JP2011071624A - Millimeter wave band transmission system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively use frequencies to transmit a satellite signal from two geostationary satellites between buildings in a building shadow. <P>SOLUTION: A first transmitter 20 applies frequency conversion to first and second satellite intermediate frequency signals to obtain first and second millimeter wave band signals with almost same frequency band of different polarized waves. Then, the first transmitter transmits the first and the second millimeter wave band signals to a building in a building shadow. A first receiver 30 located at the building in the building shadow receives the first and the second millimeter wave band signals, and applies frequency conversion to obtain the first and the second original satellite intermediate frequency signals. A second transmitter 42 located at the building in the building shadow carries out re-conversion into the first and second millimeter wave band signals to transmit them from the roof. Each of a plurality of second receivers located respectively at a different position on the building in the building shadow receives the first and the second millimeter wave band signals, and applies frequency conversion to obtain the first and the second original satellite intermediate frequency signals. A third transmitter 62 located at the building in the building shadow carries out frequency conversion for the first and the second satellite intermediate frequency signals from the first receiver 30 to obtain the first and the second millimeter wave band signals and transmit them to a building in another building shadow. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a millimeter wave band transmission system that converts a satellite signal transmitted from a geostationary satellite such as a broadcast satellite or a communication satellite into a millimeter wave band and transmits the converted signal.

  As such a millimeter wave transmission system, there is one disclosed in Patent Document 1, for example. According to the technology of the patent document, a first millimeter wave transmitter installed on the roof of a high-rise building transmits a millimeter-wave band signal downward, and a plurality of first millimeter waves are sent to a high-rise floor of the high-rise building. A band receiver is installed to receive a millimeter wave band signal from the first millimeter wave band transmitter. A second millimeter-wave transmitter installed on the middle floor of a high-rise building transmits millimeter-wave signals downward, and a plurality of second millimeter-wave receivers are installed on the lower floor of the high-rise building. The millimeter wave band signal from the second millimeter wave band transmitter is received. The millimeter wave band signals transmitted by the first and second transmitters are obtained by frequency-converting satellite broadcast signals and satellite communication signals received on the rooftops of high-rise buildings into the millimeter wave band.

Patent No. 4420387

  In the technique of Patent Document 1, it is possible to transmit a millimeter wave signal to each room of a high-rise building. In each room, by converting the frequency of the millimeter wave signal into the original satellite broadcast signal and satellite communication signal, the satellite broadcast is performed. And satellite communications. However, since the technology of Patent Document 1 is a high-rise building, it can receive satellite broadcast signals and satellite communication signals that are the source of millimeter wave signals. In buildings where signals and satellite communication signals cannot be received directly, it is necessary to transmit millimeter wave signals to this building.

  An object of this invention is to provide the millimeter wave transmission system which can transmit a millimeter wave signal to the building in a building shadow using the frequency effectively.

  The millimeter wave band transmission system of one embodiment of the present invention includes first transmission means. The first transmission means receives a first millimeter waveband signal obtained by frequency-converting a first satellite intermediate frequency signal based on the received first satellite signal from the first geostationary satellite into a millimeter waveband signal. A second millimeter-wave band signal obtained by frequency-converting a second satellite intermediate frequency signal based on a second satellite signal from a second geostationary satellite into the millimeter-wave band signal is placed in the building shadow and the first and second The first and second satellite signals are transmitted from the two geostationary satellites to the building where the first and second satellite signals are not reached. The first and second millimeter waveband signals are signals in substantially the same frequency band and have different polarizations. For example, in the case of linear polarization, vertical polarization and horizontal polarization are used. In the case of circular polarization, right-handed circular polarization and left-handed circular polarization are used. Both or one of the first and second millimeter wave band signals may include a terrestrial television broadcast signal, for example, a terrestrial digital broadcast signal obtained by frequency conversion to the millimeter wave band. The first receiving means is provided in the building in the shadow of the building. The first receiving means receives the first and second millimeter waveband signals transmitted from the first transmitting means, and frequency-converts them to the original first and second satellite intermediate frequency signals. The second transmission means is provided in the building in the building shadow. The second transmitting means reconverts the first and second satellite intermediate frequency signals from the first receiving means into first and second millimeter waveband signals, and follows the height direction of the building in the building shadow. To send. A plurality of second receiving means are provided at different positions of the building in the building shadow. Each second receiving means receives the first and second millimeter waveband signals transmitted from the second transmitting means, and converts them into the original first and second satellite intermediate frequency signals. A third transmission means is provided in the building in the building shadow. The third transmitting means converts the frequency of at least one of the first and second satellite intermediate frequency signals from the first receiving means into a corresponding one of the first and second millimeter waveband signals, and generates another building. Send to the building in the shadow.

  In the millimeter wave band transmission system configured as described above, the first and second millimeter wave band signals obtained by converting the frequency of the first and second satellite intermediate frequency signals by the first transmission means are transmitted to the building in the shadow of the building. Since the first and second millimeter waveband signals are converted into the original first and second satellite broadcast intermediate frequency signals by the first receiving means, the first and second signals are added to the building in the building shadow. Satellite intermediate frequency signals can be transmitted wirelessly. In addition, since the first and second millimeter-wave band signals are signals in substantially the same frequency band and have different polarizations, the frequency can be effectively used. Also, the first and second satellite intermediate frequency signals from the first receiving means are transmitted by the second transmitting means along the height direction of the building in the building shadow, and this is transmitted to the plurality of buildings in the building shadow. Since the second receiving means receives and converts the frequency into the original first and second satellite intermediate frequency signals, the satellite signals from the first and second geostationary satellites are received at various locations in the building shadow. can do. Also in this case, since the first and second millimeter waveband signals having different polarizations in substantially the same frequency band are used, the frequency can be effectively used. Further, at least one of the first and second satellite intermediate frequency signals received by the first receiving means is converted by the third transmitting means into a corresponding one of the first and second millimeter waveband signals. Because it is transmitting to another building in the building shadow, by installing a third receiving means corresponding to the third transmitting means in another building in the building shadow, in another building in the building shadow, At least one of the first and second satellite intermediate frequency signals can be received.

  The third transmission means may frequency-convert the first and second satellite intermediate frequency signals into the first and second millimeter waveband signals and transmit them to another building in the building shadow. In this case, another building in the building shadow can receive both the first and second satellite signals.

  Both the first transmitting and receiving means may have a common antenna for the first and second millimeter waveband signals having different polarizations. If comprised in this way, the structure of a 1st transmission and reception means can be simplified.

  As described above, according to the present invention, the first and second satellite intermediate frequencies based on the first and second satellite signals from the two geostationary satellites using the frequency effectively for the building in the shadow of the building. Signals can be transmitted, and the first and second satellite intermediate frequency signals can be transmitted to various places in the building shadow by effectively using the frequency.

It is a block diagram of the millimeter wave transmission system of one embodiment of the present invention. It is a wave form diagram of the millimeter wave band signal used with the millimeter wave transmission system of FIG. FIG. 2 is a layout view of devices used in the millimeter wave transmission system of FIG. 1.

  The millimeter wave transmission system according to an embodiment of the present invention is in the shadow of a high-rise building 2 as shown in FIG. 3, and the first and second geostationary satellites such as BS / CS110 degree satellites and JCSAT satellites. 1 and 2 satellite signals and UHF terrestrial digital television broadcast signals cannot be directly received in buildings 4, 6 and 8, these signals are converted to millimeter wave band signals and transmitted wirelessly. To do.

  For receiving the first satellite signal from the BS / CS110 degree satellite on the rooftop of the building 10 that can receive the first and second satellite signals and the digital terrestrial television broadcast signal without being in the shadow of the building 2. A receiving antenna 12, an antenna 14 for receiving a second satellite signal from the JCSAT satellite, and an antenna 16 for receiving a terrestrial digital television broadcast signal are installed. The first satellite signal received by the receiving antenna 12 includes a satellite broadcast signal (BS) and a 110 degree CS signal in a different frequency band. As shown in FIG. 1, a converter attached to the receiving antenna 12 At 12c, the frequency is converted into the first satellite intermediate frequency signal. The first satellite intermediate frequency signal is frequency-converted so that the frequency arrangement is in the order of the intermediate frequency signal of the satellite broadcast signal and the intermediate frequency signal of the 110-degree CS signal. Similarly, the second satellite signal received by the receiving antenna 14 includes a vertical polarization signal and a horizontal polarization signal of JCSAT 4 in substantially the same frequency band, and a vertical polarization signal and a horizontal polarization signal of JCSAT 3 in substantially the same frequency band. Consists of. A converter 14c attached to the receiving antenna 14 converts the frequency into a second satellite intermediate frequency signal. In the second satellite broadcast intermediate frequency signal, the intermediate frequency signal of the vertical polarization signal of JCSAT4, the intermediate frequency signal of the horizontal polarization signal, the intermediate frequency signal of the vertical polarization signal of JCSAT3, and the intermediate frequency signal of the horizontal polarization signal The frequency is converted so that the frequency arrangement is as follows.

  The first satellite intermediate frequency signal from the converter 12c is synthesized with the terrestrial digital television broadcast signal by the synthesizer 18, and the first transmission means, for example, the first transmission converter 22 for horizontal polarization of the first transmitter 20, performs the first. Frequency conversion to millimeter waveband signal. Further, the second satellite intermediate frequency signal from the converter 14c is supplied to the first transmission converter 24 for vertical polarization of the first transmitter 20 and is frequency-converted into a second millimeter waveband signal. As shown in FIG. 2, the first millimeter-wave band signal is, for example, a horizontal polarization signal, the second millimeter-wave band signal is a vertical polarization signal, and both frequency bands are substantially the same. The first and second millimeter waveband signals are supplied to an ortho mode transducer (OMT) 26 where they are combined and transmitted by a common horn antenna 28 for the first and second millimeterband signals. As shown in FIG. 3, the first transmitter 20 transmits the first and second millimeter wave signals toward the roof of the building 4.

  On the roof of the building 4, first receiving means, for example, a first receiver 30 is arranged. As shown in FIG. 1, the first receiver 30 has a common horn antenna 32 that receives the first and second millimeter waveband signals. The first and second millimeter waveband signals are horizontally shifted by the OMT 34. The first millimeter wave band signal is separated into the vertically polarized second millimeter wave band signal, the first millimeter wave band signal is supplied to the first receiving converter 36 for horizontal polarization, and the second millimeter wave band signal is vertically supplied. It is supplied to the first receiving converter 38 for polarization. The first receiving converter 36 for horizontal polarization converts the frequency of the first millimeter waveband signal into the original digital terrestrial television broadcast signal and the first satellite intermediate frequency signal. Similarly, the first receiving converter 38 for vertical polarization converts the frequency of the second millimeter waveband signal into a second satellite intermediate frequency signal. As described above, the transmission between the buildings 10 and 4 wirelessly transmits the first and second millimeter waveband signals having different polarizations in the same frequency band. Effective use can be achieved.

  The original digital terrestrial television broadcast signal and the first satellite intermediate frequency signal from the first receiving converter 36 for horizontal polarization are distributed by the distributor 40, and one distribution output thereof is the second transmission means, for example, the second transmission means. The signal is supplied to the second transmission converter 44 for horizontal polarization of the transmitter 42 and is frequency-converted again into the first millimeter waveband signal. Similarly, the second satellite intermediate frequency signal from the first reception converter 38 for vertical polarization is distributed by the distributor 46, and one distribution output thereof is the second transmission converter 48 for vertical polarization of the second transmitter 42. And frequency-converted to a second millimeter-wave band signal. The second transmission converters 44 and 48 for horizontal polarization and vertical polarization respectively have radio wave lens antennas 50 and 52 as transmission antennas, and the first millimeter waveband signal of horizontal polarization is transmitted from the radio wave lens antenna 50. The second millimeter waveband signal of vertical polarization is transmitted from the radio wave lens antenna 52.

  As shown in FIG. 3, the second transmission converters 44 and 48 for horizontally polarized waves and vertically polarized waves are arranged on the roof of the building 4 so that the radio wave lens antennas 50 and 52 face the ground. A millimeter wave band signal is transmitted to each room of the building 4. The radio lens antennas 50 and 52 are used because the beam width is wide and the first and second millimeter waveband signals can be transmitted to each room of the building 4.

  A second receiving converter 54 for horizontally polarized waves for receiving a first millimeter-wave band signal of the second receiver 53, for example, a second receiver 53 is installed at the window or veranda of each room on each floor of the building 4. Yes. The second receiving converter 54 for horizontal polarization also includes a radio wave lens antenna 56 as a receiving antenna. Similarly, a second receiving converter 58 for vertical polarization for receiving the second millimeter-wave band signal of the second receiver 53 is installed at the window or veranda of each room on each floor of the building 4. The second receiving converter 58 for horizontal polarization also includes a radio wave lens antenna 60 as a receiving antenna.

  The second receiving converter 54 for horizontal polarization receives the first millimeter-wave band signal, converts the frequency into the original digital terrestrial television broadcast signal and the first satellite intermediate frequency signal, and the second receiving converter 58 for vertical polarization. Converts the second millimeter-wave band signal into the original second satellite intermediate frequency signal. These frequency-converted terrestrial digital television broadcast signals and first and second satellite intermediate frequency signals are supplied to the television receivers in each room, where terrestrial digital television broadcasts, satellite broadcasts, and satellite communications are performed. Watched. Since the first and second millimeter waveband signals having different polarizations in the same frequency band are transmitted wirelessly without using a cable and are transmitted within the building 4, no cable laying is required and the frequency Can be used effectively.

  The terrestrial digital television broadcast signal and the first satellite intermediate frequency signal distributed from the distributor 40 are supplied to the third transmission means, for example, the third transmission converter 64 for horizontal polarization of the third transmitter 62, and are supplied with the horizontal deviation. The frequency is converted to a first millimeter-wave band signal. The second satellite intermediate frequency signal distributed from the distributor 46 is supplied to the third transmission converter 66 for vertical polarization of the third transmitter 62 and is frequency-converted to a second millimeter waveband signal of vertical polarization. The frequency-converted first and second millimeter waveband signals are combined by the OMT 68 and transmitted by the common horn antenna 70 for the first and second millimeter waveband signals. As shown in FIG. 3, the third transmitter 62 is arranged to transmit toward the roof of the building 6.

  On the roof of the building 6, third receiving means, for example, a third receiver 64 is installed. The third receiver 64 has the same configuration as that of the first receiver 30, and the first and second millimeter-band signals received thereby are the original digital terrestrial television broadcast signal and the first satellite intermediate frequency signal. The frequency is converted to the second satellite intermediate frequency signal. These are supplied to a fourth transmission means, for example, a fourth transmitter 66. The fourth transmitter 66 includes horizontal and vertical polarization fourth transmission converters 68 and 70 having the same configuration as the horizontal transmission and vertical polarization second transmission converters 44 and 48 of the second transmitter 42. The terrestrial digital television broadcast signal, the first satellite intermediate frequency signal, and the second satellite intermediate frequency signal are frequency-converted into first and second millimeter wave band signals. The fourth transmission converters 68 and 70 for horizontal and vertical polarization have radio wave lens antennas 106 and 108, and the second transmission converters 68 and 108 for the horizontal polarization and the second transmission converters 44 and 48 for horizontal polarization use It is installed on the rooftop so as to transmit the first and second millimeter waveband signals. The fourth receiving means, for example, the fourth receiving converters 74 and 76 for horizontal polarization and vertical polarization of the fourth receiver 72 are installed at the window or veranda of each room on each floor of the building 6. . The fourth receiving converters 74 and 76 for horizontal polarization and vertical polarization have the same configuration as the second receiving converters 54 and 58 for horizontal polarization and vertical polarization, and have radio wave lens antennas 78 and 80, respectively. ing. Therefore, also in the building 6, the terrestrial digital television broadcast signal and the first and second satellite intermediate frequency signals are supplied to the television receivers in the rooms.

  Further, as shown in FIG. 1, the terrestrial digital television broadcast signal and the first satellite intermediate frequency signal distributed from the distributor 40 are supplied to another horizontal polarization third transmission converter 84 of another third transmitter 82. Is frequency-converted to a first millimeter-wave band signal and transmitted from the horn antenna 86. As shown in FIG. 3, this other third transmitter 82 is connected to the first millimeter wave toward the rooftop of the building 8 that needs to receive only terrestrial digital television broadcasts and broadcasts from BS / CS110 degree satellites. A band signal is transmitted.

  On the roof of the building 8, another third receiver 88 is arranged to receive the first millimeter waveband signal from the other third transmitter 82. Another third receiver 88 has the same configuration as the horn antenna 90 having the same configuration as the horn antenna 32 of the first receiver 30 and the first receiving converter 36 for horizontal polarization of the first receiver 30 for horizontal polarization. And a third receiving converter 92 for horizontally polarized waves, and frequency-converts the first millimeter waveband signal into a terrestrial digital television broadcast signal and a first satellite intermediate frequency signal. The terrestrial digital television broadcast signal and the first satellite intermediate frequency signal are supplied to another fourth transmitter 94. The other fourth transmitter 94 includes another fourth transmission converter 96 for horizontal polarization having the same configuration as the second transmission converter 44 for horizontal polarization of the second transmitter 42, and the digital terrestrial television broadcast signal. The first satellite intermediate frequency signal is frequency-converted into a first millimeter waveband signal and transmitted from the radio wave lens antenna 98. Another fourth transmitter 94 transmits a first millimeter-wave band signal from the roof of the building 8 toward the ground side. A fourth receiving converter 102 for horizontal polarization of another fourth receiver 100 is installed at the window or veranda of each room on each floor of the building 8. The horizontal polarization fourth reception converter 102 has the same configuration as the horizontal polarization second reception converter 54 and includes a radio wave lens antenna 104. Accordingly, also in the building 8, the digital terrestrial television broadcast signal and the first satellite intermediate frequency signal are supplied to the television receiver in each room.

  In the above embodiment, the first and second millimeter waveband signals are wirelessly transmitted from the building 10 toward the building 4 in the shadow of the building, but the first and second millimeter waveband signals are wirelessly transmitted from the building 2. You can also. In the above embodiment, the terrestrial digital television broadcast signal is also transmitted wirelessly, but it may not be necessary in some cases. In the above embodiment, only the first millimeter-wave band signal is transmitted from the building 4 to the building 8. However, in some cases, it is unnecessary, and the first and second millimeter-wave bands are directed from the building 4 to the building 8. Signals can also be transmitted.

4 6 8 Building in shadow of building 20 First transmitter (first transmitting means)
30 First receiver (first receiving means)
42 Second transmitter (second transmission means)
53 Second receiving means 62 Third transmitter (third transmitting means)
64 Third receiver (third receiving means)

Claims (3)

From the first millimeter wave band signal obtained by frequency-converting the first satellite intermediate frequency signal based on the received first satellite signal from the first geostationary satellite into a millimeter wave band signal, and from the received second geostationary satellite The second millimeter waveband signal obtained by frequency-converting the second satellite intermediate frequency signal based on the second satellite signal to the millimeter waveband signal from the first and second geostationary satellites in the building shadow. First and second satellite signals are transmitted to a non-reachable building, and the first and second millimeter waveband signals are signals of substantially the same frequency band and have different polarizations;
The first reception is provided in the building in the shadow of the building and receives the first and second millimeter waveband signals transmitted from the first transmission means and converts the frequency into the original first and second satellite intermediate frequency signals. Means,
The first and second satellite intermediate frequency signals provided in the building in the building shadow are reconverted into first and second millimeter waveband signals, and the height of the building in the building shadow is increased. Second transmitting means for transmitting along the direction,
The first and second millimeter waveband signals provided at different positions of the building in the building shadow and transmitted from the second transmitting means are received and converted into the original first and second satellite intermediate frequency signals. A plurality of second receiving means;
Provided in the building in the building shadow, frequency-converts at least one of the first and second satellite intermediate frequency signals from the first receiving means into the corresponding one of the first and second millimeter waveband signals. , Third transmission means for transmitting to a building in another building shadow,
Equipped with millimeter wave band transmission system.   2. The millimeter wave band transmission system according to claim 1, wherein the third transmission means performs frequency conversion of the first and second satellite intermediate frequency signals into the first and second millimeter wave band signals, Millimeter wave transmission system that transmits to buildings.   2. The millimeter wave band transmission system according to claim 1, wherein both the first transmission and reception means have a common antenna for the first and second millimeter wave band signals having different polarizations.

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