leveling the power output of the broadband signal affected by the mixing filter;

[0027] The RBW filter module is connected to the intermediate frequency AGC module and is used to perform spurious filtering on the intermediate frequency signal and output the filtered intermediate frequency signal to the baseband processing unit.

[0028] Preferably, the baseband processing unit comprises:

[0029] A high-speed broadband ADC module, connected to the RBW filter module, is used to perform analog-to-digital conversion on the intermediate frequency signal;

[0030] A high-performance FPGA or DSP module is connected to the high-speed broadband ADC and is used for high-speed data processing of the converted digital signal.

[0031] Preferably, the front-stage RF signal processing unit of the system performs level adjustment and filtering of image frequency and stray signals on the RF signal, and the output signal enters the primary frequency conversion unit, is mixed with the local oscillator signal generated by the high-purity frequency synthesis local oscillator module, and generates a high intermediate frequency signal, which enters the primary frequency conversion post-processing unit. The processed high intermediate frequency signal enters the secondary frequency conversion unit, is mixed with the local oscillator signal generated by the high-purity frequency synthesis local oscillator module, and generates a low intermediate frequency signal. The low intermediate frequency signal enters the intermediate frequency output unit, and outputs the filtered intermediate frequency signal to the baseband processing unit, and the high-speed broadband ADC performs analog-to-digital conversion on the intermediate frequency signal, and the high-performance FPGA or DSP performs high-speed data processing on the converted digital signal to restore the signal bandwidth to meet the analysis and testing requirements of ultra-wide bandwidth signals.

[0032] The system of the present invention is used to support the ultra-wide analysis bandwidth requirements of 5.5G communication technology to realize superheterodyne signal analysis. By dividing the intermediate frequency signal, the frequency and bandwidth of the intermediate frequency signal actually analyzed are reduced, the selection pressure of the filter and ADC chip is reduced, and the sampling and analysis effect of the intermediate frequency signal is improved. Under the same conditions, after the intermediate frequency signal is divided, the highest frequency is reduced, the actual bandwidth is reduced, and the Nyquist sampling frequency is reduced. The ADC can achieve better sampling of the intermediate frequency signal, improve the signal-to-noise ratio, and reduce the difficulty of anti-aliasing design. At the same time, through data processing and restoration, the actual measured signal bandwidth is the intermediate frequency bandwidth multiplied by the divided frequency multiple, realizing ultra-high bandwidth real-time analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The present invention is a schematic diagram of the structure of a system for realizing superheterodyne signal analysis supporting the ultra-wide analysis bandwidth requirement of 5.5G communication technology.

[0034] Reference numerals:

[0035] 1 Pre-stage RF signal processing unit

[0036] 2 Primary frequency conversion unit

[0037] 3. Primary frequency conversion post-processing unit

[0038] 301 first bandpass filter module

[0039] 302 first intermediate frequency division module

[0040] 303 second bandpass filter module

[0041] 304 first intermediate frequency amplifier module

[0042] 305 third bandpass filter module

[0043] 4 Secondary mixing unit

[0044] 5 IF output unit

[0045] 501 fourth bandpass filter module

[0046] 502 second intermediate frequency crossover module

[0047] 503 Fifth bandpass filter module

[0048] 504 IF AGC module

[0049] 505RBW filter module

[0050] 6Baseband processing unit DETAILED DESCRIPTION

[0051] In order to more clearly describe the technical content of the present invention, further description is given below in conjunction with specific embodiments.

[0052] The system of the present invention supports the ultra-wide analysis bandwidth requirement of 5.5G communication technology and realizes superheterodyne signal analysis, comprising:

[0053] The input end of the front-stage RF signal processing unit is connected to the input ESD protection unit, which is used to improve the dynamic range of the measurable signal and suppress the out-of-band spurious of the measured signal;

[0054] A primary frequency conversion unit, connected to the front-stage radio frequency signal processing unit, for outputting the intermediate frequency signal after the primary frequency conversion to the back-stage;

[0055] A post-processing unit after the primary frequency conversion is connected to the primary frequency conversion unit and is used to suppress out-of-band noise of the intermediate frequency signal after the primary frequency conversion and reduce the bandwidth of the intermediate frequency signal;

[0056] A secondary frequency conversion unit, connected to the primary frequency conversion post-processing unit, for outputting the secondary frequency converted intermediate frequency signal to the subsequent stage;

[0057] An intermediate frequency output unit, connected to the secondary frequency conversion unit, is used to suppress out-of-band noise of the intermediate frequency signal after secondary frequency conversion, reduce the bandwidth of the intermediate frequency signal, and level the broadband signal entering the subsequent baseband processing unit;

[0058] The baseband processing unit is connected to the intermediate frequency output unit and is used for sampling and data processing of the intermediate frequency signal.

[0059] As a preferred embodiment of the present invention, the front-stage radio frequency signal processing unit includes:

[0060] A level adjustment module, connected to the input ESD protection unit, for widening the measurable power range of the measured signal;

[0061] A multi-channel pre-selection filter module, connected to the level adjustment module, for performing segmented filtering on the input RF signal according to a mixing scheme;

[0062] The power adjustment module is connected to the multi-channel pre-selection filter module and is used to adjust the power of the filtered radio frequency signal so that the mixer works in the linear region after the signal enters the mixer.

[0063] As a preferred embodiment of the present invention, the primary frequency conversion post-processing unit comprises:

[0064] A first bandpass filter module is connected to the primary frequency conversion unit and is used to perform broadband filtering on the high intermediate frequency signal generated after mixing to suppress out-of-band spurious signals;

[0065] A first intermediate frequency dividing module, connected to the first bandpass filtering module, is used to perform frequency division processing on the filtered high intermediate frequency signal to reduce the bandwidth requirement for processing the intermediate frequency signal;

[0066] A second bandpass filter module, connected to the first intermediate frequency division module, for filtering out-of-band spurious signals of the intermediate frequency signal;

[0067] A first intermediate frequency amplification module, connected to the second bandpass filtering module, for providing gain to the intermediate frequency signal to compensate for the attenuation of the signal caused by mixing and dividing;

[0068] The third bandpass filtering module is connected to the first intermediate frequency amplifying module and is used to further filter out the out-of-band spurious signals of the intermediate frequency signal.

[0069] As a preferred embodiment of the present invention, the intermediate frequency output unit comprises:

[0070] A fourth bandpass filter module is connected to the secondary frequency conversion unit and is used to perform broadband filtering on the low intermediate frequency signal generated after mixing to suppress out-of-band spurious signals;

[0071] A second intermediate frequency dividing module, connected to the fourth bandpass filtering module, for dividing the filtered high intermediate frequency signal;

[0072] A fifth bandpass filter module, connected to the secondary frequency conversion unit, for performing broadband filtering on the low intermediate frequency signal generated after mixing to suppress out-of-band spurious signals;

[0073] An intermediate frequency AGC module, connected to the fifth bandpass filter module, for leveling the power output of the broadband signal affected by the mixing filter;

[0074] The RBW filter module is connected to the intermediate frequency AGC module and is used to perform spurious filtering on the intermediate frequency signal and output the filtered intermediate frequency signal to the baseband processing unit.

[0075] As a preferred embodiment of the present invention, the baseband processing unit includes:

[0076] A high-speed broadband ADC module, connected to the RBW filter module, is used to perform analog-to-digital conversion on the intermediate frequency signal;

[0077] A high-performance FPGA or DSP module is connected to the high-speed broadband ADC and is used for high-speed data processing of the converted digital signal.

[0078] As a preferred embodiment of the present invention, the front-stage RF signal processing unit of the system performs level adjustment and filters out image frequencies and spurious signals on the RF signal, and the output signal enters a primary frequency conversion unit, is mixed with a local oscillator signal generated by a high-purity frequency synthesis local oscillator module, and generates a high intermediate frequency signal, which enters a primary frequency conversion post-processing unit. The processed high intermediate frequency signal enters a secondary frequency conversion unit, is mixed with a local oscillator signal generated by a high-purity frequency synthesis local oscillator module, and generates a low intermediate frequency signal. The low intermediate frequency signal enters an intermediate frequency output unit, and outputs the filtered intermediate frequency signal to a baseband processing unit. A high-speed broadband ADC performs analog-to-digital conversion on the intermediate frequency signal, and a high-performance FPGA or DSP performs high-speed data processing on the converted digital signal, and restores the signal bandwidth to meet the analysis and testing requirements of ultra-wide bandwidth signals.

[0079] In a specific embodiment of the present invention, a superheterodyne signal analysis device structure is provided to support the ultra-wide analysis bandwidth requirements of 5.5G communication technology, which can meet the test requirements of 200-400MHz bandwidth in FR1 band and 800MHz bandwidth in FR2 band.

[0080] In view of the high analysis bandwidth requirements of the tests of each frequency band of 5.5G communication technology, the present invention provides a superheterodyne signal analysis device structure that supports the ultra-wide analysis bandwidth requirements of 5.5G communication technology, and the system includes input ESD protection, a front-stage RF signal processing unit, a primary frequency conversion unit, a primary frequency conversion post-processing unit, a secondary frequency conversion unit, an intermediate frequency output unit, and a baseband processing unit. The structure includes a front-stage RF signal processing unit, a primary frequency conversion unit, a primary frequency conversion post-processing unit, a secondary frequency conversion unit, an intermediate frequency output unit, and a baseband processing unit connected in sequence.

[0081] The front-stage RF signal processing unit 1 includes an input level adjustment module, a multi-channel pre-selection filter module, and a power adjustment module. The unit is configured to improve the dynamic range of the measurable signal, suppress the out-of-band spurious of the measured signal, and ensure that the RF signal power entering the rear-stage frequency conversion unit enables the mixer to operate in the linear region.

[0082] The primary frequency conversion unit 2 includes a high-purity frequency synthesis local oscillator module and a broadband mixing circuit. The unit is configured to output the intermediate frequency signal after the primary frequency conversion to the subsequent stage.

[0083] The post-processing unit 3 of the primary frequency conversion includes a bandpass filter module, a frequency division filter module, and a power regulation module. The unit is configured to suppress the out-of-band noise of the intermediate frequency signal after the primary frequency conversion, reduce the bandwidth of the intermediate frequency signal, and ensure that the power of the intermediate frequency signal entering the post-frequency conversion unit enables the mixer to operate in the linear region.

[0084] The secondary frequency conversion unit 4 includes a high-purity frequency synthesis local oscillator module and a broadband mixing circuit. The unit is configured to output the secondary-converted intermediate frequency signal to the subsequent stage.

[0085] The intermediate frequency output unit 5 includes a bandpass filter module, a frequency division module, an intermediate frequency AGC module, and a bandpass filter module. The unit is configured to suppress the out-of-band noise of the intermediate frequency signal after secondary frequency conversion, reduce the bandwidth of the intermediate frequency signal, and level the broadband signal level entering the subsequent baseband processing unit.

[0086] The baseband processing unit 6 includes a high-speed broadband ADC module and a high-performance FPGA / DSP data processing module. The unit is configured for sampling and data processing of intermediate frequency signals.

[0087] The front-stage radio frequency signal processing unit comprises:

[0088] The level adjustment module is connected to the input ESD protection and is used to broaden the measurable power range of the measured signal.

[0089] The multi-channel pre-selection filter module is connected to the level adjustment module and is used to perform segmented filtering on the input radio frequency signal according to the mixing scheme to suppress image frequency and out-of-band interference.

[0090] The power adjustment module is connected to the multi-channel pre-selection filter module and is used to adjust the power of the filtered radio frequency signal so that the mixer works in the linear region after the signal enters the mixer to ensure the mixing quality.

[0091] The primary frequency conversion post-processing unit comprises:

[0092] The first bandpass filter module is connected to the primary frequency conversion unit and is used to perform broadband filtering on the high intermediate frequency signal generated after mixing to suppress out-of-band spurious signals.

[0093] The first intermediate frequency dividing module is connected to the first bandpass filtering module and is used to perform frequency division processing on the filtered high intermediate frequency signal to reduce the bandwidth requirement for processing the intermediate frequency signal.

[0094] The second bandpass filtering module is connected to the first intermediate frequency dividing module and is used to filter out the out-of-band spurious of the intermediate frequency signal.

[0095] The first intermediate frequency amplification module is connected to the second bandpass filtering module and is used to provide gain for the intermediate frequency signal to compensate for the attenuation of the signal caused by mixing and dividing.

[0096] The third bandpass filtering module is connected to the first intermediate frequency amplifying module and is used to further filter out the out-of-band spurious signals of the intermediate frequency signal.

[0097] This preferred method reduces the out-of-band spurious of the high-mid frequency signal as much as possible by filtering-frequency division-filtering-amplification-filtering, and prevents the out-of-band spurious from introducing higher-power noise signals into the later stage as the amplification of the amplification module improves the signal-to-noise ratio of the high-mid frequency signal, and ensures that the high-mid frequency signal has sufficient power to participate in the subsequent frequency conversion. At the same time, the frequency division module can select the frequency division multiple according to the actual situation, and flexibly perform intermediate frequency processing through digital control frequency division or switch gating.

[0098] The intermediate frequency output unit comprises:

[0099] The fourth bandpass filter module is connected to the secondary frequency conversion unit and is used to perform broadband filtering on the low intermediate frequency signal generated after mixing to suppress out-of-band spurious signals.

[0100] The second intermediate frequency dividing module is connected to the fourth bandpass filtering module and is used to perform frequency division processing on the filtered high intermediate frequency signal to reduce the bandwidth requirement for processing the intermediate frequency signal.

[0101] The fifth bandpass filter module is connected to the secondary frequency conversion unit and is used to perform broadband filtering on the low intermediate frequency signal generated after mixing to suppress out-of-band spurious signals.

[0102] The intermediate frequency AGC module is connected to the fifth bandpass filter module and is used to level the power output of the broadband signal affected by the mixing filter.

[0103] The RBW filter module is connected to the intermediate frequency AGC module and is used to perform spurious filtering on the intermediate frequency signal and output the filtered intermediate frequency signal to the subsequent stage for baseband processing.

[0104] This preferred method reduces the out-of-band spurious of the high-mid frequency signal as much as possible by filtering-frequency division-filtering-amplification-filtering, and prevents the out-of-band spurious from introducing higher-power noise signals into the later stage as the amplification of the amplification module improves the signal-to-noise ratio of the high-mid frequency signal, and levels the power output of the broadband signal affected by the mixing filter. At the same time, the frequency division module can select the frequency division multiple according to the actual situation, and flexibly perform intermediate frequency processing through digital control frequency division or switch gating.

[0105] The baseband processing unit comprises:

[0106] The high-speed broadband ADC is connected to the RBW filter module and is used for performing analog-to-digital conversion on the intermediate frequency signal.

[0107] The high-performance FPGA / DSP is connected to the high-speed broadband ADC and is used for performing high-speed data processing on the converted digital signal.

[0108] The specific working method of the invention is as follows:

[0109] The RF signal is processed by the front-stage RF signal processing unit 1 to adjust the signal level and filter out the image frequency and stray signals. The output signal enters the primary frequency conversion unit 2, and is mixed with the local oscillator signal generated by the high-purity frequency synthesis local oscillator module to generate a high-intermediate frequency signal. The high-intermediate frequency signal enters the primary frequency conversion post-processing unit 3, and passes through the first bandpass filter module 301 in sequence to perform broadband filtering on the high-intermediate frequency signal generated after mixing to suppress out-of-band spurious signals; the first intermediate frequency division module 302 divides the filtered high-intermediate frequency signal to reduce the bandwidth required for processing the intermediate frequency signal; the second bandpass filter module 303 filters out-of-band spurious signals of the intermediate frequency signal; the first intermediate frequency amplification module 304 provides gain to the intermediate frequency signal to compensate for the attenuation of the signal caused by mixing and division; the third bandpass filter module 305 further filters out-of-band spurious signals of the intermediate frequency signal to improve the signal-to-noise ratio of the intermediate frequency signal. The processed high-intermediate frequency signal enters the secondary frequency conversion unit 4, and is mixed with the local oscillator signal generated by the high-purity frequency synthesis local oscillator module to generate a low intermediate frequency signal. The low intermediate frequency signal enters the intermediate frequency output unit 5, and passes through the fourth bandpass filter module 501 in sequence, and performs broadband filtering on the low intermediate frequency signal generated after mixing to suppress out-band spurious signals; the second intermediate frequency division module 502 performs frequency division processing on the high intermediate frequency signal after filtering, and further reduces the bandwidth requirement for processing the intermediate frequency signal; the fifth bandpass filter module 503 performs broadband filtering on the low intermediate frequency signal generated after mixing to suppress out-band spurious signals; the intermediate frequency AGC module 504 levels the power output of the broadband signal affected by the mixing filter; the RBW filter module 505 performs spurious filtering on the intermediate frequency signal, and outputs the filtered intermediate frequency signal to the baseband processing unit 6, and the high-speed broadband ADC performs analog-to-digital conversion on the intermediate frequency signal, and the high-performance FPGA / DSP performs high-speed data processing on the converted digital signal to restore the signal bandwidth, thereby meeting the analysis and testing requirements of ultra-wide bandwidth signals.

[0110] The front-stage radio frequency signal processing module of the present invention is responsible for the pre-selection filtering and gain adjustment of the radio frequency signal to ensure the linearity of the frequency conversion process; the primary frequency conversion module includes a high-purity frequency synthesis local oscillator module and a mixing module, which are responsible for generating an intermediate frequency signal; the primary frequency conversion post-processing unit includes an intermediate frequency filtering module, an intermediate frequency division module and an intermediate frequency gain adjustment module, which are responsible for suppressing the out-of-band interference of the intermediate frequency signal, reducing the measurement bandwidth requirement of the intermediate frequency signal, and ensuring that the secondary mixing is in a linear working state; the secondary frequency conversion module includes a high-purity frequency synthesis local oscillator module and a mixing module, which are responsible for outputting the intermediate frequency signal to be processed and output to the baseband; the intermediate frequency output unit includes an intermediate frequency filtering module, an intermediate frequency division module, an RBW filtering module and an intermediate frequency gain adjustment module, which are responsible for suppressing the out-of-band interference of the intermediate frequency signal, reducing the measurement bandwidth requirement of the intermediate frequency signal, and leveling the power output of the broadband signal. The baseband processing unit is responsible for high-speed broadband AD conversion and data acquisition processing, achieving the analysis bandwidth of 200-400MHz in the FR1 band and 800MHz in the FR2 band required by 5.5G communication technology, and providing support for broadband real-time analysis of the implementation of related technologies of 5.5G communication technology.

[0111] The structure of the present invention suppresses image and stray noise through the pre-stage input signal processing, adopts the high-purity frequency synthesis local oscillator unit to generate the local oscillator to participate in the frequency conversion, and ensures the quality of the intermediate frequency signal. Through the frequency division module of the frequency conversion post-processing unit, the broadband high-intermediate frequency signal is divided into a lower frequency with a lower bandwidth, so that the ultra-wideband intermediate frequency signal can pass through the RBW filter, and the actual analysis bandwidth is expanded to the RBW filter bandwidth multiplied by the frequency division multiple, meeting the test requirements of the ultra-wide analysis bandwidth of 5.5G communication technology. The intermediate frequency signal after the RBW filter can participate in ADC sampling at a lower frequency and bandwidth, reduce the Nyquist sampling frequency, and improve the signal-to-noise ratio.

[0112] The specific implementation scheme of this embodiment can refer to the relevant description in the above embodiment, which will not be repeated here.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] The system of the present invention is used to support the ultra-wide analysis bandwidth requirements of 5.5G communication technology to realize superheterodyne signal analysis. By dividing the intermediate frequency signal, the frequency and bandwidth of the intermediate frequency signal actually analyzed are reduced, the selection pressure of the filter and ADC chip is reduced, and the sampling and analysis effect of the intermediate frequency signal is improved. Under the same conditions, after the intermediate frequency signal is divided, the highest frequency is reduced, the actual bandwidth is reduced, and the Nyquist sampling frequency is reduced. The ADC can achieve better sampling of the intermediate frequency signal, improve the signal-to-noise ratio, and reduce the difficulty of anti-aliasing design. At the same time, through data processing and restoration, the actual measured signal bandwidth is the intermediate frequency bandwidth multiplied by the divided frequency multiple, realizing ultra-high bandwidth real-time analysis.

[0117] 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 system that supports the ultra-wide analysis bandwidth requirements of 5.5G communication technology to implement superheterodyne signal analysis, characterized in that: The system comprises: The input end of the front-stage RF signal processing unit is connected to the input ESD protection unit, which is used to improve the dynamic range of the measurable signal and suppress the out-of-band spurious of the measured signal; A primary frequency conversion unit, connected to the front-stage radio frequency signal processing unit, for outputting the intermediate frequency signal after the primary frequency conversion to the back-stage; A post-processing unit after the primary frequency conversion is connected to the primary frequency conversion unit and is used to suppress out-of-band noise of the intermediate frequency signal after the primary frequency conversion and reduce the bandwidth of the intermediate frequency signal; A secondary frequency conversion unit, connected to the primary frequency conversion post-processing unit, for outputting the secondary frequency converted intermediate frequency signal to the subsequent stage; An intermediate frequency output unit, connected to the secondary frequency conversion unit, is used to suppress out-of-band noise of the intermediate frequency signal after secondary frequency conversion, reduce the bandwidth of the intermediate frequency signal, and level the broadband signal entering the subsequent baseband processing unit; The baseband processing unit is connected to the intermediate frequency output unit and is used for sampling and data processing of the intermediate frequency signal.

2. The system for implementing superheterodyne signal analysis supporting the ultra-wide analysis bandwidth requirement of 5.5G communication technology according to claim 1, characterized in that: The front-stage radio frequency signal processing unit includes: A level adjustment module, connected to the input ESD protection unit, for widening the measurable power range of the measured signal; A multi-channel pre-selection filter module, connected to the level adjustment module, for performing segmented filtering on the input RF signal according to a mixing scheme; The power adjustment module is connected to the multi-channel pre-selection filter module and is used to adjust the power of the filtered radio frequency signal so that the mixer works in the linear region after the signal enters the mixer.

3. The system for implementing superheterodyne signal analysis supporting the ultra-wide analysis bandwidth requirement of 5.5G communication technology according to claim 1, characterized in that: The primary frequency conversion post-processing unit comprises: A first bandpass filter module is connected to the primary frequency conversion unit and is used to perform broadband filtering on the high intermediate frequency signal generated after mixing to suppress out-of-band spurious signals; A first intermediate frequency dividing module, connected to the first bandpass filtering module, is used to perform frequency division processing on the filtered high intermediate frequency signal to reduce the bandwidth requirement for processing the intermediate frequency signal; A second bandpass filter module, connected to the first intermediate frequency division module, for filtering out-of-band spurious signals of the intermediate frequency signal; A first intermediate frequency amplification module, connected to the second bandpass filtering module, for providing gain to the intermediate frequency signal to compensate for the attenuation of the signal caused by mixing and dividing; The third bandpass filtering module is connected to the first intermediate frequency amplifying module and is used to further filter out the out-of-band spurious signals of the intermediate frequency signal.

4. The system for implementing superheterodyne signal analysis supporting the ultra-wide analysis bandwidth requirement of 5.5G communication technology according to claim 1, characterized in that: The intermediate frequency output unit comprises: A fourth bandpass filter module is connected to the secondary frequency conversion unit and is used to perform broadband filtering on the low intermediate frequency signal generated after mixing to suppress out-of-band spurious signals; A second intermediate frequency dividing module, connected to the fourth bandpass filtering module, for dividing the filtered high intermediate frequency signal; A fifth bandpass filter module, connected to the secondary frequency conversion unit, for performing broadband filtering on the low intermediate frequency signal generated after mixing to suppress out-of-band spurious signals; An intermediate frequency AGC module, connected to the fifth bandpass filter module, for leveling the power output of the broadband signal affected by the mixing filter; The RBW filter module is connected to the intermediate frequency AGC module and is used to perform spurious filtering on the intermediate frequency signal and output the filtered intermediate frequency signal to the baseband processing unit.

5. The system for implementing superheterodyne signal analysis supporting the ultra-wide analysis bandwidth requirement of 5.5G communication technology according to claim 1, characterized in that: The baseband processing unit comprises: A high-speed broadband ADC module, connected to the RBW filter module, is used to perform analog-to-digital conversion on the intermediate frequency signal; A high-performance FPGA or DSP module is connected to the high-speed broadband ADC and is used for high-speed data processing of the converted digital signal.

6. The system for implementing superheterodyne signal analysis supporting the ultra-wide analysis bandwidth requirement of 5.5G communication technology according to claim 1, characterized in that: The front-stage radio frequency signal processing unit of the system adjusts the level of the radio frequency signal and filters out the image frequency and stray signals. The output signal enters the primary frequency conversion unit, is mixed with the local oscillator signal generated by the high-purity frequency synthesis local oscillator module, generates a high intermediate frequency signal, and enters the primary frequency conversion post-processing unit. The processed high intermediate frequency signal enters the secondary frequency conversion unit, is mixed with the local oscillator signal generated by the high-purity frequency synthesis local oscillator module, generates a low intermediate frequency signal, and the low intermediate frequency signal enters the intermediate frequency output unit, and outputs the filtered intermediate frequency signal to the baseband processing unit. The high-speed broadband ADC performs analog-to-digital conversion on the intermediate frequency signal, and the high-performance FPGA or DSP performs high-speed data processing on the converted digital signal to restore the signal bandwidth to meet the analysis and testing requirements of ultra-wide bandwidth signals.

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