WO2017091929A1 - 一种dpd系统及其实现方法 - Google Patents

一种dpd系统及其实现方法 Download PDF

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Publication number
WO2017091929A1
WO2017091929A1 PCT/CN2015/095929 CN2015095929W WO2017091929A1 WO 2017091929 A1 WO2017091929 A1 WO 2017091929A1 CN 2015095929 W CN2015095929 W CN 2015095929W WO 2017091929 A1 WO2017091929 A1 WO 2017091929A1
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signal
processing
dpd
baseband signal
target
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PCT/CN2015/095929
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English (en)
French (fr)
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李长亮
王炜
张春
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华为技术有限公司
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Priority to CN201580084956.7A priority Critical patent/CN108293030B/zh
Priority to PCT/CN2015/095929 priority patent/WO2017091929A1/zh
Publication of WO2017091929A1 publication Critical patent/WO2017091929A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a DPD system and an implementation method thereof.
  • the nonlinear nature of the transmit channel can distort the output digitally modulated signal, which is detrimental to digital demodulation.
  • the power amplifier requires a power backoff.
  • the existing Digital Pre-Distortion is a method to improve the spectrum expansion of wireless transmission signals.
  • the baseband unit generates information opposite to the distortion of the transmission channel (mainly referred to as the power amplifier) to compensate for the distortion of the transmission channel.
  • the DPD system requires a large bandwidth of the transmit channel and the feedback channel, so that the broadband predistortion information generated by the baseband unit (including the third/fifth/...) can be completely sent to the RF transmit channel.
  • the transmitted spurs and transmitted noise signals generated by the digital to analog converter (DAC) and the modulator are sent to the power amplifier output through the RF channel, which affects the noise floor of the air interface in wireless communication.
  • the problem is that the transmit spurious performance of the air interface at high power output and large gain conditions will exceed the out-of-band emission spurs and emissions of the specified transmit signal. Noise power.
  • the embodiment of the invention provides a DPD system and an implementation method thereof, which can improve the transmission power of the DPD system and meet the requirements of the transmission standard.
  • a DPD system which may include:
  • the DPD module is configured to receive the baseband signal, perform DPD processing on the baseband signal to generate the DPD signal, and output the baseband signal through the first output terminal disposed on the DPD module, and output the DPD through the second output terminal disposed on the DPD module. signal;
  • a baseband signal processing module is configured to receive and process the baseband signal into a target baseband signal, and the target baseband signal is a narrowband filtered target baseband signal:
  • a DPD signal processing module for receiving and processing the DPD signal into a target DPD signal :
  • a combiner for combining the target baseband signal and the target DPD signal to generate a combined signal
  • a signal output processing module for outputting a combined signal.
  • a front end of the second output end of the DPD module is provided with a delay processing module for delay processing the DPD signal, so that the target baseband signal and the target DPD signal are synchronously input to the combiner. And sending the delayed DPD signal to the second output.
  • a delay processing module is disposed between the DPD module and the DPD signal processing module, and is configured to perform delay processing on the DPD signal, so that the target baseband signal and the target DPD signal are synchronously input to the combiner.
  • the delayed DPD signal is sent to the DPD signal processing module.
  • the DPD signal processing module comprises:
  • a second DAC for receiving and converting the DPD signal into a DPD analog signal
  • a second modulator for receiving and modulating the DPD analog signal into a high frequency signal
  • the second VGA is configured to perform gain processing on the modulated DPD analog signal to obtain a target DPD signal.
  • the baseband signal processing module comprises:
  • the first DAC, the first modulator, and the narrowband filter are sequentially connected in series, and the target baseband signal is obtained by sequentially performing digital-to-analog conversion processing, modulation processing, and narrow-band filtering processing on the baseband signal.
  • the signal output processing module comprises:
  • a first PA configured to perform power amplification on the combined signal after the gain
  • the signal output terminal is used for outputting the combined signal after the gain processing and the power amplification processing.
  • the baseband signal processing module comprises:
  • the baseband signal is sequentially subjected to digital-to-analog conversion processing, modulation processing, narrow-band filtering processing, and gain processing to obtain a target baseband signal; or
  • the first DAC, the first modulator, the second VGA, and the narrowband filter are sequentially connected in series, and the target baseband signal is obtained by sequentially performing digital-to-analog conversion processing, modulation processing, gain processing, and narrow-band filtering processing on the baseband signal.
  • the signal output processing module comprises:
  • a second PA configured to perform power amplification on the combined signal after the gain
  • the signal output terminal is used for outputting the amplified combined signal.
  • the baseband signal processing module comprises:
  • the first DAC, the first modulator, the narrowband filter, the second VGA, and the third PA connected in series are sequentially obtained by performing digital-to-analog conversion processing, modulation processing, narrow-band filtering processing, gain processing, and power amplification processing on the baseband signal.
  • Target baseband signal or,
  • the first DAC, the first modulator, the second VGA, the narrowband filter, and the third PA connected in series are sequentially obtained by performing digital-to-analog conversion processing, modulation processing, gain processing, narrow-band filtering processing, and power amplification processing on the baseband signal.
  • Target baseband signal or,
  • the first DAC, the first modulator, the second VGA, the third PA, and the narrowband filter sequentially connected in series are sequentially obtained by performing digital-to-analog conversion processing, modulation processing, gain processing, power amplification processing, and narrow-band filtering processing on the baseband signal.
  • Target baseband signal For example,
  • system further comprises:
  • a feedback module configured to receive a feedback signal based on the output combined signal, and send the feedback signal to the DPD module
  • the DPD module is further configured to perform DPD processing on the baseband signal according to the feedback signal to generate a DPD signal.
  • the second aspect of the embodiment of the present invention further provides a method for implementing a DPD system, which may include:
  • the baseband signal is processed into a target baseband signal, and the target baseband signal is a narrowband filtered target baseband signal:
  • the method further comprises:
  • the DPD signal is subjected to delay processing to synchronously output the target baseband signal and the target DPD signal.
  • processing the DPD signal to the target DPD signal comprises:
  • the DPD signal is sequentially subjected to digital-to-analog conversion processing, modulation processing, and gain processing to obtain a target DPD signal.
  • processing the baseband signal to the target baseband signal comprises:
  • the target baseband signal is obtained by performing digital-to-analog conversion processing, modulation processing, and narrow-band filtering processing on the baseband signal in sequence.
  • the output combining signal comprises:
  • the combined signal after gain processing and power amplification processing is output.
  • processing the baseband signal to the target baseband signal comprises:
  • the target baseband signal is obtained by sequentially performing digital-to-analog conversion processing, modulation processing, gain processing, and narrow-band filtering processing on the baseband signal.
  • the output combining signal comprises:
  • the combined signal of the power amplification process is output.
  • processing the baseband signal to the target baseband signal comprises:
  • the baseband signal is sequentially subjected to digital-to-analog conversion processing, modulation processing, gain processing, power amplification processing, and narrow-band filtering processing to obtain a target baseband signal.
  • the method further comprises:
  • DPD processing is performed on the baseband signal according to the feedback signal to generate a DPD signal.
  • the embodiment of the present invention has the following advantages: the DPD module in the embodiment of the present invention does not combine the baseband signal and the generated DPD signal as a signal output after performing DPD processing on the baseband signal. It is divided into two outputs, and then the baseband signal and the DPD signal are respectively processed. Since the baseband signal has a narrow bandwidth, the narrowband filtering process on the baseband signal can effectively remove the transmit spur and transmit noise power except the baseband signal. The signal-to-noise ratio (SNR) of the baseband signal portion is improved, and then the DPD signal is separately processed, and then the processed target DPD signal and the target baseband signal are combined to generate a combined signal due to the DPD signal.
  • SNR signal-to-noise ratio
  • Figure 1 is a schematic diagram showing changes in efficiency as power backoff increases
  • FIG. 2 is a schematic structural view of a prior art DPD system
  • FIG. 3 is a diagram showing an embodiment of a DPD system according to an embodiment of the present invention.
  • FIG. 4 is a view showing another embodiment of a DPD system according to an embodiment of the present invention.
  • Figure 5 is a diagram showing another embodiment of a DPD system according to an embodiment of the present invention.
  • FIG. 6 is a view showing another embodiment of a DPD system according to an embodiment of the present invention.
  • FIG. 7 is a diagram showing an embodiment of a method for implementing a DPD system according to an embodiment of the present invention.
  • Embodiments of the present invention provide a DPD system and an implementation method thereof, which are used to improve the transmission power of a DPD system and meet the requirements of a transmission standard.
  • Fig. 1 is a schematic diagram showing the change of efficiency with the increase of power back-off.
  • the horizontal axis represents the power back-off amount and the vertical axis represents the vertical power axis.
  • FIG. 2 is a schematic structural diagram of a prior art DPD system, and the system may include:
  • the DPD module 201 is configured to perform predistortion processing on the received baseband signal.
  • the output of the DPD module is connected to the DAC 202, and the baseband signal with predistortion information is converted into an analog signal, and then the analog signal is modulated into a high frequency by the modulator 203.
  • the frequency analog signal is then subjected to gain processing by the VGA 204 to the high frequency analog signal, and finally, the PA205 performs power amplification processing on the high frequency analog signal after gain, and outputs the result.
  • a feedback mechanism is used, that is, the final output signal is sampled, a feedback signal is obtained, and the feedback signal is fed back to the DPD module 201.
  • the feedback signal also passes through the baseband signal carrying the predistortion information.
  • the reverse processing that is, the gain processing, the modulation processing, and the analog-to-digital conversion processing in sequence, the DPD module 201 receives The feedback signal is also used to correct the predistortion algorithm.
  • the transmit channel supports a wide bandwidth, which can send all the information generated by the DAC and the modulator to the air interface.
  • the problem is that the transmission spurious performance of the air interface under high power output and large gain conditions is exceeded.
  • FIG. 3 is a diagram of an embodiment of a DPD system according to an embodiment of the present invention.
  • an embodiment of the present invention provides a DPD system, which may include the following contents:
  • the DPD module 301 is configured to receive a baseband signal, perform DPD processing on the baseband signal to generate a DPD signal, and further output the baseband signal through the first output end disposed on the DPD module 301, and pass the second output disposed on the DPD module 301. Output DPD signal;
  • the DPD module 301 includes a line for receiving a baseband signal and a predistortion unit 3011 for processing the baseband signal for performing predistortion processing on the baseband signal.
  • the baseband signal processing module 302 is configured to receive and process the baseband signal into a target baseband signal, where the target baseband signal is a narrowband filtered target baseband signal:
  • the DPD signal processing module 303 is configured to receive and process the DPD signal into a target DPD signal:
  • the DPD signal processing module 303 may specifically include:
  • a second DAC 3031 for receiving and converting the DPD signal into a DPD analog signal
  • a second modulator 3032 for receiving and modulating the DPD analog signal into a high frequency signal
  • the second VGA 3033 is configured to perform gain processing on the modulated DPD analog signal to obtain a target DPD signal.
  • the actual processing of the processing module of the DPD signal processing module 303 includes the above three steps.
  • the second DAC 3031 performs digital-to-analog conversion on the signal outputted by the second output terminal, converts it into a DPD analog signal, and then
  • the second modulator 3032 modulates the DPD analog signal into a high frequency signal, and finally performs gain processing on the high frequency signal.
  • the purpose of the gain is to adjust the input multiplexer under the condition that the second DAC maintains the best signal to noise ratio.
  • the amplitude of the target DPD signal of 304 is to meet the nonlinear compensation power at the final different output power.
  • the DPD module 301 processes different baseband signals of different powers to generate different DPD signals, and the final output needs to be different according to the power of the baseband signal. Make adaptive adjustments.
  • a combiner 304 configured to combine the target baseband signal and the target DPD signal to generate a combined signal
  • the signal output processing module 305 is configured to output a combined signal.
  • the DPD module 301 does not combine the baseband signal and the generated DPD signal as one signal output, but divides into two outputs, and then processes the baseband signal and the DPD signal respectively. Due to the narrow bandwidth of the baseband signal, the narrowband filtering process on the baseband signal can effectively remove the transmit spur and transmit noise power except the baseband signal, improve the SNR of the baseband signal part, and then separately process the DPD signal. Then, the processed target DPD signal and the target baseband signal are combined to generate a combined signal. Since the DPD signal only contains predistortion information, the transmitted spurious and emitted noise is higher than the unprocessed baseband signal in the prior art.
  • the small, baseband signal is combined with the prior art baseband signal and the generated DPD signal to reduce the emission spurs and emission noise of the combined signal generated after filtering the transmitted spurs and the emitted noise as a signal output.
  • the spurious and emission noise of the air interface, and the reduction of the transmission of the air interface due to the reduction And noise emission, under the same RF spurious emission requirement indicators, higher transmit power may be employed transmit output signal.
  • baseband signal processing module 302 and the signal output processing module 305 in FIG. 3 have three different combinations, which are respectively introduced below.
  • FIG. 4 is another embodiment of a DPD system according to an embodiment of the present invention.
  • the baseband signal processing module 302 includes a first DAC 3021 and a first modulator 3022 which are sequentially connected in series.
  • the narrowband filter 3023 can obtain the target baseband signal by sequentially performing digital-to-analog conversion processing, modulation processing, and narrow-band filtering processing on the baseband signal.
  • the first DAC 3021 first performs digital-to-analog conversion processing to obtain a baseband analog signal, and then the first modulator 3022 modulates the baseband analog signal to modulate it into a baseband high-frequency analog signal. And narrowband filtering the baseband high-frequency analog signal by the narrowband filter 3023. Since the baseband signal is a narrowband signal, the narrowband filtering process can filter most of the baseband high-frequency analog signal emission noise and emission spurs. A high-quality high-frequency analog signal is obtained, and the narrow-band filtered baseband high-frequency analog signal is used as a target baseband signal output combiner 304 for combining processing.
  • the signal output processing module 305 can include a first VGA 3051 for inputting the combined signal Line gain processing
  • a first PA3052 configured to perform power amplification on the combined signal after the gain
  • the signal output end 3053 is configured to output a combined signal after the gain processing and the power amplification processing.
  • the combined signal is first subjected to gain processing by the first VGA 3051, and the purpose of the gain processing is to adapt the subsequent first PA 3052, that is, the adjustment is amplified by the first PA3052.
  • the power of the combined combined signal is then amplified by the first PA 3052 for the combined signal after the gain, and the combined signal after the amplification process can be output through the signal output terminal 3053.
  • the signal output terminal 3053 is only used as a port of the output combined signal, similar to the final signal output in the existing DPD system.
  • FIG. 5 is a diagram of another embodiment of a DPD system according to an embodiment of the present invention.
  • the baseband signal processing module 302 includes a first DAC 3021 and a first modulator 3022 that are sequentially connected in series.
  • the narrowband filter 3023 and the second VGA 3024 can obtain the target baseband signal by sequentially performing digital-to-analog conversion processing, modulation processing, narrow-band filtering processing, and gain processing on the baseband signal.
  • the first DAC 3021 first performs digital-to-analog conversion processing to obtain a baseband analog signal, and then the first modulator 3022 modulates the baseband analog signal to modulate it into a baseband high-frequency analog signal. And narrowband filtering the baseband high-frequency analog signal by the narrowband filter 3023. Since the baseband signal is a narrowband signal, the narrowband filtering process can filter most of the baseband high-frequency analog signal emission noise and emission spurs.
  • the purpose of the gain processing is to adapt the subsequent signal output processing module
  • the second PA 3054 in 305 performs the combined processing of the gain-processed baseband high-frequency analog signal as the target baseband signal output combiner 304.
  • the position between the second VGA 3024 and the narrowband filter 3023 can be exchanged, that is, the baseband analog signal after the modulation is completed, the gain processing can be performed first, and the gain processing is performed before the narrowband filtering processing is performed. Yes, it can be selected according to the actual device layout, and is not limited.
  • the signal output processing module 305 can include a second PA 3054 for performing power amplification on the combined signal after the gain;
  • the signal output end 3053 is configured to output a combined signal after the gain processing and the power amplification processing.
  • the combiner 304 outputs the combined signal
  • the combined signal after the gain is amplified by the first PA 3052
  • the combined signal after the amplification process can be output through the signal output terminal 3053.
  • the signal output terminal 3053 is only used as a port of the output combined signal, similar to the final signal output in the existing DPD system.
  • FIG. 6 is another embodiment of a DPD system according to an embodiment of the present invention.
  • the baseband signal processing module 302 includes a first DAC 3021 and a first modulator 3022 which are sequentially connected in series.
  • the narrowband filter 3023, the second VGA 3024, and the third PA 3025 can obtain a target baseband signal by sequentially performing digital-to-analog conversion processing, modulation processing, narrow-band filtering processing, gain processing, and power amplification processing on the baseband signal.
  • the first DAC 3021 first performs digital-to-analog conversion processing to obtain a baseband analog signal, and then the first modulator 3022 modulates the baseband analog signal to modulate it into a baseband high-frequency analog signal. And narrowband filtering the baseband high-frequency analog signal by the narrowband filter 3023. Since the baseband signal is a narrowband signal, the narrowband filtering process can filter most of the baseband high-frequency analog signal emission noise and emission spurs.
  • the gain processing is aimed at adapting the third PA3025, that is, adjusting The signal output from the third PA 3025 is used as the target baseband signal output combiner 304 to perform the combining process by the power of the combined signal outputted by the first PA 3052.
  • the order of the second VGA 3024 and the third PA 3025 cannot be replaced, that is, the modulated baseband high-frequency analog signal needs to be subjected to gain processing before power amplification processing, and for the narrowband filter 3023, It is disposed before the second VGA 3024, that is, before the gain processing, or after the second VGA 3024 and the third PA 3025, that is, after the gain processing and before the power amplification processing, the narrow-wave filtering processing is performed. Alternatively, it may be set after the third PA 3025, that is, after the power amplification processing, the narrow-wave filtering processing is performed.
  • the signal output processing module 305 may include a signal output end 3053 for outputting the combined signal after the gain processing and the power amplification processing.
  • the signal output end 3053 at this time is used to combine the combiner after the combiner 304 is combined.
  • the number is output.
  • the signal output 3053 acts only as a port for the output combined signal, similar to the final signal output in an existing DPD system.
  • the target DPD signal and the target baseband signal may be out of synchronization when the combiner is combined, and the output of the DPD module is required. The time difference between the DPD signal and the baseband signal is corrected.
  • a delay processing module 306 is disposed between the DPD module 301 and the DPD signal processing module 303 for delay processing the DPD signal, so that the target baseband signal and the target DPD signal are synchronously input to the combiner, and The delayed processed DPD signal is sent to the DPD signal processing module 303.
  • the DPD signal outputted by the second output end of the DPD module 301 can be delayed, so that when the combiner 304 combines the target DPD signal with the target baseband signal, the two signals are synchronized. Thereby achieving the best combination effect.
  • the delay processing module 306 may be disposed inside the DPD module 301, specifically before the second output terminal. And delaying the DPD signal before outputting the DPD signal from the second output terminal.
  • FIG. 4 The structure shown in FIG. 4 is taken as an example, and the actual implementation process of the structures of FIG. 5 and FIG. 6 is similar to that of FIG. 4.
  • the embodiment of the present invention is applied to a radio frequency front end, and can reduce the transmit noise power of the DPD system.
  • X 35dBm/MHz
  • the spurious power requirement is -50dBm/MHz. Since the baseband signal will enter the combiner 304 after narrowband filtering, the out-of-band emission noise can be suppressed to -174dBm/Hz, generally in order to finally achieve the first PA predistortion.
  • the power of the target DPD signal is generally lower than the power of the target baseband signal by KdB.
  • FIG. 7 is a block diagram of an implementation method of the DPD system according to the embodiment of the present invention.
  • an embodiment of the present invention provides a method for implementing a DPD system, which may include:
  • the method is to separately output the baseband signal and the DPD signal in two ways.
  • the target baseband signal is a narrowband-filtered target baseband signal.
  • the baseband signal is a narrowband signal, in order to reduce its emission noise as much as possible, a narrowband filtering process can be used to filter out the narrowband signal.
  • Other signals are outside to achieve the purpose of reducing the emission noise.
  • step 702 can include three different situations, which are separately described below.
  • Step 702 includes performing digital-to-analog conversion processing, modulation processing, and narrow-band filtering processing on the baseband signal in sequence to obtain a target baseband signal.
  • Step 702 includes sequentially performing digital-to-analog conversion processing, modulation processing, narrow-band filtering processing, and gain processing on the baseband signal to obtain a target baseband signal; or
  • the target baseband signal is obtained by sequentially performing digital-to-analog conversion processing, modulation processing, gain processing, and narrow-band filtering processing on the baseband signal.
  • the two cases in this case are similar to the two cases in which the baseband signal processing module 302 processes the baseband signal in the second case shown in FIG. 5, and details are not described herein again.
  • Step 702 includes sequentially performing digital-to-analog conversion processing, modulation processing, narrow-band filtering processing, gain processing, and power amplification processing on the baseband signal to obtain a target baseband signal; or
  • the baseband signal is sequentially subjected to digital-to-analog conversion processing, modulation processing, gain processing, power amplification processing, and narrow-band filtering processing to obtain a target baseband signal.
  • the three cases in this case are similar to the three cases in which the baseband signal processing module 302 processes the baseband signal in the case 3 shown in FIG. 6, and details are not described herein again.
  • the DPD signal is processed separately to obtain the target DPD signal before the combination.
  • processing the DPD signal into the target DPD signal includes:
  • the DPD signal is sequentially subjected to digital-to-analog conversion processing, modulation processing, and gain processing to obtain a target DPD signal.
  • the processing of the DPD signal is similar to the processing of the baseband signal carrying the predistortion information in the prior art.
  • the gain is further performed, and the purpose of the gain is to maintain the analog-to-digital conversion processing.
  • the amplitude of the target DPD signal that is combined is adjusted to meet the nonlinear compensation power at the final different output power.
  • the target baseband signal and the target DPD signal are generated, and the two are combined to finally obtain the combined signal.
  • step 705 is also divided into three different situations, which are respectively described below.
  • step 705 includes sequentially performing gain processing and power amplification processing on the combined signal, and outputting the combined signal after the gain processing and the power amplification processing.
  • the step 705 includes sequentially performing power amplification processing on the combined signal, and outputting the combined signal subjected to the power amplification processing.
  • step 705 is to output the combined signal.
  • the baseband signal and the generated DPD signal are not combined together as one signal output, but are divided into two outputs, and then the baseband signal and the DPD signal are respectively processed, due to the baseband signal.
  • the bandwidth is narrow, and the narrowband filtering process on the baseband signal can effectively remove the transmit spur and transmit noise power except the baseband signal, improve the SNR of the baseband signal part, and then separately process the DPD signal, and then process it.
  • the completed target DPD signal and the target baseband signal are combined to generate a combined signal. Since the DPD signal only contains predistortion information, the transmitted spurious and emission noise is smaller than the unprocessed baseband signal in the prior art.
  • the transmission spurs and emission noise of the combined signal generated by the signal after filtering the spurious and transmitting noise are combined with the prior art baseband signal and the generated DPD signal as a signal output, which reduces the air interface. Transmitting spurious and emission noise, and reducing the emission spurs and emissions of the air interface due to the reduction Sound, in the same RF spurious emission requirement indicators, higher transmit power may be employed transmit output signal.
  • the method further includes:
  • the DPD signal is subjected to delay processing to synchronously output the target baseband signal and the target DPD signal.
  • the delay of the DPD signal can also be performed.
  • the reason for the delay processing is that the target DPD signal and the target baseband signal may be out of synchronization when the combiner is combined, and the time difference between the DPD signal and the baseband signal output by the DPD module needs to be corrected.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • 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 units may or may not be physical units, that is, 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 purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically 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 a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention which is essential or contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

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Abstract

本发明提供了一种DPD系统及其实现方法。该系统包括DPD模块，用于接收基带信号，并对基带信号进行DPD处理产生DPD信号；基带信号处理模块，用于接收并将基带信号处理成目标基带信号，目标基带信号为经过窄带滤波的目标基带信号：DPD信号处理模块，用于接收并将DPD信号处理成目标DPD信号：合路器，用于将目标基带信号和目标DPD信号进行合路，产生合路信号；信号输出处理模块，用于输出合路信号。本发明实施例采用分别对基带信号和DPD信号进行处理，在合路之前提高了基带信号部分的信噪比，降低合路后的合路信号的发射噪声和发射杂散，在相同的射频发射杂散指标要求下，可采用更高的发射功率发射输出信号。

Description

一种DPD系统及其实现方法 技术领域
本发明涉及领域无线通信领域，尤其涉及的是一种DPD系统及其实现方法。
背景技术
无线通信系统中，发射通道(功放)的非线性特性会对输出的数字调制信号产生失真，这种失真不利于数字解调。为了使发射的信号信噪比满足接收解调器要求，功放需要功率回退量。
因此在各种无线协议标准中，如欧洲电信标准化协会(European Telecommunications Standards Institute，ETSI)以及第三代合作伙伴计划(3rd Generation Partnership Project，3GPP)等，对发射信号的带外杂散和噪声功率有明确的要求。
现有数字预失真技术(Digital Pre-Distortion，DPD)是改善无线发射信号频谱扩张的一种方法，通过基带单元产生和发射通道(主要指功放)失真相反的信息，用以补偿发射通道失真。DPD系统要求发射通道和反馈通道的带宽大，从而使得基带单元产生的宽带预失真信息(包括三阶/五阶/…)能够完整送到射频发射通道。
然而由数模转换器(Digital to analog converter，DAC)和调制器产生的发射杂散和发射噪声信号会通过射频通道发送到功放输出，影响无线通信中的空中接口的底噪，因此在这种方式由于将DAC和调制器产生的所有信息发送到空中接口，带来的问题是大功率输出和大增益条件下空中接口的发射杂散性能会超出规定的发射信号的带外发射杂散和发射噪声功率。
发明内容
本发明实施例提供了一种DPD系统及其实现方法，能够提高DPD系统的发送功率，又满足发射标准要求。
有鉴于此，本发明实施例第一方面提供一种DPD系统，可包括：
DPD模块，用于接收基带信号，并对基带信号进行DPD处理产生DPD信号，还用于通过设于DPD模块上第一输出端输出基带信号，通过设于DPD模块上的第二输出端输出DPD信号；
基带信号处理模块，用于接收并将基带信号处理成目标基带信号，目标基带信号为经过窄带滤波的目标基带信号：
DPD信号处理模块，用于接收并将DPD信号处理成目标DPD信号：
合路器，用于将目标基带信号和目标DPD信号进行合路，产生合路信号；
信号输出处理模块，用于输出合路信号。
在第一方面的一些实施例中，DPD模块内位于第二输出端的前端设有延时处理模块，用于对DPD信号进行延时处理，使得目标基带信号与目标DPD信号同步输入合路器，并将延时处理后的DPD信号发送至第二输出端。
在第一方面的一些实施例中，DPD模块与DPD信号处理模块之间设有延时处理模块，用于对DPD信号进行延时处理，使得目标基带信号与目标DPD信号同步输入合路器，并将延时处理后的DPD信号发送至DPD信号处理模块。
在第一方面的一些实施例中，DPD信号处理模块包括：
第二DAC，用于接收并将DPD信号转换成DPD模拟信号；
第二调制器，用于接收并将DPD模拟信号调制成高频信号；
第二VGA，用于对调制后的DPD模拟信号进行增益处理得到目标DPD信号。
在第一方面的一些实施例中，基带信号处理模块包括：
依次串接的第一DAC、第一调制器和窄带滤波器，通过对基带信号依次进行数模转换处理、调制处理和窄带滤波处理得到目标基带信号。
在第一方面的一些实施例中，信号输出处理模块包括：
第一VGA，用于对合路信号进行增益处理；
第一PA，用于对增益后的合路信号进行功率放大；
信号输出端，用于输出经过增益处理和功率放大处理后的合路信号。
在第一方面的一些实施例中，基带信号处理模块包括：
依次串接的第一DAC、第一调制器、窄带滤波器和第二VGA，通过对 基带信号依次进行数模转换处理、调制处理、窄带滤波处理和增益处理得到目标基带信号；或，
依次串接的第一DAC、第一调制器、第二VGA和窄带滤波器，通过对基带信号依次进行数模转换处理、调制处理、增益处理和窄带滤波处理得到目标基带信号。
在第一方面的一些实施例中，信号输出处理模块包括：
第二PA，用于对增益后的合路信号进行功率放大；
信号输出端，用于输出放大后的合路信号。
在第一方面的一些实施例中，基带信号处理模块包括：
依次串接的第一DAC、第一调制器、窄带滤波器、第二VGA和第三PA，通过对基带信号依次进行数模转换处理、调制处理、窄带滤波处理、增益处理和功率放大处理得到目标基带信号；或，
依次串接的第一DAC、第一调制器、第二VGA、窄带滤波器和第三PA，通过对基带信号依次进行数模转换处理、调制处理、增益处理、窄带滤波处理和功率放大处理得到目标基带信号；或，
依次串接的第一DAC、第一调制器、第二VGA、第三PA和窄带滤波器，通过对基带信号依次进行数模转换处理、调制处理、增益处理、功率放大处理和窄带滤波处理得到目标基带信号。
在第一方面的一些实施例中，系统还包括：
反馈模块，用于接收基于输出的合路信号的反馈信号，并将反馈信号发送至DPD模块；
DPD模块还用于根据反馈信号对基带信号进行DPD处理产生DPD信号。
本发明实施例第二方面还提供一种DPD系统的实现方法，可包括：
对接收的基带信号进行DPD处理产生DPD信号，分别输出基带信号和DPD信号；
将基带信号处理成目标基带信号，目标基带信号为经过窄带滤波的目标基带信号：
将DPD信号处理成目标DPD信号；
将目标基带信号与目标DPD信号进行合路产生合路信号；
输出合路信号。
在第二方面的一些实施例中，方法还包括：
对DPD信号进行延时处理，使得同步输出目标基带信号与目标DPD信号。
在第二方面的一些实施例中，将DPD信号处理成目标DPD信号包括：
对DPD信号依次执行数模转换处理、调制处理和增益处理得到目标DPD信号。
在第二方面的一些实施例中，将基带信号处理成目标基带信号包括：
依次对基带信号进行数模转换处理、调制处理和窄带滤波处理得到目标基带信号。
在第二方面的一些实施例中，输出合路信号包括：
对合路信号依次进行增益处理和功率放大处理；
输出经过增益处理和功率放大处理后的合路信号。
在第二方面的一些实施例中，将基带信号处理成目标基带信号包括：
对基带信号依次进行数模转换处理、调制处理、窄带滤波处理和增益处理得到目标基带信号；或，
对基带信号依次进行数模转换处理、调制处理、增益处理和窄带滤波处理得到目标基带信号。
在第二方面的一些实施例中，输出合路信号包括：
对合路信号依次进行功率放大处理；
输出经过功率放大处理的合路信号。
在第二方面的一些实施例中，将基带信号处理成目标基带信号包括：
对基带信号依次进行数模转换处理、调制处理、窄带滤波处理、增益处理和功率放大处理得到目标基带信号；或，
对基带信号依次进行数模转换处理、调制处理、增益处理、窄带滤波处理和功率放大处理得到目标基带信号；或，
对基带信号依次进行数模转换处理、调制处理、增益处理、功率放大处理和窄带滤波处理得到目标基带信号。
在第二方面的一些实施例中，方法还包括：
接收接收基于输出的合路信号的反馈信号；
根据反馈信号对基带信号进行DPD处理产生DPD信号。
从以上技术方案可以看出，本发明实施例具有以下优点：本发明实施例中的DPD模块在将基带信号进行DPD处理之后并非将基带信号和产生的DPD信号合在一起作为一个信号输出，而是分成两路输出，之后分别对基带信号和DPD信号进行处理，由于基带信号带宽窄，对基带信号进行窄带滤波处理能有效去除其上的除基带信号之外的发射杂散和发射噪声功率，提高了基带信号部分的信噪比(Signal Noise Ratio，SNR)，而后对DPD信号进行单独的处理，之后将处理完成的目标DPD信号和目标基带信号进行合路，产生合路信号，由于DPD信号只包含预失真信息，因此其发射杂散和发射噪声要比现有技术中未处理前的基带信号小，基带信号在滤除发射杂散和发射噪声后产生的合路信号的发射杂散和发射噪声相对于现有技术基带信号和产生的DPD信号合在一起作为一个信号输出的方式，降低了空中接口的发射杂散和发射噪声，并且由于降低了降低了空中接口的发散发射杂散和发散发射噪声，在相同的射频杂散指标要求下，可采用更高的发射功率发射输出信号。
附图说明
图1是随着功率回退的增加导致的效率的变化情形示意图；
图2是现有技术DPD系统的结构示意图；
图3为本发明实施例的DPD系统的一个实施例图；
图4是本发明实施例的DPD系统的另一个实施例图；
图5是本发明实施例的DPD系统的另一个实施例图；
图6是本发明实施例的DPD系统的另一个实施例图；
图7是本发明实施例的DPD系统的实现方法的一个实施例图。
具体实施方式
本发明实施例提供了一种DPD系统及其实现方法，用于提高DPD系统的发送功率，又满足发射标准要求。
为了使本技术领域的人员更好地理解本发明方案，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所 描述的实施例仅仅是本发明一部分的实施例，而不是全部的实施例。
以下分别进行详细说明。
本发明的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的实施例能够以除了在这里图示或描述的内容以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或模块的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或模块，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或模块。
现在的线性调制技术如多载波调制，尽管能提供良好的频谱效率，但由于高功率放大器(High-power Amplifier，HPA)的非线性，调制后产生的波动包络信号能引起随后的HPA产生互调失真，互调失真多呈现出邻频干扰、带内干扰现象.为了扩展HPA的线性，产生了多种预失真技术，但其原理却都是在功放之前进行预失真，使得预失真和高功放作为一个整体来看，其增益特性为线性，如图1所示，图1是随着功率回退的增加导致的效率的变化情形示意图，其中，横轴表示功率回退量，纵轴表示直流射频转换效率。
下面对现有的DPD系统进行介绍，请参见图2，图2是现有技术DPD系统的结构示意图，该系统可包括：
DPD模块201，用于对接收的基带信号进行预失真处理，DPD模块的输出端连接有DAC202，带有预失真信息的基带信号转换成模拟信号，之后经过调制器203将该模拟信号调制成高频模拟信号，之后在通过VGA204对该高频模拟信号进行增益处理，最后再由PA205对增益后的高频模拟信号进行功率放大处理后输出。
尽管能为一个器件确定特性并设计正确的预失真算法，但要对每个器件都进行上述工作在经济上则是不可行的。为了解决上述偏差，须使用反馈机制，即对最终输出的信号进行采样，得到反馈信号，并将反馈信号反馈至DPD模块201，具体的，该反馈信号也依次经过与携带预失真信息的基带信号的反向处理，即依次通过增益处理、调制处理和模数转换处理，DPD模块201接收 该反馈信号并用以校正预失真算法。
然而，发射通道支持的带宽很宽，可以将DAC和调制器产生的所有信息发送到空中接口，带来的问题是大功率输出、大增益条件下空中接口的发射杂散性能超标。
为了解决上述问题，本发明实施例才用将DPD信号与基带信号分离处理后合路的方式。具体的，请参阅图3，图3为本发明实施例的DPD系统的一个实施例图，如图3所示，本发明的一个实施例提供一种DPD系统，可包括以下内容：
DPD模块301，用于接收基带信号，并对基带信号进行DPD处理产生DPD信号，还用于通过设于DPD模块301上第一输出端输出基带信号，通过设于DPD模块301上的第二输出端输出DPD信号；
其中，DPD模块301中包括接收基带信号的线路以及处理基带信号的预失真单元3011，用于对基带信号进行预失真处理。
基带信号处理模块302，用于接收并将基带信号处理成目标基带信号，目标基带信号为经过窄带滤波的目标基带信号：
DPD信号处理模块303，用于接收并将DPD信号处理成目标DPD信号：
其中，作为可选的，DPD信号处理模块303具体可包括：
第二DAC3031，用于接收并将DPD信号转换成DPD模拟信号；
第二调制器3032，用于接收并将DPD模拟信号调制成高频信号；
第二VGA3033，用于对调制后的DPD模拟信号进行增益处理得到目标DPD信号。
可以看出，DPD信号处理模块303处理模块的实际处理包括上述三个步骤，首先是第二DAC3031将第二输出端输出的信号进行数模转换，将其转换为DPD模拟信号，接着再由第二调制器3032将该DPD模拟信号调制成高频信号，最后再对该高频信号进行增益处理，该增益的目的在于使得第二DAC保持最佳信噪比的条件下，调整进入合路器304的目标DPD信号的幅度，以符合最终不同输出功率下的非线性补偿功率，例如，DPD模块301处理不同功率的基带信号会产生不同的DPD信号，在最终输出时需要根据基带信号的功率不同进行适应性的调整。
合路器304，用于将目标基带信号和目标DPD信号进行合路，产生合路信号；
信号输出处理模块305，用于输出合路信号。
可以看出，DPD模块301在将基带信号进行DPD处理之后并非将基带信号和产生的DPD信号合在一起作为一个信号输出，而是分成两路输出，之后分别对基带信号和DPD信号进行处理，由于基带信号带宽窄，对基带信号进行窄带滤波处理能有效去除其上的除基带信号之外的发射杂散和发射噪声功率，提高了基带信号部分的SNR，而后对DPD信号进行单独的处理，之后将处理完成的目标DPD信号和目标基带信号进行合路，产生合路信号，由于DPD信号只包含预失真信息，因此其发射杂散和发射噪声要比现有技术中未处理前的基带信号小，基带信号在滤除发射杂散和发射噪声后产生的合路信号的发射杂散和发射噪声相对于现有技术基带信号和产生的DPD信号合在一起作为一个信号输出的方式，降低了空中接口的发射杂散和发射噪声，并且由于降低了降低了空中接口的发射杂散和发射噪声，在相同的射频发射杂散指标要求下，可采用更高的发射功率发射输出信号。
需要说明的是，图3中的基带信号处理模块302和信号输出处理模块305有三种不同的组合方式，下面分别进行介绍。
一、请参阅图4，图4是本发明实施例的DPD系统的另一个实施例图，在本实施例中，基带信号处理模块302包括依次串接的第一DAC3021、第一调制器3022和窄带滤波器3023，可通过对基带信号依次进行数模转换处理、调制处理和窄带滤波处理得到目标基带信号。
具体的，第一DAC3021在接收到基带信号之后，会首先进行数模转换处理，得到基带模拟信号，而后由第一调制器3022对该基带模拟信号进行调制，将其调制成基带高频模拟信号，并由窄带滤波器3023对该基带高频模拟信号进行窄带滤波处理，由于基带信号是窄带信号，通过此窄带滤波处理能将基带高频模拟信号绝大部分的发射噪声和发射杂散滤除，得到高质量的高频模拟信号，并将窄带滤波后的基带高频模拟信号作为目标基带信号输出合路器304进行合路处理。
此时，信号输出处理模块305可包括第一VGA3051，用于对合路信号进 行增益处理；
第一PA3052，用于对增益后的合路信号进行功率放大；
信号输出端3053，用于输出经过增益处理和功率放大处理后的合路信号。
可以看出，在合路器304输出合路信号之后，首先由第一VGA3051对该合路信号进行增益处理，该增益处理的目的在于适配后续的第一PA3052，即调整通过第一PA3052放大输出的合路信号的功率，之后由第一PA3052对增益后的合路信号进行放大处理，放大处理后的合路信号即可通过信号输出端3053进行输出。
可以理解的是，该信号输出端3053仅作为输出合路的信号的一个端口，与现有DPD系统中的最终的信号输出端类似。
二、请参阅图5，图5是本发明实施例的DPD系统的另一个实施例图，在本实施例中，基带信号处理模块302包括依次串接的第一DAC3021、第一调制器3022、窄带滤波器3023和第二VGA3024，可通过对基带信号依次进行数模转换处理、调制处理、窄带滤波处理和增益处理得到目标基带信号。
具体的，第一DAC3021在接收到基带信号之后，会首先进行数模转换处理，得到基带模拟信号，而后由第一调制器3022对该基带模拟信号进行调制，将其调制成基带高频模拟信号，并由窄带滤波器3023对该基带高频模拟信号进行窄带滤波处理，由于基带信号是窄带信号，通过此窄带滤波处理能将基带高频模拟信号绝大部分的发射噪声和发射杂散滤除，得到高质量的高频模拟信号，并对窄带滤波后的基带高频模拟信号由第二VGA3024对该基带高频模拟信号进行增益处理，该增益处理的目的在于适配后续的信号输出处理模块305中的第二PA3054，将增益处理后的基带高频模拟信号进行作为目标基带信号输出合路器304进行合路处理。
可以理解的是，第二VGA3024与窄带滤波器3023之间的位置是可以交换的，即完成调制后的基带模拟信号可先进行增益处理，完成增益处理之后再进行窄带滤波处理，两种方式均可，具体可按照实际的器件布置情况进行选择，不作限定。
此时，信号输出处理模块305可包括第二PA3054，用于对增益后的合路信号进行功率放大；
信号输出端3053，用于输出经过增益处理和功率放大处理后的合路信号。
可以看出，在合路器304输出合路信号之后，由第一PA3052对增益后的合路信号进行放大处理，放大处理后的合路信号即可通过信号输出端3053进行输出。
可以理解的是，该信号输出端3053仅作为输出合路的信号的一个端口，与现有DPD系统中的最终的信号输出端类似。
三、请参阅图6，图6是本发明实施例的DPD系统的另一个实施例图，在本实施例中，基带信号处理模块302包括依次串接的第一DAC3021、第一调制器3022、窄带滤波器3023、第二VGA3024和第三PA3025，可通过对基带信号依次进行数模转换处理、调制处理、窄带滤波处理、增益处理和功率放大处理后得到目标基带信号。
具体的，第一DAC3021在接收到基带信号之后，会首先进行数模转换处理，得到基带模拟信号，而后由第一调制器3022对该基带模拟信号进行调制，将其调制成基带高频模拟信号，并由窄带滤波器3023对该基带高频模拟信号进行窄带滤波处理，由于基带信号是窄带信号，通过此窄带滤波处理能将基带高频模拟信号绝大部分的发射噪声和发射杂散滤除，得到高质量的高频模拟信号，并对窄带滤波后的基带高频模拟信号由第二VGA3024对该基带高频模拟信号进行增益处理，该增益处理的目的在于适配第三PA3025，即调整通过第一PA3052放大输出的合路信号的功率，将第三PA3025输出的信号作为目标基带信号输出合路器304进行合路处理。
需要说明的是，第二VGA3024和第三PA3025的顺序是不能替换的，即调制后的基带高频模拟信号需要先进行增益处理后方可进行功率放大处理，对于窄带滤波器3023来说，除了可设置在第二VGA3024之前，即进行增益处理之前就进行窄波滤波处理，或者还可设置在第二VGA3024和第三PA3025之间，即在增益处理之后且功率放大处理之前进行窄波滤波处理，或者还可设置在第三PA3025之后，即在功率放大处理之后再进行窄波滤波处理。
此时，信号输出处理模块305可包括信号输出端3053，用于输出经过增益处理和功率放大处理后的合路信号。
可以看出，此时的信号输出端3053用于将合路器304合路之后的合路信 号进行输出。该信号输出端3053仅作为输出合路的信号的一个端口，与现有DPD系统中的最终的信号输出端类似。
需要说明的是，由于DPD模块301输出的DPD信号和基带信号之间可能有时差，目标DPD信号与目标基带信号在合路器合路时有可能出现不同步的情况，需要对DPD模块输出的DPD信号和基带信号之间时差进行矫正。
作为可选的，DPD模块301与DPD信号处理模块303之间设有延时处理模块306，用于对DPD信号进行延时处理，使得目标基带信号与目标DPD信号同步输入合路器，并将延时处理后的DPD信号发送至DPD信号处理模块303。举例来说，可对DPD模块301的第二输出端输出的DPD信号进行延时处理，以便于在合路器304进行目标DPD信号与目标基带信号合路时，保持两个信号时同步的，从而达到最佳的合路效果。
作为可选的，除了将延时处理模块306设置在DPD模块301与DPD信号处理模块303之间，还可将延时处理模块306设置在DPD模块301内部，具体可设置于第二输出端之前，在从第二输出端输出DPD信号之前对该DPD信号进行延时处理。
下面以一个实际的例子对本发明实施例进行说明，以图4所示结构为例，图5和图6的结构实际执行过程与图4类似。其中，本发明实施例应用于射频前端，可以降低DPD系统的发射噪声功率。
举例来说，以现有技术来说，假设调制器的输出带预失真的基带信号的平均功率为0dBm，即输出的带预失真的基带信号的实际功率为1mW，由于DPD信号与基带信号是结合的，信号外的发射杂散功率约-145dBm/Hz。若输出带外发射杂散功率要求为-50dBm/MHz，此时在这种DPD系统中，发射杂散值为(-145+60)dBm/MHz+X＝-50dBm/MHz、达到临界值。得出X为35dBm/MHz，(-145+60)dBm/MHz为将信号外的发射杂散功率由dBm/Hz转换为dBm/MHz，即10lg(10-145*106)dBm/MHz＝10lg(10-145)dBm/MHz+10lg(106)dBm/MHz＝(-145+60)dBm/MHz。即此DPD系统满足发射杂散的情况下，其最大输出功率为35dBm。
而采用本发明实施例方案时，假设调制器的输出的基带高频模拟信号的平均功率也为0dBm，由于10lg1＝0dBm，即输出的基带高频模拟信号的实际功 率为1mW，输出带外发射杂散功率要求为-50dBm/MHz，由于基带信号会通过窄带滤波后才进入合路器304，带外发射噪声能够被抑制在-174dBm/Hz，一般来说为了最终达到第一PA的预失真校正效果，目标DPD信号的功率比目标基带信号的功率一般要低KdB，例如，DPD信号的功率比目标基带信号的功率低20dB，若目标基带信号为0dBm时，则目标DPD信号的功率为-20dBm，相当于目标基带信号的功率比目标DPD信号的功率要大100倍，此时，目标DPD信号的发射噪声功率为-165dBm/Hz，在合路器304之中进行合路后，总发射噪声功率为10-17 . 4mW+10-16 . 5mW＝10-164 . 5mW，即合路后的总发射噪声为-164.5dBm/Hz，按照(-164.5+60)dBm/MHz+X＝-50dBm/MHz，得到X为54.5dBm/MHz，即按照本发明实施例方案同样在输出带外发射杂散功率要求为-50dBm/MHz，调制器输出的信号的功率为0dBm的情况下，最大发射功率能够达到54.5dBm，相对于现有35dBm大了19.5dB，相当于发射功率大了将近100倍。
上面对本发明实施例的DPD系统进行了介绍，下面对本发明实施例的DPD系统的实现方法进行介绍，请参阅图7，图7是本发明实施例的DPD系统的实现方法的一个实施例图，如图7所示，本发明实施例提供一种DPD系统的实现方法，可包括：
701、对接收的基带信号进行DPD处理产生DPD信号，分别输出基带信号和DPD信号。
可以理解的是，本发明实施例中对基带信号进行DPD处理后，采用的方式是分两路分别输出基带信号和DPD信号。
702、将基带信号处理成目标基带信号。
其中，目标基带信号为经过窄带滤波的目标基带信号：对于输出的基带信号，由于基带信号是窄带信号，为了尽可能降低其发射噪声，可对其采用窄带滤波处理，能够滤除除窄带信号之外的其他信号，从而达到降低发射噪声的目的。
需要说明的是，步骤702可包括三种不同的情形，下面分别进行说明。
一、步骤702包括依次对基带信号进行数模转换处理、调制处理和窄带滤波处理得到目标基带信号。
需要说明的是，此情形与图4所示的情形一中基带信号处理模块302对基带信号的处理类似，此处不再赘述。
二、步骤702包括对基带信号依次进行数模转换处理、调制处理、窄带滤波处理和增益处理得到目标基带信号；或，
对基带信号依次进行数模转换处理、调制处理、增益处理和窄带滤波处理得到目标基带信号。
需要说明的是，此情形中的两种情况与图5所示的情形二中基带信号处理模块302对基带信号的处理的两种情况类似，此处不再赘述。
三、步骤702包括对基带信号依次进行数模转换处理、调制处理、窄带滤波处理、增益处理和功率放大处理得到目标基带信号；或，
对基带信号依次进行数模转换处理、调制处理、增益处理、窄带滤波处理和功率放大处理得到目标基带信号；或，
对基带信号依次进行数模转换处理、调制处理、增益处理、功率放大处理和窄带滤波处理得到目标基带信号。
需要说明的是，此情形中的三种情况与图6所示的情形三中基带信号处理模块302对基带信号的处理的三种情况类似，此处不再赘述。
703、将DPD信号处理成目标DPD信号。
可以理解的是，由于是分成两路处理，DPD信号进行单独处理，得到合路前的目标DPD信号。
作为可选的，将DPD信号处理成目标DPD信号包括：
对DPD信号依次执行数模转换处理、调制处理和增益处理得到目标DPD信号。
可以看出，DPD信号的处理过程与现有技术中携带预失真信息的基带信号的处理类似，经过数模转换以及调制处理后，再进行增益，该增益的目的在于使得模数转换处理保持最佳信噪比的条件下，调整进行合路的目标DPD信号的幅度，以符合最终不同输出功率下的非线性补偿功率。
704、将目标基带信号与目标DPD信号进行合路产生合路信号。
可以理解的是，在完成基带信号和DPD信号的处理之后，会产生目标基带信号和目标DPD信号，将两者进行合路最终可得到合路信号。
705、输出合路信号。
需要说明的是，针对步骤702的三种不同情形，步骤705也分为三种不同的情形，下面分别进行说明。
一、当步骤702为情形一时，步骤705包括对合路信号依次进行增益处理和功率放大处理，并且输出经过增益处理和功率放大处理后的合路信号。
需要说明的是，此情形与图4所示的情形一中信号输出处理模块305对合路信号的处理类似，此处不再赘述。
二、当步骤702为情形二时，步骤705包括对合路信号依次进行功率放大处理，并且输出经过功率放大处理的合路信号。
需要说明的是，此情形与图5所示的情形二中信号输出处理模块305对合路信号的处理类似，此处不再赘述。
三、当步骤702为情形三时，步骤705为输出该合路信号。
需要说明的是，此情形与图6所示的情形三中信号输出处理模块305对合路信号的处理类似，此处不再赘述。
可以看出，在将基带信号进行DPD处理之后并非将基带信号和产生的DPD信号合在一起作为一个信号输出，而是分成两路输出，之后分别对基带信号和DPD信号进行处理，由于基带信号带宽窄，对基带信号进行窄带滤波处理能有效去除其上的除基带信号之外的发射杂散和发射噪声功率，提高了基带信号部分的SNR，而后对DPD信号进行单独的处理，之后将处理完成的目标DPD信号和目标基带信号进行合路，产生合路信号，由于DPD信号只包含预失真信息，因此其发射杂散和发射噪声要比现有技术中未处理前的基带信号小，基带信号在滤除发射杂散和发射噪声后产生的合路信号的发射杂散和发射噪声相对于现有技术基带信号和产生的DPD信号合在一起作为一个信号输出的方式，降低了空中接口的发射杂散和发射噪声，并且由于降低了降低了空中接口的发射杂散和发射噪声，在相同的射频发射杂散指标要求下，可采用更高的发射功率发射输出信号。
作为可选的，方法还包括：
对DPD信号进行延时处理，使得同步输出目标基带信号与目标DPD信号。
可以理解的是，在执行步骤703之前，还可进行对DPD信号进行延时处 理，该延时处理的原因在于目标DPD信号与目标基带信号在合路器合路时有可能出现不同步的情况，需要对DPD模块输出的DPD信号和基带信号之间时差进行矫正。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统，装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以 存储程序代码的介质。
以上所述，以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims (19)

  1. 一种DPD系统，其特征在于，包括：
    数字预失真DPD模块，用于接收基带信号，并对所述基带信号进行DPD处理产生DPD信号，还用于通过设于所述DPD模块上第一输出端输出基带信号，通过设于所述DPD模块上的第二输出端输出所述DPD信号；
    基带信号处理模块，用于接收并将所述基带信号处理成目标基带信号，所述目标基带信号为经过窄带滤波的目标基带信号：
    DPD信号处理模块，用于接收并将所述DPD信号处理成目标DPD信号：
    合路器，用于将所述目标基带信号和目标DPD信号进行合路，产生合路信号；
    信号输出处理模块，用于输出所述合路信号。
  2. 根据权利要求1所述的DPD系统，其特征在于：所述DPD模块内位于第二输出端的前端设有延时处理模块，用于对所述DPD信号进行延时处理，使得所述目标基带信号与目标DPD信号同步输入所述合路器，并将延时处理后的DPD信号发送至第二输出端。
  3. 根据权利要求1所述的DPD系统，其特征在于：所述DPD模块与所述DPD信号处理模块之间设有延时处理模块，用于对所述DPD信号进行延时处理，使得所述目标基带信号与目标DPD信号同步输入所述合路器，并将延时处理后的DPD信号发送至DPD信号处理模块。
  4. 根据权利要求1至3中任一项所述的DPD系统，其特征在于，所述DPD信号处理模块包括：
    第二数模转换器DAC，用于接收并将所述DPD信号转换成DPD模拟信号；
    第二调制器，用于接收并将所述DPD模拟信号调制成高频信号；
    第二可变增益放大器VGA，用于对所述调制后的DPD模拟信号进行增益处理得到目标DPD信号。
  5. 根据权利要求1至4中任一项所述的DPD系统，其特征在于，所述基带信号处理模块包括：
    依次串接的第一DAC、第一调制器和窄带滤波器，通过对所述基带信号 依次进行数模转换处理、调制处理和窄带滤波处理得到目标基带信号。
  6. 根据权利要求5所述的DPD系统，其特征在于，所述信号输出处理模块包括：
    第一VGA，用于对所述合路信号进行增益处理；
    第一功率放大器PA，用于对增益后的合路信号进行功率放大；
    信号输出端，用于输出经过所述增益处理和所述功率放大处理后的合路信号。
  7. 根据权利要求1至4中任一项所述的DPD系统，其特征在于，所述基带信号处理模块包括：
    依次串接的第一DAC、第一调制器、窄带滤波器和第二VGA，通过对所述基带信号依次进行数模转换处理、调制处理、窄带滤波处理和增益处理得到目标基带信号；或，
    依次串接的第一DAC、第一调制器、第二VGA和窄带滤波器，通过对所述基带信号依次进行数模转换处理、调制处理、增益处理和窄带滤波处理得到目标基带信号。
  8. 根据权利要求7所述的DPD系统，其特征在于，所述信号输出处理模块包括：
    第二PA，用于对增益后的合路信号进行功率放大；
    信号输出端，用于输出放大后的合路信号。
  9. 根据权利要求1至4中任一项所述的DPD系统，其特征在于，所述基带信号处理模块包括：
    依次串接的第一DAC、第一调制器、窄带滤波器、第二VGA和第三PA，通过对所述基带信号依次进行数模转换处理、调制处理、窄带滤波处理、增益处理和功率放大处理得到目标基带信号；或，
    依次串接的第一DAC、第一调制器、第二VGA、窄带滤波器和第三PA，通过对所述基带信号依次进行数模转换处理、调制处理、增益处理、窄带滤波处理和功率放大处理得到目标基带信号；或，
    依次串接的第一DAC、第一调制器、第二VGA、第三PA和窄带滤波器，通过对所述基带信号依次进行数模转换处理、调制处理、增益处理、功率放大 处理和窄带滤波处理得到目标基带信号。
  10. 根据权利要求1至9中任一项所述的DPD系统，其特征在于，所述系统还包括：
    反馈模块，用于接收基于所述输出的合路信号的反馈信号，并将所述反馈信号发送至DPD模块；
    所述DPD模块还用于根据所述反馈信号对所述基带信号进行DPD处理产生所述DPD信号。
  11. 一种DPD系统的实现方法，其特征在于，包括：
    对接收的基带信号进行数字预失真DPD处理产生DPD信号，分别输出所述基带信号和DPD信号；
    将所述基带信号处理成目标基带信号，所述目标基带信号为经过窄带滤波的目标基带信号：
    将所述DPD信号处理成目标DPD信号；
    将所述目标基带信号与所述目标DPD信号进行合路产生合路信号；
    输出所述合路信号。
  12. 根据权利要求11所述的DPD系统的实现方法，其特征在于，所述方法还包括：
    对所述DPD信号进行延时处理，使得同步输出所述目标基带信号与目标DPD信号。
  13. 根据权利要求11或12所述的DPD系统的实现方法，其特征在于，所述将所述DPD信号处理成目标DPD信号包括：
    对所述DPD信号依次执行数模转换处理、调制处理和增益处理得到所述目标DPD信号。
  14. 根据权利要求11至13中任一项所述的DPD系统的实现方法，其特征在于，所述将所述基带信号处理成目标基带信号包括：
    依次对所述基带信号进行数模转换处理、调制处理和窄带滤波处理得到目标基带信号。
  15. 根据权利要求14所述的DPD系统的实现方法，其特征在于，所述输出所述合路信号包括：
    对所述合路信号依次进行增益处理和功率放大处理；
    输出经过所述增益处理和功率放大处理后的合路信号。
  16. 根据权利要求11至13中任一项所述的DPD系统的实现方法，其特征在于，所述将所述基带信号处理成目标基带信号包括：
    对所述基带信号依次进行数模转换处理、调制处理、窄带滤波处理和增益处理得到目标基带信号；或，
    对所述基带信号依次进行数模转换处理、调制处理、增益处理和窄带滤波处理得到目标基带信号。
  17. 根据权利要求16所述的DPD系统的实现方法，其特征在于，所述输出所述合路信号包括：
    对所述合路信号依次进行功率放大处理；
    输出经过所述功率放大处理的合路信号。
  18. 根据权利要求11至13中任一项所述的DPD系统的实现方法，其特征在于，所述将所述基带信号处理成目标基带信号包括：
    对所述基带信号依次进行数模转换处理、调制处理、窄带滤波处理、增益处理和功率放大处理得到目标基带信号；或，
    对所述基带信号依次进行数模转换处理、调制处理、增益处理、窄带滤波处理和功率放大处理得到目标基带信号；或，
    对所述基带信号依次进行数模转换处理、调制处理、增益处理、功率放大处理和窄带滤波处理得到目标基带信号。
  19. 根据权利要求11至18中任一项所述的DPD系统的实现方法，其特征在于，所述方法还包括：
    接收接收基于所述输出的合路信号的反馈信号；
    根据所述反馈信号对所述基带信号进行DPD处理产生所述DPD信号。
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012112360A1 (en) * 2011-02-16 2012-08-23 Analog Devices, Inc. Digital pre-distortion
CN103493382A (zh) * 2012-03-09 2014-01-01 华为技术有限公司 抵消多载波发射干扰的方法、装置、设备及系统
CN104253588A (zh) * 2013-06-28 2014-12-31 富士通株式会社 失真补偿设备、失真补偿方法和无线电通信设备
CN104468437A (zh) * 2013-09-12 2015-03-25 富士通株式会社 数字预失真发射机及其控制方法
CN104883140A (zh) * 2015-06-03 2015-09-02 中国科学院微电子研究所 基于宽带射频功率放大器的数字预失真装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012112360A1 (en) * 2011-02-16 2012-08-23 Analog Devices, Inc. Digital pre-distortion
CN103493382A (zh) * 2012-03-09 2014-01-01 华为技术有限公司 抵消多载波发射干扰的方法、装置、设备及系统
CN104253588A (zh) * 2013-06-28 2014-12-31 富士通株式会社 失真补偿设备、失真补偿方法和无线电通信设备
CN104468437A (zh) * 2013-09-12 2015-03-25 富士通株式会社 数字预失真发射机及其控制方法
CN104883140A (zh) * 2015-06-03 2015-09-02 中国科学院微电子研究所 基于宽带射频功率放大器的数字预失真装置

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