CN113054953A - Broadband waveform generating assembly and method - Google Patents
Broadband waveform generating assembly and method Download PDFInfo
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- CN113054953A CN113054953A CN202110319490.1A CN202110319490A CN113054953A CN 113054953 A CN113054953 A CN 113054953A CN 202110319490 A CN202110319490 A CN 202110319490A CN 113054953 A CN113054953 A CN 113054953A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
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- H—ELECTRICITY
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- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
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Abstract
The invention discloses a broadband waveform generation assembly and method, the assembly comprising: the FPGA programmable logic processor, the high-speed ADC and the high-speed DAC; the FPGA programmable logic unit is used for receiving an external control signal and sampling data input by the high-speed ADC, generating a linear frequency modulation signal in real time according to the input control signal, performing distortion and filtering processing on the linear frequency modulation signal, converting the linear frequency modulation signal into a serial signal, outputting the serial signal to the high-speed DAC, and performing digital-to-analog conversion on the serial signal by the high-speed DAC to output a broadband waveform signal. The invention realizes a multi-channel parameterized waveform generating module, a predistortion filter module and a filter coefficient calculating module in the FPGA programmable logic device, can generate broadband linear frequency modulation waveforms with any bandwidth and pulse width in real time and in a parameterized manner, can be self-adaptive to predistortion, and improves the predistortion efficiency of components.
Description
Technical Field
The present invention relates to the field of communications, and more particularly, to a wideband waveform generation assembly and method.
Background
The existing broadband waveform generating assembly can only output broadband waveforms with specific bandwidths and pulse widths, when amplitude and phase pre-distortion is carried out, other equipment is required to record emission waveforms, distortion characteristics are calculated and stored, and when the consistency of the amplitude and phase characteristics of a plurality of assemblies is poor, repeated recording and calculation are required, so that time and labor are wasted.
Disclosure of Invention
To solve at least one of the technical problems set forth in the background, it is an object of the present invention to provide a wideband waveform generation assembly and method, the wideband waveform generation assembly including: the FPGA programmable logic processor, the high-speed ADC and the high-speed DAC;
the FPGA programmable logic unit is used for receiving an external control signal and sampling data input by the high-speed ADC, generating a linear frequency modulation signal in real time according to the input control signal, performing distortion and filtering processing on the linear frequency modulation signal, converting the linear frequency modulation signal into a serial signal, outputting the serial signal to the high-speed DAC, and performing digital-to-analog conversion on the serial signal by the high-speed DAC to output a broadband waveform signal.
The FPGA programmable logic processor comprises: the device comprises a multi-channel parameterized waveform generating module, a predistortion filter module and a parallel-serial conversion module; the multi-channel parameterized waveform generating module is used for receiving the external control signal and generating a linear frequency modulation waveform signal in real time according to the external control signal; the predistortion filter module is used for changing the amplitude and phase characteristics of the input linear frequency modulation waveform signal to complete predistortion; and the parallel-serial conversion module is used for receiving the parallel data output by the predistortion filter module, converting the parallel data into serial data and outputting the serial data.
The FPGA programmable logic processor also includes a filter coefficient calculation module,
the filter coefficient calculation module is configured to receive the sampling data input by the high-speed ADC, sequentially perform FFT operation (fast algorithm of discrete fourier transform) and IFFT operation (fast algorithm of inverse discrete fourier transform) to obtain a filter coefficient, and output the filter coefficient to the filter coefficient input port of the predistortion filter module.
Preferably, the output end of the input clock signal is connected with the clock input ends of the high-speed ADC and the high-speed DAC.
One path of the broadband waveform signal output by the high-speed DAC is directly output, the other path of the broadband waveform signal is output to the high-speed ADC as a sampling signal, and the high-speed ADC converts the broadband waveform signal into a digital signal and then outputs the digital signal to the filter coefficient calculation module.
Preferably, the FFT operation is used to convert the sampled data from the time domain to the frequency domain, and obtain the amplitude and phase characteristics thereof.
Another aspect of the present invention provides a wideband waveform generating method, including:
the FPGA programmable logic processor comprises: the device comprises a multi-channel parameterized waveform generating module, a predistortion filter module and a parallel-serial conversion module; the multichannel parametric waveform generation module receives an external control signal and generates a linear frequency modulation waveform signal in real time according to the external control signal; the predistortion filter module changes the amplitude and phase characteristics of the input linear frequency modulation waveform signal to complete predistortion; and the parallel-serial conversion module receives the parallel data output by the predistortion filter module, converts the parallel data into serial data and outputs the serial data.
The FPGA programmable logic processor further comprises: a filter coefficient calculation module for calculating a filter coefficient,
the filter coefficient calculation module receives the sampling data input by the high-speed ADC, and sequentially performs FFT (fast algorithm of discrete Fourier transform) and IFFT (fast algorithm of inverse discrete Fourier transform) to obtain a filter coefficient and outputs the filter coefficient to a filter coefficient input port of the predistortion filter module.
The FPGA programmable logic unit is used for receiving an external control signal and sampling data input by the high-speed ADC, generating a linear frequency modulation signal in real time according to the input control signal, performing distortion and filtering processing on the linear frequency modulation signal, converting the linear frequency modulation signal into a serial signal and outputting the serial signal to the high-speed DAC, and the high-speed DAC performs digital-to-analog conversion on the serial signal and outputs a broadband waveform signal
One path of the broadband waveform signal output by the high-speed DAC is directly output, the other path of the broadband waveform signal is output to the high-speed ADC as a sampling signal, and the high-speed ADC converts the broadband waveform signal into a digital signal and outputs the digital signal to the filter coefficient calculation module; and the output end of the input clock signal is connected with the clock input ends of the high-speed ADC and the high-speed DAC.
The invention has the following beneficial effects:
the output signal broadband of the invention can reach 1.5GHz, the flatness in the wave band after self-adaptive predistortion is less than 1dB, the linearity of the phase in the wave band is less than 5 degrees, and the filter coefficient is self-adaptively updated, flexible and reliable.
Drawings
FIG. 1 illustrates a block diagram of a wideband waveform generation assembly in accordance with one embodiment of the present invention;
fig. 2 is a schematic diagram of a wideband waveform generation method according to an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
One embodiment of the present invention provides a wideband waveform generation assembly;
as shown in fig. 1, the wideband waveform generation assembly includes:
the device comprises an FPGA programmable logic device 5, a high-speed analog-to-digital conversion unit (high-speed ADC)6 and a high-speed digital-to-analog conversion unit (high-speed DAC)7, wherein the FPGA programmable logic device 5 comprises a multi-channel parameterized waveform generation module 1, a predistortion filter module 2, a filter coefficient calculation module 3 and a parallel-serial conversion module 4.
The multichannel parametric waveform generating module 1 generates linear frequency modulation waveforms with any bandwidth and pulse width in a real-time and parametric mode according to input control signals; the broadband waveform output by the multi-channel parametric waveform generating module 1 enters the predistortion filter module 2 through the filter coefficient input interface, and then the amplitude and phase characteristics are changed, so that predistortion is completed; the parallel-serial conversion module 4 receives the parallel data processed by the predistortion filter module 2 and converts the parallel data into serial data suitable for the high-speed DAC 7; the data output interface of the parallel-serial conversion module 4 is connected with the data input end of the high-speed DAC 7; the high-speed DAC7 has two output ends, including a high-speed ADC6 sampling signal output end and a broadband waveform signal output end;
the filter coefficient can be calculated and updated in real time according to the use environment, the filter coefficient calculation module 3 receives the sampling data output by the high-speed ADC6 and performs FFT operation, converts the sampling data from the time domain to the frequency domain to obtain the amplitude and phase characteristics of the sampling signal, and performs IFFT operation to obtain the filter coefficient, and the filter coefficient input interface of the predistortion filter module 2 receives the filter coefficient and performs predistortion processing according to the filter coefficient;
the input control signal of the component is connected with the input interface of the multi-channel parameterized waveform generation module 1; the data output interface of the multi-channel parameterized waveform generating module 1 is connected with the data input interface of the predistortion filter module 2; the filter coefficient input interface of the predistortion filter module 2 is connected with the coefficient output interface of the filter coefficient calculation module 3; the data input interface of the filter coefficient calculation module 3 is connected with the data output interface of the high-speed ADC 6; the data output interface of the predistortion filter module 2 is connected with the data input interface of the parallel-serial conversion module 4; the data output interface of the parallel-serial conversion module 4 is connected with the data input end of the high-speed DAC 7; the input clock signal is connected to the clock inputs of the high-speed ADC6 and the high-speed DAC 7.
The wideband waveform generating component provided by the first embodiment of the invention realizes a multi-channel parameterized waveform generating module, a predistortion filter module and a filter coefficient calculating module in an FPGA programmable logic device, because a high-speed DAC supports a 1.5GHz bandwidth, the bandwidth of an output signal of the invention can reach 1.5GHz, the flatness in a waveform band after adaptive predistortion is less than 1dB, the linearity of an in-band phase is less than 5 degrees, the filter coefficient is updated in an adaptive way, and the invention is flexible and reliable, and improves the predistortion efficiency of the component.
In another embodiment, the present invention provides a wideband waveform generation method, as shown in fig. 2, comprising:
the multichannel parametric waveform generation module generates linear frequency modulation waveforms with any bandwidth and any pulse width in real time according to input control signals, enters the parallel-serial conversion module to be converted into parallel data after being subjected to predistortion processing by the predistortion filter module, and then is output to the high-speed DAC7 to be converted into broadband waveform signals to be finally output;
another path of broadband waveform signal of the high-speed DAC7 (high-speed digital-to-analog conversion) is output to the high-speed ADC6 as a feedback signal, the high-speed ADC (analog-to-digital conversion) samples the signal and converts the signal into a digital signal, the digital sampled signal is output to the filter coefficient calculation module 3, a filter coefficient is obtained through calculation, and the filter coefficient is output to the predistortion filter module for predistortion conversion.
The high-speed DAC is a high-speed digital-to-analog converter, and the high-speed (more than or equal to 30MSPS) DAC comprises broadband radio frequency, intermediate frequency signal processing and general baseband category.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. A wideband waveform generating assembly, characterized in that,
the method comprises the following steps: the FPGA programmable logic processor, the high-speed ADC and the high-speed DAC;
the FPGA programmable logic unit is used for receiving an external control signal and sampling data input by the high-speed ADC, generating a linear frequency modulation signal in real time according to the input control signal, performing distortion and filtering processing on the linear frequency modulation signal, converting the linear frequency modulation signal into a serial signal, outputting the serial signal to the high-speed DAC, and performing digital-to-analog conversion on the serial signal by the high-speed DAC to output a broadband waveform signal.
2. The assembly of claim 1,
the FPGA programmable logic processor comprises: the device comprises a multi-channel parameterized waveform generating module, a predistortion filter module and a parallel-serial conversion module; the multi-channel parameterized waveform generating module is used for receiving the external control signal and generating a linear frequency modulation waveform signal in real time according to the external control signal; the predistortion filter module is used for changing the amplitude and phase characteristics of the input linear frequency modulation waveform signal to complete predistortion; and the parallel-serial conversion module is used for receiving the parallel data output by the predistortion filter module, converting the parallel data into serial data and outputting the serial data.
3. The assembly of claim 2,
the FPGA programmable logic processor also includes a filter coefficient calculation module,
the filter coefficient calculation module is configured to receive the sampling data input by the high-speed ADC, sequentially perform FFT operation (fast algorithm of discrete fourier transform) and IFFT operation (fast algorithm of inverse discrete fourier transform) to obtain a filter coefficient, and output the filter coefficient to the filter coefficient input port of the predistortion filter module.
4. The assembly of claim 1,
and the output end of the input clock signal is connected with the clock input ends of the high-speed ADC and the high-speed DAC.
5. The assembly of claim 1,
one path of the broadband waveform signal output by the high-speed DAC is directly output, the other path of the broadband waveform signal is output to the high-speed ADC as a sampling signal, and the high-speed ADC converts the broadband waveform signal into a digital signal and then outputs the digital signal to the filter coefficient calculation module.
6. The assembly of claim 3,
and the FFT operation is used for converting the sampling data from a time domain to a frequency domain to obtain the amplitude and phase characteristics of the sampling data.
7. A method of wideband waveform generation using the assembly of any of claims 1-6,
the FPGA programmable logic processor comprises: the device comprises a multi-channel parameterized waveform generating module, a predistortion filter module and a parallel-serial conversion module; the multichannel parametric waveform generation module receives an external control signal and generates a linear frequency modulation waveform signal in real time according to the external control signal; the predistortion filter module changes the amplitude and phase characteristics of the input linear frequency modulation waveform signal to complete predistortion; and the parallel-serial conversion module receives the parallel data output by the predistortion filter module, converts the parallel data into serial data and outputs the serial data.
8. The method of claim 7,
the FPGA programmable logic processor further comprises: a filter coefficient calculation module for calculating a filter coefficient,
the filter coefficient calculation module receives the sampling data input by the high-speed ADC, and sequentially performs FFT (fast algorithm of discrete Fourier transform) and IFFT (fast algorithm of inverse discrete Fourier transform) to obtain a filter coefficient and outputs the filter coefficient to a filter coefficient input port of the predistortion filter module.
9. The method of claim 7,
the FPGA programmable logic unit is used for receiving an external control signal and sampling data input by the high-speed ADC, generating a linear frequency modulation signal in real time according to the input control signal, performing distortion and filtering processing on the linear frequency modulation signal, converting the linear frequency modulation signal into a serial signal, outputting the serial signal to the high-speed DAC, and performing digital-to-analog conversion on the serial signal by the high-speed DAC to output a broadband waveform signal.
10. The method of claim 9,
one path of the broadband waveform signal output by the high-speed DAC is directly output, the other path of the broadband waveform signal is output to the high-speed ADC as a sampling signal, and the high-speed ADC converts the broadband waveform signal into a digital signal and outputs the digital signal to the filter coefficient calculation module; and the output end of the input clock signal is connected with the clock input ends of the high-speed ADC and the high-speed DAC.
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| CN114296507A (en) * | 2021-11-23 | 2022-04-08 | 北京无线电测量研究所 | Broadband waveform generation and channel equalization method and system |
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