JP3553383B2 - Wireless transmitting / receiving method and wireless transmitting / receiving system - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method of wirelessly transmitting and receiving a wideband signal such as a BS and a CS, and more particularly, to a method of wirelessly transmitting and receiving a wideband signal indoors or in a premises using a millimeter wave.
[0002]
[Prior art]
Generally, in mobile radio communication, diversity reception has been devised in order to perform stable reception while avoiding the effects of multipath fading. Further, in order to receive a plurality of channels, Japanese Patent Application Laid-Open No. 5-29995 discloses As shown, a method using a reception intensity comparison circuit and an antenna switching circuit for the number of channels has been devised.
[0003]
As an apparatus disclosed in Japanese Patent Application Laid-Open No. Hei 5-29995, which collectively receives a large number of radio waves including multi-channel signals, the present application will describe a case where the present invention is applied to broadcast communication such as satellite broadcasting. FIG. 11 shows a wireless transmission / reception device of the prior art.
[0004]
A multi-channel transmission signal 1004 in which each channel is arranged on the frequency axis is transmitted from the transmission antenna 1001. Intensity is significantly reduced in some channels due to the effect of fading due to multipath in spatial transmission. Therefore, when reception is performed by a plurality of antennas 1002 and 1003, reception is performed by selecting an antenna having high intensity in each channel (diversity). Receive). For example, for the channel 1005 of the received signal, the antenna 1003 having the strong channel 1005 is selected, and for the channel 1006 of the received signal, the antenna 1002 having the strong channel 1006 is independently selected. As a result, stable reception is possible on a plurality of channels.
[0005]
[Problems to be solved by the invention]
The information of each channel of the transmission signal 1004 is a TV video signal, and in order to display a video on a CRT with multiple screens, the number of selection circuits for the antennas 1002 and 1003 is required. If only the counter program is displayed, two channels are required, and 16 channels are required to display a plurality of channels on a 16-split screen. Also, considering a case where transmission methods are different between channels such that a certain channel is a digital signal and a certain channel is an analog signal, an antenna switching circuit corresponding to each transmission method is required, which is very complicated. System.
[0006]
In the above method, it is inevitable that a diversity circuit of the number of channels is required, and in Japanese Patent Application Laid-Open No. 5-29995, a device is devised to reduce the number of circuits. Only a reception intensity comparison circuit and an antenna switching circuit are required. Further, in the case of this system, it is necessary that the diversity circuit follows the diversity circuit when the reception channel is switched, and switches the evaluation frequency, and the entire reception system needs to be a system dedicated to the diversity circuit.
[0007]
An object of the present invention is to provide a wireless transmission / reception method capable of receiving a wideband signal including multiple channels without requiring a diversity circuit of the number of channels.
[0008]
[Means for Solving the Problems]
A first wireless transmission / reception method according to the present invention is a wireless transmission / reception method having a plurality of paths for transmitting / receiving a wideband signal including multiple channels from a transmitter to a receiver via a receiving antenna, wherein the wideband signal is superimposed by multipath. It is characterized by selecting a route that does not exist.
[0009]
In a second wireless transmission / reception method according to the present invention, the wideband signal is a millimeter wave band signal.
[0010]
In the third radio transmission / reception method of the present invention, a reference signal having the same signal strength on a plurality of frequencies is inserted into the wideband signal and transmitted, and a path having a small signal strength difference between the received plurality of reference signals is selected. A path on which a wideband signal is not superimposed by the multipath is selected.
[0011]
The fourth wireless transmission / reception method of the present invention transmits the reference signal having a constant signal strength to the broadband signal by frequency sweeping, and selects a path having a small signal strength difference during sweeping of the received reference signal, A path on which a wideband signal is not superimposed is selected by multipath.
[0012]
The fifth radio transmitting and receiving method according to the present invention is characterized in that the spectrum information in the signal band is inserted and transmitted on a frequency different from the wideband signal, and the frequency distribution of the received wideband signal is compared with the spectrum information in the signal band. Then, by selecting a path having a small difference between the frequency distribution of the wideband signal and the spectrum information in the signal band, a path on which the wideband signal is not superimposed by the multipath is selected.
[0013]
Also, in the sixth radio transmission / reception method of the present invention, a path in which the strength of the received reference signal is high is selected from paths in which a wideband signal is not superimposed by the multipath of any of the third to fifth radio transmission / reception methods. It is characterized by doing.
[0014]
Also, in the seventh radio transmission / reception method of the present invention, at the start of transmission or at the start of reception , a plurality of paths on which the wideband signal is not superimposed by the multipath are selected by any of the third to fifth radio transmission / reception methods. Then, by appropriately inserting a reference signal at a frequency different from that of the wideband signal, a path having a high strength of the received reference signal is selected.
[0015]
An eighth wireless transmission / reception method according to the present invention is characterized in that the antenna is movable, and the direction of the antenna is selected by any of the third to seventh wireless transmission / reception methods .
[0016]
In a ninth wireless transmission / reception method according to the present invention, the antenna is a phase array antenna.
[0017]
A tenth wireless transmission / reception method according to the present invention is characterized in that the arrangement of the antennas is angle diversity.
[0018]
An eleventh wireless transmission / reception method according to the present invention is characterized in that the arrangement of the antenna is position diversity.
[0019]
A twelfth wireless transmission / reception method according to the present invention is characterized in that the antenna arrangement is frequency diversity.
[0020]
Also, a thirteenth wireless transmission / reception method of the present invention is characterized in that the transmitter includes a directional antenna.
[0021]
A fourteenth wireless transmission / reception method according to the present invention is characterized in that the transmitter includes a plurality of or repeaters.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
(Example 1)
FIG. 1 shows an embodiment of a wireless transmission / reception method according to the present invention. Here, an example of a system for simultaneously transmitting and receiving all channels of BS and CS broadcasts will be described.
[0023]
Since the number of channels is large, all the channels are shown as one ultra wideband signal (60 GHz to 61.5 GHz) 105. The transmitter receives BS and CS broadcasts, converts them to IF frequencies of about 1 to 1.5 GHz using a block converter used in general apartment buildings, and converts them to millimeter waves (60 to 61.5 GHz). And the ultra wideband signal 105 is transmitted from the transmission antenna 101. Ultra wideband signal 105 is received by a plurality of receiving antennas 102, 103, 104.
[0024]
At this time, in the present embodiment, it is assumed that the reception status is as follows. Due to the multipath in the receiving antenna 102, the received signal 106 is a received signal 106 in which the strength of some of the signals is significantly reduced. The receiving antenna 103 receives only a direct wave from the transmitting antenna, and becomes a received signal 107 having no difference in intensity between the channels. The reception antenna 103 receives the reflected wave, and thus has a low reception intensity, but has no multipath, and thus has a reception signal 108 having no channel with a significantly low reception intensity. In this case, good reception becomes possible by selecting the reception antenna 103. Further, when the reception sensitivity of the receiving antenna 103 is reduced (shading) due to a person blocking the transmitting / receiving antenna or the like, switching to the receiving antenna 104 enables stable reception. A specific method for selecting the receiving antennas 103 and 104 will be described below.
[0025]
FIG. 2A shows a method for selecting an optimum receiving antenna in the first embodiment. A plurality of reference signals 205 having the same signal strength and different frequencies from the ultra-wideband signal 206 are transmitted from the transmitting antenna 201 at the same time. If the signal strengths of the plurality of reference signals at the time of reception are different, it is determined that the path has a multipath. In the present embodiment, when the signal strength of a part of the reference signal 207 received by the receiving antenna 202 includes a small signal strength, the received signal 208 has a remarkable decrease in the strength of a part of the signal. I understand. Therefore, when the signal is received by the receiving antenna 202, the receiving sensitivity is greatly reduced in all the frequencies of the actual received video signal, even if the lowest signal strength of the plurality of reference signals 207 is not lower than the receiving sensitivity. Since the received signal 208 includes a channel that is present, a signal having a certain difference or more is excluded as a signal including a multipath.
[0026]
Further, for antennas having the same signal strength of a plurality of received reference signals, the receiving antennas are selected in descending order of the strength of the reference signals. In the present embodiment, in the case of the receiving antennas 203 and 204, the received reference signals 209 and 211 are the same, and the receiving signals 210 and 212 are not affected by multipath. In this case, the receiving antenna 203 having a large signal strength of the received reference signal is selected. Note that the route to the receiving antenna 203 is an example in which a single path is a route directly transmitted and received from the direct transmitting antenna to the receiving antenna, and the route to the receiving antenna 204 is a route reflected during transmission and reception. It is an example.
[0027]
Next, FIG. 2B illustrates a circuit example of a receiving device used for the wireless transmission / reception method described with reference to FIG. The signal received by the receiving antenna 231 is amplified by the RF amplifier 232, enters the mixer 234, is mixed with the frequency from the local oscillator 233, becomes a signal in the IF frequency band, and a reference signal is extracted by the filter 236. Enter 237. FIG. 2B shows an example of three antennas, and three circuits having the same configuration are arranged in parallel, and each of them is input to the reference signal comparison circuit. The reference signal comparison circuit 237 selects the most suitable antenna based on the reference signal, and turns the switch 238 ON and OFF. The output from the mixer 234 is also input to the filter 235, and the filter 235 outputs a broadband signal, which is output to the IF signal output terminal 239 through the switch 238. If a normal BS or CS broadcast IF signal receiving device is connected to the IF signal output terminal, any channel can be selected only by selecting the channel of the receiving device. It is also possible to connect a plurality of receivers and independently select different channels.
[0028]
In the present embodiment, by providing a plurality of receiving antennas, an optimum antenna is selected from the plurality of receiving antennas. However, the present invention is applied to making one receiving antenna movable and determining an optimum position of the receiving antenna. May be used.
[0029]
(Example 2)
FIG. 3 illustrates an example of an antenna selection method different from that of the first embodiment.
A reference signal 305 that has been frequency-swept on a frequency different from that of the ultra-wideband signal 306 is transmitted from a transmitting antenna 301. If the signal strength of the received reference signal changes during the sweep, it is determined that the path has a multipath, and the receiving antenna used for the path is excluded. In the present embodiment, the signal intensity changes during the sweep of the reference signal received by the receiving antenna 302, and the receiving antenna 302 is excluded because there is a change exceeding a certain value. Here, the change exceeding a certain value is a value appropriately determined by the user according to the use environment and the like.
[0030]
If the received reference signal does not change during the sweep, a path having a large reference signal strength is selected. In the case of the present embodiment, the signal strength of the reference signal 309 received by the reception antenna 303 and the signal strength of the reference signal 311 received by the reception antenna 304 are compared, and the path of the reception antenna 303 having a large signal strength is selected. .
[0031]
Further, the antennas are selected in the order in which the strength of the reference signal is large in the path where the strength of the reference signal has not changed. Therefore, in the present embodiment, the path of the receiving antenna 303 having a large received reference signal strength is selected.
[0032]
In the case where the frequency sweep is performed and the path is selected based on the change as in the present embodiment, the sampling frequency can be increased more than in the case of the first embodiment, which is very effective in finding a multipath.
[0033]
FIG. 4 shows a method for more surely eliminating a multipath route. In FIG. 4, sweep 402 of the reference signal is performed in the same or wider frequency band than signal frequency band 401. By performing a sweep 402 wider than the signal frequency band 401, the presence or absence of fading can be reliably checked.
[0034]
(Example 3)
FIG. 5 shows a method of checking the presence or absence of multipath by using a signal such as an actual video, which is different from a fixed reference signal as in the first and second embodiments.
[0035]
Actual video signals, audio signals, and the like have different intensities and bandwidths, and since they vary with time, the state is simplified and shown in the ultra-wide band signal 507. The ultra-wide band signal 507 of the present embodiment has three bands including a certain band signal 506 (band signal with an arrow). The spectrum information 505 in the band signal is added separately from the actual ultra-wide band signal 507 and transmitted from the transmission antenna 501.
[0036]
Here, the spectrum information 505 in the signal band includes the intensity information of the ultra-wide band signal 507, and compares the signal actually received by the receiver with the spectrum information in the band signal to check for the presence or absence of multipath. Thus, the presence or absence of multipath is determined. In this example, a signal obtained by sweeping the signal strength of the ultra-wide band signal 507 on the frequency axis as the spectrum information 505 in the band signal is AM-modulated and transmitted. The intensity information signal is transmitted to have the same intensity as the current sweep portion (band signal 506).
[0037]
Since the spectrum information 505 in the band signal and the actual signal (band signal 506) are at different frequencies, it is assumed that there is a multipath like the receiving antenna 502 at each frequency expected from the spectrum information 505 in the received band signal. Are different from the actual signal strength (solid line). Since the reception antennas 503 and 504 have a single path, the spectrum information and the actual signal (band signal 506) have the same strength.
[0038]
In this method, it is possible to check the presence or absence of multipath in the entire actual channel frequency, and furthermore, it is only necessary to add spectral information in the signal band for comparison, so that the frequency band to be used can be realized with almost no increase. .
[0039]
Naturally, not only the spectrum information 505 in the band signal but also the information signal of the frequency sweep may be input, and it is possible without the AM modulation. Here, the reason why the AM modulation is used is that even when the signal intensity is reduced by the reflection (the receiving antenna 504), the intensity signal information also has the advantage of being directly compared because the intensity is similarly reduced. This method can always check all the frequencies in use, as opposed to frequency sweeping with a fixed reference signal.
[0040]
(Example 4)
In this embodiment, an actual operation according to the present invention will be described. Most simply, at the start of transmission or the start of reception, the presence or absence of multipath is checked once by frequency sweep. FIG. 6A shows a state of the frequency sweep. At this time, it is possible to select the most suitable antenna and then use the most suitable antenna. FIG. 6B shows a wideband signal. This case is effective when shadowing, multipath change, and the like do not occur during reception in a location having a very good reception state. Here, the method is based on the frequency sweep, but the spectrum information described in the third embodiment may be used.
[0041]
If there is a human movement and shadowing occurs, the frequency sweep is performed once at the start of transmission or at the start of reception as shown in FIG. 7 (the frequency sweep transmitted at this time is shown in FIG. 7A). To check the presence or absence of multipath and select a suitable plurality of antennas. Thereafter, it is possible to use a method in which the reference signal 604 having a high intensity is used at regular intervals by using the above-described reference signal. This situation is shown in FIG. In this case, the antenna is selected so that the reception signal 601 can be received. Next, as shown in FIG. 7C, when the strength of the received signal 605 decreases due to shadowing, an antenna capable of receiving another received signal 606 is used based on the reference signal 608 having a large signal strength at this time. When the operation as shown in FIG. 7 is performed, humans are mainly radio wave absorbers, and are suitable for communication in the millimeter wave band where reflection is almost negligible.
[0042]
Even in the case of millimeter-wave communication, when doors, windows, blinds, and other large objects that reflect millimeter waves move, the occurrence of new multipath paths cannot be ignored, so use a radio wave absorber for those objects. It is good to attach.
[0043]
In this method, after the multipath is evaluated first, the evaluation is performed only with the reference signal strength, so that the configuration can be simplified. In the above example, the influence of the multipath is evaluated by the frequency sweep, but a method as in the first and third embodiments may be used.
[0044]
In this embodiment, the multipath check is performed at the start of transmission or at the start of reception. However, depending on the use environment, the multipath check may be performed only when the transmission / reception method of the present invention is installed. Alternatively, it may be performed when the user feels necessary from the reception status.
[0045]
(Example 5)
An actual antenna arrangement and a system configuration example are shown. FIG. 8A shows an example in which the direction of the directional antenna is evaluated by the above-described method at the start of transmission or at the start of reception, and the direction of the antenna is determined. An appropriate antenna direction is selected by manually changing the direction of the antenna 711 and notifying the antenna direction with light, sound, or the like in the case of the favorable antenna direction 701. Of course, the antenna may be driven automatically.
[0046]
FIG. 8B is a similar example using the phased array antenna 712. Since there are no moving parts, the direction can be changed at a very high speed.
[0047]
FIG. 8C shows an example in which a plurality of directional antennas are evaluated by the above-described method, and directions 701, 702, 703, and 704 are switched and used by using the methods of the third and fourth embodiments. This is equivalent to angle diversity. More preferably, it is most efficient if the individual antennas are movable as shown in FIG. 8 (a) and can be mutually selected after facing a preferred direction.
[0048]
FIG. 8D shows a similar example in position diversity. In the case of a millimeter wave, a fatal reception disturbance is caused by shadowing (mainly by a human body), so that the combination with the angle diversity as shown in FIG. 8E is more effective. Because, in many cases, a plurality of transmitters are arranged relatively above, basically a direct wave is selected and received, but if antennas are installed at both ends of the receiving device, a device of a certain size can be obtained. If so, it is unlikely that the human body covers all of the antennas arranged at the plurality of locations.
[0049]
FIG. 8F shows a similar example in frequency diversity. If there is enough frequency, transmitting at different frequencies from a plurality of locations (transmission directions 705 and 706) is very effective because fading due to interference between transmitters is reduced. In this case, on the receiving side, a plurality of antennas can be switched and received in the same manner. However, it is necessary to select a transmitter (transmission direction 705) that can receive with the same antenna 713 and receive without frequency and multipath. Is also possible.
[0050]
(Example 6)
FIG. 9 is an example in which the transmitter 801 is a multi-beam. The receiver 805 receives the radio wave from the transmission antenna 802, but has an obstacle 806 such as a metal locker that reflects the radio wave, and avoids a path 807 (dotted line) where a multipath occurs (the transmission antenna 803). By transmitting (not facing the direction of the obstacle 806), stable operation of the system is possible. Further, it is possible to transmit to a receiver 809 outside the line of sight by transmitting the signal with the antenna 804 while avoiding the obstacle 808 of the radio wave. In this case, if there is no directivity, many multipath paths occur at the obstacle 808, and there is a possibility that the reception of the receiver 805 may be impaired, so that directivity is important.
[0051]
(Example 7)
FIG. 10 shows an example in which a plurality of transmitters are arranged and a plurality of paths from different angles, and reception obstacles due to shadowing are actively avoided. Here, instead of placing a plurality of transmitters, a signal is transmitted from the transmitter 901 to the repeater 902 using the directional antenna 903, and the repeater 902 relays the signal to the receiver using the transmission / reception antenna 904. A route 905 from the transmitter 901 and a route 906 from the repeater 902 are positively configured. This is a very effective method for avoiding shadowing and increasing the reliability of communication, and also increases the possibility of reception failure due to undesired multipath. It is very important to evaluate whether or not.
[0052]
【The invention's effect】
According to the method of the present invention, a diversity circuit for each channel is not required, and a plurality of channels can be selected and received from a processed signal using an ordinary receiver, or a plurality of receivers can be connected. It becomes possible to receive different channels.
[0053]
Further, since the information of the modulation scheme of the transmission signal, the channel interval, the band of each channel, and other information of the transmission scheme is not necessary for the diversity circuit, simultaneous reception is possible even for a signal in which a plurality of transmission schemes are mixed.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a wireless transmission / reception method according to a first embodiment of the present invention.
FIG. 2 is a diagram illustrating a method of selecting an optimum transmission / reception path in the wireless transmission / reception method according to the first embodiment of the present invention.
FIG. 3 is a diagram illustrating a wireless transmission / reception method according to a second embodiment of the present invention.
FIG. 4 is a diagram illustrating a signal frequency band to be transmitted according to a second embodiment of the present invention.
FIG. 5 is a diagram illustrating a wireless transmission / reception method according to a third embodiment of the present invention.
FIG. 6 is a diagram illustrating a wireless transmission / reception method according to a fourth embodiment of the present invention.
FIG. 7 is a diagram illustrating a wireless transmission / reception method according to a fourth embodiment of the present invention.
FIG. 8 is a diagram illustrating a wireless transmission / reception method according to a fifth embodiment of the present invention.
FIG. 9 is a diagram illustrating a wireless transmission / reception method according to a sixth embodiment of the present invention.
FIG. 10 is a diagram illustrating a wireless transmission / reception method according to a seventh embodiment of the present invention.
FIG. 11 is a diagram illustrating a conventional wireless transmission / reception method.
[Explanation of symbols]
101, 201, 301, 501 Transmitting antennas 102, 103, 104 Receiving antennas 202, 203, 204 Receiving antennas 302, 303, 304 Receiving antennas 502, 503, 504 Receiving antennas 105, 206, 306, 507 Ultra wideband signals 106, 107 , 108 received signals 208, 210, 212 received signals 308, 310, 312 received signals 601, 602, 603, 605, 606, 607 received signals 205, 305, 604, 608 reference signals 207, 209, 211, 307, 309, 311, 608 Received reference signal 231 Receiving antenna 232 RF amplifier 233 Local oscillator 234 Mixer 235, 236 Filter 237 Reference signal comparison circuit 238 Switch 239 IF signal output terminal 401 Signal frequency band 402 Sweeper 505 Spectral information in band signals 506 Band signals 508, 510, 512 Received reference signals 509, 511, 513 Received band signals 701, 702, 703, 704 Antenna directions 711, 713 Antenna 712 Phase array antenna 705, 706 Transmission direction 801 Transmitters 802, 803, 804 Transmission antenna 805 Receiver 806, 808 Obstacle 807 Path where multipath occurs 809 Receiver 901 Transmitter 902 Repeater 903 Directional antenna 904 Transmission / reception antenna 905, 906 Path

Claims (16)

In a wireless transmitting and receiving method capable of transmitting and receiving a wideband signal including multiple channels between a transmitter and a receiver having a receiving antenna via a plurality of paths,
A wireless transmission and reception method for selecting a non-overlapping path on which a wideband signal is not superimposed by multipath,
A transmission step of transmitting a plurality of reference signals having different frequencies outside the frequency of the wideband signal and inserting the plurality of reference signals having the same signal strength into the wideband signal,
A first selection step of receiving the plurality of reference signals via the plurality of paths and selecting a path having a small difference in reception intensity between the reference signals as a non-overlapping path. In a wireless transmitting and receiving method capable of transmitting and receiving a wideband signal including multiple channels between a transmitter and a receiver having a receiving antenna via a plurality of paths,
A wireless transmission and reception method for selecting a non-overlapping path on which a wideband signal is not superimposed by multipath,
A transmission step of inserting a reference signal having a constant signal strength different in frequency from the wideband signal, obtained by frequency sweeping, into the wideband signal and transmitting the signal,
Receiving the reference signal obtained by frequency sweeping via the plurality of paths, and selecting a path having a small reception intensity difference in the reference signal as a non-overlapping path. Characteristic wireless transmission and reception method. In a wireless transmitting and receiving method capable of transmitting and receiving a wideband signal including multiple channels between a transmitter and a receiver having a receiving antenna via a plurality of paths,
A wireless transmission and reception method for selecting a non-overlapping path on which a wideband signal is not superimposed by multipath,
A transmission step of adding spectral information having a different frequency from the wideband signal, including the strength information of the wideband signal, and adding and transmitting the spectrum information as a reference signal to the wideband signal,
A first selection step of receiving spectrum information as a reference signal via the plurality of paths and selecting a path having a small difference between the reception intensity distribution of the wideband signal and the spectrum information as a non-overlapping path. Wireless transmission and reception method. The wireless transmission / reception method according to any one of claims 1 to 3, wherein the wideband signal is a millimeter-wave band signal. When a plurality of non-overlapping routes are selected in the first selection step,
The wireless transmission / reception method according to any one of claims 1 to 3, further comprising a second selection step of selecting, from among the plurality of non-overlapping paths, a path having the highest reception intensity of the reference signal. At the start of reception, the first selection step is performed to select a plurality of non-overlapping paths,
The wireless transmission / reception method according to claim 5, wherein the second selection step is set so as to be performed at regular intervals thereafter. 4. The radio transmission / reception method according to claim 1, wherein the reception antenna is a movable directional antenna, and receives a wideband signal from a plurality of paths by changing a direction of the antenna. . The wireless transmitting / receiving method according to any one of claims 1 to 3, wherein the receiving antenna is a phase array antenna, and a wideband signal is received from a plurality of paths by changing the directivity of the antenna. The reception antenna includes a plurality of directional antennas facing different directions, and switches an antenna used for reception, thereby receiving a wideband signal from a plurality of paths. The wireless transmission / reception method according to 1. The reception antenna according to any one of claims 1 to 3, wherein the reception antenna includes a plurality of antennas arranged at different positions from each other, and switches an antenna used for reception to receive a wideband signal from a plurality of paths. The wireless transmission / reception method as described. The wireless transmitting / receiving method according to any one of claims 1 to 3, wherein the transmitter transmits a plurality of wideband signals having different frequencies to the receiving antenna from different directions. The wireless transmission / reception method according to any one of claims 1 to 3, wherein a wideband signal is transmitted by a plurality of directional antennas provided in the transmitter. The wireless transmission / reception method according to any one of claims 1 to 3, wherein the wideband signal is transmitted on a plurality of paths by a plurality of transmitters or by a transmitter and a repeater. In a wireless transmitting and receiving system capable of transmitting and receiving a wideband signal including multiple channels between a transmitter and a receiver having a receiving antenna via a plurality of paths,
A wireless transmission / reception system that selects a non-overlapping path on which a wideband signal is not superimposed by multipath,
The transmitter has a different frequency from each other, a plurality of reference signals having the same signal strength is set to be inserted into the wideband signal and transmitted,
The receiver is configured to receive the plurality of reference signals via the plurality of paths, and to select a path having a small reception intensity difference between the reference signals as a non-overlapping path. Transmission / reception system. In a wireless transmitting and receiving system capable of transmitting and receiving a wideband signal including multiple channels between a transmitter and a receiver having a receiving antenna via a plurality of paths,
A wireless transmission / reception system that selects a non-overlapping path on which a wideband signal is not superimposed by multipath,
The transmitter is set to insert a reference signal having a constant signal strength obtained by frequency sweep into the wideband signal and transmit the signal.
The receiver is configured to receive the reference signal obtained by frequency sweeping through the plurality of paths, and to select a path having a small reception intensity difference in the reference signal as a non-overlapping path. A wireless transmission / reception system, comprising: In a wireless transmitting and receiving system capable of transmitting and receiving a wideband signal including multiple channels between a transmitter and a receiver having a receiving antenna via a plurality of paths,
A wireless transmission / reception system that selects a non-overlapping path on which a wideband signal is not superimposed by multipath,
The transmitter, including the strength information of the broadband signal, the broadband signal and the spectral information different in frequency, is set to be added to the wideband signal as a reference signal and transmitted,
The receiver is configured to receive spectrum information as a reference signal via the plurality of paths, and to select a path having a small difference between the reception intensity distribution of the wideband signal and the spectrum information as a non-overlapping path. Wireless transmission and reception system.

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