WO2013069087A1 - Circuit de compensation de la distorsion et procédé de compensation de la distorsion - Google Patents

Circuit de compensation de la distorsion et procédé de compensation de la distorsion Download PDF

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Publication number
WO2013069087A1
WO2013069087A1 PCT/JP2011/075634 JP2011075634W WO2013069087A1 WO 2013069087 A1 WO2013069087 A1 WO 2013069087A1 JP 2011075634 W JP2011075634 W JP 2011075634W WO 2013069087 A1 WO2013069087 A1 WO 2013069087A1
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Prior art keywords
transmission
signal
distortion compensation
group
power
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PCT/JP2011/075634
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English (en)
Japanese (ja)
Inventor
鈴木　賢治
路子 佐藤
俊一 土屋
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富士通株式会社
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Priority to PCT/JP2011/075634 priority Critical patent/WO2013069087A1/fr
Publication of WO2013069087A1 publication Critical patent/WO2013069087A1/fr

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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
    • 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
    • H03F2201/00—Indexing scheme relating to details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements covered by H03F1/00
    • H03F2201/32—Indexing scheme relating to modifications of amplifiers to reduce non-linear distortion
    • H03F2201/3233—Adaptive predistortion using lookup table, e.g. memory, RAM, ROM, LUT, to generate the predistortion

Definitions

  • the present invention relates to a distortion compensation circuit and a distortion compensation method.
  • DPD digital pre-distortion
  • the conventional distortion compensation circuit has the same number of DPD circuits as the transmission system. For this reason, when a plurality of transmission systems are installed in one distortion compensation circuit, the circuit scale of the distortion compensation circuit may increase.
  • a distortion compensation circuit having a plurality of transmission systems only a single DPD circuit is installed for all installed transmission systems, and distortion compensation processing of each transmission system is performed by time division control. There is technology.
  • a single DPD circuit performs time-division compensation processing for all of the plurality of transmission systems, so that all transmission system distortions are in a stable state. It takes a lot of time to become. Therefore, it is difficult to complete the distortion compensation process quickly. In such a case, there is a possibility that unnecessary waves may be transmitted in the air before the distortion of all the transmission systems becomes stable.
  • the DPD circuit cannot follow the conventional technology that performs processing in a time-sharing manner, and there is a possibility that distortion deterioration occurs in a plurality of transmission systems at the same time.
  • distortion compensation is performed in each of a plurality of transmission systems even at the start of transmission, it may take a very long time for the transmission state to stabilize.
  • the disclosed technique has been made in view of the above, and an object of the present invention is to provide a distortion compensation circuit and a distortion compensation method for quickly performing distortion compensation processing with a reduced circuit scale.
  • the signal receiving unit receives a plurality of input signals separately.
  • the plurality of distortion compensators acquire a plurality of distortion compensators that perform distortion compensation using a distortion compensation coefficient on the input signal acquired from the corresponding signal receiver, and the plurality of amplifiers acquire from the corresponding distortion compensator.
  • An output signal generated by amplifying the input signal is output.
  • the compensation coefficient calculation unit divides the amplification unit into a plurality of groups according to a predetermined condition, selects one output signal as the representative signal for each group from the output signals output from the amplification unit, and the representative signal and the representative signal A distortion compensation coefficient is generated for each group corresponding to the representative signal on the basis of error data with an input signal corresponding to the generated signal, and the generated distortion compensation coefficient corresponds to the amplification unit included in the group represented by the representative signal. Output to the distortion compensator.
  • the distortion compensation circuit and the distortion compensation method disclosed in the present application there is an effect that the distortion compensation processing can be performed quickly while suppressing the circuit scale.
  • FIG. 1 is a block diagram of a distortion compensation circuit according to the first embodiment.
  • FIG. 2 is a block diagram showing each group selection unit in detail.
  • FIG. 3 is a diagram of an example of the amplifier according to the first embodiment.
  • FIG. 4 is a diagram for explaining input / output characteristics of the Doherty amplifier.
  • FIG. 5 is a diagram illustrating the relationship of grouping using the input / output characteristics of the amplifier and the power threshold.
  • FIG. 6A is a diagram illustrating LUT characteristics according to transmission power in the first group.
  • FIG. 6B is an image diagram of distortion degradation accompanying transmission power fluctuation in the first group.
  • FIG. 7A is a diagram illustrating LUT characteristics according to transmission power in the second group.
  • FIG. 7B is an image diagram of distortion degradation accompanying transmission power fluctuation in the second group.
  • FIG. 8 is a flowchart of the distortion compensation operation at the start of transmission in the distortion compensation circuit according to the first embodiment.
  • FIG. 9 is a flowchart of the distortion compensation operation when the transmission power fluctuates in the DPD1 system of the distortion compensation circuit according to the first embodiment.
  • FIG. 10 is a flowchart of the distortion compensation operation when the transmission power fluctuates in the DPD2 system of the distortion compensation circuit according to the first embodiment.
  • FIG. 11 is a flowchart of interrupt processing in the DPD1 system when the transmission power of the distortion compensation circuit according to the first embodiment varies.
  • FIG. 12 is a block diagram of a distortion compensation circuit according to the second embodiment.
  • FIG. 13A is a schematic diagram illustrating grouping and connection of transmission systems in the normal mode.
  • FIG. 13B is a schematic diagram illustrating grouping and connection of transmission systems in the bias power mode.
  • FIG. 14 is a flowchart of the operation at the time of switching from the normal mode to the bias power mode.
  • FIG. 15 is a flowchart of the operation in the biased power mode of the DPD1 system when the first group assignment becomes zero.
  • FIG. 16 is a flowchart of the operation when returning from the bias power mode to the normal mode.
  • FIG. 1 is a block diagram of a distortion compensation circuit according to the first embodiment.
  • FIG. 2 is a block diagram showing each group selection unit in detail.
  • the compensation coefficient calculation unit 201 and the compensation coefficient calculation unit 202 are displayed so as to overlap each other for easy understanding of the signal flow.
  • the input / output of signals to / from the compensation coefficient calculation unit 202 is represented by dotted lines for easy understanding.
  • the ADC 227, the multiplier 225, and the oscillator 228 are omitted for easy understanding of the processing of the compensation coefficient calculation unit 202.
  • the description of each omitted part may be omitted, but in actuality, signals are transmitted and received through them.
  • the distortion compensation circuit according to the present embodiment has input paths 11 to 15 as shown in FIG.
  • input route 10 when the input route is not distinguished, it is referred to as “input route 10”.
  • input route 10 five input paths are illustrated as the input path 10, but in actuality, there are n (n ⁇ 2).
  • the distortion compensation circuit according to the present embodiment has the same number of transmission processing units 1 as the input path 10.
  • FIG. 1 shows the transmission processing unit 1 as an example, but actually there are n transmission processing units 1.
  • Each transmission processing unit 1 is connected to a different input path 10.
  • Each transmission processing unit 1 is connected to a different antenna.
  • the corresponding combinations of the input path 10, the transmission processing unit 1, and the antenna are collectively referred to as a transmission system.
  • the transmission system corresponding to the input path 11 is referred to as transmission 1 system.
  • a transmission system corresponding to the input path 12 is referred to as a transmission 2 system.
  • a transmission system corresponding to the input path 13 is referred to as a transmission 3 system.
  • a transmission system corresponding to the input path 14 is referred to as a transmission 4 system.
  • a transmission system corresponding to the input path 15 is referred to as a transmission n system.
  • the distortion compensation circuit according to the present embodiment includes a group selection unit 3, a training value storage unit 4, a group selection unit 5, and a group selection unit 6. Furthermore, the distortion compensation circuit according to the present embodiment includes a compensation coefficient calculation unit 201 and a compensation coefficient calculation unit 202.
  • the transmission processing unit 1 includes a multiplier 101, a distortion compensation calculation unit 102, a DAC (Digital Analog Converter) 103, a QMOD (Quadrature MODulator) 4, an amplifier 105, an oscillator 106, an address generation unit 107, a storage unit 108, and a power measurement unit 109.
  • LUT Look Up Table
  • Multiplier 101 receives a transmission signal. Furthermore, the multiplier 101 acquires a distortion compensation coefficient from the LUT 110. Next, the multiplier 101 multiplies the transmission signal by a distortion compensation coefficient. Multiplier 101 then outputs the transmission signal multiplied by the distortion compensation coefficient to distortion compensation calculation section 102.
  • the multiplier 101 directly converts the transmission signal into a distortion compensation calculation unit. To 102.
  • the distortion compensation calculation unit 102 receives an input of a transmission signal multiplied by a distortion compensation coefficient from the multiplier 101. Then, the distortion compensation calculation unit 102 performs distortion compensation processing on the received transmission signal.
  • the distortion compensation calculation unit 102 receives an input of a transmission signal that has not been multiplied by the distortion compensation coefficient from the multiplier 101. Then, in a state where the distortion compensation coefficient is not calculated, such as at the start of transmission, the distortion compensation calculation unit 102 acquires the training value stored in the training value storage unit 4 as an initial value. In that case, the distortion compensation calculation unit 102 performs distortion compensation processing on the received transmission signal using the acquired training value.
  • the distortion compensation calculation unit 102 outputs a transmission signal subjected to distortion compensation processing to the DAC 103.
  • the DAC 103 receives an input of a transmission signal subjected to distortion compensation processing from the distortion compensation calculation unit 102.
  • the DAC 103 converts the received digital transmission signal into an analog signal. Thereafter, the DAC 103 outputs the transmission signal converted into the analog signal to the QMOD 104.
  • QMOD 104 receives an input of a transmission signal converted into an analog signal from DAC 103.
  • QMOD 104 also receives a reference carrier wave from oscillator 106.
  • the QMOD 104 performs quadrature modulation by adding a product obtained by multiplying the transmission signal by the reference carrier and a product obtained by multiplying the transmission signal by a signal obtained by shifting the reference carrier by 90 degrees. Thereafter, QMOD 104 outputs the orthogonally modulated transmission signal to amplifier 105.
  • the amplifier 105 is a Doherty amplifier as shown in FIG.
  • FIG. 3 is a diagram of an example of the amplifier according to the first embodiment.
  • the amplifier 105 includes an input terminal 151, a power distributor 152, a carrier amplifier 153, a peak amplifier 154, an impedance converter 155, and an output terminal 156.
  • the amplifier 105 receives an input of the transmission signal to the input terminal 151 from the QMOD 104.
  • the power distributor 152 outputs a transmission signal only to the carrier amplifier 153 when the input power of the transmission signal input to the input terminal 151 is higher than a predetermined threshold.
  • the transmission signal is output to both the carrier amplifier 153 and the peak amplifier 154.
  • the carrier amplifier 153 is an amplifier having a linear characteristic when the input power is low.
  • the carrier amplifier 153 has input / output characteristics such as a graph 301 in FIG.
  • FIG. 4 is a diagram for explaining the input / output characteristics of the Doherty amplifier.
  • the vertical axis represents output power
  • the horizontal axis represents input power.
  • the carrier amplifier 153 amplifies the transmission signal input from the power distributor 152.
  • the carrier amplifier 153 generates a signal having output power corresponding to the input / output characteristics represented by the graph 301 in FIG. Then, the carrier amplifier 153 outputs the generated signal to the impedance converter 155.
  • the peak amplifier 154 is an amplifier having a linear characteristic when the input power is high.
  • the peak amplifier 154 has input / output characteristics such as a graph 302 in FIG.
  • the peak amplifier 154 amplifies the transmission signal input from the power distributor 152. In this case, the peak amplifier 154 generates a signal having output power corresponding to the input / output characteristics represented by the graph 302 in FIG. Then, the peak amplifier 154 outputs the generated signal to the impedance converter 155.
  • the impedance converter 155 receives a signal input from the carrier amplifier 153 when the input power of the transmission signal input to the input terminal 151 is lower than a predetermined threshold. Then, the impedance converter 155 outputs the signal input from the carrier amplifier 153 toward the output terminal 156. When the input power of the transmission signal input to the input terminal 151 is higher than a predetermined threshold value, the impedance converter 155 receives signal input from both the carrier amplifier 153 and the peak amplifier 154. The impedance converter 155 adjusts the output impedance of each signal input from the carrier amplifier 153 and the peak amplifier 154. The impedance converter 155 then combines the signals input from the carrier amplifier 153 and the peak amplifier 154 to generate an output signal. Thereafter, the impedance converter 155 outputs the generated output signal to the output terminal 156. The output signal is output to an external apparatus such as a mobile station apparatus via the output terminal 156 and the antenna.
  • an external apparatus such as a mobile station apparatus via the output terminal 156 and the antenna.
  • the amplifier 105 generates a signal only from the output of the carrier amplifier 153 when the input power is low, and generates a signal by combining the outputs of the carrier amplifier 153 and the peak amplifier 154 when the input power is high.
  • a graph 303 in FIG. 4 represents input / output characteristics of the amplifier 105. That is, as shown in the graph 303, the input / output characteristics of the amplifier 105 coincide with the output characteristics of the carrier amplifier 153 when the input power is low. When the input power is high, the input / output characteristics of the amplifier 105 match the input / output characteristics obtained by combining the outputs of the carrier amplifier 153 and the peak amplifier 154. In other words, the input / output characteristics of the amplifier 105 which is a Doherty amplifier is such that the peak amplifier 154 compensates for the portion above the saturation of the carrier amplifier 153, thereby forming a high output characteristic.
  • the address generation unit 107 receives the transmission signal input from the input path 11. Then, the address generation unit 107 generates a distortion compensation coefficient address from the transmission power of the transmission signal. Then, the address generation unit 107 stores the generated distortion compensation coefficient address in the storage unit 108.
  • the storage unit 108 is a storage device such as a memory or a hard disk.
  • the power measuring unit 109 receives the transmission signal input from the input path 11. Next, the power measuring unit 109 measures the transmission power of the transmission signal. In the present embodiment, the power measuring unit 109 measures the transmission power of the transmission signal by integrating the transmission power of the transmission signal during each frame. Here, in this embodiment, the transmission power is measured for one frame, but this may be another period, for example, one slot. Then, the power measurement unit 109 outputs the measured transmission power of the transmission signal to the fluctuation amount monitoring unit 211 of the compensation coefficient calculation unit 201 and the fluctuation amount monitoring unit 221 of the compensation coefficient calculation unit 202 described later.
  • the LUT 110 receives the distortion compensation coefficient from the calculation processing unit 213 of the compensation coefficient calculation unit 201 or the calculation processing unit 223 of the compensation coefficient calculation unit 202 via the group selection unit 3.
  • the LUT 110 maps the received distortion compensation coefficient to a table in association with the distortion compensation coefficient address stored in the storage unit 108.
  • the LUT 110 updates the mapping of the distortion compensation coefficient and the distortion compensation coefficient address at any time as the transmission power varies.
  • the training value storage unit 4 is a storage device such as a memory or a hard disk.
  • the training value storage unit 4 stores various simulated parameters for performing distortion compensation measured in a test at a factory where the distortion compensation circuit according to this embodiment is manufactured.
  • the group selection unit 5 receives a notification of the group assigned to each transmission system from the fluctuation amount monitoring unit 211 and the fluctuation amount monitoring unit 221 as described later.
  • the group selection unit 5 switches the connection of each transmission system to the compensation coefficient calculation unit 201 or the compensation coefficient calculation unit 202 according to the received group assignment.
  • the group selection unit 5 includes an FW (ForWard) signal input SW (SWitch) 51, a selector 52, and a selector 53 shown in FIG.
  • the FW signal input SW 51 is a compensation coefficient calculation unit 201 or a compensation coefficient calculation for an input path of a transmission signal (hereinafter referred to as “FW signal”) input to the transmission processing unit 1 in each transmission system.
  • FW signal a compensation coefficient calculation unit 201 or a compensation coefficient calculation for an input path of a transmission signal (hereinafter referred to as “FW signal”) input to the transmission processing unit 1 in each transmission system.
  • Each of the transmission systems has a switch that selectively connects one of the units 202.
  • the FW signal input SW 51 switches the connection in response to an instruction from the fluctuation amount monitoring units 211 and 221. For example, a case where an instruction is given from the fluctuation amount monitoring unit 211 to assign the transmission 1 system to a group managed by the compensation coefficient calculation unit 202 will be described. In this case, the FW signal input SW 51 switches the switch corresponding to the transmission 1 system so that the input path of the transmission 1 system FW signal and the selector 53 connected to the compensation coefficient calculation unit 202 are connected.
  • the FW signal input SW 51 is switched so that the input paths of the FW signals of all transmission systems are connected to the selectors 52 connected to the compensation coefficient calculation unit 201. Switch over.
  • the FW signal input SW 51 outputs the FW signal input from each transmission system to either the selector 52 or 53 that is the connection destination of each transmission system selected by the switch.
  • the selector 52 receives information on the transmission system having the maximum transmission power from the fluctuation amount monitoring unit 211. The meaning when the transmission power fluctuates will be specifically described later. Then, the selector 52 extracts the FW signal from the transmission system having the maximum transmission power from the FW signal received from the FW signal input SW51. Then, the selector 52 outputs the FW signal from the transmission system having the maximum transmission power to the storage unit 212.
  • the selector 52 determines the order of each transmission system assigned to the compensation coefficient calculation unit 201 as a compensation coefficient calculation unit. 201 from the fluctuation amount monitoring unit 211.
  • the order of each transmission system is the order in which the amount of power fluctuation is large, as will be described later.
  • the selector 52 sequentially outputs the FW signal received from the FW signal input SW51 to the storage unit 212 in a time division manner in accordance with the designation of the transmission system order.
  • the selector 53 receives information on the transmission system having the minimum transmission power from the fluctuation amount monitoring unit 221. Then, the selector 53 extracts the FW signal from the transmission system having the minimum transmission power from the FW signal received from the FW signal input SW51. Then, the selector 53 outputs the FW signal from the transmission system having the minimum transmission power to the storage unit 222.
  • the selector 53 receives the order of each transmission system assigned to the compensation coefficient calculation unit 202 from the fluctuation amount monitoring unit 221 of the compensation coefficient calculation unit 202.
  • the order of each transmission system is the order in which the amount of power fluctuation is large, as will be described later. Then, the selector 53 sequentially outputs the FW signal received from the FW signal input SW 51 to the storage unit 222 in a time division manner in accordance with the designation of the transmission system order.
  • the group selection unit 6 receives a notification of the group assigned to each transmission system from the fluctuation amount monitoring unit 211 and the fluctuation amount monitoring unit 221 as described later.
  • the group selection unit 6 switches the connection of each transmission system to the compensation coefficient calculation unit 201 or the compensation coefficient calculation unit 202 according to the received group assignment.
  • the group selection unit 6 includes an FB (FeedBack) signal input SW (SWitch) 61, a selector 62, and a selector 63 shown in FIG.
  • the FB signal input SW 61 uses the compensation coefficient calculation unit 201 or the compensation coefficient calculation as the input path of the transmission signal (hereinafter referred to as “FB signal”) output from the transmission processing unit 1 in each transmission system.
  • FB signal the compensation coefficient calculation unit 201 or the compensation coefficient calculation as the input path of the transmission signal
  • the FB signal input SW 61 switches the connection in response to an instruction from the fluctuation amount monitoring units 211 and 221. For example, a case where an instruction is given from the fluctuation amount monitoring unit 211 to assign the transmission 1 system to a group managed by the compensation coefficient calculation unit 202 will be described. In that case, the FB signal input SW 61 switches the switch corresponding to the transmission 1 system so that the input path of the FB signal of the transmission 1 system and the selector 63 connected to the compensation coefficient calculation unit 202 are connected.
  • the FB signal input SW 61 is switched so that the input paths of the FB signals of all transmission systems are connected to the selectors 62 connected to the compensation coefficient calculation unit 201. Switch over.
  • the FB signal input SW 61 outputs the FB signal input from each transmission system to either the selector 62 or 63 that is a connection destination of each transmission system selected by the switch.
  • the selector 62 receives information on the transmission system having the maximum transmission power from the fluctuation amount monitoring unit 211. Then, the selector 62 extracts the FB signal from the transmission system having the maximum transmission power from the FB signal received from the FB signal input SW 61. Then, the selector 62 outputs the FB signal from the transmission system having the maximum transmission power to the storage unit 216 via the ADC 217.
  • the selector 62 receives the order of each transmission system assigned to the compensation coefficient calculation unit 201 from the fluctuation amount monitoring unit 211 of the compensation coefficient calculation unit 201.
  • the order of each transmission system is the order in which the power fluctuation amount is large as will be described later.
  • the selector 62 outputs the FB signal received from the FB signal input SW 61 to the storage unit 216 via the ADC 217 in a time division manner in accordance with the designation of the transmission system order.
  • the selector 63 receives information on the transmission system having the minimum transmission power from the fluctuation amount monitoring unit 221. Then, the selector 63 extracts the FB signal from the transmission system having the minimum transmission power from the FB signal received from the FB signal input SW 61. Then, the selector 63 outputs the FB signal from the transmission system having the minimum transmission power to the storage unit 226 via the ADC 227.
  • the selector 63 receives the order of each transmission system assigned to the compensation coefficient calculation unit 202 from the fluctuation amount monitoring unit 221 of the compensation coefficient calculation unit 202.
  • the order of each transmission system is the order in which the amount of power fluctuation is large, as will be described later. Then, the selector 63 outputs the FB signal received from the FB signal input SW 61 to the storage unit 226 via the ADC 227 in a time division manner in accordance with the designation of the transmission system order.
  • the compensation coefficient calculation unit 201 includes a fluctuation amount monitoring unit 211, a storage unit 212, an arithmetic processing unit 213, a DemiFil 214, a multiplier 215, a storage unit 216, an ADC (Analog Digital Converter) 217, and an oscillator 218.
  • the function of the compensation coefficient calculation unit 201 is controlled by a CPU (Central Processing Unit).
  • the fluctuation amount monitoring unit 211 stores a power threshold for grouping transmission systems.
  • the power threshold value is a power value at a portion where the input / output characteristics of only the carrier amplifier 153 and the input / output characteristics obtained by combining the carrier amplifier 153 and the peak amplifier 154 are switched.
  • a transmission system group having transmission power equal to or higher than the power threshold is referred to as a “first group”
  • a transmission system group having transmission power lower than the power threshold is referred to as a “second group”.
  • FIG. 5 is a diagram illustrating the relationship of grouping using the input / output characteristics of the amplifier and the power threshold.
  • a graph 400 in FIG. 5 is a graph showing the input / output characteristics of the amplifier 105, and is the same as the graph 303 in FIG.
  • the vertical axis represents output power
  • the horizontal axis represents input power.
  • a graph 410 is a graph representing LUT characteristics. In the graph 410, the vertical axis represents the compensation coefficient, and the horizontal axis represents the transmission power. That is, the graph 410 represents the compensation coefficient corresponding to the transmission power.
  • a point 401 of the graph 400 is a portion where the input / output characteristics of the amplifier 105 are switched between the input / output characteristics of only the carrier amplifier 153 and the input / output characteristics obtained by combining the carrier amplifier 153 and the peak amplifier 154. That is, the power value at the point 401 becomes the power threshold value.
  • the power value at the point 401 corresponds to the transmission power 414 in the graph 400 of the LUT characteristic as represented by a dotted line arrow. That is, the first group is a group to which a transmission system in which transmission power is included in a range 413 that is greater than or equal to transmission power 414 and less than or equal to maximum transmission power is assigned.
  • the second group is a group to which a transmission system in which transmission power is included in a range 412 that is less than the transmission power 414 and is equal to or higher than the minimum transmission power is assigned.
  • the compensation coefficient in the LUT characteristic of the distortion compensation circuit according to the present embodiment increases as the transmission power increases from the minimum transmission power, then decreases once, and increases toward the maximum transmission power again.
  • the LUT characteristic is a compensation coefficient that becomes a minimum point when it once falls at a point 411 corresponding to the transmission power 414 that is the threshold power.
  • FIG. 6A is a diagram illustrating LUT characteristics according to transmission power in the first group.
  • FIG. 6B is an image diagram of distortion degradation accompanying transmission power fluctuation in the first group.
  • FIG. 7A is a diagram illustrating LUT characteristics according to transmission power in the second group.
  • FIG. 7B is an image diagram of distortion degradation accompanying transmission power fluctuation in the second group.
  • the LUT characteristic in the case of the maximum transmission power in the first group is represented by the LUT characteristic 501.
  • the LUT characteristic in the case of the minimum transmission power in the first group is represented by the LUT characteristic 502. That is, in the first group, the transmission power fluctuation range is a range 503.
  • the correspondence between each transmission frequency and the transmission power is as shown by a graph 512 represented by a dotted line in FIG. 6B.
  • the transmission standard 511 is satisfied.
  • the distortion deterioration that occurs in this case is represented by a region 514.
  • the distortion degradation represented by this area 514 is within the transmission standard 511. That is, even if the maximum variation in transmission power occurs in the first group, transmission signals can be transmitted without departing from the transmission standard.
  • the LUT characteristic in the case of the maximum transmission power in the second group is represented by the LUT characteristic 521.
  • the LUT characteristic in the case of the minimum transmission power in the second group is represented by the LUT characteristic 522. That is, in the second group, the transmission power fluctuation range is a range 523.
  • the correspondence between each transmission frequency and the transmission power is as shown by a graph 532 represented by a dotted line in FIG. 7B.
  • the transmission standard 531 is satisfied.
  • the distortion deterioration that occurs in this case is represented by a region 534.
  • the distortion degradation represented by this area 534 is within the transmission standard 531. That is, even if the maximum variation in transmission power occurs in the second group, transmission signals can be transmitted without departing from the transmission standard.
  • the fluctuation amount monitoring unit 211 receives input of transmission power of each transmission system from each power measurement unit 109 of the transmission processing unit 1 corresponding to each transmission system. More specifically, as shown in FIG. 2, the fluctuation amount monitoring unit 211 acquires the transmission power data stored in the storage unit 7 by the power measurement unit 109 from the storage unit 7, thereby transmitting the transmission of each transmission system. Get power. Then, the fluctuation amount monitoring unit 211 acquires the transmission power of each transmission system assigned to the first group from the received transmission power of each transmission system. Next, the fluctuation amount monitoring unit 211 determines whether or not the transmission power of each transmission system assigned to the first group is greater than or equal to the power threshold value.
  • the fluctuation amount monitoring unit 211 selects the group selection unit 5 and the group selection so as to switch the transmission system whose transmission power is less than the power threshold among the transmission systems assigned to the first group to the second group. Notification to the unit 6. Specifically, the fluctuation amount monitoring unit 211 instructs the FW signal input SW51 and the FB signal input SW61 shown in FIG. 2 to switch the transmission system whose transmission power is less than the power threshold to the second group. Further, the fluctuation amount monitoring unit 211 changes the compensation coefficient calculation unit 202 to switch the transmission system whose transmission power is less than the power threshold among the transmission systems assigned to the first group to the second group. The amount monitoring unit 221 is notified.
  • the fluctuation amount monitoring unit 211 stores the order of each transmission system assigned to the first group in descending order of power fluctuation amount. Then, the fluctuation amount monitoring unit 211 determines whether or not a large power fluctuation (hereinafter referred to as “large power fluctuation”) occurs in the transmission power of each transmission system assigned to the first group. .
  • the fluctuation amount monitoring unit 211 determines that a large power fluctuation has occurred when a change occurs in the order of the power fluctuation amounts of the transmission systems assigned to the first group. A case where large power fluctuations occur in the transmission power of each transmission system in this way is referred to as “transmission power fluctuation time”. Then, the fluctuation amount monitoring unit 211 changes the order of the transmission systems assigned to the first group when a large power fluctuation occurs.
  • the fluctuation amount monitoring unit 211 has a transmission system with the maximum transmission power among the transmission systems assigned to the first group among the transmission systems assigned to the first group at the time of transmission start and transmission power fluctuation. Is identified.
  • the FW signal from the transmission system with the maximum transmission power is an example of the “representative signal” in the first group.
  • the fluctuation amount monitoring unit 211 outputs, to the group selection unit 5, information on the transmission system with the maximum transmission power among the transmission systems assigned to the first group. Specifically, as illustrated in FIG. 2, the fluctuation amount monitoring unit 211 outputs, to the selector 52, information on the transmission system with the maximum transmission power among the transmission systems assigned to the first group.
  • the fluctuation amount monitoring unit 211 selects the order of each transmission system assigned to the first group by the selector 52. Notify
  • the fluctuation amount monitoring unit 211 notifies the group selection unit 3 to switch to the transmission system assigned to the first group at the time of transmission start and transmission power fluctuation. Specifically, the fluctuation amount monitoring unit 211 notifies the distortion compensation coefficient output SW31 illustrated in FIG. 2 of an instruction to switch to the transmission system assigned to the first group. Further, the fluctuation amount monitoring unit 211 instructs the selector 32 to copy the distortion compensation coefficient received from the arithmetic processing unit 213 to the LUT 110 of the transmission processing unit 1 corresponding to the transmission system assigned to the first group.
  • the fluctuation amount monitoring unit 211 selects the order of each transmission system assigned to the first group by the selector 32.
  • the storage unit 212 is a storage device such as a memory.
  • the storage unit 212 stores the FW signal received from the group selection unit 5. At the start of transmission and when transmission power fluctuates, the storage unit 212 stores the FW signal in the transmission system having the maximum transmission power among the transmission systems belonging to the first group. Further, during stable operation, the storage unit 212 sequentially stores the FW signals in the transmission systems belonging to the first group in a time-sharing manner in descending order of the power fluctuation amount of the transmission system.
  • the ADC 217 receives the FB signal from the group selection unit 6. At the start of transmission and when the transmission power fluctuates, the ADC 217 receives an FB signal in the transmission system having the maximum transmission power among the transmission systems belonging to the first group. Further, during stable operation, the ADC 217 sequentially receives the FB signals in the respective transmission systems belonging to the first group in a time division manner in descending order of the power fluctuation amount of the transmission system. Then, the ADC 217 converts the received FB signal, which is an analog signal, into a digital signal. Then, the ADC 217 outputs the FB signal converted into the digital signal to the storage unit 216.
  • the storage unit 216 is a storage device such as a memory.
  • the storage unit 216 stores the FB signal received from the ADC 217.
  • the multiplier 215 acquires the FB signal from the storage unit 216. Further, the oscillation clock oscillated by the oscillator 218 is acquired. Then, the multiplier 215 performs frequency conversion by multiplying the FB signal by the oscillation clock, and matches the frequency of the FB signal with the frequency of the FW signal. Thereafter, the multiplier 215 outputs the FB signal whose frequency has been converted to the DemiFil 214.
  • DemiFil 214 receives an FB signal input from multiplier 215. Then, DemiFil 214 performs delay adjustment on the FB signal so as to correspond to the FW signal. Then, DemiFil 214 outputs the delay-adjusted FB signal to the arithmetic processing unit 213.
  • the arithmetic processing unit 213 receives an FB signal input from the DemiFil 214. In addition, the arithmetic processing unit 213 acquires the FW signal from the storage unit 212. Next, the arithmetic processing unit 213 acquires error data between the FB signal and the FW signal. Then, the arithmetic processing unit 213 generates a distortion compensation coefficient from the error data.
  • the arithmetic processing unit 213 calculates a distortion compensation coefficient for the transmission system having the maximum transmission power among the transmission systems belonging to the first group. Then, the arithmetic processing unit 213 outputs the distortion compensation coefficient for the transmission system having the maximum transmission power among the calculated transmission systems belonging to the first group to the group selection unit 3. Specifically, the arithmetic processing unit 213 outputs the distortion compensation coefficient to the selector 32 shown in FIG.
  • the arithmetic processing unit 213 sequentially calculates the FW signal in each transmission system belonging to the first group in a time division manner in descending order of the power fluctuation amount of the transmission system. Then, the arithmetic processing unit 213 sequentially outputs the calculated distortion compensation coefficient for each transmission system belonging to the first group to the group selection unit 3.
  • the compensation coefficient calculation unit 202 includes a fluctuation amount monitoring unit 221, a storage unit 222, an arithmetic processing unit 223, DemiFil 224, a multiplier 225, a storage unit 226, an ADC 227, and an oscillator 228.
  • the function of the compensation coefficient calculation unit 202 is controlled by a CPU different from the CPU that controls the compensation coefficient calculation unit 201.
  • the fluctuation amount monitoring unit 221 stores a power threshold for grouping transmission systems. This power threshold is the same as the power threshold stored in the fluctuation amount monitoring unit 211.
  • the fluctuation amount monitoring unit 221 receives input of transmission power of each transmission system from each power measurement unit 109 of the transmission processing unit 1 corresponding to each transmission system. Then, the fluctuation amount monitoring unit 221 acquires the transmission power of each transmission system assigned to the second group from the received transmission power of each transmission system. Next, the fluctuation amount monitoring unit 221 determines whether or not the transmission power of each transmission system assigned to the second group is greater than or equal to the power threshold. Then, the variation monitoring unit 221 selects the group selection unit 5 and the group selection so as to switch the transmission system in which the transmission power is equal to or higher than the power threshold among the transmission systems assigned to the second group to the first group. Notification to the unit 6.
  • the fluctuation amount monitoring unit 221 instructs the FW signal input SW51 and the FB signal input SW61 shown in FIG. 2 to switch the transmission system whose transmission power is equal to or greater than the power threshold to the first group. Further, the fluctuation amount monitoring unit 221 changes the compensation coefficient calculation unit 201 to switch the transmission system in which the transmission power is equal to or greater than the power threshold among the transmission systems assigned to the second group to the first group. The amount monitoring unit 211 is notified.
  • the fluctuation amount monitoring unit 221 stores the order of each transmission system assigned to the second group in descending order of power fluctuation amount. Then, the fluctuation amount monitoring unit 221 determines whether or not a large power fluctuation has occurred in the transmission power of each transmission system assigned to the second group. Here, in this embodiment, the fluctuation amount monitoring unit 221 determines that a large power fluctuation has occurred when a change occurs in the order of the power fluctuation amounts of the transmission systems assigned to the second group. Then, the fluctuation amount monitoring unit 221 changes the order of the transmission systems assigned to the second group when a large power fluctuation occurs.
  • the fluctuation amount monitoring unit 221 transmits the transmission system having the minimum transmission power among the transmission systems assigned to the second group from among the transmission systems assigned to the second group at the start of transmission and transmission power fluctuation. Is identified.
  • the FW signal from the transmission system with the minimum transmission power corresponds to an example of a “representative signal” in the second group.
  • the fluctuation amount monitoring unit 221 outputs the transmission system information with the minimum transmission power among the transmission systems assigned to the second group to the group selection unit 5. Specifically, as shown in FIG. 2, the fluctuation amount monitoring unit 221 outputs to the selector 53 information on the transmission system with the minimum transmission power among the transmission systems assigned to the second group.
  • the fluctuation amount monitoring unit 221 selects the order of each transmission system assigned to the second group with the selector 53.
  • the fluctuation amount monitoring unit 221 notifies the group selection unit 3 to switch to the transmission system assigned to the second group at the time of transmission start and transmission power fluctuation. Specifically, the fluctuation amount monitoring unit 221 notifies the distortion compensation coefficient output SW31 illustrated in FIG. 2 of an instruction to switch to the transmission system assigned to the second group. Further, the fluctuation amount monitoring unit 221 instructs the selector 33 to copy the distortion compensation coefficient received from the arithmetic processing unit 223 to the LUT 110 of the transmission processing unit 1 corresponding to the transmission system assigned to the second group.
  • the fluctuation amount monitoring unit 221 selects the order of each transmission system assigned to the second group by the selector 33.
  • the storage unit 222 is a storage device such as a memory.
  • the storage unit 222 stores the FW signal received from the group selection unit 5.
  • the storage unit 222 stores the FW signal in the transmission system with the minimum transmission power among the transmission systems belonging to the second group. Further, during stable operation, the storage unit 222 sequentially stores the FW signals in the transmission systems belonging to the second group in a time-sharing manner in descending order of the power fluctuation amount of the transmission system.
  • the ADC 227 receives the FB signal from the group selection unit 6. At the start of transmission and when the transmission power fluctuates, the ADC 227 receives the FB signal in the transmission system with the minimum transmission power among the transmission systems belonging to the second group. Further, during stable operation, the ADC 227 sequentially receives the FB signal in each transmission system belonging to the second group in the order of the power fluctuation amount of the transmission system in a time division manner. The ADC 227 converts the received FB signal, which is an analog signal, into a digital signal. Then, the ADC 227 outputs the FB signal converted into the digital signal to the storage unit 226.
  • the storage unit 226 is a storage device such as a memory.
  • the storage unit 226 stores the FB signal received from the ADC 227.
  • the multiplier 225 acquires the FB signal from the storage unit 226. Further, the oscillation clock oscillated by the oscillator 228 is acquired. Then, the multiplier 225 performs frequency conversion by multiplying the FW signal by the oscillation clock, and matches the frequency of the FB signal with the frequency of the FW signal. Thereafter, the multiplier 225 outputs the FB signal whose frequency has been converted to the DemiFil 224.
  • the DemiFil 224 receives an FB signal input from the multiplier 225. Then, DemiFil 224 performs delay adjustment on the FB signal so as to correspond to the FW signal. Then, DemiFil 224 outputs the delay adjusted FB signal to the arithmetic processing unit 223.
  • the arithmetic processing unit 223 receives an FB signal input from the DemiFil 224. In addition, the arithmetic processing unit 223 acquires the FW signal from the storage unit 222. Next, the arithmetic processing unit 223 acquires error data between the FB signal and the FW signal. Then, the arithmetic processing unit 223 generates a distortion compensation coefficient from the error data.
  • the arithmetic processing unit 223 calculates a distortion compensation coefficient for the transmission system having the minimum transmission power among the transmission systems belonging to the second group. Then, the arithmetic processing unit 223 outputs the distortion compensation coefficient for the transmission system with the minimum transmission power among the calculated transmission systems belonging to the second group to the group selection unit 3. Specifically, the arithmetic processing unit 223 outputs the distortion compensation coefficient to the selector 33 shown in FIG.
  • the arithmetic processing unit 223 sequentially calculates the FW signal in each transmission system belonging to the second group in the order of the power fluctuation amount of the transmission system in a time division manner. Then, the arithmetic processing unit 223 sequentially outputs the calculated distortion compensation coefficient for each transmission system belonging to the second group to the group selection unit 3.
  • the group selection unit 3 receives the notification of the group assigned to each transmission system from the variation monitoring unit 211 and the variation monitoring unit 221.
  • the group selection unit 3 switches the connection of each transmission system to the compensation coefficient calculation unit 201 or the compensation coefficient calculation unit 202 according to the received group assignment.
  • the group selection unit 3 includes a distortion compensation coefficient output SW31, a selector 32, and a selector 33 shown in FIG.
  • the distortion compensation coefficient output SW31 has a switch for selectively connecting a distortion compensation coefficient output source for each transmission system, either the compensation coefficient calculation unit 201 or the compensation coefficient calculation unit 202, for each transmission system. is doing.
  • the selector 32 receives from the arithmetic processing unit 213 the input of the distortion compensation coefficient of the transmission system having the maximum transmission power of the first group.
  • the selector 32 receives an instruction from the variation monitoring unit 211 to copy the distortion compensation coefficient to the transmission LUT 110 belonging to the first group. Then, the selector 32 transmits the distortion compensation coefficient of the transmission system having the maximum transmission power of the first group to each LUT 110 of the transmission system belonging to the first group via the distortion compensation coefficient output SW31.
  • the selector 32 receives the order of each transmission system belonging to the first group from the fluctuation amount monitoring unit 211 of the compensation coefficient calculation unit 201.
  • the order of each transmission system is the order in which the amount of power fluctuation is large, as will be described later.
  • the selector 32 outputs the distortion compensation coefficient received from the arithmetic processing unit 213 to the LUTs 110 of the transmission systems belonging to the first group via the distortion compensation coefficient output SW31 in a time division manner in accordance with the designation of the transmission system order. .
  • the selector 33 receives an input of the distortion compensation coefficient of the transmission system having the minimum transmission power of the second group from the arithmetic processing unit 223.
  • the selector 33 receives an instruction from the variation monitoring unit 221 to copy the distortion compensation coefficient to the transmission LUT 110 belonging to the second group.
  • the selector 33 transmits the distortion compensation coefficient of the transmission system having the minimum transmission power of the second group to each LUT 110 of the transmission system belonging to the second group via the distortion compensation coefficient output SW31.
  • the selector 33 receives the order of each transmission system belonging to the second group from the fluctuation amount monitoring unit 221 of the compensation coefficient calculating unit 202.
  • the order of each transmission system is the order in which the amount of power fluctuation is large, as will be described later.
  • the selector 33 outputs the distortion compensation coefficient received from the arithmetic processing unit 223 to the LUTs 110 of the transmission systems belonging to the second group via the distortion compensation coefficient output SW31 in a time division manner in accordance with the designation of the transmission system order. .
  • the distortion compensation coefficient output SW31 switches the connection in response to an instruction from the fluctuation amount monitoring units 211 and 221. For example, a case where an instruction is given from the fluctuation amount monitoring unit 211 to allocate the transmission 1 system as the output destination of the compensation coefficient calculation unit 201 will be described. In this case, the distortion compensation coefficient output SW31 is transmitted 1 so that the input path of the distortion compensation coefficient received from the compensation coefficient calculation unit 201 via the selector 32 is connected to the LUT 110 of the transmission processing unit 1 corresponding to the transmission 1 system. Switch the switch corresponding to the system.
  • the distortion compensation coefficient output SW31 outputs the distortion compensation coefficient input from the selector 32 to the transmission system LUT 110 belonging to the first group.
  • the distortion compensation coefficient output SW31 outputs the distortion compensation coefficient input from the selector 33 to the transmission system LUT 110 belonging to the second group.
  • FIG. 8 is a flowchart of the distortion compensation operation at the start of transmission in the distortion compensation circuit according to the first embodiment.
  • a system in which the distortion compensation coefficient for the first group is calculated by the selector 32, the selector 52, the selector 62, and the compensation coefficient calculation unit 201 is referred to as a DPD1 system.
  • a system in which the distortion compensation coefficient for the second group is calculated by the selector 33, the selector 53, the selector 63, and the compensation coefficient calculation unit 202 is referred to as a DPD2 system.
  • DPD1 system a system in which the distortion compensation coefficient for the second group is calculated by the selector 33, the selector 53, the selector 63, and the compensation coefficient calculation unit 202 is referred to as a DPD2 system.
  • the flow on the left side of the alternate long and short dash line toward the paper surface represents processing by the DPD1 system
  • the flow on the right side of the alternate long and short dashed line toward the paper surface represents processing by the DPD2 system.
  • a dotted arrow extending from the DPD1 system flow to the DPD2 system flow indicates transmission of a signal from the DPD1 system to the DPD2 system at the timing of the flow.
  • the fluctuation amount monitoring unit 211 acquires the transmission power values of all transmission systems from the power measurement unit 109 of each transmission system (step S101).
  • the fluctuation amount monitoring unit 211 identifies one transmission system as a grouping target from among transmission systems that are not grouped. Then, the fluctuation amount monitoring unit 211 determines whether or not the transmission power of the identified transmission system is greater than or equal to the power threshold (step S102). If it is equal to or greater than the power threshold (step S102: affirmative), the fluctuation amount monitoring unit 211 instructs the group selection unit 5 and the group selection unit 6 to switch the transmission system to connection to the DPD1 system. In response to the instruction from the fluctuation amount monitoring unit 211, the group selection unit 5 and the group selection unit 6 switch the transmission system to connection to the DPD1 system (step S103). Furthermore, the fluctuation amount monitoring unit 211 groups the transmission system into the first group and stores it as a transmission system belonging to the first group (step S104).
  • the fluctuation amount monitoring unit 211 instructs the group selection unit 5 and the group selection unit 6 to switch the transmission system to connection to the DPD2 system.
  • the group selection unit 5 and the group selection unit 6 switch the transmission system to connection to the DPD2 system (step S105). Further, the fluctuation amount monitoring unit 211 divides the transmission system into the second group, and stores it as a transmission system belonging to the second group notified to the DPD2 system (step S106).
  • the fluctuation amount monitoring unit 211 determines whether or not grouping of all transmission systems has been completed (step S107). If not completed (No at Step S107), the fluctuation amount monitoring unit 211 returns to Step S102.
  • step S107 when the grouping of all transmission systems is completed (step S107: affirmative), the fluctuation amount monitoring unit 211 notifies the fluctuation amount monitoring unit 221 of the DPD2 system of completion of grouping (step S108). At this time, the fluctuation amount monitoring unit 211 also transmits information on transmission systems belonging to the second group to the fluctuation amount monitoring unit 221.
  • the distortion compensation calculation unit 102 of the transmission system belonging to the first group copies the training value from the training value storage unit 4 (step S109).
  • the transmission processing unit 1 of the transmission system belonging to the first group performs distortion compensation using the training value and outputs a transmission signal.
  • the fluctuation amount monitoring unit 211 detects the transmission system having the maximum transmission power from the transmission systems belonging to the first group (step S110).
  • the fluctuation amount monitoring unit 211 instructs the selector 52 and the selector 62 to select the transmission system with the maximum transmission power detected, and switches to the transmission system with the maximum transmission power detected by the selection of the selector 52 and the selector 62 ( Step S111).
  • the arithmetic processing unit 213 receives the FW signal and the FB signal of the transmission system having the maximum transmission power of the first group. Then, the arithmetic processing unit 213 calculates a distortion compensation coefficient for the transmission system having the maximum transmission power of the first group (step S112).
  • the fluctuation amount monitoring unit 211 notifies the group selection unit 3 of an instruction to turn on the route to the transmission system allocated to the own system, that is, the transmission system belonging to the first group.
  • the group selection unit 3 turns on the path connecting the DPD1 system and the transmission system belonging to the first group (step S113).
  • the arithmetic processing unit 213 copies the calculated distortion compensation coefficient to the LUT 110 of the transmission system belonging to the first group via the group selection unit 3 (step S114).
  • the fluctuation amount monitoring unit 221 determines whether the grouping is completed (step S121). When the grouping is not completed (No at Step S121), the fluctuation amount monitoring unit 221 waits until receiving a grouping completion notification from the DPD1 system.
  • the fluctuation amount monitoring unit 221 displays information on the transmission systems belonging to the second group. Received from the DPD1 system and stored. Then, the distortion compensation calculation unit 102 of the transmission system belonging to the second group copies the training value from the training value storage unit 4 (step S122). The transmission processing unit 1 of the transmission system belonging to the second group performs distortion compensation using the training value and outputs a transmission signal.
  • the fluctuation amount monitoring unit 221 searches for the transmission system with the minimum transmission power from the transmission systems belonging to the second group (step S123).
  • the fluctuation amount monitoring unit 221 instructs the selector 53 and the selector 63 to select the transmission system with the detected minimum transmission power, and switches the transmission system with the detected minimum transmission power to the selection of the selector 53 and the selector 63 ( Step S124).
  • the arithmetic processing unit 223 receives the FW signal and the FB signal of the transmission system with the minimum transmission power of the second group. Then, the arithmetic processing unit 223 calculates a distortion compensation coefficient for the transmission system having the minimum transmission power of the second group (step S125).
  • the fluctuation amount monitoring unit 221 notifies the group selection unit 3 of an instruction to turn on the route to the transmission system allocated to the own system, that is, the transmission system belonging to the second group.
  • the group selection unit 3 turns on the path connecting the DPD2 system and the transmission system belonging to the second group (step S126).
  • the arithmetic processing unit 223 copies the calculated distortion compensation coefficient to the LUT 110 of the transmission system belonging to the second group via the group selection unit 3 (step S127).
  • FIG. 9 is a flowchart of the distortion compensation operation when the transmission power fluctuates in the DPD1 system of the distortion compensation circuit according to the first embodiment.
  • FIG. 10 is a flowchart of the distortion compensation operation when the transmission power fluctuates in the DPD2 system of the distortion compensation circuit according to the first embodiment.
  • FIG. 11 is a flowchart of interrupt processing in the DPD1 system when the transmission power of the distortion compensation circuit according to the first embodiment varies.
  • the fluctuation amount monitoring unit 211 acquires the transmission power of the transmission system assigned to the own system, that is, the transmission system belonging to the first group, from the power measurement unit 109 of each transmission system (step S201).
  • the fluctuation amount monitoring unit 211 determines whether there is a transmission system in which the transmission power is less than the power threshold (step S202). When there is no transmission system in which the transmission power is less than the power threshold (No at Step S202), the fluctuation amount monitoring unit 211 proceeds to Step S207.
  • step S202 when there is a transmission system in which the transmission power is less than the power threshold (step S202: Yes), the fluctuation amount monitoring unit 211 connects the transmission system in which the transmission power is less than the power threshold to the DPD2 system.
  • the group selection unit 5 and the group selection unit 6 are instructed to switch.
  • the group selection unit 5 and the group selection unit 6 switch the transmission system whose transmission power is less than the power threshold to connection to the DPD2 system (step S203).
  • the fluctuation amount monitoring unit 211 removes the transmission system whose transmission power is less than the threshold from the stored first group, and changes the group to which it belongs (step S204).
  • the fluctuation amount monitoring unit 211 notifies the DPD2 system of group reorganization that the transmission system group whose transmission power is less than the threshold has been changed (step S205).
  • the fluctuation amount monitoring unit 211 changes the order of the power fluctuation amount order of the transmission systems of the first group stored by itself, and rearranges the order of the transmission systems that perform distortion compensation processing during stable operation (step S206). ).
  • the fluctuation amount monitoring unit 211 acquires the power amount from the power measurement unit 109 of each transmission system belonging to the first group, and monitors the power fluctuation amount (step S207).
  • the fluctuation amount monitoring unit 211 determines whether or not a large power fluctuation has occurred (step S208). When there is no large power fluctuation (No at Step S208), the fluctuation amount monitoring unit 211 determines that the operation is stable. Then, the fluctuation amount monitoring unit 211 sequentially switches the route to the transmission system assigned to the own system, that is, the transmission system belonging to the first group, by switching the selector 32 in the order of the stored transmission routes. (Step S209). At this time, in accordance with the path switching, the arithmetic processing unit 213 transmits the distortion compensation coefficient of each transmission system to the corresponding LUT 110 of the transmission system.
  • the transmission processing unit 1 of the transmission system belonging to the first group sequentially performs distortion compensation processing using the distortion compensation coefficient received from the arithmetic processing unit 213 (step S210).
  • step S208 if there is a large power fluctuation (step S208: affirmative), the fluctuation amount monitoring unit 211 changes the order of the power fluctuation amount order of the transmission system of the first group stored by itself and distorts during stable operation. The order of transmission systems for performing compensation processing is rearranged (step S211).
  • the fluctuation amount monitoring unit 211 detects the transmission system with the maximum transmission power from the transmission systems belonging to the first group (step S212).
  • the fluctuation amount monitoring unit 211 instructs the selector 52 and the selector 62 to select the transmission system with the maximum transmission power detected, and switches to the transmission system with the maximum transmission power detected by the selection of the selector 52 and the selector 62 ( Step S213).
  • the arithmetic processing unit 213 receives the FW signal and the FB signal of the transmission system having the maximum transmission power of the first group. Then, the arithmetic processing unit 213 calculates a distortion compensation coefficient for the transmission system having the maximum transmission power of the first group (step S214).
  • the fluctuation amount monitoring unit 211 notifies the group selection unit 3 of an instruction to turn on the route to the transmission system allocated to the own system, that is, the transmission system belonging to the first group.
  • the group selection unit 3 turns on the path connecting the DPD1 system and the transmission system belonging to the first group (step S215).
  • the arithmetic processing unit 213 copies the calculated distortion compensation coefficient to the LUT 110 of the transmission system belonging to the first group via the group selection unit 3 (step S216).
  • the fluctuation amount monitoring unit 221 acquires the transmission power of the transmission system assigned to the own system, that is, the transmission system belonging to the second group, from the power measurement unit 109 of each transmission system (step S301).
  • the fluctuation amount monitoring unit 221 determines whether there is a transmission system in which the transmission power is equal to or greater than the power threshold (step S302). When there is no transmission system in which the transmission power is equal to or greater than the power threshold (No at Step S302), the fluctuation amount monitoring unit 221 proceeds to Step S307.
  • step S302 when there is a transmission system in which the transmission power is equal to or higher than the power threshold (step S302: Yes), the fluctuation amount monitoring unit 221 connects the transmission system whose transmission power is equal to or higher than the power threshold to the DPD1 system
  • the group selection unit 5 and the group selection unit 6 are instructed to switch.
  • the group selection unit 5 and the group selection unit 6 switch the transmission system whose transmission power is equal to or greater than the power threshold to connection to the DPD1 system (step S303).
  • the fluctuation amount monitoring unit 221 removes the transmission system whose transmission power is equal to or greater than the threshold from the stored second group, and changes the group to which it belongs (step S304).
  • the fluctuation amount monitoring unit 221 notifies the DPD1 system of the group reorganization that the transmission system group whose transmission power is equal to or greater than the threshold value has been changed (step S305).
  • the fluctuation amount monitoring unit 221 changes the order of the power fluctuation amount order of the transmission systems of the second group stored by itself, and rearranges the order of the transmission systems that perform distortion compensation processing during stable operation (step S306). ).
  • the fluctuation amount monitoring unit 221 acquires the power amount from the power measurement unit 109 of each transmission system belonging to the second group, and monitors the power fluctuation amount (step S307).
  • the fluctuation amount monitoring unit 221 determines whether or not there has been a large power fluctuation (step S308). If there is no large power fluctuation (No at Step S308), the fluctuation amount monitoring unit 221 determines that the operation is stable. Then, the fluctuation amount monitoring unit 221 sequentially switches the transmission system assigned to the own system, that is, the path to the transmission system belonging to the second group, by switching the selector 33 in the order of the stored transmission paths. (Step S309). At this time, in accordance with the path switching, the arithmetic processing unit 223 transmits the distortion compensation coefficient of each transmission system to the LUT 110 of the corresponding transmission system.
  • the transmission processing unit 1 of the transmission system belonging to the second group sequentially performs distortion compensation processing using the distortion compensation coefficient received from the arithmetic processing unit 223 (step S310).
  • step S308 affirmative
  • the fluctuation amount monitoring unit 221 changes the order of the power fluctuation amount of the transmission system of the second group stored by itself and distorts during stable operation.
  • the order of transmission systems for performing compensation processing is rearranged (step S311).
  • the fluctuation amount monitoring unit 221 detects the transmission system with the minimum transmission power from the transmission systems belonging to the second group (step S312).
  • the fluctuation amount monitoring unit 221 instructs the selector 53 and the selector 63 to select the transmission system with the detected minimum transmission power, and switches the transmission system with the detected minimum transmission power to the selection of the selector 53 and the selector 63 ( Step S313).
  • the arithmetic processing unit 223 receives the FW signal and the FB signal of the transmission system with the minimum transmission power of the second group. Then, the arithmetic processing unit 223 calculates a distortion compensation coefficient for the transmission system with the minimum transmission power of the second group (step S314).
  • the fluctuation amount monitoring unit 221 notifies the group selection unit 3 of an instruction to turn on the route to the transmission system allocated to the own system, that is, the transmission system belonging to the second group.
  • the group selection unit 3 turns on the path connecting the DPD2 system and the transmission system belonging to the second group (step S315).
  • the arithmetic processing unit 223 copies the calculated distortion compensation coefficient to the LUT 110 of the transmission system belonging to the second group via the group selection unit 3 (step S316).
  • the DPD1 system starts this interrupt process using the notification in step S305 in the flow when the transmission power fluctuates in the DPD2 system of FIG. 10 as a trigger.
  • the fluctuation amount monitoring unit 211 receives the notification from the fluctuation amount monitoring unit 221 of the DPD2 system, the group selection unit 3, so as to switch the new transmission system of the first group whose group has been changed to the connection to the own system.
  • the group selection unit 5 and the group selection unit 6 are instructed.
  • the group selection unit 3, the group selection unit 5, and the group selection unit 6 switch the new transmission system of the first group to the connection to the DPD1 system (step S401).
  • the arithmetic processing unit 213 copies the distortion compensation coefficient of the transmission system having the maximum transmission power in the first group to the LUT 110 of the new transmission system of the first group via the group selection unit 3 (step S402).
  • the distortion compensation circuit divides a transmission system into two groups based on transmission power, determines a representative transmission system in each group, and performs distortion compensation in the transmission system. The coefficient is obtained and copied to another transmission system in the same group. Then, the distortion compensation circuit performs distortion compensation for each transmission system using the copied distortion compensation coefficient. That is, the distortion compensation coefficient is calculated only once for each group, and the distortion compensation coefficient is calculated using a different CPU, so that the distortion compensation processing can be performed quickly.
  • the distortion pull-in time at the start of transmission and when the transmission power fluctuates can be shortened. That is, all transmission system distortions can be stabilized in a short time.
  • the circuit scale can be reduced.
  • the distortion compensation coefficient unique to each transmission system is calculated and distortion compensation is performed for each transmission system. Compensation can be performed.
  • stable operation when stable operation is performed, large distortion is unlikely to occur, and therefore unnecessary waves are generated even if it takes time to perform appropriate distortion compensation for individual transmission systems thereafter. There are few, and a problem does not occur.
  • FIG. 12 is a block diagram of a distortion compensation circuit according to the second embodiment.
  • the distortion compensation circuit according to the present embodiment performs distortion compensation for the transmission system belonging to the other group in both the DPD1 system and the DPD2 system when there is no transmission system belonging to one group. Is different.
  • the distortion compensation circuit according to the present embodiment has a configuration in which bias power monitoring units 219 and 229 are added to the compensation coefficient calculation units 201 and 202 in the block diagram of FIG. 12, parts having the same reference numerals as those in FIG. 1 have the same functions unless otherwise specified.
  • the state where distortion compensation is performed for the transmission system belonging to the other group in both the DPD1 system and the DPD2 system is referred to as a “bias power mode”.
  • a state in which distortion compensation is performed on the transmission system belonging to the first group in the DPD1 system and distortion compensation is performed on the transmission system belonging to the second group in the DPD2 system is referred to as “normal mode”.
  • the fluctuation amount monitoring unit 211 notifies the bias power monitoring unit 219 of the transmission system information assigned to the first group at the start of transmission.
  • the fluctuation amount monitoring unit 211 notifies the bias power monitoring unit 219 of the transmission system information in which the group has been changed. .
  • the fluctuation amount monitoring unit 211 moves to the bias power mode together with information on the transmission system that has switched the path to the DPD2 system.
  • the notification is received from the partial power monitoring unit 219.
  • the fluctuation amount monitoring unit 211 detects the transmission system having the maximum transmission power from the transmission systems other than the transmission system whose path has been switched, and instructs the selector 52 and the selector 62 to select the transmission system detected.
  • the fluctuation amount monitoring unit 211 notifies the selector 32 to copy the distortion compensation coefficient to a transmission system other than the transmission system whose path has been switched.
  • the DPD1 system performs distortion compensation for transmission systems other than the transmission system whose path is switched.
  • the fluctuation amount monitoring unit 211 receives from the partial power monitoring unit 219 a notification of transition to the partial power mode together with information on the transmission system whose path has been switched to the DPD1 system. Then, the fluctuation amount monitoring unit 211 detects the transmission system with the minimum transmission power from the transmission systems whose paths are switched to the DPD1 system, and instructs the selector 52 and the selector 62 to select the transmission system detected. Further, the fluctuation amount monitoring unit 211 notifies the selector 32 to copy the distortion compensation coefficient to the transmission system whose path is switched to the DPD1 system. Thereby, in the partial power mode when the assignment to the first group becomes 0, the DPD1 system performs distortion compensation for the transmission system whose path is switched to the own system.
  • the uneven power monitoring unit 219 acquires information on the transmission system assigned to the first group from the fluctuation amount monitoring unit 211 at the start of transmission. Thereafter, the bias power monitoring unit 219 receives the notification of the transmission system group change from the fluctuation amount monitoring unit 211, and removes the transmission system whose group has been changed from the stored transmission systems belonging to the first group. Then, the bias power monitoring unit 219 determines whether there is a transmission system belonging to the first group.
  • the bias power monitoring unit 219 notifies the bias power monitoring unit 229 of the compensation coefficient calculation unit 202 of the allocation 0 to the first group when the allocation to the first group becomes zero. Thereafter, the bias power monitoring unit 219 receives from the fluctuation amount monitoring unit 221 a notification of transition to the bias power mode together with information on the transmission systems that are half of the transmission systems belonging to the second group whose path has been switched to the own system. Then, the uneven power monitoring unit 219 notifies the fluctuation amount monitoring unit 211 of the shift to the uneven power mode together with information on the transmission system whose path has been switched to the own system.
  • the partial power monitoring unit 219 when the partial power monitoring unit 219 receives the notification of allocation 0 in the second group from the partial power monitoring unit 229 of the compensation coefficient calculation unit 202, the partial power monitoring unit 219 confirms the shift to the partial power mode. Thereafter, the bias power monitoring unit 219 selects a transmission system belonging to the first group, that is, a transmission system that is half of all the transmission systems. Then, the bias power monitoring unit 219 notifies the group selection unit 3, the group selection unit 5, and the group selection unit 6 to switch the input / output path of the selected transmission system to the connection to the DPD1 system. Then, the uneven power monitoring unit 219 notifies the uneven power monitoring unit 229 that the selected transmission path has been switched. In addition, the uneven power monitoring unit 219 notifies the fluctuation amount monitoring unit 211 of the shift to the uneven power mode together with information on the transmission system whose path has been switched.
  • the fluctuation amount monitoring unit 221 and the deviation power monitoring unit 229 in the compensation coefficient calculation unit 202 are the same as the fluctuation amount monitoring unit 211 and the deviation power monitoring unit 219 except that the first group and the second group are reversed. Perform the operation.
  • FIG. 13A is a schematic diagram illustrating grouping and connection of transmission systems in the normal mode.
  • FIG. 13B is a schematic diagram illustrating grouping and connection of transmission systems in the bias power mode.
  • the case where the allocation to the first group becomes 0 will be described.
  • the transmission system in which the transmission power is included in the range 610 of the maximum transmission power 601 or less and the power threshold value 602 or more is a transmission system belonging to the first group.
  • two systems, a transmission T1 system and a transmission T2 system are in the range 610 and are connected to the DPD1 system.
  • T1 and T2 are natural numbers of 1 or more and n or less.
  • a transmission system in which transmission power is included in a range 611 that is less than the power threshold 602 and is equal to or greater than the minimum transmission power 603 is a transmission system that belongs to the second group.
  • n ⁇ 2 systems from transmission T3 system to transmission Tn system are in the range 611 and are connected to the DPD2 system.
  • T3 to Tn are natural numbers of 1 to n excluding T1 and T2.
  • the number of transmission systems connected to the DPD1 system may be unbalanced from the number of transmission systems connected to the DPD2 system.
  • the transmission T1 system and the transmission T2 system are switched to the second group, and the allocation of the first group becomes zero.
  • n / 2 transmission systems T1-Tn / 2 systems are connected to the DPD1 system.
  • n / 2 transmission systems of transmission Tn / 2 + 1 to n systems are connected to the DPD2 system.
  • FIG. 14 is a flowchart of the operation at the time of switching from the normal mode to the bias power mode.
  • a case where the first group assignment is 0 will be described.
  • the flow on the left side of the alternate long and short dash line toward the paper surface of FIG. 14 is a flow of the operation of the DPD1 system.
  • the flow on the right side of the alternate long and short dash line toward the paper surface is an operation flow of the DPD2 system.
  • the fluctuation amount monitoring unit 211 acquires the transmission power of the transmission system assigned to the own system, that is, the transmission system belonging to the first group, from the power measurement unit 109 of each transmission system (step S501).
  • the fluctuation amount monitoring unit 211 determines whether there is a transmission system in which the transmission power is less than the power threshold (step S502). When there is no transmission system in which the transmission power is less than the power threshold (No at Step S502), the fluctuation amount monitoring unit 211 proceeds to Step S512.
  • step S502 when there is a transmission system in which the transmission power is less than the power threshold (step S502: Yes), the fluctuation amount monitoring unit 211 changes the transmission system in which the transmission power is less than the power threshold to the connection to the DPD2 system.
  • the group selection unit 5 and the group selection unit 6 are instructed to switch.
  • the group selection unit 5 and the group selection unit 6 switch the transmission system whose transmission power is less than the power threshold to the connection to the DPD2 system (step S503).
  • the uneven power monitoring unit 219 determines whether the switched transmission system is the last one belonging to the first group (step S504). In the case of the last system 1 (step S504: Yes), the partial power monitoring unit 219 notifies the DPD2 system of the first group allocation 0 (step S505).
  • the bias power monitoring unit 219 determines whether or not the switching of the connection of the half of the transmission systems belonging to the second group to the own system has been completed (step S506). If the switching has not been completed (No at Step S506), the partial power monitoring unit 219 waits until receiving a notification from the DPD2 system.
  • step S506 affirmative
  • the uneven power monitoring unit 219 notifies the fluctuation amount monitoring unit 211 of the shift to the uneven power mode, and turns on the uneven power mode (step S507).
  • the compensation coefficient calculation unit 201 performs an operation in the bias power mode (step S508).
  • step S504 when it is not the last one system (step S504: No), the fluctuation amount monitoring unit 211 removes the transmission system whose transmission power is less than the threshold from the stored first group and changes the group to which it belongs. (Step S509).
  • the fluctuation amount monitoring unit 211 notifies the DPD2 system of group reorganization that the transmission system group whose transmission power is less than the threshold has been changed (step S510).
  • the fluctuation amount monitoring unit 211 changes the order of the power fluctuation amount order of the transmission system of the first group stored in itself, and rearranges the order of the transmission system performing the distortion compensation processing during the stable operation (step S511). ).
  • the fluctuation amount monitoring unit 211 acquires the power amount from the power measurement unit 109 of each transmission system belonging to the first group, and monitors the power fluctuation amount (step S512).
  • the fluctuation amount monitoring unit 211 determines whether or not a large power fluctuation has occurred (step S513). When there is no large power fluctuation (No at Step S513), the fluctuation amount monitoring unit 211 determines that the operation is stable. Then, the fluctuation amount monitoring unit 211 sequentially switches the route to the transmission system assigned to the own system, that is, the transmission system belonging to the first group, by switching the selector 32 in the order of the stored transmission routes. (Step S514). At this time, in accordance with the path switching, the arithmetic processing unit 213 transmits the distortion compensation coefficient of each transmission system to the corresponding LUT 110 of the transmission system.
  • the transmission processing unit 1 of the transmission system belonging to the first group sequentially performs distortion compensation processing using the distortion compensation coefficient received from the arithmetic processing unit 213 (step S515).
  • step S513 when there is a large power fluctuation (step S513: affirmative), the fluctuation amount monitoring unit 211 changes the order of the power fluctuation amount order of the transmission system of the first group stored by itself and distorts during stable operation. The order of the transmission systems performing the compensation process is rearranged (step S516).
  • the fluctuation amount monitoring unit 211 detects the transmission system having the maximum transmission power from among the transmission systems belonging to the first group (step S517).
  • the fluctuation amount monitoring unit 211 instructs the selector 52 and the selector 62 to select the transmission system with the maximum transmission power detected, and switches to the transmission system with the maximum transmission power detected by the selection of the selector 52 and the selector 62 ( Step S518).
  • the arithmetic processing unit 213 receives the FW signal and the FB signal of the transmission system having the maximum transmission power of the first group. Then, the arithmetic processing unit 213 calculates a distortion compensation coefficient for the transmission system having the maximum transmission power of the first group (step S519).
  • the fluctuation amount monitoring unit 211 notifies the group selection unit 3 of an instruction to turn on the route to the transmission system allocated to the own system, that is, the transmission system belonging to the first group.
  • the group selection unit 3 turns on the path connecting the DPD1 system and the transmission system belonging to the first group (step S520).
  • the arithmetic processing unit 213 copies the calculated distortion compensation coefficient to the LUT 110 of the transmission system belonging to the first group via the group selection unit 3 (step S521).
  • the fluctuation amount monitoring unit 221 instructs the group selection unit 5 and the group selection unit 6 to connect the new transmission system assigned to the second group to the own system.
  • the group selection unit 5 and the group selection unit 6 switch the new transmission system to the connection to the DPD2 system (step S551).
  • the arithmetic processing unit 223 copies the distortion compensation coefficient of the transmission system with the minimum transmission power in the second group to the LUT 110 of the new transmission system of the second group via the group selection unit 3 (step S552).
  • the uneven power monitoring unit 229 switches half of the transmission systems belonging to the second group to the connection to the DPD1 system (step S553).
  • the uneven power monitoring unit 229 notifies the DPD1 system that half the transmission systems have been allocated (step S554).
  • the uneven power monitoring unit 229 notifies the fluctuation amount monitoring unit 221 of the shift to the uneven power mode, and turns on the uneven power mode (step S555).
  • the compensation coefficient calculation unit 202 performs an operation in the bias power mode (step S556).
  • FIG. 15 is a flowchart of the operation in the biased power mode of the DPD1 system when the first group assignment becomes zero.
  • the fluctuation amount monitoring unit 211 acquires the power amount from the power measurement unit 109 of each transmission system assigned to the own system, and monitors the power fluctuation amount (step S601).
  • the fluctuation amount monitoring unit 211 determines whether or not there is a large power fluctuation (step S602). When there is no large power fluctuation (No at Step S602), the fluctuation amount monitoring unit 211 determines that the operation is stable. Then, the fluctuation amount monitoring unit 211 sequentially switches the transmission path allocated to the own system by switching the selector 32 in the order of the stored transmission paths (step S603). At this time, in accordance with the path switching, the arithmetic processing unit 213 transmits the distortion compensation coefficient of each transmission system to the corresponding LUT 110 of the transmission system.
  • the transmission processing unit 1 of the transmission system assigned to the DPD1 system sequentially performs distortion compensation processing using the distortion compensation coefficient received from the arithmetic processing unit 213 (step S604).
  • step S602 when there is a large power fluctuation (step S602: affirmative), the fluctuation amount monitoring unit 211 changes the order of the power fluctuation amount of the transmission system assigned to the own system stored by itself and operates stably. The order of the transmission systems that sometimes perform distortion compensation processing is rearranged (step S605).
  • the fluctuation amount monitoring unit 211 detects the transmission system with the minimum transmission power from the transmission systems assigned to the own system (step S606).
  • the fluctuation amount monitoring unit 211 instructs the selector 52 and the selector 62 to select the transmission system with the minimum transmission power detected, and switches to the transmission system with the minimum transmission power detected by the selection of the selector 52 and the selector 62 ( Step S607).
  • the arithmetic processing unit 213 receives the FW signal and the FB signal of the transmission system with the minimum transmission power among the transmission systems allocated to the own system. Then, the arithmetic processing unit 213 calculates a distortion compensation coefficient for the transmission system with the minimum transmission power (step S608).
  • the fluctuation amount monitoring unit 211 notifies the group selection unit 3 of an instruction to turn on the route to the transmission system allocated to the own system. In response to the instruction from the fluctuation amount monitoring unit 211, the group selection unit 3 turns on the path connecting the DPD1 system and the transmission system assigned to the DPD1 system (step S609).
  • the arithmetic processing unit 213 copies the calculated distortion compensation coefficient to the LUT 110 of the transmission system assigned to the own system via the group selection unit 3 (step S610).
  • FIG. 16 is a flowchart of the operation when returning from the bias power mode to the normal mode.
  • the flow on the left side of the alternate long and short dash line in the drawing of FIG. 16 is a flow of the operation of the DPD2 system. Further, the flow on the right side of the alternate long and short dash line toward the paper surface is an operation flow of the DPD1 system.
  • the fluctuation amount monitoring unit 221 acquires, from the power measurement unit 109 of each transmission system, the transmission power of not only the transmission system assigned to the own system but also all transmission systems including the transmission system assigned to the DPD1 system (step). S701).
  • the fluctuation amount monitoring unit 221 determines whether there is a transmission system in which the transmission power is equal to or greater than the power threshold (step S702). When there is no transmission system in which the transmission power is equal to or greater than the power threshold (No at Step S702), the fluctuation amount monitoring unit 221 proceeds to Step S709.
  • step S702 when there is a transmission system in which the transmission power is equal to or greater than the power threshold (step S702: Yes), the fluctuation amount monitoring unit 221 connects the transmission system assigned to the DPD1 system in the uneven power mode to the own system.
  • the group selection unit 5 and the group selection unit 6 are instructed to switch to The group selection unit 5 and the group selection unit 6 switch the transmission system assigned to the DPD1 system in the bias power mode to the connection of the DPD2 system (step S703).
  • the fluctuation amount monitoring unit 221 instructs the group selection unit 5 and the group selection unit 6 to switch the transmission system whose transmission power is equal to or greater than the power threshold value to the connection to the DPD1 system.
  • the group selection unit 5 and the group selection unit 6 switch the transmission system whose transmission power is equal to or higher than the power threshold to connection to the DPD1 system (step S704).
  • the fluctuation amount monitoring unit 221 removes the transmission system whose transmission power is equal to or greater than the threshold from the stored second group, and changes the group to which it belongs (step S705).
  • the fluctuation amount monitoring unit 221 notifies the DPD1 system of the group reorganization that the transmission system group whose transmission power is equal to or greater than the threshold value has been changed (step S706).
  • the fluctuation amount monitoring unit 221 changes the order of the power fluctuation amount order of the transmission systems of the second group stored by itself, and rearranges the order of the transmission systems that perform distortion compensation processing during stable operation (step S707). ). Then, the fluctuation amount monitoring unit 221 turns off the bias power mode (step S708).
  • the fluctuation amount monitoring unit 221 acquires the power amount from the power measurement unit 109 of each transmission system belonging to the second group, and monitors the power fluctuation amount (step S709).
  • the fluctuation amount monitoring unit 221 determines whether or not there has been a large power fluctuation (step S710). When there is no large power fluctuation (No at Step S710), the fluctuation amount monitoring unit 221 determines that the operation is stable. Then, the fluctuation amount monitoring unit 221 sequentially switches the transmission system assigned to the own system, that is, the path to the transmission system belonging to the second group, by switching the selector 33 in the order of the stored transmission paths. (Step S711). At this time, in accordance with the path switching, the arithmetic processing unit 223 transmits the distortion compensation coefficient of each transmission system to the LUT 110 of the corresponding transmission system.
  • the transmission processing unit 1 of the transmission system belonging to the second group sequentially performs distortion compensation processing using the distortion compensation coefficient received from the arithmetic processing unit 223 (step S712).
  • step S710 when there is a large power fluctuation (step S710: affirmative), the fluctuation amount monitoring unit 221 changes the order of the power fluctuation amount of the transmission system of the second group stored by itself and distorts during stable operation.
  • the order of transmission systems for performing compensation processing is rearranged (step S713).
  • the fluctuation amount monitoring unit 221 detects the transmission system with the minimum transmission power from the transmission systems belonging to the second group (step S714).
  • the fluctuation amount monitoring unit 221 instructs the selector 53 and the selector 63 to select the transmission system with the detected minimum transmission power, and switches the transmission system with the detected minimum transmission power to the selection of the selector 53 and the selector 63 ( Step S715).
  • the arithmetic processing unit 223 receives the FW signal and the FB signal of the transmission system with the minimum transmission power of the second group. Then, the arithmetic processing unit 223 calculates a distortion compensation coefficient for the transmission system with the minimum transmission power of the second group (step S716).
  • the fluctuation amount monitoring unit 221 notifies the group selection unit 3 of an instruction to turn on the route to the transmission system allocated to the own system, that is, the transmission system belonging to the second group.
  • the group selection unit 3 turns on the path connecting the DPD2 system and the transmission system belonging to the second group (step S717).
  • the arithmetic processing unit 223 copies the calculated distortion compensation coefficient to the LUT 110 of the transmission system belonging to the second group via the group selection unit 3 (step S718).
  • the fluctuation amount monitoring unit 211 determines whether or not there are a plurality of transmission systems assigned to the first group (step S751).
  • step S751 When the number of assigned transmission systems is one (step S751: No), the fluctuation amount monitoring unit 211 selects the group so as to turn on the path for transmitting the distortion compensation coefficient to the new transmission system assigned to the first group. Instruct part 3. The group selection unit 3 turns on the path from the DPD1 system to the new transmission system (step S752).
  • the transmission processing unit 1 uses the distortion compensation coefficient calculated by the arithmetic processing unit 213 to perform distortion compensation processing for the first group of new transmission systems (step S753).
  • step S751 when there are a plurality of assigned transmission systems (step S751: affirmative), the fluctuation amount monitoring unit 211 changes the order of the power fluctuation amount of the transmission system of the first group stored by itself and operates stably. The order of the transmission systems that sometimes perform distortion compensation processing is rearranged (step S754).
  • the fluctuation amount monitoring unit 211 detects the transmission system with the maximum transmission power from the transmission systems belonging to the first group (step S755).
  • the fluctuation amount monitoring unit 211 instructs the selector 52 to select the transmission system having the maximum transmission power detected, and switches to the transmission system having the maximum transmission power detected by the selector 52 (step S756).
  • the arithmetic processing unit 213 receives the FW signal and the FB signal of the transmission system having the maximum transmission power of the first group. Then, the arithmetic processing unit 213 calculates a distortion compensation coefficient for the transmission system having the maximum transmission power of the first group (step S757).
  • the fluctuation amount monitoring unit 211 notifies the group selection unit 3 of an instruction to turn on the route to the transmission system allocated to the own system, that is, the transmission system belonging to the first group.
  • the group selection unit 3 turns on the path connecting the DPD1 system and the transmission system belonging to the first group (step S758).
  • the arithmetic processing unit 213 copies the calculated distortion compensation coefficient to the LUT 110 of the transmission system belonging to the first group via the group selection unit 3 (step S759).
  • the fluctuation amount monitoring unit 211 turns off the bias power mode (step S760).
  • the distortion compensation circuit according to the present embodiment performs the distortion compensation processing of the transmission system belonging to the other group using both DPD systems when there is no transmission system belonging to one group. It is the structure to implement. Thereby, load distribution can be performed and it can contribute to speeding-up of distortion compensation processing.
  • two DPD systems that perform distortion compensation of two groups are controlled using one CPU, but each group may be controlled by a plurality of CPUs. Furthermore, since the group with a large amount of transmission power has a large distortion, the processing amount of the DPD circuit increases. However, the group with a small amount of transmission power has a small distortion, so that the processing amount of the DPD circuit can be small. Therefore, when grouping by transmission power amount, the processing capability of the DPD system that performs processing on the side with the larger transmission power amount is increased, and the processing capability of the DPD system that performs processing on the side with the lower transmission power amount is decreased. Also good. As described above, the processing can be efficiently performed by providing a difference in the processing capability of each DPD system.
  • the transmission system is divided into two groups and distortion compensation is performed, but the number of groups is not limited.
  • the power threshold is fixed, but this power threshold may be determined from the current maximum transmission power and minimum transmission power and set again.
  • the distortion compensation coefficient used in the DPD processing tends to depend not only on the transmission power but also on the temperature.
  • grouping may be performed according to temperature.
  • grouping may be performed using other conditions (for example, power consumption of a transmission system circuit) as long as the distortion compensation coefficient depends on the conditions.
  • you may group by combining those conditions.
  • the operating rate of each DPD system can be increased by changing the power threshold value and regrouping or by performing grouping according to other conditions (for example, temperature).
  • the efficiency of the distortion compensation processing can be improved by changing the grouping condition according to the transmission system allocation amount to each DPD system.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

Des trajets d'entrée (11 à 15) reçoivent chacun un signal respectif parmi une pluralité de signaux d'entrée. Des multiplicateurs (101) utilisent chacun un coefficient de compensation de la distorsion pour effectuer une compensation de la distorsion du signal d'entrée obtenu sur le trajet correspondant parmi les trajets d'entrée (11 à 15). Des unités d'amplification (105) amplifient chacune le signal d'entrée qui a été obtenu du multiplicateur (101) correspondant, produisant et délivrant ainsi en sortie un signal de sortie. Des unités de calcul de coefficient de compensation (201, 202) : divisent les unités d'amplification (105) en une pluralité de groupes en fonction d'une condition prédéterminée ; sélectionnent comme signal représentatif de chaque groupe l'un des signaux de sortie délivrés par les unités d'amplification (105) ; produisent, pour chaque groupe correspondant au signal représentatif respectif, le coefficient de compensation de la distorsion en fonction des données d'une erreur existant entre le signal représentatif et le signal d'entrée qui lui correspond ; et délivrent en sortie le coefficient de compensation de la distorsion vers le multiplicateur (101) correspondant à l'unité d'amplification (105) incluse dans le groupe correspondant au signal représentatif.
PCT/JP2011/075634 2011-11-07 2011-11-07 Circuit de compensation de la distorsion et procédé de compensation de la distorsion WO2013069087A1 (fr)

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Publication number Priority date Publication date Assignee Title
US11008014B2 (en) * 2018-08-14 2021-05-18 Ford Global Technologies, Llc Methods and apparatus to determine vehicle weight information based on ride height
US11072323B2 (en) * 2018-02-26 2021-07-27 Audi Ag Method for operating an onboard network of a hybrid motor vehicle and hybrid motor vehicle

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JP2008295089A (ja) * 2004-09-21 2008-12-04 Hitachi Kokusai Electric Inc 歪補償増幅装置
JP2009272762A (ja) * 2008-05-01 2009-11-19 Hitachi Kokusai Electric Inc 歪み補償機能を備えた増幅装置
JP2010041470A (ja) * 2008-08-06 2010-02-18 Mitsubishi Electric Corp 送信機及び送受信装置
JP2011019029A (ja) * 2009-07-08 2011-01-27 Mitsubishi Electric Corp アレーアンテナ用送信機

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JP2008295089A (ja) * 2004-09-21 2008-12-04 Hitachi Kokusai Electric Inc 歪補償増幅装置
JP2009272762A (ja) * 2008-05-01 2009-11-19 Hitachi Kokusai Electric Inc 歪み補償機能を備えた増幅装置
JP2010041470A (ja) * 2008-08-06 2010-02-18 Mitsubishi Electric Corp 送信機及び送受信装置
JP2011019029A (ja) * 2009-07-08 2011-01-27 Mitsubishi Electric Corp アレーアンテナ用送信機

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US11072323B2 (en) * 2018-02-26 2021-07-27 Audi Ag Method for operating an onboard network of a hybrid motor vehicle and hybrid motor vehicle
US11008014B2 (en) * 2018-08-14 2021-05-18 Ford Global Technologies, Llc Methods and apparatus to determine vehicle weight information based on ride height

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