CN113258942A - Demodulation device supporting all-system broadband communication signals - Google Patents
Demodulation device supporting all-system broadband communication signals Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0028—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at baseband stage
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/06—Demodulator circuits; Receiver circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/08—Amplitude regulation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
- H04M11/062—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data
Abstract
The invention relates to a demodulation device supporting full-standard broadband communication signals, which comprises an amplitude limiting module, a level switching unit, a first multi-standard preselection filtering unit, a first variable mixing unit, a second multi-standard preselection filtering unit, a second variable mixing unit, a third multi-standard preselection filtering unit and a baseband data acquisition unit, wherein the units are connected in sequence. The demodulation device supporting the full-standard broadband communication signals is adopted, the limiting module carries out maximum level amplitude limitation, the level switching unit carries out level amplification or attenuation on the communication signals after amplitude limiting, the full-standard broadband communication signals eliminate broadband signal impurities through the first multi-standard preselection filtering unit, the first variable mixing unit realizes high mixing of the full-standard communication signals to generate full-standard variable high-intermediate frequency communication signals, the second variable mixing unit generates full-standard variable low-intermediate frequency communication signals, and high-speed data acquisition processing is completed on the full-standard variable low-intermediate frequency communication signals through the baseband data acquisition unit.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to a demodulation device supporting full-standard broadband communication signals.
Background
With the continuous promotion and development of broadband wireless communication technology, it is a technical difficulty in the field of broadband wireless communication testing at present to support communication performance demodulation under the condition that full-system broadband communication signals such as 5G NR, LTE, WCDMA, TD-SCDMA and GSM exist in parallel. In the traditional demodulation mode, a broadband communication signal generates a fixed intermediate frequency signal after being subjected to down-conversion by a receiving channel, and baseband data sampling processing is carried out to complete demodulation of the broadband communication signal, but key indexes such as carrier frequencies, subframe ratios, coding modes and the like of broadband communication signals of different systems are different, so that the technology cannot realize demodulation of the broadband communication signal of the whole system, and cannot realize parallel demodulation processing of the broadband signals of different systems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a demodulation device which has the advantages of small error, less impurities and wider application range and supports full-system broadband communication signals.
In order to achieve the above object, the demodulation apparatus supporting the full-system wideband communication signal according to the present invention comprises:
the demodulation device supporting the full-standard broadband communication signals is mainly characterized in that the system comprises an amplitude limiting module, a level switching unit, a first multi-standard preselection filtering unit, a first variable frequency mixing unit, a second multi-standard preselection filtering unit, a second variable frequency mixing unit, a third multi-standard preselection filtering unit and a baseband data acquisition unit, wherein the amplitude limiting module, the level switching unit, the first multi-standard preselection filtering unit, the first variable frequency mixing unit, the second multi-standard preselection filtering unit, the second variable frequency mixing unit, the third multi-standard preselection filtering unit and the baseband data acquisition unit are sequentially connected;
the limiting module limits the maximum level amplitude, the level switching unit amplifies or attenuates the level of the communication signal after amplitude limiting, the full-system broadband communication signal after level adjustment eliminates the out-of-band spurious, harmonic and mirror frequency of the broadband signal through the first multi-system preselection filtering unit, the full-system communication signal is subjected to high frequency mixing through the first variable frequency mixing unit to output signals to generate full-system variable high-intermediate frequency communication signals, the out-of-band spurious interference is eliminated through the second multi-system preselection filtering unit, the full-system variable low-intermediate frequency communication signals are generated through the second variable frequency mixing unit, the out-of-band spurious interference is eliminated through the third multi-system preselection filtering unit, and high-speed data acquisition processing is completed on the full-system variable low-intermediate frequency communication signals through the baseband data acquisition unit.
Preferably, the level switching unit includes a first path switching unit, a level attenuation module and a low noise power amplification module, the first path switching unit, the level attenuation module and the low noise power amplification module are sequentially connected, the first path switching unit is configured to perform path switching on a full-standard broadband communication signal to implement level amplification or attenuation, the level attenuation module is configured to perform level attenuation on the communication signal to meet a path level working requirement in a linear state, and the low noise power amplification module is configured to perform power amplification on a low power communication signal.
Preferably, the first multi-system preselection filtering unit includes a first broadband matching circuit, a second path switching unit, a band-pass filter unit and a second broadband matching circuit, the first broadband matching circuit, the second path switching unit, the band-pass filter unit and the second broadband matching circuit are sequentially connected, the first broadband matching circuit is used for performing port impedance matching and suppressing out-of-band self-excitation on input broadband communication signals, the second path switching unit is used for performing path switching on different-system broadband communication signals, the band-pass filter unit is used for performing in-band filtering on different-system broadband communication signals and suppressing out-of-band spurious, harmonic and image frequencies, and the second broadband matching circuit is used for performing impedance matching and suppressing self-excitation on filtered broadband communication signals.
Preferably, the first variable frequency mixing unit includes a high-frequency broadband frequency mixing circuit and a first high-purity frequency synthesized local oscillator module, an input end of the high-frequency broadband frequency mixing circuit is connected with an output end of the first multi-system preselection filtering unit and an output end of the first high-purity frequency synthesized local oscillator module, an output end of the high-frequency broadband frequency mixing circuit is connected with an input end of the second multi-system preselection filtering unit, the high-frequency broadband frequency mixing circuit is configured to perform high-frequency mixing on different-system broadband communication signals to generate full-system variable high-intermediate-frequency communication signals, and the first high-purity frequency synthesized local oscillator module is configured to provide high-phase noise local oscillators for performing broadband high-frequency mixing on the different-system broadband communication signals.
Preferably, the second multi-system preselection filtering unit includes a third broadband matching circuit, a third path switching unit, a band-pass filter unit, and a fourth broadband matching circuit, the third path switching unit, the band-pass filter unit, and the fourth broadband matching circuit are sequentially connected, the third broadband matching circuit is configured to perform port impedance matching and suppress out-of-band self-excitation on the full-system variable high-medium frequency communication signal, the third path switching unit is configured to perform path switching on the full-system variable high-medium frequency communication signal, the band-pass filter unit is configured to perform in-band filtering on the full-system variable high-medium frequency communication signal and suppress out-of-band spurious emission, and the fourth broadband matching circuit is configured to perform impedance matching and suppress out-of-band self-excitation on the filtered full-system variable high-medium frequency communication signal.
Preferably, the second variable frequency mixing unit includes a low-frequency broadband frequency mixing circuit and a second high-purity frequency synthesized local oscillator module, an input end of the low-frequency broadband frequency mixing circuit is connected with an output end of the second multi-system preselection filtering unit and an output end of the second high-purity frequency synthesized local oscillator module, an output end of the low-frequency broadband frequency mixing circuit is connected with an input end of the third multi-system preselection filtering unit, the low-frequency broadband frequency mixing circuit is configured to perform low frequency mixing on the full-system variable high-intermediate frequency communication signal to generate a full-system variable low-intermediate frequency communication signal, and the second high-purity frequency synthesized local oscillator module is configured to provide a high-phase-noise local oscillator for the full-system variable high-intermediate frequency communication signal to perform broadband low frequency mixing.
Preferably, the third multi-system preselection filtering unit includes a fifth broadband matching circuit, a fourth path switching unit, a band-pass filter unit, and a sixth broadband matching circuit, the fifth broadband matching circuit, the fourth path switching unit, the band-pass filter unit, and the sixth broadband matching circuit are sequentially connected, the fifth broadband matching circuit is configured to perform port impedance matching and self-excitation out-of-band suppression on the full-system variable low-intermediate frequency communication signal, the fourth path switching unit is configured to perform path switching on the full-system variable low-intermediate frequency communication signal, the band-pass filter unit is configured to perform in-band filtering on the full-system variable low-intermediate frequency communication signal and suppress stray out-of-band, and the sixth broadband matching circuit is configured to perform impedance matching and self-excitation out-of-band suppression on the filtered full-system variable low-intermediate frequency communication signal.
Preferably, the baseband data acquisition unit comprises a high-speed ADC unit, a high-performance FPGA and a DSP processing unit, the high-speed ADC unit, the high-performance FPGA and the DSP processing unit are sequentially connected, the high-speed ADC unit is configured to perform analog-to-digital conversion on the matched full-format variable low-intermediate frequency communication signal, and the high-performance FPGA and the DSP processing unit are configured to perform high-speed data processing on the converted digital signal to complete demodulation of a corresponding format broadband signal.
The demodulation device supporting the full-standard broadband communication signals comprises an amplitude limiting module, a level switching unit, a first multi-standard preselection filtering unit, a first variable mixing unit, a second multi-standard preselection filtering unit, a second variable mixing unit, a third multi-standard preselection filtering unit and a baseband data acquisition unit; the amplitude limiting module inhibits the maximum level amplitude of the full-standard broadband communication signal and protects the demodulation device; the level switching unit amplifies or attenuates the broadband communication signal power to realize the input of the optimal power level; the first multi-system preselection filtering unit eliminates out-of-band spurious, harmonic and mirror frequency of full-system broadband signals; the first variable frequency mixing unit realizes high frequency mixing of the full-system communication signals and generates full-system variable high-medium frequency communication signals; the second multi-system preselection filtering unit eliminates the out-of-band spurious interference of the full-system high-medium frequency communication signal; the second variable frequency mixing unit realizes frequency mixing of the full-system variable high-intermediate frequency communication signals and generates full-system variable low-intermediate frequency communication signals; the third multi-system preselection filtering unit eliminates the out-of-band spurious interference of the full-system variable low-intermediate frequency communication signal; the baseband data acquisition module realizes high-speed AD conversion and data acquisition processing of the full-standard variable low-intermediate frequency communication signals and meets the demodulation requirements of the full-standard broadband communication signals.
Drawings
Fig. 1 is a circuit configuration diagram of a demodulation apparatus supporting a full-system wideband communication signal according to the present invention.
Fig. 2 is a schematic diagram of the demodulation result of the input 5G NR communication signal of the demodulation apparatus supporting the full-system wideband communication signal according to the present invention.
Reference numerals:
1 amplitude limiting module
2 level switching unit
201 first path switching unit
3 first multi-system preselection filter unit
301 second path switching unit
4 first variable mixer cell
401 high frequency broadband mixing circuit
5 second multi-system preselection filter unit
501 third path switching unit
6 second variable mixer cell
601 low frequency broadband mixing circuit
7 third multi-system preselection filter unit
701 fourth path switching unit
8 baseband data acquisition unit
Detailed Description
In order to more clearly describe the technical contents of the present invention, the following further description is given in conjunction with specific embodiments.
The demodulation device supporting the full-standard broadband communication signal comprises an amplitude limiting module, a level switching unit, a first multi-standard preselection filtering unit, a first variable frequency mixing unit, a second multi-standard preselection filtering unit, a second variable frequency mixing unit, a third multi-standard preselection filtering unit and a baseband data acquisition unit, wherein the amplitude limiting module, the level switching unit, the first multi-standard preselection filtering unit, the first variable frequency mixing unit, the second multi-standard preselection filtering unit, the second variable frequency mixing unit, the third multi-standard preselection filtering unit and the baseband data acquisition unit are sequentially connected;
the limiting module limits the maximum level amplitude, the level switching unit amplifies or attenuates the level of the communication signal after amplitude limiting, the full-system broadband communication signal after level adjustment eliminates the out-of-band spurious, harmonic and mirror frequency of the broadband signal through the first multi-system preselection filtering unit, the full-system communication signal is subjected to high frequency mixing through the first variable frequency mixing unit to output signals to generate full-system variable high-intermediate frequency communication signals, the out-of-band spurious interference is eliminated through the second multi-system preselection filtering unit, the full-system variable low-intermediate frequency communication signals are generated through the second variable frequency mixing unit, the out-of-band spurious interference is eliminated through the third multi-system preselection filtering unit, and high-speed data acquisition processing is completed on the full-system variable low-intermediate frequency communication signals through the baseband data acquisition unit.
As a preferred embodiment of the present invention, the level switching unit includes a first path switching unit, a level attenuation module, and a low noise power amplification module, the first path switching unit, the level attenuation module, and the low noise power amplification module are sequentially connected, the first path switching unit is configured to perform path switching on a full-standard wideband communication signal to implement level amplification or attenuation, the level attenuation module is configured to perform level attenuation on the communication signal to meet a path level operation requirement in a linear state, and the low noise power amplification module is configured to perform power amplification on a low power communication signal.
As a preferred embodiment of the present invention, the first multi-system pre-selection filtering unit includes a first broadband matching circuit, a second path switching unit, a band-pass filtering unit and a second broadband matching circuit, the first broadband matching circuit, the second path switching unit, the band-pass filter unit and the second broadband matching circuit are connected in sequence, the first broadband matching circuit is used for carrying out port impedance matching on an input broadband communication signal and restraining out-of-band self-excitation, the second path switching unit is used for switching paths of broadband communication signals of different systems, the band-pass filter unit is used for carrying out in-band filtering on broadband communication signals of different systems, inhibiting out-of-band spurious, harmonic and image frequencies, the second broadband matching circuit is used for carrying out impedance matching on the filtered broadband communication signals and restraining out-of-band self-excitation.
As a preferred embodiment of the present invention, the first variable frequency mixing unit includes a high-frequency broadband frequency mixing circuit and a first high-purity frequency synthesized local oscillator module, an input end of the high-frequency broadband frequency mixing circuit is connected to an output end of the first multi-system preselection filtering unit and an output end of the first high-purity frequency synthesized local oscillator module, an output end of the high-frequency broadband frequency mixing circuit is connected to an input end of the second multi-system preselection filtering unit, the high-frequency broadband frequency mixing circuit is configured to perform high-frequency mixing on different-system broadband communication signals to generate a full-system variable high-intermediate-frequency communication signal, and the first high-purity frequency synthesized local oscillator module is configured to provide a high-phase noise local oscillator for the different-system broadband communication signals to perform broadband high-frequency mixing.
As a preferred embodiment of the present invention, the second multi-system pre-selection filtering unit includes a third broadband matching circuit, a third path switching unit, a band-pass filtering unit and a fourth broadband matching circuit, the third broadband matching circuit, the third path switching unit, the band-pass filter unit and the fourth broadband matching circuit are connected in sequence, the third broadband matching circuit is used for carrying out port impedance matching on the full-system variable high-intermediate frequency communication signals and inhibiting out-of-band self-excitation, the third path switching unit is used for switching paths of the full-system variable high-medium frequency communication signals, the band-pass filter unit is used for carrying out in-band filtering on the full-system variable high-medium frequency communication signals and inhibiting out-of-band spurious, the fourth broadband matching circuit is used for carrying out impedance matching on the filtered full-system variable high-medium frequency communication signal and inhibiting out-of-band self-excitation.
As a preferred embodiment of the present invention, the second variable frequency mixing unit includes a low-frequency broadband frequency mixing circuit and a second high-purity frequency synthesized local oscillator module, an input end of the low-frequency broadband frequency mixing circuit is connected to an output end of the second multi-system preselection filtering unit and an output end of the second high-purity frequency synthesized local oscillator module, an output end of the low-frequency broadband frequency mixing circuit is connected to an input end of the third multi-system preselection filtering unit, the low-frequency broadband frequency mixing circuit is configured to perform low frequency mixing on the full-system variable high-intermediate frequency communication signal to generate a full-system variable low-intermediate frequency communication signal, and the second high-purity frequency synthesized local oscillator module is configured to provide high phase noise to the full-system variable high-intermediate frequency communication signal to perform broadband low frequency mixing.
As a preferred embodiment of the present invention, the third multi-system pre-selection filtering unit includes a fifth broadband matching circuit, a fourth channel switching unit, a band-pass filtering unit and a sixth broadband matching circuit, the fifth broadband matching circuit, the fourth path switching unit, the band-pass filter unit and the sixth broadband matching circuit are connected in sequence, the fifth broadband matching circuit is used for carrying out port impedance matching on the full-system variable low-intermediate frequency communication signals and inhibiting out-of-band self-excitation, the fourth path switching unit is used for switching paths of the full-system variable low-intermediate frequency communication signals, the band-pass filter unit is used for carrying out in-band filtering on the full-system variable low-intermediate frequency communication signals and inhibiting out-of-band spurious, and the sixth broadband matching circuit is used for performing impedance matching on the filtered full-system variable low-intermediate frequency communication signal and inhibiting out-of-band self-excitation.
As a preferred embodiment of the present invention, the baseband data acquisition unit includes a high-speed ADC unit, a high-performance FPGA, and a DSP processing unit, the high-speed ADC unit, the high-performance FPGA, and the DSP processing unit are sequentially connected, the high-speed ADC unit is configured to perform analog-to-digital conversion on the matched full-format variable low-intermediate frequency communication signal, and the high-performance FPGA and the DSP processing unit are configured to perform high-speed data processing on the converted digital signal to complete demodulation of the corresponding format broadband signal.
In the specific implementation mode of the invention, a demodulation device supporting full-standard broadband communication signals is provided, the full-standard broadband communication signals are subjected to maximum level amplitude limitation through an amplitude limiting module, the communication signals after amplitude limitation enter a level switching unit to be subjected to level amplification or attenuation, the full-standard broadband communication signals after level adjustment are subjected to elimination of out-of-band spurious, harmonic and mirror frequency of the broadband signals through a first multi-standard preselection filtering unit, the output signals are subjected to high frequency mixing through a first variable frequency mixing unit to generate full-standard variable high-intermediate frequency communication signals, the signals enter a second multi-standard preselection filtering unit to eliminate out-of-band spurious interference and then enter a second variable frequency mixing unit to generate full-standard variable low-intermediate frequency communication signals, the signals enter a third multi-standard preselection filtering unit to eliminate out-of-band spurious interference, and finally the full-standard variable low-intermediate frequency communication signals are subjected to high-speed data acquisition processing through a baseband data acquisition unit, the device meets the requirements of all-standard broadband communication signal demodulation.
Aiming at the test requirements of full-standard broadband communication signal demodulation, the demodulation of full-standard broadband communication signals is supported by level adjustment, multi-standard preselection filtering, variable high frequency mixing, variable low frequency mixing and baseband data acquisition processing, as shown in fig. 1, a demodulation device supporting full-standard broadband communication signals comprises an amplitude limiting module 1, a level switching unit 2, a first multi-standard preselection filtering unit 3, a first variable frequency mixing unit 4, a second multi-standard preselection filtering unit 5, a second variable frequency mixing unit 6, a third multi-standard preselection filtering unit 7 and a baseband data acquisition unit 8;
the amplitude limiting module 1 is configured to perform maximum level amplitude limitation on the input full-standard broadband communication signal and protect the channel safety of the demodulation device;
a level switching unit 2 including a first path switching unit 201, a level attenuating module, and a low noise power amplifying module;
the first path switching unit 201 is configured to perform path switching on a full-system broadband communication signal to implement level amplification or attenuation;
the level attenuation module is configured for carrying out level attenuation on the communication signal and meeting the working requirement of the channel level in a linear state;
a low noise power amplification module configured to power amplify a low power communication signal;
the first multi-system preselection filtering unit 3 comprises a first broadband matching circuit, a second path switching unit 301, a band-pass filter unit and a second broadband matching circuit;
a first wideband matching circuit configured to perform port impedance matching and suppress out-of-band self-excitation on an input wideband communication signal;
a second path switching unit 301 configured to switch paths of the wideband communication signals of different systems;
the band-pass filter unit is configured for carrying out in-band filtering on broadband communication signals of different systems and inhibiting out-of-band spurious, harmonic and image frequencies;
a second wideband matching circuit configured to impedance match the filtered wideband communication signal and suppress out-of-band self-excitation;
the first variable frequency mixing unit 4 comprises a high-frequency broadband frequency mixing circuit 401 and a first high-purity frequency synthesis local oscillator module;
the high-frequency broadband mixing circuit 401 is configured to perform high-frequency mixing on broadband communication signals of different systems to generate full-system variable high-medium-frequency communication signals;
the first high-purity frequency synthesis local oscillator module is configured to provide high-phase noise local oscillators for broadband high frequency mixing for broadband communication signals of different systems;
the second multi-system preselection filtering unit 5 comprises a third broadband matching circuit, a third path switching unit 501, a band-pass filter unit and a fourth broadband matching circuit;
the third broadband matching circuit is configured for carrying out port impedance matching on the full-system variable high-medium frequency communication signal and inhibiting out-of-band self-excitation;
a third path switching unit 501 configured to perform path switching on the full-system variable high-medium frequency communication signal;
the band-pass filter unit is configured for carrying out in-band filtering on the full-system variable high-medium frequency communication signal and inhibiting out-of-band spurious;
the fourth broadband matching circuit is configured to perform impedance matching on the filtered full-system variable high-medium frequency communication signal and inhibit out-of-band self-excitation;
the second variable frequency mixing unit 6 comprises a low-frequency broadband frequency mixing circuit 601 and a second high-purity frequency synthesis local oscillator module;
the low-frequency broadband mixing circuit 601 is configured to perform low-frequency mixing on the full-system variable high-intermediate-frequency communication signal to generate a full-system variable low-intermediate-frequency communication signal;
the second high-purity frequency synthesis local oscillator module is configured to provide a high-phase noise local oscillator for full-system variable high-medium frequency communication signals to perform broadband low-frequency mixing;
the third multi-system preselection filtering unit 7 comprises a fifth broadband matching circuit, a fourth channel switching unit 701, a band-pass filter unit and a sixth broadband matching circuit;
the fifth broadband matching circuit is configured for carrying out port impedance matching on the full-system variable low-intermediate frequency communication signals and inhibiting out-of-band self-excitation;
a fourth path switching unit 701 configured to perform path switching on the full-system variable low-intermediate frequency communication signal;
the band-pass filter unit is configured for carrying out in-band filtering on the full-system variable low-intermediate frequency communication signals and inhibiting out-of-band spurious;
the sixth broadband matching circuit is configured to perform impedance matching on the filtered full-system variable low-intermediate frequency communication signal and suppress out-of-band self-excitation;
the baseband data acquisition unit 8 comprises a high-speed ADC and a high-performance FPGA/DSP;
the high-speed ADC is configured for carrying out analog-to-digital conversion on the matched full-system variable low-intermediate frequency communication signals;
the high-performance FPGA/DSP is configured for carrying out high-speed data processing on the converted digital signals to complete demodulation of corresponding standard broadband signals;
the specific working method of the device is that full-system broadband communication signals are subjected to maximum level amplitude limitation through an amplitude limiting module 1, a demodulation device is protected, output broadband signals enter a level switching unit 2, the level amplification or attenuation is realized through channel switching through a first channel switching unit 201 according to the signal level, the channel level working requirement under the linear state is met, the full-system broadband communication signals after level adjustment enter a first multi-system preselection filtering unit 3 and then are subjected to impedance matching and out-of-band self-excitation inhibition through a first broadband matching circuit, the matched broadband communication signals respectively enter different-system band-pass filters for in-band filtering through a second channel switching unit 301 according to different communication systems, the filtered broadband signals are subjected to impedance matching and out-of-band self-excitation inhibition through a second broadband matching circuit, the matched broadband communication signals enter a first variable frequency mixing unit 4 and are subjected to high frequency mixing with a first high-purity frequency synthesis local oscillator module, generating full-system variable high-intermediate frequency communication signals, entering a second multi-system preselection filtering unit 5, then carrying out impedance matching and suppressing out-of-band self-excitation through a third broadband matching circuit, respectively entering different-system band-pass filters for in-band filtering through a third channel switching unit 501 according to different communication systems, carrying out impedance matching and suppressing out-of-band self-excitation through a fourth broadband matching circuit on the filtered full-system variable high-intermediate frequency communication signals, entering a second variable mixing unit 6 and a second high-purity frequency synthesis local oscillator module for low mixing to generate full-system variable low-intermediate frequency communication signals, entering a third multi-system preselection filtering unit 7, then carrying out impedance matching and suppressing self-excitation through a fifth broadband matching circuit, the matched full-system variable low-intermediate frequency communication signals respectively enter different-system band-pass filters for in-band filtering through a fourth path switching unit 701 according to different communication systems, the filtered full-system variable low-intermediate frequency communication signals are subjected to impedance matching and out-of-band self-excitation suppression through a sixth broadband matching circuit, the matched full-system variable low-intermediate frequency communication signals enter a baseband data acquisition unit 8 and then are subjected to analog-to-digital conversion through a high-speed ADC, and the converted digital signals are subjected to high-speed data acquisition processing through a high-performance FAGA/DSP, so that the demodulation requirements of the full-system broadband communication signals are met.
The demodulation device supporting the full-standard broadband communication signals comprises an amplitude limiting module, a level switching unit, a first multi-standard preselection filtering unit, a first variable mixing unit, a second multi-standard preselection filtering unit, a second variable mixing unit, a third multi-standard preselection filtering unit and a baseband data acquisition unit; the amplitude limiting module inhibits the maximum level amplitude of the full-standard broadband communication signal and protects the demodulation device; the level switching unit amplifies or attenuates the broadband communication signal power to realize the input of the optimal power level; the first multi-system preselection filtering unit eliminates out-of-band spurious, harmonic and mirror frequency of full-system broadband signals; the first variable frequency mixing unit realizes high frequency mixing of the full-system communication signals and generates full-system variable high-medium frequency communication signals; the second multi-system preselection filtering unit eliminates the out-of-band spurious interference of the full-system high-medium frequency communication signal; the second variable frequency mixing unit realizes frequency mixing of the full-system variable high-intermediate frequency communication signals and generates full-system variable low-intermediate frequency communication signals; the third multi-system preselection filtering unit eliminates the out-of-band spurious interference of the full-system variable low-intermediate frequency communication signal; the baseband data acquisition module realizes high-speed AD conversion and data acquisition processing of the full-standard variable low-intermediate frequency communication signals and meets the demodulation requirements of the full-standard broadband communication signals.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (8)
1. A demodulation device supporting full-standard broadband communication signals is characterized in that the system comprises an amplitude limiting module, a level switching unit, a first multi-standard preselection filtering unit, a first variable frequency mixing unit, a second multi-standard preselection filtering unit, a second variable frequency mixing unit, a third multi-standard preselection filtering unit and a baseband data acquisition unit, wherein the amplitude limiting module, the level switching unit, the first multi-standard preselection filtering unit, the first variable frequency mixing unit, the second multi-standard preselection filtering unit, the second variable frequency mixing unit, the third multi-standard preselection filtering unit and the baseband data acquisition unit are sequentially connected;
the limiting module limits the maximum level amplitude, the level switching unit amplifies or attenuates the level of the communication signal after amplitude limiting, the full-system broadband communication signal after level adjustment eliminates the out-of-band spurious, harmonic and mirror frequency of the broadband signal through the first multi-system preselection filtering unit, the full-system communication signal is subjected to high frequency mixing through the first variable frequency mixing unit to output signals to generate full-system variable high-intermediate frequency communication signals, the out-of-band spurious interference is eliminated through the second multi-system preselection filtering unit, the full-system variable low-intermediate frequency communication signals are generated through the second variable frequency mixing unit, the out-of-band spurious interference is eliminated through the third multi-system preselection filtering unit, and high-speed data acquisition processing is completed on the full-system variable low-intermediate frequency communication signals through the baseband data acquisition unit.
2. The demodulation apparatus supporting full-standard wideband communication signals according to claim 1, wherein the level switching unit includes a first path switching unit, a level attenuation module, and a low noise power amplification module, the first path switching unit, the level attenuation module, and the low noise power amplification module are sequentially connected, the first path switching unit is configured to perform path switching on the full-standard wideband communication signals to implement level amplification or attenuation, the level attenuation module is configured to perform level attenuation on the communication signals to meet the operating requirement of path level in a linear state, and the low noise power amplification module is configured to perform power amplification on the low power communication signals.
3. The demodulation apparatus supporting full-system wideband communication signal as claimed in claim 1, the first multi-system preselection filtering unit comprises a first broadband matching circuit, a second path switching unit, a band-pass filter unit and a second broadband matching circuit, the first broadband matching circuit, the second path switching unit, the band-pass filter unit and the second broadband matching circuit are connected in sequence, the first broadband matching circuit is used for carrying out port impedance matching on an input broadband communication signal and restraining out-of-band self-excitation, the second path switching unit is used for switching paths of broadband communication signals of different systems, the band-pass filter unit is used for carrying out in-band filtering on broadband communication signals of different systems, inhibiting out-of-band spurious, harmonic and image frequencies, the second broadband matching circuit is used for carrying out impedance matching on the filtered broadband communication signals and restraining out-of-band self-excitation.
4. The demodulation apparatus according to claim 1, wherein the first variable frequency mixing unit comprises a high-frequency broadband frequency mixing circuit and a first high-purity frequency synthesized local oscillator module, an input end of the high-frequency broadband frequency mixing circuit is connected to an output end of the first multi-system preselection filtering unit and an output end of the first high-purity frequency synthesized local oscillator module, an output end of the high-frequency broadband frequency mixing circuit is connected to an input end of the second multi-system preselection filtering unit, the high-frequency broadband frequency mixing circuit is configured to perform high-frequency mixing on different-system broadband communication signals to generate a full-system variable high-medium-frequency communication signal, and the first high-purity frequency synthesized local oscillator module is configured to provide a high-phase local oscillator for performing broadband high-frequency mixing on the different-system broadband communication signals.
5. The demodulation apparatus supporting full-system wideband communication signal as claimed in claim 1, the second multi-system preselection filter unit comprises a third broadband matching circuit, a third path switching unit, a band-pass filter unit and a fourth broadband matching circuit, the third broadband matching circuit, the third path switching unit, the band-pass filter unit and the fourth broadband matching circuit are connected in sequence, the third broadband matching circuit is used for carrying out port impedance matching on the full-system variable high-intermediate frequency communication signals and inhibiting out-of-band self-excitation, the third path switching unit is used for switching paths of the full-system variable high-medium frequency communication signals, the band-pass filter unit is used for carrying out in-band filtering on the full-system variable high-medium frequency communication signals and inhibiting out-of-band spurious, the fourth broadband matching circuit is used for carrying out impedance matching on the filtered full-system variable high-medium frequency communication signal and inhibiting out-of-band self-excitation.
6. The demodulation apparatus according to claim 1, wherein the second variable frequency mixing unit comprises a low-frequency broadband frequency mixing circuit and a second high-purity frequency synthesized local oscillator module, an input terminal of the low-frequency broadband frequency mixing circuit is connected to an output terminal of the second multi-system preselection filtering unit and an output terminal of the second high-purity frequency synthesized local oscillator module, an output terminal of the low-frequency broadband frequency mixing circuit is connected to an input terminal of the third multi-system preselection filtering unit, the low-frequency broadband frequency mixing circuit is configured to perform low-frequency mixing on the full-system variable high-intermediate-frequency communication signal to generate a full-system variable low-intermediate-frequency communication signal, and the second high-purity frequency synthesized local oscillator module is configured to perform high-frequency low-frequency mixing on the full-system variable high-intermediate-frequency local oscillator signal to provide high-phase noise.
7. The demodulation apparatus supporting full-system wideband communication signal as claimed in claim 1, the third multi-system preselection filter unit comprises a fifth broadband matching circuit, a fourth channel switching unit, a band-pass filter unit and a sixth broadband matching circuit, the fifth broadband matching circuit, the fourth path switching unit, the band-pass filter unit and the sixth broadband matching circuit are connected in sequence, the fifth broadband matching circuit is used for carrying out port impedance matching on the full-system variable low-intermediate frequency communication signals and inhibiting out-of-band self-excitation, the fourth path switching unit is used for switching paths of the full-system variable low-intermediate frequency communication signals, the band-pass filter unit is used for carrying out in-band filtering on the full-system variable low-intermediate frequency communication signals and inhibiting out-of-band spurious, and the sixth broadband matching circuit is used for performing impedance matching on the filtered full-system variable low-intermediate frequency communication signal and inhibiting out-of-band self-excitation.
8. The demodulation device supporting the full-standard broadband communication signal according to claim 1, wherein the baseband data acquisition unit comprises a high-speed ADC unit, a high-performance FPGA, and a DSP processing unit, the high-speed ADC unit, the high-performance FPGA, and the DSP processing unit are sequentially connected, the high-speed ADC unit is configured to perform analog-to-digital conversion on the matched full-standard variable low-intermediate frequency communication signal, and the high-performance FPGA and the DSP processing unit are configured to perform high-speed data processing on the converted digital signal to complete demodulation of the corresponding standard broadband signal.
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