WO2014171632A1 - Système d'émission mimo comprenant un détecteur d'enveloppe et procédé de conception de dispositif de prédistorsion constituant un système d'émission mimo - Google Patents

Système d'émission mimo comprenant un détecteur d'enveloppe et procédé de conception de dispositif de prédistorsion constituant un système d'émission mimo Download PDF

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Publication number
WO2014171632A1
WO2014171632A1 PCT/KR2014/001942 KR2014001942W WO2014171632A1 WO 2014171632 A1 WO2014171632 A1 WO 2014171632A1 KR 2014001942 W KR2014001942 W KR 2014001942W WO 2014171632 A1 WO2014171632 A1 WO 2014171632A1
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signal
predistorter
transmission
digital
transmitter
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PCT/KR2014/001942
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English (en)
Korean (ko)
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안승혁
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주식회사 아이앤씨테크놀로지
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Publication of WO2014171632A1 publication Critical patent/WO2014171632A1/fr

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • H03F1/3247—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using feedback acting on predistortion circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • H03F1/3252—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using multiple parallel paths between input and output
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/62—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems

Definitions

  • the present invention relates to a Multiple Input Multiple Output (MIO) transmission system, and in particular, an MIO transmission system including an envelope detector which minimizes the cost of implementing a feedback path by acquiring distortion information of a power amplifier with an envelope detector that is simple to implement.
  • MIO Multiple Input Multiple Output
  • next-generation communication systems have attempted to improve the density of data per frequency. Attempts to increase data density per frequency include using higher modulation orders, such as 256 Quadrature Amplitude Modulation (QAM), or transmitting multiple data streams simultaneously on the same frequency using multiple antennas. These methods commonly require higher quality transmission signals.
  • modulation orders such as 256 Quadrature Amplitude Modulation (QAM)
  • QAM Quadrature Amplitude Modulation
  • the power amplifier used in the transmitter is the most power dissipating part in the transmitter.
  • the nonlinearity of the power amplifier is the main cause of the nonlinearity of the transmission signal, and various linearization techniques have been studied to solve this problem.
  • the digital predistorter which precompensates and precompensates the nonlinear characteristics of the power amplifier in the digital domain has been widely known as a method for increasing the efficiency of the power amplifier by effectively improving the linearity characteristic of the power amplifier.
  • Digital predistorters have been mainly applied in wireless base stations, but in recent years, attempts have been made to apply them to wireless communication terminals. Accordingly, due to the characteristics of the wireless terminal in which implementation cost and power consumption are more important than those of the wireless base station, more attention is paid to the implementation cost of the digital predistorter.
  • the digital predistorter down-converts the RF (Radio Frequency) output signal of the power amplifier to obtain a nonlinear distorted baseband signal, and an equivalent power amplifier at baseband from the original undistorted transmission signal and the fed back distortion signal.
  • RF Radio Frequency
  • most digital predistorters additionally require a feedback path of the same structure as a conventional receiver, and the implementation cost of this feedback path is a big part of the overall implementation cost of the digital predistorter.
  • MIMO Multiple-Input Multiple-Output
  • MIMO is a technique for increasing the transmission and reception data capacity of the wireless communication, and uses a plurality of antennas in the transmitting end and the receiving end, and increases the capacity of the data transmitted in proportion to the number of antennas used.
  • FIG. 1 shows a configuration of a MIO transmission system including a digital predistorter.
  • the MIO transmission system 100 includes a first transmitter 110, a second transmitter 120, an attenuator 130, a feedback path unit 140, and an adaptive algorithm implementation unit 150. do.
  • Each of the transmitters 110 and 120 includes a predistorter 111 and 121, a digital analog converter 112 and 122, a modulator 113 and 123, a power amplifier 114 and 124, and a transmission antenna 115 and 125.
  • the feedback path unit 140 includes a selector 141, a demodulator 142, and an analog to digital converter 143.
  • the signals output from the power amplifiers 114 and 124 included in the two transmitters 110 and 120 are attenuated by the attenuators 130 including the attenuators 131 and 132, respectively, and then transferred to the feedback path unit 140. do.
  • the MIO transmission system 100 assumes that there are a plurality of transmission paths, that is, a plurality of transmitters, but there are two transmission paths 110 and 120 for convenience of description.
  • each transmitter may share one feedback path unit 130 using the selector 141.
  • the solid line indicates a signal path when training the predistorter 111 included in the first transmitter 110
  • the dotted line indicates the predistorter 121 included in the second transmitter 120.
  • the signal path of the case is shown, and the baseband input signal x (n) is shown as two transmission lines since it is a complex signal.
  • a feedback path unit 140 having the same structure as a conventional receiver should be added.
  • two I / Q mixers and two LPFs are used. (Low Pass Filter), and two ADCs (Analog to Digital Convertor).
  • the technical problem to be solved by the present invention is to provide a MIO transmission system including an envelope detector that minimizes the implementation cost of the feedback path by acquiring the distortion information of the power amplifier with an envelope detector that is simple to implement.
  • Another technical problem to be solved by the present invention is to provide a predistorter design method for configuring a MIO transmission system for designing a predistorter included in the MIO transmission system.
  • the MIO transmission system for achieving the above technical problem includes a first transmitter, a second transmitter, a feedback path unit and an adaptive algorithm transition unit.
  • the first transmitter comprises: a first predistorter for predistorting baseband first digital transmission data; a plurality of first digital analog converters for converting a signal distorted in the first predistorter into an analog signal; converted analog A first modulator for modulating a signal, a first power amplifier for amplifying an output of the first modulator to generate a first transmission signal, and a first antenna for transmitting the first transmission signal to the outside.
  • the second transmitter includes a second predistorter for predistorting second baseband digital transmission data, a plurality of second digital analog converters for converting a signal distorted in the second predistorter into an analog signal, and converted analog
  • a second modulator for modulating the signal
  • a second power amplifier for amplifying the output of the second modulator to generate a second transmission signal
  • a second antenna for transmitting the second transmission signal to the outside.
  • the feedback path unit generates a digital error signal using the first transmission signal, the second transmission signal, the first modulated signal output from the first modulator, and the second modulated signal output from the second modulator.
  • the adaptive algorithm implementing unit comprises a first control signal used to set the first predistorter and the second predistorter using the first digital transmission data, the second digital transmission data and the digital error signal; Generate a second control signal.
  • the predistorter design method constituting the MIO transmission system according to the present invention for achieving the another technical problem is used to compensate for the distortion of the transmission signal output from the MIO transmission system according to claim 4, the training signal input And an error signal generation step, an envelope signal detection step, a digital error signal generation step, and a control signal generation step.
  • the training signal input step applies the same baseband digital transmission data to the first transmitter and the second transmitter.
  • the error signal generating step generates the error signal which is a difference signal between a signal attenuated by a transmission signal output from a transmitter to design a predistorter and a modulation signal of the other transmitter.
  • the envelope signal detecting step detects the envelope signal which is an envelope of the error signal.
  • the digital error signal generating step converts the envelope signal in an analog state into a digital signal to generate the digital error signal.
  • the control signal generating step generates a control signal of a corresponding predistorter using the first digital transmission data, the second digital transmission data, and the digital error signal.
  • the feedback path required for the design of the digital predistorter can be very simply implemented by a simple envelope detector and a simple circuit configuration, there is an advantage that the overall transmitter implementation cost can be greatly reduced.
  • FIG. 1 shows a configuration of a MIO transmission system including a digital predistorter.
  • FIG. 2 shows a MIO transmission system including an envelope detector according to the present invention.
  • 3 shows the signal flow of the MIO transmission system when designing the predistorter included in the first transmitter.
  • FIG 4 shows the signal flow of the MIO transmission system when designing the predistorter included in the second transmitter.
  • FIG. 5 is a signal flow diagram of a design method of a predistorter constituting a MIO transmission system according to the present invention.
  • FIG. 6 is a more simplified block diagram of the problem of power amplifier model estimation.
  • the MIO transmission system proposed by the present invention has a plurality of transmission paths that can be represented by a transmitter, inputs the same baseband input signal x (n) to two transmitters arbitrarily selected among the plurality of transmitters, and It is a structure that uses the other transmission path to design the predistorter included in one of the transmitters, and in particular, the distortion information of the power amplifier, which is one of the information needed to design the predistorter, is obtained by a simple envelope detector.
  • a separate transmission path that is not actually used is added to perform a method of comparing the distorted transmission signal and the undistorted input signal in the RF (Radio Frequency) frequency domain by the power amplifier installed at the output of the transmitter.
  • RF Radio Frequency
  • all transmitters may not be used simultaneously according to a communication standard or scenario, that is, a schedule set in advance with respect to the use of the transmitter.
  • a communication standard or scenario that is, a schedule set in advance with respect to the use of the transmitter.
  • PUSC Partial Usage Sub-Channel
  • a digital predistorter can be designed using a transmitter that is not used during this period.
  • the predistorter can be designed after temporarily setting only a single transmitting antenna.
  • FIG. 2 shows a MIO transmission system including an envelope detector according to the present invention.
  • the MIO transmission system 200 including the envelope detector according to the present invention includes a first transmitter 210, a second transmitter 220, an attenuator 230, a feedback path unit 240, and the like.
  • the adaptive algorithm transition unit 250 is provided.
  • the first transmitter 210 converts the signal distorted by the first predistorter 211 and the first predistorter 211 to predistort the baseband first digital transmission data x 1 (n).
  • the second transmitter 220 converts the signals distorted by the second predistorter 221 and the second predistorter 221 to predistort the baseband second digital transmission data x 2 (n).
  • a plurality of second digital-to-analog converters 222 for converting to a second modulator 223 for modulating the converted analog signal y 2 (t) and outputs of the second modulator 223 (y R2 (t))
  • a second power amplifier 224 for amplifying a second transmission signal a R2 (t) and a second antenna 225 for transmitting the second transmission signal a R2 (t) to the outside. .
  • the attenuator 230 attenuates the magnitude of the first transmission signal a R1 (t) and transmits the first attenuator 231 and the second transmission signal a R2 (t) to the feedback path unit 240.
  • a second attenuator 232 that attenuates the size and transmits it to the feedback path unit 240.
  • the feedback path unit 240 includes a first selector 241, a second selector 242, a difference signal generator 243, an envelope detector 244, and an analog-digital converter 245.
  • the first selector 241 outputs the first modulated signal y R1 (t) output from the first modulator 213 and the second modulated output from the second modulator 223 in response to the first selection signal SEL1.
  • One modulation signal Gx (t) is selected from the signals y R2 (t).
  • the second selector 242 selects one of the first transmission signal a R1 (t) and the second transmission signal a R2 (t) in response to the second selection signal SEL2, or
  • One output signal G'x (t) is selected from the output signal of the first attenuator 231 and the output signal of the second attenuator 232.
  • the first selection signal SEL1 and the second selection signal SEL2 are generated and provided by a controller (not shown) that controls the system 200.
  • the difference signal generator 243 generates an error signal e (t) which is a difference between the signals output from the first selector 241 and the second selector 242.
  • the envelope detector 244 detects an envelope of an error signal and generates an envelope signal z (t).
  • the analog-to-digital converter 245 converts the envelope signal z (t) into a digital signal to generate a digital error signal z (n).
  • the adaptive algorithm transition unit 250 uses the first digital transmission data x 1 (n), the second digital transmission data x 2 (n) and the digital error signal z (n) to perform first predistortion.
  • a first control signal CON1 and a second control signal CON2 used to set the power generator 211 and the second predistorter 221 are generated.
  • the first control signal CON1 and the second control signal CON2 correspond to a zero difference between the baseband digital transmission data x (n) and the transmission signal a R (t). It adjusts the input / output characteristics of the predistorters 211 and 221, and has information for distorting the baseband digital transmission data x (n) in advance, which is not proposed by the present invention and is generally known. Therefore, it will not be described in detail here.
  • 3 shows the signal flow of the MIO transmission system when designing the predistorter included in the first transmitter.
  • FIG 4 shows the signal flow of the MIO transmission system when designing the predistorter included in the second transmitter.
  • the design of the predistorter is started by applying the same baseband digital transmission data x (n) to a transmitter that is used for signal transmission and a transmitter that is not used. .
  • the adaptive algorithm implementing unit 250 includes a PD design unit 251 and a PA recognition unit 252, which are used to design the predistorter 211 included in the first transmitter 210 and the second transmitter 220.
  • the roles in designing the predistorter 221 included in the are different as described below.
  • the PD design unit 251 when designing the predistorter 211 included in the first transmitter 210, the PD design unit 251 may be configured from the first predistorter 211 and the second predistorter 221.
  • the first control signal CON1 is generated using the output predistortion signal, and the PA recognition unit 252 uses the digital transmission data x (n) and the digital error signal z (n).
  • the control signal CON2 is generated.
  • the PD design unit 251 when designing the predistorter 221 included in the second transmitter 220, the PD design unit 251 may be configured from the first predistorter 211 and the second predistorter 221.
  • the first control signal CON1 is generated using the output predistortion signal, and the PA recognition unit 252 uses the digital transmission data x (n) and the digital error signal z (n).
  • the control signal CON2 is generated.
  • the second selector 242 selects the first transmission signal a R1 (t) generated from the power amplifier 214 included in the first transmitter 210, and the first selector 241 selects the second transmitter 220. Selects a second modulated signal y R2 (t).
  • the second selector 242 selects the second transmission signal a R2 (t) generated from the power amplifier 224 included in the second transmitter 220, and the first selector 241 selects the first transmitter 210. Selects the first modulated signal y R1 (t) generated by
  • FIG. 5 is a signal flow diagram of a design method of a predistorter constituting a MIO transmission system according to the present invention.
  • the design method 500 of the predistorter constituting the MIO transmission system is a design of a predistorter used to compensate for distortion of a transmission signal output from the MIO transmission system 200 shown in FIG. 2.
  • a transmitter selection step 510, a training signal input step 520, an error signal generation step 530, an envelope signal detection step 540, a digital error signal generation step 550, and a control signal generation step 560 includes.
  • the transmitter selection step 510 is performed by one of the transmitters currently being used for data transmission, and among the transmitters which are not in use according to a predetermined schedule in relation to the communication specification or the use of the transmitters among the plurality of transmitters or in the transmission mode. Therefore, select one transmitter from among the disabled transmitters.
  • the training signal input step 520 applies the same baseband digital transmission data x (n) to the first transmitter 210 and the second transmitter 220.
  • the error signal generation step 530 generates the error signal, which is a difference signal between a signal attenuated by a transmission signal output from a transmitter to design a predistorter and a modulation signal of the other transmitter. If the predistorter 211 included in the first transmitter 210 is to be designed, the first transmitter signal a R1 (t) and the second transmitter 220 output from the first transmitter 210 may be used. The difference signal of the generated second modulated signal y R2 (t) will be generated. On the contrary, when the predistorter 221 included in the second transmitter 220 is to be designed, the second transmitter signal a R2 (t) and the first transmitter 210 output from the second transmitter 220 may be used. The difference signal of the generated first modulated signal y R1 (t) will be generated.
  • the envelope signal detecting step 540 detects an envelope signal that is an envelope of an error signal.
  • the digital error signal generation step 550 converts an envelope signal in an analog state into a digital signal to generate a digital error signal z (n).
  • the control signal generation step 560 generates two control signals CON1 and CON2 using the digital transmission data x (n) and the digital error signal z (n), respectively.
  • the same baseband signal may be applied to the first transmitter 210 and the second transmitter 220.
  • x (n)) is applied.
  • the power amplifier 214 constituting the first transmitter 210 will output an RF signal distorted by the nonlinear characteristic of the power amplifier 214, that is, the first transmission signal a R1 (t). . Since the same baseband signal x (n) as that applied to the first transmitter 210 is applied, the input of the power amplifier 224 constituting the second transmitter 220, that is, the output from the second modulator 223 The second modulated signal y R2 (t) may be the same as the signal applied to the input of the power amplifier 214 constituting the first transmitter 210.
  • the power of the first transmission signal a R1 (t) output from the first transmitter 210 is amplified by the power amplifier 214 and is very high, the power of the second modulated signal y R2 (t) is increased. After attenuating to be equal to, an error signal e (t) is generated that is a difference between the attenuated first transmission signal a R1 (t) and the second modulated signal y R2 (t).
  • the magnitude of the error signal e (t) is measured using the envelope detector 244 (z (t)), and the measured result is converted into a digital error signal z (n) through the analog-to-digital converter 245. After the conversion, it is transmitted to the adaptive algorithm transition unit 250.
  • the output signals of the digital analog converters 212 and 222 included in the first transmitter 210 and the second transmitter 220 may be expressed by Equation 1 below. Since the output signal of the digital-to-analog converters 212 and 222 is an analog signal, the display should be distinguished from the digital signal, but this can be overcome by the conversion of the signal processing domain. use.
  • y 1 is an output signal of the digital analog converter 212 included in the first transmitter 210
  • y 2 is an output signal of the digital analog converter 222 included in the second transmitter 220.
  • F 2 (o) which is a function of the predistorter 221 included in the second transmitter 220, is a virtual power amplifier for modeling the baseband characteristics of the power amplifier 214 constituting the first transmitter 210. use.
  • Equation 2 If the signals shown in Equation 1 are up-converted to RF, it may be expressed as Equation 2.
  • the subscript R means an RF signal
  • the signal without R means a baseband signal
  • the first transmission signal a R1 (t) models the nonlinear characteristic of the power amplifier 214 as an arbitrary fifth-order polynomial function, G R ( ⁇ ), and substitutes Equation 2 into G R ( ⁇ ). Considering only the signal components around the carrier wave (carrier wave) can be expressed as shown in equation (3).
  • ⁇ is the coefficient.
  • the fifth order polynomial model is applied for convenience of explanation, and the derivation process is equally applicable to polynomials or Volterra models having arbitrary orders (L and L are natural numbers).
  • a (t) is a baseband signal distorted by the baseband equivalent function of the power amplifier 214 and can be expressed as Equation (4).
  • the envelope signal z (t) detected from the signals that can be expressed by the above equation can be expressed as shown in equation (5).
  • Equation 5 G (x (t)) / K is the same as the feedback signal obtained in the conventional feedback circuit, that is, the signal having the equivalent characteristic of the baseband of the power amplifier. Therefore, when the envelope of the error signal is detected, the magnitude of the error between the baseband signal down-converting the output signal of the power amplifier and the undistorted or intentionally distorted baseband signal can be obtained.
  • the information included in the error signal is the same as the error obtained through the conventional feedback circuit, but the phase information is removed. If the magnitude of this error is zero, the virtual power amplifier model will match the baseband model of the actual power amplifier, so we can construct an algorithm to find the model of F 2 (o) to minimize the magnitude of this error. If possible, the baseband characteristics of the power amplifier can be obtained and used to design a predistorter that linearizes the power amplifier.
  • FIG. 6 is a more simplified block diagram of the problem of power amplifier model estimation.
  • an envelope of a difference signal e (n) between a signal Gx (n) selected by the first selector 241 and a signal G′x (n) selected by the second selector 242. is to detect (z (n)).
  • (x (n)) is baseband digital transmission data.
  • Equation 6 a model of the virtual power amplifier is assumed to be a polynomial model shown in Equation 6 for the convenience of algorithm description.
  • the digital error signal z (n) obtained by digitally converting the output signal z (t) of the envelope detector 244 can be expressed as in Equation (7).
  • T is the sampling period of the analog-to-digital converter
  • / x and / d are vectors
  • the coefficient (di) of the square-error polynomial model of Equation (8) is Can be displayed together.
  • bar (bar) at the top of the variable all means a vector.
  • Coefficients of the square-error polynomial model shown in Equation 9 may be obtained as shown in Equations 10 and 11 using N inputs (N is a natural number).
  • Equation 12 when the input signal matrix and the square-error vector are constructed from the input signal and the error signal, the square-error polynomial coefficient is obtained as shown in Equation 12 when the least square method is applied. .
  • the coefficient of the polynomial model of the square-error signal obtained using the feedback envelope signal as described above is a polynomial composed of the error between the actual power amplifier characteristics and the current coefficient of F 2 (o). Therefore, when the polynomial model coefficients of the square-error signal are first obtained, information on the difference between the coefficients of the real power amplifier and the virtual power amplifier F 2 (o) can be obtained.
  • each model coefficient can be estimated relatively simply.
  • the coefficients of the virtual power amplifier are all set to 0, and then N input and feedback samples are collected to estimate the coefficient of the square-error polynomial.
  • Step 2 estimate the w 1 coefficient
  • the phase value ⁇ 1 has two solutions. Therefore, at this stage, the phase of the coefficient w 1 can not be determined yet, so the estimated value of w 1 is first set to one of two values, and the coefficient of the square-error polynomial is estimated again to obtain d 1 (Fig. 7 (c)). ), and then re-set the estimated value of w 1 in a different candidate values back to the square-estimating the coefficients of the error polynomial is obtained by d 1 (Fig. 7 (d)), and finally w a candidate for obtaining a minimal coefficient d 1 1 Decide on The second written subscript of the coefficient w indicates the order of estimation.
  • Step 3 estimate the w 2 , w 3 coefficients
  • the model estimation is completed so that the model of the virtual power amplifier becomes the baseband model of the actual power amplifier through this process, the output signal of the virtual power amplifier becomes the same as the feedback signal of the conventional downconversion method. Therefore, since the conventional predistortion apparatus design techniques can be arbitrarily applied, the description thereof is not described here.
  • the MIO transmission system is characterized by obtaining the measurement value for the nonlinear distortion of the power amplifier in RF, and the predistorter design using this method using the virtual power amplifier model estimation described in detail above
  • the method of designing the predistorter using the output of this virtual power amplifier using the output of this virtual power amplifier can also be applied by minimizing the amount of distortion measured by changing the coefficient of F2 (o) to an arbitrary value. Do.
  • the gist of the invention is described using an example of the fifth order polynomial, but the model order of the power amplifier to be actually applied may be any order, and the coefficient of the predistorter or the virtual power amplifier may be changed to an arbitrary value. It is not necessary to use a polynomial model when using a technique that minimizes distortion while changing. In other words, it can be applied to any model previously used for power amplifier modeling such as Volterra model, memory polynomial model, or look-up table model.
  • the output signal of the virtual power amplifier can be used instead of the actual feedback signal obtained from the conventional predistorter method.
  • Predistorter design technique using signal can be applied arbitrarily.

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Abstract

La présente invention porte sur un système d'émission MIMO comprenant un détecteur d'enveloppe qui obtient des informations de distorsion d'un amplificateur de puissance avec un détecteur d'enveloppe, qui peut être implémenté d'une manière simple, ce qui permet de réduire au minimum le coût d'implémentation d'un chemin de rétroaction, et sur un procédé de conception d'un dispositif de prédistorsion constituant un système d'émission MIMO qui conçoit le dispositif de prédistorsion inclus dans le système d'émission MIMO. Le système MIMO comprend : un premier émetteur ; un second émetteur ; une unité de chemin de rétroaction ; et une unité d'implémentation d'algorithme d'adaptation. Le procédé de conception d'un dispositif de prédistorsion constituant le système d'émission MIMO est utilisé pour compenser la distorsion d'un signal d'émission délivré par le système d'émission MIMO décrit dans la revendication 4, et le procédé comprend les étapes consistant à : introduire un signal d'apprentissage ; générer un signal d'erreur ; détecter un signal d'enveloppe ; générer un signal d'erreur numérique ; et générer un signal de commande.
PCT/KR2014/001942 2013-04-16 2014-03-10 Système d'émission mimo comprenant un détecteur d'enveloppe et procédé de conception de dispositif de prédistorsion constituant un système d'émission mimo WO2014171632A1 (fr)

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