KR100272007B1 - The method of rx vawr measurement at cdma-digital cellular bts - Google Patents

The method of rx vawr measurement at cdma-digital cellular bts Download PDF

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KR100272007B1
KR100272007B1 KR1019970081480A KR19970081480A KR100272007B1 KR 100272007 B1 KR100272007 B1 KR 100272007B1 KR 1019970081480 A KR1019970081480 A KR 1019970081480A KR 19970081480 A KR19970081480 A KR 19970081480A KR 100272007 B1 KR100272007 B1 KR 100272007B1
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signal
receiving
amplifier
output
converter
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KR1019970081480A
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Korean (ko)
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KR19990061224A (en
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현경석
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윤종용
삼성전자주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Abstract

PURPOSE: A method for measuring a receiving voltage standing-wave ratio in a CDMA(Code Division Multiple Access) digital cellular base station is provided to measure a correct receiving power using a transmission power detection board, so as to calculate an excellent receiving voltage standing-wave ratio. CONSTITUTION: A receiving signal generator generates a receiving signal, which is a predetermined size of test source for an optional measuring frequency, to deliver the receiving signal to an RF(Radio Frequency) interface unit. An amplifier amplifies a signal transmitted by being passed an initial part of a receiving unit. A receiving local signal generator generates a receiving local signal. A mixer mixes the signal generated in the receiving local signal generator with the signal amplified by the amplifier, to convert the mixed signal into an IF(Intermediate Frequency). An SAW(Surface Acoustic Wave) filter filters an output signal of the mixer. An amplifier re-amplifies an output signal of the SAW filter. A switch switches an output signal of the amplifier. A detector detects the switched signal, for conversion into a DC voltage signal. An A/D(Analog-to-Digital) converter converts an output of the converter into a digital value. And an EEPROM(Electrical Erasable Programmable Read Only Memory) stores an output of the A/D converter.

Description

코드 분할 다중 접속 시스템 디지틀 셀룰라 기지국에서 수신 전압 정재파비 측정 장치{THE METHOD OF RX VAWR MEASUREMENT AT CDMA-DIGITAL CELLULAR BTS}TECHNICAL FIELD The receiving voltage standing wave ratio measuring device in a digital cellular base station of a code division multiple access system.

본 발명은 800㎒ 대역의 CDMA(Code Division Multiple Access) 디지틀 셀룰라 기지국의 고주파수부 기지국 시험기에서 수신 전압 정재파비를 측정하는 장치에 관한 것으로서, 특히 수신 신호 발생기 기능과 수신 전력 측정 기능을 전송 전력 검출 보드가 대신함으로써 보다 빠르고 정확한 수신 전압 정재파비 측정을 가능하게 하는 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring a received voltage standing wave ratio in a high frequency part base station tester of a 800 MHz band code division multiple access (CDMA) digital cellular base station. This allows for faster and more accurate reception voltage standing wave ratio measurements.

종래의 수신 전압 정재파비 측정을 도 1과 도 2를 참고로 설명하면, CDMA 디지틀 셀룰라 기지국 고주파수부의 기지국 시험기내에 있는 시험 이동국에서 일정한 크기의 시험 소스(Source)를 발생시켜 고주파 인터페이스부로 보내준다.The conventional reception voltage standing wave ratio measurement will be described with reference to FIGS. 1 and 2, and a test source having a predetermined size is generated by a test mobile station in a base station tester of a CDMA digital cellular base station high frequency unit and sent to a high frequency interface unit.

고주파 인터페이스부에서는 수신된 신호를 방향성 결합기의 안테나 포트와 장치부 포트로 각각 스위칭 해주는 기능을 수행한다.The high frequency interface unit switches the received signal to the antenna port and the device port of the directional coupler, respectively.

먼저 시험 이동국으로부터 수신된 신호를 고주파 인터페이스부에서 방향성 결합기의 안테나 포트로 절체하여 안테나를 거쳐서 반사되게 하여 그 신호의 세기를 송수신기 장치에서 측정한다. 송수신기 장치에서는 수신 전력을 측정하는 별도의 기능이 없으므로 입력된 신호의 세기에 따라 달라지는 자동 이득 제어전압을 이용한다.First, the signal received from the test mobile station is transferred from the high frequency interface part to the antenna port of the directional coupler, reflected through the antenna, and the strength of the signal is measured in the transceiver device. Since the transceiver device does not have a separate function of measuring the received power, it uses an automatic gain control voltage that depends on the strength of the input signal.

먼저 안테나 포트로 수신되는 신호의 자동 이득 제어값을 기억한다.First, the automatic gain control value of the signal received at the antenna port is stored.

그리고 장치부 포트로 패쓰(Path)를 바꾸어 이미 기억하고 있던 안테나 포트로 수신된 신호의 자동 이득 제어값이 나올 때까지 기지국 시험기내의 가변 감쇠기를 조정하여 신호를 감쇠시켜 준다.The path is changed to the port of the device, and the attenuator is attenuated by adjusting the variable attenuator in the base station tester until the automatic gain control value of the signal received through the antenna port is stored.

이렇게 하여 자동 이득 제어값이 같아지면 안테나 포트와 장치부 포트로 수신되는 신호의 차는 조정해준 감쇠값과 같다.In this way, if the automatic gain control value is the same, the difference between the signal received at the antenna port and the device port is equal to the adjusted attenuation value.

이 값을 회복 손실로 하여 수신 전압 정재파비를 계산한다.The received voltage standing wave ratio is calculated using this value as a recovery loss.

그러나, CDMA 디지틀 셀룰라 기지국의 고주파부의 기지국 시험기에서 수신 전력을 측정할 때 시험 이동국에서 발생시킨 임의의 시험 소스를 송수신기 장치에서 측정하도록 하였으나, 시험 이동국에서 발생시킨 시험 소스 자체가 부정확하고 수신 전력을 측정하는 송수신기 장치의 정밀도가 대단히 미흡하였다.However, when measuring the received power in the base station tester of the high frequency part of the CDMA digital cellular base station, the transceiver apparatus measures any test source generated by the test mobile station, but the test source generated by the test mobile station is inaccurate and measures the received power. The accuracy of the transceiver device is very low.

또한 방향성 결합기로 수신되는 시험 이동국출력은 일반적인 가입자의 신호보다는 월등히 크기 때문에 시스템 운용 중에 가입자의 호들이 끊기거나 통화의 품질을 떨어뜨릴 수 있었다. 그리고 시험 이동국 신호의 입력에도 불구하고 끊기지 않는 호들은 외부 잡음 증가로 인해 자체 송신 출력을 증가시키게 되어 시험 이동국 신호의 크기를 측정할 수 없게 만든다.In addition, the test mobile station output received by the directional coupler is much larger than a typical subscriber's signal, so that the subscriber's calls may be dropped or the call quality may be degraded during system operation. And calls that are not interrupted, despite the input of the test mobile station signal, increase their transmit power due to increased external noise, making the size of the test mobile station signal unmeasurable.

그러므로 수신 전압 정재파비 측정은 호에 영향을 미칠 뿐만 아니라 측정 자체도 호의 영향을 받아서 불가능하게 되므로 기본적으로 호가 없는 상태에서 측정하여야 하는 문제점이 있다.Therefore, since the received voltage standing wave ratio measurement not only affects the call but also the measurement itself is impossible under the influence of the call, there is a problem that the measurement should be performed in the absence of the call.

따라서 본 발명은 상기한 바와 같은 문제점을 해결하기 위하여, 코드 분할 다중 접속 시스템 디지틀 셀룰라 기지국에서 수신 전압 정재파비 측정 장치를 제공하는 것을 목적으로 한다.Accordingly, an object of the present invention is to provide an apparatus for measuring a received voltage standing wave ratio in a digital division base station of a code division multiple access system in order to solve the above problems.

도 1 은 종래 방법에 의해 안테나 포트를 거친 신호의 세기 측정 구성도,1 is a configuration diagram for measuring the strength of a signal passing through an antenna port by a conventional method;

도 2 는 종래 방법에 의해 안테나 포트를 거친 신호와 비교하기 위하여 장치부 포트를 거친 신호의 세기 측정 구성도,2 is a configuration diagram for measuring the strength of a signal passing through an apparatus port in order to compare it with a signal passing through an antenna port by a conventional method;

도 3 은 본 발명에 의한 전압 정재파비 측정 장치의 구성도.3 is a block diagram of a voltage standing wave ratio measuring apparatus according to the present invention.

상기한 목적을 달성하기 위한 본 발명에 의한 코드 분할 다중 접속 시스템 디지틀 셀룰라 기지국에서 수신 전압 정재파비 측정 장치의 바람직한 일 실시예는, 시험 이동국과 송수신기 장치의 기능을 대신하는 전송 전력 검출 보드를 사용하는 것이 바람직하다. 또한 본 발명에 있어서, 고주파 전력을 측정할 때 송수신기 장치와 통신을 하지 않고 측정하는 것이 바람직하고, 측정 주파수를 자유롭게 바꾸어 시스템 운용 중에도 측정하는 것이 바람직하다.A preferred embodiment of the reception voltage standing wave ratio measuring device in a digital division base station of a code division multiple access system according to the present invention for achieving the above object is to use a transmission power detection board that replaces the functions of a test mobile station and a transceiver device. It is preferable. In the present invention, it is preferable to measure the high frequency power without communicating with the transceiver device, and it is preferable to change the measurement frequency freely and to measure the system even during system operation.

상기 전송 전력 검출 보드는,The transmission power detection board,

고주파 인터페이스부로 수신 신호를 발생하여 보내주는 수신 신호 발생기;A reception signal generator for generating and sending a reception signal to the high frequency interface unit;

수신부 초단을 거쳐 전송된 신호를 증폭하는 증폭기;An amplifier for amplifying the signal transmitted through the first stage of the receiver;

수신 로컬 신호를 발생하는 수신 로컬 신호 발생기;A receive local signal generator for generating a receive local signal;

수신 로컬 신호 발생기에서 발생된 신호와 증폭된 신호를 혼합하는 혼합기;A mixer for mixing the signal generated by the receiving local signal generator with the amplified signal;

이를 필터링하는 SAW 필터;SAW filter to filter this;

이를 다시 증폭하는 증폭기;An amplifier that amplifies it again;

스위칭하는 스위치;A switch for switching;

스위칭된 신호를 검출하는 검출기;A detector for detecting a switched signal;

검출된 아날로그 신호를 디지틀 값으로 바꾸는 A/D변환기(Analog-to-Digital converter); 및An analog-to-digital converter for converting the detected analog signal into a digital value; And

이 값을 저장하는 EEPROM을 구비하여 이루어지는 것이 바람직하다.It is desirable to have an EEPROM storing this value.

본 발명의 동작을 도 3을 참조하여 설명하면, CDMA 디지틀 셀룰라 기지국의 고주파수부의 기지국 시험기내에 있는 전송 전력 검출 보드의 수신 신호 발생기에서 임의의 측정 주파수에 대한 일정 크기의 시험 소스인 수신 신호를 발생시키고 이 신호를 고주파 인터페이스부로 보내준다.The operation of the present invention will be described with reference to FIG. 3, in which a receive signal generator of a transmission power detection board in a base station tester of a high frequency portion of a CDMA digital cellular base station generates a received signal that is a test source of a predetermined magnitude for any measurement frequency. This signal is sent to the high frequency interface.

고주파 인터페이스부에서는 수신된 신호를 수신부 초단 내에 있는 방향성 결합기의 안테나 포트와 장치부 포트로 각각 스위칭 해주는 기능을 수행한다.The high frequency interface unit switches the received signal to the antenna port and the device port of the directional coupler in the first stage of the receiver.

먼저 전송 전력 검출 보드로부터 수신된 신호를 고주파 인터페이스부에서 방향성 결합기의 안테나 포트로 절체하여 안테나를 통하여 반사되게 하여 수신 밴드 통과 필터, 저잡음 증폭기, 2방향 분할기를 거쳐 다시 전송 전력 검출 보드로 보내준다. 그리고 전송 전력 검출 보드로부터 수신된 신호를 고주파 인터페이스부에서 방향성 결합기의 장치부 포트로 절체하여 안테나에 반사되지 않게 하여 수신 밴드 통과 필터, 저잡음 증폭기, 2방향 분할기를 거쳐 다시 전송 전력 검출 보드로 보내준다.First, the signal received from the transmission power detection board is transferred from the high frequency interface unit to the antenna port of the directional coupler and reflected through the antenna, and then sent back to the transmission power detection board through the reception band pass filter, the low noise amplifier, and the two-way divider. The signal received from the transmission power detection board is transferred from the high frequency interface part to the device port of the directional coupler so that the signal is not reflected to the antenna and is sent back to the transmission power detection board through the reception band pass filter, the low noise amplifier, and the two-way divider. .

전송 전력 검출 보드에서는 수신된 신호를 일정 크기로 증폭시킨 다음에 혼합기에서 70㎒의 중간 주파수로 주파수 강하를 해주고 인접 주파수와의 간섭을 없애기 위해 600㎑ 밴드 넓이의 SAW 필터로 필터링한 후 검출기로 보내준다.In the transmit power detection board, the received signal is amplified to a certain size, then the frequency drop in the mixer is applied to the intermediate frequency of 70 MHz, filtered by a 600W band width SAW filter to remove the interference with adjacent frequencies, and then sent to the detector. give.

검출기에서는 입력 신호를 직류 전압으로 바꾼 후 A/D변환기에서 12비트 디지틀 값으로 바꾸어 EEPROM에 저장한다.The detector converts the input signal to a DC voltage and converts it to an 12-bit digital value from the A / D converter and stores it in the EEPROM.

이렇게 하여 EEPROM에 저장된 두 값을 비교하여 수신 전압 정재파비를 계산한다.In this way, the received voltage standing wave ratio is calculated by comparing two values stored in the EEPROM.

상기한 바와 같이 동작하는 본 발명은, 시험 이동국과 송수신기 장치의 전송 전력 검출 보드가 대신함으로써 우수한 수신 전력 측정 데이터를 확보할 수 있어서 정확한 수신 전압 정재파비를 산출함으로써 수신 안테나의 성능을 확인할 수 있고, 수신 전력을 측정할 때 송수신기 장치와의 통신이 필요 없기 때문에 측정시간을 대폭 단축시킬 수 있고 측정 알고리즘도 간략화 할 수 있고, 측정 주파수를 자유롭게 바꿀 수 있어서 시스템 운용 중에도 송수신기 장치가 사용하지 않는 주파수를 사용할 수 있으므로 가입자의 호나 통화품질에 영향을 주지 않아서 호가 있는 상황에서도 수신 전압 정재파비를 구할 수 있다.The present invention operating as described above can secure excellent reception power measurement data by replacing the transmission power detection boards of the test mobile station and the transceiver device, so that the performance of the reception antenna can be confirmed by calculating an accurate reception voltage standing wave ratio, Since no communication with the transceiver device is required when measuring the received power, the measurement time can be significantly shortened, the measurement algorithm can be simplified, and the measurement frequency can be freely changed to use frequencies not used by the transceiver device during system operation. Therefore, the received voltage standing wave ratio can be obtained even in the presence of a call without affecting the subscriber's call or call quality.

Claims (1)

수신부 초단과, 수신 신호를 상기 수신부 초단내에 있는 방향성 결합기의 안테나 포트와 장치부 포트로 스위칭해주는 고주파 인터페이스부를 구비하는 수신 전압 정재파비 측정 장치에 있어서,In the receiving voltage standing wave ratio measuring device having a first receiving unit and a high frequency interface unit for switching the received signal to the antenna port and the device unit port of the directional coupler in the receiving unit first stage, 임의의 측정 주파수에 대한 일정 크기의 시험 소스인 상기 수신 신호를 발생하여 상기 고주파 인터페이스부로 보내주는 수신 신호 발생기;A reception signal generator for generating the reception signal, which is a test source having a predetermined magnitude for a predetermined measurement frequency, and sending the received signal to the high frequency interface unit; 상기 수신부 초단을 거쳐 전송된 신호를 증폭하는 증폭기;An amplifier for amplifying the signal transmitted through the first stage of the receiver; 수신 로컬 신호를 발생하는 수신 로컬 신호 발생기;A receive local signal generator for generating a receive local signal; 상기 수신 로컬 신호 발생기에서 발생된 신호와 상기 증폭기에 의해 증폭된 신호를 혼합하여 중간 주파수로 변환시켜주는 혼합기;A mixer for mixing the signal generated by the reception local signal generator with the signal amplified by the amplifier and converting the signal to an intermediate frequency; 상기 혼합기의 출력 신호를 필터링하는 SAW 필터;A SAW filter for filtering the output signal of the mixer; 상기 SAW 필터의 출력 신호를 다시 증폭하는 증폭기;An amplifier for amplifying the output signal of the SAW filter again; 상기 증폭기의 출력 신호를 스위칭하는 스위치;A switch for switching the output signal of the amplifier; 상기 스위치에서 스위칭된 신호를 검출하여 직류전압 신호로 바꾸는 검출기;A detector for detecting a signal switched by the switch and converting the signal into a DC voltage signal; 상기 검출기의 출력을 디지틀 값으로 바꾸는 A/D변환기; 및An A / D converter for converting the detector output to a digital value; And 상기 A/D변환기의 출력을 저장하는 EEPROM을 포함하여 이루어지는 전송 전력 검출 보드를 구비함을 특징으로 하는 코드 분할 다중접속 디지틀 셀룰라 기지국에서 수신 전압 정재파비 측정 장치.And a transmission power detection board comprising an EEPROM storing the output of the A / D converter.
KR1019970081480A 1997-12-31 1997-12-31 The method of rx vawr measurement at cdma-digital cellular bts KR100272007B1 (en)

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KR100335631B1 (en) * 2000-06-14 2002-05-08 박종섭 Device and method for diagnosing bts transmit-receive antenna combined wide band and narrow band in imt-2000 system

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KR19990080086A (en) * 1998-04-13 1999-11-05 김영환 Receiving output measuring device using base station transmit power
KR20010057357A (en) * 1999-12-22 2001-07-04 박종섭 Character verification apparatus of RF receiver in base station of CDMA communication system
US6603810B1 (en) * 1999-12-30 2003-08-05 Samsung Electronics Co., Ltd. Combined system for calibrating receiver gain and measuring antenna impedance match and method of operation
KR100433877B1 (en) * 2002-04-24 2004-06-04 삼성전자주식회사 Apparatus for testing voltage standing wave ratio of receiver antenna in wide-band code division multiple access mobile communication system and method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100335631B1 (en) * 2000-06-14 2002-05-08 박종섭 Device and method for diagnosing bts transmit-receive antenna combined wide band and narrow band in imt-2000 system

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