CN112953879A - Directly modulated digital transmitter and modulation transmitting method of transmitter - Google Patents
Directly modulated digital transmitter and modulation transmitting method of transmitter Download PDFInfo
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- CN112953879A CN112953879A CN202110361204.8A CN202110361204A CN112953879A CN 112953879 A CN112953879 A CN 112953879A CN 202110361204 A CN202110361204 A CN 202110361204A CN 112953879 A CN112953879 A CN 112953879A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/365—Modulation using digital generation of the modulated carrier (not including modulation of a digitally generated carrier)
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3818—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The embodiment of the invention discloses a directly modulated digital transmitter and a modulation transmitting method of the transmitter, wherein the transmitter comprises the following components: the device comprises an oscillation module and a modulation transmitting module; the oscillation module is used for generating local oscillation signals of N phases; the modulation transmitting module comprises: the modulation transmitting module is used for driving one output unit through the local oscillator signal of each phase to complete amplitude modulation: controlling the opening number K of the subunits in the corresponding output unit of each phase based on the original code stream so as to control the weight of the output signal of each phase to complete amplitude modulation; and the modulation transmitting module is also used for synthesizing the modulation signals of the positive QAM and transmitting the modulation signals through an antenna after carrying out logic operation on the output signals of the N output units. The directly modulated digital transmitter and the modulation transmitting method of the transmitter provided by the embodiment of the invention can reduce power consumption.
Description
Technical Field
The present invention relates to, but not limited to, the field of communications, and in particular, to a directly modulated digital transmitter and a modulation transmission method of the transmitter.
Background
In recent years, communication technology is rapidly developed, people have higher and higher requirements on wireless transmission data rate, and bandwidth becomes a main bottleneck. The millimeter wave band has a wide application in a broadband system because of its high carrier frequency.
Fig. 1 is a schematic diagram of a conventional transmitter, and as shown in fig. 1, in the conventional transmitter architecture, a communication system is divided into a digital baseband and a radio frequency transmitter, the digital baseband modulates an original digital signal, the digital signal is converted into an analog signal by a digital-to-analog converter (DAC), and the analog signal is modulated onto a high frequency carrier by the radio frequency transmitter and then transmitted. That is, the conventional transmitter is implemented according to the following principle: original code stream-digital domain modulation-digital-analog conversion-analog up-conversion-power amplification and transmission
In the conventional application, the bandwidth of a signal is relatively narrow, the clock frequency of a digital baseband is relatively low, and generally only tens of MHz is provided, so that the power consumption of a radio frequency transmitter in the whole communication system is relatively high (hundreds of mW), and the power consumption of the digital baseband is relatively low (tens of mW). In addition, the power consumption of the digital baseband part is positively correlated with the clock frequency, and the higher the clock frequency is, the larger the power consumption of the digital baseband is. In high-speed applications, the signal bandwidth is relatively wide, and the clock frequency of the digital baseband part is relatively high, so that the power consumption is greatly increased.
Disclosure of Invention
In a first aspect, an embodiment of the present application provides a directly modulated digital transmitter, including: the device comprises an oscillation module and a modulation transmitting module;
the oscillation module is used for generating local oscillation signals with N phases, wherein N is an integer greater than or equal to 2;
the modulation transmitting module comprises: the modulation transmitting module is used for driving one output unit through the local oscillation signal of each phase to complete amplitude modulation; each output unit comprises M subunits, wherein M is a positive integer;
the modulation transmitting module drives an output unit through the local oscillation signal of each phase to complete amplitude modulation, and the modulation transmitting module comprises: controlling the opening number K of the subunits in the corresponding output unit of each phase based on the original code stream so as to control the weight of the output signal of each phase to complete amplitude modulation; the opening quantity K is the number of constellation points of the original code stream corresponding to the QAM constellation diagram;
and the modulation transmitting module is also used for synthesizing the QAM modulation signal and transmitting the QAM modulation signal through an antenna after carrying out logic operation on the output signals of the N output units.
In a second aspect, an embodiment of the present application provides a modulation transmission method of a transmitter, including:
generating local oscillation signals of N phases, wherein N is an integer greater than or equal to 2;
driving an output unit by the local oscillation signal of each phase to complete amplitude modulation; each output unit comprises M subunits, wherein M is a positive integer;
driving an output unit by a local oscillator signal of each phase to perform amplitude modulation, comprising: controlling the opening number K of the subunits in the corresponding output unit of each phase based on the original code stream so as to control the weight of the output signal of each phase to complete amplitude modulation; the opening quantity K is the number of constellation points of the original code stream corresponding to the QAM constellation diagram;
and after carrying out logic operation on the output signals of the N output units, synthesizing the QAM modulation signals and transmitting the QAM modulation signals through an antenna.
Compared with the prior art, the directly modulated digital transmitter and the modulation transmission method of the transmitter provided by at least one embodiment of the application have the following beneficial effects: the modulation can be realized in a radio frequency chip through QAM, an original code stream is directly converted into radio frequency through digital up-conversion, the modulation function which is originally required to be carried out in a digital baseband can be realized in the radio frequency chip in a low power consumption mode, the power consumption of the whole communication system is greatly reduced, and the integration level of the system is improved.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.
Drawings
The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
Fig. 1 is a schematic diagram of a conventional transmitter architecture;
fig. 2 is a schematic structural diagram of a directly modulated digital transmitter according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an architecture of a direct modulation digital transmitter according to an embodiment of the present invention;
fig. 4 is a constellation diagram of 16QAM according to an embodiment of the present invention;
fig. 5 is a system block diagram of a modulation part of a transmitter according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a direct modulation digital transmitter implementation provided by an embodiment of the present invention;
FIG. 7 is a diagram illustrating spectral shaping provided by an embodiment of the present invention;
fig. 8 is a flowchart of a modulation transmission method of a transmitter according to an embodiment of the present invention.
Detailed Description
The present application describes embodiments, but the description is illustrative rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or instead of any other feature or element in any other embodiment, unless expressly limited otherwise.
The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in this application may also be combined with any conventional features or elements to form a unique inventive concept as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive aspects to form yet another unique inventive aspect, as defined by the claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not limited except as by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.
Further, in describing representative embodiments, the specification may have presented the method and/or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. Other orders of steps are possible as will be understood by those of ordinary skill in the art. Therefore, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Further, the claims directed to the method and/or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present application.
Fig. 2 is a schematic structural diagram of a direct modulation digital transmitter according to an embodiment of the present invention, and fig. 3 is a schematic structural diagram of a direct modulation digital transmitter according to an embodiment of the present invention, as shown in fig. 2 and fig. 3, the direct modulation digital transmitter according to this embodiment may include: an oscillation module 21 and a modulation transmission module 22.
In this embodiment, a directly modulated digital transmitter is provided, which is a directly modulated radio frequency, millimeter wave, or terahertz digital transmitter supporting high-order modulation, and can directly modulate an original code stream to a radio frequency, amplify, and transmit the original code stream, compared with a conventional method: the original code stream → the digital domain is modulated → the DA is converted into an analog signal → analog up-conversion (frequency mixing) → power amplification and emission, thereby avoiding the traditional analog up-conversion and RF-DAC with larger power consumption, solving the problem of larger power consumption of the digital part in a high-speed communication system and greatly simplifying the architecture. That is, this embodiment can realize the function of modulation that should carry out originally in the digital baseband with the mode of low-power consumption in the radio frequency chip, greatly reduced whole communication system's consumption, promote the integrated level of system simultaneously.
In this embodiment, Modulation may be implemented in a radio frequency chip by Quadrature Amplitude Modulation (QAM for short), and an original code stream is directly subjected to digital up-conversion to a radio frequency. The QAM uses two independent baseband signals to carry out carrier-restraining double-sideband amplitude modulation on two mutually orthogonal same-frequency carriers, and realizes the transmission of two paths of parallel digital information by utilizing the orthogonality of the frequency spectrum of the modulated signals in the same bandwidth.
In this embodiment, a modulation scheme of N × N QAM may be supported, where N is an integer greater than or equal to 2, and the modulation and the transmission of signals are also realized. Where N is 4, 6, or 8, that is, the transmitter of this embodiment may support high-order modulation such as 16QAM, 64QAM, or 256QAM, and thus, the problem of large power consumption of the digital part in the high-speed communication system is solved.
The implementation principles of 16QAM, 64QAM, and 256QAM are similar, and this embodiment and the following embodiments use an N-4 modulation mode, that is, 16QAM as an example for explanation, and the implementation principles of 64QAM and 256QAM are similar to the implementation principle of 16QAM, and are not described in detail in this embodiment.
And the oscillation module is used for generating local oscillation signals of N phases, wherein N is an integer greater than or equal to 2.
In this embodiment, the phase N of the local oscillation signal to be generated may be determined according to the constellation diagram of QAM. Taking 16QAM as an example, fig. 4 is a constellation diagram of 16QAM provided in the embodiment of the present invention, as shown in fig. 4, from the constellation diagram of 16QAM, 16QAM has 16 constellation points, and 4 quadrants are provided in total, and each quadrant has 4 constellation points. One quadrant can correspond to one phase, and a local oscillation signal with four phases can be generated by the oscillation module, that is, N is 4. For 16QAM signals, each constellation point is equivalent to vector synthesis of an I path signal with 3 times of weight and a Q path signal with 1 time of weight, or vector synthesis of the Q path signal with 3 times of weight and the I path signal with 1 time of weight.
Similar to the 16QAM constellation diagram, for the 64QAM constellation diagram, an eight-phase local oscillator signal may be generated by the oscillation module, that is, N is 8. For a 256QAM constellation, a sixteen-phase local oscillator signal, i.e., N-16, may be generated by the oscillation module.
In this embodiment, the implementation principle of generating the local oscillation signal by using the oscillation module is the same as that in the prior art, for example, the four-phase signal generation may be implemented by using a conventional quadrature local oscillation circuit, and a typical implementation method may include generating the quadrature signal by using a quadrature oscillator, a quadrature injection locked oscillator, a Poly-phase filter (passive polyphase filter), a passive hybrid (quadrature coupler), and the like. Eight-phase signals or sixteen-phase signals may be implemented with injection-locked coupled oscillators.
In one example, N-4, the local oscillator signal with N phase may include: an in-phase I signal (I +), a quadrature Q signal (Q +), an inverted I signal (I-) and an inverted Q signal (Q-).
In this embodiment, the radio frequency chip may generate four-phase local oscillators, and the four-phase local oscillators correspond to a positive direction (0 °) of the I path (0 °), a positive direction (90 °), a negative direction (180 °) of the I path (90 °), and a negative direction (270 °) of the Q path, respectively.
Fig. 5 is a system block diagram of a modulation part of a transmitter according to an embodiment of the present invention, and as shown in fig. 5, a modulation transmitting module may include: the modulation transmitting module is used for driving one output unit through the local oscillation signal of each phase to complete amplitude modulation; each output unit comprises M subunits, wherein M is a positive integer.
In this embodiment, the original code stream may be used to control the multi-phase local oscillation signal generated by the oscillation module, and then synthesized at the output end, thereby forming a modulation signal that can be directly transmitted.
The modulation transmitting module drives an output unit by the local oscillator signal of each phase to complete amplitude modulation, and may include: controlling the opening number K of subunits in a corresponding output unit of each phase (or phase branch) based on the original code stream so as to control the weight of an output signal of each phase (or phase branch) to complete amplitude modulation; and the opening quantity K is the number of constellation points of the original code stream corresponding to the QAM constellation diagram.
And the modulation transmitting module is also used for synthesizing the QAM modulation signal and transmitting the QAM modulation signal through an antenna after carrying out logic operation on the output signals of the N output units.
The phase branch is used for transmitting a phase local oscillator signal. The N-phase local oscillator signal generated by the oscillation module may be split into different phases by a splitter (e.g., an I/Q splitter), where each split is a phase branch, and each phase branch is used to transmit a local oscillator signal of one phase.
In this embodiment, the weights of the phase branches are different for different constellation points. By controlling the opening number of the subunits in the output unit, different weights of different phase branches (or output signals of different phases) are realized, so that the original code stream is directly modulated and emitted, and the architecture is greatly simplified. The opening number K of the subunits in the corresponding output unit of each phase can be controlled based on the original code stream so as to control the weight of the output signal of each phase, thereby completing amplitude modulation.
Taking four-phase local oscillation signals as an example, each phase local oscillation signal is one path, the four paths of local oscillation signals are used for driving four groups of output units, each path of local oscillation signal respectively drives one group of output units, the opening number K of the sub units in each output unit is controlled by an original code stream (also called baseband data), each output unit is controlled by the original code stream to complete amplitude modulation, and the four groups of output units finally complete data modulation by vector synthesis (superposition) and realize signal output.
Taking an original code stream as 0011 and a four-phase local oscillation signal including an in-phase I signal (I +), a quadrature Q signal (Q +), an inverse I signal (I-) and an inverse Q signal (Q-) as an example, a 16 QAM-based constellation diagram shows that: 11 of the original code streams 0011 corresponds to that I + of the 16QAM constellation is 3, and 01 of the original code streams 0011 corresponds to that Q + of the 16QAM constellation is 1. Controlling the opening number K of the subunits in the I + phase corresponding output unit to be 3 based on the constellation points (+3 and +1) of the original code stream 0011 in the 16QAM constellation diagram, namely enabling the I + phase to correspond to 3 subunits in the output unit; and controlling the number of on sub-units K in the Q + phase corresponding output unit to be 1, i.e., enabling 1 sub-unit in the Q + phase corresponding output unit. And then synthesizing vectors of 3 subunits in the I + phase corresponding output unit and 1 subunit in the Q + phase corresponding output unit, completing data modulation and realizing signal output.
The direct modulation digital transmitter provided by the embodiment of the invention can realize modulation in a radio frequency chip through QAM, directly convert an original code stream to radio frequency through digital up-conversion, and realize the modulation function originally to be carried out in a digital baseband in a low power consumption mode in the radio frequency chip, thereby greatly reducing the power consumption of the whole communication system and simultaneously improving the integration level of the system.
In an exemplary embodiment of the present invention, the directly modulated digital transmitter may further include a power amplification module, the modulation and transmission module is integrated in the power amplification module, and the power amplification module is configured to perform power amplification on the modulated signal and then transmit the modulated signal through an antenna.
Wherein the power amplifying module may include a power amplifier.
In this embodiment, the modulation and transmission module is integrated in the power amplification module, the modulation and the transmitter can be combined in a Power Amplifier (PA), and the original code stream can be directly modulated to a radio frequency, amplified and transmitted, thereby greatly reducing the complexity of the transmitter. The modulation transmission principle of the transmitter is as follows: original code stream → digital up-conversion and modulation → power amplification and transmission.
In addition, the modulation and transmitter are combined in a PA, which is a single-stage system and is easy to achieve relative bandwidth of more than 40%. And the local oscillator signal is a single-tone signal, so the pre-stage buffer amplifier is easy to design and implement.
Fig. 6 is a schematic diagram of an implementation manner of a directly modulated digital transmitter according to an embodiment of the present invention, and as shown in fig. 6, a cascode transistor array is an implementation manner of the transmitter according to this embodiment, an upper NMOS transistor is a local oscillator signal output, and a lower NMOS transistor is a data input. The local oscillator signal has multiple phases (four phases are taken as an example in fig. 6: 0 degrees, 90 degrees, 180 degrees, and 270 degrees), and the weights of the phase branches are different for different constellation points. The branch circuits with different phases have different weights by controlling the opening number of the subunits in the output unit, thereby completing modulation. Meanwhile, the cascode transistor array is matched with the output matching network to also finish the functions of amplification and output matching.
In practical applications, the conventional transmitter shown in fig. 1 requires multiple levels of link concatenation, which results in limited bandwidth, the PA needs to operate in a linear region, power backoff is required to reduce the energy efficiency ratio, and configurability is weak. The transmitter provided by the embodiment of the invention can directly modulate the original code stream to the radio frequency, and realizes modulation and amplification through the primary circuit, thereby simplifying the structure and avoiding the bandwidth limitation caused by multi-stage amplification; the PA can work in a switch module, the energy efficiency ratio is improved without power backspacing, and the configurability is strong.
In an example embodiment of the present invention, the directly modulated digital transmitter may further include: and the frequency spectrum shaping module is used for receiving the local oscillation signals of the N phases generated by the oscillation module, performing up-sampling interpolation processing on the local oscillation signals of each phase, and sending the local oscillation signals subjected to the up-sampling interpolation processing to the modulation transmitting module.
In this embodiment, a mixed signal spectrum shaping technique may be proposed for a direct modulation digital transmitter to suppress side lobe signals so that the output spectrum of the transmitter satisfies spectrum mask regulations. The spectral mask specification means: different criteria define the output spectrum of the transmitter to be within a certain range beyond a certain value, such as how much dBc the side lobe is lower than the main lobe (e.g., 20 dBc). The spectrum mask is defined as the prior art, and this embodiment is not limited and described herein.
Fig. 7 is a schematic diagram of spectral shaping according to an embodiment of the present invention, and as shown in fig. 7, after an original code stream enters an I/Q splitter, the original code stream is first processed by a P-times up-sampling and interpolator, where P is a positive integer, and the image signal is frequency-shifted to improve the adjacent channel rejection ratio of the transmitter spectrum.
The N-phase local oscillator signal generated by the oscillation module may be split into different phases by a splitter (e.g., an I/Q splitter), where each split is a phase branch, and each phase branch is used to transmit a local oscillator signal of one phase. The implementation principle of the I/Q splitter is the same as that of the prior art, and this embodiment is not limited and described herein. The implementation principle of the upsampling interpolation is the same as that of the prior art, and the embodiment is not limited and described herein.
In an example, the spectrum shaping module is further configured to process an edge slew rate of the local oscillator signal after the upsampling and interpolation processing, and send the local oscillator signal after the edge slew rate processing to the modulation transmitting module.
In this embodiment, as shown in fig. 7, after an original code stream enters an I/Q splitter, the original code stream is first processed by a P-fold upsampling and interpolating device, where P is a positive integer, and the frequency of an image signal is pushed away to improve the adjacent channel rejection ratio of a transmitter spectrum; then the I path signal and the Q path signal after the up-sampling and the interpolation are processed by the edge slew rate, and the high frequency component is further reduced by the edge slow change to realize the frequency spectrum shaping of the transmitter.
The directly modulated digital transmitter provided by the embodiment of the invention has the following advantages: 1. the original code stream can be directly converted into radio frequency through digital up-conversion, so that the traditional analog up-conversion and RF-DAC with high power consumption are avoided; 2. modulation and amplification are realized through a first-stage circuit, so that the structure is greatly simplified, and bandwidth limitation caused by multi-stage amplification is avoided; 3. the local oscillation signal is a single-tone signal, and the design of the pre-stage buffer amplifier is relatively simple; 4. mixed signal spectral shaping enables the output spectrum of a digital transmitter to meet spectral mask specifications.
Fig. 8 is a flowchart of a modulation transmission method of a transmitter according to an embodiment of the present invention, as shown in fig. 8, the method may include:
s801: and generating local oscillation signals of N phases, wherein N is an integer greater than or equal to 2.
S802: driving an output unit by the local oscillation signal of each phase to complete amplitude modulation; each output unit comprises M subunits, wherein M is a positive integer; driving an output unit by a local oscillator signal of each phase to perform amplitude modulation, comprising: and controlling the opening number K of the subunits in the corresponding output unit of each phase based on the original code stream so as to control the weight of the output signal of each phase to complete amplitude modulation.
And the opening quantity K is the number of constellation points of the original code stream corresponding to the QAM constellation diagram.
In this embodiment, the original code stream may be used to control the multi-phase local oscillator signal, and different constellation points are implemented by the weight of the output signal of each phase (I signal and Q signal). The weights of the phase legs are different for different constellation points. Different phase output signals have different weights by controlling the opening number of the subunits in the output unit, so that the original code stream is directly modulated, amplified and transmitted.
S803: and after carrying out logic operation on the output signals of the N output units, synthesizing the QAM modulation signals and transmitting the QAM modulation signals through an antenna.
The main implementation body of the modulation transmission method of the transmitter provided by the embodiment of the present invention is the transmitter shown in any of the above embodiments, and the implementation principle and the implementation effect are similar, and are not described herein again.
In an exemplary embodiment of the present invention, N is 4, and the local oscillator signal with N phases may include: an in-phase I signal, a quadrature Q signal, an inverted I signal, and an inverted Q signal.
In an exemplary embodiment of the present invention, after the synthesizing of the modulation signal of the quadrature amplitude modulation QAM, before the transmitting through the antenna, the method may further include:
and transmitting the modulated signal through an antenna after power amplification.
In an exemplary embodiment of the present invention, before driving one output unit by the local oscillation signal of each phase, the method may further include:
and performing up-sampling interpolation processing on the local oscillation signal of each phase.
In an exemplary embodiment of the present invention, after performing upsampling interpolation processing on the local oscillator signal of each phase, the method may further include:
and processing the local oscillation signal edge slew rate after the up-sampling interpolation processing.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
Claims (10)
1. A directly modulated digital transmitter, comprising: the device comprises an oscillation module and a modulation transmitting module;
the oscillation module is used for generating local oscillation signals with N phases, wherein N is an integer greater than or equal to 2;
the modulation transmitting module comprises: the modulation transmitting module is used for driving one output unit through the local oscillation signal of each phase to complete amplitude modulation; each output unit comprises M subunits, wherein M is a positive integer;
the modulation transmitting module drives an output unit through the local oscillation signal of each phase to complete amplitude modulation, and the modulation transmitting module comprises: controlling the opening number K of the subunits in the corresponding output unit of each phase based on the original code stream so as to control the weight of the output signal of each phase to complete amplitude modulation; the opening quantity K is the number of constellation points of the original code stream corresponding to the quadrature amplitude modulation QAM constellation diagram;
and the modulation transmitting module is also used for synthesizing the modulation signals of the quadrature amplitude modulation QAM and transmitting the signals through an antenna after carrying out logic operation on the output signals of the N output units.
2. The transmitter of claim 1, wherein the local oscillator signal with N-4, N phases comprises: an in-phase I signal, a quadrature Q signal, an inverted I signal, and an inverted Q signal.
3. The transmitter of claim 1, further comprising a power amplification module, wherein the modulation transmission module is integrated in the power amplification module, and the power amplification module is configured to perform power amplification on the modulated signal and then transmit the amplified signal through an antenna.
4. The transmitter of claim 1, wherein the transmitter further comprises:
and the frequency spectrum shaping module is used for receiving the local oscillation signals of the N phases generated by the oscillation module, performing up-sampling interpolation processing on the local oscillation signals of each phase, and sending the local oscillation signals subjected to the up-sampling interpolation processing to the modulation transmitting module.
5. The transmitter according to claim 4, wherein the spectrum shaping module is further configured to process an edge slew rate of the local oscillator signal after the upsampling and interpolation processing, and send the local oscillator signal after the edge slew rate processing to the modulation transmitting module.
6. A modulation transmission method of a transmitter, comprising:
generating local oscillation signals of N phases, wherein N is an integer greater than or equal to 2;
driving an output unit by the local oscillation signal of each phase to complete amplitude modulation; each output unit comprises M subunits, wherein M is a positive integer;
driving an output unit by a local oscillator signal of each phase to perform amplitude modulation, comprising: controlling the opening number K of the subunits in the corresponding output unit of each phase based on the original code stream so as to control the weight of the output signal of each phase to complete amplitude modulation; the opening quantity K is the number of constellation points of the original code stream corresponding to the quadrature amplitude modulation QAM constellation diagram;
after performing logical operation on the output signals of the N output units, the output signals are synthesized into a modulation signal of quadrature amplitude modulation QAM and transmitted through an antenna.
7. The method of claim 6, wherein the local oscillator signal with N-4 and N-phase comprises: an in-phase I signal, a quadrature Q signal, an inverted I signal, and an inverted Q signal.
8. The method of claim 6, wherein after synthesizing the modulated signals of the quadrature amplitude modulation QAM and before transmitting via an antenna, the method further comprises:
and transmitting the modulated signal through an antenna after power amplification.
9. The method of claim 6, wherein before driving an output unit with a local oscillator signal for each phase, the method further comprises:
and performing up-sampling interpolation processing on the local oscillation signal of each phase.
10. The method of claim 9, wherein after performing upsampling interpolation processing on the local oscillator signal of each phase, the method further comprises:
and processing the local oscillation signal edge slew rate after the up-sampling interpolation processing.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115733502A (en) * | 2022-11-08 | 2023-03-03 | 华南理工大学 | Reconfigurable communication transmitter and method |
| CN115913852A (en) * | 2022-10-26 | 2023-04-04 | 西安空间无线电技术研究所 | Novel high carrier suppression four-phase balanced modulator |
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| US20090323859A1 (en) * | 2008-06-26 | 2009-12-31 | Bishop James W | Flexible, Reconfigurable, Power Efficient Transmitter and Method |
| CN103490776A (en) * | 2013-09-03 | 2014-01-01 | 中国电子科技集团公司第四十一研究所 | Ultra wide band hopping frequency synthesizer based on digital up-conversion |
| CN107346978A (en) * | 2016-05-05 | 2017-11-14 | 北京化工大学 | A kind of two-layer configuration transmitter system based on digital if technology |
| CN109565290A (en) * | 2016-09-23 | 2019-04-02 | 华为技术有限公司 | Digital front-end for Direct Digital radio-frequency modulator |
| CN111431554A (en) * | 2020-03-27 | 2020-07-17 | 深圳清华大学研究院 | Transmitter and wireless transceiver having the same |
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| EP0139033A1 (en) * | 1983-10-21 | 1985-05-02 | ANT Nachrichtentechnik GmbH | Digital direct RF-modulation method and circuit arrangement for carrying out said method |
| US20090323859A1 (en) * | 2008-06-26 | 2009-12-31 | Bishop James W | Flexible, Reconfigurable, Power Efficient Transmitter and Method |
| CN103490776A (en) * | 2013-09-03 | 2014-01-01 | 中国电子科技集团公司第四十一研究所 | Ultra wide band hopping frequency synthesizer based on digital up-conversion |
| CN107346978A (en) * | 2016-05-05 | 2017-11-14 | 北京化工大学 | A kind of two-layer configuration transmitter system based on digital if technology |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115913852A (en) * | 2022-10-26 | 2023-04-04 | 西安空间无线电技术研究所 | Novel high carrier suppression four-phase balanced modulator |
| CN115913852B (en) * | 2022-10-26 | 2024-05-31 | 西安空间无线电技术研究所 | Novel high carrier rejection four-phase balanced modulator |
| CN115733502A (en) * | 2022-11-08 | 2023-03-03 | 华南理工大学 | Reconfigurable communication transmitter and method |
| CN115733502B (en) * | 2022-11-08 | 2023-06-20 | 华南理工大学 | Reconfigurable communication transmitter and method |
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| CN112953879B (en) | 2022-08-30 |
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