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WO2017090467A1 - Dispositif et procédé de communication - Google Patents

Dispositif et procédé de communication Download PDF

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Publication number
WO2017090467A1
WO2017090467A1 PCT/JP2016/083554 JP2016083554W WO2017090467A1 WO 2017090467 A1 WO2017090467 A1 WO 2017090467A1 JP 2016083554 W JP2016083554 W JP 2016083554W WO 2017090467 A1 WO2017090467 A1 WO 2017090467A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
modulation
band
communication device
demodulation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2016/083554
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English (en)
Japanese (ja)
Inventor
光彦 北島
智広 糸賀
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kokusai Denki Electric Inc
Original Assignee
Hitachi Kokusai Electric Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Kokusai Electric Inc filed Critical Hitachi Kokusai Electric Inc
Priority to JP2017552363A priority Critical patent/JP6497825B2/ja
Publication of WO2017090467A1 publication Critical patent/WO2017090467A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes

Definitions

  • the present invention relates to a communication device and a communication method.
  • Patent Document 1 discloses an invention for reducing burst data errors caused by switching of a radio modulation frequency in a frequency hopping method.
  • the object of the present invention is to adapt the bandwidth and the power per subcarrier even if two waves of the transmission frequency including the subcarrier are close to each other, reduce mutual interference, and use frequency for anti-interception and anti-jamming.
  • a communication apparatus and a communication method capable of a frequency hopping communication scheme that guarantees that frequencies at the same time do not overlap are provided.
  • the communication device of the present invention is a communication device including a radio unit that performs frequency hopping communication and a modem unit, and the radio unit includes an antenna, a shared unit, a directional coupling unit, a filter unit, an amplifying unit, a combining unit, and a distributing unit.
  • the modulation / demodulation unit includes an OFDM modulation / demodulation unit, an orthogonal modulation unit, an orthogonal demodulation unit, a local transmission unit, and a reference clock generation unit, and a reference clock supplied to the OFDM modulation / demodulation unit and the local transmission unit is generated as a reference clock. It supplies only from a part.
  • the communication method of the present invention is a communication method in a communication device including a radio unit for frequency hopping communication and a modulation / demodulation unit, and the radio unit combines an antenna, a shared unit, a directional coupling unit, a filter unit, and an amplification unit.
  • the modulation / demodulation unit has an OFDM modulation / demodulation unit, an orthogonal modulation unit, an orthogonal demodulation unit, a local transmission unit, and a reference clock generation unit, and is supplied to the OFDM modulation / demodulation unit and the local transmission unit. Is supplied from a reference clock generator.
  • the communication apparatus of the present invention is the communication apparatus described above, wherein modulation of the OFDM modulation / demodulation unit increases or decreases a band or a sampling frequency.
  • the communication device of the present invention is the communication device described above, wherein the modulation of the OFDM modulation / demodulation unit is characterized in that subcarriers are arranged on both sides centering on the carrier frequency or no carrier wave is located in the band.
  • the communication device of the present invention is the above-described communication device in which the carrier wave is located at the center of the band (actually does not exist but remains due to hardware deterioration), the carrier wave of the quadrature modulation unit is hopped.
  • the baseband signal (IFFT baseband signal) input to the quadrature modulation unit is used when the carrier wave is not located in the band, and subcarriers corresponding to a predetermined bandwidth are used.
  • the communication device of the present invention is the communication device described above, and the carrier wave located within the band is made to have a different frequency in time, and the carrier wave not located within the band is the input signal after IFFT. Frequency hopping is performed by controlling the presence or absence.
  • the bandwidth and the power per subcarrier are adapted, the mutual interference is reduced, and the frequency is used for anti-interception and anti-jamming.
  • the frequency hopping method in which communication is performed with different frequencies, mutual interference is eliminated, so that it is possible to ensure that frequencies at the same time do not overlap.
  • FIG. 1 is a diagram showing a configuration example of a system according to an embodiment of the present invention.
  • transmission / reception stations 101, 102, and 103 are communication devices.
  • the transmission / reception stations 101, 102, and 103 include at least a radio unit 200 and a modem unit 300 or a modem unit 400.
  • the transmission / reception station 101 communicates with the transmission / reception station 102 using the frequency F1, and communicates with the transmission / reception station 103 using the frequency F3.
  • the transmitting / receiving station 102 communicates with the transmitting / receiving station 103 using the frequency F2.
  • the frequencies F1, F2, and F3 are different frequencies. That is, the transmission / reception stations 101, 102, and 103 can simultaneously communicate using two wave frequencies.
  • FIG. 2 is a block diagram of a radio unit according to an embodiment of the present invention.
  • the radio unit 200 includes an amplifying unit 201, a filter unit 202, a directional coupling unit 203, a shared unit 204, an antenna 205, a combining unit 206, and a distributing unit 207.
  • the combining unit 206 and the distributing unit 207 are not included in a normal communication device, but are characteristic functional blocks in an embodiment of the present invention. Therefore, the wireless unit 200 is a normal half-duplex communication device.
  • the directional coupling unit 203 switches the transmission signal and the reception signal in necessary directions.
  • the shared unit 204 shares the transmission and reception operations of the antenna 205 and the transmission and reception of each frequency.
  • the synthesizer 206 synthesizes high-frequency signals, and there are several types of input signals 211-1, 211-2,...
  • the distribution unit 207 distributes the received and amplified signal 217 of the amplification unit 201 to receive outputs 218-1, 218-2,.
  • FIG. 3 is a block diagram of a first modulation / demodulation unit according to an embodiment of the present invention.
  • the modem unit 300 includes an OFDM modem unit 301, an orthogonal modulation unit 302, an orthogonal demodulation unit 303, a local transmission unit 304, and a reference clock generation unit 305.
  • the reference clock generation unit 305 generates a reference clock for performing signal processing of the entire modulation / demodulation unit 300. For example, all the clock signals, radio frequencies (transmission carrier frequency, reception carrier frequency), hopping frequency, and the like necessary for digital processing are all generated from the reference clock.
  • the OFDM (Orthogonal Frequency Division Multiplexing) modulation of the OFDM modulation / demodulation unit 301 converts the digital signal 315 into a predetermined modulation method.
  • the OFDM modulation / demodulation unit 301 arranges necessary subcarriers at frequency intervals that are orthogonal to each other. For example, two-phase PSK (Phase Shift Keying), four-phase PSK, and multi-level QAM are respectively provided. (Quadrature Amplitude Modulation, quadrature amplitude modulation) etc. This processing is performed in the baseband region, and a signal for modulating to the next-stage radio frequency is generated.
  • the modulation input 311 of the quadrature modulation unit 302 is obtained.
  • the quadrature modulation unit 302 requires a SIN waveform and a COS waveform as modulation inputs, and generates them by processing such as IFFT based on the digital data 315.
  • the quadrature modulation unit 302 performs modulation with the high-frequency signal 316 generated by the local transmission unit 304, which is a radio signal, the SIN waveform and the COS waveform, and adds the two signals to obtain a predetermined modulation method.
  • the radio frequency 211 is output.
  • the orthogonal demodulator 303 receives an OFDM signal that is a received signal 218 from a communication partner, demodulates it using the local signal 316 output from the local transmitter 304, and outputs a SIN waveform and a COS waveform signal 314.
  • the OFDM modulation / demodulation unit 301 obtains digital data 315 by performing FFT on the signal 314.
  • the reference clock generation unit 305 is a clock necessary for the processing of the OFDM modulation / demodulation unit 301 and a reference clock necessary for the generation of the local transmission unit 314.
  • the reference clock generation unit 305 serves as a reference for generating all predetermined frequencies and is used in common. Therefore, the reference clock generation unit 305 generates a standard signal with compensated accuracy even if the necessary frequencies are different and the frequencies are different.
  • the reference clock generation unit 305 outputs, for example, a radio frequency (carrier frequency), a signal processing clock, a sampling frequency, a symbol synchronization clock, and the like.
  • FIG. 4 is a block diagram of a second modem according to an embodiment of the present invention.
  • the modem unit 400 includes an OFDM modem unit 401, an orthogonal modulation unit 402, an orthogonal demodulation unit 403, local transmission units 404 and 405, a reference clock generation unit 406, and a frequency setting unit 407.
  • the reference clock generation unit 406 generates a signal serving as a reference for performing processing of the modem unit 400 as a whole. For example, an integer multiple of the sampling frequency, FFT clock, IFFT clock, radio frequency (transmission carrier frequency, reception carrier frequency), hopping frequency, etc. are all generated from this reference clock.
  • the main difference between the modulation / demodulation unit 400 and the modulation / demodulation unit 300 is that the local transmission unit has two systems of the local transmission unit 404 and the local transmission unit 405, the frequency setting unit 407 is controlled by the signal 419, and the local transmission unit for transmission and reception
  • the frequencies of 404 and 405 are set by signals 420 and 421. If there is a delay in the radio wave between the transmitting station and the receiving station, the receiving station must synchronize with the change from the transmitting station based on the received wave. Obtain and control the required delay time difference.
  • FIG. 5 is a diagram for explaining a first band changing method of the communication apparatus according to the embodiment of the present invention.
  • FIG. 5 shows a case where the bandwidth of one subcarrier is the same and the number of the subcarriers is changed.
  • 5A is twice as many as the number in FIG. 5B, and the bandwidth is twice that in FIG. 5B.
  • subcarriers are not generated in the right region by putting “0” in the real part and imaginary part of the complex number as the input of the subcarrier during OFDM modulation.
  • the bandwidth is doubled as an example, but may be multiple times.
  • FIG. 6 is a diagram for explaining a second band changing method of the communication apparatus according to the embodiment of the present invention.
  • FIG. 6 shows an example in which one bandwidth is doubled
  • FIG. 6A generates an OFDM signal with a subcarrier having a half bandwidth compared to FIG. 6B.
  • This generation method is implemented by changing the sampling pulse which is the operating frequency of IFFT and the number of points of IFFT.
  • the subcarrier interval is changed by a combination of a clock obtained by dividing the sampling frequency at the time of IFFT (1 / N, N is an integer) and the number of FFT conversion points.
  • FIG. 7 is a diagram for explaining the signal form of the communication apparatus according to the embodiment of the present invention.
  • FIG. 7A shows a first mode. That is, the subcarrier is arranged as a lower sideband and an upper sideband around the carrier (center dotted arrow).
  • FIG. 7B shows a second form. Increase the number of IFFT conversion points and sampling frequency to generate more subcarriers and use only where necessary. (The IFFT input is set to zero for both the real part and the imaginary part except where necessary.) However, at the time of demodulation, a dotted line arrow is used as a carrier wave, quadrature demodulation is performed, and the output is subjected to FFT and taken out as a received signal only when necessary.
  • IF input
  • a + jB complex signal input
  • FIG. 8 is a diagram for explaining the first frequency hopping of the communication apparatus according to the embodiment of the present invention.
  • the vertical axis represents time
  • the horizontal axis represents frequency
  • the center of each represents the position of the carrier frequency.
  • the signal waveform is generated in the state of the lower sideband and the upper sideband centering on the carrier wave (indicated by the dotted arrow in the center. As in the past, it does not exist theoretically, but due to hard degradation, it actually shows an attenuation state)
  • the transmission frequency is generated as a local transmission frequency using an orthogonal modulation unit, and the transmission frequency is changed (hopped) with time.
  • FIG. 9 is a diagram for explaining the second frequency hopping of the communication apparatus according to the embodiment of the present invention.
  • the communication apparatus performs IFFT over a wide range and realizes frequency hopping by controlling the complex input of IFFT.
  • FIG. 9 only the portions of time 1, time 2, time 3,... Enclosed by a square are input, and the others are performed by setting the complex input to “0”. It is also possible to hop by changing the number of subcarriers depending on the time. Usually, the in-band hopping method is enabled.
  • the filter corresponding to each channel is switched and used, but especially on the transmission side (compared to reception), it is an operation at a place where the power is large, and it is a heavy burden on the filter and its switching. Will be called.
  • the types of filters need to be different in frequency and steeply attenuated.
  • the switching time of the switching unit affects the hopping speed. Insertion of the switching unit causes insertion loss and heat loss.
  • the type of transmission amplifying unit requires heat dissipation measures due to power loss, which affects the size and weight.
  • the filter characteristic needs to use a wide band and a wide band power amplifying unit (a common amplifying unit can be used).
  • a wideband filter and a wideband amplifier it is essential that the frequency is different at the same time (same symbol).
  • FIG. 10 is a diagram for explaining channel frequency allocation to symbol time when frequency hopping is performed by a communication apparatus according to an embodiment of the present invention.
  • FIG. 10 shows an example of using CH1 (channel 1) to CH4. Basically, OCC (One Coincidence Code) is used. However, since the type of OCC is limited, FIG. 11 shows a method for increasing the number.
  • CH1 channel 1
  • OCC One Coincidence Code
  • FIG. 10 shows the case of 4 channels. Since control is performed so that different frequencies are within one symbol and the frequency is OFDM between each frequency, the attenuation outside the band is large, and it can be easily realized with a wider band of the filter and a wide band of the power amplification unit. If signals overlap at the same time and frequency, so-called interference occurs, so it is essential to control so that they do not overlap at any time, and IM (Inter Modulation), which is important as a transmitter, is also reduced. Easy.
  • CH1 is F1
  • CH2 is F2
  • CH3 CH4 is F4 at time t1 (within t1 symbol)
  • FIG. 11 is a diagram for explaining channel frequency assignment when the channel is increased with respect to the symbol time when frequency hopping is performed by the communication apparatus according to the embodiment of the present invention.
  • FIG. 11 shows a method of using a frequency of 4 channels in the channel increasing method and doubling the frequency.
  • F is created by adding 4 to the F numbers of t1, t2, t3, and t4. That is, at t5, 4 is added to “F1” of t1 to obtain F5.
  • At t6, 4 is added to “F2” of t2 to obtain F6.
  • F7 at t7 and F8 at t8 is a diagram for explaining channel frequency assignment when the channel is increased with respect to the symbol time when frequency hopping is performed by the communication apparatus according to the embodiment of the present invention.
  • FIG. 11 shows a method of using a frequency of 4 channels in the channel increasing method and doubling the frequency.
  • F is created by adding 4 to the F numbers of t1, t2, t3, and t4. That is, at
  • t1 to t8 are created with CH2, CH3, and CH4.
  • the areas CH5 to CH8 and t1 to t4 are created by copying the areas CH1 to CH4 and t5 to t8 created above as they are.
  • the CH5 to CH8 and t5 to t8 regions are created by copying the CH1 to CH4 and t1 to t4 regions as they are.
  • FIG. 11 shows a method of increasing the hopping pattern from FIG.
  • the hopping pattern can be increased in the same manner as described above in the same manner as described above by ⁇ 2.
  • FIG. 12 is a diagram for explaining a method of directly creating an allocation of channel frequency at the time of channel increase with respect to a symbol time when frequency hopping is performed by a communication apparatus according to an embodiment of the present invention.
  • FIG. 12 shows a case where the number of channels is increased to six.
  • the frequency F is directly assigned so that channel numbers do not overlap each symbol time.
  • the communication apparatus reduces mutual interference due to orthogonality of subcarriers corresponding to the bandwidth even if two waves of transmission frequencies including subcarriers are close to each other.
  • This is a frequency hopping method in which the frequency is changed for communication, and it is guaranteed that the frequencies at the same time do not overlap.
  • 101, 102, 103, 131, 132 transmitting / receiving station
  • 200 wireless unit
  • 201 amplification unit
  • 203 directional coupling unit
  • 204 shared unit
  • 205 antenna
  • 206 combining unit
  • 207 Distribution unit

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention vise à proposer un dispositif de communication apte à un système de communication à sauts de fréquence qui permet d'assurer qu'il n'y ait pas de chevauchement de fréquences en même temps afin d'éliminer, même si deux ondes d'une fréquence de transmission comprenant une sous-porteuse (qui sont disposées de façon à avoir une relation d'orthogonalité entre elles) sont proches l'une de l'autre, l'interférence mutuelle par une largeur de bande et l'orthogonalité de sous-porteuses correspondant à la bande passante. Ce dispositif de communication effectue une communication à sauts de fréquence et est pourvu d'une unité sans fil et d'une unité de modulation/démodulation, le dispositif de communication étant caractérisé en ce que l'unité sans fil comprend une antenne, une unité de partage, une unité de couplage directionnel, une unité de filtre, une unité d'amplification, une unité de synthèse et une unité de division, l'unité de modulation/démodulation comprenant une unité de modulation/démodulation OFDM, une unité de modulation orthogonale, une unité de démodulation orthogonale, une unité de transmission locale, et une unité de génération d'horloge de référence, et l'unité de génération d'horloge de référence fournit une horloge de référence à l'unité de modulation/démodulation OFDM et à l'unité de transmission locale.
PCT/JP2016/083554 2015-11-25 2016-11-11 Dispositif et procédé de communication Ceased WO2017090467A1 (fr)

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JP2017552363A JP6497825B2 (ja) 2015-11-25 2016-11-11 通信装置及び通信方法

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JP2015-229614 2015-11-25

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2017130298A1 (ja) * 2016-01-26 2018-11-22 株式会社日立国際電気 中継／通信局装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000269923A (ja) * 1999-03-19 2000-09-29 Toshiba Corp 外部装置同期機能をもつｏｆｄｍ変調器
JP2009111626A (ja) * 2007-10-29 2009-05-21 Softbank Telecom Corp 移動体向けのｉｐデータ無線通信システムの干渉低減装置、並びにこれを用いた無線通信基地局装置及び移動体端末装置
JP2010252178A (ja) * 2009-04-17 2010-11-04 Nippon Telegr & Teleph Corp <Ntt> ディジタル無線通信装置
JP2010279041A (ja) * 2009-05-29 2010-12-09 Samsung Electronics Co Ltd ベースバンドプロセッサ及びそれを含む通信装置
JP2013501413A (ja) * 2009-07-29 2013-01-10 マーベル ワールド トレード リミテッド Ｗｌａｎ送信のための方法および装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2014122848A (ru) * 2011-11-07 2015-12-20 Тейджин Арамид Б.В. Баллистически стойкое изделие, включающее в себя полиэтиленовые ленты

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000269923A (ja) * 1999-03-19 2000-09-29 Toshiba Corp 外部装置同期機能をもつｏｆｄｍ変調器
JP2009111626A (ja) * 2007-10-29 2009-05-21 Softbank Telecom Corp 移動体向けのｉｐデータ無線通信システムの干渉低減装置、並びにこれを用いた無線通信基地局装置及び移動体端末装置
JP2010252178A (ja) * 2009-04-17 2010-11-04 Nippon Telegr & Teleph Corp <Ntt> ディジタル無線通信装置
JP2010279041A (ja) * 2009-05-29 2010-12-09 Samsung Electronics Co Ltd ベースバンドプロセッサ及びそれを含む通信装置
JP2013501413A (ja) * 2009-07-29 2013-01-10 マーベル ワールド トレード リミテッド Ｗｌａｎ送信のための方法および装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2017130298A1 (ja) * 2016-01-26 2018-11-22 株式会社日立国際電気 中継／通信局装置

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JP6497825B2 (ja) 2019-04-10

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