JPH088807A - Multi-channel mobile radio repeater - Google Patents

Abstract

PURPOSE:To provide the multi-channel mobile radio repeater in which a narrow band of a required communication channel is selected and relayed and the communication service with a wide range is available while suppressing relaying other radio waves than an object radio wave and spurious radiation. CONSTITUTION:In the repeater relaying data without frequency conversion through a mobile radio channel adopting the multi-channel 2-frequency duplex operation system, amplifier devices are formed in two-way via band pass filters 33, 34, 39, 40 for each communication band of the duplex operation system, where plural narrow band pass filters 36a-36h, 42a-42h are used to discriminate plural high frequency communication channels and each discriminated output is amplified by separate exclusive amplifiers 37a-37h, 43a-43h and outputs from the amplifiers are combined by combiners each comprising narrow band pass filters 38a-38h (44a-44h).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile radio circuit of a multi-channel dual frequency recovery system, and in a relay device for relaying without converting the frequency, the radio wave of a base radio station obstructs communication due to radio wave shielding. The present invention relates to a multi-channel mobile radio relay device that enables communication between regions and places without increasing radio allocation.

[0002]

2. Description of the Related Art Conventionally, in a mobile radio system of VHF band and UHF band, a relay device which amplifies and relays a high frequency channel of a base station as it is has been implemented in a road tunnel or the like.

The conventional relay device is designed to relay all the bands including the upstream frequency and the downstream frequency at once, and therefore it is easy to relay the unwanted wave which is not the purpose, and when relaying a large number of channels, Interfering waves are easily generated by unwanted waves created in. For this reason, it has been difficult to economically increase the transmission output for the service area, and it has been difficult to service a wide mobile communication area.

[0004]

In the relay device, since the antenna for transmitting and receiving radio waves to and from the master station and the antenna for transmitting and receiving radio waves to and from the mobile station are arranged at a short distance, the frequency is converted. However, if the relaying method is used, the coupling between the input and the output becomes relatively large, and there is a problem that abnormal oscillation easily occurs.

Further, since the conventional relay apparatus is constructed so that the amplifier for amplifying each radio communication channel to the required electric power collectively amplifies a predetermined band, it requires a large electric power performance and has a high electric power capability. It is used exclusively to cover a small enclosed space area such as a tunnel due to its limitations. Also, to relay and amplify all radio waves in the band,
Radio waves other than the intended one may be relayed, and the distorted wave component generated due to the effect of strong radio waves in the closer band may cause interference in the communication channel.

The present invention has been made in view of the above circumstances, and it is possible to significantly reduce the coupling between input and output to reliably prevent abnormal oscillation, and to reduce a narrow band near a required communication channel. It is an object of the present invention to provide a multi-channel mobile radio relay device that can be selectively relayed, suppresses the relay of undesired radio waves and the emission of unnecessary waves and enables a wide range of communication services.

[0007]

According to a first aspect of the present invention, in a mobile radio circuit of a multi-channel dual frequency recovery system, a relay device for relaying without converting the frequency transmits and receives radio waves to and from a master station. A parent antenna, an area antenna for transmitting and receiving radio waves to and from a mobile station, a bidirectional relay amplifier provided between the parent antenna and the area antenna for amplifying a transmission / reception signal, and the parent antenna A first sensor antenna provided close to the antenna,
The second sensor antenna provided close to the area antenna and the level of the radiated radio waves from the area antenna and the second sensor antenna received by the parent antenna and the first sensor antenna are level-adjusted and reverse. First coupling means for phase-combining and coupling to the relay amplifier, and level adjustments of radiated radio waves from the parent antenna and the first sensor antenna received by the area antenna and the second sensor antenna, and reverse. Second coupling means for phase-combining and coupling to the relay amplifier is provided.

A second aspect of the present invention is a mobile radio line of a multi-channel dual-frequency recovery system, which is a relay device for performing a relay without converting a frequency. A band-pass filter separates each of these separated outputs with a separate dedicated amplifier, and the output of each amplifier is combined with a narrow-band filter type combiner. It is characterized by being configured bidirectionally.

[0009]

[Action]

(First Invention) The radio wave fd for the mobile station radiated in the air from the master station is received by the master antenna of the relay device, amplified by the relay amplifier, and then transmitted to the mobile station from the area antenna. Also, the radio wave fu from the mobile station to the parent station
Follows the reverse route and is transmitted to the master station.

The radio wave fd directed to the mobile station relayed by the relay device is radiated from the front surface of the area antenna, but is also attenuated from the rear of the area antenna. Further, the radio wave fd for the mobile station is also radiated from the second sensor antenna. The radio wave fd for the mobile station, which is radiated from the area antenna and the second sensor antenna, is received by the master station antenna, and
Is received by the sensor antenna of. The radio wave fd received by the parent antenna and the first sensor antenna is
After the level is adjusted by the first coupling means, it is subjected to anti-phase synthesis and undergoes great attenuation.

The radio wave fu from the mobile station relayed by the relay device to the master station is radiated from the master antenna to the master station, but is also radiated from the rear side as in the case described above. . Then, what is radiated from the parent antenna and the first sensor antenna is received by the area antenna and the second sensor antenna, the level is adjusted by the second coupling means, and then the reverse phase combination is performed to make a large amount. Undergo decay.

As described above, the amount of coupling attenuation between the parent antenna and the area antenna is significantly improved, and abnormal oscillation due to coupling between the input and output of the repeater is suppressed,
It enables stable relay of the same wave.

(Second Invention) A repeater comprises an amplifying device composed of a plurality of narrow band filters, a dedicated amplifier, and a narrow band filter type combiner, and narrows high frequency channels requiring relay in the communication allocation band. It is demultiplexed by a bandpass filter and selectively amplified for multiple communication channels.

The narrow band filter on the input side of the amplifying device has a function of preventing a multi-frequency signal that causes an increase in intermodulation action from being input to the amplifier, and the narrow band filter on the output side is generated by the intermodulation action. Suppress unwanted unwanted waves.

The maximum power of the amplifier output can be increased by the effect of suppressing the unwanted wave due to the intermodulation. For example, when the used bandwidth is 10 MHz and the amplification bandwidth is 100 kHz, it is possible to obtain a power capacity about 100 times that of the related art.

By increasing / decreasing the amplification level of the amplifier according to the input level from the master station, it is possible to adjust the deviation of the loss between the master station and the relay point, and all channels can be distributed to the area with uniform power. Can be supplied.

[0017]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall system configuration diagram of a multi-channel mobile radio relay device according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 is a master station (base station), 2 is a relay device, and 3 is a mobile station mounted in an automobile or the like. The relay device 2 includes a parent antenna 11 using a parabolic antenna or the like for the master station 1 and an area antenna 12 using a corner antenna or the like for the mobile station 3, and also includes the parent antenna 11 and the area antenna 12. A first sensor antenna 13 and a second sensor antenna 14 are provided on the back surface so as to face each other. The sensor antennas 13 and 14 use antennas having a very small gain and good F / B (front / back) characteristics. The parent antenna 11 and the first sensor antenna 13 are connected to the bidirectional relay amplifier 16 via the coupler 15. When only the signal received by the parent antenna 11 is input to the coupler 15,
The input signal is output to the relay amplifier 16 as it is, but when the parent antenna 11 and the first sensor antenna 13 receive the same radio wave, they are configured so as to be inversely phase-combined and largely attenuated. Details will be described later.

The area antenna 12 and the second sensor antenna 14 are connected to a relay amplifier 16 via a coupler 17. The combiner 17 is the combiner 15
It has the same function as. The relay amplifier 16 is configured so as to be selectively amplified and combined by a plurality of narrow band filter added amplifiers, and details thereof will be described later. A monitoring control interface 18 is connected to the relay amplifier 16, and the monitoring control interface 18 is
The terminal 19 is connected via a communication cable to a monitor control device (not shown) arranged in a monitor center or the like.
This monitoring control device performs monitoring / control of the relay device 2 and ON / OFF control of the power supply.

In the above configuration, the radio wave fd radiated from the master station 1 into the air is the antenna 11 for the master of the relay device 2.
After being received by, the signal is received by, is amplified by the relay amplifier 16 via the combiner 15, is supplied to the area antenna 12 via the combiner 17, and is transmitted from the area antenna 12 to the mobile station 3.

Further, the radio wave fu from the mobile station 3 follows the reverse route and is transmitted to the master station 1. That is, the radio wave fu from the mobile station 3 is received by the area antenna 12 of the relay device 2, amplified by the relay amplifier 16 via the coupler 17, and then supplied to the parent antenna 11 via the coupler 15.
This is transmitted to the parent station 1 from the parent antenna 11.

The radio wave fd for the mobile station relayed by the relay device 2 is radiated from the front surface of the area-oriented antenna 12, but is also attenuated from the rear side. Further, the radio wave fd for the mobile station is also radiated from the second sensor antenna 14 toward the parent antenna 11. The radio wave fd directed to the mobile station, which is radiated backward from the area antenna 12 is received by the master station antenna 11 and the first sensor antenna 13. The radio waves fd received by the parent antenna 11 and the first sensor antenna 13 are adjusted in level by the coupler 15 and then subjected to reverse phase synthesis to be greatly attenuated. Further, the radio wave fd for the mobile station radiated from the second sensor antenna 14 is also received by the master station antenna 11, and at the same time the first sensor antenna 1
The signal is received at 3 and the level is adjusted by the combiner 15, and then the signals are subjected to anti-phase synthesis and undergo a large attenuation.

The radio waves radiated from the area-oriented antenna 12 and the second sensor antenna 14 in the direction of the parent antenna 11 as described above are the parent antenna 11 and the first antenna 11.
Although it is received by the sensor antenna 13 of FIG. As a result, the attenuation of the radio wave fd between the input and output of the relay amplifier 16 exceeds the amplifier gain, and the relay device 2 operates stably.

The radio wave fu for the master station relayed by the relay device 2 is radiated from the master antenna 11 to the master station 1, but leaks backward from the master antenna 11 as in the above case. The antenna and the antenna radiated from the first sensor antenna 13 are received by the area antenna 12 and the second sensor antenna 14, and are level-adjusted by the coupler 17, and then are anti-phase combined to cause a large attenuation. It is received and hardly input to the relay amplifier 16. As a result, a stable relay operation is performed even when the relay device 2 and the radio wave fu are attached.

FIG. 2 shows the configuration of the couplers 15 and 17. In FIG. 2, 21 is a connection terminal of the main antenna (parent antenna 11 or area antenna 12), and 22 is a connection terminal of the sensor antenna 13 or 14. Reference numeral 23 is a terminal to which the relay amplifier 16 is connected. Then, the coupling portion 24 is provided between the terminal 21 and the terminal 23. Further, the high frequency signal input to the terminal 22 is supplied to the attenuator 25 and the variable phase shifter 2 of approximately 180 °.
It is input to the coupling unit 24 via 6 and is grounded via the load resistor 27. The variable phase shifter 26 is adjusted so that the phase of the high frequency signal input to the terminal 22 is opposite to that of the high frequency signal input to the terminal 21. The load resistance 27 is an absorption resistance and contributes to stable operation.

In the above structure, when a signal is input only to the terminal 21, it is output as it is to the terminal 23 side via the coupler 24. When a signal is input to the terminal 23 side, the terminals 21 and 22 are connected via the coupler 24.
Is output to When signals are input to the terminals 21 and 22 at the same time, the level of the signal input to the terminal 22 is adjusted by the attenuator 25, and then the phase is inverted by the variable phase shifter 26 from the signal input from the terminal 21. The phases are adjusted and combined in the coupling unit 24. As a result, in the coupling unit 24, the signals combined at the same level and in the opposite phase are greatly attenuated,
Almost no output is made to the amplifier connection terminal 23.

Next, the configuration of the bidirectional relay amplifier 16 will be described with reference to FIG. In FIG. 3, 31 is an antenna terminal to which the parent antenna 11 is connected, and 32 is an antenna terminal to which the area antenna 12 is connected.

The high frequency signal for the mobile station input to the antenna terminal 31 is demultiplexed as a band (downstream frequency) for the mobile station by the band demultiplexing circuit constituted by the band filters 33 and 34, and is converted into thermal noise by the low noise amplifier 35. The ratio of is improved.

The signal amplified by the low noise amplifier 35 is selected through a narrow band filter 36a to 36h for a high frequency channel required for communication, and a power amplification dedicated amplifier 37a to 37h dedicated to each band selects a required power level. Is amplified up to. The signals amplified by the dedicated amplifiers 37a to 37h are combined by the combiner composed of the narrow band filters 38a to 38h and sent to the antenna terminal 32 without backflow by the band demultiplexing circuit composed of the band filters 39 and 40. To be

Further, the signal from the mobile station 3 to the master station 1 is input to the antenna terminal 32, demultiplexed as a band for the master station (uplink frequency) by the band filters 39 and 40, and the signal from the master station 1 is transmitted. It is separated and amplified by the low noise amplifier 41.

The signal amplified by the low noise amplifier 41 is selected by the narrow band filters 42a to 42h in the same manner as the signal for the mobile station, and amplified by the dedicated amplifiers 43a to 43h to the required power level. This dedicated amplifier 43a-
The signal amplified by 43h is the narrow band filter 44a.
The signals are combined by the combiner composed of .about.44h and sent to the antenna terminal 31 without backflow in the band branching circuit composed of the band filters 33 and 34.

FIG. 4 shows the narrow band filters 36a-36.
h, 42a to 42h, and narrow band filters 38a to 38.
4 shows the damping characteristics (solid line) of h and 44a to 44h. The broken line in FIG. 4 indicates a normal multi-stage BPF.
This shows the attenuation characteristics of the (band-pass filter), and has a very gentle selectivity characteristic.

The solid line shown in FIG. 5 is the narrow band filter 36a.
To 36h, dedicated amplifiers 37a to 37h, characteristics of a downlink frequency amplifier combining a combiner composed of narrow band filters 38a to 38h, and narrow band filters 42a to 42h,
Dedicated amplifiers 43a-43h, narrow band filters 44a-4
4 shows the characteristics of an upstream frequency amplifier in which a combiner composed of 4h is combined. The broken line in FIG. 5 shows the overall characteristics when a relay amplifier is configured by a normal multistage BPF and one amplifier.

As is apparent from FIG. 5, the characteristics of the relay amplifier 16 shown in FIG. 3 are very steep selectivity characteristics as compared with the characteristics of the multistage BPF and one amplifier. Has become.

As described above, the required frequency narrow band within the radio wave allocated band is demultiplexed by a filter having an extremely high selectivity, amplified, and then combined by a filter having a similar selectivity to double the selectivity characteristic. It is possible to prevent amplification of unnecessary frequencies that are close to each other.

In the relay amplifier 16 shown in detail in FIG. 3, the phases of the high frequencies input to the two adjacent amplification systems having the selected center frequencies, for example, the narrow band filters 36a and 36b are selected to be the same phase, and By arranging the frequency characteristics in the relationship of half voltage of the attenuation characteristic, the frequency characteristic of the required band can be flattened, and the radio wave outside the band can be greatly attenuated to prevent its relay.

In addition, in the relay amplifier 16, by selecting the phase difference of the high frequencies input to the two adjacent amplification systems of the selected center frequency, for example, the narrow band filters 36a and 36b to 180 °, it becomes unnecessary. The function of preventing relay of radio waves can be enhanced. That is, by selecting the phase difference of the high frequencies input to the two adjacent amplification systems of the selected center frequency to be 180 °, unnecessary radio waves in the frequency region where the attenuation characteristics of each amplification system are superposed become a reverse phase and become large. Decay. This makes it possible to more reliably prevent unnecessary relaying of radio waves. For example, if there is an unnecessary radio wave between two adjacent selected center frequencies, by adopting such a method, the unnecessary radio wave can be reliably removed. The phase difference of the high frequencies input to the two adjacent amplification systems of the selected center frequency can be adjusted by the length of the cable, but may be adjusted by using a phase shifter.

[0038]

As described above in detail, according to the present invention, in a relay device which relays without converting the frequency in a mobile radio line of a multi-channel dual frequency recovery system, the coupling between the input and the output is significantly increased. It is possible to reliably prevent abnormal oscillation by reducing the number.

Further, by providing an amplifying device comprising a plurality of narrow band filters, a dedicated amplifier, and a narrow band filter type synthesizer, it is possible to select and relay a narrow band of a communication channel portion, and to relay an undesired radio wave. It suppresses the emission of unnecessary waves and enables a wide range of communication services. In addition, mobile radio stations that use base radio stations do not require changes in functions and operations, and at the same time do not change the system of base radio stations, and can communicate in areas where radio waves are blocked, such as buildings and shadows. Communication is possible or improved without allocating new radio waves.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of a multi-channel mobile radio relay device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing details of a coupler in FIG.

FIG. 3 is a block diagram showing details of a relay amplifier in the embodiment.

FIG. 4 is a single characteristic diagram of a narrow band filter and a narrow band filter type combiner in a relay amplifier.

FIG. 5 is a characteristic diagram of a combination of a narrow band filter, a dedicated amplifier and a narrow band filter type combiner in a relay amplifier.

[Explanation of symbols]

 1 Master Station 2 Relay Device 3 Mobile Station 11 Parent Antenna 12 Area Antenna 13 First Sensor Antenna 14 Second Sensor Antenna 15, 17 Coupler 16 Relay Amplifier 18 Monitoring and Control Interface 33, 34, 39, 40 Band Filter 35,41 Low noise amplifier 36a-36h, 42a-42h Narrow band filter 37a-37h, 43a-43h Dedicated amplifier 38a-38h, 44a-44h Narrow band filter

Claims (4)

[Claims] 1. In a relay device for relaying without converting the frequency in a mobile radio circuit of a multi-channel dual frequency recovery system, between a mobile station and a parent antenna for transmitting and receiving radio waves to and from a master station. An area antenna for transmitting and receiving radio waves, a bidirectional relay amplifier provided between the parent antenna and the area antenna for amplifying a transmission / reception signal, and a first antenna provided close to the parent antenna
Sensor antenna, a second sensor antenna provided close to the area antenna, and radiated radio waves from the area antenna and the second sensor antenna received by the parent antenna and the first sensor antenna. The radiated radio waves from the parent antenna and the first sensor antenna received by the area antenna and the second sensor antenna, which are adjusted in level and combined in reverse phase to be coupled to the relay amplifier, are received. A multi-channel mobile radio relay device comprising: second coupling means for level-adjusting, performing reverse phase synthesis, and coupling to the relay amplifier. 2. In a relay device for relaying without converting the frequency in a mobile radio circuit of a multi-channel dual frequency recovery system, a plurality of high frequency communication channels required for each relay direction are separated by a plurality of narrow band filters. Then, each of these separated outputs is amplified by a separate dedicated amplifier, and the output of each amplifier is combined by a narrow-band filter type synthesizer to construct an amplification device bidirectionally via band filters for each communication band of the restoration method. A multi-channel mobile radio relay device characterized by the above. 3. The phase of the input high frequency is selected to be the same phase for two adjacent amplification systems of the selected center frequency in the amplification device, and the frequency characteristic of the required band is made flat. Item 2. A multi-channel mobile radio relay device according to item 2. 4. A specific unnecessary wave component existing in the pass band is set so that the phase difference of the input high frequencies is approximately 180 ° with respect to two adjacent amplification systems of the selected center frequency in the amplification device. The multi-channel mobile radio relay device according to claim 2, wherein