CN113992488B - Radio frequency single sideband modulation method and radio frequency single sideband modulator - Google Patents
Radio frequency single sideband modulation method and radio frequency single sideband modulator Download PDFInfo
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Abstract
According to the radio frequency single sideband modulation method and the radio frequency single sideband modulator, a first local oscillation signal and a second local oscillation signal can be obtained, wherein the frequency difference between the second local oscillation signal and the first local oscillation signal is equal to the modulation frequency of a preset modulation signal; performing first mixing processing and filtering on the first local oscillator signal and a preset carrier signal to obtain a target frequency signal; and performing second mixing processing and filtering on the target frequency signal and the second local oscillation signal to obtain a target single sideband modulation signal. According to the method, the frequency of the modulation signal is embodied on the frequency difference of the two local oscillation signals, and the image interference suppression capability of the radio frequency single-sideband modulation can be greatly improved on the basis of the modulation signal with small frequency through two-stage mixing and filtering processing.
Description
Technical Field
The disclosure relates to the field of communication technologies, and in particular, to a radio frequency single sideband modulation method and a radio frequency single sideband modulator.
Background
In modern radar and communication applications, the carrier frequency of radio frequency signals is in the range of hundreds of MHz to 100GHz, and the frequency range of small frequency modulated signals is typically in the range of tens of Hz to 2 MHz. Since the frequency difference of the two sideband signals of the radio frequency signal is usually within 4MHz, the ratio of the two sideband signals to the carrier frequency is between 0.04 per mill and 4 percent, and the two sideband signals are easy to be subjected to image interference in practical application.
Since the spectrum of the radio frequency signal includes upper and lower sidebands, both sidebands contain the spectral components of the signal. The image frequency can be removed through single sideband modulation, only one sideband is reserved, and in the practical communication field, the transmission efficiency can be improved, the interference frequency can be removed, and the image interference can be restrained, so that how to realize the radio frequency single sideband modulation of a modulation signal on a small frequency becomes a technical problem which needs to be solved by a person skilled in the art.
Disclosure of Invention
In view of the above, the present disclosure provides a radio frequency single sideband modulation method and a radio frequency single sideband modulator for overcoming the above problems or at least partially solving the above problems, and the technical solutions are as follows:
a radio frequency single sideband modulation method comprising:
obtaining a first local oscillator signal and a second local oscillator signal, wherein the frequency difference between the second local oscillator signal and the first local oscillator signal is equal to the modulation frequency of a preset modulation signal;
performing first mixing processing and filtering on the first local oscillator signal and a preset carrier signal to obtain a target frequency signal;
and performing second mixing processing and filtering on the target frequency signal and the second local oscillation signal to obtain a target single sideband modulation signal.
Optionally, the performing first mixing processing and filtering on the first local oscillator signal and a preset carrier signal to obtain a target frequency signal includes:
performing down-mixing processing on the first local oscillator frequency and a preset carrier signal to obtain a first mixed output signal, wherein the first mixed output signal comprises a first high-stage image frequency and a first low-stage image frequency;
and performing first band-pass filtering processing on the first mixed output signal to obtain a target frequency signal.
Optionally, the performing a first band-pass filtering process on the first mixed output signal to obtain a target frequency signal includes:
and filtering the first high-stage image frequency in the first mixed output signal by using a first preset target frequency to obtain a first low-frequency signal, and determining the first low-frequency signal as a target frequency signal.
Optionally, the performing second mixing processing and filtering on the target frequency signal and the second local oscillation signal to obtain a target single sideband modulation signal includes:
performing up-mixing processing on the target frequency signal and the second local oscillator signal to obtain a second mixed output signal, wherein the second mixed output signal comprises a second high Duan Jingxiang frequency and a second low-stage image frequency;
and performing second band-pass filtering processing on the second mixed output signal to obtain a target single-sideband modulation signal.
Optionally, performing a second bandpass filtering process on the second mixed output signal to obtain a target single sideband modulated signal, including:
and filtering the second low-stage image frequency in the second mixed output signal by using a second preset target frequency to obtain a first high-frequency signal, and determining the first high-frequency signal as a target single-sideband modulation signal.
Optionally, after the obtaining the target frequency signal, the method further includes:
and amplifying the signal strength of the target frequency signal according to a first preset amplification strength to compensate for insertion loss generated by the first mixing process and the first band-pass filtering process, wherein the first preset amplification strength is determined according to the sum of the frequency conversion loss of the down mixing process and the interpolation loss of the first band-pass filtering process.
Optionally, after the obtaining the target single sideband modulated signal, the method further comprises:
amplifying the signal strength of the target single-sideband modulation signal according to a second preset amplification strength to compensate for insertion loss generated by the second mixing process and the second bandpass filtering process, wherein the second preset amplification strength is determined according to the sum of the frequency conversion loss of the up-mixing process in the second mixing process and the interpolation loss of the second bandpass filtering process.
Optionally, the frequencies of the first local oscillation signal and the second local oscillation signal are lower than the frequency of the preset carrier signal.
A radio frequency single sideband modulator, the radio frequency single sideband modulator comprising: the frequency synthesis module comprises a first local oscillation signal source and a second local oscillation signal source,
the first local oscillation signal source is used for outputting a first local oscillation signal;
the second local oscillation signal source is configured to output a second local oscillation signal according to the first local oscillation signal and the preset modulation signal, where a frequency difference between the second local oscillation signal and the first local oscillation signal is equal to a modulation frequency of the preset modulation signal;
the first mixing filtering module is used for performing first mixing processing and filtering on the first local oscillation signal and a preset carrier signal to obtain a target frequency signal;
and the second mixing filtering module is used for carrying out second mixing processing and filtering on the target frequency signal and the second local oscillation signal to obtain a target single sideband modulation signal.
Optionally, the first mixing filter module comprises a first mixer and a first band-pass filter, the second mixing filter module comprises a second mixer and a second band-pass filter,
the first mixer is configured to perform a down-mixing process on the first local oscillation frequency and a preset carrier signal, so as to obtain a first mixed output signal, where the first mixed output signal includes a first high-stage image frequency and a first low-stage image frequency;
the first band-pass filter is used for performing first band-pass filtering processing on the first mixed output signal to obtain a target frequency signal;
the second mixer is configured to perform up-mixing processing on the target frequency signal and the second local oscillator signal to obtain a second mixed output signal, where the second mixed output signal includes a second high Duan Jingxiang frequency and a second low-stage image frequency;
and the second band-pass filter is used for carrying out second band-pass filtering processing on the second mixed output signal to obtain a target single-sideband modulation signal.
By means of the technical scheme, the radio frequency single sideband modulation method and the radio frequency single sideband modulator can obtain the first local oscillation signal and the second local oscillation signal, wherein the frequency difference between the second local oscillation signal and the first local oscillation signal is equal to the modulation frequency of a preset modulation signal; performing first mixing processing and filtering on the first local oscillator signal and a preset carrier signal to obtain a target frequency signal; and performing second mixing processing and filtering on the target frequency signal and the second local oscillation signal to obtain a target single sideband modulation signal. According to the method, the frequency of the modulation signal is embodied on the frequency difference of the two local oscillation signals, and the image interference suppression capability of the radio frequency single-sideband modulation can be greatly improved on the basis of the modulation signal with small frequency through two-stage mixing and filtering processing.
The foregoing description is merely an overview of the technical solutions of the present disclosure, and may be implemented according to the content of the specification in order to make the technical means of the present disclosure more clearly understood, and in order to make the above and other objects, features and advantages of the present disclosure more clearly understood, the following specific embodiments of the present disclosure are specifically described.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the disclosure. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 is a schematic flow chart of an implementation of a radio frequency single sideband modulation method provided in an embodiment of the present disclosure;
fig. 2 is a schematic flow chart of another implementation of a radio frequency single sideband modulation method provided by an embodiment of the present disclosure;
fig. 3 is a schematic flow chart of another implementation of a radio frequency single sideband modulation method provided by an embodiment of the present disclosure;
fig. 4 is a schematic flow chart of another implementation of a radio frequency single sideband modulation method provided by an embodiment of the present disclosure;
fig. 5 is a schematic flow chart of another implementation of a radio frequency single sideband modulation method provided by an embodiment of the present disclosure;
FIG. 6 shows a schematic diagram of a configuration of a radio frequency single sideband modulator provided by an embodiment of the present disclosure;
fig. 7 shows another schematic configuration of a radio frequency single sideband modulator provided by an embodiment of the present disclosure;
fig. 8 shows another schematic configuration of a radio frequency single sideband modulator provided by an embodiment of the present disclosure;
FIG. 9 illustrates a control block diagram for a radio frequency single sideband modulator provided by an embodiment of the present disclosure;
fig. 10 illustrates another control block diagram for a radio frequency single sideband modulator provided by an embodiment of the present disclosure.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As shown in fig. 1, a flowchart of an implementation manner of a radio frequency single sideband modulation method provided by an embodiment of the present disclosure may include:
s100, a first local oscillation signal and a second local oscillation signal are obtained, wherein the frequency difference between the second local oscillation signal and the first local oscillation signal is equal to the modulation frequency of a preset modulation signal.
The second local oscillation signal can be generated by adding a preset modulation signal on the basis of the first local oscillation signal. Since the small-frequency modulation signal is mainly an analog doppler frequency signal, the embodiment of the disclosure can preset the modulation frequency of the modulation signal according to the actual application scenario. In a usual case, the frequency of the modulated signal may be set to be within 2MHz, i.e. a modulated signal of a small frequency.
Specifically, the embodiment of the disclosure may implement frequency setting of the modulation signal in a programmable manner, so that a user sets and alters the frequency of the modulation signal, and sets the frequency of the second local oscillator signal in real time through a corresponding serial port, so as to generate the second local oscillator signal with a frequency difference with the first local oscillator signal being the modulation frequency of the preset modulation signal.
For ease of understanding, this is illustrated by way of example: assume that the modulation frequency of the preset modulation signal is f d The frequency of the first local oscillation signal is f Lo The frequency of the second local oscillation signal is f Lo +f d 。
According to the embodiment of the disclosure, the small-frequency modulation signal is embodied on the frequency difference between the second local oscillation signal and the first local oscillation signal, so that the subsequent two-stage mixing processing is facilitated, the capability of inhibiting image interference is realized on the basis of the small-frequency modulation signal, and the filter design of the mixing processing is also facilitated in the practical application environment.
S200, performing first mixing processing and filtering on the first local oscillator signal and a preset carrier signal to obtain a target frequency signal.
Optionally, the frequencies of the first local oscillator signal and the second local oscillator signal are lower than the frequency of the preset carrier signal. According to the embodiment of the disclosure, the frequency of the local oscillation signal is set to be lower than the frequency of the preset carrier signal, so that the filter design of the mixing process can be realized in an actual application environment. It may be appreciated that the embodiments of the present disclosure may select the frequency of the first local oscillator signal according to actual requirements.
The signal output by mixing the first local oscillation signal and the preset carrier signal may include two frequency components. The embodiment of the disclosure can select to filter one frequency and take the other frequency as the frequency of the target frequency signal.
Optionally, based on the radio frequency single sideband modulation method shown in fig. 1, as shown in fig. 2, a flowchart of another implementation of the radio frequency single sideband modulation method provided in the embodiment of the present disclosure may include:
s210, performing down-mixing processing on the first local oscillation frequency and a preset carrier signal to obtain a first mixed output signal, wherein the first mixed output signal comprises a first high-stage image frequency and a first low-stage image frequency.
S220, performing first band-pass filtering processing on the first mixed output signal to obtain a target frequency signal.
After the first local oscillator signal and the preset carrier signal are subjected to the down-mixing processing, the obtained first mixed output signal contains two frequency components, one frequency in the first mixed output signal is filtered through the first band-pass filtering processing, and a target frequency signal containing the other unfiltered frequency is obtained. For ease of understanding, this is illustrated by way of example: assume that the frequency of the preset carrier signal is f c The frequency of the first local oscillation signal is f Lo The first mixed output signal includes a first low-stage image frequency f c -f Lo And a first high-stage image frequency f c +f Lo The frequency of the target frequency signal may be f c -f Lo Or f c +f Lo 。
Optionally, based on the radio frequency single sideband modulation method shown in fig. 2, as shown in fig. 3, a flowchart of another implementation of the radio frequency single sideband modulation method provided by the embodiment of the present disclosure may include:
s221, filtering a first high-stage image frequency in the first mixed output signal by using a first preset target frequency to obtain a first low-frequency signal, and determining the first low-frequency signal as a target frequency signal.
The first preset target frequency may be a preset filtered frequency. The disclosed embodiments may set the high Duan Jingxiang frequency in the first mixed output signal to a frequency that needs to be filtered out. According to the embodiment of the disclosure, the high Duan Jingxiang frequency in the first mixed output signal is filtered, the low-stage image frequency is reserved, and the required first low-frequency signal is obtained. For ease of understanding, this is illustrated by way of example: assume that the first mixed output signal includes a first low-stage image frequency f c -f Lo And a first high-stage image frequency f c +f Lo At the first high-stage image frequency f c +f Lo Then, the frequency of the obtained target frequency signal is f i ＝f c -f Lo 。
According to the embodiment of the disclosure, the first high-stage image frequency is filtered, the first low-stage image frequency is reserved, the image interference suppression capability is realized on the basis of the small-frequency modulation signal, and meanwhile, the filter is simpler in design and better in link insertion loss performance in the practical application environment.
S300, performing second mixing processing and filtering on the target frequency signal and the second local oscillation signal to obtain a target single sideband modulation signal.
The signal output by mixing the target frequency signal and the second local oscillation signal may contain two frequency components. Embodiments of the present disclosure may choose to filter out one of the frequencies, with the remaining other frequency being the frequency of the target single sideband modulated signal.
Optionally, based on the radio frequency single sideband modulation method shown in fig. 1, as shown in fig. 4, a flowchart of another implementation of the radio frequency single sideband modulation method provided in the embodiment of the present disclosure may include:
s310, carrying out up-mixing processing on the target frequency signal and a second local oscillation signal to obtain a second mixed output signal, wherein the second mixed output signal comprises a second high Duan Jingxiang frequency and a second low-stage image frequency.
S320, performing second band-pass filtering processing on the second mixed output signal to obtain a target single-sideband modulation signal.
The second mixed output signal obtained after the up-mixing processing of the target frequency signal and the second local oscillation signal contains two frequency components, and one frequency in the second mixed output signal is filtered through the second band-pass filtering processing, so that a target single-sideband modulation signal containing the other unfiltered frequency is obtained. For ease of understanding, this is illustrated by way of example: assume that the frequency of the target frequency signal is f i The second local oscillation signal is f Lo +f d The second mixed output signal comprises a second high Duan Jingxiang frequency (f Lo +f d )+f i And a second low-stage image frequency (f Lo +f d )-f i The frequency of the target single sideband modulated signal may be (f Lo +f d )+f i Or (f) Lo +f d )-f i 。
Optionally, based on the radio frequency single sideband modulation method shown in fig. 4, as shown in fig. 5, step S320 may include:
s321, filtering a second low-stage image frequency in the second mixed output signal by using a second preset target frequency to obtain a first high-frequency signal, and determining the first high-frequency signal as a target single-sideband modulation signal.
The second preset target frequency may be a preset filtered frequency. The embodiment of the disclosure can set the low-stage image frequency in the second mixing output signal to be the frequency needing filtering. The target single sideband modulation signal with the frequency of second highest Duan Jingxiang frequency can be obtained by filtering the second low-stage image frequency in the second mixed output signal. For ease of understanding, this is illustrated by way of example: assuming that the second mixed output signal comprises a second low-stage image frequency (f Lo +f d )-f i And a second highest Duan Jingxiang frequency (f Lo +f d )+f i After filtering the second lower-stage image frequency (f Lo +f d )-f i Thereafter, the frequency of the obtained first high-frequency signal is (f Lo +f d )+f i Further from f i ＝f c -f Lo The frequency of availability is f c +f d Is a target single sideband modulated signal.
According to the radio frequency single sideband modulation method, the first local oscillation signal and the second local oscillation signal can be obtained, wherein the frequency difference between the second local oscillation signal and the first local oscillation signal is equal to the modulation frequency of the preset modulation signal; performing first mixing processing and filtering on the first local oscillation signal and a preset carrier signal to obtain a target frequency signal; and performing second mixing processing and filtering on the target frequency signal and the second local oscillation signal to obtain a target single sideband modulation signal. According to the method, the frequency of the modulation signal is embodied on the frequency difference of the two local oscillation signals, and the image interference suppression capability of the radio frequency single-sideband modulation can be greatly improved on the basis of the modulation signal with small frequency through two-stage mixing and filtering processing.
Because the mixing process introduces insertion loss during practical application, the signal strength of the signal obtained by the mixing process can be amplified to compensate for the insertion loss generated by the mixing process. For example: the insertion loss in the primary mixing process is 10dB, and the signal strength of the signal obtained by the primary mixing process may be amplified by 10dB according to the embodiment of the present disclosure.
Optionally, the embodiment of the disclosure may amplify the signal strength of the target frequency signal according to the first preset amplification strength after obtaining the target frequency signal, so as to compensate for the insertion loss generated by the first mixing process and the first band-pass filtering.
Specifically, the embodiment of the disclosure may determine the first preset amplification strength according to a sum of a frequency conversion loss of the down-mixing in the first mixing process and an interpolation loss of the first band-pass filtering process. For example: the frequency conversion loss of the down mixing is 8dB, the interpolation loss of the first band-pass filtering process is 2dB, and the first preset amplification intensity is 10dB.
Optionally, the embodiment of the disclosure may amplify the signal strength of the target single-sideband modulated signal according to the second preset amplification strength after obtaining the target single-sideband modulated signal, so as to compensate for insertion loss generated by the second mixing process and the second bandpass filtering.
Specifically, the embodiment of the disclosure may determine the second preset amplification intensity according to a sum of a conversion loss of the up-mixing in the second mixing process and an interpolation loss of the second band-pass filtering process. For example: the frequency conversion loss of the up-mixing is 8dB, the interpolation loss of the second band-pass filtering process is 2dB, and the second preset amplification intensity is 10dB.
According to the embodiment of the disclosure, the signal strength of the signal obtained after the mixing processing is amplified, so that the loss caused by the mixing processing can be compensated, and the signal output capability can be improved.
Although operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order. In certain circumstances, multitasking and parallel processing may be advantageous.
It should be understood that method embodiments of the present disclosure may include additional steps and/or omit performing the illustrated steps. The scope of the present disclosure is not limited in this respect.
Corresponding to the above method embodiment, a schematic structural diagram of a radio frequency single sideband modulator according to an embodiment of the present disclosure is shown in fig. 6, where the radio frequency single sideband modulator may include: the frequency synthesis module 100, the first mixing filtering module 200 and the second mixing filtering module 300, the frequency synthesis module 100 includes a first local oscillation signal source 110 and a second local oscillation signal source 120.
The first local oscillation signal source 110 is connected to the first mixing filtering module 200, the second local oscillation signal source 120 is connected to the second mixing filtering module 300, and the first mixing filtering module 200 is connected to the second mixing filtering module 300, so that a signal output by the first mixing filtering module 200 is input to the second mixing filtering module 300.
The first local oscillation signal source 110 is configured to output a first local oscillation signal.
The second local oscillation signal source 120 is configured to output a second local oscillation signal according to the first local oscillation signal and a preset modulation signal, where a frequency difference between the second local oscillation signal and the first local oscillation signal is equal to a modulation frequency of the preset modulation signal.
The first mixing filtering module 200 is configured to perform a first mixing processing and filtering on the first local oscillation signal and a preset carrier signal, so as to obtain a target frequency signal.
The second mixing filtering module 300 is configured to perform a second mixing processing and filtering on the target frequency signal and the second local oscillation signal, so as to obtain a target single sideband modulation signal.
Optionally, the frequencies of the first local oscillator signal and the second local oscillator signal are lower than the frequency of the preset carrier signal.
Alternatively, based on the apparatus shown in fig. 6, as shown in fig. 7, the first mixing filter module 200 may include a first mixer 210 and a first band pass filter 220, and the second mixing filter module 300 includes a second mixer 310 and a second band pass filter 320.
The first mixer 210 may be connected to the first local oscillation source 110, and the second mixer 310 may be connected to the second local oscillation source 120.
The first mixer 210 is configured to perform a down-mixing process on the first local oscillation frequency and a preset carrier signal to obtain a first mixed output signal, where the first mixed output signal includes a first high-stage image frequency and a first low-stage image frequency.
The first band-pass filter 220 is configured to perform a first band-pass filtering process on the first mixed output signal to obtain a target frequency signal.
Optionally, the first band-pass filter 220 may be specifically configured to filter the first high-stage image frequency in the first mixed output signal by using the first preset target frequency, obtain a first low-frequency signal, and determine the first low-frequency signal as the target frequency signal.
And a second mixer 310, configured to perform up-mixing processing on the target frequency signal and a second local oscillation signal, to obtain a second mixed output signal, where the second mixed output signal includes a second high Duan Jingxiang frequency and a second low-stage image frequency.
And a second band-pass filter 320, configured to perform a second band-pass filtering process on the second mixed output signal, so as to obtain a target single-sideband modulated signal.
Optionally, the second band-pass filter 320 may be specifically configured to filter the second low-stage image frequency in the second mixed output signal by using the second preset target frequency to obtain the first high-frequency signal, and determine the first high-frequency signal as the target single-sideband modulated signal.
The radio frequency single sideband modulator can obtain a first local oscillator signal and a second local oscillator signal, wherein the frequency difference between the second local oscillator signal and the first local oscillator signal is equal to the modulation frequency of a preset modulation signal; performing first mixing processing and filtering on the first local oscillation signal and a preset carrier signal to obtain a target frequency signal; and performing second mixing processing and filtering on the target frequency signal and the second local oscillation signal to obtain a target single sideband modulation signal. According to the method, the frequency of the modulation signal is embodied on the frequency difference of the two local oscillation signals, and the image interference suppression capability of the radio frequency single-sideband modulation can be greatly improved on the basis of the modulation signal with small frequency through two-stage mixing and filtering processing.
Optionally, the radio frequency single sideband modulator may also include a first amplifier 400.
The first amplifier 400 is configured to amplify, after the first mixing filtering module 200 obtains the target frequency signal, the signal strength of the target frequency signal according to a first preset amplification strength to compensate for insertion loss generated by the first mixing process and the first band-pass filtering process, where the first preset amplification strength is determined according to a sum of a frequency conversion loss of the down-mixing process and an interpolation loss of the first band-pass filtering process in the first mixing process.
Optionally, the radio frequency single sideband modulator may also include a second amplifier 500.
And a second amplifier 500 for amplifying the signal strength of the target single sideband modulated signal according to a second preset amplification strength after the second mixing filtering module 300 obtains the target single sideband modulated signal to compensate for the insertion loss generated by the second mixing process and the second bandpass filtering, wherein the second preset amplification strength is determined according to the sum of the frequency conversion loss of the up-mixing in the second mixing process and the insertion loss of the second bandpass filtering process.
The structure of the rf single-sideband modulator provided in the embodiments of the present disclosure when the rf single-sideband modulator includes the first amplifier 400 and the second amplifier 500 may be as shown in fig. 8. According to the embodiment of the disclosure, the signal strength of the signal obtained after the mixing processing is amplified, so that the loss caused by the mixing processing can be compensated, and the signal output capability can be improved.
To facilitate an understanding of the solution provided by the embodiments of the present disclosure in its entirety, a control block diagram of an rf single sideband modulator is described herein in connection with fig. 9: the frequency synthesis module 100 generates two local oscillation signals, wherein the frequency of the local oscillation signal 1 is f Lo The frequency of the local oscillation signal 2 is the frequency f of the local oscillation signal 1 Lo On the basis of which the frequency f of the modulated signal is added d I.e. f Lo +f d . The frequency of the signal output after the local oscillation signal 1 and the carrier signal are mixed downwards and band-pass filtered is f c -f Lo Will beFrequency f c -f Lo The frequency of the signal output after up-mixing with the local oscillation signal 2 and band-pass filtering is f c +f d The frequency is f c +f d Is the desired single sideband modulated signal.
In practice, an amplifier may be added to the rf single sideband modulator to compensate for the loss due to mixing and bandpass filtering. Fig. 10 shows another control block diagram of the rf single sideband modulator after addition of an amplifier, based on fig. 9. The frequency of the local oscillator signal 2 is determined by the frequency control word of the local oscillator signal 1 and the configurable modulation signal.
In this disclosure, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Features described in various embodiments of the disclosure may be interchanged or combined, and like parts of the various embodiments may be identified with each other, such that each embodiment is identified with a different element than other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A method of radio frequency single sideband modulation comprising:
obtaining a first local oscillator signal and a second local oscillator signal, wherein the frequency difference between the second local oscillator signal and the first local oscillator signal is equal to the modulation frequency of a preset modulation signal;
performing down-mixing processing on the first local oscillation frequency and a preset carrier signal to obtain a first mixed output signal, wherein the first mixed output signal comprises a first high-stage image frequency and a first low-stage image frequency;
performing first band-pass filtering processing on the first mixed output signal to obtain a target frequency signal;
performing up-mixing processing on the target frequency signal and the second local oscillator signal to obtain a second mixed output signal, wherein the second mixed output signal comprises a second high Duan Jingxiang frequency and a second low-stage image frequency;
and performing second band-pass filtering processing on the second mixed output signal to obtain a target single-sideband modulation signal.
2. The method of claim 1, wherein said performing a first band pass filtering process on said first mixed output signal to obtain a target frequency signal comprises:
and filtering the first high-stage image frequency in the first mixed output signal by using a first preset target frequency to obtain a first low-frequency signal, and determining the first low-frequency signal as a target frequency signal.
3. The method of claim 1, wherein performing a second bandpass filtering process on the second mixed output signal to obtain a target single sideband modulated signal comprises:
and filtering the second low-stage image frequency in the second mixed output signal by using a second preset target frequency to obtain a first high-frequency signal, and determining the first high-frequency signal as a target single-sideband modulation signal.
4. The method of claim 1, wherein after the obtaining the target frequency signal, the method further comprises:
and amplifying the signal strength of the target frequency signal according to a first preset amplification strength to compensate for insertion loss generated by the first mixing process and the first band-pass filtering process, wherein the first preset amplification strength is determined according to the sum of the frequency conversion loss of the down mixing process and the interpolation loss of the first band-pass filtering process.
5. The method of claim 1, wherein after the obtaining the target single sideband modulated signal, the method further comprises:
amplifying the signal strength of the target single-sideband modulation signal according to a second preset amplification strength to compensate for insertion loss generated by the second mixing process and the second bandpass filtering process, wherein the second preset amplification strength is determined according to the sum of the frequency conversion loss of the up-mixing process in the second mixing process and the interpolation loss of the second bandpass filtering process.
6. The method of claim 1, wherein the first and second local oscillator signals have frequencies that are lower than the frequency of the predetermined carrier signal.
7. A radio frequency single sideband modulator, the radio frequency single sideband modulator comprising: the frequency synthesis module comprises a first local oscillation signal source and a second local oscillation signal source,
the first local oscillation signal source is used for outputting a first local oscillation signal;
the second local oscillation signal source is used for outputting a second local oscillation signal according to the first local oscillation signal and a preset modulation signal, wherein the frequency difference between the second local oscillation signal and the first local oscillation signal is equal to the modulation frequency of the preset modulation signal;
the first mixing filtering module is used for performing first mixing processing and filtering on the first local oscillation signal and a preset carrier signal to obtain a target frequency signal;
the second mixing filtering module is configured to perform second mixing processing and filtering on the target frequency signal and the second local oscillation signal to obtain a target single sideband modulation signal;
the first mixing filter module comprises a first mixer and a first band-pass filter, the second mixing filter module comprises a second mixer and a second band-pass filter,
the first mixer is configured to perform a down-mixing process on a first local oscillation frequency and a preset carrier signal to obtain a first mixed output signal, where the first mixed output signal includes a first high-stage image frequency and a first low-stage image frequency;
the first band-pass filter is used for performing first band-pass filtering processing on the first mixed output signal to obtain a target frequency signal;
the second mixer is configured to perform up-mixing processing on the target frequency signal and the second local oscillator signal to obtain a second mixed output signal, where the second mixed output signal includes a second high Duan Jingxiang frequency and a second low-stage image frequency;
and the second band-pass filter is used for carrying out second band-pass filtering processing on the second mixed output signal to obtain a target single-sideband modulation signal.
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