JPH06132838A - Out-band interference wave removing device - Google Patents

Out-band interference wave removing device

Info

Publication number
JPH06132838A
JPH06132838A JP30590492A JP30590492A JPH06132838A JP H06132838 A JPH06132838 A JP H06132838A JP 30590492 A JP30590492 A JP 30590492A JP 30590492 A JP30590492 A JP 30590492A JP H06132838 A JPH06132838 A JP H06132838A
Authority
JP
Japan
Prior art keywords
interference wave
switch
filter
output
band
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.)
Pending
Application number
JP30590492A
Other languages
Japanese (ja)
Inventor
Takashi Inoue
隆 井上
Gunkichi Sato
軍吉 佐藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KDDI Corp
Original Assignee
Kokusai Denshin Denwa KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kokusai Denshin Denwa KK filed Critical Kokusai Denshin Denwa KK
Priority to JP30590492A priority Critical patent/JPH06132838A/en
Publication of JPH06132838A publication Critical patent/JPH06132838A/en
Pending legal-status Critical Current

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  • Noise Elimination (AREA)

Abstract

PURPOSE:To prevent the communication of a radio station from being disenabled by an intrusive interference by providing a filter for removing an interference wave component and a changeover switch for inserting this filter between an antenna system and a low-noise amplifier or bypassing the filter. CONSTITUTION:When no interference wave is intruded, the connecting state of a switch 2 that intervals between contact (a) and (b) and between contact (b) and (c) are respectively turned on, and a signal from an antenna 1 is applied to a low noise amplifier 7 through an RF line 6. When the interference wave is intruded, the contact connecting state of the switch 2 that intervals between the contacts (a) and (c) and between the contacts (b) and (d) are respectively switched to ON. Thus, the signal from the antenna 1 passes through an RF line 3, a filter 4 for removing the interference wave component and an RF line 5, passes through the switch 2 again and is applied to the amplifier 7 through the RF line 6. Thus, the interference wave component is sufficiently attenuated by the filter 4, and the signal of a desired communication channel can be stably received in the state of removing the disturbance caused by the interference component by the amplifier 7, a down converter 8 and a demodulator 9.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、周波数分割多元接続
(FDMA)方式による無線通信システムにおいて、該
システムに割り当てられた通信帯域の隣接帯域で使用さ
れる他システムからの干渉波により該システムに属する
無線局が通信不能に陥るのを防ぐ帯域外干渉波除去装置
に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency division multiple access (FDMA) type wireless communication system, by which an interference wave from another system used in an adjacent band of a communication band assigned to the system is applied to the system. The present invention relates to an out-of-band interference wave removing device that prevents a wireless station to which the wireless station belongs from falling into communication failure.

【0002】[0002]

【従来の技術】FDMA方式による無線通信システムで
は、該システムに割り当てられた通信帯域を複数の周波
数帯域に分割し、通信用のチャネルとして使用する。該
システムに属する無線局は、通常、アンテナ装置の受信
入力を、該システムに割り当てられた全チャネルを増幅
する広帯域の低雑音増幅器、周波数変換器に加えた後、
狭帯域の帯域通過フィルタにより所望信号チャネルを抽
出している。
2. Description of the Related Art In a wireless communication system of the FDMA system, a communication band assigned to the system is divided into a plurality of frequency bands and used as a communication channel. A radio station belonging to the system usually adds the reception input of the antenna device to a wide band low noise amplifier and frequency converter for amplifying all channels allocated to the system, and
A desired signal channel is extracted by a narrow band band pass filter.

【0003】[0003]

【発明が解決しようとする課題】上述のFDMAシステ
ムにおいて、例えば、地上系の無線システムと使用周波
数帯が隣接している移動体衛星通信システムのように、
地上系の無線システムの基地局等の近傍で移動体衛星通
信システムの地球局を運用する場合には、該地球局の受
信機に地上系の無線システムから混入する信号レベルが
所望信号レベルに比べ極端に大きくなり、広帯域低雑音
増幅器等の受信系で飽和が生じて通信不能になることが
ある。このような問題を防ぐためには、該システムに割
り当てられた通信帯域のみを通過させ、帯域外で急峻に
減衰する特性を有するフィルタを低雑音増幅器の入力側
で挿入することが望ましいが、高い無線周波帯において
急峻な選択特性を有する低損失のフィルタを得ることが
困難なため、これまでは、それぞれの無線システムで運
用される無線局間の距離(調整距離)を一定以上確保す
ることで上述の問題を回避している。このため、該調整
距離以内のエリアではサービスを提供できないことにな
る。
In the above-mentioned FDMA system, for example, a mobile satellite communication system in which a frequency band used is adjacent to a terrestrial radio system,
When operating an earth station of a mobile satellite communication system near a base station of a terrestrial radio system, the signal level mixed from the terrestrial radio system into the receiver of the earth station is lower than the desired signal level. It may become extremely large, and saturation may occur in a receiving system such as a wide band low noise amplifier, resulting in communication failure. In order to prevent such a problem, it is desirable to insert a filter having a characteristic of passing only the communication band assigned to the system and abruptly attenuating out of the band at the input side of the low noise amplifier. Since it is difficult to obtain a low-loss filter having a steep selection characteristic in the frequency band, it has been difficult to obtain a fixed distance (adjustment distance) between wireless stations operated by each wireless system. Is avoiding the problem. Therefore, the service cannot be provided in the area within the adjustment distance.

【0004】本発明は、FDMA方式による無線通信シ
ステムにおいて該システムに割り当てられた周波数帯域
の隣接帯域に混入する干渉波によって該システムに属す
る無線局が通信不能になるのを防ぐことのできる帯域外
干渉波除去装置を提供することを目的とする。
According to the present invention, in a wireless communication system based on the FDMA method, it is possible to prevent a wireless station belonging to the system from being unable to communicate due to an interference wave mixed in an adjacent band of a frequency band assigned to the system. An object is to provide an interference wave removing device.

【0005】[0005]

【課題を解決するための手段】この目的を達成するため
に、本発明は、FDMA方式による無線通信システムに
割り当てられた周波数帯域の境界近傍を減衰域とするフ
ィルタ(干渉波成分除去用フィルタ)と、該フィルタを
アンテナ装置と低雑音増幅器との間に挿入するかバイパ
スするかを切り替えるためのスイッチとを備えた構成を
有する。
To achieve this object, the present invention provides a filter (interference wave component removing filter) having an attenuation band near the boundary of a frequency band assigned to a wireless communication system of the FDMA system. And a switch for switching between inserting or bypassing the filter between the antenna device and the low noise amplifier.

【0006】[0006]

【作用】図1は、干渉波成分除去用フィルタの通過特性
を示したものである。隣接帯域に混入する干渉波を確実
に除去するため、該システムに割り当てられた周波数帯
域外での該フィルタの減衰量が充分大きくなるように設
定している。そのため、該フィルタの通過域は、該シス
テムに割り当てられた周波数帯域よりも狭帯域である。
従って、該フィルタをアンテナ装置と低雑音増幅器との
間に挿入すると、該無線局は該フィルタの減衰域に位置
するチャネル(図1中のCh1 〜Chk )が使用できな
くなるが、同時に干渉を受ける無線局の数は、該システ
ムに属する全無線局の一部であるとみなされるため、該
フィルタを挿入している無線局に対しては通信帯域の境
界近傍の(干渉波成分除去用フィルタの減衰領域として
用いられる)チャネルを割り当てないようにすることに
より、干渉を受けるエリアでもサービスが可能となる。
FIG. 1 shows the pass characteristic of the interference wave component removing filter. In order to reliably remove the interference wave mixed in the adjacent band, the attenuation amount of the filter outside the frequency band assigned to the system is set to be sufficiently large. Therefore, the pass band of the filter is narrower than the frequency band assigned to the system.
Therefore, if the filter is inserted between the antenna device and the low noise amplifier, the radio station cannot use the channels (Ch 1 to Ch k in FIG. 1) located in the attenuation region of the filter, but at the same time, the interference occurs. The number of wireless stations that receive the signal is considered to be a part of all the wireless stations that belong to the system. By not allocating a channel (used as the filter's attenuation region), service is possible even in areas subject to interference.

【0007】[0007]

【実施例】以下、図面を用いて本発明を詳細に説明す
る。図2は、本発明による帯域外干渉波除去装置の第1
の実施例を示すブロック図である。アンテナ装置1で受
信された信号はトランスファースイッチ2に加えられ
る。干渉波が混入していないとき、該スイッチ2の接続
状態をa―b間オン,c―d間オンとすることにより、
アンテナ装置1で受信された信号はRF線路6を通って
低雑音増幅器(LNA)7に加えられる。低雑音増幅器
7の出力はダウンコンバーター(D/C)8を通じて中
間周波に変換され、復調器(DEM)9へ加えられる。
干渉波が混入したときは、該スイッチ2の接続状態をa
―c間オン,b―d間オンに切り替えることにより、ア
ンテナ装置1より受信された信号は、RF線路3、干渉
波成分除去用フィルタ(FLT)4およびRF線路5を
経て再び該スイッチ2を通り、RF線路6を通じて低雑
音増幅器7に加えられる。これにより、干渉波成分はフ
ィルタ4により充分減衰を受けるため、所望の通信チャ
ネルの信号を低雑音増幅器7,ダウンコンバータ8,復
調器9により干渉波成分による妨害を除去した状態で安
定して受信することができる。
The present invention will be described in detail below with reference to the drawings. FIG. 2 shows a first embodiment of the out-of-band interference wave elimination device according to the present invention.
It is a block diagram showing an example of. The signal received by the antenna device 1 is applied to the transfer switch 2. When the interference wave is not mixed, the connection state of the switch 2 is turned on between a and b and between c and d,
The signal received by the antenna device 1 is applied to the low noise amplifier (LNA) 7 through the RF line 6. The output of the low noise amplifier 7 is converted into an intermediate frequency through a down converter (D / C) 8 and added to a demodulator (DEM) 9.
When an interference wave is mixed, change the connection state of the switch 2 to a.
By switching on between -c and bd, the signal received from the antenna device 1 passes through the RF line 3, the interference wave component removing filter (FLT) 4 and the RF line 5 and then switches to the switch 2 again. As shown, it is applied to the low noise amplifier 7 through the RF line 6. As a result, the interference wave component is sufficiently attenuated by the filter 4, so that the signal of the desired communication channel is stably received with the low noise amplifier 7, the down converter 8, and the demodulator 9 removing interference caused by the interference wave component. can do.

【0008】図3は、同じく本発明による帯域外干渉波
除去装置の第2の実施例を示すブロック図である。本実
施例では、干渉波成分除去用フィルタ4の入力端に干渉
波による飽和が生じない程度の比較的利得の低い低雑音
増幅器(LNA1)14を挿入している。第1の実施例
に比べると、干渉波成分除去用フィルタ4の通過損失の
許容量が増えるため、より急峻な選択特性を有するフィ
ルタを使用することができ、該フィルタ4を挿入した時
に無線局が使用できなくなるチャネル数を少なくするこ
とができる。なお、該増幅器14をアンテナ装置1とト
ランスファースイッチ2の間に挿入した場合は上記の作
用が得られるだけでなく、該スイッチ2の挿入損の許容
量も増える。
FIG. 3 is a block diagram showing a second embodiment of the out-of-band interference wave removing device according to the present invention. In the present embodiment, a low noise amplifier (LNA1) 14 having a relatively low gain that does not cause saturation due to an interference wave is inserted at the input end of the interference wave component removal filter 4. Compared with the first embodiment, the allowable amount of the pass loss of the interference wave component removing filter 4 increases, so that a filter having a steeper selection characteristic can be used, and when the filter 4 is inserted, the wireless station The number of channels that cannot be used can be reduced. In addition, when the amplifier 14 is inserted between the antenna device 1 and the transfer switch 2, not only the above-mentioned operation is obtained but also the allowable amount of insertion loss of the switch 2 is increased.

【0009】図4は、本発明による帯域外干渉波除去装
置の第3の実施例を示すブロック図である。ダウンコン
バーター8を通じて得られる中間周波数の受信信号は復
調器9の入力側で分岐され、IF線路16を通じて検波
器(DET)17に加えられる。検波器17の検波出力
はレベル判定回路18に加えられ、検波器17からの検
波レベルがあらかじめ設定したしきい値(第1しきい
値)を越えた場合には、干渉波が混入していると判定
し、制御信号線19を通じて干渉波除去回路15の中の
トランスファースイッチ2の接続をa―c間オン,b―
d間オンに切り替える。該スイッチ2の接続をa―c間
オン,b―d間オンの組み合わせからa―b間オン,c
―d間オンの組み合わせへ復帰するには、本装置を搭
載する無線局の使用者が手動により適宜復帰する方法、
通信開始信号あるいは通信終了の信号をトリガーとす
るかあるいは該スイッチ2の接続をa―c間オン,b―
d間オンへ切り替え後あらかじめ設定した時間が経過し
たときに強制的に復帰させる方法、干渉波成分除去用
フィルタ4の干渉波成分の減衰量をある一定値に設定
し、検波器17の検波出力から干渉波混入の有無を判定
し、該スイッチ2を制御する方法,等を用いることがで
きる。ただし、第3の方法については、該スイッチ2の
接続状態がa―c間オン,b―d間オンの組み合わせに
なると該干渉波成分除去用フィルタ4の減衰量に応じて
該検波器14の検波出力が下がるため、該スイッチ2の
接続状態をa―c間オン,b―d間オンの組み合わせか
らa―b間オン,c―d間オンの組み合わせへ復帰する
ためのしきい値(第2しきい値)はその逆の切り替えで
用いる第1しきい値より低く設定する必要がある。
FIG. 4 is a block diagram showing a third embodiment of the out-of-band interference wave removing device according to the present invention. The intermediate frequency received signal obtained through the down converter 8 is branched at the input side of the demodulator 9 and added to the detector (DET) 17 through the IF line 16. The detection output of the detector 17 is applied to the level determination circuit 18, and if the detection level from the detector 17 exceeds a preset threshold value (first threshold value), an interference wave is mixed. And the connection of the transfer switch 2 in the interference wave elimination circuit 15 is turned on between a and c through the control signal line 19, b-
Switch on for d. The connection of the switch 2 is changed from the combination of ON for ac and ON for bd to ON for ab and c.
-To return to the d-on combination, the user of the wireless station equipped with this device manually returns to the appropriate combination,
A communication start signal or a communication end signal is used as a trigger, or the connection of the switch 2 is turned on between ac and b,
A method of forcibly returning when a preset time has elapsed after switching on for d, setting the attenuation amount of the interference wave component of the interference wave component removal filter 4 to a certain constant value, and detecting the detection output of the detector 17. It is possible to use a method of determining the presence or absence of interfering waves and controlling the switch 2 from the above. However, regarding the third method, when the connection state of the switch 2 is a combination of ON for ac and ON for bd, the detector 14 of the interference wave component removal filter 4 is adjusted according to the attenuation amount of the interference wave component removal filter 4. Since the detection output is lowered, the threshold value (the first one) for returning the connection state of the switch 2 from the combination of a-c on and b-d on to ab-on and c-d on combination 2 threshold value) must be set lower than the first threshold value used for switching in the opposite direction.

【0010】図5は、本発明による帯域外干渉波除去装
置の第4の実施例を示すブロック図である。本実施例で
は、干渉波検出レベルの感度を高めるために検波器17
の入力点に干渉波成分抽出用フィルタ(FLTD)20
を挿入している。トランスファースイッチ2の接続状態
がa―b間オン,c―d間オンのときに干渉波が混入す
ると、分岐信号線路16における受信信号は、干渉波成
分の方が支配的であるため、直接検波器に接続しても干
渉波混入の判別は容易である。ところが、干渉波検出後
に該スイッチ2の接続状態ををa―c間オン,b―d間
オンの組み合わせに切り替えると干渉波成分が干渉波成
分除去用フィルタ4によって除去されるため、分岐信号
線路16における受信信号は所望信号の方が支配的とな
り、該検波出力から干渉波が混入し続けているかどうか
を判定することが困難となる。この問題を解決するた
め、干渉波が混入している帯域のみを通過させる干渉波
成分抽出用フィルタ20を検波器17の入力側に挿入
し、検波器17の検波レベルが干渉波成分の有無に支配
されるようにする。この場合もまた、第3の実施例の場
合と同様に、干渉波除去用フィルタ4の減衰域での減衰
量をある一定の値に設定しておく必要がある。
FIG. 5 is a block diagram showing a fourth embodiment of the out-of-band interference wave removing device according to the present invention. In the present embodiment, the detector 17 is provided to increase the sensitivity of the interference wave detection level.
Interference wave component extraction filter (FLTD) 20 at the input point of
Have been inserted. If an interference wave is mixed when the transfer switch 2 is connected between ab and on for cd, the interference signal component is predominant in the received signal on the branch signal line 16. Therefore, direct detection is performed. Even if it is connected to a vessel, it is easy to determine the interference wave mixture. However, when the connection state of the switch 2 is switched to a combination of a-c on and b-d on after the interference wave is detected, the interference wave component is removed by the interference wave component removal filter 4, so that the branch signal line The desired signal is dominant in the received signal at 16, and it is difficult to determine from the detection output whether the interference wave continues to be mixed. In order to solve this problem, an interference wave component extraction filter 20 that passes only the band in which the interference wave is mixed is inserted into the input side of the detector 17, and the detection level of the detector 17 determines whether there is an interference wave component. To be ruled. Also in this case, as in the case of the third embodiment, it is necessary to set the amount of attenuation in the attenuation band of the interference wave removing filter 4 to a certain value.

【0011】図6は、本発明による帯域外干渉波除去装
置の第5の実施例を示すブロック図である。本実施例で
は、干渉波検出用信号を干渉波除去回路15の入力側で
分岐抽出することを特徴としている。アンテナ装置1で
受信された信号はトランスファースイッチ2に取り込ま
れる前に分岐され、RF線路21を通じて検波器17に
取り込まれ、レベル判定回路18により干渉波混入の有
無を判定し、制御信号線19を通じて該スイッチ2の切
り換え制御を行う。干渉波検出用信号レベルは、該スイ
ッチ2の接続状態に影響されないので、レベル判定回路
18での干渉波混入の有無の判定が容易となる。
FIG. 6 is a block diagram showing a fifth embodiment of the out-of-band interference wave removing device according to the present invention. The present embodiment is characterized in that the interference wave detection signal is branched and extracted at the input side of the interference wave removing circuit 15. The signal received by the antenna device 1 is branched before being taken in by the transfer switch 2, taken in by the detector 17 through the RF line 21, and judged by the level judging circuit 18 whether or not the interference wave is mixed, and through the control signal line 19. Switching control of the switch 2 is performed. Since the interference wave detection signal level is not influenced by the connection state of the switch 2, it becomes easy for the level judgment circuit 18 to judge the presence or absence of interference waves.

【0012】図7は、本発明による帯域外干渉波除去装
置の第6の実施例を示すブロック図である。本実施例で
は、第5の実施例において低雑音増幅器をアンテナ装置
1の直後に挿入することを特徴としている。第5の実施
例では、低雑音増幅器7の入力側で受信信号を分岐する
ため、受信信号レベルが下がり、信号品質が劣化する。
そこで、干渉波による飽和が生じない程度の比較的低利
得の低雑音増幅器14をアンテナ装置1の直後に挿入す
ることにより、分岐による信号品質の劣化を防ぐもので
ある。また、低雑音増幅器14の挿入により、干渉波成
分除去用フィルタ4の通過損失の許容量が増すため、よ
り急峻な周波数選択特性を有するフィルタの使用が可能
となる。
FIG. 7 is a block diagram showing a sixth embodiment of the out-of-band interference wave removing device according to the present invention. This embodiment is characterized in that the low noise amplifier is inserted immediately after the antenna device 1 in the fifth embodiment. In the fifth embodiment, since the received signal is branched at the input side of the low noise amplifier 7, the received signal level is lowered and the signal quality is deteriorated.
Therefore, a relatively low gain low noise amplifier 14 that does not cause saturation due to an interference wave is inserted immediately after the antenna device 1 to prevent deterioration of signal quality due to branching. Further, the insertion of the low noise amplifier 14 increases the permissible amount of passage loss of the interference wave component removal filter 4, so that a filter having a steeper frequency selection characteristic can be used.

【0013】図8は、本発明による帯域外干渉波除去装
置の第7の実施例を示すブロック図であり、2種類の干
渉波成分除去用フィルタを具備するとともに周波数変換
後の受信信号を分岐して干渉波成分の検出に用いた場合
を示している。アンテナ装置1で受信された信号は単極
多投スイッチ11に加えられ、干渉波が混入していない
ときには、単極多投スイッチ11および13はRF線路
12に接続され、受信信号は、この線路を通じて低雑音
増幅器7に入力される。干渉波が混入した場合には、検
波器17の出力レベルの状態に応じて単極多投スイッチ
11および13を、並列に接続したnー1種類の干渉波
成分除去用フィルタ4の中から適切なものを選択して切
り替える。例えば、図9に示す通過特性を有する干渉波
成分抽出用フィルタ20および干渉波成分除去用フィル
タ4を具備しているものとすると、干渉波がf1 とf2
の周波数帯域に混入した場合には#1の検波器出力のみ
がしきい値を越え、f2 より低い周波数帯に干渉波が混
入した場合には#1および#2の検波器出力がともにし
きい値を越える。このとき、#1を優先することにすれ
ば、前者の場合には、#1の干渉波成分除去用フィルタ
4を接続し、後者の場合には#2の干渉波成分除去用フ
ィルタ4を接続することになり、干渉波がf2 より低い
周波数にのみ混入した場合には一部の通信チャネルを犠
牲にすることなく干渉波を除去することができる。ま
た、#1と#2との中間的な特性を有する干渉波成分除
去用フィルタおよび干渉波成分抽出用フィルタを追加す
れば、干渉波混入の状態に応じて、適切な干渉波成分除
去用フィルタをより極め細かく選択することができるの
で、該フィルタの挿入によって使用できなくなる通信チ
ャネルの数を最小限に抑さえることができる。
FIG. 8 is a block diagram showing a seventh embodiment of an out-of-band interference wave removing device according to the present invention. It is equipped with two types of interference wave component removing filters and branches a received signal after frequency conversion. It shows the case where it is used to detect the interference wave component. The signal received by the antenna device 1 is applied to the single-pole multiple-throw switch 11, and when no interference wave is mixed, the single-pole multiple-throw switches 11 and 13 are connected to the RF line 12, and the received signal is the line. Through the low noise amplifier 7. When the interference wave is mixed, the single-pole multi-throw switches 11 and 13 are appropriately selected from among the n-1 types of interference wave component removing filters 4 connected in parallel according to the state of the output level of the detector 17. Select the appropriate one and switch. For example, assuming that the interference wave component extraction filter 20 and the interference wave component removal filter 4 having the pass characteristics shown in FIG. 9 are provided, the interference waves are f 1 and f 2.
Of when mixed in the frequency band # 1 only detector output exceeds the threshold, # 1 and # detector output 2 together when the interference wave in a frequency band lower than f 2 is mixed Exceeds the threshold. At this time, if priority is given to # 1, in the former case, the interference wave component removing filter 4 of # 1 is connected, and in the latter case, the interference wave component removing filter 4 of # 2 is connected. Therefore, when the interference wave is mixed only in the frequency lower than f 2 , the interference wave can be removed without sacrificing some communication channels. Further, by adding an interference wave component removal filter and an interference wave component extraction filter having intermediate characteristics between # 1 and # 2, an appropriate interference wave component removal filter can be obtained depending on the state of interference wave mixing. Can be selected more finely, so that the number of communication channels that cannot be used due to the insertion of the filter can be minimized.

【0014】以上の説明では、FDMA無線通信システムに
割り当てられた周波数帯域の低い側の隣接帯域について
述べたが、該帯域の高い側の隣接帯域に対しても適用可
能なことは言うまでもない。
In the above description, the adjacent band on the lower side of the frequency band assigned to the FDMA wireless communication system has been described, but it goes without saying that it can be applied to the adjacent band on the higher side of the band.

【0015】[0015]

【発明の効果】本発明による帯域外干渉波除去装置を搭
載した無線局のうち、該無線局が属するシステムに割り
当てられた周波数帯域の隣接帯域に混入する他システム
からの干渉波の影響を受けている無線局は、干渉波成分
除去フィルタの挿入により、通信帯域の境界部分のチャ
ネルを用いることはできなくなるものの、受信系の飽和
によって通信不能に陥るのを防ぐことができる。干渉波
の影響を受けていない無線局は、アンテナ装置と低雑音
増幅器とが直接接続されるため、該システムに割り当て
られた周波数帯域中のいずれのチャネルでも通信可能で
ある。従って、システム全体としては、該システムに割
当てられた周波数帯域中の各チャネルの使用効率の低下
を最小限に抑さえて通信サービスを提供することができ
る。
Of the radio stations equipped with the out-of-band interference wave canceller according to the present invention, it is affected by interference waves from other systems mixed in adjacent bands of the frequency band assigned to the system to which the radio station belongs. Although the wireless station cannot use the channel at the boundary of the communication band by inserting the interference wave component removal filter, it can prevent the communication from being disabled due to the saturation of the receiving system. Since the antenna device and the low noise amplifier are directly connected to the wireless station that is not affected by the interference wave, communication can be performed on any channel in the frequency band assigned to the system. Therefore, as a whole system, it is possible to provide a communication service while suppressing a decrease in use efficiency of each channel in the frequency band assigned to the system to a minimum.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明による帯域外干渉波除去装置で用いられ
る干渉波成分除去用フィルタの通過特性を示す図であ
る。
FIG. 1 is a diagram showing a pass characteristic of an interference wave component removing filter used in an out-of-band interference wave removing device according to the present invention.

【図2】本発明による帯域外干渉波除去装置の一実施例
を示すブロック図である。
FIG. 2 is a block diagram showing an embodiment of an out-of-band interference wave removing device according to the present invention.

【図3】本発明による帯域外干渉波除去装置の一実施例
を示すブロック図である。
FIG. 3 is a block diagram showing an embodiment of an out-of-band interference wave removing device according to the present invention.

【図4】本発明による帯域外干渉波除去装置の一実施例
を示すブロック図である。
FIG. 4 is a block diagram showing an embodiment of an out-of-band interference wave removing device according to the present invention.

【図5】本発明による帯域外干渉波除去装置の一実施例
を示すブロック図である。
FIG. 5 is a block diagram showing an embodiment of an out-of-band interference wave removing device according to the present invention.

【図6】本発明による帯域外干渉波除去装置の一実施例
を示すブロック図である。
FIG. 6 is a block diagram showing an embodiment of an out-of-band interference wave removing device according to the present invention.

【図7】本発明による帯域外干渉波除去装置の一実施例
を示すブロック図である。
FIG. 7 is a block diagram showing an embodiment of an out-of-band interference wave removing device according to the present invention.

【図8】本発明による帯域外干渉波除去装置の一実施例
を示すブロック図である。
FIG. 8 is a block diagram showing an embodiment of an out-of-band interference wave removing device according to the present invention.

【図9】本発明による帯域外干渉波除去装置の図8の実
施例における干渉波成分除去用フィルタと干渉波成分抽
出用フィルタの通過特性を示す図である。
9 is a diagram showing pass characteristics of an interference wave component removal filter and an interference wave component extraction filter in the embodiment of FIG. 8 of the out-of-band interference wave removal device according to the present invention.

【符号の説明】[Explanation of symbols]

1 アンテナ装置 2 トランスファースイッチ 3,5,6,12,21 RF線路 4 干渉波成分除去用フィルタ(FLT) 7,14 低雑音増幅器(LNA) 8 ダウンコンバーター(D/C) 9 復調器(DEM) 10 帯域外干渉波除去装置 11,13 単極多投スイッチ 15 干渉波除去回路 16 IF線路 17 検波器(DET) 18 レベル判定回路 19 制御信号線 20 干渉波成分抽出用フィルタ(FLTD) 1 Antenna Device 2 Transfer Switch 3, 5, 6, 12, 21 RF Line 4 Interference Wave Component Removal Filter (FLT) 7,14 Low Noise Amplifier (LNA) 8 Down Converter (D / C) 9 Demodulator (DEM) 10 Out-of-band interference wave removing device 11, 13 Single pole multiple throw switch 15 Interference wave removing circuit 16 IF line 17 Detector (DET) 18 Level determination circuit 19 Control signal line 20 Interference wave component extraction filter (FLTD)

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 割り当てられた周波数帯域中の隣接帯域
との境界部分を減衰領域とする干渉波成分除去用フィル
タを具備し、干渉波のないときには該フィルタをアンテ
ナ装置と受信装置の低雑音増幅器との間に挿入せしめま
た干渉波のあるときには該フィルタをバイパスして該ア
ンテナ装置と該低雑音増幅器とを直接に相互接続せしめ
るスイッチを具備した帯域外干渉波除去装置。
1. A low noise amplifier for an antenna device and a receiving device, comprising a filter for removing an interference wave component having an attenuation region at a boundary with an adjacent band in the allocated frequency band, when there is no interference wave. And an out-of-band interference wave eliminating device comprising a switch for inserting the filter between the antenna device and the low noise amplifier by bypassing the filter when there is an interference wave.
【請求項2】 さらに、前記アンテナ装置に接続された
低雑音増幅器の出力または前記受信装置内の周波数変換
後の出力のいずれかの受信信号を分岐して検波器に接続
するとともに、該検波器の検波出力とあらかじめ設定し
たしきい値とを比較することにより干渉波の有無を判定
するレベル判定回路を具備し、該レベル判定回路が干渉
波を検出した場合には、前記スイッチに接続された制御
信号線を通じて該スイッチの接続状態をバイパス側から
前記干渉波成分除去用フィルタ側に切り替えせしめるよ
うに構成されたことを特徴とする請求項1に記載の帯域
外干渉波除去装置。
2. A received signal of either the output of a low noise amplifier connected to the antenna device or the output after frequency conversion in the receiving device is branched and connected to a detector, and the detector is also provided. It is equipped with a level judgment circuit for judging the presence or absence of an interference wave by comparing the detection output of the device with a preset threshold value, and when the level judgment circuit detects the interference wave, it is connected to the switch. The out-of-band interference wave elimination device according to claim 1, wherein the connection state of the switch is configured to be switched from a bypass side to the interference wave component elimination filter side through a control signal line.
【請求項3】 さらに、該スイッチの入力側で受信信号
を分岐し、該分岐信号を、干渉波を検出するための検波
器に印加するとともに、該検波器の検波出力とあらかじ
め設定したしきい値とを比較することにより干渉波の有
無を判定するレベル判定回路を具備し、該レベル判定回
路が干渉波を検出した場合には、前記スイッチに接続さ
れた制御信号線を通じて該スイッチの接続状態をバイパ
ス側から前記干渉波成分除去用フィルタ側に切り替えせ
しめ、該しきい値を下回った場合には、該スイッチに接
続された該制御信号線を通じて該スイッチの接続状態を
バイパス側から該フィルタ側に切り替えせしめるように
構成されたことを特徴とする請求項1に記載の帯域外干
渉波除去装置。
3. The input signal of the switch branches the received signal, the branched signal is applied to a detector for detecting an interference wave, and the detection output of the detector is preset as a threshold. A level determination circuit for determining the presence or absence of an interference wave by comparing the value with a value, and when the level determination circuit detects the interference wave, the connection state of the switch through a control signal line connected to the switch Is switched from the bypass side to the filter side for removing the interference wave component, and when it is below the threshold value, the connection state of the switch is changed from the bypass side to the filter side through the control signal line connected to the switch. The out-of-band interference wave removing device according to claim 1, wherein the out-of-band interference wave removing device is configured to be switched to.
【請求項4】 アンテナ装置からの受信信号線路が1入
力n出力(nは2以上の整数)の第1スイッチの入力点
に直接接続され、該第1スイッチの第1出力点はn入力
1出力の第2スイッチの第1入力点に接続され、第1ス
イッチの第2出力点から第n出力点まではそれぞれ通過
特性が相異なりかつ割り当てられた周波数帯域中の隣接
帯域との境界部分を減衰領域とするnー1個の干渉波成
分除去用フィルタを並列に並べたフィルタ群の各入力点
に接続され、該フィルタ群の各出力点は第2スイッチの
第2入力点から第n入力点にそれぞれ接続され、該第2
スイッチの出力点が受信装置の低雑音増幅器に接続さ
れ、該第1スイッチの入力側、前記低雑音増幅器の出力
あるいは周波数変換後のいずれかの受信信号を分岐し、
該分岐信号を前記nー1個の該干渉波成分除去用フィル
タにそれぞれ対応するように並列に並べたnー1個の干
渉波成分抽出用フィルタに分配し、該干渉波成分抽出用
フィルタの出力側にそれぞれ接続されたnー1個の検波
器の出力とあらかじめ設定したしきい値とを比較するこ
とにより干渉波の有無を判定するレベル判定回路を具備
し、すべての該検波出力が該しきい値を下回ったときに
は第1スイッチの入力点および第2スイッチの出力点を
それぞれ第1出力点および第1入力点に接続せしめ、い
くつかの検波出力が該しきい値を越えた場合は、あらか
じめ設定した優先順位に従って、該しきい値を越えた検
波出力のうち最も優先度の高い検波器に接続された干渉
波成分抽出用フィルタに対応する干渉波成分除去用フィ
ルタを選択し、第1スイッチの入力点および第2スイッ
チの出力点を該選択された干渉波成分除去用フィルタに
接続せしめるように構成された帯域外干渉波除去装置。
4. A reception signal line from an antenna device is directly connected to an input point of a 1-input n-output (n is an integer of 2 or more) first switch, and a first output point of the first switch is n-input 1 It is connected to the first input point of the output second switch, and the second output point to the nth output point of the first switch have different pass characteristics and have a boundary portion with an adjacent band in the assigned frequency band. The n-1 interference wave component removal filters that are attenuation regions are connected in parallel to each input point of the filter group, and each output point of the filter group is connected to the second input point to the nth input point of the second switch. Each connected to a point, the second
An output point of the switch is connected to a low noise amplifier of the receiving device, and an input side of the first switch, an output of the low noise amplifier or a received signal after frequency conversion is branched,
The branch signal is distributed to n−1 interference wave component extraction filters arranged in parallel so as to correspond to the n−1 interference wave component removal filters, respectively, A level determination circuit for determining the presence or absence of an interference wave by comparing the output of n-1 detectors respectively connected to the output side with a preset threshold value is provided, and all the detection outputs are When the voltage falls below the threshold value, the input point of the first switch and the output point of the second switch are connected to the first output point and the first input point, respectively, and when some detection outputs exceed the threshold value. , According to a preset priority order, selects an interference wave component removing filter corresponding to the interference wave component extracting filter connected to the detector having the highest priority among the detection outputs exceeding the threshold value, Configured out-of-band interference elimination device as allowed to connect the input point and output point of the second switch of the switch to the selected interference component removing filter.
JP30590492A 1992-10-21 1992-10-21 Out-band interference wave removing device Pending JPH06132838A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30590492A JPH06132838A (en) 1992-10-21 1992-10-21 Out-band interference wave removing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30590492A JPH06132838A (en) 1992-10-21 1992-10-21 Out-band interference wave removing device

Publications (1)

Publication Number Publication Date
JPH06132838A true JPH06132838A (en) 1994-05-13

Family

ID=17950704

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30590492A Pending JPH06132838A (en) 1992-10-21 1992-10-21 Out-band interference wave removing device

Country Status (1)

Country Link
JP (1) JPH06132838A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002271234A (en) * 2001-03-09 2002-09-20 Hitachi Kokusai Electric Inc Interference signal removal device
JP2007184990A (en) * 2007-04-02 2007-07-19 Sanyo Electric Co Ltd Signal receiving apparatus
JP2009152705A (en) * 2007-12-19 2009-07-09 Toshiba Corp Computer and switching circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002271234A (en) * 2001-03-09 2002-09-20 Hitachi Kokusai Electric Inc Interference signal removal device
JP4548954B2 (en) * 2001-03-09 2010-09-22 株式会社日立国際電気 Interference signal canceller
JP2007184990A (en) * 2007-04-02 2007-07-19 Sanyo Electric Co Ltd Signal receiving apparatus
JP2009152705A (en) * 2007-12-19 2009-07-09 Toshiba Corp Computer and switching circuit

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