JPS6338337A - Fault detecting system for space diversity receiver - Google Patents
Fault detecting system for space diversity receiverInfo
- Publication number
- JPS6338337A JPS6338337A JP61182437A JP18243786A JPS6338337A JP S6338337 A JPS6338337 A JP S6338337A JP 61182437 A JP61182437 A JP 61182437A JP 18243786 A JP18243786 A JP 18243786A JP S6338337 A JPS6338337 A JP S6338337A
- Authority
- JP
- Japan
- Prior art keywords
- receiver
- difference
- antenna
- receivers
- electric field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000012360 testing method Methods 0.000 claims abstract description 19
- 230000005684 electric field Effects 0.000 claims description 20
- 238000001514 detection method Methods 0.000 claims description 13
- 101100181417 Arabidopsis thaliana LAZ5 gene Proteins 0.000 abstract 2
- 101100283245 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GRX2 gene Proteins 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 4
- 238000010295 mobile communication Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 101100426970 Caenorhabditis elegans ttr-1 gene Proteins 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Monitoring And Testing Of Transmission In General (AREA)
- Radio Transmission System (AREA)
Abstract
Description
【発明の詳細な説明】
１産業上の利用分野〕
本発明は移動通信におけるスペースダイバーシティ受信
機の障害検出方式に関する。DETAILED DESCRIPTION OF THE INVENTION 1. Field of Industrial Application The present invention relates to a fault detection method for a space diversity receiver in mobile communications.
従来、移動通信における受信機の障害検出方式としては
、試験用送受信機（以ＩζＴ Ｔ Ｒと呼ぶ）を使用し
、′Ｉ″ＴＲより試験電波を発射し当該受信機にて受信
させ復調出力を確認することにより受信機の障害を検出
する方法がとられてきた。Conventionally, as a receiver failure detection method in mobile communication, a test transceiver (hereinafter referred to as IζTTR) is used, and a test radio wave is emitted from 'I'TR, received by the receiver, and demodulated output is output. A method has been used to detect receiver failure by checking.
第２図はこのスペースダイバーシティに使用する受信機
の障害検出方式の１例のブロック図である。図において
、１′はＴＴＲ１２はＴＴＲ用空中線、３及び５はスペ
ースダイバーシティ用受信機、４及び６は基地局用受信
空中線、１１は選択切替器、１２は復調器、１３は選択
後復調出力である。FIG. 2 is a block diagram of an example of a receiver fault detection method used for space diversity. In the figure, 1' is the TTR antenna, 3 and 5 are the space diversity receivers, 4 and 6 are the base station receiving antennas, 11 is the selection switch, 12 is the demodulator, and 13 is the demodulated output after selection. be.
ＴＴＲ１′のＴＴＲ用空中線２から発射された試験電波
は、基地局用受信空中線４及び６をへて受信機３及び５
にて受信され、それぞれの受信電界出力は選択切替器１
１に入力される。選択切替器１１は数ｋ Ｉｔ ｚのサ
ンプリングスピードで常時両者の入力レベルの比較を行
ない、大きい受信電界出力の方の受信機に自動的に切替
える動作を行なう。復調器１２は選択切替器１１で選択
した受信電界出力を復調し、復調出力１３として出力す
る。The test radio waves emitted from the TTR antenna 2 of the TTR 1' pass through the base station reception antennas 4 and 6 and are sent to the receivers 3 and 5.
and each received electric field output is selected by selection switch 1.
1 is input. The selection switch 11 constantly compares the input levels of the two at a sampling speed of several k It z, and automatically switches to the receiver with the larger received electric field output. The demodulator 12 demodulates the received electric field output selected by the selection switch 11 and outputs it as a demodulated output 13.
［発明が解決しようとする問題点〕
上述した従来のスペースダイバーシティ受信機の障害検
出方式では、選択切替器１１にて、常に受信電界出力の
大きい方の受信機に自動切替を行ってしまうため、仮り
に一方の受信機が障害を起こした状態であったとしても
、他方の受信機が正常であれば正規な復調出力１３が出
力されるため、′「Ｔ Ｒ，］にて試験を行なっても受
信機の障害を検出することができないという欠点かあっ
た。[Problems to be Solved by the Invention] In the conventional space diversity receiver failure detection method described above, the selection switch 11 always automatically switches to the receiver with the larger received electric field output. Even if one receiver is in a faulty state, if the other receiver is normal, a normal demodulated output 13 will be output, so please perform the test with 'TR,]. However, it also had the disadvantage of not being able to detect receiver failure.
本発明の目的は、このような欠点を除き、両方の受信機
の障害を確実に検出できるようにしたスペースダイバー
シティ受信機の障害検出方式を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a fault detection method for a space diversity receiver that eliminates such drawbacks and enables reliable detection of faults in both receivers.
［、問題点を解決するための手段〕
本発明の構成は、試験用送受信機に接続された第１の空
中線から発射された電波を第２の空中線に接続された第
１の受信機及び第３の空中線に接続された第２の受信機
でそれぞれ受信し、これら第１の受信機および第２の受
信機の各受信電界出力を検出して受信電界出力の大きい
側の受信信号を選択して復調信号を出力するスペースダ
イバーシティ受信機の障害検出方式において、前記第１
の受信機および前記第２の受信機の各受信電界出力の差
分を増幅する差分増幅器と、この差分増幅器の出力信号
を、あらかじめ求められた前記第１の空中線と前記第２
の空中線及び前記第３の空中線との間の空間伝搬損失の
差分に対応する電圧を発生ずる基準電圧発生器の出力信
号とを比較する比較器とを備え、前記試験用送受信機は
、前記第１の受信機及び第２の受信機がサービスに供用
される場合には前記差分増幅器の動作を停止させ、試験
時には、前記差分増幅器を動作するように制御して前記
第１の受信機と第２の受信機との受信電界出力の差を所
定の設定値と比較することにより、障害検出を行うこと
を特徴とする。[Means for Solving the Problems] The configuration of the present invention is to transmit radio waves emitted from a first antenna connected to a test transceiver to a first receiver connected to a second antenna and a first antenna connected to a test transceiver. The signal is received by a second receiver connected to the third antenna, and the received electric field output of each of the first receiver and the second receiver is detected, and the received signal with the larger received electric field output is selected. In a fault detection method for a space diversity receiver that outputs a demodulated signal using
a differential amplifier for amplifying the difference between the received electric field outputs of the receiver and the second receiver;
and a comparator for comparing an output signal of a reference voltage generator that generates a voltage corresponding to a difference in spatial propagation loss between the antenna and the third antenna. When the first receiver and the second receiver are used for service, the operation of the differential amplifier is stopped, and during testing, the differential amplifier is controlled to operate and the first receiver and the second receiver are operated. It is characterized in that failure detection is performed by comparing the difference in received electric field output between the two receivers and the second receiver with a predetermined setting value.
次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例のブロック図である。本実施
例は、従来の構成に対し、受信機３゜５の差分を検出す
る差分増幅器７と、この差分増幅器７の出力を基準電圧
発生器９の出力と比較する比較器８とが追加されている
。FIG. 1 is a block diagram of one embodiment of the present invention. In this embodiment, a difference amplifier 7 that detects the difference between the receivers 3.5 and a comparator 8 that compares the output of the difference amplifier 7 with the output of the reference voltage generator 9 are added to the conventional configuration. ing.
まず、ＴＴＲＩのｌ−Ｔ Ｒ用字中線２から発射された
試験電波は、基地局用受信空中線４及び６をへて受信機
３及び５にて受信される。受信機３及び５より出力され
るそれぞれの受信電界出力は、一方は差分増幅器７に、
他方な選択切替器１１に入力される。選択切替器１１は
数ｋ １１ ｚのサンプリングスピードで常時両者の入
力レベルの比較を行ない、大きい受信電界出力の方の受
信機に自動的に切替える動作を行なう。復調器１２は選
択切替器１１で選択した受信電界出力を復調し、復調出
力１３として出力する。First, a test radio wave emitted from the TTRI's l-TR central line 2 passes through the base station receiving antennas 4 and 6 and is received by the receivers 3 and 5. One of the received electric field outputs output from the receivers 3 and 5 is sent to a differential amplifier 7;
The signal is input to the selection switch 11 on the other hand. The selection switch 11 constantly compares the input levels of both at a sampling speed of several k 11 z, and automatically switches to the receiver with the larger received electric field output. The demodulator 12 demodulates the received electric field output selected by the selection switch 11 and outputs it as a demodulated output 13.
一方、差分増幅器７の動作は、ＴＴＲＩより送出される
制御信号１４により制御され、受信機３及び５がサービ
スに供用されている場合は動作を停止させ、試験時にお
いては動作状態とさせる。On the other hand, the operation of the differential amplifier 7 is controlled by a control signal 14 sent from the TTRI, and the operation is stopped when the receivers 3 and 5 are in service, and is kept in an operating state during a test.
従って、ＴＴＲＩで試験を行なう場合は、差分増幅器７
が動作状態となっているため、前記受信電界出力の差分
は増幅され比較器８に入力される。一方、基準電圧発生
器っけＴＴＲ用空中線２から受信空中線４までの間の空
間伝搬損失と、同様に受信空中線６までの間の空間伝搬
損失との差−〇−
分にあらかじめ対応させた電圧を発生し、比較器８の他
方に入力され、比較器８にて前記受信電界出力の差分と
比較される。すなわち、空間伝搬損失の差分け、Ｔ Ｔ
Ｒ，］と基地局用受信空中線４゜６の間が位置固定さ
れた無線回線のため、一義的に定まった値であり、仮り
に受信機３と受信ｆｉ５の受信電界出力に異常に大きい
差が発生した場合には、比較器８の出力は反転され、ど
ちらかの受信機が障害であるという障害情報１０を出力
することにより受信機の障害が検出される。Therefore, when testing with TTRI, the differential amplifier 7
is in the operating state, the difference in the received electric field output is amplified and input to the comparator 8. On the other hand, a voltage is set in advance to correspond to the difference between the spatial propagation loss between the reference voltage generator and the TTR antenna 2 to the receiving antenna 4, and the spatial propagation loss between the receiving antenna 6 as well. is generated and input to the other side of the comparator 8, where it is compared with the difference in the received electric field output. That is, the difference in spatial propagation loss, T T
R, ] and the base station receiving antenna 4°6 is a fixed-position wireless line, so this is a uniquely determined value, and if there is an abnormally large difference in received electric field output between receiver 3 and receiving fi5. If this occurs, the output of the comparator 8 is inverted, and a fault in the receiver is detected by outputting fault information 10 indicating that one of the receivers is faulty.
一方、受信機３及び受信機５がザービスに供用されてい
る場合は、移動している対移動局との無線回線になり、
常にフェージングを伴っているため、本来のスペースダ
イバーシティ受信方式特有の異常に大きい受信電界出力
差を発生するが、ＴＴＲ］により差分増幅器７の動作を
停止させられ、障害検出は行なわれないため誤った障害
情報の送出は避けられる。On the other hand, if the receivers 3 and 5 are used by a service, they become wireless links with mobile stations that are moving.
Because it is always accompanied by fading, it generates an abnormally large received electric field output difference that is unique to the original space diversity reception system. Sending of fault information can be avoided.
［発明の効果〕
以−１−説明したように、本発明はスペースダイバーシ
ティ受信方式において、Ｔ ＴＲを使用し基地局受信機
を試験する時に、ＴＴＲより供給される制御信号により
２台の受信機のそれぞれの受信電界出力の差分を、あら
がしめ求められているＴＴＲ用空中線と両受信空中線間
のそれぞれの空間伝搬損失の差分と比較制御することに
より、確実に受信機の障害を検出できるという効果があ
る。[Effects of the Invention] As explained in 1-1 below, the present invention provides a space diversity reception system in which when testing a base station receiver using a TTR, two receivers are controlled by a control signal supplied from the TTR. By comparing and controlling the difference in received electric field output of each with the difference in spatial propagation loss between the TTR antenna and both receiving antennas, it is possible to reliably detect receiver failure. effective.
第１図は本発明の一実施例のスペースダイバージデイ受
信機の障害検出方式を示すブロック図、第２図は従来の
スペースダイバーシティに使用する受信機の障害検出方
式を示すブロック図である。
１．１′・・・試験用送受信機（Ｔ”ＴＩ−？１２・・
・試験用送受信空中線、３．５・受信機、４．６・・・
基地局受信空中線、７・・・差分増幅器、８・・比較器
、９・・・基準電圧発生器、１０・障害情報、１１・・
選択切替器、１２・・・復調器、１３・・選択後復調出
力、１４・・・制御信号。
第 ｌ 圓
第 ２ 図FIG. 1 is a block diagram showing a failure detection method of a space divergence day receiver according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a failure detection method of a conventional receiver used for space diversity. 1.1'...Test transceiver (T"TI-?12...
・Test transmitting/receiving antenna, 3.5・Receiver, 4.6...
Base station reception antenna, 7...Differential amplifier, 8...Comparator, 9...Reference voltage generator, 10.Fault information, 11...
Selection switch, 12... Demodulator, 13... Demodulated output after selection, 14... Control signal. Figure 1: Figure 2
Claims (1)
た電波を第２の空中線に接続された第１の受信機及び第
３の空中線に接続された第２の受信機でそれぞれ受信し
、これら第１の受信機および第２の受信機の各受信電界
出力を検出して受信電界出力の大きい側の受信信号を選
択して復調信号を出力するスペースダイバーシティ受信
機の障害検出方式において、前記第１の受信機および前
記第２の受信機の各受信電界出力の差分を増幅する差分
増幅器と、この差分増幅器の出力信号を、あらかじめ求
められた前記第１の空中線と前記第２の空中線及び前記
第３の空中線との間の空間伝搬損失の差分に対応する電
圧を発生する基準電圧発生器の出力信号とを比較する比
較器とを備え、前記試験用送受信機は、前記第１の受信
機及び第２の受信機がサービスに供用される場合には前
記差分増幅器の動作を停止させ、試験時には、前記差分
増幅器を動作するように制御して前記第１の受信機と第
２の受信機との受信電界出力の差を所定の設定値と比較
することにより、障害検出を行うことを特徴とするスペ
ースダイバーシティ受信機の障害検出方式。Receiving radio waves emitted from a first antenna connected to a test transceiver with a first receiver connected to a second antenna and a second receiver connected to a third antenna, respectively, In the fault detection method of the space diversity receiver, which detects each received electric field output of the first receiver and the second receiver, selects the received signal with the larger received electric field output, and outputs the demodulated signal, a difference amplifier that amplifies the difference between the received electric field outputs of the first receiver and the second receiver; a comparator that compares the output signal of a reference voltage generator that generates a voltage corresponding to the difference in spatial propagation loss between the test transceiver and the third antenna; When the receiver and the second receiver are used for service, the operation of the differential amplifier is stopped, and during testing, the differential amplifier is controlled to operate and the first receiver and the second receiver are operated. A fault detection method for a space diversity receiver, characterized in that fault detection is performed by comparing the difference in received electric field output with a predetermined setting value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61182437A JPS6338337A (en) | 1986-08-01 | 1986-08-01 | Fault detecting system for space diversity receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61182437A JPS6338337A (en) | 1986-08-01 | 1986-08-01 | Fault detecting system for space diversity receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6338337A true JPS6338337A (en) | 1988-02-18 |
| JPH054860B2 JPH054860B2 (en) | 1993-01-21 |
Family
ID=16118254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61182437A Granted JPS6338337A (en) | 1986-08-01 | 1986-08-01 | Fault detecting system for space diversity receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6338337A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0977044A1 (en) * | 1998-07-31 | 2000-02-02 | Harada Industry Co., Ltd. | Mastless antenna test device |
| US6253067B1 (en) | 1997-06-27 | 2001-06-26 | Nec Corporation | Transmitter/receiver having an antenna failure detection system |
| KR100407935B1 (en) * | 1999-07-02 | 2003-12-01 | 엘지전자 주식회사 | Fail detecting device in Base Transceiver Subsystem and fail detecting method |
-
1986
- 1986-08-01 JP JP61182437A patent/JPS6338337A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6253067B1 (en) | 1997-06-27 | 2001-06-26 | Nec Corporation | Transmitter/receiver having an antenna failure detection system |
| EP0977044A1 (en) * | 1998-07-31 | 2000-02-02 | Harada Industry Co., Ltd. | Mastless antenna test device |
| KR100407935B1 (en) * | 1999-07-02 | 2003-12-01 | 엘지전자 주식회사 | Fail detecting device in Base Transceiver Subsystem and fail detecting method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH054860B2 (en) | 1993-01-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |