CN107302471B

CN107302471B - DPD execution method, device and system

Info

Publication number: CN107302471B
Application number: CN201610232611.8A
Authority: CN
Inventors: 黄传义; 李丁一; 徐永德; 孙华荣; 周应学; 笪禹
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2016-04-14
Filing date: 2016-04-14
Publication date: 2020-05-26
Anticipated expiration: 2036-04-14
Also published as: CN107302471A

Abstract

The invention discloses a DPD (digital Pre-distortion) execution method, a device and a system, which are used for matching LUT (look-up table) generated by DPD training with signal power of UE (user equipment) in real time and avoiding abnormal or burnt-out power amplifier in RRU (remote radio unit). The method comprises the following steps: for each preset channel needing to execute DPD, executing a DPD process aiming at the channel; and acquiring a training sequence TR matched with the current signal power of the UE in the channel, and judging whether to execute the DPD process aiming at the channel again according to the TR. Wherein, the process of executing DPD is as follows: acquiring a TR (transmitter-receiver) matched with the current signal power of the UE in the channel, and acquiring a feedback sequence FB corresponding to the TR after acquiring the TR; and calculating a DPD coefficient according to the TR and the FB, and updating the calculated DPD coefficient into a lookup table LUT corresponding to the channel.

Description

DPD execution method, device and system

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a Digital Pre-Distortion (DPD) execution method, apparatus, and system.

Background

In a DPD scheme in an existing Frequency Division Duplex (FDD) system, a trigger condition of the DPD is a trigger scheme in a TDD system, that is, the trigger condition of the DPD is a driving trigger, wherein the driving trigger may be a cell trigger, a temperature change trigger, a DPD failure trigger, and the like.

According to the prior art, after a DPD procedure is completed once and a corresponding user lookup Table (Look Up Table, LUT) is configured, if the drive trigger condition is not met, the DPD procedure is not triggered again. However, in the FDD system, since the power of the service signal changes in real time, it may happen that a high-power signal is suddenly received after the DPD is configured with the training sequence (TR) at low power and the LUT is generated, and the power amplifier may be burned down because the high-power signal cannot be matched with the LUT.

In summary, the LUT generated by training using the existing DPD execution method cannot be matched with the signal power of the User Equipment (UE) in real time, which may easily cause abnormal or burnt power amplifier in a Remote Radio Unit (RRU).

Disclosure of Invention

The embodiment of the invention provides a DPD execution method, a device and a system, which are used for matching LUT generated by DPD training with signal power of UE (user equipment) in real time and avoiding abnormal work or burning of a power amplifier in RRU (radio remote unit).

The DPD execution method provided by the embodiment of the invention comprises the following steps:

for each preset channel needing to execute DPD, executing a DPD process aiming at the channel;

and acquiring a training sequence TR matched with the current signal power of the user equipment UE in the channel, and judging whether to execute the DPD process aiming at the channel again according to the TR.

In the method of the embodiment of the invention, the training sequence TR which is matched with the current signal Power of the UE in the channel is acquired, and whether the DPD process is executed aiming at the channel again is judged according to the TR, so that the real-time DPD process can be executed according to the signal Power change of the UE in the channel, the LUT generated by DPD training can be ensured to be matched with the signal Power of the UE in real time, the Adjacent Channel Power Ratio (ACPR) is improved, and the problem that the Power amplifier is abnormal or burnt because the signal Power of the UE directly enters the Power amplifier in the RRU after being raised is avoided.

Preferably, the performing the DPD procedure for the channel specifically includes:

and acquiring a TR (transmitter-receiver) matched with the current signal power of the UE in the channel, and determining the DPD (digital Pre-distortion) coefficient according to the TR when the TR meets a preset condition.

Because the TR matched with the current signal power of the UE in the channel is directly acquired, the LUT at the position for executing the DPD training according to the TR is more consistent with the actual situation, and a training sequence does not need to be applied to a Digital Signal Processor (DSP), thereby simplifying the DPD execution process and greatly shortening the DPD execution time.

Preferably, when the TR satisfies a preset condition, determining the DPD coefficient according to the TR specifically includes:

and judging whether the power of the TR is greater than a preset power threshold value or not, and determining the DPD coefficient according to the TR when the power of the TR is determined to be greater than the preset power threshold value.

By setting the power threshold, it can be ensured that the acquired power of the TR is not too low when the acquired power of the TR is greater than the preset power threshold, and a better effect can be achieved when the DPD coefficient is calculated according to the TR and the FB.

Preferably, when the power of the TR is determined to be smaller than the preset power threshold, a timer is started, and after the timer times out, the DPD procedure is executed again.

Therefore, by determining that the power of the TR is smaller than the preset power threshold value, the DPD execution failure can be determined, the subsequent DPD process does not need to be executed, and the efficiency of the whole DPD execution process is improved.

Preferably, the method includes acquiring a training sequence TR in the channel, which matches with the current signal power of the UE, and determining whether to execute the DPD procedure for the channel again according to the TR, and specifically includes:

periodically collecting a TR (transmitter-receiver) matched with the current signal power of the UE in the channel, and counting a first power value of the TR;

comparing the first power value with a second power value of TR used when DPD process is performed for the channel last time; and judging whether to execute the DPD process aiming at the channel again according to the comparison result.

Through the process, a DPD triggering mode is added, namely, the TR matched with the current signal power of the UE is counted in real time to judge whether to execute the DPD process on the channel again, so that the LUT generated by DPD training can be ensured to be matched with the signal power of the UE in real time, and the problem that the signal power of the UE directly enters a power amplifier in the RRU after being raised to cause abnormal work or burnout of the power amplifier is avoided.

Preferably, the determining whether to execute the DPD procedure for the channel again according to the comparison result specifically includes:

and when the first power value is larger than the second power value and the difference between the first power value and the second power value is larger than a preset value, determining to execute a DPD process for the channel again.

Preferably, the TR in the channel, which matches with the current signal power of the UE, is acquired from signal data of the UE, which is processed by the mean power protection module and the peak power protection module in sequence.

Thus, the accuracy of calculating the DPD coefficient can be improved.

outputting an interrupt signal for indicating successful acquisition of the TR, and acquiring a feedback sequence FB corresponding to the TR;

calculating a DPD coefficient according to the TR and the FB;

and when the DPD coefficient is determined to meet the preset requirement, updating the DPD coefficient into a lookup table LUT corresponding to the channel.

Preferably, the LUT is an LUT obtained by expanding the memory space as follows:

and compressing the address value of the LUT according to a preset compression amplitude value.

Therefore, the stepping of the LUT is reduced, the LUT can be used for storing data with larger capacity, the accuracy of the DPD is improved, and the linearity of the power amplifier is improved.

Preferably, the method further comprises:

and performing operation processing on the UE data in the channel according to the updated LUT, then judging whether the difference value between the amplitude of the processed data and the amplitude of the data before processing exceeds a preset threshold range, reporting an alarm when the difference value exceeds the preset threshold range, and executing a DPD process aiming at the channel again.

Preferably, when the DPD coefficient is calculated according to the TR and the FB, an iterative algorithm is used, and an adopted calculation parameter is selected according to a signal bandwidth.

Preferably, the selecting of the adopted calculation parameters according to the signal bandwidth specifically includes:

when the signal bandwidth is less than or equal to 20MHz, the calculation parameters selected include: the nonlinear order is 7, the memory depth is 5, the time delay is-1, and the cross term is 0;

when the signal bandwidth is greater than 20MHz, the calculation parameters selected to be used include: the nonlinear order is 7, the memory depth is 5, the time delay is-1, and the cross term is 1.

Therefore, different calculation parameters are selected according to the signal bandwidth, and the accuracy of calculating the DPD coefficient is improved.

An embodiment of the present invention provides a DPD execution apparatus, including:

the execution unit is used for executing a DPD process aiming at each preset channel needing to execute the DPD;

and the judging unit is used for acquiring a training sequence TR matched with the current signal power of the user equipment UE in the channel and judging whether to execute the DPD process aiming at the channel again according to the TR.

Preferably, the execution unit is specifically configured to:

Preferably, when the TR satisfies a preset condition, and the execution unit determines the DPD coefficient according to the TR, the execution unit is specifically configured to:

Preferably, the execution unit is further configured to: and when the power of the TR is determined to be smaller than a preset power threshold value, starting a timer, and after the timer is overtime, re-executing the DPD process.

Preferably, the determining unit is specifically configured to:

Preferably, when the determining unit determines whether to perform the DPD procedure for the channel again according to the comparison result, the determining unit is specifically configured to:

Preferably, when the execution unit executes the DPD procedure for the channel, the DPD procedure is specifically configured to:

calculating a DPD coefficient according to the TR and the FB;

Preferably, the LUT is an LUT obtained by expanding a storage space as follows:

Preferably, the execution unit is further configured to:

Preferably, when the execution unit calculates the DPD coefficient according to the TR and the FB, an iterative algorithm is used, and an adopted calculation parameter is selected according to a signal bandwidth.

Preferably, when the execution unit selects the adopted calculation parameter according to the signal bandwidth, the execution unit is specifically configured to:

The DPD execution system provided by the embodiment of the invention comprises the device.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic flowchart illustrating a DPD execution method according to an embodiment of the present invention;

fig. 2 is a block diagram of a forward link implementation of an if signal according to an embodiment of the present invention;

fig. 3 is a schematic overall flowchart of a DPD execution method according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a DPD actuator according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, a DPD implementation method provided in an embodiment of the present invention includes:

s101, executing a DPD process for each preset channel needing to execute DPD;

the preset channels that need to execute DPD may be all channels in the RRU or some channels in the RRU. The initial DPD procedure for a certain channel may be a procedure that triggers execution of a DPD procedure for the channel, for example, a procedure that triggers execution of a DPD when a cell is established.

S102, a training sequence TR which is matched with the current signal power of user equipment UE in the channel is collected, and whether a DPD process is executed for the channel again is judged according to the TR.

In step S102, the training sequence TR in the channel matching the current signal power of the UE may be acquired periodically, or acquired at random time, or acquired in a preset different time period, or acquired event-triggered, and the like, which is not limited in the embodiment of the present invention. Also, the process of acquiring TR may be performed, for example, under control of a processor.

In step S102, when there are signal data of multiple UEs in the channel at the same time, the TR acquired in the channel matching the current signal power of the UE is: TR matched to the total signal power of the plurality of UEs; when there is only one UE signal data in the channel, the TR acquired in the channel matching the current signal power of the UE is: TR matched to the signal power of the one UE.

It should be noted that step S102 may be executed during the execution of the DPD, or step S102 may be executed after the execution of the DPD is completed once.

Preferably, in step S101, the performing a DPD procedure for the channel specifically includes:

That is, when it is determined that the power of the TR is smaller than the preset power threshold, it is determined that the DPD is failed to be executed this time, so that the timer is started, and after the timer is overtime, the DPD procedure is executed again.

In the process of executing DPD, the reason why the power of the TR required to be acquired is greater than the preset threshold is to ensure that the power of the feedback sequence FB acquired subsequently is not too small, and if the power of the FB is too small, the signal-to-noise ratio of an Analog-to-Digital Converter (ADC) is too poor, thereby affecting the effect of DPD. The preset power threshold value is, for example, -23dBFs, that is, the subsequent DPD procedure can be continuously executed when the acquired TR power is greater than-23 dBFs, so that it can be ensured that the subsequently acquired FB power is greater than-25 dBFs, thereby ensuring the DPD effect.

The DPD procedure described above for this channel is described in more detail below, as follows:

step A, collecting a TR (transmitter-receiver) matched with the current signal power of the UE in the channel, outputting an interrupt signal for indicating successful collection of the TR when the collected TR power is determined to be larger than a preset power threshold value, and then collecting a feedback sequence FB corresponding to the TR;

here, as a preferred embodiment, after the TR is acquired, it is determined whether the power of the TR is greater than a preset power threshold, and when it is determined that the power of the TR is greater than the preset power threshold, an interrupt signal indicating successful acquisition of the TR is output. Of course, it is also possible to directly output an interrupt signal indicating successful acquisition of the TR without judging the power of the TR after it is determined that the TR is acquired, and then acquire the feedback sequence FB corresponding to the TR.

Preferably, TR and FB are acquired at the same slot position, specifically, the 5 th symbol acquisition sequence of each slot. Taking TR as an example, for example, the acquisition may be started from the 800 th data point of the 5 th symbol for a total of 16384 data points. If the predetermined threshold value of the collected TR is-23 dBFS, then correspondingly, the accumulated I ^2+ Q ^2 of the collected 16384 data points must be greater than 8.8 ^ 10. In addition, when TR is collected, if there is traffic data of the UE in the channel, TR is collected from the traffic data, and if there is no traffic data of the UE, non-traffic data of the UE may be selectively collected, for example, a Common Reference Signal (CRS) of a cell may be collected, and when the channel is configured with a single port, the Signal power of the collected CRS is 7.8dB lower than the full power, and when the channel is configured with a dual port, the Signal power of the collected CRS is 4.8dB lower than the full power.

B, calculating a DPD coefficient according to the TR and the FB;

and step C, when the DPD coefficient is determined to meet the preset requirement, updating the DPD coefficient into a lookup table LUT corresponding to the channel.

Preferably, whether the DPD coefficients meet the preset requirements can be determined, for example, as follows: comparing the calculated DPD coefficient with a preset value, and determining that the DPD coefficient meets the preset requirement when the DPD coefficient is smaller than the preset value; and when the DPD coefficient is larger than a preset value, reporting an alarm, and re-triggering the data acquisition of the TR and the FB. Moreover, preferably, when the number of times of acquiring TR and FB is greater than a preset number (for example, 3 times), a timer is started, a timing duration of the timer may be set according to an actual situation, for example, may be set to 3 minutes, and after the timer expires, the DPD procedure is executed for the channel again.

Preferably, an iterative algorithm (e.g., ECMP iterative algorithm) is used to calculate the DPD coefficients according to the TR and the FB, and the calculation parameters used are selected according to the signal bandwidth.

Preferably, the LUT for storing the latest DPD coefficient is an LUT obtained by expanding a storage space in the following manner:

For example, the original LUT is 9bit wide, and the address value is expanded to 1.5 times, resulting in a LUT of 15bit width.

Preferably, after the DPD coefficients are calculated and the latest DPD coefficients are updated into the LUT corresponding to the channel, the method further includes:

Preferably, the threshold range is set to 0.625 to 1.6, for example.

Preferably, step S102 specifically includes:

Here, the preset value may be set to 3dB, for example, that is, when the difference between the first power value and the second power value is greater than 3dB, it is determined to perform the DPD procedure for the channel again.

In step S102, it is determined whether to execute the DPD procedure for the channel again according to the acquired TR, and since the DPD procedure is executed by the FPGA, the DPD procedure may also be called as a method in which the DPD is triggered by the FPGA, or as a method in which the DPD is triggered by a power change.

Besides, whether to execute the DPD procedure for the channel again is determined according to the manner of triggering the DPD by the FPGA (or the manner of triggering the DPD by power change), or may be determined according to the manner of triggering the DPD by temperature change.

Preferably, determining whether to execute the DPD procedure for the channel again according to the temperature change includes:

the Device Driver (DD) inquires whether a variation in driving temperature exceeds a preset value (for example, a preset value of 5 degrees), and determines to perform the DPD procedure for the channel again when it is determined that the variation in temperature exceeds the preset value.

Preferably, in step S102, the acquired TR in the channel matching with the current signal power of the UE, and the TR in the channel matching with the current signal power of the UE acquired by the DPD calculation during the DPD execution may be implemented by the link shown in fig. 2.

Fig. 2 is a block diagram of a forward link implementation of an intermediate frequency signal.

Signal data of the UE is transmitted from an IR interface between a baseband processing unit (BBU) and an RRU to a link in the BBU, and is processed by a baseband hard-cutting module, so that baseband big data can be protected and a peak-to-average ratio of a baseband signal can be reduced, and then is processed by a Digital Up Conversion (DUC) module, a peak reduction Coefficient (CFR) module, and a hard-cutting module in sequence. For the hard clipping module, the clipping threshold may be set to-4 BFS, 20480 in decimal notation, and 5000 in hexadecimal notation, for example, so as to clip CFR missing clipped signals. The hard clipping module is followed by the DPD module, i.e., the DPD procedure is performed by the DPD module.

The mean power protection module and the peak power protection module are respectively arranged behind the DPD module, and the mean power protection module is arranged in front of the peak power protection module in the embodiment of the invention, mainly because the peak power protection module can influence the mean power of the signal after the signal is processed, the design is more reasonable. For the peak power protection module, for example, a hard peak clipping form may be adopted, the signal exceeding the preset threshold is not clipped to the average power any more, but is directly limited to the preset threshold, and for the setting of the threshold, for example, may be set to-1 dBFs, 29204 in decimal representation, and 50007214 in hexadecimal representation.

After the peak power protection module, the intermediate frequency power of the signal is counted, and a TR is collected after the peak power protection module, where the TR can reflect the current signal power of the UE, that is, the TR is matched with the current signal power of the UE. For the intermediate frequency power statistics, for example, 100 statistics of one frame may be performed within 1 second with a length of one frame being 10ms as the statistical data length. For the power of TR, statistics may be performed, for example, by symbol. After the intermediate frequency power statistics module, an Automatic Gain Control (AGC) module and a Digital-to-analog converter (DAC) module are respectively provided, where the AGC module is mainly used for adjusting a fractional part of link compensation. After the DAC module, corresponding to the analog link portion, the data may be finally transmitted to the power amplifier.

For the feedback ADC, the feedback ADC may be configured to receive feedback data sent by the analog link, and accordingly, the FB may be acquired in the feedback ADC link.

In addition, after the IR interface, the device further includes a baseband power statistics module for performing real-time statistics on the baseband power, and comparing the baseband power statistics with the intermediate frequency power statistics, and when a difference between the two power statistics results exceeds a preset value (e.g., 1dB), it can be considered that the digital intermediate frequency link has a problem, and an alarm is reported.

A complete example is given below.

Fig. 3 is a schematic overall flow chart of a DPD execution method according to an embodiment of the present invention, which includes the following steps:

s301, cell establishment, and the DPD process is triggered at the moment.

S302, start to execute the DPD procedure for the channel corresponding to a certain antenna.

And S303, triggering the FPGA to capture the TR.

Specifically, the processor may trigger the FPGA to grab the TR, that is, the FPGA grabs the TR under the control of the processor. And the TR grabbed by the FPGA is the TR matched with the current signal power of the UE in the channel.

S304, waiting for FPGA grabbing interruption. That is, after the FPGA waits for confirmation of acquisition of the TR that can be used to calculate the DPD coefficient, an interrupt signal indicating successful acquisition of the TR is output.

The method includes the steps of waiting for the FPGA to confirm that the TR capable of being used for calculating the DPD coefficient is acquired, for example, confirming that the power of the TR acquired by the FPGA is greater than a preset power threshold.

S305, judging whether the FPGA outputs an interrupt signal, if so, turning to S306; otherwise, the process proceeds to S307.

S306, the FPGA captures a feedback sequence FB corresponding to the TR, the TR and the FB are sent to the DSP, the DSP calculates a DPD coefficient according to the TR and the FB, and then S308 is executed.

And S307, judging whether the time for waiting for the FPGA to output the interrupt signal is more than 1S, if so, turning to S311, otherwise, turning to S304.

And S308, judging whether the DSP generates an alarm or not, if not, turning to S309, otherwise, turning to S310.

Specifically, for example, the DSP may determine whether the calculated DPD coefficient exceeds a preset threshold, generate an alarm if the calculated DPD coefficient exceeds the preset threshold, and not generate an alarm if the calculated DPD coefficient does not exceed the preset threshold.

S309, the calculated DPD coefficients are updated to an LUT in the FPGA, and then S315 is executed.

S310, judging whether the times of capturing the sequence are more than 3, if so, turning to S311; otherwise, the process proceeds to S303.

In this step, the threshold value is set to 3 times, but may be set to other values according to actual conditions.

S311, determining that the DPD procedure fails, and then, performing S312.

S312, the state machine is cleared, and then S313 is executed.

S313, start a timer (the timing length of the timer is set to 3 minutes, for example).

S314, the wait timer times out, and then the process proceeds to S302.

And S315, judging whether the iteration times are more than 3, if so, turning to S316, and otherwise, turning to S303.

And S316, judging whether the DPD process is executed for the channels corresponding to the preset number of antennas, if so, turning to S317, and otherwise, turning to S318.

That is, channels corresponding to which antennas in the RRU need to perform the DPD procedure are preset in this step, and it is determined whether all preset channels that need to perform the DPD have performed the DPD procedure.

And S317, the process normally exits, and waiting for triggering the DPD process next time.

S318, start to execute the DPD procedure for the channel corresponding to the next antenna, and then proceed to S303.

And S319, judging whether the change of the driving temperature exceeds a preset value, if so, turning to S302, and otherwise, turning to S320.

And S320, counting whether the power change of the TR is larger than 3dB by the FPGA, if so, turning to S302, and otherwise, turning to S321.

Specifically, the first power of the currently acquired TR is counted, and the first power is compared with the second power of the TR used when the DPD is executed last time, and if the first power is raised by 3dB compared with the second power, the DPD procedure is restarted (i.e., step S302 is performed). In addition, in this embodiment, the threshold value is set to 3dB, but of course, other values may be set.

S321, performing operation processing on the data of the UE in the channel according to the latest LUT.

Corresponding to the DPD execution method, referring to fig. 4, a DPD execution apparatus according to an embodiment of the present invention includes:

an execution unit 41, configured to execute a DPD procedure for each preset channel in which DPD needs to be executed;

a determining unit 42, configured to acquire a training sequence TR in the channel, where the training sequence TR matches with the current signal power of the user equipment UE, and determine whether to execute the DPD procedure for the channel again according to the TR.

The apparatus may be, for example, an RRU, and more specifically, an FPGA in the RRU.

Preferably, the execution unit 41 is specifically configured to:

Preferably, when TR satisfies a preset condition, and the execution unit 41 determines the DPD coefficient according to the TR, the execution unit is specifically configured to:

Preferably, the execution unit 41 is further configured to: and when the power of the TR is determined to be smaller than a preset power threshold value, starting a timer, and after the timer is overtime, re-executing the DPD process.

Preferably, the determining unit 42 is specifically configured to:

Preferably, when the determining unit 42 determines whether to perform the DPD procedure for the channel again according to the comparison result, it is specifically configured to:

Preferably, the determining unit 42 is further configured to: judging whether to execute the DPD process aiming at the channel again according to the temperature change, wherein the specific judgment process is as follows:

Preferably, when the executing unit 41 executes the DPD procedure for the channel, it is specifically configured to:

calculating a DPD coefficient according to the TR and the FB;

Preferably, the LUT is an LUT obtained by expanding a storage space as follows:

Preferably, the execution unit 41 is further configured to:

Preferably, the executing unit 41 adopts an iterative algorithm when calculating the DPD coefficient according to the TR and the FB, and selects an adopted calculation parameter according to a signal bandwidth.

Preferably, when the execution unit 41 selects the adopted calculation parameter according to the signal bandwidth, it is specifically configured to:

The embodiment of the invention also provides a DPD execution system, which at least comprises the DPD execution device.

In the embodiment of the present invention, each of the functional units may be implemented by a specific physical device such as a hardware processor.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A digital predistortion DPD implementation method, the method comprising:

acquiring a training sequence TR matched with the current signal power of user equipment UE in the channel, and judging whether to execute a DPD process for the channel again according to the TR, wherein the method specifically comprises the following steps:

comparing the first power value with a second power value of TR used when DPD process is performed for the channel last time; judging whether to execute the DPD process aiming at the channel again according to the comparison result;

wherein, judging whether to execute the DPD procedure for the channel again according to the comparison result specifically includes:

2. The method according to claim 1, wherein performing a DPD procedure for the channel specifically includes:

3. The method according to claim 2, wherein determining the DPD coefficient according to the TR when the TR satisfies a preset condition includes:

4. The method of claim 3, further comprising: and when the power of the TR is determined to be smaller than a preset power threshold value, starting a timer, and after the timer is overtime, re-executing the DPD process.

5. The method according to any one of claims 1 to 4, wherein the TR in the channel matching the current signal power of the UE is collected from the signal data of the UE processed by the mean power protection module and the peak power protection module in sequence.

6. The method according to claim 1, wherein performing a DPD procedure for the channel specifically includes:

calculating a DPD coefficient according to the TR and the FB;

7. The method of claim 6, wherein the LUT is an extended LUT with memory space as follows:

8. The method of claim 6, further comprising:

9. The method of claim 6, wherein an iterative algorithm is used to calculate the DPD coefficients based on the TR and the FB, and wherein the calculation parameters are selected based on the signal bandwidth.

10. The method according to claim 9, wherein selecting the employed calculation parameters according to the signal bandwidth specifically comprises:

11. A digital predistortion DPD actuator, the DPD actuator comprising:

a judging unit, configured to collect a training sequence TR in the channel, where the training sequence TR matches with the current signal power of the user equipment UE, and judge whether to execute a DPD procedure for the channel again according to the TR, where the judging unit is specifically configured to: periodically collecting a TR (transmitter-receiver) matched with the current signal power of the UE in the channel, and counting a first power value of the TR;

wherein, when the determining unit determines whether to execute the DPD procedure for the channel again according to the comparison result, the determining unit is specifically configured to:

12. The apparatus of claim 11, wherein the execution unit is specifically configured to:

13. The apparatus of claim 12, wherein when the TR satisfies a preset condition and the DPD coefficient is determined according to the TR, the performing unit is specifically configured to:

14. The apparatus of claim 13, wherein the execution unit is further configured to: and when the power of the TR is determined to be smaller than a preset power threshold value, starting a timer, and after the timer is overtime, re-executing the DPD process.

15. The apparatus according to any one of claims 11 to 14, wherein the TR in the channel matching the current signal power of the UE is collected from signal data of the UE processed by the mean power protection module and the peak power protection module in sequence.

16. The apparatus according to claim 11, wherein the performing unit, when performing the DPD procedure for the channel, is specifically configured to:

calculating a DPD coefficient according to the TR and the FB;

17. The apparatus of claim 16, wherein the LUT is an extended LUT that has been expanded in memory space as follows:

18. The apparatus of claim 16, wherein the execution unit is further configured to:

19. The apparatus of claim 16, wherein the execution unit employs an iterative algorithm when calculating DPD coefficients according to the TR and the FB, and selects the calculation parameters according to the signal bandwidth.

20. The apparatus according to claim 19, wherein the execution unit, when selecting the adopted calculation parameter according to the signal bandwidth, is specifically configured to:

21. A digital predistortion DPD implementation system, characterized in that it comprises an apparatus as claimed in any of claims 11 to 20.