WO2019196769A1

WO2019196769A1 - Pre-distorsion processing method and device and communication equipment

Info

Publication number: WO2019196769A1
Application number: PCT/CN2019/081689
Authority: WO
Inventors: 肖宇翔; 朱尔霓; 李珽; 尤览
Original assignee: 华为技术有限公司
Priority date: 2018-04-08
Filing date: 2019-04-08
Publication date: 2019-10-17
Also published as: CN110351218A; CN110351218B

Abstract

The present application relates to the communication technology field and in particular relates to a pre-distortion processing method and device and a communication equipment. According to the pre-distortion processing method and device and the communication equipment provided in the present application, an analog signal is subjected to vector modulation to implement a pre-distortion processing; a vector modulation factor is determined by table look-up according to the amplitude of the analog signal; therefore, the complexity of the pre-distortion processing, the power consumption and the implementation costs are reduced

Description

Predistortion processing method, device and communication device

Technical field

The present application relates to the field of communications technologies, and in particular, to a predistortion processing method, apparatus, and communication device.

Background technique

In wireless signal transmitting equipment, the distortion of the transmitted signal caused by the power amplifier (PA) operating in its non-linear region is one of the key factors affecting the communication quality. Predistortion (PD) technology is a commonly used method to solve PA distortion, which can improve PA efficiency by reducing the distortion generated when PA operates in its nonlinear region.

FIG. 1 shows a schematic diagram of a system structure including predistortion processing. The RF signal RF1 is divided into two paths, and one time is subjected to delay processing to generate a delayed RF signal RF2, and one is used as a predistortion processing module and a predistortion training module. Input signal RFin. The predistortion training module calculates the predistortion coefficient using the RFin signal and the feedback signal RFfb coupled back from the power amplifier output port, and then transmits the predistortion coefficient to the predistortion processing module. The predistortion processing module performs predistortion processing on the RFin signal according to the predistortion coefficient to obtain the processed predistortion signal RFout. The RFout signal is mixed with the RF2 signal through the coupler to obtain the RF3 signal as the input signal of the PA.

In the existing system including predistortion processing, because the predistortion processing module needs to implement a complex nonlinear signal processing process, which requires high cost and power consumption, how to implement a low cost, low power predistortion processing system, It is an urgent problem to be solved in wireless signal processing research.

Summary of the invention

This paper describes a predistortion processing device and communication device that determines the predistortion coefficient based on the signal amplitude based look-up table and performs vector modulation on the analog RF signal to implement pre-distortion processing of the analog RF signal, thereby avoiding complicated non- Linear signal processing reduces the implementation and design cost of the predistortion processing system and saves power during the operation of the predistortion system.

In a first aspect, an embodiment of the present application provides a predistortion processing apparatus, where the apparatus includes an orthogonal phase shifting module, an envelope detection module, a coefficient selection module, a multiplication module, and a first addition module. The quadrature phase shifting module is configured to receive an analog signal, and generate an in-phase component signal and a quadrature component signal according to the analog signal; the envelope detecting module is configured to receive the analog signal, and generate an envelope according to the analog signal. a signal selection module coupled to the envelope detection module for determining a vector modulation coefficient by looking up a table according to an amplitude of the envelope signal, and outputting a real part and an imaginary part of the vector modulation coefficient; a multiplication module and And a quadrature phase shifting module coupled to the coefficient selecting module for multiplying the in-phase component signal by a real part of the vector modulation coefficient to obtain a pre-distorted in-phase component signal, and the quadrature component signal and the Multiplying the imaginary part of the vector modulation factor to obtain a predistorted quadrature component signal; the first summing module is coupled to the multiplication module for receiving the predistorted inphase component signal and the predistorted quadrature component signal and The pre-distorted in-phase component signal is added to the pre-distorted quadrature component signal to obtain a pre-distorted analog signal. The predistortion processing of the signal is realized by vector modulation of the analog signal, and the vector modulation coefficient is obtained based on the signal amplitude look-up table, which avoids complicated nonlinear calculation and nonlinear signal processing, and reduces the complexity of the predistortion processing device. Implementation costs and power consumption during operation.

In a possible design, the coefficient selection module is further configured to determine and output a DC compensation amount by looking up a table according to the amplitude of the envelope signal; the first adding module is further configured to use the DC compensation amount Adding to the predistortion analog signal to obtain a DC compensated predistortion analog signal. In the pre-distortion process, the DC compensation amount is increased, and the pre-distortion signal can be compensated for the DC offset generated in the system, thereby improving the pre-distortion processing effect, and at the same time, determining different DC compensation amounts according to the amplitude of the signal, which can be more flexible for DC. The offset is compensated to further improve the pre-distortion processing effect, thereby improving system performance.

In a possible design, the coefficient selection module includes a coefficient index determiner, a selector and at least one comparator; the at least one comparator is connected to the envelope detection module for An amplitude and amplitude segmentation threshold set of the network signal determines an amplitude segment to which the envelope signal belongs, and transmits the determination signal of the amplitude segment to the coefficient index determiner, wherein the amplitude segmentation threshold set Include K amplitude segmentation thresholds, the K being an integer greater than or equal to 1; the coefficient index determiner being coupled to the at least one comparator for receiving the determination signal of the amplitude segment, and Determining an index of the vector modulation coefficient by looking up a table according to the amplitude segment, and transmitting the index to the selector; the selector is connected to the coefficient index determiner for receiving the Indexing, and determining the vector modulation coefficient according to the index and the set of vector modulation coefficients, and outputting a real part and an imaginary part of the vector modulation coefficient, wherein the vector modulation coefficient set It includes K modulation factor vectors. Optionally, when the coefficient selection module is further configured to determine a DC compensation amount, the coefficient selection module may include at least one selector, and the coefficient index determiner is further configured to pass the amplitude segmentation according to the amplitude Determining an index of the DC compensation amount, and transmitting an index of the DC compensation amount to the at least one selector, wherein the at least one selector is further configured to perform an index according to the DC compensation amount and a DC compensation amount The set determines the DC compensation amount, and outputs the DC compensation amount, wherein the DC compensation amount set includes K DC compensation amounts.

In a possible design, the coefficient selection module is further configured to determine a vector modulation coefficient component and/or a DC compensation component according to a magnitude of the delayed envelope signal, wherein the vector modulation coefficient component is used to generate the vector a modulation factor, the DC compensation amount component being used to generate the DC compensation amount. In the pre-distortion process, the vector modulation coefficient and/or the DC compensation component are determined according to the delayed analog signal (or the envelope signal of the analog signal), and the memory feature of the system can be pre-distorted in the presence of the memory feature of the system. Processing to improve system performance.

Optionally, the coefficient selection module includes a delay module, a second addition module, a first coefficient component selection module, and at least one second coefficient component selection module; and the delay module is coupled to the envelope detection module a connection, configured to delay the envelope signal to obtain a delayed envelope signal; the first coefficient component selection module, configured to determine a first vector modulation coefficient component by using a lookup table according to the amplitude of the envelope signal, And outputting a real part and an imaginary part of the first vector modulation coefficient component; the at least one second coefficient component selecting module is connected to the delay module for using an amplitude of the delayed envelope signal Determining at least one second vector modulation coefficient component by looking up a table, and outputting a real part and an imaginary part of the at least one second vector modulation coefficient component; the second adding module, and the first coefficient component selecting module and The at least one second coefficient component selection module is coupled to integrate the real part of the first vector modulation coefficient component with the real part of the at least one second vector modulation coefficient component Obtaining the real part of the coefficient vector modulation, and the modulation factor of said first vector component is the imaginary portion of the at least one second imaginary vector components of the modulation factor to obtain an imaginary part of the accumulating portion vector modulation factor.

Optionally, the coefficient selection module includes a delay module, a second addition module, a first coefficient component selection module, and at least one second coefficient component selection module; and the delay module is coupled to the envelope detection module a connection, configured to delay the envelope signal to obtain a delayed envelope signal; the first coefficient component selection module, configured to determine the first DC compensation component by looking up the table according to the amplitude of the envelope signal And outputting; the at least one second coefficient component selecting module is connected to the delay module, configured to determine at least one second DC compensation component by the look-up table according to the amplitude of the delayed envelope signal and output The second adding module is connected to the first coefficient component selecting module and the at least one second coefficient component selecting module, configured to use the first DC compensation component and the at least one second The DC compensation amount components are accumulated to obtain the DC compensation amount.

In a possible design, the predistortion processing apparatus further includes: an analog to digital conversion module and a digital to analog conversion module; the analog to digital conversion module, configured to receive the package of the analog domain output by the envelope detection module a signal, which converts an envelope signal of the analog domain into an envelope signal of a digital domain and outputs the signal to the coefficient selection module; the digital-to-analog conversion module is configured to receive a digital domain output by the coefficient selection module The real part and the imaginary part of the vector modulation coefficient are described, and the real part and the imaginary part of the vector modulation coefficient of the digital domain are converted into real and imaginary parts of the vector modulation coefficient of the analog domain, and output to the multiplication module. The coefficient selection module works in the digital domain to achieve a more accurate look-up table and improve pre-distortion performance.

In a possible design, the coefficient selection module is further configured to receive at least one of an amplitude segmentation threshold set and a vector modulation coefficient set, and according to the amplitude of the envelope signal and the at least one set, The table determines the vector modulation coefficient, wherein the amplitude segmentation threshold set includes K amplitude segmentation thresholds, and the vector modulation coefficient set includes K vector modulation coefficients, where K is an integer greater than or equal to . Optionally, the coefficient selection module is further configured to receive a DC compensation quantity set, and determine, according to the amplitude of the envelope signal and the DC compensation quantity set, a DC compensation quantity by using a lookup table, wherein the DC compensation quantity The set includes K DC compensation amounts, and the K is an integer greater than or equal to 1. The amplitude segmentation threshold set, the vector modulation coefficient set or the DC compensation quantity set can be transformed in real time according to changes in the system or signal characteristics, thereby providing a more flexible amplitude segmentation mode, mass modulation coefficient or DC compensation amount, further improving the pre- Distortion performance.

In a second aspect, the embodiment of the present application provides a communication device, including the predistortion processing apparatus described in the first aspect or any possible design of the first aspect. The communication device includes various forms of wireless transceiver devices, such as base stations, user equipment, and the like.

In a third aspect, the present application provides a chip system for implementing the predistortion processing apparatus of the first aspect or any of the possible designs of the first aspect. The chip system can be composed of chips, and can also include chips and other discrete devices. The chip may be an Application-Specific Integrated Circuit (ASIC) or other form of chip. Optionally, the chip system may further include a processor, configured to support the predistortion processing device to implement the functions involved in the foregoing aspects, for example, acquiring signals and/or parameters involved in the foregoing aspects, in performing the foregoing aspects. Predistortion processing. In one possible design, the chip system further includes a memory for storing program instructions and data necessary for the predistortion processing device.

In a fourth aspect, the embodiment of the present application provides a predistortion processing method, including: generating an inphase component signal and a quadrature component signal according to an analog signal; generating an envelope signal according to the analog signal; and passing the amplitude of the envelope signal according to the fourth embodiment; Determining a vector modulation coefficient; multiplying the in-phase component signal by a real part of the vector modulation coefficient to obtain a pre-distorted in-phase component signal, multiplying the orthogonal component signal by an imaginary part of the vector modulation coefficient Obtaining a predistorted quadrature component signal, adding the predistorted inphase component signal and the predistorted quadrature component signal to obtain a predistortion analog signal.

In a possible design, the method further includes: determining, according to the amplitude of the envelope signal, a DC compensation amount by looking up a table; adding the DC compensation amount to the predistortion analog signal to obtain DC compensation Pre-distorted analog signal.

In a possible design, determining a vector modulation coefficient by looking up a table according to the amplitude of the envelope signal comprises: determining, according to the amplitude and amplitude segmentation threshold set of the envelope signal, an amplitude segment to which the envelope signal belongs And wherein the amplitude segmentation threshold set includes K amplitude segmentation thresholds, and the K is an integer greater than or equal to 1; determining the vector according to the amplitude segment and the vector modulation coefficient set to which the envelope signal belongs a modulation factor, wherein the vector modulation coefficient set includes K vector modulation coefficients.

In a possible design, determining the vector modulation coefficient by looking up the table according to the amplitude of the envelope signal comprises: determining, according to the amplitude of the envelope signal and the amplitude of the delayed envelope signal, by looking up the table The vector modulation factor. Optionally, determining, according to the amplitude of the envelope signal and the amplitude of the delayed envelope signal, determining the vector modulation coefficient by using a lookup table, including: determining, by using a lookup table, the first according to the amplitude of the envelope signal a vector modulation coefficient component, wherein at least one second vector modulation coefficient component is determined by looking up a table according to an amplitude of the delayed envelope signal; adding the first vector modulation coefficient component to the at least one second vector modulation coefficient component, The vector modulation factor is obtained.

In a possible design, the determining, by the lookup table, the DC compensation amount according to the amplitude of the envelope signal comprises: determining, according to the amplitude and amplitude segmentation threshold set of the envelope signal, the amplitude to which the envelope signal belongs a segment, wherein the amplitude segmentation threshold set includes K amplitude segmentation thresholds, and the K is an integer greater than or equal to 1; determining, according to the amplitude segment and the DC compensation amount set to which the envelope signal belongs The DC compensation amount includes K DC compensation amounts in the DC compensation amount set.

In a possible design, the determining, by the lookup table, the DC compensation amount according to the amplitude of the envelope signal, comprising: determining, according to the amplitude of the envelope signal and the amplitude of the delayed envelope signal, by looking up the table The amount of DC compensation. Optionally, determining, according to the amplitude of the envelope signal and the amplitude of the delayed envelope signal, determining the DC compensation amount by using a lookup table, including: determining, by using a lookup table, the first according to the amplitude of the envelope signal a DC compensation component; determining at least one second DC compensation component by looking up the table according to the amplitude of the delayed envelope signal; accumulating the first DC compensation component and the at least one second DC compensation component The DC compensation amount is obtained.

In combination with the above possible design, the envelope signal can be an envelope signal in analog form or an envelope signal in digital form. Any one or more of the set of amplitude segmentation thresholds, vector modulation coefficients, and DC compensation quantities may be dynamically changed.

DRAWINGS

Embodiments of the present application will be described below with reference to the accompanying drawings.

1 is a schematic structural diagram of a predistortion processing system according to the present application;

2 is a schematic structural diagram of a communication device according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a predistortion processing apparatus according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a coefficient selection module according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of another predistortion processing apparatus according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of another coefficient selection module according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of still another pre-distortion processing apparatus according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of still another pre-distortion processing apparatus according to an embodiment of the present disclosure;

FIG. 9 is a flowchart of a pre-distortion processing method according to an embodiment of the present application.

detailed description

The embodiments of the present application will be described below with reference to the accompanying drawings.

The embodiments of the present application can be applied to a Long Term Evolution (LTE) system and subsequent evolution systems, such as a new radio (NR) system, a 5th generation mobile communication (5G) system, and the like. It can also be applied to wireless communication systems of the Universal Mobile Telecommunications System (UMTS), Global System for Mobile Communication (GSM), etc., and can also be applied to other communications that require pre-distortion processing. A system and a communication device in the communication system. The communication device to which the solution and/or device provided by the embodiment of the present application is applied may be a base station in a wireless communication system, or may be another device or device that needs to implement pre-distortion processing, such as a terminal device, a relay device, or the like. The base station described in this application may include various forms of macro base stations, micro base stations, relay stations, access points, or remote radio units (RRUs). In different systems, the name of a device with a base station function may be different, for example, in an LTE network, called an evolved NodeB (eNB or eNodeB), in the 3rd Generation (3G) In the network, it is called Node B and so on. The terminal device described in the present application may include various handheld devices having wireless communication functions, in-vehicle devices, wearable devices, computing devices, control devices, machine communication devices, or other devices connected to a wireless modem, and various forms of users. User equipment (UE), mobile station (MS), terminal or terminal equipment.

FIG. 2 is a schematic structural diagram of a communication device to which an embodiment of the present application may be applied. The communication device includes a baseband signal processing module, a radio frequency signal processing module, and an antenna connected to the radio frequency signal processing module. The radio frequency signal processing module can include at least one transmit link and at least one receive link. In the transmitting link, the baseband signal processed by the baseband signal processing module is transmitted to the radio frequency signal processing module through the interface of the baseband signal processing module and the radio frequency signal processing module, and the radio frequency signal is obtained after being processed by the transmitting link in the radio frequency signal processing module. The radio frequency signal is transmitted through an antenna; in the receiving link, the radio signal received by the antenna is processed by the receiving link of the radio frequency signal processing module, converted into a baseband signal, and transmitted to the interface of the baseband signal processing module and the radio frequency signal processing module to The baseband signal processing module performs baseband signal processing in the baseband signal processing module. In the transmit link, the processing of the signal by the baseband signal processing module may include precoding, modulation, etc., and the processing of the signal by the radio frequency signal processing module may include clipping processing, predistortion processing, precoding, upconversion, power amplification, and the like. In the receiving link, the processing of the signal by the radio frequency signal processing module may include low noise amplification processing, down conversion, etc., and the processing of the signal by the baseband signal processing module may include equalization, demodulation, decoding, and the like. The radio frequency signal processing module may further include a duplexer connected between the transmitting link, the receiving link, and the antenna. The specific processing algorithm and processing sequence of the signals in the baseband signal processing module and/or the radio frequency signal processing module are not limited. The communication device may be a base station, and the baseband signal processing module may be a baseband unit (BBU) of the base station, where the radio frequency signal processing unit may be a radio unit (RU) of the base station, and a radio frequency unit (radio frequency) Unit, RFU) or remote radio unit (RRU). The communication device may also be a terminal device, and the baseband signal processing module may be a baseband signal processing chip or a baseband signal processing circuit in the terminal device, and the radio frequency signal processing module may be a radio frequency signal processing circuit or a radio frequency signal in the terminal device. Processing the chip. Of course, the communication device may also include other functional modules, which are not limited in this application.

In one example, the predistortion processing method and/or apparatus provided by the embodiments of the present application may be applied to a transmit link process of a radio frequency signal processing module.

The term “and/or” in the present application is merely an association relationship describing an associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately, and A and B exist simultaneously. There are three cases of B. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

The solution provided by the embodiments of the present application will be described in more detail below with reference to the accompanying drawings.

FIG. 3 is a schematic structural diagram of a predistortion processing apparatus according to an embodiment of the present application. The predistortion processing apparatus includes: an orthogonal phase shifting module, an envelope detecting module, a coefficient selecting module, a multiplication module, and a first adding module. The quadrature phase shifting module is configured to receive an analog signal, and generate an in-phase component signal and a quadrature component signal according to the analog signal. The envelope detection module is configured to receive the analog signal and generate an envelope signal according to the analog signal. The coefficient selection module is connected to the envelope detection module for determining a vector modulation coefficient by looking up a table according to the amplitude of the envelope signal, and outputting a real part and an imaginary part of the vector modulation coefficient. The multiplication module is coupled to the quadrature phase shifting module and the coefficient selection module for multiplying the in-phase component signal by a real part of the vector modulation coefficient to obtain a pre-distorted in-phase component signal, and The quadrature component signal is multiplied by an imaginary part of the vector modulation coefficient to obtain a predistorted quadrature component signal. The first adding module is connected to the multiplication module, configured to receive the pre-distorted in-phase component signal and the pre-distorted quadrature component signal, and the pre-distorted in-phase component signal and the pre- The distorted orthogonal component signals are added to obtain a predistortion analog signal.

As shown in FIG. 3, the predistortion processing apparatus receives the analog signal X(t) and divides the analog signal X(t) into two paths, one path is divided into the in-phase component signals X _I (t) and orthogonal by the orthogonal phase shifting module. The component signal X _Q (t), the other analog signal X(t), obtains the envelope signal |X(t)| ² through the envelope detection module. Wherein, the analog signal X(t) is divided into two paths, which can be implemented by a device such as a coupler and a power splitter. This application does not limit the generation of the in-phase component signal X _I (t) and the quadrature component according to the analog signal X(t). The specific algorithm and implementation of the signal X _Q (t) and the envelope signal |X(t)| ² according to the analog signal X(t) are not limited herein. Optionally, the quadrature phase shifting module may include a quadrature phase shifter (QPS) to implement the foregoing function, and the envelope detecting module may include an envelope detector (EDET) to implement the foregoing function, of course. The orthogonal phase shifting module and/or the envelope detecting module can also be implemented by other forms, such as an integrated circuit, a discrete device, etc., which is not limited in this application. Optionally, the analog signal X(t) may be a service signal, such as an orthogonal frequency division multiplexing (OFDM) symbol carrying service data, or may be a signal dedicated to pre-distortion processing. The signal can also be an OFDM symbol.

Coefficient selection module based on the envelope signal | X (t) | ² in the lookup table pre-generated vectors are required modulation factor. Specifically, the coefficient selection module may determine, according to the envelope signal |X(t)| ^2, an amplitude segment i, i=1, . . . , K at which the envelope signal is located, and a vector modulation coefficient A corresponding to the i-th segment. _{i is} the vector modulation factor that needs to be used. Where K is the number of amplitude segments, K is an integer greater than or equal to 1, and the thresholds for different amplitude segments are β _i , i=1, . . . , K. In the specific implementation, the amplitude segmentation mode may be adjusted according to system requirements, such as the amplitude characteristics of the input signal, etc., specifically, the values of the adjustment thresholds β _i , i=1, . . . , K, for example, the threshold β _i , i = 1, ..., K can take the value of β _i = (i / K) · β _K , i = 1, ..., K, to achieve uniform segmentation, where β _K is the maximum amplitude value allowed by the system . Optionally, the vector modulation coefficients A _i , i=1, . . . , K are complex numbers, and the real part is used for multiplication with the in-phase component signal, and the imaginary part is used for multiplication with the quadrature component signal.

The coefficient selection module may be implemented in the form of a chip, an integrated circuit or a discrete device, or may be implemented by a combination of the above different devices, which is not limited in this application. In one example, the coefficient selection module can include a coefficient index determiner, a selector, and at least one comparator. And the at least one comparator is connected to the envelope detection module, configured to determine an amplitude segment to which the envelope signal belongs according to the amplitude and amplitude segmentation threshold set of the envelope signal, and send the determination signal of the amplitude segment to the A coefficient index determiner, wherein the amplitude segmentation threshold set includes K amplitude segmentation thresholds, and the K is an integer greater than or equal to 1. The coefficient index determiner is coupled to the at least one comparator for receiving the determination signal of the amplitude segment, and determining an index of the vector modulation coefficient by looking up the table according to the amplitude segment, and transmitting the index to the selector. The selector receives the index and determines a vector modulation coefficient according to the index and the set of vector modulation coefficients, and outputs a real part and an imaginary part of the vector modulation coefficient, wherein the vector modulation coefficient set includes K vector modulation coefficients.

FIG. 4 is a schematic structural diagram of a coefficient selection module according to an embodiment of the present application. The coefficient selection module includes K comparators, wherein the i-th comparator compares the amplitude of the envelope signal with the magnitude of the threshold β _i of the i-th amplitude segment, and outputs the determination of the i-th amplitude segment according to the comparison result. Signal, where i=1,...,K. Of course, fewer or more comparators can be used to determine the amplitude of the envelope signal. For example, using a comparator, the magnitude of the serial comparison envelope signal is related to the K thresholds, which is not limited in this application. . The coefficient index determiner determines an amplitude segment into which the amplitude of the current envelope signal falls according to the determination signal of the K amplitude segments, and determines an index of the vector modulation coefficient corresponding to the amplitude segment by using a lookup table, that is, a vector to be used. The index of the modulation factor. The selector receives an index of the vector modulation coefficient transmitted by the coefficient index determiner, determines a value of the vector modulation coefficient to be used according to the vector modulation coefficient set {A ₁ , . . . , A _K }, and calculates a real part of the vector modulation coefficient And imaginary output. Wherein, the determination signals of the K amplitude segments may be in different forms. For example, the ith comparator may notify the coefficient index determiner of the amplitude of the current envelope signal and the threshold of the i-th amplitude segment in the form of 0 or 1. The magnitude relationship of β _i , the coefficient index determiner can determine the amplitude segment to which the amplitude of the current envelope signal belongs based on the outputs of the K comparators. Alternatively, the comparator, the coefficient index determiner, and the selector may be implemented in the form of a chip, an integrated circuit, or a discrete device, which is not limited in this application.

Optionally, the coefficient selection module may comprise a storage device for storing the amplitude segmentation threshold set {β ₁ , . . . , β _K } or the vector modulation coefficient set {A ₁ , . . . , A _K } for the comparator or the selector. use. The table required to determine the vector modulation coefficient index based on the amplitude segmentation determination result may also be stored in the above-described memory device for use by the coefficient index determiner. The above memory device may be an integrated memory, or may be separately provided in a comparator, a coefficient index determiner, and a selector. The specific implementation form of the storage device is not limited in this application.

Optionally, the coefficient selection module may also receive other modules through a communication interface or a circuit structure, for example, a predistortion training module (not shown in FIG. 4), and the transmitted amplitude segmentation threshold set {β ₁ , . . . , β _K }, a vector modulation coefficient set {A ₁ , . . . , A _K } or a table required to determine a vector modulation coefficient index based on the amplitude segmentation determination result. The above set or table may be pre-determined according to the characteristics of the system signal, or may be updated in real time according to the characteristic changes of the system signal, so that a better balance between the computational complexity of the system and the system performance can be sought.

After the coefficient selection module determines the vector modulation coefficients A _i need to use the real part of A _i A _{_i's, I,} and the imaginary part A _{i, Q} are output to the multiplication module, A _i by a multiplier _{module, I} and X _I ( t) Multiply, and A _{i, Q} is multiplied by X _Q (t). Optionally, the multiplication module may include at least one multiplier to implement the foregoing functions, and may also implement the foregoing functions by other device forms. In the example given in Figure 3, the multiplication module contains two multipliers, one of which is used to implement the real part A _{i of the} vector modulation factor _{, I} multiplied by the in-phase component signal X _I (t), and the other multiplier The imaginary part A _{i,Q of the} vector modulation coefficient is multiplied by the quadrature component signal X _Q (t). The first addition module adds A _{i, I} and X _I (t) _, and adds two products obtained by multiplying A _{i, Q} and X _Q (t) to obtain a predistortion analog signal Y(t). The predistortion analog signal Y(t) can be used as an input to the power amplifier and is amplified by power and transmitted via the antenna. Optionally, the first adding module may include at least one adder for implementing the above functions, and FIG. 3 shows a form of implementing the above first adding module function by an adder. Combined with the above functions, the predistortion analog signal Y(t) and the analog signal X(t) can be considered to satisfy the following formula:

Where |X(t)| represents the modulo value of the signal X(t).

Optionally, the coefficient selection module can also be implemented in the digital domain, that is, the signal processed by the coefficient selection module is a digital signal. As shown in FIG. 3, the predistortion processing apparatus may further include an analog to digital conversion module and a digital to analog conversion module. The analog-to-digital conversion module is configured to receive the envelope signal of an analog domain output by the envelope detection module, convert an envelope signal of the analog domain into an envelope signal of a digital domain, and output the signal to the coefficient Select the module. The digital-to-analog conversion module is configured to receive a real part and an imaginary part of the vector modulation coefficient of a digital domain output by the coefficient selection module, and convert the real part and the imaginary part of the vector modulation coefficient of the digital domain into The real and imaginary parts of the vector modulation coefficients of the analog domain are output to the multiplication module. Specifically, the envelope detection module outputs an envelope signal |X(t)| ² in an analog form, and converts the analog signal envelope signal |X(t)| ² into an envelope signal in a digital form through an analog-to-digital conversion module | X(n)| ^{2 is} sent to the coefficient selection module, and the coefficient selection module completes the process of selecting the above vector modulation coefficient based on the digital form envelope signal |X(n)| ² , which is different only in the coefficient selection module in this example. The signal is in digital form, and the coefficient selection module outputs the real part A _i,I of the vector modulation coefficient A _i in digital form and the imaginary part A _i,Q , the real part A _i,I and the imaginary part A _i,Q undergo digital-to-analog conversion The module is converted to analog form and input to the multiplication module. Optionally, the analog-to-digital conversion module may include an analog to digital converter (ADC), and the digital-to-analog conversion module may include a digital to analog converter (DAC). The functions and specific implementations of other modules in the predistortion processing apparatus are the same as those described in the above paragraphs, and are not described herein again.

The coefficient selection module is implemented in the digital domain, which can reduce the use of analog devices and improve the accuracy of table lookup, thereby improving the performance of predistortion processing. The coefficient selection module is implemented in the analog domain (ie, the signal processed by the coefficient selection module is an analog signal), which can avoid the use of high-speed ADCs and DACs when the signal bandwidth is large, thereby reducing cost and power consumption.

The predistortion processing apparatus provided by the embodiment of the present application converts an analog signal into an in-phase component signal and a quadrature component signal, and respectively processes the in-phase component signal and the quadrature component signal according to the vector modulation coefficient (ie, a vector modulation operation), thereby The pre-distortion processing of the analog signal is realized, and the two component signals are independent of each other, thereby avoiding direct amplitude modulation and phase modulation processing on the analog signal, thereby avoiding mutual coupling between the amplitude modulation processing and the phase modulation processing, and improving the predistortion effect and the system. performance. At the same time, processing the in-phase component signal and the quadrature component signal according to the vector modulation coefficient can be realized by a multiplier, which reduces the use of the nonlinear device and reduces the cost and power consumption of the system. The vector modulation coefficient is selected by looking up the table according to the amplitude of the signal envelope, which avoids complicated calculation and processing, and is simple to implement, further reduces system complexity and reduces system implementation cost and power consumption.

FIG. 5 is a schematic structural diagram of another predistortion processing apparatus according to an embodiment of the present disclosure. The predistortion processing apparatus shown in FIG. 5 is different from the predistortion processing apparatus shown in FIG. 3 in that the coefficient selection module in the predistortion processing apparatus is further configured to determine DC compensation by looking up the table according to the amplitude of the envelope signal. And outputting, the first adding module in the predistortion processing device is further configured to add the DC compensation amount and the predistortion analog signal to obtain a DC compensated predistortion analog signal. The functions, specific embodiments, and processing procedures of the other modules in the predistortion processing apparatus shown in FIG. 5 are the same as those of the predistortion processing apparatus shown in FIG. 3, and are not described herein again.

In the predistortion processing apparatus shown in FIG. 5, the coefficient selection module is based on the envelope signal |X(t)| ² (when the predistortion processing apparatus includes the analog to digital conversion module, the envelope signal is represented as |X(n) ) ² | For the sake of simplicity, follow the example of |X(t)| ² as an example. Look for the vector modulation factor and DC compensation amount to be used in the pre-generated table. Specifically, the coefficient selection module may determine, according to the envelope signal |X(t)| ^2, an amplitude segment i, i=1, . . . , K at which the envelope signal is located, and a vector modulation coefficient A corresponding to the i-th segment. _{i is} the vector modulation coefficient to be used, and the DC compensation amount B _i corresponding to the i-th segment is used as the DC compensation amount to be used. Where K is the number of amplitude segments, K is an integer greater than or equal to 1, and the thresholds for different amplitude segments are β _i , i=1, . . . , K. In the specific implementation, the amplitude segmentation mode may be adjusted according to system requirements, such as the amplitude characteristics of the input signal, etc., specifically, the values of the adjustment thresholds β _i , i=1, . . . , K, for example, the threshold β _i , i = 1, ..., K can take the value of β _i = (i / K) · β _K , i = 1, ..., K, to achieve uniform segmentation, where β _K is the maximum amplitude value allowed by the system . Optionally, the vector modulation coefficients A _i , i=1, . . . , K are complex numbers, and the real part is used for multiplication with the in-phase component signal, and the imaginary part is used for multiplication with the quadrature component signal, and the DC compensation amount B _i , i=1,...,K is a real number, which is used to add the predistortion analog signal to DC compensation (that is, to obtain a DC compensated predistortion analog signal).

The coefficient selection module may be implemented in the form of a chip, an integrated circuit or a discrete device, or may be implemented by a combination of the above different devices, which is not limited in this application. In one example, the coefficient selection module includes a coefficient index determiner, at least one selector, and at least one comparator. And connecting at least one comparator to the envelope detection module, configured to determine an amplitude segment to which the envelope signal belongs according to the amplitude and amplitude segmentation threshold set of the envelope signal, and send the determination signal of the amplitude segment to the coefficient index The determiner, wherein the amplitude segmentation threshold set includes K amplitude segmentation thresholds, and the K is an integer greater than or equal to 1. The coefficient index determiner is connected to the at least one comparator for receiving the determination signal of the amplitude segment, and determining the index of the vector modulation coefficient and the index of the DC compensation amount according to the amplitude segment, and indexing the vector modulation coefficient And an index of the DC compensation amount is sent to at least one selector. And at least one selector is connected to the coefficient index determiner for receiving an index of the vector modulation coefficient and an index of the DC compensation amount, and determining a vector modulation coefficient according to the index of the vector modulation coefficient and the vector modulation coefficient set, and according to the DC compensation amount The index and the DC compensation amount set determine the DC compensation amount, and output the real part and the imaginary part of the vector modulation coefficient and the DC compensation quantity, wherein the vector modulation coefficient set includes K vector modulation coefficients, and the DC compensation quantity set includes K DC The amount of compensation.

FIG. 6 is a schematic structural diagram of another coefficient selection module according to an embodiment of the present application. The coefficient selection module includes K comparators, wherein the i-th comparator compares the amplitude of the envelope signal with the magnitude of the threshold β _i of the i-th amplitude segment, and outputs the determination of the i-th amplitude segment according to the comparison result. Signal, where i=1,...,K. Of course, you can use fewer or more comparators, or use other methods to determine the amplitude of the envelope signal. For example, use a comparator serial to compare the amplitude of the envelope signal with the K thresholds. The application does not limit this. The coefficient index determiner determines an amplitude segment into which the amplitude of the current envelope signal falls according to the determination signal of the K amplitude segments, and determines an index of the vector modulation coefficient corresponding to the amplitude segment by using a lookup table and the amplitude segment corresponding to the amplitude segment The index of the DC compensation amount, that is, the index of the vector modulation coefficient to be used and the index of the DC compensation amount to be used. At least one selector receives an index of the vector modulation coefficient transmitted by the coefficient index determiner, determines a value of the vector modulation coefficient to be used according to the vector modulation coefficient set {A ₁ , . . . , A _K }, and determines the value of the vector modulation coefficient Real and imaginary output. The at least one selector further receives an index of the DC compensation amount sent by the coefficient index determiner, determines a value of the DC compensation amount to be used according to the DC compensation amount set {B ₁ , . . . , B _K }, and determines the DC compensation amount Output. Specifically, the coefficient selection module shown in FIG. 6 includes two selectors, one of which is used to determine the vector modulation coefficient, and the other is used to determine the DC compensation amount. Of course, the same selector can be multiplexed to determine the vector modulation coefficient and the DC compensation amount, which is not limited in this application. Wherein, the determination signals of the K amplitude segments may be in different forms. For example, the ith comparator may notify the coefficient index determiner of the amplitude of the current envelope signal and the threshold of the i-th amplitude segment in the form of 0 or 1. The magnitude relationship of β _i , the coefficient index determiner can determine the amplitude segment to which the amplitude of the current envelope signal belongs based on the outputs of the K comparators. Alternatively, the comparator, the coefficient index determiner, and the selector may be implemented in the form of a chip, an integrated circuit, or a discrete device, which is not limited in this application.

Optionally, the coefficient selection module may comprise a storage device for storing the amplitude segmentation threshold set {β ₁ , . . . , β _K }, the vector modulation coefficient set {A ₁ , . . . , A _K } or the DC compensation amount set {B ₁ ,...,B _K } for use by comparators or selectors. The table (which may be the same table or a different table) required to determine the vector modulation coefficient index and the DC compensation amount index based on the amplitude segmentation determination result may also be stored in the above storage device for use by the coefficient index determiner. The above memory device may be an integrated memory, or may be separately provided in a comparator, a coefficient index determiner, and a selector. The specific implementation form of the storage device is not limited in this application.

Optionally, the coefficient selection module may also receive other modules through a communication interface or a circuit structure, for example, a predistortion training module (not shown in FIG. 6), and the transmitted amplitude segmentation threshold set {β ₁ , . . . , β _K }, a vector modulation coefficient set {A ₁ , . . . , A _K }, a DC compensation amount set {B ₁ , . . . , B _K } or a table required to determine a vector modulation coefficient index and a DC compensation amount index based on the amplitude segment determination result. . The above set or table may be pre-determined according to the characteristics of the system signal, or may be updated in real time according to the characteristic changes of the system signal, so that a better balance between the computational complexity of the system and the system performance can be sought.

After the coefficient selection module determines the vector modulation coefficients A _i need to use the real part of A _i A _{_i's, I,} and the imaginary part A _{i, Q} are output to the multiplication module, A _i by a multiplier _{module, I} and X _I ( t) Multiply, and A _{i, Q are} multiplied by X _Q (t), wherein the specific function and implementation form of the multiplication module are the same as the example corresponding to FIG. 3. The coefficient selection module determines the DC compensation amount B _i to be used and outputs B _i to the first addition module, the first addition module multiplies A _i,I by X _I (t) and A _i,Q and X _Q (t The two products obtained by multiplication and B _i are accumulated to obtain a DC-compensated predistortion analog signal Y'(t), which can be used as an input of the power amplifier after power amplification. Transmitted via an antenna. Optionally, the first adding module may include at least one adder for implementing the above functions, and FIG. 6 shows a form of implementing the first adding module function by using two adders, that is, first, A _{i, I} and X _I (t) is multiplied and the two products obtained by multiplying A _i,Q and X _Q (t) are added to obtain a predistortion analog signal Y(t), and then Y(t) and B _i are added to obtain a pass. DC compensated predistortion analog signal Y'(t). Combined with the above functions, the predistortion analog signal Y'(t) and the analog signal X(t) can be considered to satisfy the following formula:

Where |X(t)| represents the modulo value of the signal X(t).

Optionally, the coefficient selection module can also be implemented in the digital domain, that is, the signal processed by the coefficient selection module is a digital signal. As shown in FIG. 5, the predistortion processing apparatus may further include an analog to digital conversion module and a digital to analog conversion module. The specific functions and implementations of the analog-to-digital conversion module and the digital-to-analog conversion module are the same as the examples corresponding to FIG. 3, except that in this example, the coefficient selection module is also used to determine the digital compensation amount of the digital form and output, wherein the DC compensation The quantity is also converted into an analog form by a digital to analog conversion module and input to the first addition module.

Due to the non-ideal characteristics of some circuit devices (for example, analog-to-digital converters), DC offset is generated during signal processing to affect system performance, and the amount of DC compensation associated with signal amplitude is increased in the predistortion processing device. The degree of freedom of predistortion processing can further improve the predistortion performance, thereby improving system performance.

FIG. 7 is a schematic structural diagram of still another pre-distortion processing apparatus provided by an embodiment of the present application. The predistortion processing apparatus shown in FIG. 7 adds processing of an envelope signal storage item (ie, a delayed envelope signal) based on the predistortion processing apparatus shown in FIG. 3 or FIG. In the case where the distortion characteristic of the circuit device (for example, a power amplifier) has a memory feature, the signal can be better pre-distorted for the memory feature, thereby improving the performance of the pre-distortion process, and because the coefficient selection in the embodiment of the present application The module looks up the table based on the signal amplitude, resulting in low cost and low power consumption, which can improve system performance with lower cost and power consumption. The memory feature described herein means that the signal characteristics output by the circuit device are not only related to the current input signal, but also affected by the signal input before the current input signal.

As shown in FIG. 7, the coefficient selection module in the predistortion processing apparatus includes a delay module, a second addition module, a first coefficient component selection module, and a second coefficient component selection module. The delay module is connected to the envelope detection module for delaying the envelope signal to obtain a delayed envelope signal. The first coefficient component selecting module determines the first vector modulation coefficient component by looking up the table according to the amplitude of the envelope signal, and outputs a real part and an imaginary part of the first vector modulation coefficient component, and at least one second coefficient component selecting module and the delay module Connected, at least one second vector modulation coefficient component is determined by looking up the table according to the amplitude of the delayed envelope signal, and the real and imaginary parts of the at least one second vector modulation coefficient component are output. The second adding module is connected to the first coefficient component selecting module and the at least one second coefficient component selecting module, and accumulating the real part of the first vector modulation coefficient component and the real part of the at least one second vector modulation coefficient component to obtain a required The real part of the vector modulation coefficient accumulates the imaginary part of the first vector modulation coefficient component and the imaginary part of the at least one second vector modulation coefficient component to obtain the imaginary part of the vector modulation coefficient to be used. Optionally, when the predistortion processing device further performs the processing of the DC compensation amount, the first coefficient component selection module in the coefficient selection module further determines the first DC compensation component by using a lookup table according to the amplitude of the envelope signal. And outputting, at least one second coefficient component selection module in the coefficient selection module, further determining, according to the amplitude of the delayed envelope signal, at least one second DC compensation component component and outputting. The second adding module of the coefficient selection module further accumulates the first DC compensation component and the at least one second DC compensation component to obtain a DC compensation amount to be used.

Optionally, when the coefficient selection module processes the signal in the analog form, the delay module delays the received envelope signal |X(t)| ² in the analog form to obtain the delayed envelope signal |X ( t-Δt)| ² , the first coefficient component selection module performs coefficient selection according to |X(t)| ² , and the second coefficient component selection module performs coefficient selection according to |X(t - Δt)| ² . When the coefficient selection module processes the signal in digital form, the delay module delays the received envelope signal |X(n)| ² in digital form to obtain a delayed envelope signal |X(n-Δn) ² , the first coefficient component selection module performs coefficient selection according to |X(n)| ² , and the second coefficient component selection module performs coefficient selection according to |X(n-Δn)| ² .

Optionally, the first coefficient component selection module and/or the second coefficient component selection module may be implemented in the manner shown in FIG. 4, when the predistortion processing device further performs DC compensation amount processing, the first coefficient component selection module and The second coefficient component selection module can be implemented in the manner shown in FIG. The amplitude segmentation threshold set used by the first coefficient component selection module may be different from the amplitude segmentation threshold set used by the second coefficient component selection module, and the vector modulation coefficient set used by the first coefficient component selection module may be the same The set of vector modulation coefficients used by the two coefficient component selection module is different, and the DC compensation amount set used by the first coefficient component selection module may be different from the DC compensation amount set used by the second coefficient component selection module. Different coefficient component selection modules use different amplitude segmentation threshold combinations, vector modulation coefficient sets or DC compensation quantity sets, which can more flexibly perform predistortion processing according to the characteristics of signals in the system, and further improve predistortion performance.

a second adding module accumulating real parts of the vector modulation coefficient components output by the respective coefficient component selecting modules to obtain real parts of the vector modulation coefficients to be used, and performing imaginary parts of the vector modulation coefficient components output by the respective coefficient component selecting modules The required portion of the vector modulation coefficient to be used is accumulated, and when the predistortion processing device further performs the DC compensation amount processing, the second adding module further accumulates the DC compensation amount components output by the respective coefficient component selecting modules to obtain the DC to be used. The amount of compensation. The second adding module may include at least one adder to implement the above function, and FIG. 7 shows an implementation manner of realizing the real part accumulation of the vector modulation coefficient component and the imaginary part of the vector modulation coefficient component by two adders, respectively. When the predistortion processing device also performs the DC compensation amount processing, the third adder can also be used to realize the accumulation of the flow compensation amount components.

Optionally, the second coefficient component selection module may be used only to determine the second vector modulation coefficient component or the second DC compensation component according to the delayed envelope signal. For the specific implementation, refer to the example in FIG. 7 . The description is not repeated here.

For specific functions and implementations of other modules in the predistortion processing apparatus shown in FIG. 7, reference may be made to the example corresponding to FIG. 3 or FIG. 5.

FIG. 8 is a schematic structural diagram of still another pre-distortion processing apparatus provided by an embodiment of the present application. The predistortion processing apparatus shown in FIG. 8 includes more second coefficient component selection modules based on the predistortion processing apparatus shown in FIG. 7, and the delay module performs different delay processing on the envelope signals. Used by the second coefficient component selection module, the predistortion processing of the signal can be performed for more complex memory characteristics in the system. The amplitude segmentation threshold set used by the plurality of second coefficient component selection modules may be different, and the vector modulation coefficient set used by the plurality of second coefficient component selection modules may be different, and the plurality of second coefficient component selection modules are used by the plurality of second coefficient component selection modules. The set of DC compensation quantities can also be different.

Optionally, in the predistortion processing apparatus shown in FIG. 3 to FIG. 8 above, only the main functional modules are shown, and between the illustrated modules, other signal processing devices or circuits may be included according to system requirements. For example, other software and hardware processing modules may be configured between the various parts and/or devices according to system requirements, which is not limited in this application. The implementation order of the different modules may also be adjusted according to the requirements of the system. For example, the analog-to-digital conversion module may also be disposed before the envelope detection module or after the delay module, etc., which is not limited in this application.

The specific implementation of the device or each module in the embodiment of the present application may be an integrated circuit, a chip, a discrete device, or the like, or any combination thereof, which is not limited in this application. For example, the apparatus or module described in the examples of the present application may be a circuit that may be implemented by a chip system. The chip system may include: a central processing unit (CPU), a general purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), and field programmable. A field programmable gate array (FPGA) or other programmable logic device, transistor logic device, discrete device, hardware component, or any combination of the above. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The apparatus may also be a combination of computing functions, such as one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like. In a specific example, the predistortion processing apparatus provided in the embodiment of the present application may be implemented by a digital chip and/or an analog radio frequency chip, where the digital chip is used to implement the device for processing the digital signal in the above embodiment, and the simulation is performed. The radio frequency chip is used to implement a device for processing an analog signal and/or a radio frequency signal in the above embodiments. Optionally, the analog RF chip may further include an intermediate frequency signal processing chip and a radio frequency signal processing chip.

In Section 901, an in-phase component signal and a quadrature component signal are generated based on the analog signal.

Specifically, the in-phase component signal and the quadrature component signal can be obtained by using orthogonal modulation. The analog signal may be a traffic signal, such as an OFDM symbol carrying service data, or a signal dedicated to pre-distortion processing, which may also be an OFDM symbol.

In section 902, an envelope signal is generated based on the analog signal.

In Section 903, a vector modulation factor is determined by looking up the table based on the magnitude of the envelope signal.

Optionally, the envelope signal may be an envelope signal of an analog domain or an envelope signal of a digital domain.

In a specific example, determining the vector modulation coefficient by looking up the table according to the amplitude of the envelope signal comprises: determining, according to the amplitude and amplitude segmentation threshold set of the envelope signal, an amplitude segment to which the envelope signal belongs And wherein the amplitude segmentation threshold set includes K amplitude segmentation thresholds, and the K is an integer greater than or equal to 1; determining the vector modulation coefficient by using a lookup table according to the amplitude segment to which the envelope signal belongs . Specifically, the index of the vector modulation coefficient may be determined by looking up a table according to the amplitude segment to which the envelope signal belongs, and determining the vector modulation coefficient according to the index and the vector modulation coefficient set, where the vector K vector modulation coefficients are included in the modulation coefficient set.

In another specific example, determining the vector modulation factor by looking up the table based on the magnitude of the envelope signal includes determining a vector modulation factor based on an amplitude of the envelope signal and an amplitude of the delayed envelope signal. Specifically, the first vector modulation coefficient component may be determined by looking up the table according to the amplitude of the envelope signal, and determining at least one second vector modulation coefficient component by using a lookup table according to the amplitude of the delayed envelope signal; A vector modulation coefficient component is added to the at least one second vector modulation coefficient component to obtain the vector modulation coefficient. Wherein the adding the first vector modulation coefficient component to the at least one second vector modulation coefficient component comprises including a real part of the first vector modulation coefficient component and the at least one second vector modulation coefficient component The real parts are summed, and the imaginary part of the first vector modulation coefficient component is added to the imaginary part of the at least one second vector modulation coefficient component. Specifically, the method for determining the first vector modulation coefficient component or the at least one second vector modulation coefficient component may be the same as the process of determining the vector modulation coefficient in the previous paragraph example, and details are not described herein again. The set of amplitude segmentation thresholds used to determine the first vector modulation coefficient component may be different from the amplitude segmentation threshold set used to determine the second vector modulation coefficient component, and the vector modulation coefficient set used by the first vector modulation coefficient component is determined. It may be different from the set of vector modulation coefficients used to determine the second vector modulation factor component. When a plurality of second vector modulation coefficient components need to be determined, the amplitude segmentation threshold set or the vector modulation coefficient set used may be different according to the envelope signals that have undergone different delays.

Optionally, in combination with the foregoing example, the method may further include: receiving at least one of an amplitude segmentation threshold set and a vector modulation coefficient set, and checking by the amplitude of the envelope signal and the at least one set. The table determines the vector modulation coefficient, wherein the amplitude segmentation threshold set includes K amplitude segmentation thresholds, and the vector modulation coefficient set includes K vector modulation coefficients, where K is an integer greater than or equal to .

In 904, multiplying the in-phase component signal by a real part of the vector modulation coefficient to obtain a pre-distorted in-phase component signal, and multiplying the orthogonal component signal by an imaginary part of the vector modulation coefficient to obtain a pre-distortion And a quadrature component signal, the pre-distorted in-phase component signal is added to the pre-distorted quadrature component signal to obtain a pre-distorted analog signal.

The predistortion processing method provided by the embodiment of the present application may further include the following

sections

903a and 904a in combination with the foregoing sections 901-904.

In the portion 903a, the DC compensation amount is determined by looking up the table according to the amplitude of the envelope signal.

In a specific example, determining the DC compensation amount by looking up the table according to the amplitude of the envelope signal comprises: determining, according to the amplitude and amplitude segmentation threshold set of the envelope signal, an amplitude segment to which the envelope signal belongs The amplitude segmentation threshold set includes K amplitude segmentation thresholds, and the K is an integer greater than or equal to 1; according to the amplitude segment to which the envelope signal belongs, the table to be used is determined by using a lookup table. The amount of DC compensation. Specifically, the index of the DC compensation amount may be determined according to the amplitude segment to which the envelope signal belongs, and the DC compensation amount is determined according to the index of the DC compensation amount and the DC compensation amount set, where the DC The compensation amount set includes K DC compensation amounts.

In another specific example, determining the amount of DC compensation by looking up the table according to the amplitude of the envelope signal includes determining a DC compensation amount according to an amplitude of the envelope signal and according to an amplitude of the delayed envelope signal. Specifically, the first DC compensation component may be determined by looking up the table according to the amplitude of the envelope signal; determining at least one second DC compensation component by using a lookup table according to the amplitude of the delayed envelope signal; The first DC compensation amount component and the at least one second DC compensation amount component are accumulated to obtain the DC compensation amount. The method for determining the first DC compensation component or the at least one second DC compensation component may be the same as the process of determining the DC compensation amount in the example in the previous paragraph, and details are not described herein again. Optionally, determining the DC compensation amount set used by the first DC compensation component may be different from determining the DC compensation amount set used by the second DC compensation component. When it is necessary to determine a plurality of second DC compensation component components, the DC compensation component sets may be different according to the envelope signals that have passed different delays.

Optionally, in combination with the foregoing example, the method may further include: receiving a DC compensation amount set, and determining, by using a lookup table, a DC compensation amount according to the amplitude of the envelope signal and the DC compensation amount set, where The DC compensation amount set includes K DC compensation amounts, and the K is an integer greater than or equal to 1.

In the portion 904a, the DC compensation amount is added to the predistortion analog signal to obtain a DC compensated predistortion analog signal.

Optionally, performing steps 901-904 (which may further include

steps

903a and 904a) may be pre-distortion processing devices, for example, the pre-distortion processing devices shown in FIG. 3 to FIG. 8, and may also be systems or communication devices. Other devices in the middle, such as a base station or a medium RF processing device in a user equipment.

Optionally, the execution sequence between the foregoing steps 901-904 (which may also include

steps

903a and 904a) may be adjusted according to system requirements, which is not limited in this application.

It should be noted that the predistortion processing apparatus described in the above embodiments may also be referred to as an analog predistortion processing apparatus. The predistortion processing method described in the above embodiments may be an analog predistortion processing method. The analog signal received and processed in the predistortion processing device or the predistortion processing method may be a radio frequency analog signal (also referred to as a radio frequency signal).

The methods and apparatus described in the present disclosure may be implemented in hardware or in a manner in which a processor executes software instructions. The software instructions may be composed of corresponding software modules, which may be stored in a random access memory (RAM), a flash memory, a read-only memory (ROM), an erasable programmable read only memory. (erasable programmable read-only memory, EPROM), electrically erasable programmable read-only memory (EEPROM), registers, hard disk, mobile hard disk, CD-ROM (compact disc read-only memory, CD) - ROM) or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium. Of course, the storage medium can also be an integral part of the processor. Alternatively, the processor and the storage medium may be located in an ASIC. Alternatively, the ASIC can be located in a communication device. Alternatively, the processor and the storage medium may also reside as discrete components in the communication device.

Those skilled in the art will appreciate that in one or more examples described above, the functions described herein can be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium. Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

The specific embodiments of the present invention have been described in detail with reference to the specific embodiments of the present application. It is to be understood that the foregoing description is only The scope of protection, any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the present application are included in the scope of protection of the present application.

Claims

A predistortion processing apparatus, comprising: a quadrature phase shifting module, an envelope detecting module, a coefficient selecting module, a multiplication module, and a first adding module;

The quadrature phase shifting module is configured to receive an analog signal, and generate an in-phase component signal and a quadrature component signal according to the analog signal;

The envelope detection module is configured to receive the analog signal, and generate an envelope signal according to the analog signal;

The coefficient selection module is connected to the envelope detection module, configured to determine a vector modulation coefficient by looking up a table according to an amplitude of the envelope signal, and output a real part and an imaginary part of the vector modulation coefficient;

The multiplication module is coupled to the quadrature phase shifting module and the coefficient selection module for multiplying the in-phase component signal by a real part of the vector modulation coefficient to obtain a pre-distorted in-phase component signal, and Multiplying the orthogonal component signal by an imaginary part of the vector modulation coefficient to obtain a predistorted quadrature component signal;

The first adding module is connected to the multiplication module, configured to receive the pre-distorted in-phase component signal and the pre-distorted quadrature component signal, and the pre-distorted in-phase component signal and the pre- The distorted orthogonal component signals are added to obtain a predistortion analog signal.
The device of claim 1 wherein:

The coefficient selection module is further configured to determine a DC compensation amount by using a lookup table according to the amplitude of the envelope signal, and output the signal;

The first adding module is further configured to add the DC compensation amount to the predistortion analog signal to obtain a DC compensated predistortion analog signal.
The apparatus according to claim 1 or 2, wherein said coefficient selection module includes a coefficient index determiner, a selector, and at least one comparator;

The at least one comparator is connected to the envelope detection module, configured to determine, according to the amplitude and amplitude segmentation threshold set of the envelope signal, an amplitude segment to which the envelope signal belongs, and the amplitude The segmentation determining signal is sent to the coefficient index determiner, wherein the amplitude segmentation threshold set includes K amplitude segmentation thresholds, and the K is an integer greater than or equal to 1;

The coefficient index determiner is coupled to the at least one comparator for receiving the determination signal of the amplitude segment, and determining an index of the vector modulation coefficient by using a lookup table according to the amplitude segment, and The index is sent to the selector;

The selector is coupled to the coefficient index determiner for receiving the index, and determining the vector modulation coefficient according to the index and the vector modulation coefficient set, and outputting a real part of the vector modulation coefficient An imaginary part, wherein the vector modulation coefficient sets include K vector modulation coefficients.
The apparatus according to claim 2, wherein said coefficient selection module includes a coefficient index determiner, at least one selector, and at least one comparator;

The at least one comparator is connected to the envelope detection module, configured to determine, according to the amplitude and amplitude segmentation threshold set of the envelope signal, an amplitude segment to which the envelope signal belongs, and the amplitude The segmentation determining signal is sent to the coefficient index determiner, wherein the amplitude segmentation threshold set includes K amplitude segmentation thresholds, and the K is an integer greater than or equal to 1;

The coefficient index determiner is coupled to the at least one comparator for receiving the determination signal of the amplitude segment, and determining an index of the vector modulation coefficient by using a lookup table according to the amplitude segment and the An index of the DC compensation amount, and transmitting an index of the vector modulation coefficient and an index of the DC compensation amount to the at least one selector;

The at least one selector is coupled to the coefficient index determiner for receiving an index of the vector modulation coefficient and an index of the DC compensation amount, and according to an index of the vector modulation coefficient and a vector modulation coefficient set Determining the vector modulation coefficient, and determining the DC compensation amount according to the index of the DC compensation amount and the DC compensation amount set, and outputting a real part and an imaginary part of the vector modulation coefficient and the DC compensation amount, wherein The vector modulation coefficient set includes K vector modulation coefficients, and the DC compensation amount set includes K DC compensation amounts.
The apparatus according to claim 1 or 2, wherein the coefficient selection module comprises a delay module, a second addition module, a first coefficient component selection module and at least one second coefficient component selection module;

The delay module is connected to the envelope detection module for delaying the envelope signal to obtain a delayed envelope signal;

The first coefficient component selecting module is configured to determine a first vector modulation coefficient component by using a lookup table according to an amplitude of the envelope signal, and output a real part and an imaginary part of the first vector modulation coefficient component;

The at least one second coefficient component selecting module is connected to the delay module, configured to determine at least one second vector modulation coefficient component by using a lookup table according to the amplitude of the delayed envelope signal, and output the a real part and an imaginary part of at least one second vector modulation coefficient component;

The second adding module is connected to the first coefficient component selecting module and the at least one second coefficient component selecting module, configured to convert a real part of the first vector modulation coefficient component with the at least one Realizing the real part of the vector modulation coefficient component, and accumulating the imaginary part of the first vector modulation coefficient component and the imaginary part of the at least one second vector modulation coefficient component to obtain the The imaginary part of the vector modulation factor.
The apparatus according to claim 2, wherein said coefficient selection module comprises a delay module, a second addition module, a first coefficient component selection module and at least one second coefficient component selection module;

The delay module is connected to the envelope detection module for delaying the envelope signal to obtain a delayed envelope signal;

The first coefficient component selecting module is configured to determine, by using a lookup table, a first vector modulation coefficient component and a first DC compensation component according to an amplitude of the envelope signal, and output the first vector modulation coefficient component a portion and an imaginary part and the first DC compensation amount component;

The at least one second coefficient component selecting module is connected to the delay module, configured to determine at least one second vector modulation coefficient component and at least one second by using a lookup table according to the amplitude of the delayed envelope signal DC compensating for a component, and outputting a real part and an imaginary part of the at least one second vector modulation coefficient component and the at least one second DC compensation amount component;

The second adding module is connected to the first coefficient component selecting module and the at least one second coefficient component selecting module, configured to convert a real part of the first vector modulation coefficient component with the at least one Realizing the real part of the two vector modulation coefficient components to obtain a real part of the vector modulation coefficient, and accumulating the imaginary part of the first vector modulation coefficient component and the imaginary part of the at least one second vector modulation coefficient component to obtain the vector An imaginary part of the modulation factor, and accumulating the first DC compensation amount component and the at least one second DC compensation amount component to obtain the DC compensation amount.
The apparatus according to any one of claims 1 to 6, further comprising: an analog to digital conversion module and a digital to analog conversion module;

The analog-to-digital conversion module is configured to receive the envelope signal of an analog domain output by the envelope detection module, convert an envelope signal of the analog domain into an envelope signal of a digital domain, and output the signal to the coefficient Select module

The digital-to-analog conversion module is configured to receive a real part and an imaginary part of the vector modulation coefficient of a digital domain output by the coefficient selection module, and convert the real part and the imaginary part of the vector modulation coefficient of the digital domain into The real and imaginary parts of the vector modulation coefficients of the analog domain are output to the multiplication module.
The apparatus according to any one of claims 1 to 7, wherein the coefficient selection module is further configured to receive at least one of an amplitude segmentation threshold set and a vector modulation coefficient set, and according to the envelope Determining, by the lookup table, the vector modulation coefficient, the amplitude of the signal and the at least one set, wherein the amplitude segmentation threshold set includes K amplitude segmentation thresholds, and the vector modulation coefficient set includes K vector modulations A coefficient, the K being an integer greater than or equal to one.
The device according to any one of claims 1-8, wherein the coefficient selection module is further configured to receive a DC compensation amount set, and according to the amplitude of the envelope signal and the DC compensation amount set, The DC compensation amount is determined by looking up a table, wherein the DC compensation amount set includes K DC compensation amounts, and the K is an integer greater than or equal to 1.
A communication device, characterized in that the communication device comprises the predistortion processing device according to any one of claims 1-9.
A predistortion processing method, comprising:

Generating an in-phase component signal and a quadrature component signal according to the analog signal;

Generating an envelope signal according to the analog signal;

Determining a vector modulation coefficient by looking up a table according to the amplitude of the envelope signal;

Multiplying the in-phase component signal by a real part of the vector modulation coefficient to obtain a pre-distorted in-phase component signal, multiplying the orthogonal component signal by an imaginary part of the vector modulation coefficient to obtain a predistorted quadrature component And a signal, adding the pre-distorted in-phase component signal and the pre-distorted quadrature component signal to obtain a pre-distortion analog signal.
The method of claim 11 further comprising:

Determining a DC compensation amount by looking up a table according to the amplitude of the envelope signal;

And adding the DC compensation amount to the predistortion analog signal to obtain a DC compensated predistortion analog signal.
The method according to any one of claims 11 or 12, wherein determining the vector modulation coefficient by looking up the table according to the amplitude of the envelope signal comprises:

Determining, according to the amplitude and amplitude segmentation threshold set of the envelope signal, an amplitude segment to which the envelope signal belongs, wherein the amplitude segmentation threshold set includes K amplitude segmentation thresholds, where K is greater than or An integer equal to 1;

Determining the vector modulation coefficient according to the amplitude segment and the vector modulation coefficient set to which the envelope signal belongs, wherein the vector modulation coefficient set includes K vector modulation coefficients.
The method according to claim 11 or 12, wherein the determining the vector modulation coefficient by looking up the table according to the amplitude of the envelope signal comprises: an envelope signal according to the amplitude of the envelope signal and the delay The magnitude of the vector modulation coefficient is determined by looking up the table.
The method according to claim 14, wherein said determining said vector modulation coefficient by looking up a table according to an amplitude of said envelope signal and a magnitude of a delayed envelope signal comprises:

Determining a first vector modulation coefficient component by looking up a table according to an amplitude of the envelope signal;

Determining at least one second vector modulation coefficient component by looking up a table according to the amplitude of the delayed envelope signal;

And adding the first vector modulation coefficient component to the at least one second vector modulation coefficient component to obtain the vector modulation coefficient.
The method of claim 12, wherein the determining the amount of DC compensation by looking up the table according to the amplitude of the envelope signal comprises:

Determining, according to the amplitude and amplitude segmentation threshold set of the envelope signal, an amplitude segment to which the envelope signal belongs, wherein the amplitude segmentation threshold set includes K amplitude segmentation thresholds, where K is greater than or An integer equal to 1;

The DC compensation amount is determined according to the amplitude segment and the DC compensation amount set to which the envelope signal belongs, and the DC compensation amount set includes K DC compensation amounts.
The method according to claim 12, wherein said determining a DC compensation amount by looking up a table according to an amplitude of said envelope signal comprises: determining an amplitude of said envelope signal according to an amplitude of said envelope signal The DC compensation amount is determined by looking up the table.
The method according to claim 17, wherein the determining the DC compensation amount by looking up a table according to the amplitude of the envelope signal and the amplitude of the delayed envelope signal comprises:

Determining, by the lookup table, a first DC compensation amount component according to the amplitude of the envelope signal;

Determining, by the lookup table, at least one second DC compensation amount component according to the amplitude of the delayed envelope signal;

And accumulating the first DC compensation amount component and the at least one second DC compensation amount component to obtain the DC compensation amount.