WO2004086713A1 - 直交変調装置、方法、プログラム、記録媒体および変調装置 - Google Patents
直交変調装置、方法、プログラム、記録媒体および変調装置 Download PDFInfo
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- WO2004086713A1 WO2004086713A1 PCT/JP2004/003816 JP2004003816W WO2004086713A1 WO 2004086713 A1 WO2004086713 A1 WO 2004086713A1 JP 2004003816 W JP2004003816 W JP 2004003816W WO 2004086713 A1 WO2004086713 A1 WO 2004086713A1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
- H04L27/364—Arrangements for overcoming imperfections in the modulator, e.g. quadrature error or unbalanced I and Q levels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0016—Stabilisation of local oscillators
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0018—Arrangements at the transmitter end
Definitions
- the present invention relates to the calibration of quadrature modulators. Background art
- Fig. 6 shows a quadrature modulation circuit according to the prior art.
- the paceband signal includes an I signal and a Q signal.
- the I signal is amplified by the amplifier 102.
- the local signal generated by the local signal source 300 is mixed by the multiplier 104.
- the Q signal is amplified by the amplifier 202.
- the phase of the local signal generated by the local signal source 300 is shifted 90 degrees by the phase shifter 304.
- the multiplier 204 mixes the Q signal amplified by the amplifier 202 with the local signal whose phase has shifted by 90 degrees.
- the output of the multiplier 104 and the output of the multiplier 204 are added by the adder 400 and output as an IF signal.
- the amplitudes of the I and Q signals may differ. Therefore, an amplitude error occurs. Therefore, it is necessary to eliminate such errors, that is, to calibrate.
- To perform calibration provide calibration signals as I and Q signals. Calibration is performed based on the signal output from the adder 400 as a result of providing the signal for calibration.
- the calibration of the demodulator is described in Japanese Patent Laid-Open Publication No.
- an object of the present invention is to provide a quadrature modulator and the like that can perform calibration without stopping the modulation operation of the quadrature modulator.
- the present invention provides an adding unit that outputs a pseudo noise superimposed signal obtained by adding a user signal and a pseudo noise, and a signal conversion that mixes the pseudo noise superimposed signal and a local signal having a predetermined local frequency to output a converted signal.
- the adding means outputs a pseudo noise superimposed signal obtained by adding the user signal and the pseudo noise.
- the signal conversion means mixes the pseudo noise superimposed signal with a local signal having a predetermined local frequency and outputs a converted signal.
- the phase shifting means outputs a phase shifted local signal obtained by changing the phase of the local signal.
- the phase shift local signal multiplying means multiplies the converted signal by the phase shift local signal.
- the correlation means correlates the output of the phase shifter-cal signal multiplication means with the pseudo noise.
- the correlation means includes pseudo noise multiplication means for multiplying the output of the phase-shift local signal multiplication means and pseudo noise, and integration means for integrating and outputting the output of the pseudo noise multiplication means. You may. Further, in the present invention, the integration section of the integration means may be set to be sufficiently longer than the cycle of the local signal.
- the integration interval of the integration means may be sufficiently longer than the period of the pseudo noise, and the period of the pseudo noise may be sufficiently longer than the period of the oral signal.
- the present invention may include an error measuring means for measuring a DC offset error, a phase error and an amplitude error from the output of the integrating means. Further, in the present invention, the error measuring means may ignore any one or more of the DC offset error, the phase error and the amplitude error, and measure the error which has not been ignored.
- the pseudo noise may be smaller than the user signal. In the present invention, the pseudo noise may be substantially equal to the floor noise.
- the user signal has an I signal and a Q signal, and includes a pseudo noise addition target signal selecting means for selecting which of the I signal and the Q signal to add the pseudo noise.
- the present invention includes first subtraction means for subtracting the user signal from the output of the phase-shift local signal multiplication means, wherein the pseudo noise multiplication means multiplies the output of the first subtraction means by the pseudo noise. Is also good.
- the present invention provides a pseudo noise addition target signal selecting means for selecting which of the I signal and the Q signal to add the pseudo noise to, wherein the user signal has an I signal and a Q signal, A subtraction target signal selection unit that sets the user signal given to the subtraction unit to a user signal selected to add the pseudo noise may be provided.
- the present invention includes second subtraction means for subtracting a mixed signal of the user signal and the local signal from the converted signal, and the phase-shifting local signal multiplying means outputs a signal output from the second subtraction means and a local signal. May be multiplied.
- the present invention provides a pseudo-noise addition target signal selecting means for selecting which of the I signal and the Q signal to add the pseudo noise to, wherein the user signal has an I signal and a Q signal, A signal to be subtracted may be provided as a user signal to be given to the subtracting means, and a signal to be subtracted as a user signal selected to add pseudo noise.
- the present invention also provides an adding step of outputting a pseudo noise superimposed signal obtained by adding a user signal and pseudo noise, and outputting a converted signal by mixing the pseudo noise superimposed signal and a local signal having a predetermined roll frequency.
- a correlation step of correlating the output of the power signal multiplication step with the pseudo noise and an error measurement step of measuring an error of the user signal based on the output of the correlation step may be provided.
- the present invention provides an adding means for outputting a pseudo-noise superimposed signal obtained by adding a user signal and pseudo-noise, and outputting a converted signal by mixing the pseudo-noise superimposed signal and a local signal having a predetermined oral frequency.
- Signal conversion means for outputting a phase-shifted local signal in which the phase of the local signal is changed; phase-shift roll signal multiplication means for multiplying the converted signal by the phase-shifted local signal;
- the present invention provides an adding means for outputting a pseudo-noise superimposed signal obtained by adding a user signal and pseudo-noise, and outputting a converted signal by mixing the pseudo-noise superimposed signal and a local signal having a predetermined oral frequency.
- Signal conversion means a phase shift means for outputting a phase-shifted low-frequency signal obtained by changing the phase of the input signal, and a phase-shift local signal multiplication for multiplying the converted signal by the phase-shift signal
- a computer that stores a program for causing a computer to execute an error measurement process in a quadrature modulation device that includes a correlation unit that correlates the output of the phase-shifting signal multiplication unit with pseudo noise.
- the present invention includes an adding unit that outputs a pseudo noise superimposed signal obtained by adding a user signal and a pseudo noise, a modulating signal obtained by modulating the output of the adding unit, and a correlating unit that correlates the pseudo noise. It may be.
- the adding means outputs a pseudo noise superimposed signal obtained by adding the user signal and the pseudo noise.
- the correlating means correlates the modulated signal obtained by modulating the output of the adding means with the pseudo noise.
- FIG. 1 is a block diagram showing a configuration of the quadrature modulation device according to the first embodiment of the present invention.
- Figure 2 shows the output (D et) of the integrator 58 with the horizontal axis representing I and the vertical axis representing Q, with no error ( Figure 2 (a)) and an amplitude error.
- FIG. 2 (b) and those having a DC offset error and a phase error (FIG. 2 (c)).
- FIG. 18 is a diagram showing the coordinates of the output (D e t) of the integrator 58 when the angle is changed by 45 ° to 360 °.
- FIG. 4 is a block diagram showing a configuration of a quadrature modulation device according to the second embodiment of the present invention.
- FIG. 5 is a block diagram showing a configuration of the quadrature modulation device according to the third embodiment of the present invention.
- FIG. 6 is a block diagram showing a configuration of a quadrature modulation circuit according to the related art.
- FIG. 1 is a block diagram showing a configuration of the quadrature modulation device according to the first embodiment of the present invention.
- the quadrature modulator according to the first embodiment includes amplifiers 12 and 22, adders 14 and 24, signal converters 16 and 26, a pseudo-noise generator 32 and an attenuator 34, Pseudo-noise addition target signal selection unit 36, mouth-cal signal source 40, 90 degree phase shifter 42, phase fine adjustment unit 44 I, Q, phase shifter 50, adder for IF signal output 5 2, a phase shifter single signal multiplier 54, a pseudo noise multiplier 56, an integrator 58, and an error measuring unit 70.
- the amplifier 12 amplifies the I signal.
- the amplifier 22 amplifies the Q signal.
- the I and Q signals are user signals.
- the pseudo noise generator 32 generates a pseudo noise PN.
- the pseudo-noise PN is, for example, an M-sequence pseudo-random pattern that generates a long-period random pattern with a binary occurrence probability of approximately 50%. That is, In this case, 2 m- i high-level signals and 2 ⁇ -1 low-level signals are generated.
- the pseudo noise ⁇ ⁇ ⁇ here is a non-zero constant if P (t) 2 is integrated over a sufficiently long interval, if P (t) is the pseudo noise, and P (t) becomes If it is integrated over a long period of time, it is sufficient if it becomes 0. It is not necessary to limit the pseudo noise PN to an M-sequence pseudo random pattern.
- the attenuator 34 makes the level of the pseudo noise PN generated by the pseudo noise generator 32 smaller than the level of the I signal or the Q signal. It is preferable that the level of the pseudo noise PN be equal to or lower than the floor noise (for example, about -70 dBc).
- the pseudo noise addition target signal selection unit 36 selects whether to add the pseudo noise PN to the I signal or the Q signal.
- the pseudo noise addition target signal selection unit 36 is a switch. If terminal 36a and terminal 36I are connected, the pseudo noise PN is added to the I signal. If terminal 36a is connected to terminal 36Q, pseudo noise PN is added to the Q signal.
- the adder 14 adds a DC offset (D C-I) and a pseudo noise PN to the I signal amplified by the amplifier 12. However, the pseudo noise PN is added by the pseudo noise addition target signal selection unit 36. In this case, it is selected to add the pseudo noise PN to the I signal.
- the DC offset (DC-I) is a signal for adjusting the offset error of the I signal.
- the adder 24 adds a DC offset (DC-Q) and a pseudo noise PN to the Q signal amplified by the amplifier 22. However, the addition of the pseudo noise PN is performed when the pseudo noise addition target signal selection unit 36 selects the addition of the pseudo noise PN to the Q signal.
- the DC offset (DC-Q) is a signal for adjusting the offset error of the Q signal.
- a signal obtained by adding pseudo noise PN to the I signal (Q signal) is called a pseudo noise superimposed signal.
- the local signal source 40 generates a local signal having a predetermined oral frequency.
- the 90-degree phase shifter 42 shifts the phase of the oral signal by 90 degrees.
- the phase fine adjuster 4 41 finely adjusts the phase of the local signal.
- the phase fine adjuster 44Q fine-tunes the phase of the output of the 90-degree phase shifter 42.
- the phase fine adjusters 4 41 and 4 4 Q finely adjust the phase so that the phase difference between the signals output from each of them becomes exactly 90 °. That is, the phase error of the I signal and the Q signal is adjusted.
- the signal conversion section 16 has a multiplier 16a and a variable gain amplifier 16b.
- the multiplier 16a multiplies the local signal output from the phase fine adjustment unit 44 I by the output of the adder 14 and mixes. If the pseudo noise signal is added to the I signal by the adder 14, the pseudo noise superimposed signal is Will be mixed with the cull signal.
- the variable gain amplifier 16b amplifies and outputs the output of the multiplier 16a.
- the variable gain amplifier 16b adjusts the amplitude error of the I signal by changing the gain. Note that the variable gain amplifier 16b may be provided before the multiplier 16a.
- the signal conversion unit 16 outputs a converted signal obtained by mixing the pseudo noise superimposed signal with the local signal or a signal obtained by mixing the I signal with the local signal.
- the signal converter 26 includes a multiplier 26a and a variable gain amplifier 26b.
- the multiplier 26a multiplies and mixes the oral signal output from the phase fine adjustment unit 44Q and the output of the adder 24.
- the variable gain amplifier 26b amplifies and outputs the output of the multiplier 26a.
- the variable gain amplifier 26b adjusts the amplitude error of the Q signal by changing the gain. Note that the variable gain amplifier 26 b may be provided before the multiplier 26 a.
- the signal conversion unit 26 outputs a converted signal obtained by mixing the pseudo noise superimposed signal with the local signal or a signal obtained by mixing the Q signal with the local signal.
- the phase shifter 50 changes the phase of the local signal from 0 to 360 ° and outputs it.
- the phase is changed from 0 ° to 45 ° in steps of 360 °.
- the IF signal output adder 52 adds the output of the signal conversion unit 16 and the output of the signal conversion unit 26 and outputs the result.
- D Output of adder for F signal output 52 The power is the sum of the converted signal (a pseudo noise superimposed signal obtained by adding pseudo noise to the I signal (Q signal) and a local signal) and a signal obtained by mixing the Q signal (I signal) with the local signal. It was done. Since the level of the pseudo noise PN is low, the output of the IF signal output adder 52 can be used as an IF signal. In addition, a DC offset error, a phase error, and an amplitude error can be obtained using this IF signal.
- the phase shift local signal multiplier 54 multiplies the output of the phase shifter 50 by the IF signal. Since the IF signal contains the converted signal, the output of the phase shifter 50 is multiplied by the converted signal.
- the pseudo noise multiplier 56 multiplies the output of the phase shift local signal multiplier 54 by the pseudo noise PN.
- the integrator 58 integrates the output of the pseudo noise multiplier 56 and outputs the result. However, the integration interval is sufficiently longer than the local signal period and the pseudo noise PN period. However, the period of the pseudo noise is sufficiently longer than the period of the speech signal.
- the output of the integrator 58 is called Det.
- the pseudo-noise multiplier 56 and the integrator 58 correlate the output of the phase-shift local signal multiplier 54 with the pseudo-noise PN.
- ⁇ o Error measuring section 70 measures a DC offset error, a phase error, and an amplitude error based on Det.
- DC offset error, phase error At least one of the difference and the amplitude error (for example, the DC offset error) may be ignored, and the error not ignored may be measured.
- the DC offset (DC-I, DC-Q) provided to the adders 14 and 24 ⁇ the phase adjustment amount by the phase fine adjustment unit 44 I 44 Q, the variable gain amplifier 16 b, The gain of 26 b is determined. This adjusts the DC offset error, phase error, and amplitude error.
- the pseudo noise generator 32 generates a pseudo noise PN.
- the level of the pseudo noise PN is reduced by the attenuator 34 to a level below the floor noise.
- the pseudo noise addition target signal selection unit 36 inputs the signal to the adder 14 or the adder 24.
- the I signal (Q signal) is amplified by the amplifier 12 (22) and supplied to the adder 14 (24).
- the pseudo noise PN is supplied to the adder 14 (or the adder 24).
- the pseudo noise PN is added to the I signal amplified by the amplifier 12, and becomes a pseudo noise superimposed signal.
- the DC offset (DC-I) is further added to the adder 14, and the offset error of the I signal is adjusted.
- the DC offset (D CQ) is added to the Q signal amplified by the amplifier 22, and the offset and the error of the Q signal are adjusted.
- the pseudo noise PN is given to the adder 24, the pseudo noise PN is added to the Q signal amplified by the amplifier 22 to form a pseudo noise superimposed signal.
- the DC offset (DC-Q) is further added to the adder 24 to adjust the offset error of the Q signal.
- the DC offset (DC-I) is added to the I signal amplified by the amplifier 12 to adjust the offset error of the I signal.
- the local signal source 40 generates a local signal having a predetermined local frequency.
- the oral signal is supplied to the signal conversion unit 16 via the phase fine adjustment unit 44 1.
- the local signal is supplied to the signal conversion unit 26 via the 90-degree phase shifter 42 and the phase fine adjustment unit 44Q.
- the pseudo noise PN is given to the adder 14, the oral signal is mixed with the pseudo noise superimposed signal output from the adder 14 by the multiplier 16a. If the I signal is I (t), the pseudo noise PN is P (t), and the oral signal is cosw t, the output of the multiplier 16a is
- the output of the multiplier 16a is amplified by the variable gain amplifier 16b. This adjusts the amplitude error of the I signal. Further, the oral signal (the phase is shifted by 90 °) is mixed with the signal output from the adder 24 by the multiplier 26a. Assuming that the Q signal is Q (t) and the oral signal is cosc t, the output of the multiplier 26 a is
- the output of the multiplier 26a is amplified by the variable gain amplifier 26b. This adjusts the amplitude error of the Q signal.
- the outputs of the signal conversion unit 16 and the signal conversion unit 26 are added by an IF signal output adder 52 to obtain an F signal. Therefore, it is possible to obtain an IF signal, that is, perform modulation. Since the level of the pseudo noise PN is low, there is no problem when using an IF signal as a modulation signal.
- the local signal generated by the local signal source 40 is supplied to the phase-shifted local signal multiplier 54 via the phase shifter 50.
- the IF signal and the output of the phase shifter 50 are multiplied by a phase shift local signal multiplier 54. Assuming that the output of the phase shifter 50 is cos (wt + 0) (however, the amount of the phase shifted by the phase shifter 50), the output of the phase shifter one signal multiplier 54 is
- the integrator 58 integrates the output of the pseudo noise multiplier 56 and outputs the result. However, the integration interval is sufficiently longer than the period of the oral signal and the period of the pseudo noise. However, the period of the pseudo noise is sufficiently longer than the period of the oral signal.
- the output of integrator 58 is SP (t) ((I (t) + P (t)) coswt + Q (t) sinwt) coswt
- c is a constant of a certain value. If P (t) is integrated over a sufficiently long interval, it becomes 0, and the term of P (t) disappears. If sin2 ⁇ t is integrated over a sufficiently long interval, it becomes 0, and the term of sin2wt disappears. If P (t) 2 is integrated over a sufficiently long interval, it will be a non-zero constant, so c will be a constant of some value.
- the output of the integrator 58 is given as Det to the error measuring unit 70.
- the case where the pseudo noise PN is given to the adder 14 has been described. However, the pseudo noise PN may be given to the adder 24. In this case, the output of multiplier 16a is
- Det becomes a circle with radius c as shown in Fig. 2 (a).
- this means that DC offset, phase and amplitude errors This is the case where it is assumed that there is not. In practice, these errors exist. For example, suppose that there is an amplitude error, and the I signal becomes m 1 times and the Q signal becomes m 2 times. In this case, as shown in Fig. 2 (b), the radius on the I axis is ml times and the radius on the Q axis is m2 times. Further, it is assumed that there is a DC offset error of I 0 for the I signal and Qo for the Q signal, and a phase error. Then, as shown in Fig.
- the error measuring unit 70 receives Det, and measures DC offset error, phase error, and amplitude error in the IQ coordinate system as shown in FIG.
- ⁇ is changed from 0 ° to 45 ° in increments of 45 ° to 360 °
- the coordinates of eight points are obtained as shown in FIG.
- the error can be measured by calculating the major axis, minor axis, center, and inclination of the ellipse from the coordinates of the eight points.
- Fig. 3 when a, b ⁇ r1, r2 are taken, the phase error ⁇ is
- the IF signal output adder 52 mixes the converted signal (a pseudo noise superimposed signal obtained by adding pseudo noise to the I signal (Q signal) with a local signal) and Q A signal obtained by adding the signal (I signal) and the signal obtained by mixing the local signal and the local signal is obtained.
- This signal can be treated as an IF signal because the level of the pseudo noise PN is low.
- error measuring section 70 can measure the DC offset error, phase error, and amplitude error. This makes it possible to calibrate these errors. Therefore, it is possible to acquire the IF signal, that is, acquire the DC offset error and the like while performing the modulation, and further perform the calibration of the I signal and the Q signal.
- FIG. 4 is a block diagram showing a configuration of a quadrature modulation device according to a second embodiment of the present invention.
- the quadrature modulation device includes Steps 1, 2, 2, Adders 14, 24, Signal Converters 16, 26, Pseudo Noise Generator 32, Attenuator 34, Pseudo Noise Addition Target Signal Selector 36, Mouthpiece CAL signal source 40, 90-degree phase shifter 42, fine phase adjuster 41, Q, phase shifter 50, IF signal output adder 52, phase shifter cull signal multiplier 54 , Pseudo noise multiplier 56, integrator 58, first subtractor 60, subtraction target signal selector 61, amplifier 62, adder 64, variable gain amplifier 68, and error measuring unit 70 .
- the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
- the multiplier 56, the integrator 58, and the error measuring unit 70 are the same as in the first embodiment.
- the pseudo noise multiplier 56 multiplies the output of the first subtractor 60 by the pseudo noise PN.
- the first subtractor 60 subtracts the I signal or the Q signal from the output of the phase shift local signal multiplier 54.
- the I signal or the Q signal is supplied to the first subtractor 60 via the signal selection unit for subtraction 61, the amplifier 62, the adder 64, and the variable gain amplifier 68.
- the subtraction target signal selection unit 61 sets the user signal supplied to the first subtractor 60 as an I signal or a Q signal.
- the user signal given to the first subtractor 60 is a user signal for which the pseudo noise PN is given by the pseudo noise addition target signal selection unit 36.
- pseudo noise PN is Signal (Q signal)
- the subtraction target signal selector 61 sets the user signal to be supplied to the first subtractor 60 as an I signal (Q signal).
- the subtraction target signal selection unit 61 is a switch.
- the first subtractor 60 is supplied with the I signal. If the terminal 61 a is connected to the terminal 61 Q, the Q signal is given to the first subtractor 60.
- the amplifier 62 obtains the I signal or the Q signal from the subtraction target signal selection section 61 and amplifies it.
- the adder 64 adds a DC offset (DC-R) to the output of the amplifier 62.
- the DC offset (DC-R) is a signal for adjusting the offset error of the input signal or the Q signal. DC-R stands for reference.
- the user signal provided to the first subtractor 60 can be regarded as a reference signal.
- the variable gain amplifier 68 amplifies the output of the adder 64 and outputs the result.
- the variable gain amplifier 68 adjusts the amplitude error of the I signal or the Q signal by changing the gain.
- the pseudo noise generator 32 generates a pseudo noise PN.
- the level of the pseudo noise PN is reduced by the attenuator 34 to a level below the floor noise.
- the signal is added to the adder 14 or the adder 24 by the pseudo noise addition target signal selection unit 36.
- the I signal (Q signal) is amplified by the amplifier 12 (22) and supplied to the adder 14 (24).
- the pseudo noise PN is supplied to the adder 14 (or the adder 24).
- the pseudo noise PN When the pseudo noise PN is given to the adder 14, the pseudo noise PN is added to the I signal amplified by the amplifier 12, and becomes a pseudo noise superimposed signal.
- the DC offset (DC-I) is further added to the adder 14, and the offset error of the I signal is adjusted.
- a DC offset (DC-Q) is added to the Q signal amplified by the amplifier 22, and the offset error of the Q signal is adjusted.
- the pseudo noise PN is given to the adder 24, the pseudo noise PN is added to the Q signal amplified by the amplifier 22 to form a pseudo noise superimposed signal.
- the DC offset (DC-Q) is further added to the adder 24, and the offset error of the Q signal is adjusted.
- the DC offset (DC-I) is added to the I signal amplified by the amplifier 12, and the offset error of the I signal is adjusted.
- the local signal source 40 generates a local signal having a predetermined local frequency.
- the local signal is supplied to the signal conversion unit 16 via the phase fine adjustment unit 44I.
- the local signal is supplied to the signal conversion unit 26 via the 90-degree phase shifter 42 and the phase fine adjustment unit 44Q.
- the pseudo noise PN is given to the adder 14, the oral signal is mixed with the pseudo noise superimposed signal output from the adder 14 by the multiplier 6a.
- the output of the multiplier 16a is amplified by the variable gain amplifier 16b. This adjusts the amplitude error of the I signal.
- the local signal (the phase is shifted by 90 °) is mixed with the signal output from the adder 24 by the multiplier 26a. Assuming that the Q signal is Q (t) and the local signal is coswt, the output of the multiplier 26a is Q (t) sinwt... (32)
- the output of the multiplier 26a is amplified by the variable gain amplifier 26b. This adjusts the amplitude error of the Q signal.
- the outputs of the signal converters 16 and 26 are added by an IF signal output adder 52 to form an IF signal. Therefore, acquisition of an IF signal, that is, modulation can be performed. Since the level of the pseudo noise PN is low, there is no problem when the IF signal is used as a modulation signal. Further, the local signal generated by the local signal source 40 is provided to the phase-shifted local signal multiplier 54 via the phase shifter 50.
- phase shifter cull signal multiplier 54 The IF signal and the output of the phase shifter 50 are multiplied by a phase shift local signal multiplier 54. Assuming that the output of the phase shifter 50 is cos (t + (however, the amount of the phase shifted by the phase shifter 50)), the output of the phase shifter cull signal multiplier 54 is
- the I signal or the Q signal is selected by the subtraction target signal selection section 61 and supplied to the amplifier 62.
- the I signal is given to the amplifier 62.
- the I signal is amplified by the amplifier 62 and supplied to the adder 64.
- a DC offset (DC-R) is added to the I signal amplified by the amplifier 62, and the offset error of the I signal is adjusted.
- the output of the adder 64 is amplified by the variable gain amplifier 68. As a result, the amplitude error of the I signal is adjusted.
- the output of the phase-shift local signal multiplier 54 and the output of the variable gain amplifier 68 are supplied to a first subtractor 60.
- the first subtractor 60 subtracts the output of the variable gain amplifier 68 from the output of the phase shift roll signal multiplier 54.
- the output of the variable gain amplifier 68 is I (t).
- the output of the first subtractor 60 is
- the dynamic range of the pseudo noise multiplier 56 may be lower than that of the first embodiment. If the term of I (t) cannot be ignored (first embodiment), the dynamics of the pseudo-noise multiplier 56 I need to raise my cleanse. The pseudo noise multiplier 56 multiplies the output of the first subtractor 60 by the pseudo noise PN. Subsequent operations are the same as in the first embodiment. According to the second embodiment, the same effects as in the first embodiment can be obtained. Moreover, the dynamic range of the pseudo noise multiplier 56 may be low. Third embodiment
- FIG. 5 is a block diagram showing a configuration of a quadrature modulation device according to the third embodiment of the present invention.
- the quadrature modulator includes amplifiers 12 and 22, adders 14 and 24, signal converters 16 and 26, a pseudo-noise generator 32 and an attenuator 34 and Pseudo-noise addition target signal selection unit 36, oral signal source 40, 90-degree phase shifter 42, switch 43, phase fine adjustment unit 441, QsR phase shifter 50, IF signal Output adder 52, phase-shifted local signal multiplier 54, pseudo-noise multiplier 56, integrator 58, subtraction target signal selector 61, amplifier 62, adder 64, multiplier 66 A variable gain amplifier 68, an error measuring unit 70, and a second subtractor 80.
- the multiplier 56, the integrator 58, and the error measuring unit 70 are the same as in the first embodiment.
- the phase shift local signal multiplier 54 multiplies the output of the phase shifter 50 by the output of the second subtractor 80.
- the subtraction target signal selection unit 61, the amplifier 62, and the adder 64 are the same as in the second embodiment.
- the switch 43 is connected to the local signal generated by the local signal source 40 (when the subtraction signal selection unit 61 selects the I signal) or the output of the 90-degree phase shifter 42 (the subtraction signal selection unit). 6 When 1 selects the Q signal) to the fine phase adjuster 4 4 R.
- the phase fine adjuster 44R adjusts the phase of its output to match the I signal or Q signal. That is, the phase error is adjusted.
- Multiplier 66 multiplies the output of phase fine adjustment section 44 R by the output of adder 64 and outputs the result. This mixes the I or Q signal with the low signal.
- Variable gain amplifier 68 amplifies the output of multiplier 66 and outputs the result.
- the variable gain amplifier 68 adjusts the amplitude error of the I signal or the Q signal by changing the gain.
- the variable gain amplifier 6 8 is a multiplier 6 6 It may be provided before.
- the second subtractor 80 subtracts the output of the variable gain amplifier 68 from the output of the IF signal output adder 52.
- the pseudo noise generator 32 generates a pseudo noise PN.
- the level of the pseudo noise PN is reduced by the attenuator 34 to a level below the floor noise.
- the pseudo noise addition target signal selection unit 36 inputs the signal to the adder 14 or the adder 24.
- the I signal (Q signal) is amplified by the amplifier 12 (22) and supplied to the adder 14 (2).
- the pseudo noise PN is supplied to the adder 14 (or the adder 24).
- the pseudo noise PN is added to the I signal amplified by the amplifier 12, and becomes a pseudo noise superimposed signal.
- the DC offset (DC-I) is further added to the adder 14, and the offset error of the I signal is adjusted.
- a DC offset (DC-Q) is added to the Q signal amplified by the amplifier 22, and the offset error of the Q signal is adjusted.
- the pseudo noise PN is given to the adder 24, the pseudo noise PN is added to the Q signal amplified by the amplifier 22 to form a pseudo noise superimposed signal.
- Adder 24 also has a DC offset (DC—Q). Are added to adjust the offset error of the Q signal.
- a DC offset (DC-I) is added to the I signal amplified by the amplifier 12 to adjust the offset error of the I signal.
- the oral signal source 40 generates a local signal having a predetermined local frequency.
- the oral signal is supplied to the signal conversion unit 16 via the phase fine adjustment unit 44I.
- the local signal is provided to the signal conversion unit 26 via the 90-degree phase shifter 42 and the phase fine adjustment unit 44Q.
- the pseudo noise PN is provided to the adder 14, the local signal is mixed with the pseudo noise superimposed signal output from the adder 14 by the multiplier 16a. If the I signal is I (t), the pseudo noise PN is P (t), and the local signal is coswt, the output of the multiplier 16a is
- the output of the multiplier 16a is amplified by the variable gain amplifier 16b. This adjusts the amplitude error of the I signal.
- the mouth signal (the phase is shifted by 90 °) is mixed with the signal output from the adder 24 by the multiplier 26a. Assuming that the Q signal is Q (t) and the local signal is coswt, the output of multiplier 26a is Q (t) sinwt... (42)
- the output of the multiplier 26a is amplified by the variable gain amplifier 26b. This adjusts the amplitude error of the Q signal.
- the outputs of the signal converters 16 and 26 are added by an IF signal output adder 52 to form an IF signal. Therefore, acquisition of IF signal, That is, modulation can be performed. Since the level of the pseudo noise PN is low, there is no problem when using the IF signal as a modulation signal.
- the I signal or the Q signal is selected by the subtraction target signal selection section 61 and supplied to the amplifier 62. Here, since the pseudo noise is given to the I signal, the I signal is given to the amplifier 62.
- the I signal is amplified by the amplifier 62 and supplied to the adder 64.
- the DC offset (DC-R) is added to the I signal amplified by the amplifier 62, and the offset error of the I signal is adjusted.
- the output of adder 64 is provided to multiplier 66.
- the multiplier 66 mixes the I signal with the low-level signal. Then, it is amplified by the variable gain amplifier 68. Thereby, the amplitude error of the I signal is adjusted.
- the output of the variable gain amplifier 68 is I (t) coswt. Unlike the second embodiment, since the local signals are mixed, it does not become I (t).
- the second subtracter 80 subtracts the output of the variable gain amplifier 68 from the output of the IF signal output adder 52.
- the output of the second subtractor 80 is
- phase shifter 50 The output of the second subtractor 80 and the output of the phase shifter 50 are multiplied by a phase shift local signal multiplier 54. Assuming that the output of the phase shifter 50 is cos ( ⁇ +) (however, the amount of phase moved by the phase shifter 50), the output of the phase shifter local signal multiplier 54 is
- the output of the phase shifter signal multiplier 54 is multiplied by the pseudo noise PN by the pseudo noise multiplier 56 and integrated by the integrator 58.
- the integration interval is sufficiently longer than the period of the pseudo noise PN and sufficiently longer than the period of the local signal. However, the period of the pseudo noise PN is sufficiently longer than the period of the speech signal.
- if , the output of the integrator 58 is
- the dynamic range of the pseudo noise multiplier 56 may be lower than that of the first embodiment. If the term of I (t) cannot be ignored (first embodiment), the dynamic range of the pseudo noise multiplier 56 must be increased. Subsequent operations are the same as in the first embodiment. According to the third embodiment, effects similar to those of the first embodiment are achieved. Moreover, the dynamic range of the pseudo noise multiplier 56 may be low.
- each of the above parts (for example, erroneous data) is added to the media reading device of the convenience provided with the CPU hard disk and the media (floppy disk, CD-ROM, etc.) reading device. Read the medium on which the program for realizing the difference measuring section 70) is recorded and install it on the hard disk.
- Such a method can also realize a quadrature modulator. .
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Amplifiers (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/549,629 US7358828B2 (en) | 2003-03-24 | 2004-03-22 | Orthogonal modulation device, method, program, recording medium, and modulation device |
DE112004000516T DE112004000516B4 (de) | 2003-03-24 | 2004-03-22 | Vorrichtung zur Orthogonalmodulation, Verfahren, Programm, Aufzeichnungsmedium und Modulationsvorrichtung |
JP2005504033A JP4344357B2 (ja) | 2003-03-24 | 2004-03-22 | 直交変調装置、方法、プログラム、記録媒体および変調装置 |
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JP2003-079475 | 2003-03-24 | ||
JP2003079475 | 2003-03-24 |
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WO2004086713A1 true WO2004086713A1 (ja) | 2004-10-07 |
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PCT/JP2004/003816 WO2004086713A1 (ja) | 2003-03-24 | 2004-03-22 | 直交変調装置、方法、プログラム、記録媒体および変調装置 |
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US (1) | US7358828B2 (ja) |
JP (1) | JP4344357B2 (ja) |
KR (1) | KR100726835B1 (ja) |
CN (1) | CN100521675C (ja) |
DE (1) | DE112004000516B4 (ja) |
TW (1) | TWI249925B (ja) |
WO (1) | WO2004086713A1 (ja) |
Cited By (1)
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JP2008205810A (ja) * | 2007-02-20 | 2008-09-04 | Matsushita Electric Works Ltd | ダイレクトコンバージョン方式の無線送受信装置 |
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JP3902184B2 (ja) * | 2004-02-24 | 2007-04-04 | 株式会社アドバンテスト | 直交変調装置、方法、プログラム、記録媒体 |
JP4772792B2 (ja) * | 2005-07-26 | 2011-09-14 | 株式会社アドバンテスト | シンボル変調精度測定装置、方法、プログラムおよび記録媒体 |
JP4889330B2 (ja) * | 2006-03-20 | 2012-03-07 | 株式会社アドバンテスト | 信号解析装置、方法、プログラム、記録媒体 |
JP3970909B1 (ja) * | 2006-04-17 | 2007-09-05 | 株式会社アドバンテスト | 変調器 |
DE102006032961A1 (de) * | 2006-07-17 | 2008-02-21 | Rohde & Schwarz Gmbh & Co. Kg | Verfahren und System zur Ermittlung der Abhängigkeit zwischen Geräteparametern eines Mobilfunkgeräts und Signalgrößen |
TWI426397B (zh) * | 2009-06-29 | 2014-02-11 | Lee Ming Inst Technology | Can be used in a signal interval in the unequal spacing of the sample, the signal in this interval between a single and multiple numerical integration device. |
CN102340467B (zh) * | 2011-05-19 | 2014-06-04 | 乐鑫信息科技(上海)有限公司 | 一种调制解调器失配的校准方法 |
CN110441741A (zh) * | 2019-07-11 | 2019-11-12 | 纳瓦电子(上海)有限公司 | 一种实现正交幅度调制的方法 |
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JP2000022592A (ja) * | 1998-07-06 | 2000-01-21 | Canon Inc | 送受信装置、変調制御方法及び記憶媒体 |
JP2001505016A (ja) * | 1996-11-29 | 2001-04-10 | ノキア テレコミュニカシオンス オサケ ユキチュア | デジタル直角変調及び復調方法、並びにデジタル直角変調器及び復調器 |
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US4736390A (en) * | 1986-10-15 | 1988-04-05 | Itt Avionics, A Division Of Itt Corporation | Zero IF radio receiver apparatus |
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JP2579843B2 (ja) * | 1994-11-08 | 1997-02-12 | エバーコーン インク | 澱粉エステルの製造方法、澱粉エステル、及び澱粉エステル組成物 |
US5784402A (en) * | 1995-01-09 | 1998-07-21 | Kamilo Feher | FMOD transceivers including continuous and burst operated TDMA, FDMA, spread spectrum CDMA, WCDMA and CSMA |
JP4360739B2 (ja) | 1999-05-24 | 2009-11-11 | 株式会社アドバンテスト | 直交復調装置、方法、記録媒体 |
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- 2004-03-22 DE DE112004000516T patent/DE112004000516B4/de not_active Expired - Fee Related
- 2004-03-22 US US10/549,629 patent/US7358828B2/en active Active
- 2004-03-22 KR KR1020057017820A patent/KR100726835B1/ko not_active IP Right Cessation
- 2004-03-22 WO PCT/JP2004/003816 patent/WO2004086713A1/ja active IP Right Grant
- 2004-03-22 CN CNB2004800082114A patent/CN100521675C/zh not_active Expired - Fee Related
- 2004-03-22 JP JP2005504033A patent/JP4344357B2/ja not_active Expired - Fee Related
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JPH09504673A (ja) * | 1994-06-06 | 1997-05-06 | エリクソン インコーポレイテッド | 自己調節変調器 |
JP2001505016A (ja) * | 1996-11-29 | 2001-04-10 | ノキア テレコミュニカシオンス オサケ ユキチュア | デジタル直角変調及び復調方法、並びにデジタル直角変調器及び復調器 |
JP2000022592A (ja) * | 1998-07-06 | 2000-01-21 | Canon Inc | 送受信装置、変調制御方法及び記憶媒体 |
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JP2008205810A (ja) * | 2007-02-20 | 2008-09-04 | Matsushita Electric Works Ltd | ダイレクトコンバージョン方式の無線送受信装置 |
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JP4344357B2 (ja) | 2009-10-14 |
TW200423648A (en) | 2004-11-01 |
KR100726835B1 (ko) | 2007-06-11 |
TWI249925B (en) | 2006-02-21 |
KR20050121212A (ko) | 2005-12-26 |
US7358828B2 (en) | 2008-04-15 |
JPWO2004086713A1 (ja) | 2006-06-29 |
DE112004000516T5 (de) | 2006-03-09 |
DE112004000516B4 (de) | 2009-09-17 |
US20060133537A1 (en) | 2006-06-22 |
CN1765098A (zh) | 2006-04-26 |
CN100521675C (zh) | 2009-07-29 |
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