CN105429916A - Adaptive digital predistortion method of multiplex receiving link - Google Patents
Adaptive digital predistortion method of multiplex receiving link Download PDFInfo
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- CN105429916A CN105429916A CN201510366836.8A CN201510366836A CN105429916A CN 105429916 A CN105429916 A CN 105429916A CN 201510366836 A CN201510366836 A CN 201510366836A CN 105429916 A CN105429916 A CN 105429916A
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Abstract
The invention discloses an adaptive digital predistortion method of a multiplex receiving link. The method comprises the following steps: a predistortion module is inserted into an emission link, and the predistortion module is located between a baseband processing unit and a digital analog converter; a coupler is inserted at an output end of a radio-frequency power amplifier, and a signal after distortion of the radio-frequency power amplifier is coupled to an output link; a switch is inserted between an input end of a band-pass filter of a receiving link and an output end of the coupler; a parameter estimation module is inserted into the baseband processing unit, input signals of the parameter estimation module are baseband equivalence input and output signals of the radio-frequency power amplifier, and an output signal is a reverse non-linear distortion model parameter of the radio-frequency power amplifier; and, after a convergence of a parameter of the parameter estimation module, the parameter is copied to the predistortion module. Through utilization of the method, implementation cost of the adaptive digital presdistortion technology can be substantially reduced.
Description
Technical field
The present invention relates to a kind of digital pre-distortion method, particularly relate to a kind of adaptive digital pre-distortion method of multiplexing reception link, belong to wireless communication technology field.
Background technology
Radio-frequency power amplifier (RadioFrequencyPowerAmplifier is abbreviated as RFPA) is the topmost power consuming device of wireless communication system radio-frequency front-end, is also topmost nonlinear device simultaneously.The power efficiency of radio-frequency power amplifier is non-linear with it in negative correlativing relation.And the non-linear of radio-frequency power amplifier changes along with the change of external factor, power of such as ambient temperature, time and input signal etc.For the input term signal of radio-frequency power amplifier, non-linear make be with in distortion spectrum and band outside spectral regrowth, the former causes the error vector (ErrorVectorMagnitude of signal transmission, be abbreviated as EVM) worsen, the latter causes adjacent frequency to disturb (AdjacentChannelInterference, be abbreviated as ACI), thus cause the decline of whole performance in wireless communication systems.
The linearization technique of radio-frequency power amplifier can improve the linearity of radio-frequency power amplifier under the condition of less sacrifice power efficiency.In the ideal case, through linearization technique, the utilizable linearized region of radio-frequency power amplifier can expand within saturation region.Compared with traditional radio-frequency power amplifier, in the radio-frequency power amplifier of linearization process, the operable linear zone of input signal is expanded greatly.While guarantee operating efficiency, improve its linearity, signal distortion is reduced in tolerance interval.
Adaptive digital pre-distortion technology refers to that inserting one at input comprises power amplifier module against characteristic predistortion module, the distortion that pre-compensation power amplifier module brings.But as shown in Figure 1, traditional adaptive digital pre-distortion technology needs to introduce a newly-increased feedback link, for gathering the output signal of radio-frequency power amplifier to train the nonlinear distortion of radio-frequency power amplifier adaptively at transmitting terminal.This newly-increased feedback link adds the implementation cost of adaptive digital pre-distortion, especially for wireless terminal, is unfavorable for this technological industrialization.
Summary of the invention
For the deficiencies in the prior art, technical problem to be solved by this invention is the adaptive digital pre-distortion method providing a kind of multiplexing reception link.The method under the prerequisite not affecting existing receiver performance, can significantly reduce the implementation cost of adaptive digital pre-distortion technology.
For realizing above-mentioned goal of the invention, the present invention adopts following technical scheme:
An adaptive digital pre-distortion method for multiplexing reception link, comprises the steps:
In transmitting chain, insert predistortion module, described predistortion module is between baseband processing unit and digital to analog converter;
Coupler is inserted, by the signal coupling after described radio-frequency power amplifier distortion to output link at the output of radio-frequency power amplifier; Switch is inserted between the input and the output of described coupler of the band pass filter of receiver;
Insert parameter estimation module at baseband processing unit, the input signal of described parameter estimation module is the base band input and output signal of equal value of described radio-frequency power amplifier, outputs signal as described radio-frequency power amplifier is against the model parameter of nonlinear distortion;
After the parameter convergence of described parameter estimation module, described parameter is copied in described predistortion module.
Wherein more preferably, described predistortion module is operated in the calibration phase of wireless transmit/receive units.
Wherein more preferably, the operating frequency range of the band pass filter of described receiver covers the operating frequency of up link and down link simultaneously.
Wherein more preferably, the operating frequency range of the low pass filter of described receiver covers the spread spectrum component of distorted signal.
Wherein more preferably, the analog to digital converter of described receiver is operated in over-sampling rate, with the spread spectrum component of sampling distortion signal.
Wherein more preferably, when frequency division duplex system is in calibration phase, described switch is in closure state, makes the output signal of described radio-frequency power amplifier transfer to described baseband processing unit; When frequency division duplex system is in normal operating conditions, described switch is in off-state to realize radio transmission-receiving function.
Wherein more preferably, in described frequency division duplex system, in described baseband processing unit, increase digital frequency conversion module, intermediate-freuqncy signal is converted to baseband signal.
Wherein more preferably, in tdd systems, when wireless transmit/receive units is in emission state, closed described switch makes the output signal of described radio-frequency power amplifier transfer to described baseband processing unit; When wireless transmit/receive units is in accepting state, disconnect described switch to realize transmission-receiving function.
Compared with prior art, adaptive digital pre-distortion method provided by the present invention, by improving the operating frequency range of the circuit structure of existing wireless transmit/receive units, the band pass filter resetting receiver, low pass filter and analog to digital converter to reach the object that multiplexing reception link realizes adaptive digital pre-distortion, can reduce the implementation cost of adaptive digital pre-distortion technology significantly.
Accompanying drawing explanation
Fig. 1 is the system architecture schematic diagram of traditional adaptive digital pre-distortion technology;
Fig. 2 is the receiving-transmitting chain schematic diagram of wireless terminal.
Fig. 3 is the system architecture schematic diagram of the adaptive digital pre-distortion technology of multiplexing reception link provided by the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, technology contents of the present invention is described in further detail.
Figure 2 shows that in prior art, the receiving-transmitting chain schematic diagram of a typical wireless terminal.Because this type of wireless terminal is all equipped with wireless transmit/receive units, the present invention proposes a kind of adaptive digital pre-distortion method of multiplexing reception link accordingly.Be described as follows:
As shown in Figure 3, first the present invention inserts a predistortion module in the transmitting chain of existing wireless transmit/receive units.This predistortion module between baseband processing unit and digital to analog converter, and is operated in the calibration phase of wireless transmit/receive units, completely compatible with existing wireless transmit/receive units, does not increase extra expense.In this predistortion module, the nonlinear model used can be any nonlinear model that existing adaptive digital pre-distortion technology adopts, and has not repeated them here.
While insertion predistortion module, insert a coupler at the output of radio-frequency power amplifier, so that by the signal coupling after radio-frequency power amplifier distortion to output link.A switch is inserted between the input and the output of coupler of the band pass filter of receiver.A parameter estimation module is inserted at baseband processing unit.The input signal of this parameter estimation module is the base band input and output signal of equal value of radio-frequency power amplifier, outputs signal as radio-frequency power amplifier is against the model parameter of nonlinear distortion; After the parameter convergence of parameter estimation module, this parameter is copied in predistortion module.
In the present invention, reset the operating frequency range of the band pass filter of receiver, this operating frequency range needs the operating frequency simultaneously covering up link and down link.In addition, reset the operating frequency range of the low pass filter of receiver, this operating frequency range also needs the spread spectrum component covering distorted signal.Reselect the sample rate of the analog to digital converter of receiver, this analog to digital converter needs to be operated in over-sampling rate with the spread spectrum component of sampling distortion signal.
For Frequency Division Duplexing (FDD) (FDD) system, when whole system is in calibration phase, switch is in closure state, and the output signal of radio-frequency power amplifier is transferred to baseband processing unit; When whole system is in normal operating conditions, switch is in off-state to realize normal radio transmission-receiving function.
For Frequency Division Duplexing (FDD) (FDD) system, need to increase a digital frequency-variable module at baseband processing unit, intermediate-freuqncy signal is converted to baseband signal.The centre frequency of this intermediate-freuqncy signal is f
uL-f
dL, wherein, f
uLfor the up frequency of carrier frequency, f
dLfor the descending frequency of carrier frequency.
For time division duplex (TDD) system, when wireless transmit/receive units is in emission state, Closing Switch makes the output signal of radio-frequency power amplifier transfer to baseband processing unit; When wireless transmit/receive units is in accepting state, cut-off switch is to realize normal transmission-receiving function.When TDD system work in the transmission mode time, utilize adaptive digital pre-distortion method provided by the present invention can real-time tracking compensate the nonlinear distortion of radio-frequency power amplifier, completely compatible with existing wireless transmit/receive units.
Adaptive digital pre-distortion method provided by the present invention, by improving the operating frequency range of the circuit structure of existing wireless transmit/receive units, the band pass filter resetting receiver, low pass filter and analog to digital converter to reach the object that multiplexing reception link realizes adaptive digital pre-distortion, can reduce the implementation cost of adaptive digital pre-distortion technology significantly.
Above the adaptive digital pre-distortion method of multiplexing reception link provided by the present invention is described in detail.For one of ordinary skill in the art, to any apparent change that he does under the prerequisite not deviating from connotation of the present invention, all by formation to infringement of patent right of the present invention, corresponding legal liabilities will be born.
Claims (8)
1. an adaptive digital pre-distortion method for multiplexing reception link, is characterized in that comprising the steps:
In transmitting chain, insert predistortion module, described predistortion module is between baseband processing unit and digital to analog converter;
Coupler is inserted, by the signal coupling after described radio-frequency power amplifier distortion to output link at the output of radio-frequency power amplifier; Switch is inserted between the input and the output of described coupler of the band pass filter of receiver;
Insert parameter estimation module at baseband processing unit, the input signal of described parameter estimation module is the base band input and output signal of equal value of described radio-frequency power amplifier, outputs signal as described radio-frequency power amplifier is against the model parameter of nonlinear distortion;
After the parameter convergence of described parameter estimation module, described parameter is copied in described predistortion module.
2. adaptive digital pre-distortion method as claimed in claim 1, is characterized in that:
Described predistortion module is operated in the calibration phase of wireless transmit/receive units.
3. adaptive digital pre-distortion method as claimed in claim 1, is characterized in that:
The operating frequency range of the band pass filter of described receiver covers the operating frequency of up link and down link simultaneously.
4. adaptive digital pre-distortion method as claimed in claim 1, is characterized in that:
The operating frequency range of the low pass filter of described receiver covers the spread spectrum component of distorted signal.
5. adaptive digital pre-distortion method as claimed in claim 1, is characterized in that:
The analog to digital converter of described receiver is operated in over-sampling rate, with the spread spectrum component of sampling distortion signal.
6. adaptive digital pre-distortion method as claimed in claim 1, is characterized in that:
When frequency division duplex system is in calibration phase, described switch is in closure state, makes the output signal of described radio-frequency power amplifier transfer to described baseband processing unit; When frequency division duplex system is in normal operating conditions, described switch is in off-state to realize radio transmission-receiving function.
7. adaptive digital pre-distortion method as claimed in claim 6, is characterized in that:
In described frequency division duplex system, in described baseband processing unit, increase digital frequency conversion module, intermediate-freuqncy signal is converted to baseband signal.
8. adaptive digital pre-distortion method as claimed in claim 1, is characterized in that:
In tdd systems, when wireless transmit/receive units is in emission state, closed described switch makes the output signal of described radio-frequency power amplifier transfer to described baseband processing unit; When wireless transmit/receive units is in accepting state, disconnect described switch to realize transmission-receiving function.
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| CN110784237A (en) * | 2019-10-30 | 2020-02-11 | 电子科技大学 | Device and method for improving spurious-free dynamic range of receiver |
| CN111181499A (en) * | 2020-01-17 | 2020-05-19 | 南通大学 | Digital predistortion adaptive processing method and system for sea area access equipment |
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