WO2021121191A1

WO2021121191A1 - Signal generation system and terminal device

Info

Publication number: WO2021121191A1
Application number: PCT/CN2020/136197
Authority: WO
Inventors: 胡立娟; 林颢
Original assignee: 北京紫光展锐通信技术有限公司
Priority date: 2019-12-17
Filing date: 2020-12-14
Publication date: 2021-06-24
Also published as: CN110943700A; CN110943700B

Abstract

A signal generation system and a terminal device. The system comprises: a power determining unit, a mode switching unit, a coefficient determining unit, and a signal producing unit, wherein the power determining unit is separately connected to the coefficient determining unit, the signal producing unit, and the mode switching unit, and the signal producing unit is separately connected to the mode switching unit and the coefficient determining unit. By means of the system, the power consumption of the signal generation system is reduced, the efficiency of the signal generation system is improved, and the endurance time of a battery in the terminal device is prolonged.

Description

Signal generation system and terminal equipment

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office with the application number 2019113029320 and the application name "Signal Generation System and Terminal Equipment" on December 17, 2019, the entire content of which is incorporated into this application by reference.

Technical field

The embodiment of the present invention relates to the field of communication systems, in particular to a signal generation system and terminal equipment.

Background technique

Communication devices (for example, mobile phones, tablet computers, etc.) are usually provided with signal generation systems. The signal generation system includes a power amplifier, which is used to power amplify the radio frequency signal generated in the signal generation system according to the control voltage generated in the signal generation system, and then send it to the air interface of the communication device.

At present, methods for generating control voltages include an envelope tracking (ET) method and an average power tracking (Average Power Track, APT) method. Among them, different control voltage generation methods correspond to different signal generation systems. In practical applications, the signal generation system set in the communication device usually can only use the APT method in the above method to generate the control voltage, which causes the signal generation system to consume a lot of power and reduces the battery life of the communication device.

Summary of the invention

The embodiment of the present invention provides a signal generation system and terminal equipment, which are used to reduce the power consumption of the signal generation system, improve the efficiency of the signal generation system and the battery life time of the terminal equipment.

In the first aspect, an embodiment of the present invention provides a signal generation system, which is applied to a terminal device, and includes: a power determination unit, a mode switching unit, a coefficient determination unit, and a signal generation unit, wherein:

The power determining unit is respectively connected to the coefficient determining unit, the signal generating unit and the mode switching unit; the signal generating unit is respectively connected to the mode switching unit and the coefficient determining unit;

The power determining unit is configured to send the transmitting power of the terminal device in the first time period to the coefficient determining unit, the signal generating unit, and the mode switching unit;

The coefficient determining unit is configured to determine a target predistortion coefficient combination from at least one pre-stored predistortion coefficient combination according to the transmission power;

The mode switching unit is used to determine the target operating mode according to the transmission power, and output the target control voltage according to the target operating mode, the target operating mode is the envelope tracking ET mode or the average power tracking APT mode;

The signal generating unit is used to generate the signal to be sent according to the transmission power, the target predistortion coefficient combination and the target control voltage.

In a 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 determination module, the first delay processing module, the variable voltage determination module, the first digital-to-analog converter, and the mode determination module are connected in sequence;

The envelope determining module is also connected to the signal generating unit;

The mode determination module is also connected to the signal generation unit and the power determination unit respectively.

In a possible design, the first delay processing module includes: a first delay sub-module and a second delay sub-module, where:

The first delay sub-module is respectively connected to the envelope determination module and the second delay sub-module;

The second time delay sub-module is also connected to the variable voltage determination module.

In a possible design, the mode determination module includes: an envelope tracking modulator and a working mode control sub-module, where:

The envelope tracking modulator is respectively connected with the first digital-to-analog converter, the signal generating unit and the working mode control sub-module;

The working mode control sub-module is also connected to the power determination unit.

In a possible design, the coefficient determination unit includes: a coefficient determination module and a coefficient output module, where:

The coefficient determination module is respectively connected with the power determination unit and the coefficient storage module;

The coefficient output module is also connected to the signal generating unit.

In a possible design, the signal generation unit includes: an up-sampling processing module, a signal processing module, and a power processing module, where:

The up-sampling processing module, the signal processing module and the power processing module are connected in sequence;

The signal processing module is also connected to the mode switching unit and the coefficient determining unit respectively.

In a possible design, the up-sampling processing module includes: a baseband signal generation sub-module and an up-sampling filter, where:

The baseband signal generation sub-module is connected to the up-sampling filter;

The upsampling filter is also connected to the signal processing module.

In a possible design, the signal processing module includes: a clipping processing sub-module, a digital predistorter, a third delay sub-module, a second digital-to-analog converter, a carrier generator, and an up-conversion sub-module, among which,

The clipping processing sub-module, the digital predistorter, the third delay sub-module, the second digital-to-analog converter and the up-conversion sub-module are connected in sequence;

The digital predistorter is also connected to the coefficient determining unit;

The up-conversion sub-module is also connected to the carrier generator and the power processing module respectively.

In a possible design, the power processing module includes: a variable gain amplifier, a power amplifier, and a power control sub-module, where:

The variable gain amplifier is connected to the up-conversion sub-module, power amplifier and power control sub-module respectively;

The power control sub-module is also connected to the power determination unit;

The power amplifier is also connected to the mode switching unit.

In a possible design, the system further includes: a coefficient training unit, wherein,

The coefficient training unit is respectively connected with the signal generation unit and the coefficient determination unit;

The coefficient training unit is used to determine at least one combination of predistortion coefficients according to the signal to be sent.

In a 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, among which,

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 connected to the analog-to-digital converter, the coefficient calculation module and the signal generation unit respectively;

The down-conversion module is also connected to the coupling switch and the signal generating unit respectively.

In a second aspect, an embodiment of the present invention provides a terminal device, and the terminal device includes the signal generation system in any one of the first aspect.

This application provides a signal generation system and intermediate terminal equipment. In the signal system, the mode switching unit determines the target operating mode according to the transmission power, and outputs the target control voltage according to the target operating mode. The target operating mode is the envelope tracking ET mode , Or average power tracking APT mode, so that the signal generation system in this application can use two modes (envelope tracking ET mode and average power tracking APT mode) to generate the target control voltage, which reduces the power consumption of the signal generation system and improves the signal Generate the efficiency of the system and the battery life of the terminal device.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor.

Fig. 1 is a first structural diagram of the signal generation system provided by this application;

Figure 2 is a second structural diagram of the signal generation system provided by this application;

FIG. 3 is a schematic diagram three of the structure of the signal generation system provided by this application;

Figure 4 is a fourth structural diagram of the signal generation system provided by this application;

FIG. 5 is a schematic diagram of the predistortion coefficient table provided by this application;

FIG. 6 is a schematic diagram of the relationship between the efficiency of the signal generation system and the working mode under different transmission power conditions provided by this application;

Fig. 7 is a working model of the digital predistorter provided by this application.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used Describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present invention described herein can, for example, be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those clearly listed. Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

The technical solutions of the present invention will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

Fig. 1 is a first structural diagram of the signal generation system provided by this application. As shown in Fig. 1, the signal generation system includes: a power determination unit 11, a mode switching unit 21, a coefficient determination unit 31, and a signal generation unit 41, wherein,

The power determining unit 11 is respectively connected to the coefficient determining unit 31, the signal generating unit 41 and the mode switching unit 21; the signal generating unit 41 is respectively connected to the mode switching unit 21 and the coefficient determining unit 31;

The power determining unit 11 is configured to send the transmitting power of the terminal device in the first time 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 from at least one pre-stored predistortion coefficient combination according to the transmission power;

The mode switching unit 21 is configured to determine a target operating mode according to the transmission power, and output a target control voltage according to the target operating mode, the target operating mode being the envelope tracking ET mode or the average power tracking APT mode;

The signal generating unit 41 is configured to generate a signal to be sent according to the transmission power, the target predistortion coefficient combination, and the target control voltage.

Optionally, the terminal device may be a computer device, a tablet computer, or a mobile phone (or called a "cellular" phone), etc. The terminal device may also be a portable, pocket-sized, handheld, or built-in computer mobile device or device, where There are no special restrictions.

Specifically, the transmit power of the terminal device in the first period is determined by the terminal device according to the power and path loss scheduled by the base station in the second period. Among them, the first time period is after the second time period.

In this application, the at least one combination of predistortion coefficients may be a combination of predistortion coefficients that is calculated according to experiments and stored in the coefficient determination unit 31 in advance.

Optionally, the mode switching unit 21 is configured to determine the target operating mode according to a preset power threshold and transmission power.

For example, when the preset power threshold is greater than or equal to the transmit power, the average power tracking APT mode is determined as the target operating mode.

For example, when the preset power threshold is less than the transmit power, the envelope tracking ET mode is determined as the target operating mode.

In this application, the envelope tracking ET mode and the average power tracking APT mode appear in time sharing (that is, the signal generation system only works in one mode in the same time period), in which the envelope tracking ET mode and the average power tracking APT mode The demarcation point that appears in the mode time-sharing is the preset power threshold.

Optionally, the preset power threshold may be 20 decibel milliwatts (dBm), 30 dBm, or the like.

Further, when the target operating mode is the envelope tracking ET mode, the target control voltage is the control voltage whose voltage value can be changed in the first period of time, and when the target operating mode is the average power tracking APT mode, the target control voltage is in the first period of time. Control voltage with fixed internal voltage value.

In the signal generation system provided by the present application, the mode switching unit 21 determines the target operating mode according to the transmission power, and outputs the target control voltage according to the target operating mode. The target operating mode is the envelope tracking ET mode or the average power tracking APT mode , So that the signal generation system in the present application can switch to use the above two modes to generate the target control voltage in different time periods, reduce the power consumption of the signal generation system, and improve the efficiency of the signal generation system and the battery life time of the terminal device.

On the basis of the foregoing implementation, the signal generation system provided in the present application will be further described below in conjunction with FIG. 2. For details, please refer to FIG. 2.

Figure 2 is a second structural diagram of the signal generation system provided by this 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, and a first digital-to-analog converter (Digital-to-Analog converter). -Analog Converter (DAC) 240 and the mode determination module 250, in which,

The envelope determination module 210, the first delay processing module 220, the variable voltage determination module 230, the first digital-to-analog converter 240, and the mode determination module 250 are connected in sequence;

The envelope determining module 210 is also connected to the signal generating unit 41;

The mode determining module 250 is also connected to the signal generating unit 41 and the power determining unit 11 respectively.

The envelope determining module 210 is also connected to the signal processing module 420 in the signal generating unit 41, and the mode determining module 250 is also 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 used to determine the envelope waveform of the clipped signal output by the clipping processing sub-module 421 in the signal processing module 420, or used to determine the predistortion output by the digital predistorter 422 in the signal processing module 420. The envelope waveform of the signal is processed, and the envelope waveform is provided to the first delay processing module 220. For the connection relationship between the envelope determination module 210 and the signal processing module 420, please refer to the embodiment in FIG. 3. Here, it will not be repeated here.

Specifically, the first delay processing module 220 is configured to obtain the 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 sub-module 423 in the signal generating unit 41 to make the target control voltage reach the power amplifier 432 and the power amplifier 432 in the signal generating unit 41 receives the target pre-generated signal. Time match.

Specifically, the variable voltage determination 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 used 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 determination module 250.

Specifically, the mode determination module 250 is configured to determine the 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 the target control voltage.

In a possible design, the coefficient determination unit 31 includes: a coefficient determination module 310 and a coefficient output module 320, where:

The coefficient determination module 310 is respectively connected to the power determination unit 11 and the coefficient output module 320;

The coefficient output module 320 is also connected to the signal generating unit 41.

Among them, the coefficient output module 320 is connected to the signal processing module 420 in the signal generating unit 41.

Specifically, the coefficient determination module 310 is configured to determine a combination identifier corresponding to the transmission power according to the transmission power provided by the power determination unit 11 and a preset correspondence, and provide the combination identifier to the coefficient output module 320. The preset correspondence relationship includes at least one transmission power and a combination identifier corresponding to each transmission power, and each transmission power is different.

Specifically, the coefficient output module 320 is configured to store a table of predistortion coefficients, and the table of predistortion coefficients includes at least one combination of predistortion coefficients and a combination identifier of each combination of predistortion coefficients. Optionally, the number of predistortion coefficient tables may be multiple. Optionally, the combined identifier may be an index number, or other, where the index number corresponds to the transmission power in a one-to-one manner, for example, the index number may be 0, 1, 2, and so on. In practical applications, a combination of predistortion coefficients can be uniquely determined from at least one combination of predistortion coefficients included in the predistortion coefficient table through the combination identifier.

It should be noted that the structure of the predistortion coefficient table can be referred to the embodiment in FIG. 5, which 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 pre-stored predistortion coefficient combination according to the combination identifier, wherein the identifier of the target predistortion coefficient combination corresponds to the aforementioned combination identifier in a one-to-one manner. Or the same.

In a possible design, the signal generation unit 41 includes: an up-sampling processing module 410, a signal processing module 420, and a power processing module 430, where:

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 determining unit 31 respectively.

The signal processing module 420 is respectively connected to the envelope determination module 210 in the mode switching unit 21 and the coefficient output module in the coefficient determination unit 31.

Specifically, the up-sampling processing module 410 is configured to provide an up-sampling signal to the signal processing module 420.

Specifically, the signal processing module 420 is used to sequentially perform clipping processing, predistortion processing, delay matching processing, digital-to-analog conversion processing, and up-conversion processing on the up-sampled signal to obtain a pre-generated signal and provide it to the power processing module 430 Pre-generated signal.

Specifically, the power processing module 430 is configured to process the pre-generated signal according to the transmission power, the target pre-distortion coefficient combination, and the target control voltage to generate the signal to be sent. Among them, the signal to be sent has the same power and transmission power.

In the signal generation system provided by the present application, the envelope determination module 210, the first delay processing module 220, the variable voltage determination module 230, the first digital-to-analog converter 240, and the mode determination module 250 are connected in sequence; the envelope determination module 210 is also connected to the signal generating unit 41; the mode determining module 250 is also connected to the signal generating unit 41 and the power determining unit 11 respectively, so that the signal generating system can determine the target operating mode according to the transmission power. Further, the coefficient determining module 310 is respectively connected to the power determining unit 11 and the coefficient output module 320; the coefficient output module 320 is also connected to the signal generating unit 41, so that the signal generating system can determine the target predistortion coefficient combination according to the transmission power. In the above process, the target working mode corresponds to the target predistortion coefficient combination, so as to ensure the normal operation of the signal generation system.

Further, the signal generation system can flexibly switch between the ET mode and the APT mode according to the transmission power, so that the signal generation system can work in different working modes, which expands the application scenarios of the signal generation system.

On the basis of the foregoing embodiment, the signal generation system provided by the present application will be described in further detail in conjunction with FIG. 3. For details, please refer to FIG. 3.

Fig. 3 is the third structural diagram of the signal generation system provided by this application. On the basis of FIG. 2, as shown in FIG. 3, the first delay processing module 220 includes: a first delay sub-module 221 and a second delay sub-module 222, wherein,

The first delay sub-module 221 is respectively connected to the envelope determination module 210 and the second delay sub-module 222;

The second time delay sub-module 222 is also connected to the variable voltage determination module 230. Among them, the variable voltage determination module is a Power Voltage Table (PVT) module.

Specifically, the first delay sub-module 221 is configured to perform coarse delay matching adjustment processing on the envelope waveform to obtain the coarsely adjusted envelope waveform, and provide the coarsely adjusted envelope waveform to the second delay sub-module 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 coarse adjustment envelope waveform to obtain the envelope waveform to be transmitted.

In a possible design, the mode determination module 250 includes: an envelope tracking modulator (ETM) 251 and a working mode control sub-module 252, where:

The envelope tracking modulator 251 is respectively connected to the first digital-to-analog converter 240, the signal generating unit 41 and the working mode control sub-module 252;

The working mode control sub-module 252 is also connected to the power determining unit 11.

Wherein, the envelope tracking modulator 251 is connected to the power amplifier 432 in the signal generating unit 41.

Specifically, the working mode control sub-module 252 is configured to determine the target working mode according to the transmission power provided by the power determining unit 11, and provide the target working mode to the envelope tracking modulator 251.

Specifically, the envelope tracking modulator 251 obtains the target control voltage according to the target operating mode and the analog control voltage provided by the first digital-to-analog converter 240, and provides the target control voltage to the power amplifier 432.

In a possible design, the up-sampling processing module 410 includes: a baseband signal generation sub-module 411 and an up-sampling filter 412, where:

The baseband signal generation sub-module 411 is connected to the up-sampling filter 412;

The upsampling filter 412 is also connected to the signal processing module 420.

Wherein, the up-sampling filter 412 is connected to the clipping processing sub-module 421 in the signal processing module 420.

Specifically, the baseband signal generation sub-module 411 is used to produce baseband signals, and the up-sampling filter 412 provides the baseband signals. Optionally, the baseband signal is an information sequence composed of 0 and 1, for example, the information sequence is "110100".

Specifically, the up-sampling filter 412 is configured to perform up-sampling processing on the baseband signal to obtain an up-sampled signal, and provide the up-sampled signal to the clipping processing sub-module 421.

In a possible design, the signal processing module 420 includes: a clipping processing sub-module 421, a digital predistorter 422, a third delay sub-module 423, a second digital-to-analog converter 424, a carrier generator 425, and an up-conversion sub-module. Module 426, in which,

The clipping processing sub-module 421, the digital predistorter 422, the third delay sub-module 423, the second digital-to-analog converter 424, and the up-conversion sub-module 426 are connected in sequence;

The digital predistorter 422 is also connected to the coefficient determining unit 31;

The up-conversion sub-module 426 is connected to the carrier generator 425 and the power processing module 430 respectively.

Among them, the signal processing module 420 is connected to the envelope determination module 210.

Specifically, the envelope determination module 210 may be connected to the output terminal of the clipping processing sub-module 421, or connected to the output terminal of the digital predistorter 422 (connected by the dotted line in FIG. 3).

Specifically, the clipping processing sub-module 421 is configured to perform clipping processing on the up-sampling signal provided by the up-sampling filter 412 to obtain a clipping signal, and provide the clipping signal to the digital predistorter 422.

Specifically, the digital predistorter 422 is configured to perform predistortion processing on the clipped signal to obtain the predistortion processing signal, and provide the predistortion processing signal to the third delay submodule 423.

Specifically, the third delay sub-module 423 is configured to perform delay matching processing on the predistortion processing signal to obtain the delay matching signal, and provide the delay matching signal to the second digital-to-analog converter 424. Specifically, the third delay sub-module 423 cooperates with the first delay processing module 220 so that the time when the target control voltage reaches the power amplifier 432 matches the time of the target pre-generated signal 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 processing on the delay matching signal to obtain an analog signal, and the up-conversion sub-module 426 provides the analog signal.

Specifically, the up-conversion sub-module 426 is configured to perform up-conversion processing 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. Among them, the carrier generator 425 is used to generate a carrier signal.

Further, the up-conversion sub-module 426 includes a multiplier and a filter, where the multiplier is used for mixing the analog signal and the carrier signal to obtain a mixing signal, and providing the mixing signal to the filter, and the filter is used for mixing the analog signal and the carrier signal. The frequency signal is filtered to obtain a high frequency signal (ie, a pre-generated signal), and the pre-generated signal is provided to the power processing module 430.

In a possible design, the power processing module 430 includes: a variable gain amplifier 431, a power amplifier 432, and a power control sub-module 433, where:

The variable gain amplifier 431 is respectively connected to the up-conversion sub-module 426, the power amplifier 432 and the power control sub-module 433;

The power control sub-module 433 is also connected to the power determination 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 determining unit 11, so that the variable gain amplifier 431 has a target gain value.

Specifically, the variable gain amplifier 431 is used to process the target gain value and the pre-generated signal provided by the up-conversion sub-module 426 to obtain the target pre-generated signal, and provide the target pre-generated signal to the power amplifier 432.

Specifically, the power amplifier 432 is used to amplify the target pre-generated signal according to the target control voltage provided by the envelope tracking modulator 251 to obtain the signal to be transmitted.

In the embodiment of FIG. 3, the power determination unit 311, the coefficient determination module 310, the coefficient output module 320, and the digital predistorter 422 are connected in sequence, so that the coefficient output module 320 can provide the digital predistorter 422 with target predistortion corresponding to the transmit power. The coefficient combination improves 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 structure of the digital predistorter 422 can be dynamically changed by combining the target predistortion coefficient in the ET mode and the target predistortion in the APT mode. The coefficient combination is adjusted to achieve.

On the basis of the above-mentioned embodiment, the signal generation system also provided in the present application may further include: a coefficient training unit, wherein:

The coefficient training unit is respectively connected to the signal generating unit 41 and the coefficient determining unit 31;

The coefficient training unit provided in the present application will be described in detail below in conjunction with the embodiment of FIG. 4. For details, please refer to FIG. 4.

Figure 4 is a fourth structural diagram of the signal generation system provided by this application. On the basis of Fig. 3, as shown in Fig. 4, the coefficient training unit includes: training control module 510, timer 520, data acquisition module 530, analog-to-digital converter (ADC) 540, down-conversion The module 550, the coupling switch 560 and the coefficient calculation module 570, in which,

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 also 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 generating unit 41 respectively.

The data acquisition module 530 is connected to the output end of the up-sampling filter 412 in the signal generating unit 41, and the down-conversion module 550 is connected to the carrier generator 425 in the signal generating unit 41.

Specifically, the training control module 510 is configured to detect the transmission power provided by the power determination unit 11 according to the timing interval of the timer 520, and when it is determined that the transmission power is greater than or equal to the preset power threshold, the training control module 510 sends a request to the data acquisition module 530 provides a trigger signal. Optionally, the timing interval may be 10 milliseconds (ms), 20 ms, and so on. Optionally, the preset power threshold is 20 dBm, 30 dBm, and so on.

For example, the preset power threshold is 20 dBm and the timing interval is 10 ms. The training control module 510 detects the transmission power every 10 ms. If the transmission power is detected as 22 dBm, the training control module 510 provides a trigger signal to the data acquisition module 530.

Specifically, the coupling switch 560 is used to couple the signal to be sent to the down-conversion module 550.

Specifically, the down-conversion module 550 is configured to perform down-conversion processing on the signal to be sent and the carrier signal provided by the carrier generator 425 to obtain a baseband sampling signal, and send the baseband sampling signal to the data acquisition module 530.

Specifically, the data collection module 530 is configured to collect information on the baseband sampling signal according to the trigger signal provided by the training control module 510 to obtain the baseband signal data information, and collect information on the upsampling signal provided by the upsampling filter 412 to obtain the sampling Data information, and provide baseband signal data information and sampling data information to the coefficient calculation module 570.

Specifically, the coefficient calculation module 570 is configured to calculate the predistortion coefficient combination according to the baseband signal data information and the sampling data information, and then determine whether the predistortion coefficient included in the predistortion coefficient combination meets the requirement according to the preset coefficient range. If each predistortion coefficient is within the preset coefficient range, it is determined that the combination of predistortion coefficients meets the requirement, and the combination of predistortion coefficients is provided to the coefficient output module 320. So that the coefficient output module 320 stores the combination of predistortion coefficients in the predistortion coefficient table, where the combination identifier corresponds to the transmission power provided by the power determination unit 11.

It should be noted that the power determination unit 11 may provide the coefficient output module 320 with transmission power through the training control module 510 and the data acquisition module 530, so that the coefficient output module 320 configures a combination identifier for the combination of predistortion coefficients according to the transmission power; or power The determining unit 11 may provide the transmission power to the data acquisition module 530 through the training control module 510. The data acquisition module 530 configures a combination identification for the transmission power and provides the combination identification to the coefficient output module 320 so that the coefficient output module 320 stores the combination identification.

FIG. 5 is a schematic diagram of the predistortion coefficient table provided by this application. As shown in FIG. 5, the predistortion coefficient table includes: the first group of predistortion coefficient combinations, the combination identifier 0 corresponding to the first group of predistortion coefficient combinations, the second group of predistortion coefficient combinations, and the corresponding combination of the second group of predistortion coefficients. Combination ID 1, the third group of pre-distortion coefficient combinations, the combination ID corresponding to the third group of pre-distortion coefficient combinations 2, the fourth group of pre-distortion coefficient combinations, the combination ID corresponding to the fourth group of pre-distortion coefficient combinations 3, the fifth group of pre-distortion coefficient combinations Combination ID 4 corresponding to the combination of distortion coefficients and the fifth group of predistortion coefficient combinations.

Optionally, the combination of the predistortion coefficients may also include the transmit power and the target working module (in the ET mode or the APT mode). For example, the first combination of predistortion coefficients includes the first transmit power and the ET mode.

It should be noted that the number of predistortion coefficients in the combination of predistortion coefficients in ET mode and APT mode is the same, and the format of each predistortion coefficient in the combination of predistortion coefficients in ET mode and APT mode is uniform, for example, The format can be a floating point type, with two decimal places. Fig. 5 exemplarily shows five combinations of predistortion coefficients, and the specific number of combinations of predistortion coefficients is not particularly limited in this application.

In the application, the coverage of the transmission power corresponding to the ET mode and the APT mode can be planned according to the efficiency of the power amplifier model.

It should be noted that when the predistortion coefficient table includes the target working module type and the transmission power, when the transmission power is less than or equal to the preset power threshold, the target working module is APT mode, and when the transmission power is greater than the preset power threshold, the target working module The formula is ET mode.

In this application, in the predistortion coefficient table shown in FIG. 5, the preset power threshold is the fourth transmit power.

On the basis of the foregoing embodiment, the present application also provides a relationship between the efficiency of the signal generation system and the working mode under different transmission power conditions. The details are shown in Figure 6.

FIG. 6 is a schematic diagram of the relationship between the efficiency of the signal generation system and the working mode under different transmission power conditions provided by this application. 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 transmission power is greater than or equal to the preset power threshold, 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.

In this application, the signal to be transmitted is a service signal. When the bandwidth of the service signal is different, the preset power threshold is usually different under the same transmission power condition.

For example, when the same transmit power is 23 dBm, if the bandwidth of the service signal is 20 megahertz (MHz), the preset power threshold is 19 dBm, and if the bandwidth of the service signal is 40 MHz, 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 19 dBm, when the transmit power is less than or equal to 19 dBm, the efficiency of the signal generation system in ET mode is less than or equal to that of the signal generation system in APT mode. Efficiency, that is, the signal generation system adopts the APT mode. When the transmission power is greater than 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 adopts the ET mode.

In this application, under the same transmit power condition, the predistortion coefficient tables corresponding to the bandwidths of different service signals are usually different. It should be noted that when the transmission power remains unchanged and the bandwidth of the service signal changes, the signal generation system needs to be reinitialized, and after the initialization, the predistortion coefficient table corresponding to the bandwidth of the changed service signal must be re-acquired.

On the basis of the foregoing embodiment, the working model of the digital predistorter provided in the present application will be described below in conjunction with FIG. 7. For details, please refer to FIG. 7.

Fig. 7 is a working model of the digital predistorter provided by this application. As shown in FIG. 7, the clipped signal provided by the clipping processing sub-module 421 to the digital predistorter 422 includes the in-phase branch signal I and the quadrature branch signal Q. The digital predistorter 422 receives the in-phase branch signal I and After the quadrature branch signal Q, the pre-processing unit inside the digital predistorter 422 delays the in-phase branch signal I and performs weighted adjustment processing on the amplitude of the in-phase branch signal I to obtain the delayed in-phase branch signal I1, I2,..., In, delay processing the quadrature branch signal Q, and perform weighted adjustment processing on the amplitude of the orthogonal branch signal Q, to obtain delayed quadrature branch signals Q1, Q2,... In.

Further, the target predistortion coefficient combination includes predistortion coefficients P_1_I to P_n_I, predistortion coefficients P_1_Q to P_n_Q, where the delayed in-phase branch signal I1 and the delayed quadrature branch signal Q1 are combined with the predistortion coefficient P_1_I and predistortion coefficients. The coefficient P_1_Q is complex multiplied, namely (I1+i*Q1)*(P_1_I+i*P_1_Q), the delayed in-phase branch signal I2 and the delayed quadrature branch signal Q2 are multiplied by the predistortion coefficient P_2_I and the predistortion coefficient P_2_Q , That is (I2+i*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 by the predistortion coefficient P_n_I and the predistortion coefficient P_n_Q, namely (In+i*Qn)*(P_n_I+i*P_n_Q), accumulate the real part of the above n complex multiplication results to get the in-phase output signal P_out_I, and accumulate the imaginary part of the above n complex multiplication results The quadrature output signal P_out_Q, wherein the in-phase output signal P_out_I and the quadrature output signal P_out_Q are included in the predistortion processing signal, the real part of the predistortion processing signal is the in-phase output signal P_out_I, and the imaginary part is the quadrature output signal P_out_Q. Among them, the above i is an imaginary number.

In this application, when the target working mode of the signal generation system is different (ET mode or APT mode), and the nonlinear characteristics of the power amplifier are different, the structure of the digital predistorter 422 required is also different. Therefore, it can be adjusted The predistortion coefficient in the target predistortion coefficient combination is changing the non-linear characteristics of the power amplifier, thereby changing the target operating mode of the signal generation system.

It should be noted that the digital predistorter 422 also includes a complex filter.

For example, the target operating mode is APT mode. If the complex filter in the digital predistorter 422 requires a third-order complex filter to meet the performance requirements of the signal generation system, then the target predistortion coefficient combination of the corresponding digital predistorter 422 It suffices to include 6 predistortion coefficients, namely P_1_I, P_1_Q, P_2_I, P_2_Q, P_3_I, P_3_Q.

For example, if the target working mode is ET mode, if the complex filter in the digital predistorter 422 requires 5th-order complex filtering to meet the performance requirements of the signal generation system, then the target predistortion coefficient combination of the corresponding digital predistorter 422 It is sufficient to include 10 predistortion coefficients, namely 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 includes 10 predistortion coefficients, namely 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. Then the target predistortion coefficient combinations P_1_I, P_1_Q, P_2_I, P_2_Q, P_3_I, P_3_Q corresponding to the APT mode can be extended to target predistortion coefficient combinations P_1_I, P_1_Q, P_2_I, P_2_Q, P_3_I, P_3_Q, 0, 0, 0, 0 , So that the number of predistortion coefficients included in the target predistortion coefficient combination in the APT mode and the ET mode is the same.

Similarly, in 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 can be extended to the target predistortion Coefficient combinations P_1_I, P_1_Q, P_2_I, P_2_Q, 0, 0, P_4_I, P_4_Q, 0, 0, so that the number of predistortion coefficients included in the target predistortion coefficient combination in APT and ET modes is the same.

In this 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 the signal generation system provided with the digital predistorter 422 Can switch between two working modes.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of the present invention. range.

Claims

A signal generation system is characterized in that it is applied to terminal equipment and includes: a power determination unit, a mode switching unit, a coefficient determination unit, and a signal generation unit, wherein:

The power determining unit is respectively connected to the coefficient determining unit, the signal generating unit and the mode switching unit; the signal generating unit is respectively connected to the mode switching unit and the coefficient determining unit;

The power determining unit is configured to send the transmitting power of the terminal device in the first time period to the coefficient determining unit, the signal generating unit, and the mode switching unit;

The coefficient determining unit is configured to determine a target predistortion coefficient combination from at least one pre-stored predistortion coefficient combination according to the transmission power;

The mode switching unit is configured to determine a target operating mode according to the transmission power, and output a target control voltage according to the target operating mode, and the target operating mode is an envelope tracking ET mode or an average power tracking APT mode ；

The signal generating unit is configured to generate a signal to be transmitted according to the transmission power, the target predistortion coefficient combination, and the target control voltage.
The system according to 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 determination module, the first delay processing module, the variable voltage determination module, the first digital-to-analog converter, and the mode determination module are connected in sequence;

The envelope determining module is also connected to the signal generating unit;

The mode determination module is also connected to the signal generation unit and the power determination unit respectively.
The system according to claim 2, wherein the first delay processing module comprises: a first delay sub-module and a second delay sub-module, wherein:

The first delay sub-module is respectively connected to the envelope determination module and the second delay sub-module;

The second time delay sub-module is also connected to the variable voltage determination module.
The system according to claim 2, wherein the mode determination module comprises: an envelope tracking modulator and a working 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 sub-module;

The working mode control sub-module is also connected to the power determination unit.
The system according to claim 1, wherein the coefficient determination unit comprises: a coefficient determination 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 to the signal generating unit.
The system according to claim 1, wherein the signal generating 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 connected to the mode switching unit and the coefficient determining unit respectively.
The system according to claim 6, wherein the up-sampling processing module comprises: a baseband signal generating sub-module and an up-sampling filter, wherein,

The baseband signal generating sub-module is connected to the upsampling filter;

The upsampling filter is also connected to the signal processing module.
The system according to claim 7, wherein the signal processing module comprises: a clipping processing sub-module, a digital predistorter, a third delay sub-module, a second digital-to-analog converter, a carrier generator, and an up-conversion Sub-modules, of which,

The clipping processing sub-module, the digital predistorter, the third delay sub-module, the second digital-to-analog converter and the up-conversion sub-module are connected in sequence;

The digital predistorter is also connected to the coefficient determining unit;

The up-conversion sub-module is also connected to the carrier generator and the power processing module respectively.
The system according to 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 to the up-conversion sub-module, the power amplifier and the power control sub-module;

The power control sub-module is also connected to the power determination unit;

The power amplifier is also connected to the mode switching unit.
The system according to claim 1, wherein the system further comprises: a coefficient training unit, wherein:

The coefficient training unit is respectively connected to the signal generation unit and the coefficient determination unit;

The coefficient training unit is configured to determine the at least one combination of predistortion coefficients according to the signal to be sent.
The system according to 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 connected to the analog-to-digital converter, the coefficient calculation module and the signal generation unit respectively;

The down-conversion module is also connected to the coupling switch and the signal generating unit respectively.
A terminal device, characterized in that the terminal device comprises the signal generation system according to any one of claims 1 to 11.