KR100228013B1 - Multichannel transmitting method for measuring a radio wave - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a multi-channel transmission device for radio wave measurement.

2. The technical problem to be solved by the invention

The present invention provides a multi-channel transmission apparatus for use in measuring radio propagation environments such as cellular mobile communication service and personal mobile communication service (PCS) requiring intersectoral interference and handoff coverage measurement. There is a purpose.

3. Summary of Solution to Invention

The present invention incorporates a plurality of signal sources having the same structure that can set respective frequencies and output levels, and a plurality of transmission modules that can transmit radio signals generated from the signal sources, thereby enabling frequency setting for each channel. By changing the transmission power, it is possible to efficiently and accurately measure a radio wave environment such as a cellular mobile communication network or a personal mobile communication network which requires a measurement of the degree of interference between handoff areas or sectors.

4. Important uses of the invention

The present invention is used for base station propagation environment measurement, high power amplifier characteristic measurement and propagation experiment.

Description

Multi-channel transmitter for radio wave measurement

The present invention relates to a multi-channel transmission apparatus for use in measuring radio wave propagation environments such as cellular mobile communication service and personal mobile communication service (PCS) requiring intersector interference and handoff coverage measurement. In particular, built-in multiple signal sources of the same structure that can set each frequency and output level, and a plurality of transmission modules that can transmit radio signals generated from this signal source, the frequency can be set for each channel and the transmission output The present invention relates to a multi-channel transmission apparatus capable of changing the frequency.

Conventional high power continuous wave (CW) transmitters or signal generators for measuring radio waves are implemented based on a short channel. Therefore, the measurement has been performed using three short-channel transmitters when the measurement of the handoff area or the degree of interference between sectors is necessary for the field test for the design of a base station of a cellular mobile communication network or a personal mobile communication network. .

By measuring the level of interference between handoff areas or sectors using three separate transmitters, a lot of time and effort have been involved in the installation and movement of test equipment, and the signal quality and Inefficiencies, such as requiring a calibration process due to differences in output levels, have been a problem.

The present invention devised to solve the above problems, by embedding a plurality of signal sources of the same structure that can set each frequency and output level and a plurality of transmission modules capable of transmitting radio signals generated from the signal source, By enabling the frequency setting for each channel and changing the transmission output, it is possible to efficiently and accurately measure the radio wave environment such as the cellular mobile communication network or the personal mobile communication network which requires the measurement of the degree of interference between the handoff area or the sector. It is an object of the present invention to provide a multichannel transmission apparatus.

1 is a block diagram of a three-channel transmission apparatus according to an embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

11: keypad 12: display device

13 alarm 14 controller

15: frequency generator 16: coaxial switch

17 staged attenuator 18 DC / DC converter

19: AC / DC converter 20: power amplifier

21 isolator 22 band pass filter

23: dial adjuster

In order to achieve the above object, the apparatus of the present invention comprises: a plurality of frequency generating means for generating a frequency in accordance with a first control signal, respectively; A plurality of switching means for switching on / off a frequency input from said plurality of frequency generating means in accordance with a second control signal; A plurality of attenuation means for receiving a frequency from the plurality of switching means and attenuating according to a third control signal to maintain an appropriate output level; A plurality of amplifying means for receiving the attenuated frequencies from the plurality of attenuation means and amplifying the signals according to a fourth control signal; A plurality of band pass filtering means for receiving the amplified frequencies from the plurality of amplifying means and passing the necessary bands; Input means for allowing an operator to input necessary information; Display means for displaying the result data for viewing by an operator; And outputting and controlling a control signal to the frequency generating means, the switching means, the attenuation means, and the amplifying means, respectively, according to the input information input from the input means, and branching the amplified frequency output from the amplifying means. Control means for outputting to the display means.

In addition, the apparatus of the present invention includes a plurality of anti-reflection means for receiving the amplified frequency from the plurality of amplifying means and outputting the amplified frequency to the band pass filtering means and preventing the reverse reflection output from the band pass filtering means; And an alarm means for generating an alarm in accordance with an alarm signal output from the control means when the control means outputs an alarm signal when an output abnormal condition occurs.

In addition, another apparatus of the present invention, a plurality of frequency generating means for generating a frequency in accordance with the first control signal, respectively; A plurality of switching means for switching on / off a frequency input from said plurality of frequency generating means in accordance with a second control signal; A plurality of adjustment means for inputting an attenuation adjustment signal for attenuating the frequency to an appropriate level; A plurality of attenuation means for receiving a frequency from the plurality of switching means and for attenuating according to the attenuation adjustment signals of the plurality of adjustment means such that an appropriate output level is maintained; A plurality of amplifying means for receiving the attenuated frequencies from the plurality of attenuation means and amplifying the signals according to a third control signal; A plurality of band pass filtering means for receiving the amplified frequencies from the plurality of amplifying means and passing the necessary bands; Input means for allowing an operator to input necessary information; Display means for displaying the result data for viewing by an operator; And outputting and controlling a control signal to the frequency generating means, the switching means, and the amplifying means, respectively, according to the input information input from the input means, and branching the amplified frequency output from the amplifying means to output to the display means. And control means for the control.

In addition, another apparatus of the present invention includes a plurality of anti-reflection means for receiving the amplified frequency from the plurality of amplifying means to output to the band pass filtering means and to prevent the reverse reflection output from the band pass filtering means; And an alarm means for generating an alarm in accordance with an alarm signal output from the control means when the control means outputs an alarm signal when an output abnormal condition occurs.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention;

1 is a block diagram of a three-channel transmission apparatus according to an embodiment of the present invention.

As shown in the drawings, the present invention provides a plurality of frequency generators for generating a reference frequency, an attenuator for controlling a signal input to a power amplifier, a band pass filter for passing only signals of a required band, and input and output signals and frequency. It is provided with a control panel for setting the output level of the.

Looking at one example of the configuration of the present invention as follows.

The three-channel transmission apparatus of the present invention, the three frequency generator 15 for generating each frequency in accordance with the control signal of the controller 14, the frequency input from the three frequency generator 15, the controller ( Three coaxial switches 16 for ON / OFF switching in accordance with the control signal of 14), the input of the frequency from the three coaxial switches 16 of the controller 14 so that the appropriate output level is maintained Three attenuators 17 for attenuating according to a control signal or an attenuation control signal of an external dial controller 23, and three for amplifying according to a control signal of the controller 14 by receiving the attenuated frequencies from the three attenuators. Two power amplifiers 20 and three amplified frequencies from the three power amplifiers 20 are output to the band pass filter 22, and each output signal is branched to the controller 14 and the band pass filter 22 From Three isolator 21 to prevent the directional reflection output, three band pass filter to receive the frequency from the three isolator 21 to remove the unnecessary band and pass only the required band to radiate the radio frequency through the antenna 22, a keypad 11 for the operator to input information necessary for a test such as frequency and output level, and a display device 12 for displaying the result data such as frequency and output level for the operator to view. The frequency generator 15, the coaxial switch 16, the stepped attenuator 17, and the power amplifier 20 are controlled according to the input information input from the keypad 11, and are output from the power amplifier 20. A controller 14 and the controller 14 for branching an amplified frequency and outputting the amplified frequency to the display device and outputting an alarm signal when an output abnormal condition occurs. Connected and a detector 13 for generating an alarm according to the alarm signal.

In addition, an AC / DC converter 19 for receiving alternating current from outside and converting it into DC is supplied to the power amplifier 20, and receiving DC from the outside or receiving DC from the AC / DC converter 19. A DC / DC converter 18 for converting the DC into the controller 14, the frequency generator 14, and the coaxial switch 16 is provided.

The present invention can be used as equipment for measuring IM (Inter Modulation) characteristics of a high power amplifier in a base station as well as measuring radio waves of a base station, and can be applied to measurement of a radio wave experiment requiring the same conditions.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

In the present invention as described above, a multi-channel wireless signal transmission module for generating a continuous wave and a plurality of frequency generators for generating a reference frequency are configured in one enclosure, and the multi-channel transmission is performed in common using a control panel and a power supply. Implementing the device has the following effects:

First, by monitoring the channels of a plurality of sectors at the same time, it is possible to observe in real time the change in the handoff area according to the terrain and the degree of interference between the sectors.

Second, accurate data extraction is possible by maintaining the same environment between sectors by simultaneous measurement of multi-channel signals.

Third, the measurement time between sectors can be shortened by measuring multiple sectors at the same time.

Fourth, by incorporating the multi-channel transmission module into one enclosure, it is possible to greatly improve the convenience of using the equipment, and greatly reduce the manufacturing cost.

Claims (6)

A plurality of frequency generating means for generating a frequency in accordance with the first control signal, respectively; A plurality of switching means for switching on / off a frequency input from said plurality of frequency generating means in accordance with a second control signal; A plurality of attenuation means for receiving a frequency from the plurality of switching means and attenuating according to a third control signal to maintain an appropriate output level; A plurality of amplifying means for receiving the attenuated frequencies from the plurality of attenuation means and amplifying the signals according to a fourth control signal; A plurality of band pass filtering means for receiving the amplified frequencies from the plurality of amplifying means and passing the necessary bands; Input means for allowing an operator to input necessary information; Display means for displaying the result data for viewing by an operator; And The control unit outputs and controls a control signal to the frequency generating unit, the switching unit, the attenuating unit, and the amplifying unit according to the input information input from the input unit, and branches the amplified frequency output from the amplifying unit. Control means for output by means Multichannel transmission device comprising a. The method of claim 1, A plurality of anti-reflection means for receiving the amplified frequencies from the plurality of amplifying means and outputting the amplified frequencies to the band pass filtering means and preventing the reverse reflection output from the band pass filtering means The multi-channel transmission device further comprises. The method according to claim 1 or 2, An alarm means for generating an alarm in accordance with an alarm signal output from said control means if said control means outputs an alarm signal when an output abnormal condition occurs; The multi-channel transmission apparatus further comprises. A plurality of frequency generating means for generating a frequency in accordance with the first control signal, respectively; A plurality of switching means for switching on / off a frequency input from said plurality of frequency generating means in accordance with a second control signal; A plurality of adjustment means for inputting an attenuation adjustment signal for attenuating the frequency to an appropriate level; A plurality of attenuation means for receiving a frequency from the plurality of switching means and for attenuating according to the attenuation adjustment signals of the plurality of adjustment means such that an appropriate output level is maintained; A plurality of amplifying means for receiving the attenuated frequencies from the plurality of attenuation means and amplifying the signals according to a third control signal; A plurality of band pass filtering means for receiving the amplified frequencies from the plurality of amplifying means and passing the necessary bands; Input means for allowing an operator to input necessary information; Display means for displaying the result data for viewing by an operator; And Outputting and controlling a control signal to the frequency generating means, the switching means, and the amplifying means according to the input information input from the input means, and branching the amplified frequency output from the amplifying means to output to the display means. Control means for Multichannel transmission device comprising a. The method of claim 4, wherein A plurality of anti-reflection means for receiving the amplified frequencies from the plurality of amplifying means and outputting the amplified frequencies to the band pass filtering means and preventing the reverse reflection output from the band pass filtering means The multi-channel transmission device further comprises. The method according to claim 4 or 5, An alarm means for generating an alarm in accordance with an alarm signal output from said control means if said control means outputs an alarm signal when an output abnormal condition occurs; The multi-channel transmission apparatus further comprises.

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