CN102624673A - Processing method of orthogonal modulation signal and system thereof - Google Patents
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Abstract
The invention discloses a processing method of an orthogonal modulation signal. The method comprises the following steps: carrying out digital up-conversion processing on an in-phase component signal and a quadrature component signal so as to obtain an intermediate frequency signal of the in-phase component and the intermediate frequency signal of the quadrature component; fully filtering or partially filtering one sideband of the intermediate frequency signal of the in-phase component and the intermediate frequency signal of the quadrature component so as to obtain the intermediate frequency signal after the filtering processing. The invention also provides a processing system for realizing the orthogonal modulation signal. According to the technical scheme of the invention, a utilization rate of the frequency spectrum can be further increased.
Description
Technical Field
The present invention relates to signal processing technologies in the field of communications, and in particular, to a method and a system for processing quadrature modulation signals.
Background
Wireless communication systems are rapidly developing in the world, and meanwhile, wireless spectrum resources are increasingly tense; nowadays, wireless communication systems have been developed to the next 3 rd generation and the next 4 th generation, and the upgrade and development of the wireless communication systems are all centered on the improvement of spectral efficiency, wherein as the wireless communication systems of the next 3 rd generation and the next 4 th generation, such as a Long Term Evolution (LTE) system, an LTE-Advanced (LTE-Advanced) system, and the like, the basic modulation technology thereof is an Orthogonal Frequency Division Multiplexing (OFDM) modulation technology because the OFDM modulation technology has high spectral efficiency and the OFDM technology is widely applied in the field of digital broadcasting; therefore, in order to enable a channel in a wireless communication system to carry more communication data, researchers need to continuously seek to improve the utilization rate of the frequency spectrum of the existing OFDM modulation technology.
Disclosure of Invention
In view of the above, the present invention provides a method and a system for processing an orthogonal modulation signal, which can further improve the utilization rate of a frequency spectrum.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a processing method for realizing orthogonal modulation signals, which comprises the following steps:
carrying out digital up-conversion processing on the signals of the in-phase component and the orthogonal component to obtain intermediate frequency signals of the in-phase component and intermediate frequency signals of the orthogonal component;
and completely filtering or partially filtering one sideband of the intermediate frequency signal of the in-phase component and the intermediate frequency signal of the quadrature component to obtain the intermediate frequency signal after filtering processing.
In the above method, the method further comprises:
performing digital-to-analog conversion on the filtered intermediate frequency signal to obtain an analog baseband signal;
carrying out up-conversion frequency mixing processing on the analog baseband signal to obtain a radio frequency signal;
and transmitting the radio frequency signal after filtering and amplifying the radio frequency signal.
In the above method, the performing digital up-conversion on the signals of the in-phase component and the quadrature component includes:
and determining the digital frequency of the digital up-conversion, and performing digital up-conversion processing on the signals of the in-phase component and the quadrature component according to the determined digital frequency of the digital up-conversion.
In the above method, the determining the digital frequency of the digital up-conversion is:
the digital frequency of the digital up-conversion is determined according to the reserved sideband, the digital frequency of the digital up-conversion is Wn, the analog frequency of the digital up-conversion corresponding to the digital up-conversion is mf, mf is Wn multiplied by Sa/2 pi, if the reserved lower sideband, mf is larger than B, if the reserved upper sideband, mf is larger than 0.5B, if the reserved upper sideband, 2mf is larger than or equal to G, if the reserved lower sideband, 2(mf-B) is larger than or equal to G, wherein G is the transition band of the radio frequency band-pass filter, and Sa is the sampling rate.
In the above method, the digital up-converting the signals of the in-phase component and the quadrature component includes:
the signal of the in-phase component and the signal of the quadrature component are multiplied by cos [ (Wn) n ] and sin [ (Wn) n ], respectively.
In the above method, before the processing of performing digital up-conversion on the signal of the in-phase component and the signal of the quadrature component according to the determined digital frequency of the digital up-conversion, the method further includes:
interpolation processing is performed on the signal of the in-phase component and the signal of the quadrature component.
In the above method, the interpolation processing on the signal of the in-phase component and the signal of the quadrature component is:
and judging whether the signals of the in-phase component and the orthogonal component need to be interpolated, and when the sampling point rate does not meet the Nyquist sampling theorem or the band-pass sampling theorem, performing interpolation on the signals of the in-phase component and the orthogonal component.
In the above method, the filtering of all or part of one sideband of the intermediate frequency signal of the in-phase component and the intermediate frequency signal of the quadrature component is:
and filtering the intermediate frequency signal of the in-phase component and the intermediate frequency signal of the quadrature component by using a digital filter, completely or partially filtering one sideband of the intermediate frequency signal of the in-phase component and one sideband of the intermediate frequency signal of the quadrature component, and adding the two paths of signals subjected to filtering processing.
In the above-mentioned method, the first step of the method,
and performing digital-to-analog conversion on the filtered intermediate frequency signal: inputting the intermediate frequency signal after filtering processing into a digital-to-analog converter for digital-to-analog conversion;
the up-conversion frequency mixing processing on the analog baseband signal comprises the following steps: performing up-conversion frequency mixing processing on the analog baseband signal by using a frequency mixer;
the transmission after the radio frequency signal is filtered and amplified is as follows: and filtering the radio frequency signal by using a band-pass filter to obtain a modulated single-sideband radio frequency signal or a vestigial sideband radio frequency signal, amplifying the modulated single-sideband radio frequency signal or the modulated vestigial sideband radio frequency signal, and finally feeding the amplified single-sideband radio frequency signal to an antenna for transmitting.
The present invention also provides a processing system for implementing quadrature modulation signals, the system comprising: a digital frequency converter and a digital filter; wherein,
the digital frequency converter is used for carrying out digital up-conversion processing on the signals of the in-phase component and the orthogonal component to obtain intermediate frequency signals of the in-phase component and intermediate frequency signals of the orthogonal component;
and the digital filter is used for completely filtering or partially filtering one sideband of the intermediate frequency signal of the in-phase component and the intermediate frequency signal of the quadrature component to obtain the intermediate frequency signal after filtering processing.
In the above system, the system further includes: digital-to-analog converter, mixer, band-pass filter, amplifier, antenna; wherein,
the digital-to-analog converter is used for performing digital-to-analog conversion on the filtered intermediate frequency signal to obtain an analog baseband signal;
the frequency mixer is used for carrying out up-conversion frequency mixing processing on the analog baseband signal to obtain a radio frequency signal;
a band-pass filter for filtering the radio frequency signal;
the amplifier is used for amplifying the filtered radio frequency signal;
and the antenna is used for transmitting the radio frequency signal after the amplification processing.
The invention provides a method and a system for processing quadrature modulation signals, which carry out digital up-conversion processing on signals of in-phase components and signals of quadrature components to obtain intermediate frequency signals of the in-phase components and intermediate frequency signals of the quadrature components; and filtering one sideband of the intermediate frequency signal of the in-phase component and one sideband of the intermediate frequency signal of the quadrature component completely or partially to obtain the intermediate frequency signal after filtering processing, and further improving the utilization rate of the frequency spectrum of the quadrature modulation signal through the two key processing processes, thereby saving frequency spectrum resources.
Drawings
Fig. 1 is a schematic flow chart of a processing method for implementing quadrature modulation signals according to the present invention;
FIG. 2 is a first exemplary graph of a frequency spectrum in the present invention;
FIG. 3 is a two-example graph of a spectrum in the present invention;
fig. 4 is a flowchart illustrating a first embodiment of a method for processing quadrature modulated signals according to the present invention;
fig. 5 is a schematic structural diagram of a processing system for implementing quadrature modulation signals according to the present invention.
Detailed Description
The basic idea of the invention is: carrying out digital up-conversion processing on the signals of the in-phase component and the orthogonal component to obtain intermediate frequency signals of the in-phase component and intermediate frequency signals of the orthogonal component; and completely filtering or partially filtering one sideband of the intermediate frequency signal of the in-phase component and the intermediate frequency signal of the quadrature component to obtain the intermediate frequency signal after filtering processing.
The invention is further described in detail below with reference to the drawings and the specific embodiments.
The present invention provides a method for processing an orthogonal Modulation signal, wherein the orthogonal Modulation signal includes an OFDM Modulation signal, a Quadrature Amplitude Modulation (QAM) signal, a Quadrature Phase Shift Keying (QPSK) Modulation signal, etc., and the OFDM Modulation signal is taken as an example in the present invention for explanation, but is not limited to the OFDM Modulation signal.
Fig. 1 is a schematic flow chart of a processing method for implementing quadrature modulation signals according to the present invention, as shown in fig. 1, the method includes the following steps:
step 101, performing digital up-conversion processing on the signals of the in-phase component and the quadrature component to obtain intermediate frequency signals of the in-phase component and intermediate frequency signals of the quadrature component;
specifically, i (n) and q (n) are taken as signals to be processed, where i (n) and q (n) are signals of an in-phase component and signals of an orthogonal component, respectively, and are generally time domain data after being subjected to shaping filtering in the OFDM modulation technology, where the time domain data is a discrete time signal, and is input to a Digital-to-Analog Converter (DAC) for Digital-to-Analog conversion, and an Analog baseband signal is obtained after the Digital-to-Analog conversion, in this embodiment, the bandwidths of Analog baseband signals corresponding to i (n) and q (n) are set as B, and the sampling rates of i (n) and q (n) are set as Sa;
carrying out digital up-conversion treatment on I (n) and Q (n), and concretely comprises the following three steps: firstly, determining digital frequency Wn of digital up-conversion, secondly, judging whether I (n) and Q (n) need to be subjected to interpolation processing, and finally, performing digital up-conversion on I (n) and Q (n) according to the determined digital frequency Wn of digital up-conversion;
the digital frequency of the digital up-conversion is determined according to the reserved sideband, the digital frequency of the digital up-conversion is Wn, and the analog frequency of the digital up-conversion corresponding to the digital frequency is mf, wherein mf is Wn multiplied by Sa/2 pi, if the reserved lower sideband is, mf is greater than B, and if the reserved upper sideband is, mf is greater than 0.5B; here, it is also necessary to determine the range of Wn, and after the radio frequency signal is finally generated, the interval between the two sidebands is 2Wn, and the interval needs to be large enough to ensure the filtering effect of the radio frequency band pass filter, for example, if the transition band of the radio frequency band pass filter is G, 2mf ≧ G for the case that the upper sideband is reserved, and 2(mf-B) ≧ G for the case that the lower sideband is reserved;
before performing digital up-conversion on I (n) and Q (n) according to the determined digital frequency of the digital up-conversion, judging whether I (n) and Q (n) need to be subjected to interpolation processing or not, wherein the interpolation processing is performed to improve the sampling rate, wherein Sa needs to meet the Nyquist sampling theorem, namely if an upper sideband is reserved, Sa is more than 2(mf + B), and if a lower sideband is reserved, Sa is more than or equal to 2mf + B; when Sa does not satisfy the nyquist sampling theorem, it is necessary to interpolate i (n) and q (n) to raise Sa so that it satisfies the nyquist sampling theorem; for example, the original sampling rate is 100 points/second, and after twice interpolation processing is performed on i (n) and q (n), the sampling rate is 200 points/second; here, Sa may satisfy the band-pass sampling theorem, and when Sa does not satisfy the band-pass sampling theorem, it is necessary to perform interpolation processing on i (n) and q (n), the band-pass sampling theorem is substantially the same as the nyquist sampling theorem, and the principle of the band-pass sampling theorem is: according to the knowledge about signal processing, the frequency spectrum of the digital signal is periodic, and for an analog signal corresponding to the frequency spectrum in a first main value interval of the periodic frequency spectrum, wherein the frequency carrier frequency is mf, if the frequency component of 2, 3 or even n-th main value interval of the periodic frequency spectrum is acquired when the analog signal is generated, the frequency carrier frequency of the corresponding analog signal is mf + Sa x (n-1), wherein n is a natural number greater than 1;
according to the determined digital frequency Wn of digital up-conversion, a digital frequency converter is utilized to carry out digital up-conversion on I (n) and Q (n), i.e. I (n) and Q (n) are multiplied by cos [ (Wn) n ] and sin [ (Wn) n ] respectively to obtain an intermediate frequency signal Iw (n) of an in-phase component and an intermediate frequency signal Qw (n) of an orthogonal component after the I (n) and Q (n) are subjected to digital up-conversion; the digital frequency converter can be realized by a digital signal processing chip or a digital circuit.
102, completely filtering or partially filtering one sideband of the intermediate frequency signal of the in-phase component and one sideband of the intermediate frequency signal of the quadrature component to obtain an intermediate frequency signal after filtering;
specifically, a digital filter F1(n) is used for filtering an intermediate frequency signal iw (n) of an in-phase component and an intermediate frequency signal qw (n) of an orthogonal component, one sideband of iw (n) and one sideband of qw (n) are completely or partially filtered, and then two paths of signals after filtering are added to obtain an intermediate frequency signal s (n) after filtering; in this embodiment, taking the upper sideband is completely filtered out as an example, the frequency spectrum of s (n) is shown in fig. 2; here, one sideband of iw (n) and qw (n) may be either the upper sideband or the lower sideband;
the digital filter F1(n) may be any suitable method, and is not limited to Finite Impulse Response (FIR) type filtering, and may also be a generalized filtering method such as Infinite Impulse Response (IIR), or Fast Fourier Transform (FFT) followed by frequency domain conversion, direct zeroing of the band-filtered components, Inverse Fast Fourier Transform (IFFT), and time domain conversion.
103, performing digital-to-analog conversion on the filtered intermediate-frequency signal to obtain an analog baseband signal;
specifically, the filtered intermediate frequency signal s (n) is input to a DAC, and the DAC performs digital-to-analog conversion on s (n), and converts s (n) into an analog baseband signal s (t), where the carrier frequency of the analog single-sideband signal of s (t) is mf ═ Wn × Sa/2 pi, and Sa is the sampling rate of iw (n) and qw (n).
104, performing up-conversion frequency mixing processing on the analog baseband signal to obtain a radio frequency signal;
specifically, in order to convert a lower carrier frequency of the analog baseband signal to a higher radio frequency, a mixer needs to perform up-conversion mixing processing on the analog baseband signal s (t) to obtain a radio frequency signal srf (t); the local oscillator frequency is rf-mf, and the target carrier frequency is rf.
105, filtering and amplifying the radio frequency signal and then transmitting the radio frequency signal;
specifically, a band-pass filter is used for filtering a radio frequency signal srf (t) to obtain a modulated single-sideband radio frequency signal sc (t) or a vestigial sideband radio frequency signal sc (t), amplification processing is required later, and finally the modulated single-sideband radio frequency signal sc (t) is fed to an antenna for transmission, which belongs to the prior art and is not described herein again; here, the frequency spectra of the band pass filter, srf (t), and sc (t) are shown in fig. 3.
Example one
In this embodiment, taking downlink transmission radio frequency signals of an LTE system as an example, fig. 4 is a flowchart illustrating a first embodiment of a processing method for implementing quadrature modulation signals according to the present invention, as shown in fig. 4, the method includes the following steps:
step 401, performing digital up-conversion on i (n) and q (n) to obtain iw (n) and qw (n);
specifically, a Radio Frequency carrier Frequency (RF) is 2580MHz, according to 3GPPTS36.211V8.0.0 specifications, if a system bandwidth of 20MHz is adopted, 1 time oversampling is performed, there are 100 resource blocks in total, sampling rates Sa of i (n) and q (n) are 30.768Msps (million samples per second), a bandwidth of an analog baseband signal is 10MHz, and if a lower sideband (i.e., a Frequency spectrum component of a negative Frequency axis in a baseband form) is reserved, a transition band G of the Radio Frequency band-pass filter is 10 MHz;
according to 2(mf-B) ≧ G, mf > -15 MHz, and then mf is 15.384 MHz; adopting Sa to satisfy the Nyquist sampling theorem, the Sa > 2mf + B needs to be satisfied, under the premise that mf > 15MHz, 2mf + B is 40MHz, then Sa-30.768 Mhz does not satisfy the Sa > 2mf + B condition, therefore I (n) and Q (n) need to be interpolated, and a proper mf value is selected to satisfy the two formulas of Sa > 2mf + B and 2(mf-B) ≥ G at the same time, here, mf is 15.384MHz, Sa is interpolated twice, Sa is increased to 61.536Msps, and thus the requirement is satisfied; at this time, Wn (mf/Sa) × 2 pi is 0.5 pi, and then multiplied by the doubled interpolated i (n) and q (n) with the digital signals of cos [ (Wn) n ] and sin [ (Wn) n ] having a sampling rate of Sa 61.536Msps and frequencies of Wn, respectively, to obtain iw (n) and qw (n).
Step 402, carrying out filtering processing on Iw (n) and Qw (n) to obtain S (n);
specifically, a 1024-order FIR filter is adopted to filter and add iw (n) and qw (n) respectively to obtain s (n), and a spectrum diagram of iw (n), qw (n) and s (n) can be shown in fig. 2.
Step 403, performing digital-to-analog conversion on s (n) to obtain s (t);
specifically, inputting S (n) into a DAC (digital-to-analog converter) for digital-to-analog conversion to obtain an analog baseband signal S (t); in this embodiment, the sampling frequency of the DAC is set to 61.536 Msps.
Step 404, performing up-conversion frequency mixing processing on the analog baseband signal to obtain a srf (t) signal;
specifically, up-conversion frequency mixing processing is carried out on an analog baseband signal output by a DAC (digital-to-analog converter) to obtain a Srf (t) signal; the local frequency of the frequency converter is set to be 2580MHz-15.384 MHz-2564.616 MHz; then, a bandpass filter is needed to perform filtering, so as to obtain the single-sideband radio frequency signal sc (t), and the spectrum transformation process of sc (t) can be shown in fig. 3.
To implement the foregoing method, the present invention further provides a processing system for implementing quadrature modulation signals, fig. 5 is a schematic structural diagram of the processing system for implementing quadrature modulation signals of the present invention, as shown in fig. 5, the system includes: a digital frequency converter 51, a digital filter 52; wherein,
a digital frequency converter 51, configured to perform digital up-conversion processing on the signal of the in-phase component and the signal of the quadrature component to obtain an intermediate frequency signal of the in-phase component and an intermediate frequency signal of the quadrature component;
and the digital filter 52 is configured to filter all or part of one sideband of the intermediate frequency signal of the in-phase component and the intermediate frequency signal of the quadrature component to obtain the intermediate frequency signal after filtering processing.
The system further comprises: digital-to-analog converter 53, mixer 54, band-pass filter 55, amplifier 56, antenna 57; wherein,
a digital-to-analog converter 53, configured to perform digital-to-analog conversion on the filtered intermediate frequency signal to obtain an analog baseband signal;
a mixer 54, configured to perform up-conversion mixing processing on the analog baseband signal to obtain a radio frequency signal;
a band-pass filter 55 for filtering the radio frequency signal;
an amplifier 56, configured to amplify the filtered radio frequency signal;
and an antenna 57 for transmitting the amplified rf signal.
The digital up-conversion processing of the signals of the in-phase component and the quadrature component is as follows:
and determining the digital frequency of the digital up-conversion, and performing digital up-conversion processing on the signals of the in-phase component and the quadrature component according to the determined digital frequency of the digital up-conversion.
The digital frequency for determining the digital up-conversion is: the digital frequency of the digital up-conversion is determined according to the reserved sideband, the digital frequency of the digital up-conversion is Wn, the analog frequency of the digital up-conversion corresponding to the digital up-conversion is mf, mf is Wn multiplied by Sa/2 pi, if the reserved lower sideband, mf is larger than B, if the reserved upper sideband, mf is larger than 0.5B, if the reserved upper sideband, 2mf is larger than or equal to G, if the reserved lower sideband, 2(mf-B) is larger than or equal to G, wherein G is the transition band of the radio frequency band-pass filter, and Sa is the sampling rate.
The digital up-conversion processing of the signals of the in-phase component and the quadrature component is as follows: the signal of the in-phase component and the signal of the quadrature component are multiplied by cos [ (Wn) n ] and sin [ (Wn) n ], respectively.
The step of filtering out all or part of one sideband of the intermediate frequency signal of the in-phase component and the intermediate frequency signal of the quadrature component is as follows: and filtering the intermediate frequency signal of the in-phase component and the intermediate frequency signal of the quadrature component by using a digital filter, completely or partially filtering one sideband of the intermediate frequency signal of the in-phase component and one sideband of the intermediate frequency signal of the quadrature component, and adding the two paths of signals subjected to filtering processing.
And performing digital-to-analog conversion on the filtered intermediate frequency signal: inputting the intermediate frequency signal after filtering processing into a digital-to-analog converter for digital-to-analog conversion; the up-conversion frequency mixing processing on the analog baseband signal comprises the following steps: performing up-conversion frequency mixing processing on the analog baseband signal by using a frequency mixer; the transmission after the radio frequency signal is filtered and amplified is as follows: and filtering the radio frequency signal by using a band-pass filter to obtain a modulated single-sideband radio frequency signal or a vestigial sideband radio frequency signal, amplifying the modulated single-sideband radio frequency signal or the modulated vestigial sideband radio frequency signal, and finally feeding the amplified single-sideband radio frequency signal to an antenna for transmitting.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (11)
1. A processing method for implementing quadrature modulated signals, the method comprising:
carrying out digital up-conversion processing on the signals of the in-phase component and the orthogonal component to obtain intermediate frequency signals of the in-phase component and intermediate frequency signals of the orthogonal component;
and completely filtering or partially filtering one sideband of the intermediate frequency signal of the in-phase component and the intermediate frequency signal of the quadrature component to obtain the intermediate frequency signal after filtering processing.
2. The method of claim 1, further comprising:
performing digital-to-analog conversion on the filtered intermediate frequency signal to obtain an analog baseband signal;
carrying out up-conversion frequency mixing processing on the analog baseband signal to obtain a radio frequency signal;
and transmitting the radio frequency signal after filtering and amplifying the radio frequency signal.
3. The method of claim 1, wherein the digital up-converting the signals of the in-phase component and the quadrature component comprises:
and determining the digital frequency of the digital up-conversion, and performing digital up-conversion processing on the signals of the in-phase component and the quadrature component according to the determined digital frequency of the digital up-conversion.
4. The method of claim 3, wherein the determining the digital frequency of the digital up-conversion is:
the digital frequency of the digital up-conversion is determined according to the reserved sideband, the digital frequency of the digital up-conversion is Wn, the analog frequency of the digital up-conversion corresponding to the digital up-conversion is mf, mf is Wn multiplied by Sa/2 pi, if the reserved lower sideband, mf is larger than B, if the reserved upper sideband, mf is larger than 0.5B, if the reserved upper sideband, 2mf is larger than or equal to G, if the reserved lower sideband, 2(mf-B) is larger than or equal to G, wherein G is the transition band of the radio frequency band-pass filter, and Sa is the sampling rate.
5. The method of claim 3, wherein the digital up-converting the signals of the in-phase component and the quadrature component comprises:
the signal of the in-phase component and the signal of the quadrature component are multiplied by cos [ (Wn) n ] and sin [ (Wn) n ], respectively.
6. The method of claim 3, wherein prior to the processing of digitally upconverting the signals of the in-phase component and the quadrature component based on the determined digital frequency of the digital upconverting, further comprising:
interpolation processing is performed on the signal of the in-phase component and the signal of the quadrature component.
7. The method of claim 6, wherein the interpolating the signals of the in-phase component and the quadrature component is performed by:
and judging whether the signals of the in-phase component and the orthogonal component need to be interpolated, and when the sampling point rate does not meet the Nyquist sampling theorem or the band-pass sampling theorem, performing interpolation on the signals of the in-phase component and the orthogonal component.
8. The method of claim 1, wherein the filtering of the in-phase component if signal and the quadrature component if signal is performed in whole or in part as follows:
and filtering the intermediate frequency signal of the in-phase component and the intermediate frequency signal of the quadrature component by using a digital filter, completely or partially filtering one sideband of the intermediate frequency signal of the in-phase component and one sideband of the intermediate frequency signal of the quadrature component, and adding the two paths of signals subjected to filtering processing.
9. The method of claim 1,
and performing digital-to-analog conversion on the filtered intermediate frequency signal: inputting the intermediate frequency signal after filtering processing into a digital-to-analog converter for digital-to-analog conversion;
the up-conversion frequency mixing processing on the analog baseband signal comprises the following steps: performing up-conversion frequency mixing processing on the analog baseband signal by using a frequency mixer;
the transmission after the radio frequency signal is filtered and amplified is as follows: and filtering the radio frequency signal by using a band-pass filter to obtain a modulated single-sideband radio frequency signal or a vestigial sideband radio frequency signal, amplifying the modulated single-sideband radio frequency signal or the modulated vestigial sideband radio frequency signal, and finally feeding the amplified single-sideband radio frequency signal to an antenna for transmitting.
10. A processing system for implementing quadrature modulated signals, the system comprising: a digital frequency converter and a digital filter; wherein,
the digital frequency converter is used for carrying out digital up-conversion processing on the signals of the in-phase component and the orthogonal component to obtain intermediate frequency signals of the in-phase component and intermediate frequency signals of the orthogonal component;
and the digital filter is used for completely filtering or partially filtering one sideband of the intermediate frequency signal of the in-phase component and the intermediate frequency signal of the quadrature component to obtain the intermediate frequency signal after filtering processing.
11. The system of claim 10, further comprising: digital-to-analog converter, mixer, band-pass filter, amplifier, antenna; wherein,
the digital-to-analog converter is used for performing digital-to-analog conversion on the filtered intermediate frequency signal to obtain an analog baseband signal;
the frequency mixer is used for carrying out up-conversion frequency mixing processing on the analog baseband signal to obtain a radio frequency signal;
a band-pass filter for filtering the radio frequency signal;
the amplifier is used for amplifying the filtered radio frequency signal;
and the antenna is used for transmitting the radio frequency signal after the amplification processing.
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| CN107395548A (en) * | 2017-08-02 | 2017-11-24 | 中国工程物理研究院电子工程研究所 | A kind of qam signal launching technique based on array antenna |
| CN107994954A (en) * | 2017-11-28 | 2018-05-04 | 中国电子科技集团公司第五十四研究所 | A kind of orthogonal demodulation signal generating means for simulating Doppler's change |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106911604A (en) * | 2017-04-24 | 2017-06-30 | 深圳市统先科技股份有限公司 | The demodulation method and device of modulated intermediate frequency signal |
| CN106911604B (en) * | 2017-04-24 | 2020-04-10 | 深圳市统先科技股份有限公司 | Demodulation method and device of intermediate frequency modulation signal |
| CN107395548A (en) * | 2017-08-02 | 2017-11-24 | 中国工程物理研究院电子工程研究所 | A kind of qam signal launching technique based on array antenna |
| CN107395548B (en) * | 2017-08-02 | 2020-05-05 | 中国工程物理研究院电子工程研究所 | QAM modulation signal transmitting method based on array antenna |
| CN107994954A (en) * | 2017-11-28 | 2018-05-04 | 中国电子科技集团公司第五十四研究所 | A kind of orthogonal demodulation signal generating means for simulating Doppler's change |
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