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WO2011070731A1 - Procédé de commande de puissance d'émission et dispositif de commande de puissance d'émission - Google Patents

Procédé de commande de puissance d'émission et dispositif de commande de puissance d'émission Download PDF

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Publication number
WO2011070731A1
WO2011070731A1 PCT/JP2010/006777 JP2010006777W WO2011070731A1 WO 2011070731 A1 WO2011070731 A1 WO 2011070731A1 JP 2010006777 W JP2010006777 W JP 2010006777W WO 2011070731 A1 WO2011070731 A1 WO 2011070731A1
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WIPO (PCT)
Prior art keywords
power
mode
error
value
output
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PCT/JP2010/006777
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English (en)
Japanese (ja)
Inventor
松岡昭彦
漆原伴哉
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Panasonic Corp
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Panasonic Corp
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Priority to US13/148,460 priority Critical patent/US8406713B2/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier

Definitions

  • the present invention relates to a transmission power control method and a transmission power control device used for a radio device.
  • a wireless device requires low power consumption and accurate transmission power control.
  • the communication time of a radio equipped with a battery such as a mobile phone can be extended.
  • communication quality can be improved by performing accurate transmission power control. If accurate transmission power control is not performed, noise leakage to other wireless devices may increase, so accurate transmission power control may be strictly required depending on wireless communication standards. Many.
  • FIG. 1 shows an example of a typical transmission apparatus using a polar modulation scheme.
  • the transmission apparatus includes a polar signal generation circuit 1, an amplitude control circuit 2, a phase modulation signal generation circuit 3, and a power amplifier (hereinafter referred to as PA) 4.
  • polar signal generation circuit 1 generates an amplitude component signal and a phase component signal of a transmission modulation signal from an input signal (that is, a transmission modulation signal).
  • the amplitude control circuit 2 controls the power supply voltage supplied to the PA 4 based on the amplitude component signal
  • the phase modulation signal generation circuit 3 generates a phase modulation signal input to the PA 4 based on the phase component signal.
  • This transmitter secures a dynamic range of transmission power by switching PA4 between compressed mode (compressed mode) and uncompressed mode (uncompressed mode).
  • compressed mode can be referred to as a saturated operation mode
  • non-compressed mode can be referred to as a non-saturated operation mode.
  • This transmitter operates PA4 in compressed mode when high transmission power is required.
  • the transmission apparatus operates PA4 in the uncompressed mode.
  • the transmission device controls the output power by changing the level of the power supply voltage to the PA 4 according to the desired output power.
  • This compressed mode is inherently very accurate in terms of output power because the PA is operating in the saturation region.
  • the transmission device controls the output power by changing the level of the phase modulation signal input to the PA 4 according to the desired output power.
  • the output power control is not accurate compared to the compressed mode.
  • FIG. Figure 2 shows that the output power in compressed mode is relatively accurate, but the output power in uncompressed mode is caused by fluctuations (such as fluctuation due to temperature, fluctuation due to aging, load fluctuation, etc.). The change is shown.
  • the output power in the non-compressed mode is likely to fluctuate due to various factors. Therefore, when switching between the compressed mode and the non-compressed mode, the output power may be discontinuous. As a result, there is a high possibility that a large fluctuation in transmission power occurs at the time of mode switching.
  • An object of the present invention is to provide a transmission power control method and a transmission power control apparatus capable of realizing highly accurate transmission power control when the mode of a power amplifier is switched between a compressed mode and an uncompressed mode. That is.
  • One aspect of the transmission power control method of the present invention is a process of controlling the output power of a power amplifier, and includes a process of switching the mode of the power amplifier between a compressed mode and an uncompressed mode.
  • a control method which calculates an output power error in a mode relative to a power setting value in a mode before switching as a comparison reference value error, sets an output power error between modes, sets a power setting value in a switching destination mode, and An output power error within the mode with respect to the power setting value of the switching destination mode is obtained, a gain linearity value is obtained based on the power setting value of the switching destination mode and the output power error within the mode, and the gain linearity is obtained. Based on the value of the comparison reference value error in the pre-switching mode and the output power error in the switching destination mode. To cancel, re-set the power settings of the switching destination mode.
  • One aspect of the transmission power control method of the present invention is a process of controlling the output power of a power amplifier, and includes a process of switching the mode of the power amplifier between a compressed mode and an uncompressed mode.
  • a third power setting value that is a setting value is set, and a third power measurement value that is an output power measurement value of the power amplifier when the third power setting value is set is set.
  • a step of determining an output power error between modes based on the second and third power measurement values, and a fourth power setting value for canceling the output power error between the modes Measuring a fourth power measurement value that is an output power measurement value of the power amplifier when the fourth power setting value is set; and the third and fourth power setting values and the third power setting value. And a step of obtaining an output power error in the mode with respect to the power setting value in the switching destination mode based on the fourth power measurement value, the third and fourth power setting values, and the output power error in the mode, A gain linearity value based on the target power, the output power error in the mode, the comparison reference value error, and the gain linearity value. Based on, it includes the steps of setting the fifth power setting value.
  • One aspect of the transmission power control device of the present invention is a transmission power control device that controls transmission power by switching a power amplifier between a compressed mode and an uncompressed mode, and the output of the power amplifier Based on a power setting unit for setting power, a power measuring unit for measuring output power of the power amplifier, a power setting value set by the power setting unit, and an output power measurement value measured by the power measuring unit An error calculation unit that calculates an error of an output power measurement value with respect to the power setting value; and a gain linearity calculation unit that calculates a gain linearity value, wherein the power setting unit is a power setting value in a pre-switching mode.
  • the fixed unit includes a first power measurement value that is an output power measurement value of the power amplifier when the first power setting value is set, and the power amplifier when the second power setting value is set.
  • a fourth power measurement value that is an output power measurement value of the power amplifier when set is measured, and the error calculation unit is configured to measure the third and fourth power setting values and the third and fourth powers.
  • the gain linearity calculation unit includes the third and fourth power setting values and the output power error in the mode.
  • the gain setting value is calculated based on the target power, the output power error in the mode, the comparison reference value error, and the gain linearity value. Set.
  • the output power error between the modes with respect to the power setting value and the output power within the mode with respect to the power setting value Even when errors occur in a composite manner, the output power can be matched to the target power with high accuracy.
  • the block diagram which shows the structure of the polar modulation transmitter which concerns on embodiment of this invention The figure which shows the mode of the scaling coefficient set which is provided in the transmission power control section Diagram showing power control tolerance for each output power step size command in 3GPP UMTS standard Diagram summarizing allowable step sizes
  • Flow chart showing transmission power control procedure when error due to fluctuation of gain linearity does not occur Diagram showing how transmission power changes when an error due to fluctuations in gain linearity occurs The figure which shows the mode of a change of transmission power at the time of performing transmission power control of embodiment
  • the flowchart which shows the transmission power control procedure of embodiment Block diagram showing a configuration example of a transmission power control unit Block diagram showing a configuration
  • FIG. 3 shows the configuration of the transmission apparatus according to the embodiment of the present invention.
  • the present invention is not limited to a transmission device using a polar modulation method, and the transmission power is controlled by switching the power amplifier between a compressed mode and an uncompressed mode according to the magnitude of the transmission power.
  • the present invention can be widely applied to transmitters that perform such operations.
  • the transmission apparatus 100 includes a polar signal generation circuit 101, a phase modulation signal generation circuit 102, a power amplifier (PA) 103, an amplitude control circuit 104, a variable gain amplifier (VGA), and a variable amplification configured by an attenuator.
  • a circuit 105 and a power alignment loop (PAL) 111 are included.
  • the PAL 111 includes a detection circuit 106 that detects the output power of the PA 103, a low-pass filter (LPF) 108, an analog-digital converter (ADC) 109, and a transmission power control unit 107.
  • the detection circuit 106, the low-pass filter (LPF) 108, and the analog-digital converter (ADC) 109 constitute a power measurement unit that measures the output power of the PA 103.
  • the polar modulation signal (input complex signal) obtained by the spread modulation unit 110 is input to the polar signal generation circuit 101.
  • the polar signal generation circuit 101 generates an amplitude component signal and a phase component signal from a spread modulation signal that is an input complex signal.
  • the polar signal generation circuit 101 operates according to the input complex signal from the spread modulation unit 110, and includes an envelope component signal (amplitude component signal) including amplitude information of the input complex signal, and the input complex signal.
  • a constant envelope component signal (phase component signal) including phase information is generated.
  • the amplitude component signal is input to the amplitude control circuit 104, and the constant amplitude phase component signal is input to the phase modulation signal generation circuit 102.
  • the phase modulation signal generation circuit 102 performs phase modulation using the phase component signal to generate an RF phase modulation signal.
  • the variable amplification circuit 105 amplifies or attenuates the RF phase modulation signal based on the phase path scaling coefficient (Phase-path magnetitude scaling) S10 from the transmission power control unit 107, and the RF phase modulation signal scaled thereby is PA103. To the RF signal input terminal.
  • the amplitude control circuit 104 multiplies the amplitude component signal by an amplitude path scaling coefficient (AM-path envelope scaling) S11 from the transmission power control unit 107, thereby forming a power supply voltage of the PA 103, which is used as a power input terminal of the PA 103. To supply.
  • AM-path envelope scaling AM-path envelope scaling
  • the detection circuit 106 is composed of, for example, a PIN diode or other semiconductor detector, and detects the output power of the PA 103.
  • the LPF 108 is configured by, for example, an RC circuit, and smoothes the output power of the PA 103 by integrating the detection result of the output power of the PA 103.
  • the LPF 108 is provided to suppress fluctuations in the detected value of the output power of the PA 103 obtained by the detection circuit 106.
  • the ADC 109 samples the output result of the LPF 108.
  • the cutoff frequency of the LPF 108 is set too high, the fluctuation cannot be sufficiently suppressed. Conversely, if the cutoff frequency is set too low, it takes time until the output of the LPF 108 is stabilized after the power adjustment. Therefore, it is preferable to set the cutoff frequency of the LPF 108 in consideration of these points.
  • the 3GPP standard requires that power control be accommodated within ⁇ 25 ⁇ sec from the symbol boundary.
  • the time constant of the LPF 108 needs to be about several ⁇ sec or less.
  • the time constant of the LPF 108 only needs to be set to such an extent that the instantaneous envelope fluctuation of the spread modulation signal can be canceled, and the basic period of the spread modulation signal (spread code) based on the spread code pattern used in the spread modulation unit 110. Fluctuations slower than the chip speed) may remain.
  • the cutoff frequency is preferably in the range of several tens of kHz to several hundreds of kHz. In the present embodiment, as an example, the cutoff frequency is 300 kHz.
  • the transmission power control unit 107 includes a power setting unit 107-1 and an error calculation unit 107-2.
  • the power setting unit 107-1 sets the output power of the PA 103. Based on the power setting value set by the power setting unit 107-1 and the output power measurement value measured by the power measurement unit (detection circuit 106, LPF 108 and ADC 109), the error calculation unit 107-2 The error of the output power measurement value with respect to is calculated.
  • the transmission power control unit 107 inputs the power measurement value of the PA 103 via the detection circuit 106, the LPF 108, and the ADC 109. Also, the transmission power control unit 107 confirms whether or not a transmission power control signal is notified from a communication partner (for example, a base station device) (not shown), and when notified, transmits the next symbol at the symbol boundary. A control power value ⁇ P is set.
  • the transmission power control signal does not need to be notified from the communication partner, and may be a transmission power control signal generated inside a terminal equipped with a polar modulation transmission apparatus.
  • the power setting unit 107-1 of the transmission power control unit 107 obtains scaling coefficients S10 and S11 based on the output power measurement value of the PA 103 and the transmission control power value ⁇ P, and these are obtained as the amplitude control circuit 104 and the variable amplification circuit. By sending them to 105, the power supply voltage of the PA 103 and the level of the input signal (RF phase modulation signal) of the PA 103 are controlled.
  • the transmission power control unit 107 obtains the original value of the scaling coefficient obtained by referring to the table using the transmission power setting value as an address, and the output power measurement value obtained by the detection circuit 106, the LPF 108, and the ADC 109.
  • the final scaling coefficients S10 and S11 are calculated using the corrected scaling coefficients.
  • the transmission power control unit 107 has a table (hereinafter referred to as a power table) in which transmission power setting values are associated with scaling factors.
  • FIG. 4 shows the state of the scaling coefficient set of the power table provided in the transmission power control unit 107.
  • the output power of the polar modulation transmitter 100 is controlled by the amplitude-modulated power supply voltage applied to the collector (or drain) node of the PA 103, while the power of the constant-modulation phase-modulated RF signal is constant. To be kept.
  • the output power of the PA 103 is controlled by changing the scaling factor multiplied by the driving signal in the phase path while maintaining the scaling factor multiplied by the envelope of the amplitude path constant.
  • the scaling factor that is not used for power control in the compressed mode, it is the phase path scaling factor multiplied by the phase-modulated RF signal, and in the non-compressed mode) (The amplitude path scaling factor multiplied by the envelope of the amplitude path) does not necessarily have to be kept constant, and is adjusted to improve the distortion characteristics and noise characteristics of the PA 103 output or to correct the output power. You may decide to do it.
  • the transmission power control unit 107 has a scaling coefficient set for the compressed mode and a scaling coefficient set for the non-compressed mode.
  • an overlap region in which scaling coefficient sets for both modes are prepared is provided near the boundary between the compressed mode and the uncompressed mode.
  • the overlap region is a range in which the required output power can be generated regardless of whether the compressed mode or the uncompressed mode is selected. More specifically, a compressed mode and an uncompressed mode can be realized by having an amplitude path scaling coefficient and a phase path scaling coefficient as indicated by a solid line in FIG. In the case of the present embodiment, in addition to the scaling coefficient set indicated by the solid line, the scaling coefficient set indicated by the dotted line is provided. As a result, the compressed mode area and the uncompressed mode area are expanded, and an overlap area is provided in which the PA 103 can be operated in either the compressed mode or the uncompressed mode. ing.
  • the transmission device 100 includes a gain linearity calculation unit 120.
  • the gain linearity calculation unit 120 receives the power adjustment amount S20 and the power change amount S21 from the transmission power control unit 107.
  • the power adjustment amount is a target power adjustment amount set by the transmission power control unit 107 in order to increase or decrease the output power of the PA 103, and is a difference between power setting values, that is, an adjustment amount of the power setting value.
  • the power change amount is a change amount of the actual output power of the PA 103, which is a difference between power measurement values, that is, a change amount of the power measurement value, and is calculated based on the output value of the ADC 109.
  • the gain linearity is a value obtained by dividing the power change amount by the power adjustment amount (that is, the power change amount / power adjustment amount), and indicates the actual power change amount when the power is increased or decreased by 1 dB.
  • Gain linearity varies depending on temperature, mode and device characteristics. The actual transmission power cannot be accurately controlled unless the transmission power control is performed in consideration of the gain linearity. Therefore, in this embodiment, the gain linearity calculation unit 120 calculates the gain linearity. Then, the transmission power control unit 107 performs transmission power control (that is, setting of a scaling coefficient) in consideration of the gain linearity S22 obtained by the gain linearity calculation unit 120.
  • the transmission device 100 can control the output power (that is, transmission power) of the PA 103 to be the target value even when the gain linearity changes due to a change in temperature or the like.
  • the transmission device 100 is required to finish power control within a time determined by the 3GPP standard, for example.
  • the 3GPP standard requires that the power control be accommodated within ⁇ 25 ⁇ sec from the symbol boundary.
  • 3GPP (3 rd Generation Partnership Project) 25.101 error tolerance of the transmission power that is required will be described.
  • 3GPP which is the standard body for spreading the UMTS and W-CDMA standards, allows the mobile terminal to perform discrete steps (eg, +/- 1 dB, +/- 2dB, +/- 3 dB, .........) requesting to increase or decrease the output power.
  • the UMTS standard also specifies that these power increase / decrease steps are performed within a certain tolerance.
  • the resulting output power is within +/- 0.5 dB of the target output power. It is required to fit. Therefore, for example, if the transmission device of the mobile terminal is operating at 0 dBm and a TPC command of “1” is received, the transmission device of the mobile terminal has a transmission power within the range of + 0.5 dBm and 1.5 dBm. It must be adjusted to fit. For larger step sizes of 2 dB and 3 dB step sizes, wider tolerances such as +/- 1 dB and +/- 1.5 dB are allowed.
  • the 3GPP UMTS standard also defines a cumulative allowable range for the power command group. For example, for 10 power control commands each having a step size of 1 dB, the output power level is required to be within +/- 2 dB of the target output power level.
  • item [2-3] describes transmission power control according to the present embodiment, taking into account comparison reference value errors, inter-mode and intra-mode errors.
  • a case where the transmission power is controlled from the 8 dBm state in the compressed mode to the 4 dBm state in the non-compressed mode will be described as an example. That is, a case will be described in which the transmission power is reduced by 4 dB and mode switching exists in the reduction process. Further, in the following example, a case will be described in which a transmission power error (mode error) between modes at the time of mode switching from the compressed mode to the non-compressed mode is ⁇ 2 dB.
  • mode error transmission power error
  • FIG. 8 shows how the transmission power changes.
  • FIG. 9 shows a transmission power control procedure performed in the transmission apparatus 100.
  • FIG. 8 shows a section in which each processing step ST1-10 is executed. Yes.
  • step ST1 the power setting unit 107-1 of the transmission power control unit 107 performs power in the pre-switching mode (compressed mode).
  • the power of the PA 103 is set to a comparison power (that is, the power set value is set to a comparison coefficient).
  • scaling factors S10 and S11 for changing the transmission power from 8 dBm to 7 dBm in the compressed mode by -1 dB are set, and the transmission power is changed by -1 dB.
  • step ST2 the output power of the PA 103 is measured by the power measurement unit (the detection circuit 106, the LPF 108, and the ADC 109).
  • the power measurement unit the detection circuit 106, the LPF 108, and the ADC 109.
  • the power setting value in the power setting unit 107-1 is 7 dBm
  • the output power of the PA 103 is 7 dBm
  • the above-mentioned comparison reference value refers to the measured value in step ST2.
  • the comparison reference value error means an error (deviation) in actual output power (that is, a measured value) with respect to a difference in set power when the set power is changed and the process proceeds from step ST1 to step ST2.
  • the measured value when the set power is changed by 1 dB, the measured value also fluctuates by 1 dB, so the comparison reference value error is zero.
  • step ST3 the power setting unit 107-1 sets the power of the PA 103 to the power for comparison in another mode in order to correct an error between the power setting value between the modes and the actual output power (that is, the power setting unit 107-1). , Set the power setting value to the coefficient for comparison). Specifically, the transmission power control unit 107 sets scaling coefficients S10 and S11 prepared for outputting 7 dBm in another mode (in the example of FIG. 8, uncompressed mode).
  • step ST4 the output power of the PA 103 is measured by the power measuring unit, and in step ST5, the error of the output power of the PA 103 between the modes is calculated by the error calculating unit 107-2.
  • step ST3 the power setting values (scaling coefficients S10 and S11) for outputting 7 dBm power in the uncompressed mode are set in step ST3, the measured actual output power is An example of 5 dBm is shown. That is, the error calculation unit 107-2 calculates that the error between modes is ⁇ 2 dB.
  • step ST6 the power setting unit 107-1 sets the power setting value of the uncompressed mode so that the error between the modes is canceled. That is, the power setting unit 107-1 sets the non-compressed mode scaling factors S10 and S11 that increase the transmission power by 2 dB compared to the non-compressed mode scaling factors S10 and S11 set in step ST3. Set.
  • step ST7 the output power of the PA 103 is measured by the power measuring unit, and is measured as 7 dBm in the example of FIG.
  • step ST8 a residual error (difference between the power measurement value in step ST2 and the power measurement value in step ST7) is calculated by the error calculation unit 107-2.
  • step ST9 the residual error is calculated by the power setting unit 107-1.
  • the power adjustment amount taking into account is calculated.
  • the power adjustment amount is a value obtained by subtracting the residual error from the remaining power up to the target.
  • the remaining power up to the target (4 dBm) is ⁇ 3 dB, and the residual error is zero. Therefore, the power adjustment amount calculated in step ST9 is ⁇ 3 dB.
  • This residual error is caused by a variation in gain linearity (which may be referred to as a gain linearity error). Since FIG. 8 is an example in which the variation in gain linearity is zero, the residual error is also zero.
  • step ST10 the power setting unit 107-1 sets scaling coefficients S10 and S11 corresponding to the power adjustment amount calculated in step ST9, and sends them to the variable amplification circuit 105 and the amplitude control circuit 104, respectively.
  • the target power of 4 dBm is output from the PA 103.
  • FIG. 10 shows comparison reference value error and in-mode error (gain linearity fluctuation). The case where the transmission power has an error due to the error due to the error (that is, the transmission power deviates from the target) will be described.
  • FIG. 10 shows how the transmission power changes when the transmission power control procedure shown in FIG. 9 is executed.
  • FIG. 10 shows a section in which each processing step ST1-10 is executed.
  • step ST1 the power setting unit 107-1 determines the power setting value in the pre-switching mode (compressed mode) and the actual PA 103.
  • the power of the PA 103 is set to the power for comparison (that is, the power set value is set to the coefficient for comparison).
  • scaling factors S10 and S11 for changing the transmission power by ⁇ 1 dB from 8 dBm to 7 dBm in the compressed mode are set, and the state in which the transmission power is changed by ⁇ 0.8 dB is shown.
  • step ST2 the output power of the PA 103 is measured by the power measuring unit.
  • the power setting value in the power setting unit 107-1 is 7 dBm
  • the output power of the PA 103 is 7.2 dBm
  • an output power (transmission power) error with respect to the power setting value occurs.
  • the state is shown. That is, the comparison reference value is shifted by +0.2 dB in the plus direction.
  • the deviation of the comparison reference value is calculated as a comparison reference value error by the error calculation unit 107-2.
  • step ST3 the power setting unit 107-1 sets the power of the PA 103 to the power for comparison in another mode in order to correct an error between the power setting value between the modes and the actual output power (that is, the power setting unit 107-1). , Set the power setting value to the coefficient for comparison). Specifically, the power setting unit 107-1 sets scaling coefficients S10 and S11 prepared for outputting 7 dBm in another mode (in the example of FIG. 10, uncompressed mode).
  • step ST4 the output power of the PA 103 is measured by the power measuring unit, and in step ST5, the error of the output power of the PA 103 between the modes is calculated by the error calculating unit 107-2.
  • the measured actual output power is set in spite of the setting of the power setting values (scaling coefficients S10, S11) for outputting 7 dBm power in the uncompressed mode in step ST3.
  • step ST6 the power setting unit 107-1 sets the power setting value of the uncompressed mode so that the error between the modes is canceled. That is, the non-compressed mode scaling factors S10 and S11 that increase the transmission power by 2 dB are set as compared with the non-compressed mode scaling factors S10 and S11 set in step ST3.
  • the scaling factors S10 and S11 that increase the output power by 2 dB are set, the output power of the PA 103 increases only by 1.6 dB due to the fluctuation of the gain linearity.
  • step ST7 the output power of the PA 103 is measured by the power measuring unit.
  • step ST8 the residual error is calculated by the error calculating unit 107-2.
  • step ST9 the power setting unit 107-1 is added with the residual error.
  • An adjustment amount is calculated.
  • ⁇ 0.4 dB is calculated as the residual error
  • step ST10 the power setting unit 107-1 sets scaling coefficients S10 and S11 corresponding to the power adjustment amount ⁇ 2.6 dB calculated in step ST9, and sends them to the variable amplifier circuit 105 and the amplitude control circuit 104, respectively. To do.
  • the output power of the PA 103 is 4 dBm which is the target.
  • the output power of the PA 103 which should change by -2.6 dB, changes only by -2.08 dB due to fluctuations in gain linearity.
  • the comparison reference value is shifted by +0.2 dBm in the positive direction. Therefore, the output power of the PA 103 is 4.72 dBm.
  • the final output power of the PA 103 has an error of +0.72 dB with respect to the target value, and accurate transmission power control cannot be performed.
  • FIG. 11 and FIG. 12 are used to illustrate comparison reference value error and gain linearity variation. A description will now be given of transmission power control in consideration of the above.
  • FIG. 11 shows how the transmission power changes.
  • FIG. 12 shows a transmission power control procedure of the present embodiment.
  • the step which performs the process similar to FIG.8 and FIG.9 is attached
  • step ST31 the power setting unit 107-1 sets the power setting value in the pre-switching mode (compressed mode) as a comparison value. These two powers are set, and the difference between these two set powers is calculated. In the example of FIG. 11, the two set powers are 8 dBm and 7 dBm, and the difference between the two set powers is 1 dB.
  • step ST2 the output power of the PA 103 is measured by the power measuring unit, and in step ST32, the comparison reference value error (dREF) is calculated by the error calculating unit 107-2.
  • the comparison reference value error (dREF) is calculated by the error calculating unit 107-2.
  • the comparison reference value is shifted by +0.2 dB in the plus direction. This difference in comparison reference value is calculated as a comparison reference value error in step ST32.
  • step ST3 the power setting unit 107-1 sets the power of the PA 103 to the power for comparison in another mode in order to correct an error between the power setting value between the modes and the actual output power (that is, the power setting unit 107-1). , Set the power setting value to the coefficient for comparison). Specifically, the power setting unit 107-1 sets scaling coefficients S10 and S11 prepared for outputting 7 dBm in another mode (in the example of FIG. 11, uncompressed mode).
  • step ST4 the output power of the PA 103 is measured by the power measuring unit, and in step ST5, the error of the output power of the PA 103 between the modes is calculated by the error calculating unit 107-2.
  • step ST33 the transmission device 100 sets the power setting value of the uncompressed mode such that the power setting unit 107-1 cancels the output power error between the modes.
  • the power setting value difference dADJ1 at this time is calculated.
  • the power setting value difference dADJ1 is 2 dB.
  • step ST34 the output power of the PA 103 is measured by the power measuring unit, and in step ST35, the residual error E2 is calculated by the error calculating unit 107-2.
  • the residual error E2 ⁇ 0.4 dB.
  • step ST36 the gain linearity calculation unit 120 calculates the gain linearity Gact based on the power setting value difference dADJ1 and the residual error E2. Specifically, the gain linearity calculation unit 120 calculates the gain linearity Gact using the following equation.
  • Gact (dADJ1 + E2) / dADJ1 (1)
  • step ST37 the power setting unit 107-1 calculates a power adjustment amount in consideration of the gain linearity Gact and the comparison reference value error in addition to the residual error. That is, in step ST9 (FIG. 9) of item [2-2], the power adjustment amount is calculated taking into account the residual error. However, in the present embodiment, the residual error is not simply added to the residual error. A power adjustment amount that takes into account the gain linearity Gact and the comparison reference value error is calculated. Specifically, the power setting unit 107-1 calculates the power adjustment amount by the following equation.
  • Power adjustment amount (Remaining power up to target power-E2-dREF) / Gact ......... (2)
  • the “remaining power up to the target power” in the expression (2) is not the actual remaining power but the remaining power up to the target in the dimension of the power setting value.
  • the calculation of the numerator in Expression (2) excludes the current residual error E2 from the remaining power up to the target in the dimension of the power setting value, and further reflects the comparison reference value error dREF (that is, The actual remaining power is calculated by calculating the numerator of equation (2)).
  • the transmission power is controlled by setting scaling coefficients S10 and S11 corresponding to the amount.
  • the output power of the PA 103 can finally be accurately adjusted to the target power (4 dBm).
  • the transmission power control according to the present embodiment it is possible to realize accurate transmission power control without causing an error due to a change in gain linearity and a comparison reference value error.
  • FIG. 13 shows a configuration example 1 of the transmission power control unit 107.
  • the transmission power control unit 107 in FIG. 13 includes a control unit 131, a lookup table (LUT) 132 that stores scaling coefficients, a lookup table (LUT) 133 that stores correction values, and multipliers 134 and 135. And have.
  • the function of the power setting unit 107-1 in FIG. 3 is realized by the control unit 131, the lookup tables 132 and 133, and the multipliers 134 and 135.
  • the control unit 131 inputs the output of the ADC 109 and the transmission power control signal.
  • the control unit 131 generates a read address of the LUT 132 based on the output of the ADC 109 and the transmission power control signal, and outputs this to the multiplier 134.
  • the scaling coefficient corresponding to the read address input from the control unit 131 via the multiplier 134 is read from the LUT 132, and this scaling coefficient is sent to the control unit 131.
  • control unit 131 outputs the power adjustment amount S20 and the power change amount S21 to the gain linearity calculation unit 120.
  • the gain linearity calculation unit 120 calculates the gain linearity S22 based on the power adjustment amount and the power change amount, and sends this to the control unit 131. That is, the process of step ST36 in FIG. 12 is performed.
  • the control unit 131 calculates the power adjustment amount based on the gain linearity S22 input from the gain linearity calculation unit 120 and the power measurement value input from the ADC 109. That is, the process of step ST37 in FIG. 12 is performed. Specifically, the control unit 131 outputs the calculated gain linearity error to the LUT 133. A correction value (correction coefficient) corresponding to the gain linearity error is output from the LUT 133 to the multipliers 134 and 135. As a result, the scaling coefficient output from the LUT 133 and the scaling coefficient output from the control unit 131 are corrected, so that the output power of the PA 103 is adjusted. This process corresponds to the process of step ST26 in FIG. In the configuration example of FIG.
  • the multipliers 134 and 135 are provided, and both the scaling coefficient output from the LUT 133 and the scaling coefficient output from the control unit 131 are corrected. May be provided, and only one of the scaling coefficient output from the LUT 133 or the scaling coefficient output from the control unit 131 may be corrected.
  • FIG. 14 shows a configuration example 2 of the transmission power control unit 107.
  • the transmission power control unit 107 in FIG. 14 includes a control unit 141, a lookup table (LUT) 142 in which scaling coefficients are stored, and a power adjustment amount compensation unit 143.
  • the function of the power setting unit 107-1 in FIG. 3 is realized by the control unit 141, the lookup table 142, and the power adjustment amount compensation unit 143.
  • the function of the error calculation unit 107-2 in FIG. 3 is realized by the control unit 141 and the power adjustment amount compensation unit 143.
  • the control unit 141 inputs the output of the ADC 109 and the transmission power control signal.
  • the control unit 141 generates a read address of the LUT 142 based on the output of the ADC 109 and the transmission power control signal, and outputs this to the LUT 142.
  • a scaling coefficient corresponding to the read address is read from the LUT 142, and this scaling coefficient is sent to the control unit 141.
  • the power adjustment amount S20 and the power change amount S21 are output from the control unit 141 to the gain linearity calculation unit 120.
  • the gain linearity calculation unit 120 calculates the gain linearity S22 based on the power adjustment amount S20 and the power change amount S21. That is, the process of step ST24 in FIG. 12 is performed.
  • the power adjustment amount compensation unit 143 receives the gain linearity S22 from the gain linearity calculation unit 120 and the power adjustment amount S20 from the control unit 141, corrects the power adjustment amount S20 based on these, and corrects the corrected power adjustment amount S23. Is output to the control unit 141. This process corresponds to the process in step ST25 of FIG.
  • the control unit 141 generates a read address of the LUT 142 based on the corrected power adjustment amount S23 and reads the scaling coefficient from the LUT 142. This process corresponds to the process of step ST26 in FIG.
  • FIG. 15 illustrates a configuration example 3 of the transmission power control unit 107.
  • the transmission power control unit 107 in FIG. 15 includes a control unit 151, a lookup table (LUT) 152 that stores scaling coefficients, a threshold determination unit 153, an LUT 154 that stores compensation coefficients, and a power adjustment amount compensation unit. 155.
  • LUT lookup table
  • the control unit 151 inputs the output of the ADC 109 and the transmission power control signal.
  • the control unit 151 generates a read address of the LUT 152 based on the output of the ADC 109 and the transmission power control signal, and outputs this to the LUT 152.
  • a scaling coefficient corresponding to the read address is read from the LUT 152, and this scaling coefficient is sent to the control unit 151.
  • the power adjustment amount S20 and the power change amount S21 are output from the control unit 151 to the threshold value determination unit 153.
  • the threshold determination unit 153 calculates an error of the power change amount S21 with respect to the power adjustment amount S20, and determines this error as a threshold.
  • the threshold determination unit 153 compares the absolute value of the error with a predetermined threshold and outputs the comparison result.
  • the threshold determination unit 153 uses one threshold and outputs error information indicating whether the error is equal to or greater than the threshold and whether the error is positive or negative. For example, when the absolute value of the error is equal to or greater than the threshold and the error is positive, “1” is used as error information. When the absolute value of the error is equal to or greater than the threshold and the error is negative, “ ⁇ 1” is used as the error information. If the absolute value of the error is less than the threshold, “0” is output as error information.
  • the LUT 154 stores a compensation coefficient corresponding to each error information, and the compensation coefficient corresponding to the error information is output to the power adjustment amount compensation unit 155. Specifically, when error information indicating that the absolute value of the error is equal to or greater than the threshold and the error is positive is output, the first compensation coefficient is output, and the absolute value of the error is equal to or greater than the threshold and the error is When error information indicating negative is input, the second compensation coefficient is output, and when error information indicating that the absolute value of the error is less than the threshold is input, 1 (that is, the error is small). Output no compensation).
  • the power adjustment amount compensation unit 155 receives the power adjustment amount S20 and the compensation coefficient, calculates the corrected power adjustment amount S23 by multiplying the power adjustment amount S20 by the compensation coefficient, and outputs this to the control unit 151.
  • the control unit 151 generates a read address of the LUT 152 based on the corrected power adjustment amount S23 and reads the scaling coefficient from the LUT 152. This process corresponds to the process of step ST26 in FIG.
  • one threshold is used, but the present invention is not limited to this.
  • a plurality of thresholds may be used, and a plurality of compensation coefficients may be provided corresponding to the thresholds.
  • the power adjustment amount compensation unit 155 corrects the power adjustment amount S21 to be larger as the error of the power change amount S21 with respect to the power adjustment amount S20 is larger. Further, by having a fine threshold value, it becomes possible to use a more accurate compensation coefficient, and the power adjustment amount S21 can be compensated with high accuracy.
  • the configuration of FIG. 15 is a configuration in which an error due to gain linearity is simply compensated by the threshold determination unit 153, the LUT 154, and the power compensation unit 155.
  • the configuration of FIG. 15 can substantially compensate for an error due to gain linearity without having the gain linearity calculation unit 120, and thus the configuration can be simplified as compared with the configurations of FIGS.
  • the transmission power control method of the present embodiment sets the power setting value of the switching destination mode that cancels the output power error between the modes (corresponding to step ST21), and the switching destination.
  • An output power error in the mode with respect to the mode power setting value is obtained (corresponding to step ST23), and a gain linearity value is obtained based on the power setting value in the switching destination mode and the output power error in the mode ( Based on the gain linearity value, the power setting value of the switching destination mode is reset (corresponding to steps ST25 and ST26).
  • the transmission power control method of the present embodiment can be paraphrased as follows.
  • the transmission power control method of the present embodiment sets the first and second power setting values that are the power setting values in the pre-switching mode (corresponding to step ST31), and the first and second power settings.
  • First and second power measurement values which are output power measurement values of the power amplifier when the values are set, are measured (corresponding to step ST2), and the second power with respect to the second power setting value is measured.
  • a step of obtaining a measurement value deviation as a comparison reference value error (corresponding to step ST32)
  • a third power setting value which is a power setting value of the switching destination mode is set, and the third power setting value is set.
  • a step of obtaining an output power error between nodes (corresponding to step ST5), a fourth power setting value for canceling the output power error between the modes is set, and the fourth power setting value is set Measuring a fourth power measurement value that is an output power measurement value of the power amplifier (corresponding to steps ST33 and 34), the third and fourth power setting values, and the third and fourth powers
  • a step of obtaining an output power error in the mode with respect to the power setting value in the switching destination mode based on the measured value (corresponding to step ST35), the third and fourth power setting values, and the output power error in the mode
  • a step of obtaining a value of gain linearity (corresponding to step ST36), a target power, an output power error in the mode, and a previous The comparison reference value error based on the value of the gain linearity, comprising a step (corresponding to step ST37,
  • the transmission power control method and apparatus of the present embodiment after setting a power setting value that cancels the output power error between modes, the power that cancels the output power error caused by the fluctuation of the gain linearity in the switching destination mode By resetting the set value, even if the output power error between modes with respect to the power set value and the output power error within the mode with respect to the power set value occur in combination, the output power is accurately set to the target power. Can be matched.
  • the output power error in the mode with respect to the power setting value in the pre-switching mode is restored to the power setting value in the switching destination mode that also cancels the comparison reference value error. Since it is set, the output power can be adjusted to the target power with higher accuracy.
  • the present invention is applied to the transmission apparatus 100 that performs polar modulation.
  • the scope of application of the present invention is not limited thereto. That is, in the above-described embodiment, the case where the amplitude component signal whose amplitude is controlled is input to the power input terminal of the PA 103 and the phase modulation signal is input to the signal input terminal of the PA 103 is described, but the present invention is not limited thereto.
  • the present invention may be applied to a case where a DC voltage (constant voltage) is supplied to the power input terminal of the PA 103 and a linearly modulated signal is input to the signal input terminal of the PA 103, such as quadrature modulation. The same effect can be obtained.
  • the transmission power control method and apparatus accurately adjust the output power of the power amplifier to the target power when the control process of switching the mode of the power amplifier between the compressed mode and the uncompressed mode is included. Therefore, it is suitable for use in a portable radio device or the like.
  • SYMBOLS 100 Transmitter 101 Polar signal generation circuit 102 Phase modulation signal generation circuit 103 Power amplifier (PA) DESCRIPTION OF SYMBOLS 104 Amplitude control circuit 105 Variable amplifier circuit 106 Detection circuit 107 Transmission power control part 107-1 Power setting part 107-2 Error calculation part 108 Low pass filter (LPF) 109 Analog-to-digital converter (ADC) 110 Spread Modulation Unit 111 Power Alignment Loop (PAL) 120 Gain linearity calculation unit S10, S11 Scaling coefficient S20 Power adjustment amount S21 Power change amount S22 Gain linearity S23 Correction power adjustment amount

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transmitters (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Amplifiers (AREA)

Abstract

L'invention porte sur un procédé permettant de réaliser une commande de puissance d'émission très précise d'un amplificateur de puissance lors d'une commutation de l'amplificateur de puissance entre le mode compressé et le mode non compressé. Le procédé consiste à : lors d'une commutation d'un premier mode à un second mode, déterminer, à titre d'écart de valeur de référence de comparaison, l'écart de puissance de sortie dans le premier mode par rapport à la valeur de consigne de puissance pour le premier mode (étape ST32) ; régler la valeur de consigne de puissance pour le second mode de façon à annuler l'écart de puissance de sortie entre les deux modes (étape ST33) ; déterminer l'écart de puissance de sortie dans le second mode par rapport à la valeur de consigne de puissance pour le second mode (étape ST35) ; déterminer la valeur de linéarité de gain sur la base de la valeur de consigne de puissance pour le second mode et de l'écart de puissance de sortie dans le second mode (étape ST36) ; et, sur la base de la valeur de linéarité de gain, régler à nouveau la valeur de consigne de puissance pour le second mode de façon à annuler l'écart de valeur de référence de comparaison dans le premier mode et l'écart de puissance de sortie dans le second mode (étapes ST37, 38).
PCT/JP2010/006777 2009-12-11 2010-11-18 Procédé de commande de puissance d'émission et dispositif de commande de puissance d'émission Ceased WO2011070731A1 (fr)

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JP2009281710A JP2011124858A (ja) 2009-12-11 2009-12-11 送信パワー制御方法及び送信パワー制御装置

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US11543448B2 (en) * 2013-12-23 2023-01-03 Keysight Technologies, Inc. Dynamically determining measurement uncertainty (MU) of measurement devices

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008050833A1 (fr) * 2006-10-25 2008-05-02 Panasonic Corporation Procédé d'émission et dispositif d'émission
WO2008084852A1 (fr) * 2007-01-12 2008-07-17 Panasonic Corporation Procédé de commande de puissance de transmission et dispositif de transmission
WO2008084851A1 (fr) * 2007-01-12 2008-07-17 Panasonic Corporation Dispositif de transmission et procédé de commande de puissance de transmission
WO2008084850A1 (fr) * 2007-01-12 2008-07-17 Panasonic Corporation Dispositif de transmission de modulation polaire et procédé de commande de puissance de transmission

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6670849B1 (en) * 2000-08-30 2003-12-30 Skyworks Solutions, Inc. System for closed loop power control using a linear or a non-linear power amplifier
US7570709B2 (en) 2001-03-08 2009-08-04 Siemens Aktiengesellschaft Automatic transmit power control loop with modulation averaging
US6983025B2 (en) * 2001-04-11 2006-01-03 Tropian, Inc. High quality power ramping in a communications transmitter
US7072626B2 (en) * 2003-04-30 2006-07-04 Telefonaktiebolaget Lm Ericsson (Publ) Polar modulation transmitter
US8064855B2 (en) 2006-10-25 2011-11-22 Panasonic Corporation Transmission power controller

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008050833A1 (fr) * 2006-10-25 2008-05-02 Panasonic Corporation Procédé d'émission et dispositif d'émission
WO2008084852A1 (fr) * 2007-01-12 2008-07-17 Panasonic Corporation Procédé de commande de puissance de transmission et dispositif de transmission
WO2008084851A1 (fr) * 2007-01-12 2008-07-17 Panasonic Corporation Dispositif de transmission et procédé de commande de puissance de transmission
WO2008084850A1 (fr) * 2007-01-12 2008-07-17 Panasonic Corporation Dispositif de transmission de modulation polaire et procédé de commande de puissance de transmission

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