CN110943700A - Signal generation system and terminal device - Google Patents
Signal generation system and terminal device Download PDFInfo
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- CN110943700A CN110943700A CN201911302932.0A CN201911302932A CN110943700A CN 110943700 A CN110943700 A CN 110943700A CN 201911302932 A CN201911302932 A CN 201911302932A CN 110943700 A CN110943700 A CN 110943700A
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- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
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Abstract
The application provides a signal generation system and terminal equipment, this system includes: the device comprises a power determining unit, a mode switching unit, a coefficient determining unit and a signal generating unit, wherein the power determining unit is respectively connected with the coefficient determining unit, the signal generating unit and the mode switching unit; the signal generating unit is respectively connected with the mode switching unit and the coefficient determining unit. The method is used for reducing the power consumption of the signal generation system and improving the efficiency of the signal generation system and the endurance time of a battery in the terminal equipment.
Description
Technical Field
The embodiment of the invention relates to the field of communication systems, in particular to a signal generation system and terminal equipment.
Background
Communication devices (e.g., mobile phones, tablet computers, etc.) are typically provided with signal generation systems. The signal generation system comprises a power amplifier, and the power amplifier is used for transmitting a radio-frequency signal generated in the signal generation system to an empty port of the communication equipment after performing power amplification on the radio-frequency signal according to a control voltage generated in the signal generation system.
Currently, methods for generating a control voltage include an Envelope Tracking (ET) method and an Average Power Tracking (APT) method, where signal generation systems corresponding to different control voltage generation methods are different. In practical applications, a signal generation system provided in the communication device can only generate a control voltage by using an APT method in the above-mentioned methods, which results in a large power consumption of the signal generation system and a reduction in a battery life of the communication device.
Disclosure of Invention
The embodiment of the invention provides a signal generation system and terminal equipment, which are used for reducing the power consumption of the signal generation system and improving the efficiency of the signal generation system and the endurance time of a battery in the terminal equipment.
In a first aspect, an embodiment of the present invention provides a signal generating system, applied to a terminal device, including: a power determining unit, a mode switching unit, a coefficient determining unit, and a signal generating unit, wherein,
the power determining unit is respectively connected with the coefficient determining unit, the signal generating unit and the mode switching unit; the signal generating unit is respectively connected with the mode switching unit and the coefficient determining unit;
the power determining unit is used for sending the transmitting power of the terminal equipment in the first time period to the coefficient determining unit, the signal generating unit and the mode switching unit;
the coefficient determining unit is used for determining a target predistortion coefficient combination in at least one pre-stored predistortion coefficient combination according to the transmitting power;
the mode switching unit is used for determining a target working mode according to the transmitting power and outputting a target control voltage according to the target working mode, wherein the target working mode is an envelope tracking ET mode or an average power tracking APT mode;
and the signal generating unit is used for generating a signal to be transmitted according to the transmitting power, the target predistortion coefficient combination and the target control voltage.
In one possible design, the mode switching unit includes: an envelope determination module, a first delay processing module, a variable voltage determination module, a first digital-to-analog converter, and a mode determination module, wherein,
the envelope determining module, the first time delay processing module, the variable voltage determining module, the first digital-to-analog converter and the mode determining module are sequentially connected;
the envelope determining module is also connected with the signal generating unit;
the mode determining module is also connected with the signal generating unit and the power determining unit respectively.
In one possible design, the first latency processing module includes: a first delay sub-block and a second delay sub-block, wherein,
the first time delay submodule is respectively connected with the envelope determining module and the second time delay submodule;
the second delay submodule is also connected to the variable voltage determination module.
In one possible design, the mode determination module includes: an envelope tracking modulator and an operating mode control sub-module, wherein,
the envelope tracking modulator is respectively connected with the first digital-to-analog converter, the signal generating unit and the working mode control submodule;
the working mode control submodule is also connected with the power determination unit.
In one possible design, the coefficient determination unit includes: a coefficient determining module and a coefficient output module, wherein,
the coefficient determining module is respectively connected with the power determining unit and the coefficient storage module;
the coefficient output module is also connected with the signal generating unit.
In one possible design, the signal generating unit includes: an up-sampling processing module, a signal processing module and a power processing module, wherein,
the upper sampling processing module, the signal processing module and the power processing module are sequentially connected;
the signal processing module is also respectively connected with the mode switching unit and the coefficient determining unit.
In one possible design, the upsampling processing module includes: a baseband signal generation sub-module and an up-sampling filter, wherein,
the baseband signal generation submodule is connected with the up-sampling filter;
the up-sampling filter is also connected with the signal processing module.
In one possible design, the signal processing module includes: a clipping processing sub-module, a digital predistorter, a third time delay sub-module, a second digital-to-analog converter, a carrier wave generator and an up-conversion sub-module, wherein,
the clipping processing submodule, the digital predistorter, the third time delay submodule, the second digital-to-analog converter and the up-conversion submodule are connected in sequence;
the digital predistorter is also connected with the coefficient determination unit;
the up-conversion sub-module is also respectively connected with the carrier generator and the power processing module.
In one possible design, the power processing module includes: a variable gain amplifier, a power amplifier, and a power control sub-module, wherein,
the variable gain amplifier is respectively connected with the up-conversion submodule, the power amplifier and the power control submodule;
the power control sub-module is also connected with the power determining unit;
the power amplifier is also connected to the mode switching unit.
In one possible design, the system further includes: a coefficient training unit, wherein,
the coefficient training unit is respectively connected with the signal generating unit and the coefficient determining unit;
the coefficient training unit is used for determining at least one predistortion coefficient combination according to a signal to be transmitted.
In one possible design, the coefficient training unit includes: a training control module, a timer, a data acquisition module, an analog-to-digital converter, a down-conversion module, a coupling switch and a coefficient calculation module, wherein,
the training control module is respectively connected with the data acquisition module, the timer and the power determination unit;
the data acquisition module is also respectively connected with the analog-to-digital converter, the coefficient calculation module and the signal generation unit;
the down-conversion module is also respectively connected with the coupling switch and the signal generating unit.
In a second aspect, an embodiment of the present invention provides a terminal device, where the terminal device includes the signal generation system in any one of the first aspects.
In the signal system, a mode switching unit determines a target working mode according to transmitting power and outputs a target control voltage according to the target working mode, and the target working mode is an envelope tracking ET mode or an average power tracking APT mode, so that the signal generation system can generate the target control voltage by adopting two modes (the envelope tracking ET mode and the average power tracking APT mode), the power consumption of the signal generation system is reduced, and the efficiency of the signal generation system and the endurance time of a battery in the terminal equipment are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a first schematic structural diagram of a signal generation system provided in the present application;
fig. 2 is a schematic structural diagram of a signal generation system provided in the present application;
fig. 3 is a schematic structural diagram of a signal generation system provided in the present application;
fig. 4 is a schematic structural diagram of a signal generation system provided in the present application;
FIG. 5 is a schematic diagram of a table of predistortion coefficients provided herein;
fig. 6 is a schematic diagram illustrating the relationship between the efficiency and the operating mode of the signal generation system under different transmission power conditions provided in the present application;
fig. 7 is an operation model of the digital predistorter provided by the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1 is a schematic structural diagram of a signal generation system provided in the present application. As shown in fig. 1, the signal generating system includes: a power determining unit 11, a mode switching unit 21, a coefficient determining unit 31, and a signal generating unit 41, wherein,
the power determination unit 11 is connected to the coefficient determination unit 31, the signal generation unit 41, and the mode switching unit 21, respectively; the signal generating unit 41 is connected to the mode switching unit 21 and the coefficient determining unit 31, respectively;
the power determining unit 11 is configured to send the transmission power of the terminal device in the first period to the coefficient determining unit 31, the signal generating unit 41 and the mode switching unit 21;
the coefficient determining unit 31 is configured to determine a target predistortion coefficient combination among at least one predistortion coefficient combination stored in advance according to the transmission power;
the mode switching unit 21 is configured to determine a target working mode according to the transmission power, and output a target control voltage according to the target working mode, where the target working mode is an envelope tracking ET mode or an average power tracking APT mode;
the signal generating unit 41 is configured to generate a signal to be transmitted according to the transmission power, the target predistortion coefficient combination and the target control voltage.
Alternatively, the terminal device may be a computer device, a tablet computer, a mobile phone (or referred to as "cellular" phone), and the like, and the terminal device may also be a portable, pocket, hand-held, computer-embedded mobile device or apparatus, which is not limited herein.
Specifically, the transmission power of the terminal device in the first time period is determined by the terminal device according to the power scheduled by the base station in the second time period and the path loss. Wherein the first period is subsequent to the second period.
In the present application, the at least one predistortion coefficient combination may be a predistortion coefficient combination calculated experimentally and stored in advance in the coefficient determination unit 31.
Optionally, the mode switching unit 21 is configured to determine the target operating mode according to a preset power threshold and the transmission power.
For example, when the preset power threshold is greater than or equal to the transmission power, the average power tracking APT mode is determined as the target operation mode.
For example, when the preset power threshold is smaller than the transmission power, the envelope tracking ET mode is determined as the target operation mode.
In the present application, the envelope tracking ET mode and the average power tracking APT mode occur in a time-sharing manner (i.e. the signal generating system only operates in one mode in the same time period), wherein a boundary point occurring in the time-sharing manner between the envelope tracking ET mode and the average power tracking APT mode is a preset power threshold.
Alternatively, the preset power threshold may be 20 decibel-milliwatts (dBm), 30dBm, etc.
Further, when the target operating mode is the envelope tracking ET mode, the target control voltage is a control voltage whose voltage value can be changed in the first period, and when the target operating mode is the average power tracking APT mode, the target control voltage is a control voltage whose voltage value is fixed in the first period.
In the signal generation system provided by the application, the mode switching unit 21 determines a target working mode according to the transmission power, and outputs a target control voltage according to the target working mode, wherein the target working mode is an envelope tracking ET mode or an average power tracking APT mode, so that the signal generation system can switch between the two modes to generate the target control voltage in different time periods, the power consumption of the signal generation system is reduced, and the efficiency of the signal generation system and the endurance time of a battery in a terminal device are improved.
On the basis of the above implementation, the signal generation system provided by the present application is further described below with reference to fig. 2, specifically, please refer to fig. 2.
Fig. 2 is a schematic structural diagram of a signal generation system provided in the present application. On the basis of fig. 1, as shown in fig. 2, the mode switching unit 21 includes: an envelope determination module 210, a first delay processing module 220, a variable voltage determination module 230, a first Digital-to-Analog Converter (DAC) 240, and a mode determination module 250, wherein,
the envelope determining module 210, the first delay processing module 220, the variable voltage determining module 230, the first digital-to-analog converter 240 and the mode determining module 250 are connected in sequence;
the envelope determination module 210 is further connected to the signal generation unit 41;
the mode determination module 250 is also connected to the signal generation unit 41 and the power determination unit 11, respectively.
Wherein, the envelope determining module 210 is further connected to the signal processing module 420 in the signal generating unit 41, and the mode determining module 250 is further connected to the power processing module 430 and the power determining unit 11 in the signal generating unit 41, respectively.
Specifically, the envelope determination module 210 is configured to determine an envelope waveform of the clipping signal output by the clipping processing sub-module 421 in the signal processing module 420, or determine an envelope waveform of the predistortion processing signal output by the digital predistorter 422 in the signal processing module 420, and provide the envelope waveform to the first delay processing module 220. The connection relationship between the envelope determining module 210 and the signal processing module 420 is shown in the embodiment of fig. 3. Here, the description is omitted.
Specifically, the first delay processing module 220 is configured to obtain an envelope waveform to be transmitted according to the envelope waveform, and provide the envelope waveform to be transmitted to the variable voltage determining module 230.
It should be noted that, the first delay processing module 220 cooperates with the third delay submodule 423 in the signal generating unit 41 to make the time when the target control voltage reaches the power amplifier 432 match with the time when the power amplifier 432 in the signal generating unit 41 receives the target pre-generated signal.
Specifically, the variable voltage determining module 230 is configured to obtain a digital control voltage according to the envelope waveform to be transmitted, and provide the digital control voltage to the first digital-to-analog converter 240.
Specifically, the first digital-to-analog converter 240 is configured to perform digital-to-analog conversion processing on the digital control voltage to obtain an analog control voltage, and provide the analog control voltage to the mode determining module 250.
Specifically, the mode determining module 250 is configured to determine a target operating mode according to the transmission power sent by the power determining unit 11, and process the analog control voltage provided by the power processing module 430 according to the target operating mode to obtain a target control voltage.
In one possible design, the coefficient determination unit 31 includes: a coefficient determination module 310 and a coefficient output module 320, wherein,
the coefficient determining module 310 is respectively connected with the power determining unit 11 and the coefficient output module 320;
the coefficient output module 320 is also connected to the signal generation unit 41.
The coefficient output module 320 is connected to the signal processing module 420 in the signal generating unit 41.
Specifically, the coefficient determining module 310 is configured to determine a combination identifier corresponding to the transmission power according to the transmission power provided by the power determining unit 11 and a preset corresponding relationship, and provide the combination identifier to the coefficient outputting module 320. The preset corresponding relation comprises at least one transmitting power and a combined identifier corresponding to each transmitting power, and each transmitting power is different.
Specifically, the coefficient output module 320 is configured to store a predistortion coefficient table, where the predistortion coefficient table includes at least one predistortion coefficient combination and a combination identifier of each predistortion coefficient combination. Alternatively, the number of the predistortion coefficient tables may be plural. Optionally, the combined identifier may be an index number, and may also be another index number, where the index number corresponds to the transmission power one to one, and for example, the index number may be 0, 1, 2, and so on. In practical applications, a predistortion coefficient combination may be uniquely determined by a combination identification among at least one predistortion coefficient combination included in the predistortion coefficient table.
It should be noted that the structure of the predistortion coefficient table may refer to the embodiment in fig. 5, and will not be described in detail here.
Specifically, the coefficient output module 320 is configured to determine a target predistortion coefficient combination from at least one preset and pre-stored predistortion coefficient combination according to a combination identifier, where the identifier of the target predistortion coefficient combination is one-to-one corresponding to or the same as the combination identifier.
In one possible design, the signal generating unit 41 includes: an upsampling processing module 410, a signal processing module 420, and a power processing module 430, wherein,
the up-sampling processing module 410, the signal processing module 420 and the power processing module 430 are connected in sequence;
the signal processing module 420 is also connected to the mode switching unit 21 and the coefficient determination unit 31, respectively.
The signal processing module 420 is connected to the envelope determining module 210 in the mode switching unit 21 and the coefficient output module in the coefficient determining unit 31, respectively.
In particular, the upsampling processing module 410 is configured to provide the upsampled signal to the signal processing module 420.
Specifically, the signal processing module 420 is configured to perform clipping processing, pre-distortion processing, delay matching processing, digital-to-analog conversion processing, and up-conversion processing on the up-sampled signal in sequence to obtain a pre-generated signal, and provide the pre-generated signal to the power processing module 430.
Specifically, the power processing module 430 is configured to process the pre-generated signal according to the transmission power, the target predistortion coefficient combination and the target control voltage, so as to generate a signal to be transmitted. Wherein, the power of the signal to be transmitted is the same as the transmitting power.
In the signal generating system provided by the present application, the envelope determining module 210, the first delay processing module 220, the variable voltage determining module 230, the first digital-to-analog converter 240, and the mode determining module 250 are connected in sequence; the envelope determination module 210 is further connected to the signal generation unit 41; the mode determination module 250 is further connected to the signal generation unit 41 and the power determination unit 11, respectively, so that the signal generation system can determine the target operation mode according to the transmission power. Further, the coefficient determination module 310 is connected to the power determination unit 11 and the coefficient output module 320, respectively; the coefficient output module 320 is also connected to the signal generation unit 41, so that the signal generation system can determine the target predistortion coefficient combination according to the transmission power. In the process, the target working mode corresponds to the target predistortion coefficient combination, so that the normal operation of the signal generation system is guaranteed.
Furthermore, the signal generation system can be flexibly switched between an ET mode and an APT mode according to the transmitting power, so that the signal generation system can work in different working modes, and the application scene of the signal generation system is expanded.
On the basis of the above embodiments, the signal generating system provided by the present application is further described in detail below with reference to fig. 3, specifically, please refer to fig. 3.
Fig. 3 is a schematic structural diagram of a signal generation system provided in the present application. On the basis of fig. 2, as shown in fig. 3, the first delay processing module 220 includes: a first delay sub-block 221 and a second delay sub-block 222, wherein,
the first delay submodule 221 is connected to the envelope determining module 210 and the second delay submodule 222, respectively;
the second delay sub-module 222 is also coupled to the variable voltage determination module 230. The variable Voltage determination module is a Power Voltage Table (PVT) module.
Specifically, the first delay submodule 221 is configured to perform coarse delay matching adjustment processing on the envelope waveform to obtain a coarse adjustment envelope waveform, and provide the coarse adjustment envelope waveform to the second delay submodule 222.
It should be noted that the second delay submodule 222 is a fine delay adjustment module, and the second delay submodule 222 is configured to perform fine delay adjustment processing on the coarsely adjusted envelope waveform to obtain an envelope waveform to be transmitted.
In one possible design, mode determination module 250 includes: an Envelope Tracking Modulator (ETM) 251 and an operating mode control sub-module 252, wherein,
the envelope tracking modulator 251 is respectively connected with the first digital-to-analog converter 240, the signal generating unit 41 and the working mode control submodule 252;
the operating mode control submodule 252 is also connected to the power determination unit 11.
Wherein the envelope tracking modulator 251 is connected to a power amplifier 432 in the signal generating unit 41.
Specifically, the operation mode control sub-module 252 is configured to determine a target operation mode according to the transmission power provided by the power determining unit 11, and provide the target operation mode to the envelope tracking modulator 251.
Specifically, the envelope tracking modulator 251 obtains a target control voltage according to the target operating mode and the analog control voltage provided by the first dac 240, and provides the target control voltage to the power amplifier 432.
In one possible design, the upsampling processing module 410 includes: a baseband signal generating sub-module 411 and an up-sampling filter 412, wherein,
the baseband signal generation sub-module 411 is connected to the up-sampling filter 412;
the upsampling filter 412 is also coupled to a signal processing module 420.
Wherein the upsampling filter 412 is connected to a clipping processing sub-module 421 in the signal processing module 420.
Specifically, the baseband signal generation sub-module 411 is used to produce a baseband signal and provide the baseband signal to the up-sampling filter 412. Alternatively, the baseband signal is an information sequence consisting of 0 and 1, for example, the information sequence is "110100".
Specifically, the upsampling filter 412 is configured to perform upsampling on the baseband signal to obtain an upsampled signal, and provide the upsampled signal to the clipping processing sub-module 421.
In one possible design, the signal processing module 420 includes: a clipping processing sub-module 421, a digital predistorter 422, a third time delay sub-module 423, a second digital-to-analog converter 424, a carrier generator 425, and an up-conversion sub-module 426, wherein,
the clipping processing submodule 421, the digital predistorter 422, the third time delay submodule 423, the second digital-to-analog converter 424 and the up-conversion submodule 426 are connected in sequence;
the digital predistorter 422 is also connected to the coefficient determination unit 31;
the up-conversion sub-module 426 is connected to the carrier generator 425 and the power processing module 430, respectively.
Wherein the signal processing module 420 is connected to the envelope determination module 210.
In particular, the envelope determination module 210 may be connected to an output of the clipping processing sub-module 421, or to an output of the digital predistorter 422 (e.g., connected by a dashed line in fig. 3).
Specifically, the clipping processing sub-module 421 is configured to perform clipping processing on the upsampled signal provided by the upsampling filter 412 to obtain a clipped signal, and provide the clipped signal to the digital predistorter 422.
Specifically, the digital predistorter 422 is configured to perform predistortion processing on the clipped signal to obtain a predistortion processing signal, and provide the predistortion processing signal to the third delay sub-module 423.
Specifically, the third delay submodule 423 is configured to perform delay matching processing on the pre-distortion processed signal to obtain a delay matched signal, and provide the delay matched signal to the second digital-to-analog converter 424. Specifically, the third delay sub-module 423 cooperates with the first delay processing module 220 to make the time when the target control voltage reaches the power amplifier 432 match the time when the target pre-generated signal is received by the power amplifier 432 in the signal generating unit 41.
Specifically, the second digital-to-analog converter 424 is configured to perform digital-to-analog conversion on the delay-matched signal to obtain an analog signal, and provide the analog signal to the up-conversion sub-module 426.
Specifically, the up-conversion sub-module 426 is configured to perform up-conversion on the analog signal and the carrier signal provided by the carrier generator 425 to obtain a pre-generated signal, and provide the pre-generated signal to the variable gain amplifier 431. Carrier generator 425 is used, among other things, to generate a carrier signal.
Further, the up-conversion sub-module 426 includes a multiplier and a filter, wherein the multiplier is configured to perform frequency mixing processing on the analog signal and the carrier signal to obtain a mixed signal and provide the mixed signal to the filter, and the filter is configured to perform filtering processing on the mixed signal to obtain a high-frequency signal (i.e., a pre-generated signal) and provide the pre-generated signal to the power processing module 430.
In one possible design, power processing module 430 includes: a variable gain amplifier 431, a power amplifier 432, and a power control sub-module 433, wherein,
the variable gain amplifier 431 is respectively connected with the up-conversion submodule 426, the power amplifier 432 and the power control submodule 433;
the power control submodule 433 is also connected to the power determining unit 11;
the power amplifier 432 is also connected to the mode switching unit 21.
Wherein the power amplifier 432 is connected to the envelope tracking demodulator 251 in the mode switching unit 21.
Specifically, the power control sub-module 433 is configured to adjust the gain value of the variable gain amplifier 431 according to the transmission power provided by the power determination unit 11, so that the variable gain amplifier 431 has a target gain value.
Specifically, the variable gain amplifier 431 is configured to process the target gain value and the pre-generated signal provided by the up-conversion sub-module 426 to obtain a target pre-generated signal, and provide the target pre-generated signal to the power amplifier 432.
Specifically, the power amplifier 432 is configured to amplify the target pre-generated signal according to the target control voltage provided by the envelope tracking modulator 251 to obtain a signal to be transmitted.
In the embodiment of fig. 3, the power determining unit 311, the coefficient determining module 310, the coefficient output module 320, and the digital predistorter 422 are sequentially connected, so that the coefficient output module 320 can provide a target predistortion coefficient combination corresponding to the transmission power to the digital predistorter 422, thereby improving the flexibility of controlling the target predistortion coefficient combination of the digital predistorter 422.
Further, in the process of dynamically switching the signal generation system between the ET mode and the APT mode, the dynamic change of the structure of the digital predistorter 422 may be implemented by adjusting the target predistortion coefficient combination in the ET mode and the target predistortion coefficient combination in the APT mode.
On the basis of the foregoing embodiment, the signal generation system provided by the present application may further include: a coefficient training unit, wherein,
the coefficient training unit is connected with the signal generation unit 41 and the coefficient determination unit 31 respectively;
the coefficient training unit is used for determining at least one predistortion coefficient combination according to a signal to be transmitted.
The following describes the coefficient training unit provided in the present application in detail with reference to the embodiment of fig. 4, specifically, please refer to fig. 4.
Fig. 4 is a schematic structural diagram of a signal generation system provided in the present application. On the basis of fig. 3, as shown in fig. 4, the coefficient training unit includes: a training control module 510, a timer 520, a data acquisition module 530, an Analog-to-Digital Converter (ADC) 540, a down-conversion module 550, a coupling switch 560, and a coefficient calculation module 570, wherein,
the training control module 510 is respectively connected with the data acquisition module 530, the timer 520 and the power determination unit 11;
the data acquisition module 530 is further connected to the analog-to-digital converter 540, the coefficient calculation module 570 and the signal generation unit 41 respectively;
the down-conversion module 550 is also connected to the coupling switch 560 and the signal generation unit 41, respectively.
The data acquisition module 530 is connected to the output end of the up-sampling filter 412 in the signal generation unit 41, and the down-conversion module 550 is connected to the carrier generator 425 in the signal generation unit 41.
Specifically, the training control module 510 is configured to detect the transmission power provided by the power determining unit 11 according to a timing interval of the timer 520, and when it is determined that the transmission power is greater than or equal to a preset power threshold, the training control module 510 provides a trigger signal to the data acquisition module 530. Alternatively, the timing interval may be 10 milliseconds (ms), 20ms, etc. Optionally, the preset power threshold is 20dBm, 30dBm, etc.
For example, the preset power threshold is 20dBm, the timing interval is 10ms, the training control module 510 detects the transmission power every 10ms, and if the transmission power is 22dBm, the training control module 510 provides a trigger signal to the data acquisition module 530.
Specifically, the coupling switch 560 is configured to couple a signal to be transmitted to the down-conversion module 550.
Specifically, the down-conversion module 550 is configured to perform down-conversion processing on a signal to be transmitted and a carrier signal provided by the carrier generator 425 to obtain a baseband sampling signal, and transmit the baseband sampling signal to the data acquisition module 530.
Specifically, the data acquisition module 530 is configured to perform information acquisition on a baseband sampling signal according to a trigger signal provided by the training control module 510 to obtain baseband signal data information, perform information acquisition on an upsampling signal provided by the upsampling filter 412 to obtain sampling data information, and provide the baseband signal data information and the sampling data information to the coefficient calculation module 570.
Specifically, the coefficient calculation module 570 is configured to calculate a predistortion coefficient combination according to the baseband signal data information and the sampling data information, and further determine whether a predistortion coefficient included in the predistortion coefficient combination meets a requirement according to a preset coefficient range. If each predistortion coefficient is within the preset coefficient range, it is determined that the predistortion coefficient combination meets the requirement, and the predistortion coefficient combination is provided to the coefficient output module 320. So that the coefficient output module 320 stores the predistortion coefficient combination into the predistortion coefficient table, wherein the combination identification corresponds to the transmission power provided by the power determination unit 11.
It should be noted that, the power determining unit 11 may provide the transmission power to the coefficient output module 320 through the training control module 510 and the data acquisition module 530, so that the coefficient output module 320 configures a combined identifier for the predistortion coefficient combination according to the transmission power; or the power determining unit 11 may provide the transmission power to the data collecting module 530 through the training control module 510, and the data collecting module 530 configures the combined identifier for the transmission power and provides the combined identifier to the coefficient output module 320, so that the coefficient output module 320 stores the combined identifier.
Fig. 5 is a schematic diagram of a predistortion coefficient table provided in the present application. As shown in fig. 5, the predistortion coefficient table includes: the predistortion coefficient combination of the first group, the combination mark 0 corresponding to the predistortion coefficient combination of the first group, the predistortion coefficient combination of the second group, the combination mark 1 corresponding to the predistortion coefficient combination of the second group, the predistortion coefficient combination of the third group, the combination mark 2 corresponding to the predistortion coefficient combination of the third group, the predistortion coefficient combination of the fourth group, the combination mark 3 corresponding to the predistortion coefficient combination of the fourth group, the predistortion coefficient combination of the fifth group, and the combination mark 4 corresponding to the predistortion coefficient combination of the fifth group.
Optionally, the predistortion coefficient combination may further include a transmission power and a target operation module (an ET mode or an APT mode). For example, the first set of predistortion coefficient combinations includes a first transmit power and an ET pattern.
It should be noted that the number of predistortion coefficients in the predistortion coefficient combinations in the ET mode and the APT mode is the same, and the format of each predistortion coefficient in the predistortion coefficient combinations in the ET mode and the APT mode is uniform, for example, the format may be a floating point type, and two digits after a decimal point are taken. Fig. 5 exemplarily shows 5 predistortion coefficient combinations, and the application does not specifically limit the specific number of predistortion coefficient combinations.
In the application, the coverage of the transmission power corresponding to the ET mode and the APT mode may be planned according to the efficiency of the power amplifier model.
It should be noted that, when the predistortion coefficient table includes the target operating module and the transmission power, when the transmission power is less than or equal to the preset power threshold, the target operating module is in the APT mode, and when the transmission power is greater than the preset power threshold, the target operating module is in the ET mode.
In the present application, in the predistortion coefficient table shown in fig. 5, the preset power threshold is the fourth transmission power.
On the basis of the above embodiments, the present application further provides a relationship between the efficiency and the operating mode of the signal generation system under different transmission power conditions. As shown in detail in fig. 6.
Fig. 6 is a schematic diagram illustrating a relationship between the efficiency and the operation mode of the signal generation system under different transmission power conditions. As shown in fig. 6, when the transmission power is less than or equal to the preset power threshold, the efficiency of the signal generation system in the ET mode is less than or equal to the efficiency of the signal generation system in the APT mode. When the transmitting power is larger than or equal to the preset power threshold, the efficiency of the signal generating system in the ET mode is larger than that in the APT mode.
In this application, a signal to be transmitted is a traffic signal, and when bandwidths of the traffic signal are different, the preset power thresholds are usually different under the same transmission power condition.
For example, when the same transmission power is 23dBm, if the bandwidth of the traffic signal is 20 megahertz (MHz), the preset power threshold is 19dBm, and if the bandwidth of the traffic signal is 40MHz, the preset power threshold is 20 dBm.
Further, if the bandwidth of the service signal is 20 megahertz (MHz) and the preset power threshold is 19dBm, when the transmission power is less than or equal to 19dBm, the efficiency of the signal generation system in the ET mode is less than or equal to the efficiency of the signal generation system in the APT mode, that is, the signal generation system is adopted in the APT mode, and when the transmission power is greater than or equal to 19dBm and less than or equal to 23dBm, the efficiency of the signal generation system in the ET mode is greater than the efficiency of the signal generation system in the APT mode, that is, the signal generation system is adopted in the ET mode.
In the present application, the tables of predistortion coefficients corresponding to bandwidths of different traffic signals are usually different under the same transmission power condition. It should be noted that, when the transmission power is not changed and the bandwidth of the service signal is changed, the signal generation system needs to reinitiate and obtain the predistortion coefficient table corresponding to the bandwidth of the changed service signal after initialization.
Based on the above embodiments, an operation model of the digital predistorter provided in the present application is described below with reference to fig. 7, specifically, refer to fig. 7.
Fig. 7 is an operation model of the digital predistorter provided by the present application. As shown In fig. 7, the clipping signal provided by the clipping processing sub-module 421 to the digital predistorter 422 includes an In-phase branch signal I and a quadrature branch signal Q, after the digital predistorter 422 receives the In-phase branch signal I and the quadrature branch signal Q, a preprocessing unit inside the digital predistorter 422 performs delay processing on the In-phase branch signal I and performs weighting adjustment processing on the amplitude of the In-phase branch signal I to obtain delayed In-phase branch signals I1, I2, … …, and In, performs delay processing on the quadrature branch signal Q, and performs weighting adjustment processing on the amplitude of the quadrature branch signal Q to obtain delayed quadrature branch signals Q1, Q2, and … … In.
Further, the target predistortion coefficient combination includes predistortion coefficients P _1_ I to P _ n _ I and predistortion coefficients P _1_ Q to P _ n _ Q, wherein the delayed In-phase branch signal I1 and the delayed quadrature branch signal Q1 are complex-multiplied with the predistortion coefficients P _1_ I and the predistortion coefficients P _1_ Q, i.e., (I1+ I x Q1) (P _1_ I + I P _1_ Q), the delayed In-phase branch signal I2 and the delayed quadrature branch signal Q2 are complex-multiplied with the predistortion coefficients P _2_ I and the predistortion coefficients P _2_ Q, i.e., (I2+ I x Q2) (P _2_ I + I P _2_ Q), the … … delayed In-phase branch signal In and the delayed quadrature branch signal Qn are complex-multiplied with the predistortion coefficients P _ n _ I and the predistortion coefficients P _ n _ I + Q, I + Q _ n (In + Q) complex-n (P _ I + n _ n + Q), and accumulating real parts of the n complex multiplication results to obtain an in-phase output signal P _ out _ I, and accumulating imaginary parts of the n complex multiplication results to obtain an orthogonal output signal P _ out _ Q, wherein the in-phase output signal P _ out _ I and the orthogonal output signal P _ out _ Q are contained in a pre-distortion processing signal, and the real part of the pre-distortion processing signal is the in-phase output signal P _ out _ I, and the imaginary part of the pre-distortion processing signal is the orthogonal output signal P _ out _ Q. Wherein i is an imaginary number.
In the present application, when the target operation mode of the signal generation system is different (ET mode or APT mode), and the nonlinear characteristic of the power amplifier is different, the structure of the digital predistorter 422 required is also different, so that the nonlinear characteristic of the power amplifier can be changed by adjusting the predistortion coefficients in the target predistortion coefficient combination, and further, the target operation mode of the signal generation system can be changed.
It should be noted that the digital predistorter 422 further includes a complex filter.
For example, the target operation mode is an APT mode operation, and if the complex filter in the digital predistorter 422 requires 3-order complex filtering to meet the performance requirement of the signal generating system, the target predistortion coefficient combination of the corresponding digital predistorter 422 includes 6 predistortion coefficients, i.e., P _1_ I, P _1_ Q, P _2_ I, P _2_ Q, P _3_ I, P _3_ Q.
For example, if the target operation mode is an ET mode operation, if the complex filter in the digital predistorter 422 requires 5-order complex filtering to meet the performance requirement of the signal generating system, the target predistortion coefficient combination of the corresponding digital predistorter 422 includes 10 predistortion coefficients, i.e., P _1_ I, P _1_ Q, P _2_ I, P _2_ Q, P _3_ I, P _3_ Q, P _4_ I, P _4_ Q, P _5_ I, P _5_ Q.
In the above example, in the ET mode, the target predistortion coefficient combination only includes 10 predistortion coefficients, i.e., P _1_ I, P _1_ Q, P _2_ I, P _2_ Q, P _3_ I, P _3_ Q, P _4_ I, P _4_ Q, P _5_ I, P _5_ Q. The target predistortion coefficient combination P _1_ I, P _1_ Q, P _2_ I, P _2_ Q, P _3_ I, P _3_ Q corresponding to the APT mode may be expanded to the target predistortion coefficient combination P _1_ I, P _1_ Q, P _2_ I, P _2_ Q, P _3_ I, P _3_ Q, 0 so that the number of predistortion coefficients included in the target predistortion coefficient combination in the APT mode and the ET mode is uniform.
Similarly, in the APT mode, if the target predistortion coefficient combination includes P _1_ I, P _1_ Q, P _2_ I, P _2_ Q, P _4_ I, P _4_ Q, the target predistortion coefficient combination P _1_ I, P _1_ Q, P _2_ I, P _2_ Q, P _4_ I, P _4_ Q may be expanded to the target predistortion coefficient combination P _1_ I, P _1_ Q, P _2_ I, P _2_ Q, 0, P _4_ I, P _4_ Q, 0, so that the number of predistortion coefficients included in the target predistortion coefficient combination in the APT and ET modes is consistent.
In the application, the number of predistortion coefficients included in the target predistortion coefficient combination in the two working modes is the same, and the structure of the digital predistorter 422 is the same, thereby ensuring that the signal generation system provided with the digital predistorter 422 can perform switching operation in the two working modes.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (12)
1. A signal generation system, applied to a terminal device, comprising: a power determining unit, a mode switching unit, a coefficient determining unit, and a signal generating unit, wherein,
the power determining unit is respectively connected with the coefficient determining unit, the signal generating unit and the mode switching unit; the signal generating unit is respectively connected with the mode switching unit and the coefficient determining unit;
the power determining unit is configured to send the transmission power of the terminal device in a first period to the coefficient determining unit, the signal generating unit and the mode switching unit;
the coefficient determining unit is used for determining a target predistortion coefficient combination in at least one pre-stored predistortion coefficient combination according to the transmitting power;
the mode switching unit is used for determining a target working mode according to the transmitting power and outputting a target control voltage according to the target working mode, wherein the target working mode is an Envelope Tracking (ET) mode or an Average Power Tracking (APT) mode;
and the signal generating unit is used for generating a signal to be transmitted according to the transmitting power, the target predistortion coefficient combination and the target control voltage.
2. The system of claim 1, wherein the mode switching unit comprises: an envelope determination module, a first delay processing module, a variable voltage determination module, a first digital-to-analog converter, and a mode determination module, wherein,
the envelope determining module, the first time delay processing module, the variable voltage determining module, the first digital-to-analog converter and the mode determining module are sequentially connected;
the envelope determination module is also connected with the signal generation unit;
the mode determining module is also connected with the signal generating unit and the power determining unit respectively.
3. The system of claim 2, wherein the first latency processing module comprises: a first delay sub-block and a second delay sub-block, wherein,
the first time delay sub-module is respectively connected with the envelope determining module and the second time delay sub-module;
the second delay submodule is also connected with the variable voltage determination module.
4. The system of claim 2, wherein the mode determination module comprises: an envelope tracking modulator and an operating mode control sub-module, wherein,
the envelope tracking modulator is respectively connected with the first digital-to-analog converter, the signal generating unit and the working mode control submodule;
the working mode control submodule is also connected with the power determination unit.
5. The system according to claim 1, wherein the coefficient determining unit comprises: a coefficient determining module and a coefficient output module, wherein,
the coefficient determining module is respectively connected with the power determining unit and the coefficient storing module;
the coefficient output module is also connected with the signal generation unit.
6. The system of claim 1, wherein the signal generation unit comprises: an up-sampling processing module, a signal processing module and a power processing module, wherein,
the up-sampling processing module, the signal processing module and the power processing module are connected in sequence;
the signal processing module is also respectively connected with the mode switching unit and the coefficient determining unit.
7. The system of claim 6, wherein the upsampling processing module comprises: a baseband signal generation sub-module and an up-sampling filter, wherein,
the baseband signal generation submodule is connected with the up-sampling filter;
the up-sampling filter is also connected with the signal processing module.
8. The system of claim 7, wherein the signal processing module comprises: a clipping processing sub-module, a digital predistorter, a third time delay sub-module, a second digital-to-analog converter, a carrier wave generator and an up-conversion sub-module, wherein,
the clipping processing submodule, the digital predistorter, the third time delay submodule, the second digital-to-analog converter and the up-conversion submodule are connected in sequence;
the digital predistorter is also connected with the coefficient determination unit;
the up-conversion sub-module is also respectively connected with the carrier generator and the power processing module.
9. The system of claim 8, wherein the power processing module comprises: a variable gain amplifier, a power amplifier, and a power control sub-module, wherein,
the variable gain amplifier is respectively connected with the up-conversion sub-module, the power amplifier and the power control sub-module;
the power control sub-module is also connected with the power determination unit;
the power amplifier is also connected with the mode switching unit.
10. The system of claim 1, further comprising: a coefficient training unit, wherein,
the coefficient training unit is respectively connected with the signal generating unit and the coefficient determining unit;
the coefficient training unit is configured to determine the at least one predistortion coefficient combination according to the signal to be transmitted.
11. The system of claim 10, wherein the coefficient training unit comprises: a training control module, a timer, a data acquisition module, an analog-to-digital converter, a down-conversion module, a coupling switch and a coefficient calculation module, wherein,
the training control module is respectively connected with the data acquisition module, the timer and the power determination unit;
the data acquisition module is also respectively connected with the analog-to-digital converter, the coefficient calculation module and the signal generation unit;
the down-conversion module is also respectively connected with the coupling switch and the signal generating unit.
12. A terminal device, characterized in that it comprises a signal generation system according to any one of the preceding claims 1 to 11.
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