JPS63221724A - Radio repeater - Google Patents

Abstract

PURPOSE:To relay only plural desired channel signal at the same time with simple constitution by amplifying a reception signal separately by a band limit filter and an intermediate amplifier circuit for plural channels each after the signal is once converted into an intermediate frequency. CONSTITUTION:A reception section 12 and a transmission section 53 are arranged while existing a top of a hill inbetween, an intermediate frequency signal led out of the reception section 12 and a local oscillation signal used to generated the intermediate frequency are sent to a transmission section 53 by using a coaxial cable 40. In this case, the intermediate frequency signal in the transmission line is branched and distributed at a prescribed channel number by a distributer 74a, a branch signal branched by a branching device 74a is amplified separately by a band pass filter 74b and an intermediate frequency amplifier 74c, synthesized into one signal again by a synthesizer 74d and the result is sent to the transmission section 53. The transmission section 53 converts the signal into the same reception frequency again and radiates the signal again from an antenna 50.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Applications) The present invention relates to an automatic FI line live relay device that can simultaneously operate wireless relay using a single radio frequency (communication channel) for each of a plurality of communication channels. .

(Prior Art) Conventionally, radio relay equipment has been used as a means of relieving dead zones or expanding the communication range in wireless communication lines.
A two-wave relay system using the ii frequency is common, but there are also systems using a single radio frequency and multiplex radio systems.

In addition, there are two types of communication: the breath-talk method, in which the breath button is pressed when transmitting a call, and transmitting radio waves are only emitted during that time, and the simultaneous transmitting and receiving method, in which different frequencies are assigned to the sender and receiver, and radio waves are constantly emitted while talking. However, since most mobile communications are based on the BreathTalk method, this will be explained below as an example.

First, as shown in Figure 4, the two-frequency bidirectional relay system for the BreathTalk line allocates two waves with different frequencies for upstream and downstream transmission and reception, and relays the line in both directions. Yes, if you want to relay medium-channels, select -
After demodulating the El received signal, it is used as a modulation signal for the other transmitter, and a radio wave having a frequency different from that of the received radio wave is re-radiated.

When relaying multiple channels using this method, each channel is equipped with a transmitter/receiver, or the received wave is directly frequency-converted without demodulating the high frequency in the frequency band that includes the channel, and then amplified and radiated as +Ij.

The latter method is generally called a booster relay method and is used in television broadcast satellites and the like.

Condolences - The radio frequency two-way breathtalk line system is as follows:
For example, there is a two-way automatic repeater 1 which uses the same radio frequency of the Breathtalk line in Utility Application No. 41-11936 (Patent No. 815196) proposed by the present applicant. This method enables relaying of lines, and in this method, two sets of transmitters and receivers are placed on each side of a mountain or a building, etc., and each intermediate frequency signal is used to generate the intermediate frequency. After transmitting the received local oscillation signal to the other transmitter, the two are mixed again and the same frequency signal as the received wave is re-radiated via the transmitter.

According to this method, since the local oscillation signals of the transmitting and receiving devices are the same, even if the local oscillation frequency or the receiving frequency changes, the re-radiated radio waves will be exactly the same as the receiving frequency, and direct waves and relays will be mixed. There is no risk of beat failure even if the

In order to achieve multi-channel communication using this method, as in the case of the two-way radio frequency bidirectional breathtalk line method described above, a large number of single radio frequency bidirectional breathtalk line circuits are arranged to share antennas, etc. It is common to do so.

Multiplex wireless communication methods include FDM method, TDM method in AM, FM, SSB waves, etc., or T in PCM.
There are DM systems, and all of these systems use a bidirectional breathtalk line using a single or radio frequency.

Furthermore, in the simultaneous transmission/reception system (duplex system), relaying is performed using the various methods described above, but in this case, since the frequencies of each downlink line are different, one system of transmission/reception equipment is required for each frequency. , the device is even more complicated than the breath-talk method.

(Problems to be Solved by the Invention) However, the conventional wireless relay device as described above has various problems as described below.

first,? Since the radio frequency two-way pre-stoker line uses two different waves for transmission and reception, it is difficult to expand the number of radio waves in recent years, and in order to increase the number of channels, it is necessary to increase the number of channels depending on the number of channels. Since it requires a receiving section and a transmitting section, it has various economic and electrical problems such as an increase in the size of the equipment, a complicated circuit configuration, and an increase in power consumption.

In addition, since the single booster type amplifies and relays all signals within a wide band, it has the disadvantage of relaying not only radio waves other than the desired channel but also noise, so it can only be used in extremely limited areas or cases. .

In the Width-Radio Frequency bidirectional BreathDawg line system, there are no radio frequency problems caused by using two waves in the line, but when increasing the number of channels, it is not as economical as two radio and has electrical defects.

With multiplex communication, it is possible to send multiple signals in a superimposed manner using one transmission path, but the modulation circuit and demodulation circuit become complicated, the equipment becomes larger, and the facility cost increases significantly. It has the disadvantage that it is difficult to use with small-scale wireless lines.

These points similarly pose problems in relay devices in simultaneous transmission and reception lines.

(Object of the Invention) The present invention has been made in view of the above, and is a wireless relay using exactly the same frequency, which enables simultaneous operation of multiple channels, and further simplifies and downsizes the configuration circuit of the device. The purpose of the present invention is to provide a wireless relay device that has a simpler and more compact overall equipment configuration.

(Summary of the invention) In order to achieve this object, the present invention uses Yamawiki's T.
A transmitting device and a receiving device are placed across a structure such as an oil tower, a railway line, or a building, and the intermediate frequency signal derived from the receiving device and the local oscillation signal used to generate this intermediate frequency are transmitted using a coaxial cable or the like. When the intermediate frequency signal is transmitted to the transmitting device, the intermediate frequency signal is subjected to necessary amplification processing, mixed with the local oscillation signal recorded in rUi, and the same frequency signal as the signal input to the receiving device is extracted and amplified. In a relay device that re-radiates within a range that does not cause interference to the transmitting/receiving device using a commercial TI or a building as a shield, the intermediate frequency signal is branched and distributed to the required number of channels on the intermediate frequency signal transmission path. and a combiner for combining the branched signals into one signal again, and a bandpass filter having at least a required passband and an intermediate frequency amplifier are inserted into each branch channel of the distributor and combiner. Configure.

(Example) Hereinafter, the wireless relay device of the present invention will be explained in detail.

FIG. 1 is a block diagram showing an embodiment of the present invention applied to a bidirectional relay device for a Breathtalk line, and FIG. 2 is a block diagram showing an example of the structure of the transmitter and receiver in FIG. FIG. 3 is an explanatory diagram schematically showing the call status in the single radio bidirectional press talk line system of the present invention.

As shown in Fig. 1, this two-way radio relay device has a first block A and a second block B disposed on both sides of a mountain top, a tomb, or a building. It consists of a group of housed circuits and a coaxial cable that connects the two. The block body A has a matching device 11 connected to the antenna 10,
A receiving section 12 and a transmitting section 13 connected to the matching box 11, a DC amplifier 14 that detects and amplifies the received signal, and a D.
A switch circuit 1 that turns on and off the power supply to the transmitter 13 and the receiver of the block body B according to the received signal from the C amplifier 14.
5, and a power supply circuit 16 that supplies power to each part.

The other block B is composed of the same circuit as the block A. That is, the matching box 51 connected to the antenna 50
and the receiving device connected to the matching box 51, respectively. ! 652, the transmitter 53, and the DC amplifier 5 that detects and amplifies the received signal.
4, a switch circuit 55 that turns on and off the power supply to the transmitting section and the receiving section 53 of block body A according to the received signal from the DC amplifier 54, and a power supply circuit 56 that supplies power to each section.

The receiving section 12 and the transmitting section 13 in the block body A, and the receiving section 52 and the transmitting section 53 in the block body B each transmit the output of the receiving section to the other transmitting section, and one of them is provided in the block body A, for example. The outputs of the local oscillators are manually transmitted to the other block via coaxial cables 40, respectively.

The first block A and the second block B obtain the necessary communication range (service area), and the radio waves emitted from one transmitter via the antenna go around to the receiver of the other block. In order to prevent unstable operation, the topography and shape of buildings such as mountain tops, mountain ranges, and buildings should be considered when arranging them.

Next, the yarn path of the apparatus shown in FIG. 1 will be described in detail using FIG. 2. Note that the same parts as in FIG. 1 are given the same reference numerals, and redundant explanation will be omitted.

The receiving unit 12 includes a BPF (band pass filter) 70 whose pass band is only the frequency band to be relayed among the output signals of the matching box 11 connected to the antenna 10, and a high frequency amplification circuit 71 which amplifies the output without distortion. The high frequency amplification circuit 71
a mixing circuit 72 that mixes the output of the local oscillator 73 with the output of the local oscillator 73;
and a distributor 7 that distributes the mixed output to the required number of channels.
4a, a combiner 74d that combines the distributed channel signals into one signal again, and a band limiter that corresponds to each channel frequency and is compatible with the communication system between each channel of the distributor 74a and the combiner 74d. An IF-BPF (intermediate frequency band pass filter) 74b with a built-in filter and a saturation type intermediate frequency amplifier 74C having a sufficient amplification degree (for example, about 120 dB) are inserted and connected in series.

On the other hand, the transmitting section 53 of the blow block body B has a mixing circuit 81 which uses the local oscillation signal sent from the block body A as its own power.
, a BPF 82 having the same passing frequency as the reception frequency odd range among the mixed outputs, and a linear high frequency power amplifier 83 with little distortion are connected in series, and an intermediate signal transmitted from the block body A via the coaxial cable 40 is connected in series. A frequency signal is input to the other input terminal 40b of the mixing circuit 81, and the output of the high-frequency power amplifier 83 with excellent linearity is a 0 signal having the same frequency as the n1 desired signal received at block A and amplified to the required level. Katsura is obtained, and this is mixed into a mixer 51 and an antenna 50.
configured to re-radiate via.

Note that the intermediate frequency signal passing through the transmission line 40 is converted to an intermediate frequency lower than the received signal frequency to reduce loss on the transmission path to the other block. In addition, in order to prevent spurious reception during reception and to reduce transmission loss to the other block, the local oscillation frequency is oscillated at a low frequency and multiplied within each mixing circuit, [+ rpt
Convert to L intermediate frequency.

Each of these circuit sections operates as follows as a whole.

That is, the reception signal of the antenna 10 is converted into an intermediate frequency by the receiving section 12 of the block body A, and is transmitted to the block body B via a transmission line such as the coaxial cable 40, and then transmitted to the block body B by the transmitting section 5.
In the apparatus of the present invention, the signal frequency of the mixing local oscillation circuit 73 of the receiving section 12 is also used in the transmitting section 53. Therefore, the same conversion frequency can be obtained. Therefore, the local oscillation frequency circuit 73
Even if the oscillation frequency changes due to the temperature or aging of the crystal oscillator used in This has the advantage that no beat sound is generated, and the signal frequency passing through the transmission line 40 is converted to an intermediate frequency lower than the received signal frequency, reducing transmission loss in the transmission line 40. This is as mentioned above.

In the above operation explanation, the relay operation from the block pair A to the block pair B direction has been described, but the operation is exactly the same in the opposite direction. However, when relaying on the same frequency for each channel as in this embodiment, if the transmitting section of the same block operates while the receiver section is operating, the relay operation will be interrupted due to the transmission waves going around to the receiving section. There is a possibility that it will become stable.

Therefore, it is desirable that one of the transmitting and receiving units is configured to stop the operation of the other block in the same block while it is in operation.

Various methods can be considered for the f-stage for this purpose, but for example, when the desired wave signal is input to the receiving section, the limiter current of the intermediate wave amplifier circuit is detected and the power supply to the transmitting section of the same block is stopped. Preferably, this operation is performed by the DC amplifier 14.54 and the switch circuit 15.55 provided in each block, and at the same time, in the other block, the transmitter is in operation by checking its current consumption or transmitting. It is detected by DC voltage etc. obtained by rectifying a part of the radio wave, and the operation of the receiver (3 parts) of the same block is stopped.

Another method is to operate only the receiving sections of both blocks in the relay standby state, and monitor the limiter current, the intermediate frequency signal level, or the noise level inside and outside the voice band.
Based on the so-called carrier squelch and noise squelch functions, the transmitter of the other block is activated and the receiver's function is activated.
Stop @.

Since these means are techniques generally used in conventional relay devices, a detailed explanation 1j thereof will be omitted.

FIG. 3 is a schematic diagram showing the aspect of transmission and reception using the single radio frequency bidirectional Breasttalk line system of the present invention, in which blocks are placed on both sides of a mountaintop, a high-rise building, etc. as a shield, and , both block bodies are connected by a coaxial cable 40. In this case, if the cable is buried underground at the top of a mountain, etc., it will prevent heat, lightning, high frequency, etc.
It is possible to prevent waves from entering the cable 40 and superimposing them.

According to experiments, depending on the frequency used, for example, depending on the frequency used, depending on the narrow arrangement of mountain peaks or tomb lines, for example, in the VHF band,
A wrap-around attenuation of about 150 dB can be easily obtained. Furthermore, if the minimum operating input level of the high frequency amplifier or intermediate frequency amplifier is set high, that amount can be added to the loop attenuation amount, so the level diagram can be adjusted as appropriate depending on the incoming level of the relay wave. Just design it.

According to this relay device, it is possible to carry out wireless relay using exactly the same frequency for each of a plurality of preset channels.

In the embodiments detailed above, a bidirectional relay device is illustrated, but the present invention is not limited to this example, and various modifications can be made to the operational form and device configuration.

For example, in broadcast communication, only one-way relay is required, so each block only needs to be equipped with a transmitting device or a C receiving device.

Furthermore, if different frequencies can be used in uplink and downlink lines, there is no need to use structures such as mountain peaks or buildings as shielding objects, so they can be set up on the same support.

Furthermore, when the communication method is a simultaneous transmission and reception method, in a relay device having almost the same configuration as that shown in FIGS. 1 to 3,
If the channel frequencies of the upper and lower lines match each line of the communication system and are modified so that the transmitting and receiving parts of each block can operate simultaneously, it is easy to relay at exactly the same frequency as each line frequency. I can understand it.

Also, various modifications can be made to the arrangement.

For example, an intermediate frequency circuit is divided into multiple stages, and some of them are
It is also possible to separately arrange the other parts in the block body and the B block body, and connect these with the same number of coaxial cables as the number of channels.This may be done as appropriate depending on the conditions. It is a thing.

This is to improve the S/N ratio by amplifying the intermediate frequency signal to a required level within the A block, taking into account the transmission loss of the connecting coaxial cable.

Furthermore, the relay device of the present invention is not limited to mountains, etc., but can be used in large cities, for example, by arranging block bodies A and B on both sides of the building and connecting them with a coaxial cable, using a high-rise building in a city area as a shield. It is possible to relieve dead zones in various communication lines between high-rise buildings.

Additionally, if the transmission path between blocks A and B becomes long and this loss increases, the loss can be significantly reduced by using an optical fiber as the transmission cable between blocks and using optical fiber5) as the intermediate frequency signal. sell.

(Effects of the Invention) As explained above, the present invention transmits received signals to one station KB.
Since it is configured to convert the oscillation signal into a -U intermediate frequency and then separate and amplify it for each of multiple channels using a band-limiting filter and an intermediate amplifier circuit, only multiple desired channel signals can be relayed at the same time with an extremely IPim configuration. This is called 1-1j moat.

In particular, if applied to the method proposed by the same applicant that relays at exactly the same frequency as the received signal, it will be possible to effectively use radio waves without causing beat interference even when both direct waves and relay waves exist. The relay system, which is very convenient for Toshikawa, can be made available for multiple channels at the same time.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the overall configuration of an embodiment of the present invention, Fig. 2 is a block diagram showing one path of the receiving and transmitting parts in Fig. 1, and Fig. 3 is a bidirectional diagram of a single radio frequency. A schematic diagram showing the mode of transmission and reception using the BreathTalk line system, Figure 4 shows the conventional 2-no! FIG. 2 is an explanatory diagram of a transmission/reception mode using a bidirectional breathtalk line system with an IJ wave number. Code 10 - φ antenna 11@-- matching box 12, - φ receiving section 13... transmitting section 14, -- DC#9 width switch 15-... switch circuit 16
・-Power supply circuit 40---Coaxial cable 4 Q aa
#e Output end 40b---Input end 50・a#Antenna
51@... Matching box 52... Receiving section 53
... Transmission section 54 --- DC amplifier 55 Φ switch circuit 70 -- BPF (band number bus filter) 7
1. Proboscis high frequency circuit 72...Mixing circuit 73.-轡local oscillation circuit 74..Fist intermediate frequency amplification circuit 74a*.
・Distributor 74b...BPF 74c...Amplifier 74d・Synthesizer 82...BPF 83...
′Ton force amplifier patent applicant Toyo Tsushinki Co., Ltd. Antenna Giken Co., Ltd.

Claims (4)

[Claims] (1) A transmitting device and a receiving device are placed opposite each other across a structure such as a mountain top, a mountain range, or a building, and the intermediate frequency signal derived from the receiving device and the local oscillation signal used to generate the intermediate frequency signal are generated. is transmitted to the transmitting device via a coaxial cable or the like, and the intermediate frequency signal and the local oscillation signal are mixed to extract the same frequency signal as the signal input to the receiving device. Alternatively, in a repeating device that re-radiates within a level range that does not cause interference between transmitting and receiving devices using a building or the like as a shield, the intermediate frequency signal is distributed into the required number of channels in the intermediate frequency signal transmission path. and a combiner for combining the branched signals into one signal again, and further comprising a bandpass filter having at least a required passband and an intermediate frequency amplifier inserted in each of the channels. Device. (2) By arranging the two systems of wireless relay devices opposite to each other and stopping the operation of the receiving device attached to it when one of the transmitting devices operates, it is possible to perform both upstream and downstream wireless relays. 2. The wireless relay device according to claim 1, wherein the wireless relay device is adapted to be used. (3) Claims 1 and 2 are characterized in that by providing separate local oscillators in each of the transmitting device and the receiving device, there is no need for means for transmitting a local oscillation signal from one to the other. The wireless relay device described. (4) A patent characterized in that the local oscillation signal frequency of each of the transmitting and receiving devices is made different so that the receiving wave frequency and the transmitting wave frequency are made different, thereby eliminating the need for shielding the mountain or building, etc. A wireless relay device according to claims 1 to 3.