WO2013177875A1

WO2013177875A1 - Power amplifier and control method thereof

Info

Publication number: WO2013177875A1
Application number: PCT/CN2012/081912
Authority: WO
Inventors: 张舜卿; 徐树公
Original assignee: 华为技术有限公司
Priority date: 2012-05-31
Filing date: 2012-09-25
Publication date: 2013-12-05
Also published as: CN103457557B; CN103457557A

Abstract

Embodiments of the present invention relate to the field of electronics and provide a power amplifier and a control method thereof, so as to reduce overall power consumption of the power amplifier. The power amplifier comprises: according to the current number of carriers, obtaining an update threshold corresponding to the current number of carriers from preset thresholds, the number of the preset thresholds being at least two; comparing a preset parameter value of an intermodulation signal with the update threshold, and controlling on and off of an intermodulation compensation circuit according to a comparison result. The power amplifier and the control method thereof provided by the embodiments of the present invention are applied to use of a power amplifier.

Description

The present invention claims priority to Chinese Patent Application entitled "A Power Amplifier and Its Control Method" by the Chinese Patent Office, Application No. 201210176852.7, filed on May 31, 2012, The entire contents of this application are incorporated herein by reference. Technical field

The present invention relates to the field of electronics, and in particular, to a power amplifier and a control method thereof. Background technique

Power amplifiers, referred to as power amplifiers, are an important part of base stations in wireless communication systems. As an effective means to improve base station capacity and reduce base station energy consumption, multi-carrier power amplifiers are being widely adopted by many equipment manufacturers. There are two main types of multi-carrier power amplifiers: one is called feedforward power amplifier, and the other is called Doherty-DPD (Doherty Digital Pre-DistortiON). In a feedforward power amplifier, an intermodulation compensation circuit is usually included to compensate for the intermodulation distortion caused by amplifying a multi-channel RF (Radio Frequency) signal. Since the intermodulation compensation circuit contains high-power devices such as gain control and error power amplifier, the energy consumption level is high, so the overall power consumption of the power amplifier is high.

Summary of the invention

Embodiments of the present invention provide a power amplifier and a control method thereof that can reduce the overall power consumption of a power amplifier.

In order to achieve the above objectives, embodiments of the present invention adopt the following technical solutions:

In one aspect, a power amplifier control method is provided, including:

Acquiring an update threshold corresponding to the current number of carriers in a preset threshold according to the number of the current carriers, where the preset threshold is at least two;

The preset parameter value of the intermodulation signal is compared with the update threshold, and the intermodulation compensation circuit is turned on and off according to the comparison result.

In one aspect, a power amplifier is provided, including:

An update unit, configured to acquire and locate a preset threshold according to the current number of carriers The update threshold corresponding to the current number of carriers, the preset threshold is at least two; the first control unit is configured to compare the preset parameter value of the intermodulation signal with the update threshold, and control the intermodulation compensation according to the comparison result. The circuit is turned on and off.

An embodiment of the present invention provides a power amplifier and a control method thereof, where the power amplifier includes: an update threshold corresponding to the current number of carriers is obtained in a preset threshold according to the number of current carriers, where the preset threshold has at least And comparing the preset parameter value of the intermodulation signal with the update threshold, and controlling the opening and closing of the intermodulation compensation circuit according to the comparison result. In this way, the update threshold in the power amplifier can be dynamically adjusted according to the current number of carriers, and the intermodulation compensation circuit is controlled by comparing the preset parameter value of the intermodulation signal with the update threshold, thereby achieving intermodulation. The dynamic matching of the compensation circuit to different carrier numbers and intermodulation signals reduces the power consumption of the intermodulation compensation circuit, thus reducing the overall power consumption of the power amplifier.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

FIG. 1 is a flowchart of a power amplifier control method according to an embodiment of the present invention; FIG. 2 is a flow chart of another power amplifier control method according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a protection period according to an embodiment of the present invention; FIG.

FIG. 4 is a schematic structural diagram of a power amplifier according to an embodiment of the present invention; FIG. 5 is a schematic structural diagram of another power amplifier according to an embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all others obtained by those of ordinary skill in the art without creative efforts The embodiments are all within the scope of protection of the present invention.

Embodiments of the present invention provide a power amplifier control method, as shown in FIG. 1, including:

5101. Acquire an update threshold corresponding to the current number of carriers in the preset threshold according to the number of the current carriers, where the preset threshold is at least two.

5 102. Compare the preset parameter value of the intermodulation signal with the update threshold, and control the opening and closing of the intermodulation compensation circuit according to the comparison result.

In this way, the update threshold in the power amplifier can be dynamically adjusted according to the current number of carriers, and the intermodulation compensation circuit is controlled by comparing the preset parameter value of the intermodulation signal with the update threshold, thereby achieving intermodulation. The dynamic matching of the compensation circuit to different carrier numbers and intermodulation signals reduces the power consumption of the intermodulation compensation circuit, thus reducing the overall power consumption of the power amplifier.

It should be noted that the preset parameter values of the intermodulation signal may be multiple. For example, the preset parameter value may be an energy value of an intermodulation signal, or may be an intermodulation signal quality, and the intermodulation signal quality is The reciprocal of the energy value of the intermodulation signal, the preset parameter value for different intermodulation signals, the selection of the update threshold, and the comparison of the preset parameter value and the update threshold may be appropriately adjusted.

For example, when there are two preset thresholds, which are a first threshold and a second threshold, and the first threshold is greater than the second threshold, step S101 may include: if the number of current carriers is equal to 1 And selecting a second threshold as the update threshold; if the number of the current carriers is greater than 1, selecting the first threshold as the update threshold. When the preset parameter value of the intermodulation signal is the intermodulation signal quality, step S102 may include: turning on the intermodulation compensation circuit when the intermodulation signal quality is less than the update threshold; and when the intermodulation signal quality is greater than or equal to the update The threshold turns off the intermodulation compensation circuit. The intermodulation signal quality can also be regarded as a reflection of the energy value of the intermodulation signal. The larger the value of the intermodulation signal quality, the smaller the energy value of the intermodulation signal, and the better the signal quality of the intermodulation signal. In the embodiment of the invention, the better the signal quality of the intermodulation signal, the easier the above-mentioned intermodulation compensation circuit is turned off, thereby achieving the purpose of dynamic energy saving. Further, if the current number of carriers is equal to 1, the update threshold is a second threshold, and the second threshold is lower, and the update threshold is the first. At the threshold value, the closing probability of the intermodulation compensation circuit is relatively increased, and the effect of energy saving is more obvious. It should be noted that during the use of the power amplifier, there may be a test process of the power amplifier, which may also be referred to as a training process, which may be a stage of the adaptive process of the power amplifier, the self-test process or the modeling process. For example, when the fuzzy neural network is used to model the power amplifier, the fuzzy neural network modeling process can be divided into two steps: the establishment of the initial model and the subsequent training adjustment of the model, that is, the testing process. The testing process of the fuzzy neural network modeling process may first input the test signal, and then detect the output signal and other related signals, so as to adjust the corresponding parameters, and gradually reduce the error between the fuzzy output value of the system and the actual output value.

For example, when the power amplifier has a test process and the preset parameter value of the intermodulation signal is the value of the intermodulation signal, the power amplifier control method provided by the embodiment of the present invention, as shown in FIG. 2, specifically includes:

S20: Obtain an update threshold corresponding to the current number of carriers in a preset threshold according to the number of current carriers. Go to step S202.

For multi-carrier power amplifiers, the intermodulation distortion mainly includes the secondary intermodulation signal and the cubic intermodulation signal of the multi-tone signal. Wherein, the component of the second intermodulation signal is far from the frequency band of the fundamental frequency signal, and can usually be filtered by filtering, but the three intermodulation signals are close to the frequency band of the original fundamental frequency signal, so an intermodulation compensation circuit is needed. Eliminate. For a single-carrier power amplifier, since there is no inter-carrier intermodulation signal, the intermodulation compensation circuit often has no obvious effect. Therefore, when the carrier of the power amplifier is a single carrier, the intermodulation compensation circuit can be turned off.

For example, if the number of the current carriers is equal to 1, that is, the current carrier is a single carrier, the second threshold m may be selected as the update threshold; if the current number of carriers is greater than 1, the current carrier is When multi-carrier, the first threshold n is selected as the update threshold, where m<n.

5202. Determine whether the quality of the intermodulation signal is greater than or equal to an update threshold. When the intermodulation signal quality is greater than or equal to the update threshold, step S203 is performed, and when the intermodulation signal quality is less than the update threshold, step S204 is performed.

5203. Detect whether the power amplifier is in a protection period. If the power amplifier is insured In the protection period, step S204 is performed. If the power amplifier is not in the protection period, step S205 is performed. For example, if the power amplifier triggers the test period, the intermodulation compensation circuit can be turned on in a preset period, where the preset period is greater than or equal to the test period. The power amplifier can check whether there is a test signal. When there is a test signal, it indicates that the corresponding test cycle is triggered. Usually, the test cycle is the test signal duration, and the power amplifier in the test process needs the intermodulation compensation circuit to be turned on to protect the test. Normally, but because the period of different test signals is different, when the intermodulation signal quality is greater than or equal to the update threshold, it is necessary to keep at least the duration of the intermodulation compensation circuit being turned on equal to the corresponding test period. For a power amplifier, there are usually a variety of test signals, so the longest period of each test cycle can be selected as the preset period. For example, if the test period of a power amplifier is 2ms, 5 ms ... 3 Ms, etc., where 5ms is the longest period, you can select 5 ms as the preset period.

It should be noted that some of the test signals of the power amplifier are periodic inputs, such as self-test signals, and some test signals are non-periodic inputs, such as temporary test signals. Therefore, a test signal is input in a test period of another test signal, and triggers of different overlapping periods are generated, so that corresponding preset periods also overlap. In the embodiment of the present invention, a separate preset period may be called. For the protection period, the overlapping preset period can also be called the protection period. For example, the time axis shown in Figure 3 is established. ^^ The preset period is 5 ms. If the test signal X is input at 0ms, the test is performed. The period is 4ms, the test signal y is input at 3 ms, and the test period is 3 ms. For the test signal X, the intermodulation compensation circuit should be turned on from 0ms to 5ms. For the test signal y, the intermodulation compensation circuit should be in the 3ms to 8ms. On, the preset period of the test signal x, y has an overlapping period, and the period A, that is, 0ms to 8ms can be used as the protection period to ensure that each test period can be performed normally.

Specifically, when the intermodulation signal quality is greater than or equal to the update threshold, the delay module in the control module of the control intermodulation compensation circuit may be turned on to enable the intermodulation compensation circuit to be turned on during the protection period, and the delay module may be a The delay protection circuit may also be a delay device, which is not limited by the present invention.

S204. Turn on the intermodulation compensation circuit. When the intermodulation signal quality is less than the update threshold, the intermodulation compensation circuit is directly turned on. If the power amplifier is in the protection period, the intermodulation compensation circuit is turned on during the protection period, and the intermodulation compensation circuit is turned off after the protection period ends.

S205. Turn off the intermodulation compensation circuit.

It should be noted that, in practical applications, the intermodulation compensation circuit may include: an inverting adder, an attenuator, a gain controller, and the like. In the embodiment of the present invention, the off-intermodulation compensation circuit refers to turning off the intermodulation. Gain controller, phase controller and error amplifier in the compensation circuit.

It should be noted that the sequence of steps of the power amplifier control method provided by the embodiment of the present invention may be appropriately adjusted, and the number of steps may also be increased or decreased according to the situation, and any technology familiar to those skilled in the art may disclose the present invention. Within the scope, the method of change can be easily thought of, so it will not be described again.

In the power amplifier control method provided by the embodiment of the present invention, the update threshold in the power amplifier may be dynamically adjusted according to the transformation of the current number of carriers, and the intermodulation is performed by comparing the preset parameter value of the intermodulation signal with the update threshold. The control of the compensation circuit realizes the dynamic matching of the intermodulation compensation circuit for different carrier numbers and intermodulation signals, and reduces the power consumption of the intermodulation compensation circuit, thereby reducing the overall power consumption of the power amplifier. The embodiment of the present invention provides a power amplifier 40, as shown in FIG. 4, including: an updating unit 402, configured to acquire, according to the number of current carriers, an update threshold corresponding to the current number of carriers in a preset threshold, There are at least two preset thresholds.

The first control unit 403 is configured to compare the preset parameter value of the intermodulation signal with the update threshold, and control the opening and closing of the intermodulation compensation circuit according to the comparison result.

As shown by the dashed box in FIG. 4, the modified power amplifier 40 may further include: an intermodulation compensation circuit 401 for compensating for intermodulation distortion caused by the amplified radio frequency signal. It should be noted that, in practical applications, the intermodulation compensation circuit may include: an inverting adder, an attenuator, a gain controller, and the like. In the embodiment of the present invention, the off-intermodulation compensation circuit refers to turning off the intermodulation. Gain controller, phase controller and error amplifier in the compensation circuit. In this way, the updating unit enables the update threshold in the power amplifier to be dynamically adjusted according to the transformation of the current number of carriers, and the first control unit performs the intermodulation compensation circuit by comparing the preset parameter value of the intermodulation signal with the update threshold. The control realizes the dynamic matching of the intermodulation compensation circuit for different carrier numbers and intermodulation signals, and reduces the power consumption of the intermodulation compensation circuit, thereby reducing the overall power consumption of the power amplifier.

Further, when there are two preset thresholds, which are respectively a first threshold and a second threshold, and the first threshold is greater than the second threshold, the updating unit 402 is specifically configured to:

And if the number of the current carriers is equal to 1, the second threshold is selected as the update threshold; if the number of the current carriers is greater than 1, the first threshold is selected as the update threshold.

When the preset parameter value of the intermodulation signal is the intermodulation signal quality, the first control unit 403 is specifically configured to: when the intermodulation signal is greater than or equal to the update threshold, turn off the intermodulation compensation circuit; When the modulation signal is smaller than the update threshold, the intermodulation compensation circuit is turned on, and the intermodulation signal quality is a reciprocal of the energy value of the intermodulation signal.

In particular, as shown in FIG. 5, when the preset parameter value of the intermodulation signal is the value of the intermodulation signal, the power amplifier 40 may further include: a second control unit 404, configured to: when the intermodulation signal is greater than or equal to the When the threshold is updated, detecting whether the power amplifier triggers a test period, where the intermodulation signal quality is a reciprocal of the energy value of the intermodulation signal; if the power amplifier triggers the test period, the intermodulation compensation is caused The circuit is turned on in a preset period, and the preset period is greater than or equal to the test period. For example, the second control unit 404 may be a delay module to enable the intermodulation compensation circuit to be turned on within a preset period. The delay module may be a delay protection circuit or a delay device. No restrictions.

In particular, the specific working steps of the respective units in the power amplifier provided in the embodiments of the present invention may be referred to the corresponding steps in the power amplifier control method provided by the embodiment of the present invention, and will not be described in detail herein.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the device implementation described above The example is only illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner. For example, multiple units or components may be combined or integrated into another system, or Some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as the units may or may not be physical units, and may be located in one place or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiment of the present embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may be physically included separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

The above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The software functional unit described above is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform portions of the steps of the various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a disk or an optical disk, and the like, which can store program codes. The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present invention. All should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

claims

1. A power amplifier control method, characterized by including:

According to the number of current carriers, obtain an update threshold corresponding to the number of current carriers in a preset threshold, where there are at least two preset thresholds;

Compare the preset parameter value of the intermodulation signal with the update threshold, and control the opening and closing of the intermodulation compensation circuit according to the comparison result.

2. The method according to claim 1, characterized in that when there are two preset thresholds, namely a first threshold and a second threshold, and the first threshold is greater than the second threshold,

According to the number of current carriers, obtaining an update threshold corresponding to the number of current carriers in a preset threshold includes:

If the number of current carriers is equal to 1, select the second threshold as the update threshold;

If the number of current carriers is greater than 1, select the first threshold as the update threshold.

3. The method according to claim 2, characterized in that, when the preset parameter value of the intermodulation signal is the intermodulation signal quality, the preset parameter value of the intermodulation signal is compared with the update threshold. Compare and control the turning on and off of the intermodulation compensation circuit based on the comparison results including:

When the intermodulation signal quality is less than the update threshold, the intermodulation compensation circuit is turned on, and the intermodulation signal quality is the reciprocal of the energy value of the intermodulation signal.

4. The method according to claim 2, characterized in that, when the preset parameter value of the intermodulation signal is the intermodulation signal quality, the preset parameter value of the intermodulation signal is compared with the update threshold. Compare and control the turning on and off of the intermodulation compensation circuit based on the comparison results including:

When the intermodulation signal quality is greater than or equal to the update threshold, detect whether the power amplifier triggers a test cycle, and the intermodulation signal quality is the reciprocal of the energy value of the intermodulation signal;

If the power amplifier triggers the test cycle, the intermodulation compensation circuit is caused to It is turned on within a preset period, and the preset period is greater than or equal to the test period.

5. A power amplifier, characterized in that the power amplifier includes: an update unit, configured to obtain an update threshold corresponding to the current number of carriers from a preset threshold according to the number of current carriers, the preset threshold There are at least two;

The first control unit is used to compare the preset parameter value of the intermodulation signal with the update threshold, and control the opening and closing of the intermodulation compensation circuit according to the comparison result.

6. The power amplifier according to claim 5, characterized in that when there are two preset thresholds, namely a first threshold and a second threshold, and the first threshold is greater than the second threshold,

The update unit is specifically used for:

7. The power amplifier according to claim 6, wherein when the preset parameter value of the intermodulation signal is the intermodulation signal quality, the first control unit is specifically used to:

8. The power amplifier according to claim 6, characterized in that when the preset parameter value of the intermodulation signal is the intermodulation signal quality, the power amplifier further includes: a second control unit, used for:

If the power amplifier triggers the test period, the intermodulation compensation circuit is turned on within a preset period, and the preset period is greater than or equal to the test period.