KR100229566B1 - A btu for directivity error correction - Google Patents

Abstract

Base station tester for directional error correction according to the present invention,

A directional coupler for connecting the antenna and the base station; A high frequency switch unit for connecting the power path transmitted from the base station and the power path reflected from the antenna, respectively; A power detector for detecting power from the two paths; A digital / analog converter for converting signals transmitted from the blocks; And an error correction unit for calculating the standing wave ratio of the antenna from the difference in power transmitted from the two paths, and an error correction memory for storing the directional error included in the power reflected from the antenna.

The computing device calculates an accurate antenna standing wave ratio without error by controlling the error value stored in the error correction memory from the power reflected from the antenna, and then obtaining a difference from the power transmitted from the base station.

Description

Base station tester for directional error correction

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station test unit (BTU) for correcting a directionality error, and is particularly generated by the directivity of a directional coupler (DC) for connecting an antenna and a base station tester. The present invention relates to a method for compensating for errors.

Personal Communication Service (PCS) and Code Division Multiple Access (CDMA) systems include a plurality of base station transceiver subsystems (BTSs), base station controllers (BSCs), and multiple base stations serving mobile terminals (mobile stations). It consists of Base Station Manager System (BSM), Mobile Switching Center (MSC) and Location Registration System that manages and operates the controllers.

The area served by each base station is called a cell and is generally divided into three sectors. This cell expands to the base station area, base station controller area, and switching center service area in order.

The base station tester is a base station test equipment installed and used in a CDMA base station. The base station tester is a device capable of periodically diagnosing and monitoring the normal operation of the base station system without additional measurement equipment while the base station system is in operation. .

The base station tester includes a directional coupler, a base station tester power supply unit (BPSU), an RF switch unit (RSWU) for selecting a transmit / receive antenna for each sector, and a base station test control and interface device ( BTU Control Interface Unit (BCIU), Test Mobile Station Unit (TMSU), Variable Attenuator Unit (ATTU) for controlling the size of the signal transmitted from each path.

The base station tester uses the transmit / receive standing wave ratio (VSWR), transceiver power tracking loop (TPTL), test mobile data display, remote control of the base station controller, channel quality check and It has a function such as call inspection.

1 shows a connection structure of a base station tester according to the prior art.

As illustrated, the base station 100 includes a base station tester 200 and an antenna unit 300.

The base station tester 200 includes a directional coupler 210 connected to the base station, a high frequency switch unit 220, a power detector 230, a digital / analog converter 240, and an arithmetic unit 250. .

In order to measure the presence or absence of an abnormality in the transmitter using the base station tester 200 configured as described above, a standing standing wave ratio (VSWR) of the transmitting antenna 300 is measured.

In order to measure the standing wave ratio of the transmitting antenna 300, an output signal generated at the base station 100 is transmitted to the base station tester 200 through the port A of the directional coupler 210.

The base station tester 200 selects an antenna path for a corresponding signal from the signal transmitted from the base station 100 through the high frequency switch 220, controls the power through the power detector 230, and then converts the digital / analog converter. The conversion is performed at 240.

Then, the calculating device unit 250 finally calculates the standing wave ratio of the antenna.

The high frequency switch 220 is connected to the port A of the directional coupler 210 to connect the transmission output power, the port B is connected to the power of the signal reflected from the antenna.

The standing wave ratio of the antenna is defined as the difference between the power level of the port A of the directional coupler 210 and the power level of the port B.

When measuring the power of the signal reflected from the antenna to measure the standing wave ratio of the antenna through the above process, two components of the signal is applied to the port B of the directional coupler 210.

That is, the original signal (path 2) reflected from the antenna and the unnecessary signal (path 3) due to the directionality of the directional coupler 210.

The directional signal of the directional coupler 210 is an unnecessary signal that causes a misalignment.

Since there is no method of removing such unnecessary signals in the prior art, there is a problem that an error occurs in the measurement of the standing wave ratio of the antenna.

Therefore, the present invention to solve the above problems,

An object of the present invention is to provide a base station tester including a read-only memory (ROM) for storing an error value due to the directional coupler.

1 is a connection structure of a base station tester according to the prior art.

2 is a block diagram of a base station tester according to the present invention.

<Description of the code | symbol about the principal part of drawing>

100: base station 200: base station tester

300: antenna unit

210: directional coupler 220: high frequency switch unit

230: power detector 240: digital / analog converter

250: arithmetic unit 260: error correction memory

The present invention was created to achieve the above object,

A directional coupler for connecting the antenna and the base station; A high frequency switch unit for connecting the power path transmitted from the base station and the power path reflected from the antenna, respectively; A power detector for detecting power from the two paths; A digital / analog converter for converting signals transmitted from the blocks; And an arithmetic unit for calculating the standing wave ratio of the antenna from the difference in power transmitted from the two paths, and an error correction memory for storing the directional error included in the power reflected from the antenna.

The base station tester for directional error correction according to the present invention includes a memory storing error corrected values for each signal in order to correct an error occurring in the directional coupler.

2 is a block diagram of a base station tester according to the present invention.

As illustrated, the base station tester 200 according to the present invention includes a directional coupler 210, a high frequency switch unit 220, a power detector 230, a digital / analog converter 240, and a computing device. It is composed of a unit 250 and an error correction memory 260.

The error correction memory 260 is configured as a read-only memory, and stores an error value due to the directionality of the directional coupler 210 generated according to the transmission output value of the base station.

The operation of the base station tester according to the present invention configured as described above is as follows.

To check for abnormalities in the transmitter, the standing wave ratio of the transmit antenna is measured.

The standing wave ratio of the transmitting antenna transmits the output signal generated at the base station through the high frequency switch unit 220, the power detector 230, the digital / analog converter 240, and the computing unit 250 through the port A of the directional coupler 210. Is measured by

The high frequency switch unit 220 is connected to the port B of the directional coupler 210, and measures the power of the signal reflected from the antenna.

The standing wave ratio of the antenna is obtained as the difference between the power level at the directional coupler 210 port A and the power level at the port B.

In this case, an unnecessary reflection signal (path 3) is included in the port B due to the directional coupler 210 to generate an error in measurement.

When calculating the standing wave ratio, the arithmetic unit 250 reads the error value stored in the error correction memory 260 and removes the error value from the measured power level.

At this time, an address for reading the error correction memory 260 becomes an input power level value, and a value read by the address becomes a corrected value obtained by removing an error due to directionality.

The error value recorded in the error correction memory 260 is different depending on the directionality of the directional coupler 210 used.

The present invention operating as described above,

In the base station tester for checking the abnormality of the base station, the accuracy of the standing wave ratio measurement is improved by eliminating an error component caused by the directional coupler that may occur when measuring the standing wave ratio of the antenna to check the state of the antenna.

Claims (3)

A directional coupler for connecting the antenna and the base station; A high frequency switch unit for connecting the power path transmitted from the base station and the power path reflected from the antenna, respectively; A power detector for detecting power from the two paths; A digital / analog converter for converting signals transmitted from the blocks; In the base station tester consisting of a computing device unit for calculating the standing wave ratio of the antenna from the difference in power transmitted from the two paths, And an error correction memory connected to the computing device to store the directional error included in the power reflected from the antenna. The method of claim 1, wherein the error correction memory, The ROM for storing the measurement error value by the directional coupler, characterized in that the base station tester for directional error correction. The method according to claim 1, The computing device unit, And removing a standing value by the value stored in the memory device from the power reflected from the antenna, and then calculating the standing wave ratio of the antenna.

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