wireless transmission device

Abstract

To reduce unwanted waves.SOLUTION: A radio transmission device of the invention includes a BB signal generation part for generating a baseband signal, an IF signal generation part for converting the baseband signal to an IF signal, and an RF signal generation part for converting the IF signal to an RF signal, and outputs the RF signal to an antenna. The radio transmission device of this invention includes a BB adjustor for adjusting amplitude of the baseband signal, an RF adjustor for adjusting amplitude of the RF signal, and a control part. The control part extracts a part of the RF signal to the antenna, obtains an evaluation value for evaluating the relationship between a desired wave and an unwanted wave, and controls the BB adjustor and the RF adjustor based on the evaluation value.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a wireless transmission device for performing wireless transmission at high frequencies. [Background technology]

[0002] In sixth-generation mobile communications, in order to realize wireless communications exceeding 100 Gb / s, in addition to conventional submillimeter waves, the use of frequency bands above 100 GHz as wireless carrier frequencies, which have the potential to secure wide bandwidth, is being considered.

[0003] FIG. 1 shows the configuration of a conventional wireless transmission device for performing amplitude / phase modulation or quadrature modulation. In the wireless transmission device 900, a baseband signal generator 910 generates a baseband signal including an I-channel signal Data (I) and a Q-channel signal Data (Q), and inputs the signal to an IF signal generator 920. The IF signal generator 920 converts the baseband signal into an IF signal (intermediate frequency signal). Specifically, the IF signal generator 920 includes a local oscillator 921 with a frequency LO1, IF mixers 922 and 924, a phase converter 923, and an IF amplifier 925. The IF signal generator 920 includes the local oscillator 921, the IF mixer 922, the IF mixer 924, and the phase converter 923 forming a quadrature mixer 926 (a mixer driven by local oscillation signals that are 90° out of phase with each other). The quadrature mixer 926 generates an IF signal with a center frequency of LO1. The IF signal is amplified by IF amplifier 925 and then input to RF signal generator 930. RF signal generator 930 includes local oscillator 931 with frequency LO2, RF mixer 932, and RF amplifier 933. RF mixer 932 multiplies the IF signal by a local oscillation signal with frequency LO2 and converts it to an RF signal. Finally, RF amplifier 933 (often a power amplifier) ​​amplifies the RF signal to a power level required for wireless communication and radiates it into space via antenna 940. Here, a low frequency band (typically several GHz to 10-plus GHz) in which local oscillator 921, IF mixers 922 and 924, and phase converter 923 constituting IF signal generator 920 have good performance is selected for LO1, which is the center frequency of the IF signal. Furthermore, if the conversion gain of the quadrature mixer is sufficiently large, IF amplifier 925 between IF signal generator 920 and RF mixer 932 may be omitted. Since the frequency band of the RF signal is above 100 GHz, the frequency LO2 of the local oscillation signal that drives RF mixer 932 is selected to be the sum or difference of the RF frequency above 100 GHz and the IF frequency (usually around 100 GHz). [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] SA Maas, “How to model intermodulation distortion,” IEEE MTT-S International Microwave Symposium (IMS), 1991. [Non-patent document 2] J. Zanen et al, “A Predistortion-Less Digital Transmitter With -50-dB ACLR Exploitating Output Conductance Linearization,” IEEE Solid-State Circuits Letters (SSC-L), Vol. 4, 2001. Summary of the Invention [Problem to be solved by the invention]

[0005] However, when implementing wireless systems above 100 GHz, imperfections in amplifiers and other hardware components of wireless transmission equipment can degrade communication quality. This is due to the imperfections of amplifiers, particularly their nonlinearity, which become significant in frequency bands above 100 GHz. The nonlinear characteristics of amplifiers cause intermodulation distortion (IMD), which reduces the signal-to-noise ratio (SNR) of RF signals and generates adjacent channel leakage power (ACP), which can cause interference with other wireless systems. Therefore, it is important to minimize IMD, especially in frequency bands above 100 GHz.

[0006] This will be explained more specifically. In frequency bands above 100 GHz, amplifier imperfections, particularly nonlinearity, become significant. This is due to the fact that the characteristics (gain, linearity, etc.) of electronic devices such as transistors contained in the amplifier deteriorate as the frequency increases. The nonlinear characteristics of the amplifier generate intermodulation distortion (IMD) (Non-Patent Document 1). Figure 2 shows an overview of the spectrum of an RF signal containing unwanted waves (the spectrum at P0 in Figure 1). As shown in Figure 2, unwanted waves 200 overlapping the signal bandwidth of desired wave 300 reduce the signal-to-noise ratio (SNR) of the RF signal, and unwanted waves 200 occurring outside the signal bandwidth of desired wave 300 generate adjacent channel leakage power (ACP), which causes interference with other wireless systems (Non-Patent Document 2). Therefore, in frequency bands above 100 GHz, it is important to reduce unwanted waves 200 as much as possible.

[0007] The present invention has been made in view of the above problems, and has as its object to reduce unwanted waves. [Means for solving the problem]

[0008] A wireless transmission device of the present invention includes a BB signal generator that generates a baseband signal, an IF signal generator that converts the baseband signal to an IF signal, and an RF signal generator that converts the IF signal to an RF signal, and outputs the RF signal to an antenna. The wireless transmission device of the present invention also includes a BB adjuster that adjusts the amplitude of the baseband signal, an RF adjuster that adjusts the amplitude of the RF signal, and a control unit. The control unit extracts a portion of the RF signal to the antenna, obtains an evaluation value that evaluates the relationship between the desired wave and the unwanted wave, and controls the BB adjuster and RF adjuster based on the evaluation value. [Effects of the Invention]

[0009] According to the wireless transmission device of the present invention, the amplitude of the baseband signal and the amplitude of the RF signal are adjusted based on an evaluation value that evaluates the relationship between the desired wave and the unwanted wave, thereby reducing the unwanted wave. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing the configuration of a conventional wireless transmission device for performing amplitude-phase modulation or quadrature modulation. [Figure 2] FIG. 1 is a diagram showing an overview of the spectrum of an RF signal including IMD (unwanted waves) (the spectrum at P0 in FIG. 1). [Figure 3] FIG. 1 is a diagram showing an example of the functional configuration of a wireless transmission device according to the present invention. [Figure 4] FIG. 4 is a diagram showing an overview of the signals at the locations shown in FIG. 3. [Figure 5] FIG. 10 is a diagram showing a modified example of the functional configuration of the wireless transmission device of the present invention. [Figure 6] This figure shows the parameters (gain, OIP3, NF) of the components used in the SNDR calculation in the configuration of Figure 3. [Figure 7] 10 is a diagram showing the calculation results of SNDR when the gain of RF regulator 137 (hereinafter referred to as "RF control gain") is set to 0 dB and the gain of BB regulators 117 and 118 (hereinafter referred to as "BB control gain") is changed from -80 dB to 0 dB. [Figure 8] This figure shows the calculation results of SNDR when the RF control gain is changed while the BB control gain is fixed at -41 dB, the value at which the maximum SNDR was obtained in Figure 7. [Figure 9] FIG. 10 shows the calculation results of SNDR when the RF control gain is set to 0 dB, −10 dB, −20 dB, and −30 dB and the BB control gain is changed from −60 to 0 dB in each case. [Figure 10] FIG. 10 is a diagram showing the calculation results of the BB control gain that maximizes the SNDR when the RF control gain is changed. [Figure 11] FIG. 10 is a diagram showing calculation results when the IF control gain is also controlled. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described in detail. Components having the same functions are given the same numbers, and duplicated explanations will be omitted. [Example]

[0012] Fig. 3 shows an example of the functional configuration of a wireless transmission device of the present invention. Fig. 4 is a diagram showing an overview of signals at the positions shown in Fig. 3. The horizontal axis of Fig. 4 represents frequency, and the vertical axis represents intensity. Wireless transmission device 100 includes a BB signal generating unit 110 that generates a baseband signal, an IF signal generating unit 120 that converts the baseband signal into an IF signal, an RF signal generating unit 130 that converts the IF signal into an RF signal, and a control unit 190, and outputs the RF signal to antenna 940.

[0013] The BB signal generation unit 110 includes a BB adjuster 119 that adjusts at least the amplitude of the baseband signal. The BB adjuster 119 may also adjust the phase of the baseband signal. The BB signal generation unit 110 generates a baseband signal including an I-channel signal Data (I) and a Q-channel signal Data (Q). The BB adjuster 119 includes a BBI adjuster 117 that adjusts the amplitude and phase of the I-channel signal, and a BBQ adjuster 118 that adjusts the amplitude and phase of the Q-channel signal. The control unit 190 controls the BBI adjuster 117 and the BBQ adjuster 118.

[0014] The IF signal generating unit 120 includes a local oscillator 921 with a frequency LO1, IF mixers 922 and 924, a phase converter 923, an IF amplifier 925, and an IF adjuster 127. In the IF signal generating unit 120, the local oscillator 921, the IF mixer 922, the IF mixer 924, and the phase converter 923 form a quadrature mixer 926 (a mixer driven by local oscillation signals that are 90° out of phase with each other). The quadrature mixer 926 generates an IF signal with a center frequency of LO1. The IF signal is amplified by the IF amplifier 925 and then input to the RF signal generating unit 930. The IF adjuster 127 adjusts the amplitude and phase of the IF signal. In the present invention, the IF adjuster 127 may not be provided, or may have a function to adjust only the amplitude. The reason for this will be explained later.

[0015] RF signal generating unit 130 includes a local oscillator 931 of frequency LO2, an RF mixer 932, an RF amplifier 933, and an RF adjuster 137. The IF signal is multiplied by the local oscillator signal of frequency LO2 by RF mixer 932 and frequency-converted to an RF signal. RF adjuster 137 adjusts at least the amplitude of the RF signal. RF adjuster 137 may also adjust the phase of the RF signal. The adjusted RF signal is amplified by RF amplifier 933 (which is often a power amplifier) ​​to a power value required to achieve wireless communication.

[0016] Control unit 190 extracts a portion of the RF signal to antenna 940, obtains an evaluation value for evaluating the relationship between the desired wave and the unwanted wave, and controls at least BB adjuster 119 and RF adjuster 137 based on the evaluation value. The evaluation value for evaluating the relationship between the desired wave and the unwanted wave is SNR = Desired signal power / Noise power (Equation 1) SNDR = Desired signal power / (Noise power + Third-order cross distortion) (Equation 2) However, it is not limited to these. Other evaluation values ​​may be used. For example, (power of desired wave / power of unwanted wave in ACP portion) may be used as the evaluation value.

[0017] The control unit 190 will be described in detail. The control unit 190 includes a coupler 195, a desired wave power detection unit 191, an IF band unwanted signal extraction unit 192, a low-frequency unwanted signal extraction unit 193, an unwanted power detection unit 172, and a calculation unit 180. The desired wave power detection unit 191 detects the power of a desired wave 300 in the RF signal. The IF band unwanted signal extraction unit 192 extracts an unwanted wave 200 in the RF signal as an IF band unwanted signal 220, which is a signal in the frequency band of the IF signal, using a local oscillator 931 in the RF signal generation unit 130. The low-frequency unwanted signal extraction unit 193 lowers the frequency of the IF band unwanted signal 220 using a local oscillator 921 in the IF signal generation unit 120, and extracts a low-frequency unwanted signal 230. The unwanted power detection unit 172 detects the power of the low-frequency unwanted signal 230 (the power of the unwanted wave 200 of the ACP). The calculation unit 180 calculates an evaluation value for evaluating the relationship between the desired wave 300 and the unwanted wave 200, and controls the BBI adjuster 117, the BBQ adjuster 118, the IF adjuster 127, and the RF adjuster 137 based on the evaluation value.

[0018] The coupler 195 extracts a portion (typically about 1 / 10 to 1 / 100) of the RF signal. The signal shown in FIG. 4A is the signal at point P1, and its center frequency is the frequency f RF 4A, the ratio of unwanted waves 200 to desired waves 300 is high.

[0019] The extracted RF signal is distributed to a desired wave power detector 191 and an IF band unwanted signal extractor 192. The desired wave power detector 191 is composed of a bandpass filter 150 that passes the signal bandwidth of the desired wave, and a power meter 170. The output from the power meter 170 is the power of the desired wave. Generally, the minimum received power of a power meter in a frequency band above 100 GHz is about -30 dBm. Since the output power of a normal wireless transmission device is about 0 dBm, if the coupling degree of the coupler 195 is 1 / 100 (about -20 dB), the power input to the power meter will be -20 dBm, making it possible to measure the power value.

[0020] On the other hand, it is difficult to measure the undesired wave 200 in the same way as the desired wave 300. Typically, the level of the undesired wave 200 is at least 20 dB lower than the desired wave 300. Therefore, even if the power of the desired wave 300 is 0 dBm, the power value of the undesired wave 200 will be -40 dBm or less when the coupling degree of the coupler 195 is taken into account (1 / 100), and it cannot be detected by a power meter. If the power value of the undesired wave 200 can be converted to near DC (low frequency), it is possible to measure a power value as low as -70 dBm using a high-resolution analog-to-digital converter (ADC). Therefore, in this invention, the power of the ACP portion of the undesired wave 200 is measured using the following configuration.

[0021] The IF band unwanted signal extraction unit 192 is composed of a filter 151, an RF mixer 161, and a filter 152. The filter 151 transmits the ACP portion. FIG. 4B shows the transmission characteristic F151 of the filter 151 and a signal 210 (signal at point P2) of the transmitted ACP portion (thick line portion). The RF mixer 161 multiplies the signal 210 by a local oscillation signal of frequency LO2 output by the local oscillator 931 of the RF signal generation unit 130. FIG. 4C shows the output signal of the RF mixer 161 (signal at point P3). The output signal of the RF mixer 161 includes a signal 221 having the sum of the ACP frequency and LO2, and a signal 220 having the difference frequency. The signal 220 having the difference frequency corresponds to the IF band. The filter 152 has a transmission characteristic F152 and outputs the signal 220. Therefore, only the signal 220 shown by the thick line in FIG. 4(D) (the signal at point P4) is obtained.

[0022] The low-frequency unwanted signal extraction unit 193 is made up of an IF mixer 162 and an amplifier 171. The RF mixer 162 outputs a low-frequency unwanted signal obtained by multiplying a local oscillation signal of frequency LO1 output by the local oscillator 921 of the IF signal generation unit 120 by the signal 220. Fig. 4(E) shows the low-frequency unwanted signal 230 (signal at point P5) that is the output signal of the RF mixer 161. The low-frequency unwanted signal 230 is a signal near direct current (DC).

[0023] The unwanted power detection unit 172 detects the power of the low-frequency unwanted signal 230. A detector may be used for the unwanted power detection unit 172. A diode-based square-law detector or the like may be used as the detector. However, taking into account the losses in the RF mixer 161, IF mixer 162, filter 151, and filter 152, it is expected that the power of the low-frequency unwanted signal 230 at point P5 will be low. In that case, the signal may be amplified by amplifier 171 to a power value sufficient for square-law detection, as necessary. Unlike the 100 GHz band, amplifiers with sufficient gain and linearity are available in the low-frequency band, making this low-frequency amplification easy.

[0024] Fig. 4(F) shows the waveform at point P1 when the unwanted waves have been reduced by the control of the control unit 190. The unwanted waves 250 have been reduced more than the unwanted waves 200 in Fig. 4(A). According to the wireless transmission device 100, the amplitude of at least the baseband signal and the amplitude of the RF signal are adjusted based on an evaluation value that evaluates the relationship between the desired wave and the unwanted waves, thereby reducing the unwanted waves. [Variation 1]

[0025] FIG. 5 shows a modified example of the functional configuration of the wireless transmission device of the present invention. If a 100-GHz-band amplifier 173 with a known gain and sufficient linearity is available, the measurement of the power of the unwanted waves in the ACP portion can be performed with a simpler configuration, such as the control unit 199 of the wireless transmission device 101 shown in FIG. 5. The amplifier 173 amplifies the signal 210, which is the signal obtained by filtering the ACP portion with the filter 151, to a level that can be measured by the detection unit 174 (typically, a minimum received power of approximately -30 dBm). In this case, the following conditions must be met: the gain drifts little over time, the gain is known, and the IMD generated by the amplifier 173 is relatively small. However, if such an amplifier 173 were available, the configuration shown in FIG. 3 could be simplified.

[0026] <Simulation and control method 1> The control unit 190 calculates an evaluation value that evaluates the relationship between the desired wave and the unwanted wave, and controls the amplitude and phase in the BBI adjuster 117, the BBQ adjuster 118, the IF adjuster 127, and the RF adjuster 137 based on the evaluation value. In other words, eight variables can be controlled, but the amount of calculation required to find the optimal control value increases. Therefore, first, (1) The phase is not controlled (the amount of phase shift is fixed). (2) The amplitude of the IF adjuster 127 is not controlled (the gain is fixed). (3) The amplitude control of the BBI regulator 117 and the BBQ regulator 118 is the same. In other words, only the amplitude of BB adjuster 119 and the amplitude of RF adjuster 137 are controlled. In this simulation, the following evaluation value is used to evaluate the relationship between the desired wave and the unwanted wave: SNDR = Desired signal power / (Noise power + Third-order cross distortion) (Equation 2) is used.

[0027] SNDR, which can be considered an SNR that takes distortion into account, is often used in wireless communication link design. To calculate the denominator noise power, information on the noise figure (NF) of each component in Figure 3 is required. To calculate the third-order intermodulation distortion (IM3), information on the third-order intermodulation distortion-desired signal output intercept point (OIP3), a quantity related to the value of the third-order intermodulation distortion, is also required. Figure 6 shows the parameters (gain, OIP3, NF) of the components used in this SNDR calculation for the configuration in Figure 3. The parameters of the IF mixer 922, IF amplifier 925, RF mixer 932, and RF amplifier 933 were typical for the respective frequency bands. The gain of the control elements is negative, and the phase shift is fixed, as described above. In this case, the control elements function as variable attenuators. Variable attenuators are implemented using variable resistors or other components, and because they have no gain, their linearity is generally high. Therefore, for convenience, the OIP3 of these control elements is assumed to be infinite. The input power of the baseband I-channel signal and Q-channel signal is each -3 dBm, meaning that the total input power of the baseband signals for the I-channel signal and Q-channel signal is 0 dBm. The bandwidth of the desired signal and the environmental temperature are set to 1 GHz and 290 K, respectively, and only thermal noise is considered in the noise floor calculation.

[0028] Figure 7 shows the calculation results of SNDR when the gain of RF regulator 137 (hereinafter referred to as "RF control gain") is set to 0 dB and the gain of BB regulators 117 and 118 (hereinafter referred to as "BB control gain") is changed from -80 dB to 0 dB. The horizontal axis represents BB control gain, and the vertical axis represents SNDR. It can be seen that by changing the BB control gain from 0 dB (no control) to -41 dB, the SNDR can be improved from -60 dB to 17.6 dB.

[0029] Furthermore, Figure 8 shows the calculation results of SNDR when the RF control gain is changed while the BB control gain is fixed at -41 dB, the value at which the maximum SNDR was obtained in Figure 7. By changing the RF control gain from 0 dB (no control) to -19 dB, the maximum SNDR value can be improved from 17.6 dB to 26.1 dB.

[0030] When the present invention is applied to an actual wireless transmission device, the important thing is a method (control method) for finding the values ​​of the BB control gain and RF control gain described above to maximize the SNDR. This finding method will be explained below. If the BB control gain and RF control gain are changed as parameters independently to maximize the SNDR (or an evaluation value for evaluating the relationship between the desired wave and the unwanted wave, which is used instead of the SNDR: for example, the evaluation value of Equation 1), then, assuming that there are M cases for the BB control gain and N cases for the RF control gain, then Computation amount = MN (Formula 3) For example, when M=N=100, 10,000 calculations are required, which results in a very large amount of calculations.

[0031] In the present invention, it is not necessary to change the parameters independently, and the amount of calculation can be reduced. The reason for this is explained below. FIG. 9 shows the calculation results of SNDR when the RF control gain is set to 0 dB, −10 dB, −20 dB, and −30 dB and the BB control gain is changed from −60 to 0 dB in each case. There is a certain relationship between the BB control gain and the RF control gain that give the maximum value in the four graphs in FIG. 9. When the RF control gain is large, the BB control gain that gives the maximum SNDR value becomes small. Furthermore, as can be seen from FIGS. 7 and 8, although the SNDR has a maximum point with respect to the BB control gain and the RF control gain, the response to each gain is linear in areas other than the maximum point (places other than the apex of the mountain-shaped curve). Therefore, it is expected that the relationship between the BB control gain that gives the maximum SNDR point and the RF control gain is also linear.

[0032] FIG. 10 shows the calculation results of the BB control gain that maximizes SNDR when the RF control gain is changed. From FIG. 10, it can be seen that the relationship between the two can be linearly approximated. Since a straight line is uniquely determined once two points are determined, once the two points in FIG. 10 are found, the combination of RF control gain and BB control gain that gives the maximum value of SNDR can be found without MN iterative calculations, and the largest of the maximum SNDR values ​​determined by these combinations becomes the optimal control parameter value when controlling only the amplitude of BB regulators 117 and 118 and the amplitude of RF regulator 137. In order to find the equation for the straight line, it is necessary to find the maximum value of SNDR when the BB control gain is changed for two different RF control gains (the reverse is also possible). The amount of calculation required for this is Computation amount=min(M,N)×2 (Formula 4) It can be seen that the amount of calculation can be made much smaller than the amount of calculation required when the two parameters are changed independently (Equation 3).

[0033] In other words, the control unit 190 can reduce the amount of calculation by determining the combination of the BB control gain, which is the adjustment amount of the BB adjuster 119, and the RF control gain, which is the adjustment amount of the RF adjuster 137, by taking advantage of the fact that the combination that obtains a good evaluation value is linear.

[0034] <Simulation and control method 2> Control method 1 describes a case in which the IF control gain of IF regulator 127, which is fixed, is varied. However, the phase shift amount of IF regulator 127 is fixed. Varying the IF control gain, which is the control gain of IF regulator 127, can improve SNDR more than control method 1. Figure 11 shows the calculation results when the IF control gain is also controlled. By varying the IF control gain from 0 dB (no control) to -10 dB, the maximum SNDR value can be improved to 27.5 dB, which is greater than the 26.1 dB obtained in Figure 8. Control method 2 involves three variables. To find the variables for improving SNDR, first fix the IF control gain to a certain value and vary the BB control gain and RF control gain using control method 1 to find the maximum SNDR value for a certain IF control gain. Next, fix the IF control gain to another value, and similarly vary the BB control gain and RF control gain to find the maximum SNDR value. This process can be repeated. If the number of IF control gains is K, the amount of calculation required to find the variable that will maximize the SNDR improvement is: Computation amount=min(M,N)×2×K (Formula 5) is given by

[0035] <Control method 3> Control method 3 is similar to control method 1 in that the gain and phase of both BBI adjuster 117 and BBQ adjuster 118 are changed. By changing the phases of the I channel and Q channel, it is possible to correct the phase imbalance of phase converter 923 and IF mixers 922 and 924 included in the quadrature mixer used to generate the IF signal. Furthermore, by changing the gains of the I channel and Q channel, it is possible to correct the amplitude imbalance of phase converter 923 included in the quadrature mixer and the conversion gain error of IF mixers 922 and 924.

[0036] <Control method 4> In control methods 1 to 3, the phase shift amounts of RF adjuster 137 and IF adjuster 127 are also adjusted. By controlling the phase as well, the SNDR can be further improved significantly. [Explanation of symbols]

[0037] 100,101,900 Radio transmission equipment 110,910 BB signal generator 117 BBI regulator 118 BBQ Adjuster 119 BB Adjuster 120,920 IF signal generator 127 IF adjuster 130,930 RF signal generator 137 RF adjuster 150 Bandpass Filter 151,152 Filter 161 RF Mixer 162 IF Mixer 170 Power meter 171 Amplifier 172 Unwanted power detector 173 Amplifier 174 detection unit 180 calculation unit 190, 199 control unit 191 desired wave power detection unit 192 IF band unwanted signal extraction unit 193 Low frequency unwanted signal extraction unit 195 Coupler 921,931 Local oscillator 922,924 IF mixer 923 Phase converter 925 IF amplifier 926 Quadrature Mixer 932 RF Mixer 933 Amplifier 940 Antenna

Claims

1. A wireless transmission device comprising: a BB signal generation unit that generates a baseband signal; an IF signal generation unit that converts the baseband signal into an IF signal; and an RF signal generation unit that converts the IF signal into an RF signal, and outputs the RF signal to an antenna, a BB adjuster that adjusts the amplitude of a baseband signal; an RF adjuster for adjusting the amplitude of the RF signal; a control unit that extracts a portion of an RF signal to an antenna, calculates an evaluation value that evaluates a relationship between a desired wave and an unwanted wave, and controls the BB adjuster and the RF adjuster based on the evaluation value; A wireless transmission device comprising:

2. 2. The wireless transmission device according to claim 1, The control unit determines a combination of a BB control gain, which is an adjustment amount of the BB regulator, and an RF control gain, which is an adjustment amount of the RF regulator, by utilizing linearity between the BB control gain and the RF control gain, which results in a combination that obtains a good evaluation value. A wireless transmission device characterized by:

3. 3. The wireless transmission device according to claim 1, The control unit a desired wave power detection unit that detects the power of a desired wave in an RF signal; an IF band unwanted signal extraction unit that extracts unwanted waves from the RF signal as an IF band unwanted signal, which is a signal in the frequency band of the IF signal, using a local oscillator in the RF signal generation unit; a low-frequency unwanted signal extraction unit that extracts the IF band unwanted signal as a low-frequency unwanted signal by using a local oscillator in the IF signal generation unit; an unnecessary power detection unit that detects the power of low-frequency unnecessary signals; have A wireless transmission device characterized by:

4. The wireless transmission device according to any one of claims 1 to 3, the baseband signal includes an I-channel signal and a Q-channel signal; the BB adjuster comprises a BBI adjuster for adjusting the amplitude and phase of an I-channel signal, and a BBQ adjuster for adjusting the amplitude and phase of a Q-channel signal; The control unit controls the BBI adjuster and the BBQ adjuster. A wireless transmission device characterized by:

5. 5. The wireless transmission device according to claim 4, The RF adjuster also adjusts the phase of the RF signal. A wireless transmission device characterized by:

6. The wireless transmission device according to any one of claims 1 to 3, moreover, It also includes an IF adjuster that adjusts the amplitude of the IF signal. The control unit also controls the IF adjuster. A wireless transmission device characterized by:

7. 6. The wireless transmission device according to claim 4, moreover, It also has an IF adjuster that adjusts the amplitude and phase of the IF signal. The control unit also controls the IF adjuster. A wireless transmission device characterized by:

8. 8. The wireless transmission device according to claim 6, The control unit determines the BB control gain, the IF control gain, and the RF control gain by repeating the process of determining a combination of the BB control gain and the RF control gain with the IF control gain being fixed for predetermined IF control gain candidates. A wireless transmission device characterized by:

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