JPH07235894A - Eliminating device for disturbing wave in radio communication equipment - Google Patents

Abstract

PURPOSE:To maintain a disturbing wave eliminating function continuously even in the case where a disturbing wave in a monitor receiver is interrupted by a method wherein a reception channel frequency of the monitor receiver is scanned in a prescribed range and controlling automatically a voltage variable phase shifter and a voltage variable attenuator for a channel in which a disturbing wave is acquired. CONSTITUTION:An output signal from a disturbing wave monitor receiver 100 is led to a control microcomputer 28 via an A/D converter 106, the microcomputer 28 controls a voltage variable phase shifter 23 and a voltage variable attenuator 24 so as to minimize a disturbing wave level thereby cancelling the disturbing wave. When interrupt of a disturbing wave in the monitored channel is detected, a frequency division ratio of a variable frequency divider D of a PLL circuit is changed to change a local frequency fed from a VCO to a mixer 102 thereby sequentially scanning a monitored disturbing wave channel. As a result, when a disturbing wave is in existence in other channel, a new disturbing wave is acquired and the a voltage variable phase shifter 23 and the voltage variable attenuator 24 are adjusted to minimize the reception component of the channel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for removing an interference wave in a wireless communication device, and more specifically, when an output from a transmitter arranged near a receiver becomes an interference wave of the receiver, By splitting a part of the transmission output, adjusting its phase and level, and then injecting it into the receiving device, the means for canceling and canceling the above-mentioned interfering wave can automatically detect even if the interfering wave being monitored is stopped. The present invention relates to an interfering wave removing device capable of catching another interfering wave and maintaining an interfering wave removing function.

[0002]

2. Description of the Related Art A wireless communication means is becoming more and more important as a means of communication for human beings including a car telephone system, but means and methods for effectively utilizing limited channel resources are required. Various proposals have been made. For example, a car telephone system has about 870 MHz.
A large number of channels are set in the frequency band of up to 900 MHz, and a large number of channels are also set in the frequency bands in the vicinity of the MCA. As described above, the wireless communication channels are set in the frequency bands close to each other with a predetermined interval, but there are no surplus channels anymore, and how to secure a large number of channels is an important theme.

On the other hand, at present, there is no choice but to install a plurality of radio transmitters / receivers close to each other, and this tendency is remarkable especially in a large city. However, not only the car telephone radio system and MCA, but when radio transceivers of adjacent frequency bands are installed close to each other, one transmission radio wave mixes with the other reception channel, resulting in an interfering wave and signal-to-noise. There has been a problem that the ratio (S / N) is extremely lowered, and in a remarkable case, reception becomes impossible.

Generally, in a receiver, when a desired signal having an electric field strength of about 0 dBμ is received, unless the signal level of an adjacent interfering wave is suppressed to 80 dBμ or less, the reception quality deteriorates due to the sensitivity suppression phenomenon. This is one of the performances of the receiver, and it is specified that the adjacent channel interference wave should be suppressed by 80 dB or more. However, even if the receiver satisfies this standard, the transmitters arranged close to each other. The radio wave emitted from the device often arrives at a level of, for example, 100 dBμ or more, and cannot be received due to the sensitivity suppression phenomenon. For example, channel separation in 400MHz band
At 12.5 kHz, when the transmission wave of the adjacent channel is an interference wave, it is impossible to remove this with a high frequency filter.

As a countermeasure for this, conventionally, a method as shown in FIG. 2 has been proposed. In FIG. 2, reference numeral 1 is an antenna connected to one radio equipment group, and a plurality of transmitter groups 4 are provided via a combiner 2 and a cable 3 (3-1 to 3-n).
And an antenna 5 belonging to the other radio group is installed near the antenna 1. The other antenna 5 includes a distributor 6 and a cable 7 (7-1, 7-2, ...
-Connected to n receivers via 7-n). It should be noted that in the drawing, a transmitter group is provided on one side of each radio group,
Although the other shows only the receiver group, both may have the transmitter group and the receiver group, and only one of the transmitter and receiver groups is shown for simplification of description. .

In such radio equipment, when a radio wave is emitted from the transmitter 4 and at the same time any one of the receivers of the other radio equipment receives at a channel frequency close to the transmission channel, As described above, the radio wave of 1 becomes an interfering wave, which causes a problem that communication quality is significantly impaired.

Therefore, in the example shown here, the cable of the transmitter is
First to nth cancellers 9 (9-1, 9-2 ... 9-n) are provided between the cable 3 and the cable 7 of the receiver, and the receiving antenna 5 passes from the transmitting antenna 1 through a space. In addition, the interference is eliminated by canceling the interference wave mixed in each receiver through each reception cable 7. This canceller extracts a part of the transmission radio wave from the transmission cable 3, adjusts the phase and level, and then injects it into the reception cable 7 so that it is input to the reception cable via the antenna. It cancels out by canceling the transmitted radio wave. If the canceller can suppress the interfering wave by 40 dB, for example, even if the attenuation due to the transmission / reception antenna separation distance, the antenna gain and the total attenuation of the distributor and the cable are taken into consideration, the interfering wave can be sufficiently suppressed by 80 dB. It is possible to give the above attenuation.

However, in the conventional method shown in FIG.
A set of cancellers is required to cancel one interference wave between a pair of transceivers. For example, if the number of channels is N, one set of cancellers is required to remove the interference wave from the transmitter of each channel. Therefore, N2 sets of cancellers are required. Therefore, there is a drawback that the equipment cost becomes expensive because the configuration becomes complicated according to the number of transceivers, and as described above, it is extremely adopted in the car telephone system or MCA having a large number of channels. It was difficult.

Further, as a situation where such a problem occurs, it is conceivable that a large number of radio equipments have to be arranged in a limited area such as a ship or other ships,
A method and apparatus for easily and effectively solving the interference problem between a plurality of radio equipments arranged close to each other has been desired.

In order to solve this problem, the applicant of the present application has already proposed various novel means including the method and apparatus shown below. Explaining one of them, FIG. 3 is a block diagram showing an embodiment of a novel interference wave removing device proposed by the same applicant.

In this embodiment, a plurality of transmitters 14 (14
-1 to 14-n) are combined by a transmitter output combiner 13 and guided to a high frequency power amplifier 12 via one transmission cable 11 and amplified to a desired power and then transmitted to one transmission antenna 1. And radiate it into the space, or omit the power amplifier and supply directly to the antenna. On the other hand, on the receiving device side, in the wireless equipment connected to the receiving antenna 5 and connected to a plurality of 17 receivers via the receiving cable 15 and the distributor 16, the transmitting coaxial cable is connected. The interfering wave is removed all at once by connecting the cable 11 and the receiving cable 15 with an interfering wave canceling device. According to this method, since both transmitting and receiving are connected to the antenna by one cable, there is an advantage that only one cancel device is required.

FIG. 4 is a block diagram showing a concrete example of the configuration of the above-mentioned interfering wave cancel device. 1 is a transmitting antenna, 11 is a transmitting cable for connecting the transmitting antenna and a linear amplifier power amplifier. -Bulb, and 5 and 15 are receiving antennas and receiving cables connected thereto.
In this embodiment, a part of the transmission signal is branched by the directional coupler 21 inserted in the transmission cable 11, and this is divided into a coaxial cable 22, a voltage variable phase shifter 23 and a voltage variable attenuator 24. And a directional coupler 25 connected to a receiving cable 15 between the receiving antenna 5 and the receiver.

Further, the output of the directional coupler 25 is transmitted to a reception distributor (not shown), and a part of the output is also supplied to the monitor receiver 26. The monitor receiver 26 outputs a reception level as will be described later. A signal that can be monitored is output, and the signal is supplied to a control microcomputer 28 through an analog / digital converter (A / D) 27. The voltages from the two voltage setting devices 29 and 30 are input to the microcomputer 28 via the analog / digital converters 31 and 32, and at the same time, the digital signal obtained as a result of the arithmetic processing is Digital-analog converter 33, 34
Through the variable voltage phase shifter 23 and the variable voltage attenuator 24.
Is configured to supply. The microcomputer 28 may be provided with an automatic control and a manual switching means so that fine adjustment or coarse adjustment and fine adjustment can be effectively performed.

The operation and control method of the above configuration will be briefly described. Now, when all or some of the plurality of transmitters 14 are activated and radiated as a transmission radio wave from the transmission antenna 1 through the transmitter output synthesizer 13, the power amplifier 12, and the transmission cable 11, the Of course, a part of it is input to the receiving antenna 5 placed at a close range,
It is mixed in the receiver 17 connected via the distributor 16.

Therefore, the transmission signal component A (F1, F2, ..., Fn) is branched by the directional coupler 21, the phase of the signal is controlled by the voltage variable phase shifter 23, and then the voltage is varied. After the amplitude level is adjusted by the attenuator 24, it is supplied to the receiving side directional coupler 25 at the next stage. on the other hand,
To the directional coupler 25, the transmission radio waves B (F1, F2, ..., Fn) are transmitted through the receiving antenna 5 as described above.
Has been entered. Therefore, in the directional coupler 25, the voltage variable phase shifter 23 and the voltage variable attenuator 2 are arranged so that the signals A and B of the both are canceled and canceled by each other.
4 and control.

As a result, the transmission wave component in the signal output from the reception side directional coupler 25 is removed or the level is remarkably attenuated, so that the level becomes less than a predetermined value. For example, the S / N deterioration of the demodulated signal of the receiver is prevented. In this method, in order to cancel and remove the interfering wave, it is important to accurately adjust the level and phase relationship between the interfering waves. Therefore, an example of a case where the adjustment is automatically performed will be described.

The block 35 in FIG. 4 is an automatic adjustment circuit, which is composed of the monitor receiver 26, the control computer 28 and peripheral blocks thereof, and is controlled as follows. That is, in general, the desired wave signal level received and demodulated by the receiver is larger than several dBμ,
Although it is several tens of dBμ at most, the level of the interfering wave mixed from the transmitters arranged close to each other is often extremely large, for example, about 100 dBμ or more. Therefore, if the monitor receiver 26 receives an interfering wave existing in the central frequency band of the interfering wave group, even if the desired wave is included in the interfering wave, its level can be ignored. Therefore, in order to minimize the signal level received by the monitor receiver,
The voltage variable phase shifter 23 and the voltage variable attenuator 24 may be controlled.

The monitor receiver 26 receives one of the interfering wave frequencies from the above-mentioned transmitter and obtains an output capable of monitoring the level of the interfering wave such as its carrier level or noise suppression level. This information is converted into a digital signal by the analog / digital converter 27, and the control computer 28 adjusts the variable attenuator 24 and the variable phase shifter 23 so that the level thereof is minimized.

In order to detect the minimum interference wave level, for example, the output voltage level (obtained by rectifying the signal extracted from the intermediate frequency amplification stage) of the monitor receiver 26 may be monitored. The interference wave may be received as the desired wave of the monitor receiver. It should be noted that the output voltage level is changed linearly on a logarithmic scale in a relatively wide range of the received electric field strength, and when the received electric field strength becomes larger, the output voltage level is saturated at a constant voltage.

Due to this characteristic, when the voltage variable phase shifter 23 and the electric variable attenuator 24 are adjusted, it is possible to make an accurate adjustment according to a wide electric field strength level range. If the level difference between the disturbing wave and the desired wave is 80 dB or less, no harmful wave is received. For example, if the disturbing wave is 120 dB larger than the desired wave,
If you attenuate this by 40 dB, you can achieve the purpose.
It is not necessary to completely remove the interfering wave.

That is, when the above-mentioned MCA system, car telephone system, or radio system equipment such as a pager is closely arranged, consideration should be given so that the transmission wave does not become an interference wave of the reception channel in each independent system. However, between different systems, one transmission channel signal may become an interference wave of the other reception channel.

In this case, since the interfering wave channel group and the receiving channel group often have a slightly different frequency arrangement, the interfering wave removing device captures the central channel frequency of the interfering wave channel group, By canceling it, it is possible to remove the interfering waves in a relatively wide range centered on the channel.

FIG. 5 shows one disturbance wave frequency fc of 400
When the frequency is set to MHz and the variable voltage phase shifter and the attenuator are adjusted to obtain an attenuation amount of 60 dB with respect to the signal of the frequency fc, the attenuation amount deteriorates to 40 decibels. The interval between the high and low frequencies f1 and f2. Was about 0.4 MHz. This is because the interfering wave frequency is adjusted as f
The phase (frequency) deviates from the ideal state as it deviates from c, which means that the removal capability decreases.

In this measurement, the signal output from the standard signal generator as an interfering wave is branched into two, one of which is directly connected to the directional coupler through the above-mentioned voltage variable phase shifter and voltage variable attenuator, and the other is directly connected. It is the result of measuring the amount of attenuation when the signal frequency from the signal generator is changed in a state where the automatic cancellation control block 35 of FIG. 4 described above is operated while being input to the directional coupler. That is, it is a characteristic when a single frequency signal is input as an interfering wave and the frequency is changed, and can be called static characteristic.

However, in the same apparatus, three signal generators are prepared, one is fixed at the frequency fc, and the output signal frequencies f1 and f2 of the other two signal generators are fc.
When it is changed on both the high and low sides, the measurement result as shown in FIG. 6 is obtained. That is, in this case, even if the interval between f1 and f2 is 1 MHz, it is only a few dB from the attenuation amount at f1.
It was found that the interference wave removal capability was obtained in a wide frequency range with only a slight deterioration. The characteristics in this state can be called dynamic characteristics as compared with the example of FIG. 5, and show the interference wave removing capability of this device in an actual radio operating state.

Therefore, if the canceling frequency of the above-mentioned interference wave removing device is adjusted to a frequency approximately at the center of the interference wave frequency group, it is possible to suppress the interference wave in a required range on both sides of high and low over a wide range.

FIG. 7 is a diagram showing the residual amount of interference wave measured when the device shown in the above-described embodiment of the present invention is operated in a situation where a plurality of interference waves of about 120 dBμ actually exist. The frequency is 60 dBμ, and it is 7 at the frequency ± 0.5 MHz on both sides.
The residual amount was about 0 dBμ. Therefore, in a normal receiver, a demodulated signal of sufficiently high quality can be obtained unless the desired wave has the same frequency as the interfering wave.

In adjusting the voltage variable phase shifter and the voltage variable attenuator, immediately after the interference wave removing device is turned on, the cancel frequency does not match the interference wave, and the automatic adjustment block It may take a relatively long time to match this frequency. Therefore, as in this embodiment, automatic and manual switching means are added to the control microcomputer, and the voltage variable phase shifter and the attenuator are roughly adjusted by manual operation at the start-up of the device,
By switching to automatic adjustment and performing fine adjustment and automatic tracking adjustment, quick control is possible.

However, in the above-mentioned interference wave removing device, there is no problem when the interference wave to be captured by the monitor receiver is constantly transmitted, but when the transmission of the interference wave being monitored is stopped, the monitor receiver If the channel is fixed, the cancel operation becomes impossible because the signals for adjusting the voltage variable phase shifter and the voltage variable attenuator are interrupted. As a countermeasure for this, there is a method of fixing the phase shifter and attenuator of the interference wave cancel device to the state just before the interruption wave is interrupted, but if it takes a long time, the adjustment deviates from the ideal state and the cancellation effect is reduced. May occur.

In another situation, when the interfering wave channel and the receiving channel coexist in a state of interrupting each other, it is more effective to capture and cancel the interfering wave closest to the actually received channel. Therefore, in actual operation, according to the number of interference channels and reception channels and the frequency relationship, the optimum interference is selectively captured,
Performing the cancel operation is effective in improving the function of the interference wave removing device.

[0031]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is applied to an interference wave canceling apparatus and method proposed by the same applicant, including a conventional interference wave canceling apparatus. Therefore, even if the disturbance wave being monitored is interrupted, it is intended to provide a means capable of continuously maintaining the disturbance wave removal function by automatically capturing another disturbance wave. There is.

[0032]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a disturbance that intermixes from one transmitter of at least one set of closely arranged radio communication devices to the other receiver through space. Means for removing a wave on the receiver side, the level of the interfering wave input to the receiver being monitored by a monitor receiver, and the interfering wave removing means so that the level becomes a minimum or a predetermined value or less. In the interference wave canceller equipped with means for automatically adjusting the key points of, when no interference wave is detected in the reception channel, or when necessary, the reception channel frequency of the monitor receiver is scanned within a predetermined range. , It is configured to automatically control the channel in which the interference wave is captured.

Further, even after the interfering wave is once captured,
The frequency of the monitor receiver is scanned to capture a channel interference wave close to the reception frequency of the wireless communication device or close to the center of the interference wave channel group to be canceled.

[0034]

The present invention will be described in detail below with reference to the illustrated embodiments. FIG. 1 is a schematic configuration diagram showing an embodiment of radio equipment when the present invention is applied to the interference wave removing apparatus shown in FIGS. 2 and 3, and the same symbols as those in FIGS. 2 and 3 are the same apparatuses. Is shown.

In the figure, 1 is a transmitting antenna,
It is connected to the transmitter group T via the directional coupler 21, and at the same time, the other output end of the directional coupler 21 is connected to the voltage variable phase shifter 23 via the coaxial cable 22 and its output is connected. The voltage is supplied to the receiver group via the voltage variable attenuator 24, the second directional coupler 25, and the distributor (not shown). Further, a part of the output of the second directional coupler 25 is supplied to the interfering wave monitor receiver 100 via the changeover switch SW.

The output signal of the interfering wave monitor receiver 100 is guided to the control microcomputer 28 via the A / D converter 106, and the voltage is adjusted so as to minimize the interfering wave level as described above. The variable phase shifter 23 and the voltage variable attenuator 24 are controlled to cancel the interference wave.

The interference wave monitor receiver 100 is constructed and controlled as follows. That is, the switch SW
The signal guided to the high-frequency amplifier 101 via is mixed with a local signal fL from a voltage-controlled oscillator VCO described later in a mixer 102, becomes an intermediate frequency, and passes through a bandpass filter 103. Logarithmic amplifier 1
It is input to 04. The output of the logarithmic amplifier 104 is converted into a direct current by the wave detector 105, and is passed through the analog / digital converter 106 to the control microcomputer 28.
Is supplied to.

On the other hand, the phase lock loop circuit (PLL) circuit for generating the local signal fL has a voltage controlled oscillator VCO, a loop filter L · FIL, a phase shift detector PD, and a variable phase shift detector PD. The frequency divider and the frequency divider are connected in a loop, and the phase shift detector PD is configured to be supplied with the output of the reference oscillator SSG.
The variable frequency divider is controlled by the control of 8.

The attenuator ATT107 inserted between the receiver side directional coupler 25 and the switch SW sets the interference wave level to a required level so that the monitor receiver is not saturated when the interference wave level is large. It is for supplying to the monitor receiver after reduction, and when the cancel effect is obtained, the switch SW is operated to bypass the attenuator.

The characteristic feature of this embodiment is that the interfering wave channel frequency to be monitored by the interfering wave monitor receiver 100 is scanned if necessary as described below, and the above-mentioned is based on the newly captured interfering wave. Controlling the variable voltage phase shifter 23 and the variable voltage attenuator 24.

First, a basic control mode will be described. When the transmission of the interfering wave is stopped while the interfering wave in the center of the interfering wave channel group is being monitored, the interfering wave cancel control becomes impossible as already described. Therefore, when it is detected that the interfering wave being monitored is disrupted, the variable frequency divider D of the PLL circuit is changed to change the frequency to be supplied to the mixer 102 from the VCO for monitoring. Scan the jammer channels sequentially. As a result, when there is another interfering wave, a new interfering wave is captured, and the voltage variable phase shifter 23 and the voltage variable attenuator 24 described above are adjusted so that the reception component of the channel is minimized.

At this time, the interruption of the interfering wave being monitored can be detected by the extreme decrease in the output level of the monitor receiver, but if necessary, the monitor receiver and the receiving channel are linked. It is also effective to monitor the output of the directional coupler 21 on the transmitter side or the input signal level of the directional coupler 25 on the receiver side by another monitor receiver for scanning.

Various methods are also conceivable as a method for capturing a monitor interference wave when there are a plurality of interference waves. That is, when the interfering wave being monitored is interrupted, an example in which the interfering wave detected first during the scan is captured and the cancellation control is performed thereafter, and a predetermined frequency range is scanned, the number of interfering waves and their frequencies ( Channel) and select the interfering wave closest to the center of the frequency range where the effect of canceling the interfering wave is expected, and perform the following cancellation control, or the interfering wave closest to the receiving channel. Examples include a method of selectively capturing.

The first method described above is simple in device configuration and control, and the second method is complicated in device and control.
This is very effective in suppressing and controlling a plurality of interfering waves in which the receiving channel group and the interfering wave channel group are slightly separated. Furthermore, the third method is effective in removing interference with the channel that is actually being received in the state where a plurality of interference wave channels are mixed in the reception channel group.

As described above, if the frequency of the monitor receiver in the interfering wave removing device is configured to scan as needed, the above-mentioned conventional problems can be solved all at once. Such means is not limited to the interference wave removing device shown in FIG. 1, but is widely applicable to other types of interference wave removing devices.

[0046]

As described above, according to the present invention, the channel of the monitor receiver in the interfering wave removing device can be changed and the channel is scanned as needed, so that the interfering wave being captured is interrupted. Even in such a case, it is possible to automatically capture another interference wave and continuously maintain the interference wave removing function. Furthermore, when a plurality of interfering waves are mixed in the reception channel, it is possible to selectively supplement the interfering wave that has the highest influence on the actually receiving channel and remove the interfering wave.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an interference wave removing device according to the present invention.

FIG. 2 is a block diagram showing a conventional interference wave removing device.

FIG. 3 is a block diagram showing an embodiment of an interference wave removing device filed by the same applicant.

FIG. 4 is a block diagram showing a specific configuration example of an embodiment of an interference wave removing device filed by the same applicant.

FIG. 5 is an attenuation characteristic diagram for explaining the operation of the interference wave removing device filed by the same applicant.

FIG. 6 is an attenuation characteristic diagram for explaining the operation of the interference wave removing device filed by the same applicant.

FIG. 7 is an interference wave removal characteristic diagram for explaining the operation of the interference wave removal device applied for by the same applicant.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 transmitting antenna 2, 13 combiner 3, 11 transmitting cable 4, 14-1, 14-2, ..., 14-n transmitter 5, 210 receiving antenna 6, 16 distributor 7-1, 7- 2, 7 ..., 7-n, 15, 211 reception cables 8-1, 8-2, ... 8-n, 17-1, 17-2 ,.
17-i receiver 9-1, 9-2, ... 9-n, 18 canceller 12 high frequency power amplifier 21, 25 directional coupler 22 coaxial cable 23 variable phase shifter 24 variable attenuator 26, 100 monitor receiver 27, 31, 32, 106 analog-digital converter 28 control computer 29, 30 voltage setting device 33, 34 digital-analog converter 35 automatic adjustment block 101 high-frequency amplifier 102 mixer 103 band-pass filter 104 logarithmic amplifier 105 detector

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Susumu Nakabayashi 39-10 Kitaminecho, Ota-ku, Tokyo Fujitec Stock Company (72) Inventor Fujio Kaku 39-10 Kitaminecho, Ota-ku, Tokyo Fujitec Stock Ceremony In the company

Claims (2)

[Claims] 1. A means for removing, on the receiver side, an interfering wave mixed from one transmitter of another wireless communication device arranged in proximity to the other receiver through space, and the interference is input to the receiver. In a jamming wave removing apparatus having means for monitoring the wave level with a monitor receiver and adjusting a required part of the jamming wave removing means so that the level becomes a minimum value or a predetermined value or less, a channel being received by the monitor When no interfering wave is detected, or if necessary, the receiving channel frequency of the monitor receiver is scanned, and the required part of the interfering wave removing device is automatically controlled in the channel in which the interfering wave is captured. An interfering wave removing device for a wireless communication device. 2. A means for removing, on the receiver side, an interfering wave that mixes from one transmitter of another wireless communication device placed in proximity to the other receiver via space, and is an interference input to the receiver. In a jamming wave removing apparatus having means for monitoring the wave level with a monitor receiver and adjusting a required part of the jamming wave removing means so that the level becomes a minimum value or a predetermined value or less, a channel being received by the monitor When no interfering wave is detected, or when necessary, a means for scanning the receiving channel frequency of the monitor receiver within a predetermined range and a necessary part of the interfering wave removing device at the frequency at which the interfering wave is captured are automatically operated. Means for controlling, means for obtaining channel information being received from the receiver of the wireless transmission device, and means for determining an interference wave frequency to be canceled based on the received information. An interfering wave removing device for a wireless communication device, comprising: