KR200346274Y1 - The RF Repeater System That Has Measuring Apparatus of Isolation Spectrum . - Google Patents

Abstract

RF relay system with Isolation Spectrum measurement device is published.

The present invention automatically measures the isolation spectrum between the antennas of transmission and reception in the band used by the RF relay in the operating state and informs the operator.

To provide a repeater that maintains high quality at all times in various interference environments,

The conventional operator measures the isolation spectrum between the transmitting and receiving antennas used in the RF repeater using a separate transmission characteristic measuring instrument (for example, a network analyzer), and amplifies and gains necessary for relaying with high quality based on the measured data. In the repeater to operate by setting the,

An isolation spectrum analysis control unit capable of always measuring an isolation spectrum between antennas of transmission and reception via a relay signal passing through the relay device in the relay device;

In accordance with the measured information in real time by controlling the amplification gain of the repeater provides a quality above a set level in the frequency band used,

The operator is provided with quantitative isolation spectrum information that can be adjusted to ensure that the relay device has sufficient isolation for operation.

Therefore, the present invention is built by operating the isolation spectrum measurement device in the RF repeater, it is possible to determine the constant operating conditions and to adjust the isolation of the transmission and reception antennas, and various interference that may occur within the frequency band used By automatically adjusting the instantaneous perception and the corresponding operating gains to the phenomenon, there is an effect that the RF repeater can be operated while maintaining a good quality level at the maximum allowable power.

Description

RF Repeater System That Has Measuring Apparatus of Isolation Spectrum.

The present invention relates to a device for measuring an isolation spectrum in an RF relay system, and more particularly to an apparatus for measuring an isolation spectrum in an RF relay system in operation having a transmitting antenna and a receiving antenna to relay signals of the same frequency. It is about.

The conventional RF relay system is composed of a reception antenna unit, a transmission antenna unit and a relay device as shown in FIG.

At this time, the transmission signal of the RF relay system amplifies the signal received through the reception antenna with a constant gain and radiates to the free space through the transmission antenna.

In addition, a part of the transmission signal is fed back through the various paths to the receiving antenna, and if the strength of the feedback signal is above a certain level (for example 10% or more), the relay quality of the relay device is sharply lowered and thus the transmission Isolation between antennas of reception and reception is generally 20 times (13db) to 50 times (17db) times or more than the operational gain of the relay, so that the management of the transmission between the antennas of the transmission and reception of the relay system is stable. It is necessary.

However, since the feedback is actually received with various path differences, whether the feedback signal comes directly or reflects by the reflector due to the interference characteristics of the radio wave, the received intensity is not constant in the band used and constructive interference according to the surrounding interference environment. Over-interference occurs and shows uneven characteristics for each frequency as shown in the measurement data of Example 180. Especially, in order to measure the isolation spectrum, a relay device and an aerial unit, that is, an antenna for transmission and reception, are connected. There is a problem that the communication is temporarily interrupted during the hassle and measurement time to separate and measure in the field by using a measuring instrument, and it is difficult to immediately respond to changes in the operating environment, such as the appearance of the actual moving object.

Referring to the prior art with reference to the drawings of Figure 1,

The reception antenna unit 110 is steered and installed at an angle with respect to the higher station for the purpose of receiving the higher station signal.

The repeater 170 performs a function of amplifying the signal received from the receiving antenna 110 to a strength sufficient to transmit,

An internal configuration of the repeater 170 includes: a receiver 171 which performs a function of filtering only a signal of a required frequency band among signals received from the reception antenna and amplifying it with a low noise amplifier;

A gain adjusting unit 172 for adjusting operating gain of the relay apparatus using a variable attenuation function with respect to the signal transmitted from the receiving unit 171;

And an amplifying transmitter 173 for high output amplifying the appropriately adjusted signal, cutting off noise in an unnecessary frequency band, and transmitting the output to the transmission antenna unit 150.

The transmission antenna unit 150 is an aerial means for steering the transmission output in the direction of the lower station and radiating it into free space.

At this time, if you want to measure the isolation spectrum between the transmitting antenna unit 150 and the receiving antenna unit 110,

First, the connection point 120 between the reception antenna unit 110 and the relay device 170 is separated, and after the connection point 140 between the transmission antenna unit 150 and the relay device 170 is separated, the network aral A test signal from a measuring device for a frequency section to be measured by connecting a transfer function measuring device 130 such as a network analyzer to the transmitting antenna unit 110 and the receiving antenna 150 using the connection points 120 and 140. By transmitting and receiving the isolation spectrum information between the antenna (110-150) can be obtained.

In addition, the obtained isolation spectrum generally has various arrival paths of the interference between the transmission antenna unit 150 and the reception antenna unit 110, so that mutual interference occurs in the various paths (161, 162) and thus for a specific frequency. Reinforcement 182 and cancellation 183 occur to exhibit non-uniform characteristics within the frequency band used.

That is, even in the case of fixed transmission and reception antennas, there is a problem in that the degree of isolation differs for each frequency according to the surrounding interference environment.

Therefore, in order to stably operate the relay system with the measurement result, the operation gain of the relay device 170 is determined based on the minimum isolation measurement value 182 within the frequency range of use of the measurement result.

That is, if the measured minimum isolation 182 value is 90db, the gain of the repeater that can be stably operated is preferably set to a gain of 75db minus at least 15db from the minimum isolation value. Do.

Therefore, the operator has to be in the field to obtain the isolation spectrum information,

A problem that communication is interrupted in the course of the measurement, and

There was a problem that it is difficult to immediately respond to the interference environment change that occurs arbitrarily during the operation of the relay system.

Therefore, the present invention has been made to solve the problems as described above, to provide the device to obtain and analyze the isolation spectrum information between the transmission and reception antennas without interruption in the operation of the relay device to operate the relay system. It is aimed at stabilizing extremely while showing maximum performance.

1 is a view showing a configuration for measuring the isolation spectrum in a conventional relay system.

Figure 2 is a view showing an embodiment of the RF relay system incorporating the present invention isolated spectrum measurement device

3 is a view showing a configuration of an apparatus for measuring an isolation spectrum used in the RF relay system of the present invention

*** Brief description of reference numbers ***

110: receiving antenna unit 120: receiving antenna connection point

130: network analyzer 140: transmission antenna connection point

150: transmitting antenna unit 160: reflector

161: direct path 162: reflection path

170: repeater 171: receiver

172: gain adjusting unit 173: amplifying transmitter

180: output data example 181: reference level

182: minimum isolation 183: maximum isolation

210: receiving antenna unit 250: transmitting antenna unit

260 reflector 261 direct path

262: reflection path 270: relay device

271: receiver 272: gain adjuster

273: isolation spectrum measuring device 274: amplifying transmitter

275 operation control unit 276 operation display unit

280: output display example 281: relay gain

282: minimum isolation 283: maximum isolation

310: repeater input signal 321: input signal detector

322: input signal frequency selector 323: input signal level detector

331: fine gain variation unit 332: central control unit

333: Operation setting unit 334: Operation output unit

341: output signal detector 342: output signal frequency selector

343: output signal level detector 350: repeater output signal

An RF relay system incorporating an isolation spectrum measuring device for achieving the object of the invention as described above will be described with reference to FIG.

The RF relay system includes a reception antenna unit 210 for receiving a signal fed back through various paths from a host station signal and a transmission antenna unit of the relay system, and

A repeater 270 for determining an operation gain based on a minimum isolation measurement value for each frequency within a frequency band in which the isolation spectrum measurement device of the present invention is used, and

It consists of a transmitting antenna unit 250 for radiating the amplified output from the relay device in the free space,

The configuration of the repeater 270 in which the isolation spectrum measurement device is built-in,

A receiving unit 271 which filters only signals in a frequency band used among the received signals of the receiving antenna and amplifies them with a strength sufficient for signal processing in the repeater using a noise amplifier, and

A gain adjuster 272 which is a variable attenuator means for determining, by external control, a gain suitable for operating a signal whose strength has been reinforced through the receiver according to a radio wave environment and an interference environment received by the relay device;

By measuring the isolation for each frequency in the frequency band used for the attenuated signal through the gain adjusting unit and transmitting the isolation to the amplifying transmitter, it is determined whether the current operating gain is appropriate based on the minimum value among the measured isolation values and a control signal. In order to ensure stable operation in real time within the range of oscillation allowed by the repeater, and to send the measured value to the operation display unit, the operator can always check the operation status. An isolation spectrum measuring device 273, and

Request information of the isolation spectrum measurement device by receiving the operation information such as the amount of fine gain variation and the measurement speed, the frequency band used, and the gain control limit value that the isolation spectrum measurement device 273 needs to operate as a dip switch or data. Operation setting unit 275 for providing the information as an electric signal at

An operation display unit 276 for externally outputting the device measured in the isolation spectrum measuring device in an electric form and elements such as LCD, LED, and serial communication data so that an operator can check the information;

An amplifying transmitter 274 for output-amplifying at a sufficient intensity to output a stable signal via the isolation spectrum measuring device 273 and suppressing and filtering an unnecessary band signal; It consists of.

Therefore, the reference of the isolation measurement value measured in the prior art is the output level 181 transmitted from the network analyzer as shown in the output data 180 in FIG.

Since the isolation measurement value measured using the relay signal of the present invention is based on the relay signal, the relay gain 281 of the repeater is a reference as shown in the example 280 of the output data shown in FIG. Have

Next, an isolation spectrum measuring apparatus that can be measured in the RF relay during the operation will be described with reference to FIG. 3.

The configuration of the isolation spectrum measuring apparatus according to the present invention includes an input detector 321, a fine gain variation unit 331, an output signal detector 341, an input signal frequency selector 322, an output signal frequency selector 342, and an input. And a signal level detector 323, an output signal level detector 343, a central controller 332, an operation setting unit 333, and an operation information output unit 334.

First, the input detector 321 receives the reception signal 310 of the repeater, and branches a part of the received input signal using a distribution means such as a divider or a coupler, and the branched signal selects an input frequency. It is sent to the unit 322 and the fine gain change unit 331.

The fine gain changer 331 controls the central control unit 332 by a minute amount (for example, the width of the general fading of the radio communication is about 0.5db or less compared with the degree of 20db) that does not affect the communication quality. By using an attenuator that can be adjusted to increase or decrease by the signal, the signal passing through the fine gain fluctuation part is sent to the output signal detector 341.

The output signal detector 341 receives the output signal of the fine gain changer 331 and branches the signal as the input signal detector 321 to the repeater output signal 350 and the output signal frequency selector 342. send.

The input signal frequency selector 322 selects and receives only a specific frequency and band to be measured from the signals received from the input signal detector 321. For example, by down-converting the received input signal and performing filtering on a specific band, only signals of a specific frequency and band may be selected according to the control of frequency selection of the central controller.

The output signal frequency selector 342 selects the signal received from the output signal detector 341 with the same characteristics as the input signal frequency selector 322 and selects only signals of a specific frequency and band from the frequency of the central controller 332. Select according to the control.

The input signal level detector 323 calculates and precisely measures the intensity of the signal selected by the input signal frequency selector 322 by the sum of the high-speed A / D conversion and the square, and requests the information of the central controller 332. The measurement provides the measurement information.

The output signal level detector 343 precisely measures the strength of the signal selected by the output signal frequency selector 342 by calculating a sum of squares of the high-speed A / D conversion and the square, as with the input signal level detector 323. To the central control unit.

The central control unit 332 refers to the information on the operating parameters from the operation setting unit, the fine gain variation unit 331, the input signal frequency selector 322, the output signal frequency selector 342, and the input signal level detector ( 323 and the output signal level detector 343 to control the isolation spectrum relative to the change amount of the input signal level and the output signal level according to the fine gain variation amount, and transmit the result to the operation information output unit 334. .

The operation setting unit 333 receives and stores parameters, such as the setting of the microgain variation range spectrum measurement period and the output control limit value, related to the operation from the operator, and provides related information when the central control unit 332 requests a reference.

The operation information output unit transmits control information such as the measured spectrum information and operation gain required by the repeater so that the operator can check the isolation spectrum, and performs an external control function for operating the repeater with optimal performance. .

It should be noted that the application of the isolation spectrum measuring apparatus that can be used in the relay apparatus of the present invention described above is not intended to limit the use of the present invention as an embodiment, but is for explanatory purposes for understanding. It is apparent to those skilled in the art that various modifications and variations are possible within the scope of the technical idea of the present invention as well as the output waveform monitoring, and such modifications and modifications are within the scope of the appended claims.

As described above, the present invention manages the operating gain of the repeater by always measuring the interference between the transmitting and receiving antennas at every frequency in every section within the frequency band used by the RF relay system to operate the stable repeater of the broadband with the optimum gain. In addition, by providing the operator with the isolation status information between the transmitting and receiving antennas in the relay system, it is effective to perform the aerial optimization required for stable operation.

Claims (3)

In a relay system that receives a radio signal of a higher station, amplifies through a relay device, and retransmits the received signal through a transmission antenna, a configuration of a relay system incorporating an isolation spectrum measurement device between the transmission and reception antennas is used. A reception antenna unit for receiving a signal fed back through a variety of paths from a host station signal and a transmission antenna unit of the relay system; And A repeater for determining an operation gain based on a minimum isolation measurement value for each frequency within a frequency band in which an isolation spectrum measuring device is built-in; And And a transmitting antenna unit for radiating the amplified output from the relay device to a free space. The configuration of the isolation spectrum measuring device according to claim 1, Receives a receiving signal 310 of the repeater, and branches a portion of the received input signal using a distribution means such as a divider or coupler, the branched signal is fine gain with the input frequency selector 322 An input detection unit 321 sent to the variation unit 331; And Fine gain fluctuation part 331 which transmits the fine gain which does not affect the communication quality with respect to the relaying signal to the output signal detection part 341 via the attenuator which can be adjusted so that increase and decrease is possible by control of the central control part 332. ; And An output signal detector 341 receives the output signal of the fine gain changer 331 and branches the signal like the input signal detector 321 and sends the signal to the repeater output signal 350 and the output signal frequency selector 342. ; And An input signal frequency selector 322 for selecting and receiving only a specific frequency and band to be measured from the signals received from the input signal detector 321; And An output signal frequency for selecting only signals of a specific frequency and band according to the control of frequency selection by the central controller 332 with the same characteristics as the input signal frequency selector 322 with the signals received from the output signal detector 341. Selector 342; And The intensity of the signal selected by the input signal frequency selector 322 is precisely measured by calculating the sum of the A / D conversion and the square of the high speed, and the measurement information is provided by the information request control of the central controller 332. An input signal level detector 323; And an output signal sent to the central controller by precisely measuring the intensity of the signal selected by the output signal frequency selector 342 and calculating a sum of squares of A / D conversion and square, as in the input signal level detector 323. A level detector 343; And An operation setting unit 333 which receives and stores parameters, such as a setting of a microgain variation range spectrum measurement period and an output control limit value related to operation from an operator, and provides related information when a request is requested from the central control unit 332; And The fine gain changer 331, the input signal frequency selector 322, the output signal frequency selector 342, the input signal level detector 323, and the output signal with reference to the information on the operation parameter from the operation setting unit. The central control unit 332 controls the level detector 343 to measure the isolation spectrum relative to the input signal level and the output signal level according to the fine gain variation, and sends the result to the operation information output unit 334. ); And Operation information output unit for transmitting the control information such as the measured spectrum information and the operating gain required by the repeater to check the isolation spectrum, and to perform an external control function to operate the repeater with optimal performance ;in Isolation spectrum measurement apparatus characterized in that the configuration. The method of claim 1, wherein the form of displaying the isolation spectrum is And a relative isolation value is displayed based on the relay gain 481 of the repeater.