CN103581082A - Base band pre-distortion coefficient updating device and method, pre-distortion equipment and transmitter - Google Patents
Base band pre-distortion coefficient updating device and method, pre-distortion equipment and transmitter Download PDFInfo
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Abstract
The embodiment of the invention provides a base band pre-distortion coefficient updating device and method, pre-distortion equipment and a transmitter. The base band pre-distortion coefficient updating device comprises a main lobe filter, an envelope detector, an analog-digital converter and a coefficient updater, wherein the main lobe filter is used for filtering feedback signals, filtering out side lobe information of the feedback signals and acquiring main lobe information of the feedback signals; the envelope detector conducts envelope detection on the main lobe information of the feedback signals to acquire an envelop of the main lobe information; the analog-digital converter conducts analog-digital conversion on the envelop of the main lobe information; the coefficient updater updates pre-distortion coefficients of a digital pre-distortion device according to the information subjected to analog-digital conversion. By means of the base band pre-distortion coefficient updating device and method, the pre-distortion equipment and the transmitter, the problem of unbalance between I and Q is avoided, and the complexity and cost of hardware are lowered.
Description
Technical Field
The present invention relates to the field of predistortion, and in particular, to a coefficient updating apparatus and method for baseband predistortion, a predistortion device, and a transmitter.
Background
The predistortion (Pre-distortion) technique is a commonly used Power Amplifier (PA) linearization method, which can effectively compensate amplitude distortion and phase distortion introduced by a Power Amplifier, and its basic principle is to make the Power Amplifier exhibit linear amplification characteristic by a predistortion device opposite to the characteristic of the Power Amplifier.
Fig. 1 is a schematic diagram of a structure of baseband predistortion in the prior art, and as shown in fig. 1, signals in a baseband predistortion system may include an in-phase (I) signal and a Quadrature (Q) signal; the predistortion coefficients may be generated or updated based on the difference of the complete reference signal and the feedback signal.
However, the inventors found that the prior art has the following disadvantages: in the current baseband predistortion system, I, Q two-path signals are used when a predistortion coefficient is updated, and two Analog to Digital converters (ADCs) and a Quadrature Demodulator (QDMOD) are required; not only needs to consider the problem of IQ imbalance, but also has complex hardware and higher cost.
Disclosure of Invention
The embodiment of the invention provides a baseband predistortion coefficient updating device and method, predistortion equipment and a transmitter, aiming at reducing the hardware complexity and the cost.
According to an aspect of the embodiments of the present invention, there is provided a baseband predistortion coefficient updating apparatus, which updates a predistortion coefficient of a digital predistorter; the coefficient updating device includes:
the main lobe filter is used for filtering a feedback signal, filtering out side lobe information of the feedback signal and obtaining main lobe information of the feedback signal;
an envelope detector for performing envelope detection on main lobe information of the feedback signal to obtain an envelope of the main lobe information;
the analog-to-digital converter is used for carrying out analog-to-digital conversion on the envelope of the main lobe information;
and the coefficient updater updates the predistortion coefficient of the digital predistorter according to the information after the analog-to-digital conversion.
According to a further aspect of embodiments of the present invention, there is provided a predistortion apparatus including a digital predistorter and a power amplifier; the predistortion apparatus further comprises:
the main lobe filter is used for filtering a feedback signal, filtering out side lobe information of the feedback signal and obtaining main lobe information of the feedback signal;
an envelope detector for performing envelope detection on main lobe information of the feedback signal to obtain an envelope of the main lobe information;
the analog-to-digital converter is used for carrying out analog-to-digital conversion on the envelope of the main lobe information;
and the coefficient updater updates the predistortion coefficient of the digital predistorter according to the information after the analog-to-digital conversion.
According to another aspect of the embodiments of the present invention, there is provided a method for updating coefficients of baseband predistortion, which updates predistortion coefficients of a digital predistorter; the coefficient updating method comprises the following steps:
filtering a feedback signal, filtering out sidelobe information of the feedback signal and obtaining main lobe information of the feedback signal;
carrying out envelope detection on main lobe information of the feedback signal to obtain an envelope of the main lobe information;
performing analog-to-digital conversion on the envelope of the main lobe information;
and updating the predistortion coefficient of the digital predistorter according to the information after the analog-to-digital conversion.
The invention has the beneficial effects that: by filtering the side lobe information of the feedback signal, the predistortion coefficient is updated by comparing the main lobe information; i, Q two paths of signals are not needed when the predistortion coefficient is updated, and the problem of I, Q unbalance is avoided; and only one analog-to-digital converter is needed, so that the complexity and cost of hardware are reduced.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
FIG. 1 is a diagram of a prior art baseband predistortion architecture;
FIG. 2 is a schematic view showing the configuration of a coefficient updating apparatus according to embodiment 1 of the present invention;
fig. 3 is a schematic diagram showing the configuration of a predistortion apparatus having coefficient updating means according to embodiment 1 of the present invention;
FIG. 4 is a signal diagram before filtering in embodiment 1 of the present invention;
FIG. 5 is a schematic diagram of signals after filtering in embodiment 1 of the present invention;
fig. 6 is a schematic diagram of still another configuration of a predistortion apparatus of embodiment 1 of the present invention;
fig. 7 is a schematic diagram of still another configuration of a predistortion apparatus of embodiment 1 of the present invention;
fig. 8 is a schematic diagram of the configuration of a predistortion apparatus of embodiment 2 of the present invention;
fig. 9 is a flowchart of a coefficient updating method according to embodiment 3 of the present invention.
Detailed Description
The foregoing and other features of the invention will become apparent from the following description taken in conjunction with the accompanying drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the embodiments in which the principles of the invention may be employed, it being understood that the invention is not limited to the embodiments described, but, on the contrary, is intended to cover all modifications, variations, and equivalents falling within the scope of the appended claims.
Example 1
The embodiment of the invention provides a baseband predistortion coefficient updating device, which updates a predistortion coefficient of a digital predistorter.
Fig. 2 is a schematic diagram of a configuration of a coefficient updating apparatus according to an embodiment of the present invention, and as shown in fig. 2, the coefficient updating apparatus 200 includes: a main lobe filter 201, an envelope detector 202, an analog-to-digital converter 203, and a coefficient updater 204;
the main lobe filter 201 filters the feedback signal, filters out side lobe information of the feedback signal, and obtains main lobe information of the feedback signal; the envelope detector 202 performs envelope detection on the main lobe information of the feedback signal to obtain an envelope of the main lobe information; the analog-to-digital converter 203 performs analog-to-digital conversion on the envelope of the main lobe information; the coefficient updater 204 updates the predistortion coefficients of the digital predistorter according to the information after the analog-to-digital conversion.
In this embodiment, the coefficient updating apparatus 200 may be a part of a predistortion device. Fig. 3 is a schematic diagram of a predistortion apparatus with a coefficient update device according to an embodiment of the present invention.
As shown in fig. 3, the predistortion apparatus 300 includes a coefficient updating apparatus 200, and may further include a Digital Predistorter (DPD) 301 and a power amplifier 302. In addition, two Digital-to-Analog converters (DACs) 303, a Quadrature Modulator (QMOD) 304, a Frequency Converter (Frequency Converter) 305, a Coupler (Coupler) 306, a Frequency Converter 307, and the like may be included.
It should be noted that the predistortion apparatus shown in fig. 3 is only a structure shown for convenience of explaining the present invention, but the present invention is not limited thereto, and the structure may be appropriately changed in implementation.
As shown in fig. 3, after passing through the frequency converter 307, the predistorted feedback signal output from the coupler 306 may be filtered by the main lobe filter 201, so that side lobe (sidelobe) information (also referred to as out-of-band information) in the feedback signal is filtered out and main lobe (mainlobe) information (also referred to as in-band information) is retained.
Fig. 4 is a signal diagram before filtering according to an embodiment of the present invention, and as shown in fig. 4, the feedback signal may include main lobe information 401 and side lobe information 402 before being filtered by the main lobe filter 201. Fig. 5 is a signal diagram after filtering according to an embodiment of the present invention, and as shown in fig. 5, after being filtered by the main lobe filter 201, the feedback signal only includes main lobe information 401.
It should be noted that the contents shown in fig. 4 and 5 are only schematic, the present invention is not limited thereto, and the waveform of the signal may have different expressions according to actual situations. In an implementation, the main lobe Filter 201 may employ a Band Pass Filter (BPF). But are not limited to such, and the specific components may be determined according to specific circumstances.
In this embodiment, the envelope detector 202 and the analog-to-digital converter 203 may perform envelope detection (envelope Detect) on the signal from which the side lobe information is filtered and perform analog-to-digital conversion. Reference may be made to the prior art as to how the envelope detection is performed and how the analog-to-digital conversion is performed.
In this embodiment, the predistortion coefficients of the digital predistorter may be updated according to the information after the analog-to-digital conversion. Therefore, I, Q two-path signals are not needed when the predistortion coefficient is updated, and the problem of I, Q unbalance is avoided; and only one analog-to-digital converter is needed, so that compared with the traditional method, one analog-to-digital converter and one quadrature demodulator are reduced, and the complexity and cost of hardware are reduced.
In one embodiment, the coefficient updater 204 may compare the output information of the analog-to-digital converter 203 with a reference signal, and update the predistortion coefficients of the digital predistorter according to the comparison result.
Fig. 6 is a schematic diagram of another configuration of the predistortion apparatus of the embodiment of the present invention. As shown in fig. 6, the coefficient updating apparatus 200 may further include: a reference value generator 601; the reference value generator 601 performs envelope detection on the input signal of the digital predistorter, and generates a reference value for coefficient update. The coefficient updater 204 is specifically configured to compare the information converted by the analog-to-digital converter with a reference value, and update the predistortion coefficient of the digital predistorter according to the comparison result.
In a specific implementation, a synchronization unit (not shown in the figure) may be included to synchronize the output information of the reference value generator 601 and the output information of the analog-to-digital converter 203, and how to implement the method may refer to the prior art.
In particular, reference generator 601 may calculate the magnitude of the I and Q signals, for example
The specific implementation can be determined on a case-by-case basis. As to how to generate the predistortion coefficients specifically, reference may be made to the prior art, and details are not described here.
In another embodiment, the coefficient updater 204 may further process the output information of the analog-to-digital converter 203, and update the predistortion coefficients of the digital predistorter according to the processed information.
Fig. 7 is a schematic diagram of another configuration of the predistortion apparatus of the embodiment of the present invention. As shown in fig. 7, the coefficient updating apparatus 200 may further include: an envelope restorer 701; when the feedback signal is a single-carrier high-order modulation signal, the envelope restorer 701 performs envelope restoration (recovery) on the information output by the analog-to-digital converter; the coefficient updater 204 is specifically configured to update the predistortion coefficients of the digital predistorter according to the information output by the envelope restorer 801. As to how the envelope restoration is specifically performed and how the predistortion coefficients are specifically generated, reference may be made to the prior art.
It is noted that fig. 6 and 7 are only schematic illustrations of how the information output by the analog-to-digital converter is used to update the predistortion coefficients. However, the present invention is not limited thereto, and the specific configuration may be determined according to actual circumstances.
In the invention, the side lobe information in the feedback signal is filtered completely, so that the detection is only needed on the amplitude, thereby realizing the updating of the predistortion coefficient. The following description is made in principle by taking fig. 6 as an example.
As shown in fig. 6, if the points a and c are to be made equal only in magnitude, i.e., | a (t) | ═ c (t) |, a (t) · e can be obtainedjθ(t)C (t), i.e. in the frequency domainWherein A (f), C (f), B (f) are respectively a (t), c (t), ejθ(t)In the frequency domain.
Since the side lobe information in the feedback signal is filtered to be clean, i.e. a (f), c (f) has no side lobe information, b (f) ═ k δ (f) can be deduced; where δ (f) is a dirac function and k is a complex factor. Thus in the time domain ejθ(t)＝ejθI.e. a (t) ejθThe phase difference between the signals at points a and c is independent of time t.
The above description is from a continuous domain, and the same conclusions can be drawn from a discrete domain. For example, the following schematic description will be given by taking 6 sampling points as an example. If one wants to make points a and c equal only in magnitude, i.e. | ai|＝|ciI, can be derived
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As can be known from the derivation process, after the side lobe information in the feedback signal is filtered, the amplitudes of the feedback signal and the reference signal are required to be equal, and the following can be derived from both the continuous domain and the discrete domain: the feedback signal and the reference signal only have phase difference without time variation, and the linear characteristic of the predistortion system is not influenced.
It is noted that the above merely illustrates the invention in principle. In addition, the feasibility of the invention is also proved from simulation or experimental results in practical implementation.
It can be known from the above embodiments that the update of the predistortion coefficient is performed by filtering the side lobe information of the feedback signal and comparing the main lobe information; i, Q two paths of signals are not needed when the predistortion coefficient is updated, and the problem of I, Q unbalance is avoided; and only one analog-to-digital converter is needed, so that the complexity and cost of hardware are reduced.
Example 2
An embodiment of the present invention provides a predistortion apparatus, and fig. 8 is a schematic configuration diagram of the predistortion apparatus according to the embodiment of the present invention. As shown in fig. 8, the predistortion apparatus 800 includes a digital predistorter 801 and a power amplifier 802. Other parts of the predistortion device 800 may be referred to in the art and are not shown in the figure.
As shown in fig. 8, the predistortion apparatus may further include:
a main lobe filter 803 for filtering the feedback signal, filtering out side lobe information of the feedback signal, and obtaining main lobe information of the feedback signal;
an envelope detector 804, which performs envelope detection on the main lobe information of the feedback signal to obtain an envelope of the main lobe information;
an analog-to-digital converter 805 that performs analog-to-digital conversion on the envelope of the main lobe information;
the coefficient updater 806 updates the predistortion coefficient of the digital predistorter 901 according to the information after the analog-to-digital conversion.
In one embodiment, the predistortion apparatus 800 may further comprise: and a reference value generator (not shown) for performing envelope detection on the input signal of the digital predistorter and generating a reference value for coefficient updating. The coefficient updater 806 is specifically configured to compare the information converted by the analog-to-digital converter 805 with the reference value, and update the predistortion coefficient of the digital predistorter 801 according to the comparison result.
In another embodiment, the predistortion apparatus 800 may further comprise: and an envelope restorer (not shown in the figure) for performing envelope restoration on the information output by the analog-to-digital converter 805 when the feedback signal is a single carrier high-order modulation signal. The coefficient updater 806 is specifically configured to update the predistortion coefficients of the digital predistorter 801 according to the information output by the envelope restorer.
The embodiment of the invention also provides a transmitter, which comprises a digital predistorter and a power amplifier; the transmitter further includes a coefficient updating apparatus as described in embodiment 1.
It can be known from the above embodiments that the update of the predistortion coefficient is performed by filtering the side lobe information of the feedback signal and comparing the main lobe information; i, Q two paths of signals are not needed when the predistortion coefficient is updated, and the problem of I, Q unbalance is avoided; and only one analog-to-digital converter is needed, so that the complexity and cost of hardware are reduced.
Example 3
The embodiment of the invention provides a method for updating a coefficient of baseband predistortion, which is used for updating a predistortion coefficient of a digital predistorter. The same portions as those in embodiment 1 will not be described again.
Fig. 9 is a flowchart of a coefficient updating method according to an embodiment of the present invention, and as shown in fig. 9, the coefficient updating method includes:
In one embodiment, the coefficient updating method may further include: envelope detection is performed on an input signal of the digital predistorter, and a reference value for coefficient updating is generated. Further, step 1004 specifically includes: and comparing the information after the analog-to-digital conversion with the reference value, and updating the predistortion coefficient of the digital predistorter according to the comparison result.
In another embodiment, the coefficient updating method may further include: and when the feedback signal is a single-carrier high-order modulation signal, carrying out envelope recovery on the information after the analog-to-digital conversion. Further, step 1004 specifically includes: and updating the predistortion coefficient of the digital predistorter according to the information after the envelope recovery.
It can be known from the above embodiments that the update of the predistortion coefficient is performed by filtering the side lobe information of the feedback signal and comparing the main lobe information; i, Q two paths of signals are not needed when the predistortion coefficient is updated, and the problem of I, Q unbalance is avoided; and only one analog-to-digital converter is needed, so that the complexity and cost of hardware are reduced.
The above devices and methods of the present invention can be implemented by hardware, or can be implemented by hardware and software. The present invention relates to a computer-readable program which, when executed by a logic section, enables the logic section to realize the above-described apparatus or constituent section, or to realize the above-described various methods or steps. The present invention also relates to a storage medium such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like, for storing the above program.
While the invention has been described with reference to specific embodiments, it will be apparent to those skilled in the art that these descriptions are illustrative and not intended to limit the scope of the invention. Various modifications and alterations of this invention will become apparent to those skilled in the art based upon the spirit and principles of this invention, and such modifications and alterations are also within the scope of this invention.
With respect to the embodiments including the above embodiments, the following remarks are also disclosed:
(supplementary note 1) a baseband predistortion coefficient updating apparatus that updates a predistortion coefficient of a digital predistorter; the coefficient updating device includes:
the main lobe filter is used for filtering a feedback signal, filtering out side lobe information of the feedback signal and obtaining main lobe information of the feedback signal;
an envelope detector for performing envelope detection on main lobe information of the feedback signal to obtain an envelope of the main lobe information;
the analog-to-digital converter is used for carrying out analog-to-digital conversion on the envelope of the main lobe information;
and the coefficient updater updates the predistortion coefficient of the digital predistorter according to the information after the analog-to-digital conversion.
(supplementary note 2) the coefficient updating apparatus according to supplementary note 1, wherein the coefficient updating apparatus further comprises:
a reference value generator for performing envelope detection on an input signal of the digital predistorter and generating a reference value for coefficient updating;
the coefficient updater is specifically configured to compare the information converted by the analog-to-digital converter with the reference value, and update the predistortion coefficient of the digital predistorter according to a comparison result.
(supplementary note 3) the coefficient updating apparatus according to supplementary note 1, wherein the coefficient updating apparatus further comprises:
the envelope restorer is used for carrying out envelope restoration on the information output by the analog-to-digital converter when the feedback signal is a single-carrier high-order modulation signal;
and the coefficient updater is specifically configured to update the predistortion coefficient of the digital predistorter according to the information output by the envelope restorer.
(supplementary note 4) a predistortion apparatus comprising a digital predistorter and a power amplifier; the predistortion apparatus further comprises:
the main lobe filter is used for filtering a feedback signal, filtering out side lobe information of the feedback signal and obtaining main lobe information of the feedback signal;
an envelope detector for performing envelope detection on main lobe information of the feedback signal to obtain an envelope of the main lobe information;
the analog-to-digital converter is used for carrying out analog-to-digital conversion on the envelope of the main lobe information;
and the coefficient updater updates the predistortion coefficient of the digital predistorter according to the information after the analog-to-digital conversion.
(additional note 5) the predistortion apparatus according to additional note 4, wherein the predistortion apparatus further comprises:
a reference value generator for performing envelope detection on an input signal of the digital predistorter and generating a reference value for coefficient updating;
the coefficient updater is specifically configured to compare the information converted by the analog-to-digital converter with the reference value, and update the predistortion coefficient of the digital predistorter according to a comparison result.
(supplementary note 6) the predistortion apparatus according to supplementary note 4, wherein the predistortion apparatus further comprises:
the envelope restorer is used for carrying out envelope restoration on the information output by the analog-to-digital converter when the feedback signal is a single-carrier high-order modulation signal;
and the coefficient updater is specifically configured to update the predistortion coefficient of the digital predistorter according to the information output by the envelope restorer.
(supplementary note 7) a transmitter including a digital predistorter and a power amplifier; the transmitter further includes:
the main lobe filter is used for filtering a feedback signal, filtering out side lobe information of the feedback signal and obtaining main lobe information of the feedback signal;
an envelope detector for performing envelope detection on main lobe information of the feedback signal to obtain an envelope of the main lobe information;
the analog-to-digital converter is used for carrying out analog-to-digital conversion on the envelope of the main lobe information;
and the coefficient updater updates the predistortion coefficient of the digital predistorter according to the information after the analog-to-digital conversion.
(supplementary note 8) the transmitter according to supplementary note 7, wherein the transmitter further comprises:
a reference value generator for performing envelope detection on an input signal of the digital predistorter and generating a reference value for coefficient updating;
the coefficient updater is specifically configured to compare the information converted by the analog-to-digital converter with the reference value, and update the predistortion coefficient of the digital predistorter according to a comparison result.
(supplementary note 9) the transmitter according to supplementary note 7, wherein the transmitter further comprises:
the envelope restorer is used for carrying out envelope restoration on the information output by the analog-to-digital converter when the feedback signal is a single-carrier high-order modulation signal;
and the coefficient updater is specifically configured to update the predistortion coefficient of the digital predistorter according to the information output by the envelope restorer.
(supplementary note 10), a baseband predistortion coefficient updating method, update the predistortion coefficient of the digital predistorter; the coefficient updating method comprises the following steps:
filtering a feedback signal, filtering out sidelobe information of the feedback signal and obtaining main lobe information of the feedback signal;
carrying out envelope detection on main lobe information of the feedback signal to obtain an envelope of the main lobe information;
performing analog-to-digital conversion on the envelope of the main lobe information;
and updating the predistortion coefficient of the digital predistorter according to the information after the analog-to-digital conversion.
(supplementary note 11) the coefficient updating method according to supplementary note 10, wherein the coefficient updating method further comprises:
carrying out envelope detection on an input signal of the digital predistorter to generate a reference value for coefficient updating;
and, updating the predistortion coefficient of the digital predistorter according to the information after the analog-to-digital conversion specifically comprises: and comparing the information after the analog-to-digital conversion with the reference value, and updating the predistortion coefficient of the digital predistorter according to the comparison result.
(supplementary note 12) the coefficient updating method according to supplementary note 10, wherein the coefficient updating method further comprises:
when the feedback signal is a single-carrier high-order modulation signal, carrying out envelope restoration on the information after the analog-to-digital conversion;
and, updating the predistortion coefficient of the digital predistorter according to the information after the analog-to-digital conversion specifically comprises: and updating the predistortion coefficient of the digital predistorter according to the information after envelope restoration.
Claims (10)
1. A kind of baseband predistortion coefficient updating device, upgrade the predistortion coefficient of the digital predistorter; the coefficient updating device includes:
the main lobe filter is used for filtering a feedback signal, filtering out side lobe information of the feedback signal and obtaining main lobe information of the feedback signal;
an envelope detector for performing envelope detection on main lobe information of the feedback signal to obtain an envelope of the main lobe information;
the analog-to-digital converter is used for carrying out analog-to-digital conversion on the envelope of the main lobe information;
and the coefficient updater updates the predistortion coefficient of the digital predistorter according to the information after the analog-to-digital conversion.
2. The coefficient updating apparatus according to claim 1, wherein the coefficient updating apparatus further comprises:
a reference value generator for performing envelope detection on an input signal of the digital predistorter and generating a reference value for coefficient updating;
the coefficient updater is specifically configured to compare the information converted by the analog-to-digital converter with the reference value, and update the predistortion coefficient of the digital predistorter according to a comparison result.
3. The coefficient updating apparatus according to claim 1, wherein the coefficient updating apparatus further comprises:
the envelope restorer is used for carrying out envelope restoration on the information output by the analog-to-digital converter when the feedback signal is a single-carrier high-order modulation signal;
and the coefficient updater is specifically configured to update the predistortion coefficient of the digital predistorter according to the information output by the envelope restorer.
4. A predistortion apparatus comprising a digital predistorter and a power amplifier; the predistortion apparatus further comprises:
the main lobe filter is used for filtering a feedback signal, filtering out side lobe information of the feedback signal and obtaining main lobe information of the feedback signal;
an envelope detector for performing envelope detection on main lobe information of the feedback signal to obtain an envelope of the main lobe information;
the analog-to-digital converter is used for carrying out analog-to-digital conversion on the envelope of the main lobe information;
and the coefficient updater updates the predistortion coefficient of the digital predistorter according to the information after the analog-to-digital conversion.
5. The predistortion apparatus of claim 4, wherein the predistortion apparatus further comprises:
a reference value generator for performing envelope detection on an input signal of the digital predistorter and generating a reference value for coefficient updating;
the coefficient updater is specifically configured to compare the information converted by the analog-to-digital converter with the reference value, and update the predistortion coefficient of the digital predistorter according to a comparison result.
6. The predistortion apparatus of claim 4, wherein the predistortion apparatus further comprises:
the envelope restorer is used for carrying out envelope restoration on the information output by the analog-to-digital converter when the feedback signal is a single-carrier high-order modulation signal;
and the coefficient updater is specifically configured to update the predistortion coefficient of the digital predistorter according to the information output by the envelope restorer.
7. A transmitter comprising a digital predistorter and a power amplifier; the transmitter further comprises a coefficient updating apparatus as claimed in any one of claims 1 to 3.
8. A coefficient updating method of baseband predistortion updates the predistortion coefficient of a digital predistorter; the coefficient updating method comprises the following steps:
filtering a feedback signal, filtering out sidelobe information of the feedback signal and obtaining main lobe information of the feedback signal;
carrying out envelope detection on main lobe information of the feedback signal to obtain an envelope of the main lobe information;
performing analog-to-digital conversion on the envelope of the main lobe information;
and updating the predistortion coefficient of the digital predistorter according to the information after the analog-to-digital conversion.
9. The coefficient updating method according to claim 8, wherein the coefficient updating method further comprises:
carrying out envelope detection on an input signal of the digital predistorter to generate a reference value for coefficient updating;
and, updating the predistortion coefficient of the digital predistorter according to the information after the analog-to-digital conversion specifically comprises: and comparing the information after the analog-to-digital conversion with the reference value, and updating the predistortion coefficient of the digital predistorter according to the comparison result.
10. The coefficient updating method according to claim 8, wherein the coefficient updating method further comprises:
when the feedback signal is a single-carrier high-order modulation signal, carrying out envelope restoration on the information after the analog-to-digital conversion;
and, updating the predistortion coefficient of the digital predistorter according to the information after the analog-to-digital conversion specifically comprises: and updating the predistortion coefficient of the digital predistorter according to the information after envelope restoration.
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