WO2003103164A1 - 適応制御装置 - Google Patents
適応制御装置 Download PDFInfo
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- WO2003103164A1 WO2003103164A1 PCT/JP2002/005324 JP0205324W WO03103164A1 WO 2003103164 A1 WO2003103164 A1 WO 2003103164A1 JP 0205324 W JP0205324 W JP 0205324W WO 03103164 A1 WO03103164 A1 WO 03103164A1
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- delay time
- unit
- signal
- delay
- adaptive control
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Classifications
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- 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
-
- 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
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
-
- 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
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
- H03F1/345—Negative-feedback-circuit arrangements with or without positive feedback using hybrid or directional couplers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
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- 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
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/045—Circuits with power amplifiers with means for improving efficiency
Definitions
- the present invention relates to an adaptive control device, and more particularly to an adaptive control device having a function of adjusting a delay time so that a delay time between a reference signal and a feed pack signal becomes zero.
- a device that performs adaptive control using a feedback signal calculates the difference between a reference signal and a feedback signal, performs adaptive control so that the difference is reduced, and outputs the reference signal reflecting the result of the adaptive control.
- FIG. 19 is a configuration diagram of the adaptive control device 1 for compensating for distortion generated in the power amplifier.
- the error calculation calculates the difference between the transmission signal x (t), which is the reference signal, and the feedpack signal y (t).
- Section 1a delay sections lb and lc that delay each signal so that the delay time between the reference signal and the feedback signal becomes zero, and also refer to adaptive control so that the difference e (t) becomes small.
- An adaptive control unit id for reflecting an adaptive control result in a signal is provided.
- Id inputs the signal obtained by reflecting the adaptive control result to the reference signal to the modulation unit 2, the modulation unit 2 modulates the input signal, and the DA converter 3 analyzes the modulated signal.
- the input signal is converted to a power signal and input to the power amplifier 4.
- the power amplifier 4 amplifies the input signal and radiates it to the space from the antenna 5.
- the directional coupler 6 takes out a part of the output of the power amplifier and inputs it to the demodulation unit 8 via the AD converter 7.
- the demodulation unit 8 performs demodulation processing on the input signal and inputs the signal to the adaptive control device 1.
- the error calculation unit 1a calculates a difference e (t) between the reference signal ⁇ ′ (t) input via the delay units lb and lc and the feedback signal y ′ (t), and the adaptive control unit Id calculates the difference e (t).
- Adaptive control is performed so that (t) becomes small, and the adaptive control result is reflected on the next reference signal.
- the feedback signal can be matched with the distortion-free reference signal. That is, distortion generated in the power amplifier 4 can be compensated, and a signal without distortion can be transmitted.
- FIG. 20 is an explanatory diagram of the operation of the adaptive control unit.
- the adaptive control unit includes a reflection unit 11 for reflecting the adaptive control result on the reference signal x (t) and outputting the result, and an adaptive control operation unit 12.
- a multiplier (Purideisu Toshiyon portion) 11 a outputs a distortion compensation coefficient h n (p) the multiplication to the multiplication result to the transmission signal X (t).
- the distortion compensation coefficient h n + i (p) obtained by the LMS adaptive algorithm of the adaptive control operation unit 12 compensates for the distortion.
- the delay unit lid generates the write address Aw of the distortion compensation coefficient storage unit lib. It takes a predetermined time until the distortion compensation coefficient hn (p) is read from the address AR indicated by the power p of the transmission signal X (t) and a new distortion compensation coefficient hn + 1 (p) is obtained. Therefore, the delay unit lid delays the generation of the write address by this time so that the old distortion compensation coefficient h n (p) can be updated with the new distortion compensation coefficient 1 ⁇ ⁇ + 1 ( ⁇ ).
- the multiplier 12a multiplies the difference signal e (t) between the transmission signal X ′ (t) and the feedback signal ′ (t) by the step size parameter ⁇ ( ⁇ 1), and
- the signal output unit 12b outputs a conjugate complex signal y * (t).
- the multiplier 12c performs multiplication of the distortion compensation coefficient h n (p) and y * (t), a multiplier 12d is; for multiplying ue (t) and u * (t).
- Delay unit 12e adjusts the tie Mi ring for outputting a distortion compensation coefficient h n (p), the adder 12f adds the distortion compensation coefficient h n (p) and / e (t) u * ( t), new And outputs the distortion compensation coefficient h n +1 (p).
- the power amplifier 4 has a distortion function f (p).
- x, y, f, h, u, and e are complex numbers, and * is a conjugate complex number.
- the distortion compensation coefficient h n (p) is updated, and finally converges to the optimal distortion compensation coefficient value, and the distortion of the power amplifier 4 is compensated.
- a delay time control unit 9 is provided to control the delay time of the delay unit 1c so as to control the reference signal and the feedback signal.
- the timing input to the error calculation section la of the signal is matched. That is, while changing the delay time of the feed pack signal, the delay time control unit 9 calculates the correlation between the reference signal output from the delay unit lb and the feed pack signal output from the delay unit lc in the correlator 9a, and calculates the delay time.
- the setting unit 9b finds the delay time at which the correlation becomes maximum, and sets the delay time in the delay unit lc. As a result, the delay time between when the reference signal x (t) is input to the adaptive control device 1 and reaches the error calculation unit la and the time when the feedback signal y (t) reaches the error calculation unit la are calculated. Delay time can be equalized.
- the delay time of the feedback signal changes depending on the frequency band and bandwidth of the reference signal. Therefore, there is no problem if the frequency component of the reference signal is constant.However, if the frequency component changes, the delay time until the reference signal x (t) reaches the error calculation unit la and the feedback signal y The delay time until (t) reaches the error calculation section la becomes unequal, and adaptive control cannot be performed well. For example, when the distortion compensation of the power amplifier is performed by adaptive control, the noise compensation coefficient does not converge optimally and the noise floor rises. Even when the delay time control section 9 performs the delay time control in real time, the delay time control cannot follow the frequency change and can be controlled at a high speed, and the above problem occurs.
- the number of carriers and the carrier arrangement fluctuate depending on the presence or absence of each transmission signal.
- the above problem occurs due to a change in the delay time of the feedback signal.
- the delay time of the feedback signal changes depending on the power of each carrier signal and the temperature of the device, and the above problem occurs.
- an object of the present invention is to provide a delay time until a reference signal x (t) reaches an error calculation unit and a feedback signal y (t) even when a frequency component of a reference signal changes. Is to make the delay time until the signal arrives at the error calculation unit equal, thereby enabling adaptive control to be performed satisfactorily.
- Another object of the present invention is that even if the number of carriers and the arrangement of the carriers fluctuate, the delay time until the reference signal x (t) reaches the error calculation unit and the feed pack signal y (t) are calculated by the error calculation. The reason is that the delay time until the signal reaches the section can be made equal, and thereby adaptive control can be performed satisfactorily.
- Another object of the present invention is to provide a delay time for the reference signal x (t) to reach the error calculation unit even when the power of each carrier signal or the temperature inside the device changes in multicarrier transmission, The delay time required for the feedback signal y (t) to reach the error calculation unit can be made equal, whereby adaptive control can be performed well.
- Another object of the present invention is to provide a delay time until the reference signal x (t) reaches the error calculation unit and a feedback signal y (t) to the error calculation unit even when the carrier frequency changes.
- the delay time until arrival can be made equal, and thereby adaptive control can be performed well.
- the present invention relates to an adaptive control device that calculates a difference between a reference signal and a feedback signal, performs adaptive control so as to reduce the difference, and outputs a reference signal reflecting an adaptive control result.
- the first adaptive control device has the following features: (1) at least one signal is set so that the reference signal and the feedback signal are simultaneously input to a calculation unit (error calculation unit) that calculates the difference; A delay unit that delays by the delay time, (1) a frequency component detection unit that detects the frequency component of the reference signal, (3) a delay time acquisition unit that acquires the delay time based on the frequency component, (4) the acquired delay time A delay time setting unit configured to set the delay unit.
- this adaptive control device even when the frequency component of the reference signal changes, the reference signal and the build-pack signal can simultaneously reach the error calculation unit, and adaptive control can be performed satisfactorily. it can.
- the second adaptive control device of the present invention includes: (1) a delay unit that delays at least one signal by a set delay time so that the reference signal and the feedback signal are simultaneously input to the error calculation unit; If the reference signal is a multi-carrier signal, a delay time acquisition unit that acquires the delay time based on the number of carriers and a carrier arrangement; (3) a delay time setting unit that sets the acquired delay time in the delay unit; It has. According to this adaptive control device, even if the number of carriers and the arrangement of the carriers fluctuate, the delay time until the reference signal reaches the error calculation unit and the delay time until the feedback signal reaches the error calculation unit. The delay time can be made equal, and thereby adaptive control can be performed well.
- the number of carriers of the multi-carrier signal which is the reference signal
- the arrangement of the carriers If the delay time is acquired based on each carrier signal power and set in the delay unit, even if the number of carriers, the carrier arrangement, and the power are changed, the reference is performed.
- the delay time required for the signal to reach the error calculation unit and the delay time required for the feedback signal to reach the error calculation unit can be made equal, whereby adaptive control can be favorably performed.
- the delay time is acquired based on the number of carriers of the multicarrier signal as a reference signal and the arrangement of the carriers and the temperature in the device and set in the delay section, the number of carriers and the number of carriers are obtained. Even when the rear arrangement and the internal temperature change, the delay time until the reference signal reaches the error calculation unit and the delay time until the feedback signal reaches the error calculation unit can be made equal. This makes it possible to perform adaptive control well.
- the third adaptive control device of the present invention includes: (1) a delay unit that delays at least one signal by a set delay time so that the reference signal and the feed pack signal are simultaneously input to the error calculation unit; (2) When the reference signal on which the adaptive control result is reflected is carried by a carrier having a predetermined frequency, a delay time acquiring unit that acquires the delay time based on the carrier frequency; And a delay time setting unit for setting the delay time. According to this adaptive control device, even when the carrier frequency changes, the delay time until the reference signal reaches the difference calculation unit and the delay time until the feedpack signal reaches the difference calculation unit. Can be made equal, and thereby adaptive control can be performed well.
- the fourth adaptive control device includes: (1) a delay time difference detection unit that measures a difference in delay time until a reference signal and a feed pack signal are input to an error calculation unit by changing the frequency of the reference signal; A delay time difference characteristic creation unit that creates a delay time difference characteristic with respect to a signal frequency; (3) a complex filter that applies a predetermined filtering process to the feedback signal and inputs the result to an error calculation unit; A coefficient determining unit that determines a complex filter coefficient and sets the complex filter in the complex filter. According to this adaptive control device, even when the frequency component of the reference signal changes, the reference signal and the feed pack signal can simultaneously reach the difference calculation unit, and adaptive control can be performed well. BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is a configuration diagram of the adaptive control device according to the first embodiment.
- FIG. 2 is a diagram illustrating the principle of creating a delay time table.
- FIG. 3 is a configuration diagram of the adaptive control device according to the second embodiment.
- FIG. 4 is an explanatory diagram of the third embodiment.
- FIG. 5 is a configuration diagram of the adaptive control device of the third embodiment.
- Figure 6 shows the other delay time characteristics based on the center frequency specified by the number of carriers and the carrier arrangement.
- FIG. 7 is a configuration diagram of the fourth embodiment.
- FIG. 8 is a characteristic curve showing the relationship between power and delay amount.
- FIG. 9 shows the power ratio delay amount change ratio characteristics.
- FIG. 10 is a configuration diagram of the adaptive control device according to the fifth embodiment.
- FIG. 11 is an explanatory diagram showing the relationship between the internal temperature and the delay amount.
- FIG. 12 is a characteristic curve showing the relationship between the actually measured internal temperature and the delay amount.
- FIG. 13 is a configuration diagram of the adaptive control device of the sixth embodiment.
- Figure 14 shows the relationship between carrier frequency and delay time.
- FIG. 15 is a configuration diagram of the adaptive control device of the seventh embodiment.
- FIG. 16 is a configuration diagram of the adaptive control device according to the eighth embodiment.
- FIG. 17 is a configuration diagram of a complex filter.
- FIG. 18 is an explanatory diagram of the eighth embodiment.
- FIG. 19 is a configuration diagram of an adaptive control device for compensating for distortion generated in a power amplifier.
- FIG. 20 is an explanatory diagram of the operation of the adaptive control unit.
- FIG. 21 is a configuration diagram of the conventional delay time adjustment.
- FIG. 1 is a configuration diagram of the adaptive control device of the first embodiment, and is an example applied to a case where distortion of a power amplifier is compensated.
- the adaptive controller 51 transmits the reference signal, the transmission signal x (t) and the feed pack signal y (t). Error calculators 51a and 51c for calculating the difference between the reference signal and the feed pack signal input to the error calculator 51a, and delaying each signal so that the delay time difference becomes zero.
- the adaptive control section 51d and the delay section 51c that control the adaptive control so that the difference e (t) becomes small and reflect the adaptive control result in the reference signal control the reference signal and the feed pack signal. At the same time, it has a delay time control section 51e for controlling input to the error calculation section 51a.
- the delay unit 51c shifts the digital feedback packet y (t) arriving at the clock cycle and sequentially stores the shift register 61, and receives the transmission signal from a predetermined shift position of the shift register 61. And a second selector 63 for extracting a transmission signal from a predetermined shift position of the shift register 61 and inputting the signal to a correlator of the delay time control unit 51e. are doing.
- the second selector 63 controls the delay time difference with respect to the transmission signal by switching the position of the shift register 61 for extracting the feed pack signal y (t).
- the shift length of shift register 61 is determined so as to be longer than the maximum delay time between the reference signal and the built-in pack signal, and the feedback signal is m'T (m'T (m) at the m-th shift position from the top. T is the clock cycle).
- the delay time control unit 51e includes a frequency detection unit 71, a delay time table storage unit 72, a delay time acquisition unit 73, a delay time setting unit 74, and a sliding correlator 75.
- the frequency detection unit 71 is configured by an FFT or the like, and detects a frequency component of the reference signal x (t).
- the delay time table storage unit 72 stores the difference between the delay times until the reference signal and the feed pack signal are input to the error calculation unit 51a, corresponding to the reference signal frequency.
- the difference in the delay time between the input of the reference signal and the feed pack signal to the error calculator 51a varies depending on the frequency component (frequency, bandwidth, etc.) of the reference signal.
- the delay time difference is registered in the delay time table storage unit 72 in correspondence with the reference signal frequency.
- the delay time acquisition unit 73 acquires the delay time difference based on the frequency component of the reference signal from the delay time table storage unit 72 and inputs the acquired delay time difference to the delay time setting unit 74.
- the delay time setting unit 74 initializes the delay time input from the delay time acquisition unit 73 in the first selector 62 of the delay unit 51c.
- the delay time setting unit 74 calculates the delay By controlling the second selector 63 of the extension unit 51c, the shift position of the shift register 61 for extracting the feedback signal y (t) is switched, and the delay time of the feed pack signal is changed. Then, the correlation value calculated by the sliding correlator 75 at each delay time is stored, a delay time at which the correlation value is maximized is determined, and this delay time is reset to the first selector 63 of the delay unit 51c.
- the sliding correlator 75 multiplies, by one clock, the transmission signal delayed by a predetermined time and the feedback signal output from the delay section 51c, and accumulates the multiplication result to calculate the correlation between the two signals.
- a 1-clock delay unit 75b, and an adder 75c that adds the integrated value up to that and the current multiplication result and outputs the result.
- adaptive control section 51d When a transmission signal is input, adaptive control section 51d inputs a signal obtained by reflecting the adaptive control result on reference signal x (t) to modulation section 52, and modulation section 52 converts the signal to an input signal.
- the DA converter 53 converts the modulated signal into an analog signal and inputs the analog signal to the power amplifier 54.
- the power amplifier 54 amplifies the input signal and radiates it to the space from the antenna 55.
- the directional coupler 56 extracts a part of the output of the power amplifier and inputs it to the demodulation unit 58 via the AD converter 57.
- the demodulation unit 58 demodulates the input signal and inputs the signal to the adaptive control device 51.
- the frequency detection unit 71 detects the frequency component of the reference signal, and the delay time acquisition unit 73 obtains a delay time corresponding to the frequency component of the reference signal from the delay time table storage unit 72.
- the delay time setting unit 74 initially sets the delay time input from the delay time acquisition unit 73 in the first selector 62 of the delay unit 51c.
- the feedback signal y (t) is delayed by the delay time set in the delay unit 51c, and the total delay time of the feed pack signal is obtained by calculating the error of the reference signal x (t) through the delay unit 51. This is approximately equal to the total delay time required to reach part 51a.
- the error calculator 51a calculates the difference e (t) between the reference signal x '(t) input via the delay units 51b and 51c and the feedback signal (t), and the adaptive controller 51d calculates the difference e (t ) Is reduced so that the adaptive control result is reflected in the next reference signal. Thereafter, the above operation is repeated.
- the delay time between the reference signal and the feedback signal can be made equal, so that good adaptive control becomes possible, and the distortion of the power amplifier can be well compensated. it can.
- the delay time setting unit 74 controls the second selector 63 of the delay unit 51c to determine the shift position of the shift register 61 for extracting the feedback signal y (t) in order to obtain the maximum correlation. Switch, which changes the delay time of the feed pack signal. Then, the delay time setting unit 74 stores the correlation value calculated by the sliding correlator 75 at each delay time, finds the delay time at which the correlation value becomes maximum, and uses this delay time as the first selector 63 of the delay unit 51c. Reset to.
- the shift range for obtaining the maximum correlation may be a small range before and after the initially set delay time. This allows the delay time of the delay unit 51c to be quickly and fine-tuned to the real time to provide the feedback signal and the reference signal. Thus, the arrival times at the error calculation unit can be matched with high accuracy, and good adaptive control can be performed.
- FIG. 2 is a diagram for explaining the principle of creating a delay time table.
- the signal band of the device is FA of fo ⁇ as shown in Fig. 2 (A).
- Figure 2 is the center frequency bandwidth FB shown in (B) input to the device successively larger training signals to fo ⁇ f 3, the delay time difference which the correlation value is maximized with respect to each Re their Re of training signals
- the frequency-delay characteristics shown in Fig. 2 (C) can be obtained.
- the training signal uses a signal narrower than the signal band of the equipment, and FA ⁇ FB holds if the equipment signal band is FA and the training signal band is FB.
- FIG. 3 is a configuration diagram of the adaptive control device of the second embodiment, and the same components as those of the first embodiment of FIG. 1 are denoted by the same reference numerals. The difference is that a configuration for creating a delay time table, such as the communication control unit 59, the switch 60, and the delay time table creating unit 76, has been added.
- the delay unit 51c has the same configuration as the delay unit 51c in FIG.
- a delay time table Prior to transmitting a transmission signal, a delay time table is created.
- the communication control unit 59 controls the switch 60 to select the training Shingo, and controls the delay time. Instructs the control unit 51e to create a delay time table. Next, the communication control unit 59 generates a first training signal of the center frequency fo, and inputs the center frequency fo to the delay time table creation unit 76.
- the delay time setting unit 74 controls the second selector 63 (see FIG. 1) of the delay unit 51c to obtain the maximum correlation, and the shift position of the shift register 61 for extracting the feedback signal y (t). To change the delay time of the feed pack signal. Then, the delay time setting unit 74 stores the correlation value calculated by the correlator 75 for each delay time, finds the delay time at which the correlation value becomes maximum, and inputs this delay time to the delay time tape creation unit 76. I do. The delay time table creation unit 76 stores the input delay time in association with the center frequency fo.
- the communication control unit 59 generates a sea urchin narrowband training signal by sequentially increasing the frequency to f 3, the delay time table creation unit 76 so as to correspond to the frequency of the delay time obtained in the same manner
- the communication control section 59 causes the switch to select a transmission signal.
- delay time control and adaptive control are performed in the same manner as in the first embodiment.
- the correspondence between the reference signal frequency and the delay time is tabulated, and the delay time is obtained from the table and set in the delay unit. Can be stored, linearized between them and expressed by a linear equation, and the delay time can be calculated and set in the delay section.
- FIG. 4 is an explanatory view of the third embodiment, in which the center frequency of the training signal is changed to f0, 0, and f3, and at this center frequency, the delay time (delay amount) of the feedpack signal is obtained and stored. I do. Then, two linear equations (Ao X frq + Bo, AX frq + B i) of the center frequency and the delay amount are generated using the obtained three sets of center frequency and the delay amount, and the reference signal frequency is changed. Then, a delay amount corresponding to the reference signal frequency is obtained from a predetermined equation and set in the delay unit.
- FIG. 5 is a configuration diagram of the adaptive control device according to the third embodiment, and the same components as those in the first embodiment in FIG. The difference from the first embodiment is that a delay time calculator 77 is provided to calculate the delay time by calculation. Note that prior to transmitting the transmission signal Then, a training signal is input by the method shown in FIG. 3, delay amounts corresponding to some frequencies are obtained, and input to the delay time calculation unit 77.
- adaptive control section 51d inputs a signal obtained by reflecting the adaptive control result on reference signal x (t) to modulation section 52, and modulation section 52
- the input signal is modulated
- the DA converter 53 converts the modulated signal into an analog signal and inputs it to the power amplifier 54
- the power amplifier 54 amplifies the input signal and radiates it to the space from the antenna 55.
- the directional coupler 56 extracts a part of the output of the power amplifier and inputs it to the demodulation unit 58 via the AD converter 57.
- the demodulation unit 58 demodulates the input signal and inputs the demodulated signal to the adaptive control device 51.
- the frequency detecting section 71 detects the frequency component of the reference signal and inputs it to the delay time calculating section 77.
- the delay time calculation unit 77 calculates the delay time using a linear equation according to the range to which the frequency component of the reference signal belongs, and inputs the delay time to the delay time setting unit 74.
- the delay time setting unit 74 initializes the delay time input from the delay time calculation unit 77 in the first selector 62 of the delay unit 51c.
- the feedback signal y (t) is delayed by the delay unit 51c by the set delay time, and the total delay time of the feed pack signal is reduced by the reference signal x (t) via the delay unit 51b. This is approximately equal to the total delay time required to reach the error calculation section 51a.
- the error calculator 51a calculates the difference e (t) between the reference signal (t) input through the delay unit 51 51 and the feed pack signal (t), and the adaptive controller Id calculates the difference e (t). Adaptive control is performed so that it becomes smaller, and the result of adaptive control is reflected in the next reference signal. Thereafter, the above operation is repeated. By the above control, the delay time of the reference signal and the feed pack signal can be equalized, and good adaptive control can be performed.
- the delay time setting section 74 controls the second selector 63 (see FIG. 1) of the delay section 51c to obtain the feedback signal y (t) to obtain the maximum correlation.
- the shift position of the signal is switched, thereby changing the delay time of the feed pack signal.
- the delay time setting unit 74 stores the correlation value calculated by the sliding correlator 75 at each delay time, obtains the delay time at which the correlation value becomes maximum, and uses this delay time as the first selector of the delay unit 51c. Reset to 63.
- the shift range for obtaining the maximum correlation may be a small range before and after the initially set delay time.
- transmission is performed using a single carrier, and transmission may be performed using a force multicarrier signal.
- the delay time of the feedpack signal y (t) changes according to the number of carriers (corresponding to the used bandwidth) and the center frequency specified by the carrier arrangement. . Therefore, in the fourth embodiment, the delay time is measured in advance in accordance with a combination of the number of carriers and the carrier arrangement, or the center frequency, and the measured delay time is registered in the delay time table storage unit. The delay time corresponding to the combination of the carrier arrangement and the center frequency is obtained from the table and set in the delay unit.
- FIG. 7 is a configuration diagram of the fourth embodiment, and the same parts as those in the first embodiment of FIG. 1 are denoted by the same reference numerals. The difference from the first embodiment is that
- the delay time table that stores the delay time corresponding to the combination of the number of carriers and the carrier arrangement or the center frequency specified by the number of carriers and the carrier arrangement is stored in the delay time table storage unit 72. Registered in the
- the delay time obtaining unit 73 obtains the combination of the number of carriers and the carrier arrangement from the communication control unit 59 or the center frequency, obtains the delay time corresponding to these from the delay time table, and delays. Points to be input to the time setting section 74,
- the delay unit 51c has the same configuration as the delay unit 51c in FIG.
- the signal x (t) corresponds to the single carrier transmit signal x (t), Thereafter, the same adaptive control and delay time control as in the case of the single carrier are performed.
- the adaptive control unit 51d inputs the signal obtained by reflecting the adaptive control result on the transmission signal x (t) to the modulation unit 52, and the modulation unit 52 performs a modulation process on the input signal, and performs DA conversion.
- the amplifier 53 converts the modulated signal into an analog signal and inputs the analog signal to the power amplifier 54.
- the power amplifier 54 amplifies the input signal and radiates it to the space from the antenna 55.
- the directional coupler 56 extracts a part of the output of the power amplifier and inputs it to the demodulation unit 58 via the AD converter 57, and the demodulation unit 58 performs demodulation processing on the input signal and inputs it to the adaptive control device 51. .
- the delay time obtaining unit 73 obtains, from the communication control unit 59, a combination of the number of carriers and the carrier arrangement, or the center frequency specified by the number of carriers and the carrier arrangement.
- the delay time acquisition unit 73 acquires the combination of the acquired number of carriers and the carrier arrangement, or the delay time corresponding to the center frequency from the delay time table storage unit 72 and inputs the acquired delay time to the delay time setting unit 74.
- the delay time setting unit 74 initializes the delay time input from the delay time acquisition unit 73 in the first selector 62 (see FIG. 1) of the delay unit 51c.
- the feed pack signal y (t) is delayed by the set delay time in the delay unit 51c and reaches the error calculation unit 51a.
- the total delay time of the feedback signal is substantially equal to the total delay time until the transmission signal x (t), which is the reference signal, reaches the error calculation unit 51a via the delay unit 51b. Equal.
- the error calculation unit 51a calculates the difference e (t) between the reference signal x '(t) input through the delay units 51b and 51c and the feedback signal yr (t), and calculates the adaptive control unit 5a. 1d performs adaptive control so that the difference e (t) becomes small, and reflects the adaptive control result in the next transmission signal. Thereafter, the above operation is repeated. According to the above control, the delay time of the reference signal and the delay time of the feed pack signal can be equalized, so that good adaptive control can be performed.
- the delay time setting unit 74 controls the second selector 63 (see FIG. 1) of the delay unit 51c to obtain the feedback signal y (t) in order to obtain the maximum correlation. 6 Switch the shift position of 1 to change the delay time of the feed pack signal. Then, the delay time setting unit 74 stores the correlation value calculated by the correlator 75 at each delay time, obtains the delay time at which the correlation value becomes maximum, and uses this delay time as the first select time of the delay unit 51c. To 63. The shift range for finding the maximum correlation is the initial setting.
- the delay time of the delay section 51c can be finely adjusted quickly and in real time, and the arrival time of the feed pack signal and the reference signal to the error calculation section can be matched with high accuracy. And good adaptive control becomes possible.
- the delay time is obtained from the table.
- the delay time can be obtained using a calculation formula for calculating the delay time from the number of carriers and the carrier arrangement. For example, the amount of delay corresponding to the center frequency of a multicarrier is obtained discretely, and a calculation formula for calculating the amount of delay from the center frequency is established using these values. The actual number of carriers and the arrangement of carriers are determined. Then, the center frequency is obtained, and the delay amount is calculated using the above formula.
- the delay time of the feedback signal changes depending on the number of carriers and the arrangement of the carriers, and also changes depending on the power of each carrier.
- A is a characteristic curve showing the relationship between the center frequency of the carrier and the delay amount
- B is a characteristic curve showing the relationship between the power and the delay amount.
- Canon Li A number force S is the same, different power (1), (2) delay amount is small Natsute of power delay amount than the high frequency side f 3 Ri by the center frequency is small (2) I have. Therefore, in the fifth embodiment, a first table indicating the combination of the number of carriers and the carrier arrangement, or the delay amount corresponding to the center frequency specified by the combination, is used.
- curve B is the power ratio / delay amount / decrease ratio characteristic of the second table. If the power ratio is r0, the increase / decrease ratio is 1 ⁇ . If the delay time obtained from the first table is ⁇ , then the delay time considering power is (1 ⁇ 1 ⁇ 0). Becomes
- FIG. 10 is a configuration diagram of the adaptive control device according to the fifth embodiment, and the same components as those of the fourth embodiment in FIG. The difference is
- the first and second two tables are registered in the delay time table storage 72.
- a power measuring unit 81 for measuring the power of each carrier is provided.
- the delay time acquisition unit 73 acquires the delay time based on the first and second two points. It is a point to do.
- the delay time obtaining unit 73 obtains the combination of the number of carriers and the carrier arrangement from the communication control unit 59 or the center frequency obtained from the number of carriers and the carrier arrangement, and the delay time ⁇ corresponding to these. From the first table. Next, the delay time acquisition unit 73 calculates the power ratio between the high band power and the low band power based on the power of each carrier, and calculates the delay amount increase / decrease ratio ⁇ according to the power ratio in the second table. ⁇ (1+ ⁇ )
- the delay time in consideration of the power is obtained by the calculation, and set in the delay time setting unit 74.
- the delay time setting unit 74 initializes the delay time input from the delay time acquisition unit 73 in the first selector 62 (see FIG. 1) of the delay unit 51c.
- the feedpack signal y (t) is delayed by the delay unit 51c by the set delay time and reaches the error calculation unit 51a.
- the total delay time of the feedback signal is not substantially equal to the total delay time until the transmission signal x (t), which is the reference signal, reaches the error calculation unit 51a via the delay unit 51b.
- the delay time of the feed pack signal varies depending on the number of carriers and the arrangement of the carriers, and also varies depending on the temperature inside the apparatus.
- A is a characteristic curve showing the relationship between the carrier center frequency and the delay amount
- B is a characteristic curve showing the relationship between the internal temperature of the device and the delay amount
- FIG. 7 is a characteristic curve showing the relationship between temperature and delay amount in FIG.
- the delay time increases when the temperature rises, and decreases when the temperature falls. Therefore, in the sixth embodiment, the first table indicating the combination of the number of carriers and the carrier arrangement, or the delay amount corresponding to the center frequency specified by these, and the delay amount corresponding to the temperature. A second table showing the amount of decrease is prepared, and the amount of delay is obtained from these tables.
- FIG. 13 is a configuration diagram of the adaptive control device according to the sixth embodiment, and the same components as those of the fourth embodiment in FIG. The difference is
- the first and second two tables are registered in the delay time table storage 72.
- a temperature sensor 82 that measures the temperature inside the device is provided. 6
- the delay time acquisition unit 73 acquires the delay time based on a combination of the number of carriers and the arrangement of the carriers, or the center frequency specified by these and the temperature in the device. Is a point.
- the delay time obtaining unit 73 obtains from the communication control unit 59 the combination of the number of carriers and the carrier arrangement, or the center frequency specified by the number of carriers and the carrier arrangement, and the delay time corresponding thereto. From the first table. Next, the delay time obtaining unit 73 obtains the delay amount 3 corresponding to the internal temperature of the apparatus from the second table, and obtains the following equation.
- the delay time in consideration of the temperature of the device is obtained and set in the delay time setting section 74.
- the delay time setting unit 74 initializes the delay time input from the delay time acquisition unit 73 in the first selector 62 (see FIG. 1) of the delay unit 51c.
- the feedback signal y (t) is delayed by the set delay time in the delay unit 51c and reaches the error calculation unit 51a.
- the total delay time of the feedback signal becomes substantially equal to the total delay time until the transmission signal x (t), which is the reference signal, reaches the error calculation unit 51a via the delay unit 51b.
- the delay time of the feed pack signal changes depending on the carrier frequency.
- Figure 14 shows the relationship between the carrier frequency and the delay time. As the carrier frequency increases, the amount of delay increases. Therefore, in the seventh embodiment, the correspondence between the carrier frequency and the delay time is taped, and the delay time according to the actual carrier frequency is obtained from a table and set in the delay section. .
- FIG. 15 is a configuration diagram of the seventh embodiment, and the same parts as those in the first embodiment of FIG. 1 are denoted by the same reference numerals. The difference from the first embodiment is that
- the delay time acquisition unit 73 acquires the carrier frequency from the communication control unit 59, acquires the delay time corresponding to the carrier frequency from the delay time table, and inputs the delay time to the delay time setting unit 74.
- the control signal information set in the frequency converters 83 and 85 that convert the frequency of the baseband signal into RF signals and the frequency converters 84 and 86 that convert the frequency of the RF signal into baseband signals are used.
- the delay unit 51c has the same configuration as the delay unit 51c in FIG.
- adaptive control section 51d When a transmission signal is input, adaptive control section 51d inputs a signal obtained by reflecting the adaptive control result on reference signal x (t) to modulation section 52, and modulation section 52 converts the signal to an input signal.
- the DA converter 53 converts the modulated signal into an analog signal.
- the oscillator 83 of the frequency converter oscillates at the carrier frequency specified by the communication controller 59, and the multiplier 85 multiplies the baseband signal output from the DA converter by the carrier frequency signal to convert the frequency to a radio signal.
- the wireless signal is input to a power amplifier 54, which amplifies the input signal and radiates it to the space from an antenna 55.
- the directional coupler 56 extracts a part of the output of the power amplifier, and the multiplier 86 multiplies the radio signal by the carrier frequency signal generated from the oscillator 84 to frequency-convert the radio signal into a base-spread signal.
- the AD converter 57 converts the baseband signal output from the multiplier 86 into a digital signal and inputs the digital signal to the demodulation unit 58.
- the demodulation unit 58 performs demodulation processing on the input signal and inputs the demodulated signal to the adaptive control device 51.
- the delay time obtaining unit 73 obtains the carrier frequency from the communication control unit 59, obtains the delay time according to the carrier frequency from the delay time table storage unit 7, and inputs it to the delay time setting unit 74.
- the delay time setting unit 74 initially sets the delay time input from the delay time acquisition unit 73 in the first selector 62 (see FIG. 1) of the delay unit 51c.
- the feedpack signal y (t) is delayed by the set delay time in the delay unit 51c and reaches the error calculation unit 51a.
- the total delay time of the feed pack signal before reaching the error calculating section 51a is equal to the time until the reference signal x (t) reaches the error calculating section 51a via the delay section 51b. Is almost equal to the total delay time.
- the error calculation unit 51a calculates a difference e (t) between the reference signal (t) input via the delay units 51b and 51c and the feed pack signal y ′ (t), and the adaptive control unit 51d calculates the difference e (t). Adaptive control is performed so that t) becomes small, and the adaptive control result is reflected in the next reference signal. Thereafter, the above operation is repeated. With the above control, good adaptive control is possible.
- the delay time setting unit 74 In order to obtain the maximum correlation, the second selector 63 (see FIG. 1) of the delay section 51c is controlled to switch the shift position of the shift register 61 for extracting the feedback signal y (t). Change the delay time of the feed pack signal. Then, the delay time setting unit 74 stores the correlation value calculated by the sliding correlator 75 for each delay time, obtains the delay time at which the correlation value becomes maximum, and uses this delay time as the first selection of the delay unit 51c. Data to 63.
- the shift range for obtaining the maximum correlation may be a small range before and after the initially set delay time. This allows the delay time of the delay unit 51c to be quickly and fine-tuned to the real time so that the error between the feedback signal and the reference signal can be obtained.
- the arrival times at the operation unit can be matched with high accuracy, and good adaptive control can be performed.
- the difference between the delay time until the reference signal and the feed pack signal are input to the error calculation unit is determined, and the difference is set in the delay unit and controlled so that the difference becomes zero.
- a delay time difference characteristic with respect to the reference signal frequency can be created in advance, and the inverse characteristic can be set in a complex filter to control the delay time difference to be zero.
- FIG. 16 is a configuration diagram of the adaptive control device according to the eighth embodiment, and the same components as those in the first embodiment in FIG. The difference is
- the inverse characteristic creation unit 92 that creates the inverse characteristic with the delay time characteristic is provided.
- a complex filter coefficient determination unit 93 determines a coefficient so as to add the inverse characteristic to the feed pack signal and sets the coefficient to the complex filter 51f.
- the delay unit 51c has the same configuration as the delay unit 51c in FIG.
- FIG. 17 is a configuration diagram of a complex filter.
- the transmission signal and the feedback signal are complex signals.
- the complex filter 51f is composed of four FIR filters 101 to 104 and adders 105 and 106, and feeds to FIR filters 101 and 103.
- the real part of the back signal is input, and the imaginary part of the feedback signal is input to the FIR filters 102 and 104.
- An adder 105 combines the outputs of the FIR filters 101 and 102 and outputs a real part
- an adder 106 combines the outputs of the FIR filters 103 and 104 and outputs an imaginary part.
- a predetermined delay characteristic can be given to the input signal by the coefficient of the complex filter 51f.
- a complex filter coefficient is determined and set in the complex filter 51f. That is, similarly to the second embodiment, the communication control unit 59 controls the switch 60 to select a training signal, and instructs the delay time control unit 51e to create a delay time characteristic. Next, the communication control unit 59 generates a first training signal (see FIG. 2) of the center frequency fo, and inputs the center frequency fo to the delay time characteristic creation unit 91. When the delay characteristic is obtained, the complex filter 51f is set to be a filter having a delay characteristic flat and an imaginary part coefficient of 0.
- the delay time setting unit 74 controls the second selector 63 (see FIG. 1) of the delay unit 51c to obtain the feedback signal y (t) in order to obtain the maximum correlation. Switch the position, thereby changing the delay time of the feed pack signal. Then, the delay time setting unit 74 stores the correlation value calculated by the correlator 75 for each delay time, obtains the delay time at which the correlation value becomes maximum, and inputs this delay time to the delay time characteristic creation unit 91 .
- the delay time characteristic creation unit 91 stores the input delay time in association with the center frequency fo.
- the communication control unit 59 uses the switch 60 to input the input signal. Signal to the adaptive control device.
- adaptive control section 51d reflects the result of the adaptive control on transmission signal x (t)
- modulation section 52 modulates the signal reflecting the adaptive control
- DA converter 53 modulates the signal.
- the signal is converted into an analog signal and input to the power amplifier 54.
- the power amplifier 54 amplifies the input signal and radiates it to the space from the antenna 55.
- the directional coupler 56 detects a part of the output of the power amplifier, the AD converter 57 converts the detection signal into a digital signal and inputs the digital signal to the demodulation unit 58, and the demodulation unit 58 performs demodulation processing on the input signal and performs adaptive control. Input to device 51.
- the complex filter 51 f of the adaptive controller performs filtering on the feedpack signal so that the delay time difference becomes zero.
- the error calculator 51a calculates the difference e (t) between the reference signal (t) input via the delay unit 51b and the complex filter 51f and the feedback signal y ′ (t), and the adaptive controller Id calculates the difference e (t).
- Adaptive control is performed so that (t) is reduced, and the result of the adaptive control is reflected in the next reference signal. Thereafter, the above operation is repeated. With the above control, good adaptive control becomes possible.
- the present invention is applied to the case where distortion generated in a power amplifier in a transmission device is compensated.
- the present invention is not limited to such a case, and can be applied to a case where noise is reduced by adaptive control.
- a correlator can be configured using a matched filter.
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Transmitters (AREA)
- Amplifiers (AREA)
Description
Claims
Priority Applications (4)
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JP2004510127A JP3923978B2 (ja) | 2002-05-31 | 2002-05-31 | 適応制御装置 |
EP02730824.6A EP1511179B1 (en) | 2002-05-31 | 2002-05-31 | Adaptive controller |
PCT/JP2002/005324 WO2003103164A1 (ja) | 2002-05-31 | 2002-05-31 | 適応制御装置 |
US10/976,290 US7496152B2 (en) | 2002-05-31 | 2004-10-26 | Adaptive control apparatus |
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PCT/JP2002/005324 WO2003103164A1 (ja) | 2002-05-31 | 2002-05-31 | 適応制御装置 |
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US10/976,290 Continuation US7496152B2 (en) | 2002-05-31 | 2004-10-26 | Adaptive control apparatus |
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WO2003103164A1 true WO2003103164A1 (ja) | 2003-12-11 |
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US (1) | US7496152B2 (ja) |
EP (1) | EP1511179B1 (ja) |
JP (1) | JP3923978B2 (ja) |
WO (1) | WO2003103164A1 (ja) |
Cited By (4)
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JP2008205759A (ja) * | 2007-02-20 | 2008-09-04 | Japan Radio Co Ltd | 歪補償装置 |
JP2009290853A (ja) * | 2008-05-27 | 2009-12-10 | Shoshun Kagi Kofun Yugenkoshi | 搬送波発振器 |
WO2011074027A1 (ja) * | 2009-12-15 | 2011-06-23 | 富士通株式会社 | 電源装置 |
US9236893B2 (en) | 2014-05-21 | 2016-01-12 | Fujitsu Limited | Distortion compensation device and distortion compensation method |
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JP4323968B2 (ja) * | 2004-01-14 | 2009-09-02 | 株式会社日立コミュニケーションテクノロジー | 無線通信装置のタイミング調整方法 |
DE602005025406D1 (de) * | 2005-01-04 | 2011-01-27 | Fujitsu Ltd | Gleichstrom-offsetkompensationsverfahren und -einrichtung |
US7542519B2 (en) * | 2005-12-29 | 2009-06-02 | Crestcom, Inc. | Radio frequency transmitter and method therefor |
JP4388943B2 (ja) * | 2006-10-23 | 2009-12-24 | Okiセミコンダクタ株式会社 | 相関器 |
CN102007700B (zh) * | 2008-04-21 | 2013-12-11 | 日本电信电话株式会社 | 无线电通信***、发送装置、接收装置、无线电通信方法、发送方法、接收方法 |
JP4721074B2 (ja) * | 2008-04-23 | 2011-07-13 | ソニー株式会社 | 受信装置および受信方法、並びにプログラム |
JP5251565B2 (ja) * | 2009-02-05 | 2013-07-31 | 富士通株式会社 | プリディストータ及びその遅延調整方法 |
US9128496B2 (en) * | 2011-10-26 | 2015-09-08 | The United States Of America As Represented By Secretary Of The Navy | Auto-ranging for time domain extraction of perturbations to sinusoidal oscillation |
JP6311457B2 (ja) * | 2014-05-30 | 2018-04-18 | 富士通株式会社 | 制御装置、dc−dcコンバータ、スイッチング電源装置及び情報処理装置 |
JP2016167781A (ja) * | 2015-03-10 | 2016-09-15 | 富士通株式会社 | 無線通信装置及び無線通信装置の制御方法 |
JP2017200147A (ja) * | 2016-04-28 | 2017-11-02 | 富士通株式会社 | 無線装置及び係数更新方法 |
US11770145B2 (en) | 2021-08-27 | 2023-09-26 | Samsung Electronics Co., Ltd | System and method for efficient initialization of memory digital pre-distorter coefficients to reduce calibration time |
WO2024084629A1 (en) * | 2022-10-19 | 2024-04-25 | Tokyo Institute Of Technology | System for compensating the non-linear distortion introduced by a radio power amplifier based on harmonic analysis |
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Also Published As
Publication number | Publication date |
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US7496152B2 (en) | 2009-02-24 |
JP3923978B2 (ja) | 2007-06-06 |
EP1511179A1 (en) | 2005-03-02 |
US20050058220A1 (en) | 2005-03-17 |
EP1511179B1 (en) | 2013-07-03 |
JPWO2003103164A1 (ja) | 2005-10-06 |
EP1511179A4 (en) | 2006-10-04 |
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