JP2019068160A - Signal transceiver, transmitter, receiver, control method of signal transceiver, and program - Google Patents

Abstract

To stably carry data even under an environment in which disturbing waves are in a wide band.SOLUTION: A differential modulation unit (410) differentially modulates main data included in input data. A multicarrier generation unit (430) modulates a multicarrier signal with the main data, an AC signal, or a pilot signal. If there is a possibility that disturbing waves may be overlapped with a carrier wave modulated with the main data, the multicarrier generation unit (430) replaces the carrier wave with a carrier wave modulated with the AC signal or pilot signal. A disturbing wave removing unit (44) removes the disturbing waves from the multicarrier signal.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a signal transmission / reception device, a transmitter, a receiver, a control method of the signal transmission / reception device, and a program, and, for example, to a signal transmission / reception device that modulates a signal by multicarrier modulation.

  The OFDM (Orthogonal Frequency Division Multiplexing) scheme is a type of multi-carrier modulation scheme (Patent Document 1). In the OFDM scheme, data is distributed to a plurality of carriers having different center frequencies. Therefore, the OFDM scheme is resistant to noise caused by multipath and has an advantage that data can be stably transported. The OFDM scheme is employed, for example, in terrestrial digital broadcasting, wireless LAN (Local Access Network), and power line carrier communication.

  FIG. 10 is a diagram showing an example of a multicarrier signal (hereinafter referred to as an OFDM signal). As shown in FIG. 10, the OFDM signal includes a plurality of carriers in parallel on the frequency axis. A plurality of carriers included in the OFDM signal respectively carry main data, AC (Auxiliary Channel) signals, and pilot signals. In OFDM signals, some of the multiple carriers overlap. However, since the plurality of carriers are orthogonal to each other, they do not interfere.

  As shown in FIG. 10, when a disturbance wave intrudes into a carrier (data carrier) carrying main data, the C / N (Channel Signal to Noise ratio) of the data carrier drops. Therefore, in the standard related to the digital signal transmission system of the OFDM system, when an interference wave intrudes into a data carrier, it is prescribed to replace the data carrier with a carrier that carries an AC signal (Non-Patent Document 1). .

JP, 2009-232050, A

Portable OFDM Digital Signal Transmission System Standard for ARIB STD-B57 for 1.2 GHz / 2.3 GHz Band Television Broadcasting Program Transmission Standard Japan Radio Industry Association (July 6, 2016)

  However, the number of carriers (AC signal carriers) carrying AC signals is not very large. For example, in FULL-2K broadcasting, there are 1344 data carriers, while there are 144 AC signal carriers.

  Therefore, when the bandwidth of the disturbance is wide, it may not be possible to replace all data carriers affected by the disturbance with the AC signal carrier. As a result, the C / N of the data carrier may be lowered, and data may not be stably transported.

  An object of the present invention is to stably transport data even in an environment where there is an interference wave in a wide band.

  A signal transmitting / receiving apparatus according to an aspect of the present invention is a differential modulation means for mapping main data to I / Q signals and performing phase modulation, and I / Q mapping for mapping AC signals and pilot signals to I / Q signals. Means, multicarrier generation means for modulating a plurality of carriers included in a multicarrier signal with the main data, the AC signal, or the pilot signal, and an interference wave for removing an interference wave from the multicarrier signal The multicarrier generation means is modulated by the main data in the multicarrier signal when there is a possibility that the interference wave is superimposed on the carrier wave modulated by the main data. The carrier and the carrier modulated by the AC signal or the pilot signal are interchanged.

  A transmitter according to one aspect of the present invention comprises the differential modulation means, the multicarrier generation means, an IFFT transformation means for performing inverse Fourier transform of the multicarrier signal from the frequency domain to the time domain, and the time domain And a transmission antenna for transmitting a multicarrier signal.

  A receiver according to one aspect of the present invention is a receiving antenna for receiving the multicarrier signal in the time domain, the interference wave removing means, and an FFT transforming means for Fourier transforming the multicarrier signal from the time domain to the frequency domain And differential demodulation means for differentially demodulating the carrier of the multicarrier signal.

  A control method of a signal transmission / reception device according to an aspect of the present invention maps main data to an I / Q signal and performs phase modulation, maps an AC signal and a pilot signal to an I / Q signal, and includes in a multicarrier signal. A control method of a signal transmitting and receiving apparatus, wherein a plurality of carrier waves are respectively modulated by the main data, the AC signal, or the pilot signal, and an interference wave is removed from the multicarrier signal, the main data When there is a possibility that the disturbance wave is superimposed on the modulated carrier, in the multicarrier signal, the carrier modulated by the main data and the carrier modulated by the AC signal or the pilot signal are interchanged. .

  A program according to one aspect of the present invention includes mapping of main data to I / Q signals and phase modulation, mapping of AC signals and pilot signals to I / Q signals, and multi-carrier signals. A program that causes a computer to modulate a plurality of carrier waves with the main data, the AC signal, or the pilot signal, and removing an interference wave from the multicarrier signal, respectively. The program is configured such that, in the multicarrier signal, the carrier wave modulated by the main data and the AC signal or the pilot signal when the interference wave may be superimposed on the carrier wave modulated by the main data. Have the computer implement swapping with the modulated carrier.

  According to the present invention, data can be stably transported even in an environment where there is an interference wave in a wide band.

It is a block diagram which shows the structure of the signal transmission / reception system concerning Embodiment 1-2. It is a block diagram which shows the structure of the transmitter with which the signal transmission / reception system concerning Embodiment 1-2 was equipped. It is a flowchart which shows the operation | movement flow of the transmitter with which the signal-transmission / reception system concerning Embodiment 1-2 was equipped. It is a block diagram which shows the structure of the receiver with which the signal transmission / reception system concerning Embodiment 1-2 was equipped. It is a flowchart which shows the operation | movement flow of the receiver with which the signal-transmission / reception system concerning Embodiment 1-2 was equipped. It is a figure which shows the structure of the consonant wave removal part with which the receiver concerning Embodiment 1-2 was equipped. It is a figure which shows a mode that the interference wave penetrated into the carrier (data carrier) which conveys main data in an OFDM (Orthogonal Frequency Division Multiplexing) signal. FIG. 8 is a block diagram showing the configuration of a wireless transmission / reception device according to Embodiment 3. FIG. 16 is a diagram illustrating a hardware configuration of a wireless reception device according to a fourth embodiment. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 illustrates the problems of the related prior art.

Embodiment 1
The configuration according to the first embodiment will be described below with reference to FIGS. 1 to 7.

(Signal transmission / reception system 100)
FIG. 1 is a diagram schematically showing the configuration of a signal transmission / reception system 100 according to the first embodiment. As shown in FIG. 1, the signal transmission / reception system 100 includes a transmitter 200 and a receiver 300.

  The transmitter 200 and the receiver 300 perform wireless communication by orthogonal frequency division multiplexing (OFDM). The OFDM scheme is also called orthogonal wave frequency division multiplexing scheme. In the OFDM scheme, signals carried on a large number of carriers are carried. These carriers are orthogonal to one another. That is, at the center frequency at which the signal strength of one carrier is strongest, the signal strengths of other carriers are zero. Therefore, carriers are allowed to overlap on the frequency axis.

(Transmitter 200)
The configuration of the transmitter 200 according to the first embodiment will be described with reference to FIG. As shown in FIG. 2, the transmitter 200 includes an encoder 1, a differential modulator 2, an AC mapping unit 3, a pilot mapping unit 4, an OFDM framer 5 (multicarrier generation means), and an IFFT (inverse fast Fourier transform). A & GI (Guard Interval) unit 6, a D (Digital) / A (Analog) unit 7, an upconverter 8a, a power amplification unit 8b, and a transmission antenna 210 are provided.

  The transmitter 200 receives input data from the outside. Input data includes main data and AC signals (see FIG. 1). The input data is a digital signal.

  Next, an operation flow of the transmitter 200 will be described. The operation of each component of the transmitter 200 will be described along with the description of the following operation flow.

  FIG. 3 is a flow chart schematically showing the flow of operation of the transmitter 200. As shown in FIG.

  The encoding unit 1 performs error correction coding on main data included in input data. The encoding unit 1 outputs the encoded main data to the differential modulation unit 2.

  As shown in FIG. 3, the differential modulation unit 2 differentially modulates the in-phase component and the quadrature-phase component of the I / Q signal according to the main data (S1). In other words, the differential modulation unit 2 maps the encoded main data to a symbol (referred to as an I / Q signal) on I (Quadrature) / Q (In-phase) coordinates, and then the I / Q. The phase of the signal is shifted (phase modulation) and output.

  The AC mapping unit 3 maps an AC signal to an I / Q signal. The pilot mapping unit 4 generates a pilot signal and maps the generated pilot signal to an I / Q signal.

  The OFDM framer 5 generates an OFDM signal. Specifically, the OFDM framer 5 allocates the main data, the AC signal, and the I / Q signal mapped from the pilot signal to carriers included in the OFDM signal (S2).

  Hereinafter, carriers to which main data are assigned will be referred to as data carriers. A carrier assigned an AC signal is called an AC signal carrier. A carrier assigned a pilot signal is called a pilot signal carrier. In other words, the data carrier is a carrier wave modulated by the main data. The OA carrier is a carrier wave modulated by the OA signal. The pilot signal carrier is a carrier wave modulated by the pilot signal.

  Subsequently, the OFDM framer 5 interchanges the data carrier and the AC signal carrier and / or the pilot signal carrier in the OFDM signal based on the carrier replacement information (S3). Here, the carrier replacement information is information for identifying a data carrier that may be affected by the disturbance wave. The carrier replacement information is set by the user. The user searches for a data carrier affected by the disturbance by checking whether the interference is mixed in the OFDM signal. Then, when the user finds a data carrier affected by the disturbance wave, the user inputs to the transmitter 200 carrier replacement information for replacing the data carrier with an AC signal carrier. The OFDM framer 5 replaces the data carrier affected by the interference wave with the AC signal carrier based on the set carrier replacement information.

  Alternatively, the OFDM framer 5 more generally interchanges the data carrier with the AC signal carrier and / or the pilot signal carrier in the OFDM signal when there is a possibility that the interference wave is superimposed on the data carrier. The method of exchanging the data carrier with the AC signal carrier and / or the pilot signal carrier is not limited.

  Thereafter, the IFFT & GI addition unit 6 converts the OFDM signal in the frequency domain into an OFDM signal in the time domain by performing an inverse fast Fourier transform (IFFT) (S5). The IFFT & GI addition unit 6 adds a GI (Guard Interval) to the inverse fast Fourier transformed OFDM signal.

  The D / A converter 7 D / A converts the inverse fast Fourier transformed OFDM signal (hereinafter referred to as an analog OFDM signal) (S4). Thereafter, the A / D conversion unit 7 outputs the analog OFDM signal to the up converter 8a.

  The upconverter 8a upconverts (increases) the frequency (original frequency) of the analog OFDM signal to the transmission frequency. The power amplification unit 8b amplifies the intensity of the upconverted analog OFDM signal to a predetermined level. The upconverter 8a and the power amplification unit 8b have a role of improving the reception quality of the analog OFDM signal by the reception antenna 310.

  The power amplification unit 8 b outputs the amplified analog OFDM signal from the transmission antenna 210 (see FIG. 1).

  Thus, the operation of the transmitter 200 ends.

(Modification 1 of Transmitter 200)
In one variation, the OFDM framer 5 may prioritize pilot signal carriers over AC signal carriers and replace them with data carriers affected by jamming. Also, if the bandwidth of the jamming wave is relatively narrow and the number of data carriers affected by the jamming wave is smaller than the number of pilot signal carriers, the OFDM framer 5 may also generate an AC signal carrier affected by the jamming wave, The pilot signal carrier may be replaced.

  According to the configuration of the present modification, the influence of the disturbance wave on the AC signal carrier can also be suppressed.

(Receiver 300)
The configuration of the receiver 300 according to the first embodiment will be described with reference to FIG. As shown in FIG. 4, the receiver 300 includes a down converter 9, an AGC (Automatic Gain Control) unit 10, an A / D conversion unit 11, an interference wave removal unit 12, an FFT unit 13, an OFDM deframer 14, and a differential demodulation unit. 15, a decoding unit 16, an AC demapping unit 17, and a receiving antenna 310. The receiver 300 receives the analog OFDM signal output from the transmit antenna 210 using the receive antenna 310.

  Next, an operation flow of the receiver 300 will be described. The operation of each component of the receiver 300 will be described along with the description of the following operation flow.

  FIG. 5 is a flow chart schematically showing the flow of the operation of the receiver 300. The downconverter 9 downconverts (decreases) the frequency of the analog OFDM signal received from the transmitter 200 to the frequency (that is, the original frequency) before the upconverter 8a of the transmitter 200 upconverts.

  The AGC unit 10 adjusts the gain (sensitivity) of the receiving antenna 310 (see FIG. 1) so that the intensity of the downconverted analog OFDM signal becomes a constant level. Thereafter, the AGC unit 10 outputs the analog OFDM signal to the A / D conversion unit 11.

  As shown in FIG. 5, the A / D converter 11 A / D converts an analog OFDM signal (S11).

  The interference wave removal unit 12 removes interference waves from the OFDM signal (digital OFDM signal) digitized by the A / D conversion unit 11 (filtering) (S12). Details of the filtering process by the interference wave removing unit 12 will be described later (see FIG. 6).

  Next, the FFT unit 13 converts the time-domain digital OFDM signal into a frequency-domain digital OFDM signal by fast Fourier transform (FFT) (S13). The FFT unit 13 outputs the digital OFDM signal in the frequency domain to the OFDM deframer 14.

  The OFDM deframer 14 is a digital OFDM signal (data-OFDM signal) mapped from the main data by the differential modulation unit 2 from the digital OFDM signal in the frequency domain and a digital OFDM signal mapped from the AC signal by the AC mapping unit 3 (AC-OFDM signal) is separated.

  The OFDM deframer 14 outputs the data-OFDM signal to the differential demodulator 15 and outputs the AC-OFDM signal to the AC demapping unit 17.

  The differential demodulation unit 15 demodulates the main data by demapping the data-OFDM signal (S15). The differential demodulation unit 15 outputs the demodulated main data to the decoding unit 16.

  The AC demapping unit 17 demodulates the AC signal by demapping the AC-OFDM signal. The decoding unit 16 decodes the main data demodulated by the differential demodulation unit 15.

  Above, operation | movement of the receiver 300 is complete | finished.

(Disturber removal unit 12)
The detailed configuration of the disturbance wave removal unit 12 will be described with reference to FIGS. 6 and 7. FIG. 6 is a block diagram showing the configuration of the interference wave removal unit 12. FIG. 7 is a diagram showing an example of an OFDM signal in which an interference wave is superimposed on a data carrier.

  As shown in FIG. 6, the interference wave removal unit 12 includes an FFT unit 121, an interference wave detection unit 122, a frequency shift unit 123, a notch filter 124, and a frequency restorer unit 125.

  The FFT unit 121 performs fast Fourier transform on the digital OFDM signal input from the A / D conversion unit 11 to change the digital OFDM signal from the time domain to the frequency domain.

  The interference wave detection unit 122 detects the frequency of the interference wave. Specifically, the interference detection unit 122 calculates the average value of the levels of the digital OFDM signal at all frequencies. If there is a signal of a level higher than the average value calculated by the interference wave detection unit 122 in the digital OFDM signal, the interference wave detection unit 122 determines that the signal contains an interference wave. It determines and detects the frequency of the said signal as a frequency of an interference wave.

  The interference wave detection unit 122 transmits information indicating the detected frequency of the interference wave to the frequency shift unit 123 and the decoding unit 16 (see FIG. 4) in the subsequent stage. The decoding unit 16 discards the carrier (AC signal carrier and / or pilot signal carrier) on which the interference wave is superimposed without demodulation.

  The frequency shift unit 123 shifts the digital OFDM signal in the frequency axis direction so that the frequency of the interference wave matches the notch frequency (reject center frequency) of the notch filter 124 based on the information indicating the frequency of the interference wave.

  The notch filter 124 removes an interference wave from the digital OFDM signal shifted in the frequency axis direction by the frequency shift unit 123.

  The frequency restorer 125 restores the digital OFDM signal to the original state, that is, the state before the frequency shifter 123 shifts in the frequency axis direction. Thereafter, the frequency restorer 125 transmits the digital OFDM signal from which the disturbance wave has been removed to the FFT unit 13 (see FIG. 4) at the subsequent stage.

(Effect of interference wave removal unit 12)
As described above, the interference wave removal unit 12 can remove interference waves from the digital OFDM signal. When the frequency of the disturbance changes, the interference removal unit 12 causes the notch frequency to follow the frequency of the interference in the digital OFDM signal instead of changing the coefficient of the notch filter 124. Therefore, the disturbance wave removal unit 12 also has an advantage of being easy to mount in the receiver 300.

(Effect of Embodiment 1)
According to the configuration of the first embodiment, when the disturbance wave is superimposed on the data carrier (the carrier carrying the main data), the data carrier is an AC signal carrier (the carrier carrying the AC signal) and / or the pilot Replace with a signal carrier (carrier carrying a pilot signal). This makes it possible to prevent the data carrier from being affected by interference waves.

  Further, in the first embodiment, both an AC signal carrier and a pilot signal carrier can be used to replace data carriers affected by interference waves. Therefore, data can be stably transported even in an environment with interference in a wide band.

  For example, 2K broadcasting (FULL-HD) includes 1344 data carriers, 144 AC signal carriers, and 216 pilot signal carriers. The total number of AC signal carriers and pilot signal carriers is about 2.5 times that of AC signal carriers. Therefore, according to the configuration of the first embodiment, it is possible to cope with an interference wave having a bandwidth of about 2.5 times that of the related configuration in which the data carrier and the AC signal carrier are switched.

Second Embodiment
In the first embodiment, the method of removing interference from the multicarrier signal modulated according to the OFDM scheme has been described. However, the method of removing the interference wave described in the first embodiment can also be applied to methods other than OFDM.

  The configuration of the transmitter according to the second embodiment is the same as the transmitter 200 (see FIG. 2) described in the first embodiment. In the second embodiment, the transmitter 200 uses a multicarrier modulation scheme other than the OFDM scheme, for example, a QAM (Quadrature Amplitude Modulation) scheme or an FM (Frequency Modulation) scheme to input data. Modulate.

  Also in the second embodiment, the OFDM framer 5 of the transmitter 200 transmits an AC signal carrier (AC signal) on a data carrier (carrier carrying main data) on which an interference wave is superimposed, based on the above-described carrier switching information. Replace with the carrier to carry) and / or the pilot signal carrier (carrier carrying the pilot signal). This makes it possible to prevent the data carrier from being affected by interference waves.

(Effect of Embodiment 2)
According to the configuration of the second embodiment, the effects described in the first embodiment are realized also in multicarrier modulation schemes other than the OFDM scheme. That is, the interference wave can be removed from the data carrier (carrier carrying the main data) on which the interference wave is superimposed. Therefore, multi-carrier signals can be stably transported even in an environment where interference waves exist in the same band as the data carrier.

Third Embodiment
In the third embodiment, the minimum configuration of the signal transmitting / receiving apparatus 100 described in the first embodiment will be described.

(Signal transmission / reception device 400)
The configuration of the signal transmitting / receiving apparatus 400 according to the third embodiment will be described with reference to FIG. FIG. 8 is a block diagram showing the configuration of a signal transmission / reception device 400 according to the third embodiment.
As shown in FIG. 8, the signal transmission / reception apparatus 400 includes a differential modulation unit 410, an I / Q mapping unit 420, a multicarrier generation unit 430, and an interference wave removal unit 440.

  The differential modulation unit 410 maps main data included in input data to an I / Q signal and performs phase modulation.

  The I / Q mapping unit 420 maps the AC signal and the pilot signal to the I / Q signal.

  The multicarrier generation unit 430 transmits the plurality of carriers included in the multicarrier signal from the main data from the differential modulation unit 410, the AC signal from the I / Q mapping unit 420, or the I / Q mapping unit 420, respectively. Modulate according to the pilot signal of

  If there is a possibility that the interference wave is superimposed on the carrier wave (data carrier) modulated by the main data, the multicarrier generation unit 430 generates a carrier wave (data carrier) modulated by the main data in the multicarrier signal. Interchange with a carrier (AC signal carrier or pilot signal carrier) modulated by an AC signal or pilot signal.

  The interference wave removal unit 440 discards (removes) the carrier wave including the interference wave from the multicarrier signal.

(Effect of Embodiment 3)
According to the configuration of the third embodiment, when there is a possibility that the interference wave is superimposed on the carrier wave modulated by the main data, the carrier wave and the carrier wave modulated by the AC signal or the pilot signal are interchanged. As a result, the carrier wave modulated by the main data is not affected by the disturbance wave. The carrier wave on which the interference wave is superimposed by being replaced with the carrier wave modulated by the main data, that is, the carrier wave modulated by the AC signal or the pilot signal is discarded by the interference wave removal unit 440 of the receiver.

  Therefore, the main data can be stably transported even in an environment where there is an interference wave in a wide band.

Embodiment 4
The signal transmission / reception device 500 according to the fourth embodiment is realized as a computer device including a CPU (central processing unit) and a memory. Alternatively, control functions of the transmitter 200 and the receiver 300 of the signal transmission / reception device 500 may be realized by an electronic circuit and a machine. In this case, the transmitter 200 and the receiver 300 are hardware devices.

  FIG. 9 shows an example of the hardware configuration of the signal transmission / reception device 500. As shown in FIG. 9, the signal transmission / reception device 500 includes a transmitter 200 and a receiver 300. The control functions of the transmitter 200 and the receiver 300 are the same as the control functions described in the first embodiment.

  As shown in FIG. 9, the transmitter 200 includes a CPU 201, a memory 202, a storage device 203, and an input / output device 204. The input / output device 204 includes a transmitting antenna 210 (see FIG. 1).

  For example, as described in the first embodiment, the CPU 201 of the transmitter 200 includes the encoding unit 1, the differential modulation unit 2, the AC mapping unit 3, the pilot mapping unit 4, the OFDM framer 5, the IFFT & GI addition unit 6, and Execute each function of D / A unit 7. The input / output device 204 of the transmitter 200 includes, for example, the upconverter 8a and the power amplification unit 8b described in the first embodiment.

  The CPU 201 corresponds to each part of the signal transmission / reception device 400 according to the third embodiment, that is, the signal transmission / reception device 400 includes the differential modulation unit 410, the I / Q mapping unit 420, the multicarrier generation unit 430, and the interference wave removal unit 440. Each function can also be realized.

  In the transmitter 200 shown in FIG. 9, the CPU 201 reads a program stored in the non-volatile memory. The CPU 201 writes the program read from the non-volatile memory into the memory 202 and executes the instruction. Thus, the CPU 201 realizes the control function (see FIG. 3) of the transmitter 200 described in the first embodiment. The CPU 201 outputs the result of executing the instruction (in this case, an OFDM signal) from the transmitting antenna 210 of the input / output device 204.

  For example, as described in the first embodiment, the CPU 301 of the receiver 300 includes the A / D unit 11, the interference wave removal unit 12, the FFT unit 13, the OFDM deframer 14, the differential demodulation unit 15, the decoding unit 16, and The functions of the AC demapping unit 17 are executed. The input / output device 304 of the receiver 300 includes, for example, the downconverter 9 and the AGC unit 10 described in the first embodiment.

  In the receiver 300 shown in FIG. 9, the receiving antenna 310 of the input / output device 304 receives an OFDM signal from the transmitter 200. The CPU 301 of the receiver 300 writes the program read from the non-volatile memory into the memory 302 and executes the command to realize the control function (see FIG. 5) of the receiver 300 described in the first embodiment.

(Effect of Embodiment 4)
According to the configuration of the fourth embodiment, the configuration of the signal transmission / reception device 100 described in the first embodiment is realized by a computer device or a hardware device. Thereby, as described in the first embodiment, for example, the data carrier can be set to 5 so as not to be affected by the interference wave.

Reference Signs List 2 differential modulation unit 3 AC mapping unit 4 pilot mapping unit 5 OFDM framer 6 IFFT & GI adding unit 13 FFT unit 14 OFDM deframer 15 differential demodulation unit 16 decoding unit 17 AC demapping unit 100 signal transmission / reception system 121 FFT unit 122 interference wave detection Unit 123 Frequency shift unit 124 Notch filter 125 Frequency restore unit 200 Transmitter 210 Transmission antenna 300 Receiver 310 Reception antenna 400 Signal transmission / reception device 410 Differential modulation unit 420 I / Q mapping unit 430 Multicarrier generation unit 440 Disturbance wave removal unit 500 Signal transmitter and receiver

Claims (7)

Differential modulation means for mapping main data to I / Q signals and performing phase modulation;
I / Q mapping means for mapping AC (Auxiliary Channel) signals and pilot signals to I / Q signals;
Multicarrier generation means for modulating a plurality of carriers included in a multicarrier signal with the main data, the AC signal, or the pilot signal, respectively;
An interference wave removing means for removing an interference wave from the multicarrier signal;
When there is a possibility that the disturbance wave is superimposed on the carrier wave modulated by the main data, the multicarrier generation means may be a carrier wave modulated by the main data, the AC signal or the multicarrier signal in the multicarrier signal. A signal transmitting / receiving apparatus characterized by replacing the carrier wave modulated by the pilot signal. The disturbance wave removal means includes interference wave detection means, a notch filter, and frequency shift means.
The interference wave detection means detects the interference wave from the multicarrier signal,
The frequency shifting means causes the center frequency of the interference wave to coincide with the notch frequency of the notch filter by shifting the multicarrier signal in the direction of the frequency axis.
The signal transmitting / receiving apparatus according to claim 1, wherein the notch filter removes a carrier wave having a frequency coincident with the notch frequency from the multicarrier signal. The multicarrier generation means preferentially replaces the carrier wave modulated by the main data and the carrier wave modulated by the pilot signal, and all the carriers modulated by the pilot signal by the main data 3. The signal transmitting / receiving apparatus according to claim 1, wherein the carrier wave modulated by the main data and the carrier wave modulated by the AC signal are switched after being replaced with the modulated carrier wave. A transmitter provided in the signal transmission / reception device according to claim 1, wherein
Said differential modulation means;
The multicarrier generation unit;
IFFT transformation means for inverse Fourier transforming the multicarrier signal from the frequency domain to the time domain;
A transmit antenna for transmitting the multicarrier signal in the time domain;
A transmitter characterized by comprising. A receiver provided in the signal transmission / reception device according to claim 1, wherein
A receiving antenna for receiving the multi-carrier signal in time domain;
The disturbance wave removing means;
FFT transform means for Fourier transforming the multicarrier signal from time domain to frequency domain;
Differential demodulation means for differentially demodulating the carrier of the multicarrier signal;
A receiver characterized in that it comprises. Map the main data to the I / Q signal and phase modulate it,
Map AC and pilot signals to I / Q signals,
A plurality of carriers included in a multicarrier signal are modulated by the main data, the AC signal, or the pilot signal, respectively.
A control method of a signal transmitting and receiving apparatus, which removes an interference wave from the multicarrier signal,
When there is a possibility that the disturbance wave is superimposed on the carrier wave modulated by the main data, the carrier wave modulated by the main data and the AC signal or the pilot signal are modulated in the multicarrier signal. A control method of a signal transmission / reception device characterized by replacing a carrier wave. Mapping the main data to an I / Q signal and phase modulating it;
Mapping AC and pilot signals to I / Q signals;
Modulating the plurality of carriers included in the multicarrier signal with the main data, the AC signal, or the pilot signal, respectively;
A program that causes a computer to execute removing interference from the multicarrier signal,
The program is
When there is a possibility that the disturbance wave is superimposed on the carrier wave modulated by the main data, the carrier wave modulated by the main data and the AC signal or the pilot signal are modulated in the multicarrier signal. A program that causes a computer to replace carrier waves.

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