KR20160112917A

KR20160112917A - Hybrid line amplifier

Info

Publication number: KR20160112917A
Application number: KR1020150156018A
Authority: KR
Inventors: 백홍배
Original assignee: 블루넷테크놀러지 주식회사
Priority date: 2015-03-18
Filing date: 2015-11-06
Publication date: 2016-09-28
Also published as: KR101687354B1

Abstract

The present invention relates to an FM, terrestrial DMB, and wireless communication hybrid line amplifying apparatus for fire fighting. According to the present invention, it is possible to provide an FM radio broadcasting, It is possible to listen to the terrestrial DMB broadcasting and make the radio communication of the fire fighters utilizing the radio frequency UHF band frequency of the fire.

Description

FM, terrestrial DMB and wireless communication hybrid line amplifier

The present invention relates to an FM, a terrestrial DMB, and a wireless communication hybrid line amplifying apparatus for a fire, and is installed in an underground or a shaded area to sufficiently compensate for loss of a coaxial cable and an antenna to listen to FM radio broadcasting and terrestrial DMB broadcasting And to enable wireless communication of firefighters by utilizing the UHF band frequency of the fire-fighting wireless communication.

In many cases, it is impossible to listen to FM radio, terrestrial DMB, etc. in the interior or underground space of large buildings. In addition, radio communication between the inside and outside of the building is limited.

For this, leakage coaxial cables and antennas are installed in the building to listen to FM and DMB broadcasts and enable communication of firewaves. However, due to coupling loss and attenuation characteristics of coaxial cables, there is a problem in long distance transmission. In addition, a line amplifier is used to amplify a weak signal. In the conventional line amplifier, since the gain is low, the number of the line amplifiers is increased, and each module is composed of each module, which causes a size increase and a cost increase.

Conventionally, a diplexer type short-wave bidirectional amplifier is generally used. That is, when transmission and reception are performed using the same frequency, isolation between the transmission and reception of the duplexer is ensured so that the RF signal power is not fed back to the reception amplifier side in the operation of the transmission amplifier.

However, the original duplexer uses different transmission and reception frequencies, not the same frequency, to ensure isolation between transmission and reception so that no feedback is made between the transmission and reception circuits.

As a result, this method is difficult to ensure isolation between the transmitting and receiving circuits, making amplification of 6 dB or more impossible, which makes it difficult to perform long-distance transmission. Therefore, since the installation interval of the amplifiers must be shortened to about 50 m, the installation cost must be increased.

In addition, since the low pass filter located at the front and the rear of the amplifier uses the passive elements 'L, C' in response to the seasonal changes in temperature and humidity, the gain of the amplifier is changed, There is an inconvenience that must be manually re-adjusted. It is also difficult to identify a failed amplifier in a multi-stage amplifier even in the event of a failure.

In the conventional power on-off type short-wave bidirectional repeater, the FM broadcast frequency (88 MHz to 108 MHz) is supplied to the power supply of the UHF down-amplifier at the time of standby and the UHF up-amplifier becomes cut off. In this case, when the radio wave is radiated from the ground radio, it is amplified by a fire-down amplifier and transmitted to the RF power side of the UHF band in the radio wave shadow region. When the radio wave is radiated in the radio wave shadow region, the RF level detector detects the RF power The downstream amplifier is cut off and the upstream amplifier power is supplied to transmit the RF signal to the ground. At this time, only one of the two amplifiers is operated in order to obtain the separation between the transmission and reception and the constant amplification.

Therefore, when a bidirectional line amplifier is installed in a multi-stage, power is supplied to the upstream amplifier and power supply to the downstream amplifier is stopped when RF power is detected in the bidirectional line amplifier installed at the center when the radio is radiated from the radio- . The RF signal is transmitted only to the upstream side, and wireless communication with the ground is performed. At this time, since the downstream amplifier is turned off, the signal level of the downstream amplifier in the next stage is weak and the amplifier is not operated. Therefore, for smooth wireless communication, it is necessary to install the amplifiers at intervals of 30m or less, and the cost is increased, and it is also difficult to find a broken amplifier.

Further, in the duplexer system, since the gain of the amplifier is sensitive to changes in temperature and humidity, there is an inconvenience that the amplifier must be readjusted manually.

On the other hand, Korean Patent Laid-Open No. 10-2005-0082215 is known as a related art related to signal transmission in a radio wave shadow area.

Disclosure of the Invention The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide an FM radio broadcasting system and a terrestrial DMB broadcasting system capable of listening to FM radio broadcasting and terrestrial DMB broadcasting in a radio- And to provide a hybrid line amplification device which enables a firefighter to make a radio call using a wireless communication UHF band frequency.

According to an aspect of the present invention, there is provided an FM, terrestrial DMB, and fire fighting hybrid communication line amplifying apparatus including: an input unit for receiving and transmitting a radio signal; A bandpass distributor for passing and separating only a desired frequency band from a radio signal received through the input unit; An FM path unit for amplifying and outputting an FM radio broadcast signal in a radio signal passed through the bandpass distributor; A DMB path unit for amplifying and outputting a terrestrial DMB broadcasting signal from a radio signal passed through the bandpass distributor; A fire-fighting radio path unit for amplifying and outputting a fire-fighting radio signal from the radio signal passed through the band-pass distributor; A digital signal processor for digitally converting a radio signal passing through the FM path unit, the DMB path unit, and the fire radio path unit, thereby suppressing oscillation between channels by removing a feedback signal; A band pass combining unit for combining the amplified radio signals for each frequency band in the FM path unit, the DMB path unit, and the fire-fighting radio path unit; And an output unit for outputting a radio signal combined at the bandpass coupling unit to a radio wave shaded area.

The modem unit may further include a modem unit that remotely transmits the failure alarm, the signal alarm, and the DC voltage alarm signal through the FSK data, and receives the remote control signal.

The FM path unit includes an FM magnetic band filter unit 1 for passing only the FM radio broadcast band and filtering out signals of other bands from the radio signal received from the bandpass distributor; An FM low-pass transformer for converting the FM radio broadcast signal to a low frequency; An FM automatic gain controller for adjusting an amplification gain so that a signal having a predetermined amplitude is output regardless of an input size of the FM radio broadcast signal according to a control signal of the digital signal processor; An FM amplifier 1 for amplifying the FM radio broadcast signal to a signal level of a predetermined magnitude; An FM temperature compensation control unit for compensating for a signal reduced by the heat; An FM amplifier 2 for amplifying an FM radio broadcast signal amplified by a signal level of a predetermined magnitude in the FM amplifier 1 to a larger signal; An FM detection unit for changing the FM radio broadcast signal to a DC voltage; And an FM magnetic band filter unit 2 for passing only the FM radio broadcast band from the signal amplified by the FM amplifier unit 2. The path unit is configured to pass only the DMB radio broadcast band from the radio signal received from the band- A DMB magnetic band filter unit 1 for filtering signals of other bands; A DMB low-pass transformer for converting the terrestrial DMB signal into a low frequency signal; A DMB automatic gain controller for adjusting an amplification gain so that a signal of a predetermined size is output regardless of an input size of the terrestrial DMB signal according to a control signal of the digital signal processor; A DMB amplifier 1 for amplifying the terrestrial DMB signal to a signal level of a predetermined magnitude; A DMB temperature compensation controller for compensating a signal reduced by the heat; A DMB amplifying unit 2 for amplifying the terrestrial DMB signal amplified by the DMB amplifying unit 1 to a signal level of a predetermined magnitude to a larger signal; A DMB detecting unit for changing the terrestrial DMB signal to a DC voltage; And a DMB magnetic band filter unit 2 for passing only the DMB radio broadcasting band from the signal amplified by the DMB amplifying unit 2.

In addition, the fire-fighting radio path unit includes a fire-fighting radio-frequency band filter unit 1 for passing only a fire-fighting radio signal band from a signal received from the band-pass distributor and filtering signals of other frequency bands; A fire-fighting radio transmission unit 1 for transmitting a forward signal transmitted from the fire-fighting radio-frequency band filter unit 1 to a forward path side or a reverse-direction signal transmitted from a reverse path side to the fire-fighting radio- The forward path for amplifying the fire wireless forward signal and transmitting it to the propagation shadow area; The reverse path for amplifying and transmitting to the ground the fire reverse signal; (2) for transmitting a forward signal transmitted from the forward path side to the fire alarm wireless band filter unit (2) or transmitting a reverse signal transmitted from the fire alarm wireless band filter unit (2) to the reverse path side; And transmitting only the fire-fighting radio signal band in the signal amplified through the forward path to the band-pass combiner, passing only the fire-fighting radio signal band purely in the signal received from the band-pass combiner, And a fire wireless radio frequency band filter unit 2 for transmitting the signal to the fire-fighting radio transmission unit 2.

The FM, terrestrial DMB, and fire fighting hybrid communication line amplifying apparatus according to the present invention has the following effects.

It is not necessary to install additional equipment for digital broadcasting later by installing the line amplification device.

In addition, this line amplification device is modularized with One Board, which makes it possible to downsize and is easy to install.

In addition, it is possible to realize a high gain of more than 40 dB, so that the number of amplifiers to be installed can be minimized and the automatic gain control can be always performed at a constant output level regardless of the signal reception level. Environment can be provided.

In particular, in the digital signal processing unit, each frequency channel is digitally filtered, thereby reducing communication disturbances due to mutual spurious signals between channels, and preventing oscillation between channels by eliminating feedback signals.

In addition, the signal processing of the line amplifier can be digitized and the real time monitoring and control can be performed through the modem unit, so that maintenance of the facility is simple and operation cost can be greatly reduced.

In addition, according to the present invention, FM broadcasting, terrestrial DMB broadcasting, and fire-fighting radio signals are well relayed in a marginal area of a building, so that normal management radio communication and broadcasting can be performed. It is possible to listen to disaster broadcasting through FM / terrestrial DMB at the same time as it is used.

1 is a block diagram for explaining the overall configuration of an FM, terrestrial DMB, and fire fighting hybrid communication line amplification apparatus according to an embodiment of the present invention;
FIG. 2 is a block diagram for explaining a path of an FM signal and a DMB signal in the line amplifying apparatus shown in FIG. 1. FIG.
3 is a block diagram for explaining a path of a fire door line signal in the line amplification apparatus shown in FIG.
4 is a block diagram for explaining a digital signal processing unit in the line amplification apparatus shown in FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, some configurations which are not related to the gist of the present invention may be omitted or compressed, but the configurations omitted are not necessarily required for the present invention, and they may be combined by a person having ordinary skill in the art to which the present invention belongs. .

1 is a block diagram for explaining the overall configuration of an FM, terrestrial DMB, and fire fighting hybrid communication line amplifier according to an embodiment of the present invention. 1, a line amplification apparatus according to an embodiment of the present invention includes an input unit 11, an output unit 22, a bandpass distributor 12, a bandpass coupler 21, an FM path unit 100, a DMB path unit 200, a fire wireless path unit, a digital signal processing unit 400, and a modem unit 23. Such a line amplification apparatus is modular in its entirety, that is, it is fabricated as a One Board, and is installed on a coaxial cable in a ground or underground section.

The input unit 11 is provided for receiving radio signals of a single frequency and another frequency band. The input unit 11 receives the FM radio signal, the terrestrial DMB signal, and the fire prevention radio signal from the ground side, assuming that the left side in the drawing is the outside of the building or the ground direction, and the right side is a building interior or underground section that is a propagation shade area. That is, the input unit 11 receives a forward signal for amplification. In this case, it is necessary to transmit forward signals from the ground to the ground as well as reverse signals from the ground to the ground. Therefore, the input unit 11 also performs an output function of transmitting the reverse-direction fire signal amplified by the line amplifying device in the ground direction.

The bandpass distributor 12 is provided for separating and passing only a desired frequency band from a radio signal received through the input unit 11, that is, an analog signal. That is, the bandpass distributor 12 passes the frequency band corresponding to the FM radio signal, the terrestrial DMB signal, and the fire radio signal, and provides it to the FM path unit 100, the DMB path unit 200, and the fire radio path unit. In addition, the bandpass distributor 12 also performs a function of transferring a fire wireless signal amplified by the line amplifying device in the reverse direction (ground-directional ground) to the input unit 11 side.

The signal having passed through the bandpass distributor 12 is amplified while passing through the FM path unit 100, the DMB path unit 200 and the fire suppression path unit, and is amplified by a digital signal processor (DSP) The oscillation is eliminated by securing isolation. The FM path unit 100, the DMB path unit 200, the fire radio path unit, and the DSP 400 will be described later with reference to FIG. 2 through FIG.

The band-pass combining unit 21 is provided for combining the amplified radio signals in the respective paths without interfering with each other by frequency bands. The band-pass coupler 21 also combines signals from the modem 23 for remote transmission.

The output section 22 is provided for transmitting radio signals of a single frequency and another frequency band. In other words, the band-pass combining unit 21 transmits the combined radio signal in the direction of the propagation shade region. The output unit 22 also performs an input function for receiving a reverse fire signal from the radio wave shaded area side.

The modem unit 23 is provided for remotely transmitting the status of the apparatus or receiving a control signal from a remote unit to control the apparatus. The modem unit 23 transmits and receives signals such as a failure alarm, a signal alarm, and a DC voltage alarm using FSK data.

2 is a block diagram for explaining a path of an FM signal and a DMB signal in the line amplifying apparatus shown in FIG. 2, the FM path unit 100 includes an FM band filter unit 111, an FM band-pass filter unit 112, an FM automatic gain control unit 113, an FM amplifier unit 114, an FM A temperature compensation control unit 115, an FM amplification unit 116, an FM detection unit 117, and an FM band-pass filter unit 118. [ The DMB path unit 200 includes a DMB M band filter unit 211, a DMB low band transform unit 212, a DMB automatic gain control unit 213, a DMB amplification unit 214, a DMB temperature compensation control unit 215, A DMB amplification unit 216, a DMB detection unit 217, and a DMB magnetic band filter unit 218. Here, the FM radio signal and the terrestrial DMB signal are amplified while passing through a configuration having the same name on the FM path unit 100 and the DMB path unit 200, respectively, and then combined and output by the bandpass combining unit 21. [ Therefore, only the configuration of the FM path unit 100 will be described below, and the configuration of the FM path unit 100 is replaced with the description of the configuration of the DMB path unit 200 that processes the terrestrial DMB signal. In the FM path unit 100 and the DMB path unit 200, the names of the components that perform the same function are divided into 'FM' and 'DMB' for each path.

The FM magnetic-band filter unit 111 passes only the FM radio broadcast band from the signal received from the band-pass distributor 12, and filters out signals of other bands.

The FM down converter 112 converts the FM radio broadcast signal passed through the FM magnetic band filter unit 111 to a low frequency. This is to increase the speed of the digital signal processor 400. That is, the FM low-pass transformer 112 lowers the input signal to 70 MHz in hardware before applying the signal to the DSP 400. The signal input to the DSP 400 in this way is input to the IF down- And is used once again.

The FM automatic gain control unit 113 adjusts the amplification gain of the FM radio broadcast signal. At this time, the FM automatic gain control unit 113 receives the control signal from the digital signal processing unit 400 and adjusts the gain so that a signal of a predetermined size is output regardless of the input size of the FM radio broadcast signal.

The FM amplifier 1 114 amplifies the FM radio broadcast signal to a signal level of a predetermined magnitude.

The FM temperature compensation control unit 115 is provided to compensate for a signal reduced by the heat. In other words, when the device is continuously used and heat is generated, the signal can be reduced in size. By using a device whose resistance value changes according to the temperature rise, it is compensated for a signal that is reduced according to heat generation.

The FM amplifying unit 116 is provided to amplify the FM radio broadcasting signal amplified by the FM amplifying unit 1 114 to a signal level of a predetermined magnitude to a larger signal.

The FM detection unit 117 is provided for changing the wireless analog signal to a DC voltage. The signal changed to the DC voltage is applied to the digital signal processing unit 400, and the digital signal processing unit 400 controls the FM automatic gain control unit 113 to adjust the gain.

The FM magnetic-band filter unit 2 118 is provided to pass only the FM radio broadcast band purely in the amplified signal and to filter out signals of other bands. The FM radio broadcasting signal that has passed through the FM magnetic band filter unit 2 118 is combined with the DMB signal and the fire fighting radio signal in the bandpass combining unit 21 and then transmitted to the radio wave shadow area through the output unit 22.

Meanwhile, the FM radio broadcasting signal amplified while passing through the FM path unit 100 can be output at a constant level regardless of the input through the AGC function by removing the feedback signal by a subtraction operation in the digital signal processing unit 400. [ The digital signal processing unit 400 will be described later.

FIG. 3 is a block diagram for explaining the path of the fire signal in the line amplifying apparatus shown in FIG. 1. FIG. 3, the fire fighting radio path unit includes a fire fighting wireless band filter unit 311, a fire fighting radio switch unit 312, a forward path 320, a reverse path 340, a fire fighting radio switch unit 313 And a fire radio wave band filter unit 2 (314).

The fire-fighting radio-frequency band pass filter 311 passes only the fire-fighting radio signal band purely from the signal received from the band-pass distributor 12, and filters out signals of other bands. Also, the fire-fighting radio-frequency bandpass filter unit 311 passes only the fire-fighting radio signal band from the signal amplified through the reverse path 340 and transmits it to the bandpass distributor 12.

The fire-fighting radio switch 1 312 is switched according to the control of the digital signal processor 400 to forward the forward signal transmitted from the fire-fighting radio-frequency band filter unit 311 to the forward path 320 or the reverse path 340 To the side of the fire-fighting radio-frequency band-pass filter unit 311 side. The fire control unit 312 is controlled through the digital signal processing unit 400 and has a high degree of isolation so that it can be separated without interference and loss. In addition, the fire-fighting radio transmission unit 312 includes a down-conversion function for lowering the input signal.

The forward path 320 amplifies the fire wireless forward signal and transmits the amplified fire wireless forward signal to the propagation shadow area. The reverse path 340 amplifies the reverse signal input from the fire propagation shadow area and transmits the amplified reverse signal to the ground.

The fire-fighting radio switch unit 2 313 is switched according to the control of the digital signal processor 400 to forward the forward signal transmitted from the forward path 320 to the fire-fighting radio-frequency band filter unit 2 314, And transmits the reverse signal transmitted from the band filter unit 2 314 to the reverse path 340 side. The fire control unit 2 313 is controlled through the digital signal processing unit 400 and has a high degree of isolation so that it can be separated without interference and loss. Also, the fire-fighting radio transmission unit 2 (313) has a down-conversion function for lowering the input signal.

The fire-fighting radio-frequency band pass filter unit 2 314 passes only the fire-fighting radio signal band from the signal amplified through the forward path 320 and transmits it to the band-pass combiner 21. Also, the fire-fighting radio-frequency band pass filter unit 2 314 passes only the fire-fighting radio signal band purely from the signal received from the band-pass coupler 21, filters out signals of other bands, do.

The forward signal of the fire radio signal is amplified through the forward path 320 and the reverse signal is amplified through the reverse path 340. The amplification process of the forward and reverse signals is the same. Accordingly, 'a' is displayed after each configuration name of the forward path 320, 'b' is displayed behind each configuration name of the reverse path 340, and only the forward path 320 will be described below.

The forward path 320 includes a fire control switch a1 321, a fire control wireless automatic gain control unit a 322, a fire control wireless amplification unit a1 323, a fire control wireless coupling unit a 324, A fire wireless amplification unit a2 326, a fire wireless digital attenuation unit a 327, a fire wireless amplification unit a3 328, a fire wireless isolation unit a 329 and a fire prevention wireless transfer unit a2 330 .

The fire-fighting radio switch part a1 321 separates the fire-fighting radio forward signal transmitted from the fire-fighting radio-controlled switch part 312 into a high degree of isolation and transmits it to the fire-fighting wireless automatic gain control part a 322. In addition, the fire-fighting radio transmission section al (321) incorporates a down-conversion function for lowering the input signal. The fire-fighting radio transmission section al (321) is controlled by the digital signal processing section (400).

The fire alarm wireless automatic gain control unit a 322 controls the amplification gain of the fire signal. At this time, the gain is adjusted according to the magnitude of the input signal applied to the digital signal processor 400 through the fire alarm wireless detector a (325).

The fire wireless amplification unit a1 323 amplifies the fire wireless signal using a low noise amplifier.

The fire fighting wireless coupling part a 324 is provided for supplying a forward signal to the fire detection part a 325 and the digital signal processing part 400 without affecting the flow of the signal.

The fire wireless amplification unit a2 326 is provided for amplifying the fire wireless signal to a signal level of a predetermined size.

The fire wireless digital attenuator (a) 327 is provided to automatically adjust the magnitude of the fire wireless signal in a digital manner in cooperation with the digital signal processor 400. Internally, use Digital Step Attenuator to use 2bit, 3bit, 4bit, 6bit, 7bit (serial / parallel).

The fire wireless amplification unit a3 328 is provided to amplify the fire wireless signal amplified by the fire wireless amplification unit a2 326 to a signal level of a predetermined size to a larger signal.

The fire alarm wireless isolation unit a 329 feeds the fire alarm wireless signal to the digital signal processor 400. When the feedback signal is removed from the digital signal processor 400 by the subtraction operation, In other words, the fire-fighting wireless isolation unit a 329 functions to prevent a problem that may occur due to the reverse flow of the unknown signal in the digital signal processing unit 400. In addition, the fire isolation section 329 performs a kind of isolation function to prevent the signal from reversely flowing on the circuit internally due to some cause and to prevent the fire alarm amplification section a3 328 from being damaged. Another function of the fire fighting wireless isolation unit a 329 is to have a circuit that can be connected to the DSP inside the fire fighting wireless isolation unit a 329. The signal detected by the fire detection wireless unit a 325 and the signal detected by the fire wireless isolation unit a 329 are compared with each other.

The fire-fighting radio switch part a2 (330) separates the fire-fighting radio forward signal transmitted from the fire-fighting radio-frequency isolating part a (329) into a high degree of isolation and transmits it to the transfer part 2 side. The fire-fighting radio transmission section a2 (330) has a down-conversion function for lowering the input signal.

In the above description, the amplification process through the forward path 320 of the fire signal is described. Since the amplification process through the reverse path 340 is the same as the forward amplification process, it is omitted.

Meanwhile, the feedback signal amplified by passing through the forward path 320 is removed from the feedback signal by the subtraction operation in the digital signal processing unit 400, and a constant level output is possible regardless of the input through the AGC function. Hereinafter, the digital signal processing unit 400 will be described in detail with reference to FIG.

4 is a block diagram for explaining the digital signal processing unit 400 in the line amplification apparatus shown in FIG. As shown in FIG. 4, the digital signal processor 400 includes a coupling signal input unit 410 for converting a signal on the amplification path into a low-pass signal when it is input, A feedback signal input unit 420, a feedback interference eliminator 430 for eliminating a feedback signal by a subtraction operation, and an elimination signal output unit 440 for converting the signal from which the feedback signal has been removed into an original RF signal and outputting the signal do.

First, the coupling signal input unit 410 includes IF downconverter_a 411, ADC_a 412, and baseband downconverter_a 413.

IF downconverter_a 411 is provided for converting the radio signal RF to an intermediate frequency. That is, the FM signal inputted from the FM low-pass transformer 112 of the FM path unit 100, the low-frequency transform of the DMB signal input from the DMB low-pass transformer 212 of the DMB path unit 200, And is provided for low-pass-converting a forward signal or a backward signal inputted from the fire-fighting wireless coupling part a (324) or the fire-fighting wireless coupling part b (344) of the wireless path part.

The ADC_a 412 (Analog to Digital Converter) converts an analog signal that is low-frequency converted by IF to digital.

The baseband downconverter 413 (Baseband Down Converter) is provided for converting a digitally converted signal from the ADC_a 412 into a baseband signal. The baseband signal is input to a subtractor 431 of the feedback interference eliminator 430 to remove the feedback signal. The description will be made below.

The feedback signal input unit 420 includes IF downconverter_b 421, ADC_b 422, and baseband downconverter_b 423.

IF downconverter_b 421 is provided for converting the radio signal RF to an intermediate frequency. That is, the FM feedback signal input from the FM detecting unit 117 of the FM path unit 100, the DMB feedback signal inputted from the DMB detecting unit 217 of the DMB path unit 200, And is provided for low-pass-converting a forward or backward feedback signal input from the local fire fighting wireless isolation unit a 329 or the fire prevention wireless isolation unit b 349. Here, in the case of the fire-fighting radio signal, the feedback is also made in the fire detection unit 325 or the fire detection unit b 345, but the fire detection units 329 and 349 also feed back the signals to the DSP 400 and compare them.

The ADC_b 422 converts the analog signal that is low-frequency converted by the IF to digital.

The baseband downconverter 423 (Baseband Down Converter) is provided for converting the digitally converted signal from the ADC_b 422 into a baseband signal. The baseband signal is input to the feedback channel estimator 432 of the feedback interference eliminator 430 to extract the phase and size.

The interference cancellation part 430 includes a subtraction operation unit 431, a feedback channel estimation unit 432, an adaptive filter unit 433, and an ALC 434.

The subtraction operation unit 431 is provided for subtracting the corresponding signal from the baseband signal (i.e., the main transmission signal) input from the coupling signal input unit 410 to remove the feedback signal. Here, the corresponding signal is generated in the feedback channel estimating section 432 and the adaptive filter section 433.

The feedback channel estimator 432 extracts a phase and a size of a baseband signal (i.e., a feedback signal) input from the feedback signal input unit 420. The adaptive filter unit 433 And generates a corresponding signal by using the phase and magnitude information of the feedback signal extracted by the feedback channel estimator 432. The corresponding signal thus generated is provided to the subtraction arithmetic operation unit 431.

The ALC 434 (Automatic Level Control) automatically adjusts the level of the subtracted signal.

The feedback interference eliminator 430 uses a typical LMS (Least Mean Square) algorithm and uses a high-speed field programmable gate array (FPGA) to estimate and process the input signal in real time. Thus providing unparalleled predictability and reproducibility.

When the feedback signal is removed from the feedback interference eliminator 430, the signal is again output to each path via the cancellation signal output unit 440. The elimination signal output section 440 includes an IF up-converter 441, a DAC 442, and an RF up-converter 443.

The IF up-converter 441 high-band-converts the baseband signal from which the feedback signal has been removed by the feedback interference eliminator 430 to the intermediate frequency IF.

The DAC 442 (Digital to Analog Converter) converts a digital signal converted from an IF to a high frequency signal into an analog signal.

The RF up-converter 443 performs high-band conversion of the radio signal converted into analog into the original RF signal. The converted radio signal RF is output to the respective signal paths through the FM detecting unit 117, the DMB detecting unit 217, the fire wireless isolating unit a 329 or the fire wireless isolating unit b 349.

4, the synchronized LO 451 performs a function of converting an RF signal and an IF signal processing. In other words, the synchronized LO refers to the reference frequency source for converting the frequency up (IF to RF) and down (RF to IF, IF to baseband).

The DSP 400 described above continuously monitors the signals on each path and performs control when a problem occurs. In addition, by using the FPGA for each frequency, the sampling frequency of the frequency to be used is generated, and the digital signal processing is performed.

As described in detail above, the FM, terrestrial DMB, and fire fighting hybrid communication line amplifying apparatus according to the present invention have the following effects.

In particular, the digital signal processor 400 filters digital signals of each frequency channel, thereby reducing a communication disturbance due to mutual spurious signals between channels, and preventing generation of oscillation between channels by eliminating a feedback signal.

In addition, since the signal processing of the line amplifier can be digitized and can be monitored and controlled in real time through the modem unit 23, facility maintenance can be simplified and operating cost can be greatly reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And additions should be considered as falling within the scope of the claims of the present invention.

11: Input unit
12: bandpass distributor
21:
22: Output section
23: Modem section
100: FM path section
111: FM magnetic band filter unit 1
112: FM low-band transform unit
113: FM automatic gain control unit
114: FM amplification unit 1
115: FM temperature compensation control unit
116: FM amplification unit 2
117: FM detector
118: FM magnetic band filter part 2
200: DMB path section
211: DMB magnetic band filter unit 1
212: DMB low band transform unit
213: DMB automatic gain control unit
214: DMB amplification unit 1
215: DMB temperature compensation control unit
216: DMB amplification unit 2
217: DMB detector
218: DMB magnetic band filter unit 2
<Fire Ramp Path>
311: Fire-fighting radio-frequency band pass filter part 1
312: fire-fighting radio switch part 1
313: Fire-fighting radio switch part 2
314: Fire-fighting wireless band-pass filter part 2
320: Forward path
321: fire control radio transmission part a1
322: Wireless automatic gain control part a
323: Wireless radio amplification unit a1
324: Fire-fighting wireless coupling part a
325: Fire detection radio unit a
326: Fire radio amplification part a2
327: Fire radio digital attenuator a
328: Wireless radio amplification unit a3
329: Fire isolation part a
330: fire control radio transmission part a2
340: reverse path
341: Fire-fighting radio switch part b1
342: Wireless automatic gain control part b
343: Fire radio amplifier b1
344: Fire fighting wireless coupling b
345: Fire detection radio unit b
346: Fire wireless amplification unit b2
347: Fire digital wireless attenuation part b
348: Fire wireless amplification part b3
349: Fire fighting isolation b
350: Fire fighting part b2
400: digital signal processor
410: Coupling signal input part
411: IF Downconverter _a
412: ADC_a
413: Baseband downconverter _a
420: Feedback signal input section
421: IF Downconverter _b
422: ADC_b
423: Baseband downconverter _b
430: Feedback Interference Rejection
430: Feedback Interference Rejection
431:
432: Feedback channel estimating unit
433: adaptive filter unit
434: ALC
440: Removal signal output section
441: IF Up-Converter
442: DAC
443: RF upconverter
451: Synchronized LO

Claims

An input unit for receiving and transmitting a radio signal;
A bandpass distributor for passing and separating only a desired frequency band from a radio signal received through the input unit;
An FM path unit for amplifying and outputting an FM radio broadcast signal in a radio signal passed through the bandpass distributor;
A DMB path unit for amplifying and outputting a terrestrial DMB broadcasting signal from a radio signal passed through the bandpass distributor;
A fire-fighting radio path unit for amplifying and outputting a fire-fighting radio signal from the radio signal passed through the band-pass distributor;
A digital signal processor for digitally converting a radio signal passing through the FM path unit, the DMB path unit, and the fire radio path unit, thereby suppressing oscillation between channels by removing a feedback signal;
A band pass combining unit for combining the amplified radio signals for each frequency band in the FM path unit, the DMB path unit, and the fire-fighting radio path unit; And
And an output unit for outputting a radio signal coupled by the band-pass coupling unit to a radio wave shaded area.

The method according to claim 1,
And a modem unit for remotely transmitting a fault alarm, a signal alarm, and a DC voltage alarm signal through the FSK data, and receiving a remote control signal. The FM wireless terrestrial DMB and fire fighting hybrid line amplifying apparatus .

The method according to claim 1,
The FM path unit includes:
An FM magnetic-band filter unit 1 for passing only the FM radio broadcast band and filtering out signals of other bands from the radio signal received from the band-pass distributor;
An FM low-pass transformer for converting the FM radio broadcast signal to a low frequency;
An FM automatic gain controller for adjusting an amplification gain so that a signal having a predetermined amplitude is output regardless of an input size of the FM radio broadcast signal according to a control signal of the digital signal processor;
An FM amplifier 1 for amplifying the FM radio broadcast signal to a signal level of a predetermined magnitude;
An FM temperature compensation control unit for compensating for a signal reduced by the heat;
An FM amplifier 2 for amplifying an FM radio broadcast signal amplified by a signal level of a predetermined magnitude in the FM amplifier 1 to a larger signal;
An FM detection unit for changing the FM radio broadcast signal to a DC voltage; And
And an FM band filter unit 2 for passing only the FM radio broadcast band from the signal amplified by the FM amplifier unit 2,
The DMB path unit,
A DMB magnetic band filter unit 1 for passing only a DMB radio broadcast band and filtering signals of other bands in a radio signal received from the bandpass distributor;
A DMB low-pass transformer for converting the terrestrial DMB signal into a low frequency signal;
A DMB automatic gain controller for adjusting an amplification gain so that a signal of a predetermined size is output regardless of an input size of the terrestrial DMB signal according to a control signal of the digital signal processor;
A DMB amplifier 1 for amplifying the terrestrial DMB signal to a signal level of a predetermined magnitude;
A DMB temperature compensation controller for compensating a signal reduced by the heat;
A DMB amplifying unit 2 for amplifying the terrestrial DMB signal amplified by the DMB amplifying unit 1 to a signal level of a predetermined magnitude to a larger signal;
A DMB detecting unit for changing the terrestrial DMB signal to a DC voltage; And
And a DMB magnetic band filter unit (2) for passing only the DMB radio broadcast band from the signal amplified by the DMB amplifying unit (2).

The method according to claim 1,
Wherein the fire-
A fire wireless radio frequency band filter unit 1 for passing only a radio frequency signal band from a signal received from the band pass divider and filtering out signals in other bands;
A fire-fighting radio transmission unit 1 for transmitting a forward signal transmitted from the fire-fighting radio-frequency band filter unit 1 to a forward path side or a reverse-direction signal transmitted from a reverse path side to the fire-fighting radio-
The forward path for amplifying the fire wireless forward signal and transmitting it to the propagation shadow area;
The reverse path for amplifying and transmitting to the ground the fire reverse signal;
(2) for transmitting a forward signal transmitted from the forward path side to the fire alarm wireless band filter unit (2) or transmitting a reverse signal transmitted from the fire alarm wireless band filter unit (2) to the reverse path side; And
Pass only the fire signal band of the signal amplified through the forward path to the band pass combiner, pass only the fire signal band of pure fire signal from the signal received from the band pass combiner, And a fire radio wave band filter unit (2) for transmitting the radio wave to the fire-fighting radio transmission unit (2).