JPH0326932B2 - - Google Patents
Info
- Publication number
- JPH0326932B2 JPH0326932B2 JP59095922A JP9592284A JPH0326932B2 JP H0326932 B2 JPH0326932 B2 JP H0326932B2 JP 59095922 A JP59095922 A JP 59095922A JP 9592284 A JP9592284 A JP 9592284A JP H0326932 B2 JPH0326932 B2 JP H0326932B2
- Authority
- JP
- Japan
- Prior art keywords
- interference
- output
- wave
- intermediate frequency
- input signal
- 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.)
- Expired - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims description 13
- 230000002194 synthesizing effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 235000016068 Berberis vulgaris Nutrition 0.000 description 1
- 241000335053 Beta vulgaris Species 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、周波数を共通利用する移動通信シス
テムにおいて、同一周波数干渉を検出し、その妨
害を回避する機能を有する無線伝送装置に使用す
る干渉量検出装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an interference amount detection method used in a wireless transmission device having a function of detecting co-frequency interference and avoiding the interference in a mobile communication system that uses frequencies in common. It is related to the device.
従来例の構成とその問題点
第１図は、従来の同一チヤネル干渉検出器付き
受信機の構成を示している。以下、この従来例に
ついて説明する。Configuration of a conventional example and its problems FIG. 1 shows the configuration of a conventional receiver with a co-channel interference detector. This conventional example will be explained below.
第１図において、１はアンテナであり、これに
より受信された被変調波は、高周波増幅器２によ
り増幅後、局発信号発振器４の出力とミキサ３で
混合し、中間周波信号をつくる。５は中間周波フ
イルタであり、目的の受信波を選択するためのも
のである。中間周波増幅器６で増幅し、入力信号
の強弱によらず一定振幅の中間周波信号が得られ
る様にする。７はFM検波回路であり、デイスク
リミネータで構成され、中間周波増幅器６の出力
をFM検波し、変調信号を復調する。８はFM雑
音改善のためのデイエンフアシス回路を含む帯域
波器である。９は音声帯域増幅器であり、帯域
波器８で帯域された復調信号を増幅し１０のス
ペーカを駆動する。１１は復調信号帯域を除去す
る帯域除去フイルタであり、同一チヤネルの被変
調波スペクトル間の干渉により発生するビート成
分をFM検波した成分を、復調信号と周波数的に
分離しようとするものであり、１２は整流回路で
これを検波し、１３はシユミツト回路であり、干
渉妨害があるレベル以上になつたことを判定する
ものである。 In FIG. 1, reference numeral 1 denotes an antenna, and a modulated wave received by the antenna is amplified by a high frequency amplifier 2, and then mixed with the output of a local oscillator 4 by a mixer 3 to generate an intermediate frequency signal. Reference numeral 5 denotes an intermediate frequency filter, which is used to select a target received wave. The intermediate frequency amplifier 6 amplifies the signal so that an intermediate frequency signal with a constant amplitude can be obtained regardless of the strength of the input signal. Reference numeral 7 denotes an FM detection circuit, which is composed of a discriminator, performs FM detection on the output of the intermediate frequency amplifier 6, and demodulates the modulated signal. 8 is a bandpass filter including a de-emphasis circuit for improving FM noise. Reference numeral 9 denotes an audio band amplifier, which amplifies the demodulated signal band-banded by the band waver 8 and drives the 10 speakers. Reference numeral 11 denotes a band removal filter that removes the demodulated signal band, which attempts to separate the FM-detected beat component generated by interference between modulated wave spectra of the same channel from the demodulated signal in terms of frequency. 12 is a rectifier circuit that detects this wave, and 13 is a Schmitt circuit that determines whether the interference has exceeded a certain level.
しかしながら、上記従来例においては、干渉検
出成分だけを復調信号から分離する帯域除去フイ
ルタ１１の構成が難しく、干渉の程度がひどい場
合にしか判定出来ない欠点があつた。 However, in the above-mentioned conventional example, it is difficult to configure the band-removal filter 11 that separates only the detected interference component from the demodulated signal, and the disadvantage is that it can only be determined when the degree of interference is severe.
発明の目的
本発明は、上記従来例の欠点を除去しようとす
るものであり、軽度の同一チヤネル干渉をも検出
すると共に、定量的に干渉度合を検出することに
より、チヤネル回避等、システム制御に利用する
ことを目的としたものである。Purpose of the Invention The present invention aims to eliminate the drawbacks of the conventional example, and is capable of detecting even mild same-channel interference and quantitatively detecting the degree of interference, thereby improving system control such as channel avoidance. It is intended for use.
発明の構成
本発明は上記目的を達成するために、中間周波
増幅器は対数レベル検出器を設け、その直流レベ
ルの比較的早い変動成分を抽出することにより、
同一チヤネル干渉量を検出するようにしたもので
あり、希望信号入力レベルによらず、干渉量に比
例した出力を得ることが出来るものである。Structure of the Invention In order to achieve the above object, the present invention provides an intermediate frequency amplifier with a logarithmic level detector, and extracts a relatively fast fluctuation component of the DC level.
It is designed to detect the amount of interference from the same channel, and it is possible to obtain an output proportional to the amount of interference regardless of the desired signal input level.
実施例の説明
以下に本発明の一実施例の構成について図面と
共に説明する。第２図において２０はリミツタ増
幅器より成る中間周波増幅器で、複数段の一定利
得の増幅器ａ，ｂ，ｃ……の縦続接続により成
り、中間周波信号を増幅すると共に、各段の結合
点等より複数組の出力２１ａ〜２１ｃが取り出せ
るようになつている。２２は出力２１ａ〜２１ｃ
を包絡線検波する検波回路で複数組のダイオード
２２ａ〜２２ｃにより構成されている。２３はダ
イオード２２ａ〜２２ｃの出力を加算合成する合
成器である。２４は抵抗Ｒと容量Ｃで構成した低
域通過波器、２５は低域通過波器２４の出力
を入力する帯域通過波器、２６は帯域通過波
器２５の出力を整流して同一チヤネル干渉レベル
監視端子２７に出力する整流回路、２８は低域通
過波器２４の出力を入力する低域通過波器で
あり、入力信号レベルの対数に比例する直流レベ
ルを端子２９に取り出すことが出来る。なお、低
域通過波器２５と帯域通過波器２６により帯
域波手段を構成する。他の第１図と同様な符号
は同一の名称を表わす。DESCRIPTION OF EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to the drawings. In Fig. 2, reference numeral 20 denotes an intermediate frequency amplifier consisting of a limiter amplifier, which consists of multiple stages of constant gain amplifiers a, b, c, etc. connected in cascade. A plurality of sets of outputs 21a to 21c can be taken out. 22 is the output 21a to 21c
This is a detection circuit that detects the envelope of the diodes 22a to 22c. 23 is a synthesizer that adds and synthesizes the outputs of the diodes 22a to 22c. 24 is a low-pass waver composed of a resistor R and a capacitor C, 25 is a band-pass waver that inputs the output of the low-pass waver 24, and 26 is a rectifier for the output of the band-pass waver 25 to produce same-channel interference. A rectifier circuit 28 that outputs to the level monitoring terminal 27 is a low-pass waver that inputs the output of the low-pass waver 24, and can output a DC level proportional to the logarithm of the input signal level to the terminal 29. Note that the low-pass wave device 25 and the band-pass wave device 26 constitute a band wave means. The same reference numerals as in other FIG. 1 represent the same names.
次に動作を説明する。中間周波増幅器２０の各
段の出力をそれぞれダイオード２２ａ〜２２ｃで
検波し、整流信号を合成器２３で合成することに
より入力信号強度に比例した直流出力（入力信号
レベル検波出力）を得ている。合成器２３の出力
を低域通過波器２４により中間周波成分を除去
している。例えば、リミツタ増幅器の各段の利得
を約10dBに選ぶことにより入力信号強度の対数
にほぼ比例した直流出力を得ることが出来る。も
し希望波の他にこれとほぼ同じ周波数の妨害波が
アンテナ１に到来するとミキサ３等によつて第３
図ａに示すビート成分が発生する。ビート成分は
FM被変調波にビート成分でAM変調がかかつた
ような波形をしており、中間周波数を扱う中間周
波増幅器２０の入力に到来する。 Next, the operation will be explained. The outputs of each stage of the intermediate frequency amplifier 20 are detected by diodes 22a to 22c, and the rectified signals are combined by a combiner 23 to obtain a DC output (input signal level detection output) proportional to the input signal strength. An intermediate frequency component of the output of the synthesizer 23 is removed by a low-pass wave filter 24. For example, by selecting the gain of each stage of the limiter amplifier to be approximately 10 dB, it is possible to obtain a DC output approximately proportional to the logarithm of the input signal strength. If, in addition to the desired wave, an interference wave with almost the same frequency arrives at antenna 1, it will be sent to antenna 1 by mixer 3, etc.
The beat component shown in Figure a is generated. The beet ingredient is
It has a waveform similar to that of an FM modulated wave subjected to AM modulation using a beat component, and arrives at the input of an intermediate frequency amplifier 20 that handles intermediate frequencies.
このため中間周波増幅器２０、ダイオード２
２、合成器２３、低域通過波器２３で構成され
る入力信号強度対数比例検出回路の出力には、ビ
ート成分の包絡線の振幅の対数に比例した信号
が、第３図ｂに示すように入力信号強度対数出力
直流電圧（同図破線に示す）に重畳して得られ
る。 Therefore, the intermediate frequency amplifier 20, the diode 2
2. At the output of the input signal strength logarithm proportionality detection circuit composed of the synthesizer 23 and the low-pass wave generator 23, a signal proportional to the logarithm of the amplitude of the envelope of the beat component is output as shown in FIG. 3b. It is obtained by superimposing the input signal strength logarithmically on the output DC voltage (shown by the broken line in the figure).
なお、低域通過波器２４の出力には前述の通
り、フエージングに基づくレベル変動成分（ほぼ
100Hz以下）と同一チヤネル干渉に基づくビート
成分、隣接チヤネル干渉によるビート成分（ほぼ
10KHz以上）が発生する可能性があるので、帯域
通過波器２５は、不要な信号を除去し、同一チ
ヤネル干渉に基づくビート成分のみを抽出するフ
イルタとする。 As mentioned above, the output of the low-pass wave filter 24 contains a level fluctuation component (approximately
100Hz or less), beat components based on same channel interference, and beat components due to adjacent channel interference (approximately
10KHz or higher), the bandpass wave generator 25 is a filter that removes unnecessary signals and extracts only the beat component based on the same channel interference.
２６は帯域通過波器２５で抽出したビート成
分を整流する整流回路であり、同一チヤネル干渉
レベル監視端子２７でこの直流レベルを監視する
ことにより、同一チヤネル干渉量を監視すること
が出来る。 Reference numeral 26 denotes a rectifier circuit that rectifies the beat component extracted by the bandpass wave generator 25. By monitoring this DC level with the same channel interference level monitoring terminal 27, the amount of same channel interference can be monitored.
干渉量検出の原理を以下に説明する。 The principle of interference amount detection will be explained below.
希望波：e1＝A1sinω1t 妨害波：e2＝A2sinω2t とすると、その合成波ｅは次の様になる。 Desired wave: e 1 =A 1 sinω 1 t Interfering wave: e 2 =A 2 sinω 2 t Then, the composite wave e is as follows.
希望波e1がFM変調波である場合には位相撹乱
項である
tan-1（A2sin（ｔ）／A1＋A2cos（ｔ））
が干渉雑音となる。 When the desired wave e 1 is an FM modulated wave, the phase disturbance term tan −1 (A 2 sin(t)/A 1 +A 2 cos(t)) becomes interference noise.
合成波ｅの振幅を対数検波するとその出力
（Ｅ）は
ここでA1≫A2とすると
ＥlogA1＋（A2／A1）cos（ｔ）
となる。 When the amplitude of the composite wave e is logarithmically detected, the output (E) is Here, if A 1 >>A 2 , then ElogA 1 + (A 2 /A 1 )cos(t).
第１項のlogA1は入力信号強度の対数比例成分
であり、dB表示の入力信号強度に比例する。第
２項は、干渉妨害に基づくビート成分であり、干
渉妨害比（A2／A1）に比例した振幅で現われる。
即ち、入力信号強度のいかんによらず、干渉妨害
比に比例した振幅のビート成分を得ることが出来
る。したがつて、このビート成分を整流すること
により、直ちに干渉妨害比を知ることが出来る。 The first term, logA 1 , is a logarithmically proportional component of the input signal strength, and is proportional to the input signal strength expressed in dB. The second term is a beat component based on interference and appears with an amplitude proportional to the interference ratio (A 2 /A 1 ).
That is, a beat component with an amplitude proportional to the interference/disturbance ratio can be obtained regardless of the input signal strength. Therefore, by rectifying this beat component, the interference/disturbance ratio can be immediately determined.
第４図に実施例の効果の一例を示す。図に示す
様に入力レベルによらず、干渉妨害比〔Ｄ／Ｕ
比〕にして約30dB程度までの検出ビート信号量
を検出出来る。 FIG. 4 shows an example of the effects of the embodiment. As shown in the figure, the interference ratio [D/U
It is possible to detect a detected beat signal amount of up to about 30 dB.
また、ビート整流回路１２を対数比例整流回路
とすることにより、干渉妨害比を連続的に知るこ
とが出来、きめ細かい制御も可能となることは云
うまでもない。 Furthermore, by making the beat rectification circuit 12 a logarithmic proportional rectification circuit, it goes without saying that the interference/disturbance ratio can be continuously known and fine control can be performed.
発明の効果
本発明は上記の様に、中間周波増幅器を定利得
の増幅器の縦続接続とし各段増幅器出力を包絡線
検波し、その出力を合成することにより入力信号
強度（対数）に比例した信号を得、この帯域通過
フイルタによりビート成分を取り出し、整流して
いるため、干渉妨害比に比例した直流電圧値を得
ることが出来る。従つてこの電圧を用いて、送信
出力の制御等に用いて、妨害回避等の制御を正確
に行なうことが出来る。Effects of the Invention As described above, the present invention uses an intermediate frequency amplifier connected in cascade of constant gain amplifiers, performs envelope detection on the output of each stage amplifier, and synthesizes the outputs to generate a signal proportional to the input signal strength (logarithm). Since the beat component is extracted and rectified using this band-pass filter, it is possible to obtain a DC voltage value proportional to the interference/disturbance ratio. Therefore, this voltage can be used to control transmission output, etc., to accurately control interference avoidance, etc.
第１図は従来の干渉量検出装置の構成例を示す
ブロツク図、第２図は本発明の一実施例における
干渉量検出装置のブロツク図、第３図は第２図の
構成における動作を説明するための波形図、第４
図は第２図の構成による特性の一例を示す図であ
る。
２０……中間周波増幅器、２２……検波回路、
２３……合成器、２４……低域通過波器、２５
……帯域通過波器、２６……整流回路。
FIG. 1 is a block diagram showing an example of the configuration of a conventional interference amount detection device, FIG. 2 is a block diagram of an interference amount detection device according to an embodiment of the present invention, and FIG. 3 explains the operation of the configuration of FIG. 2. Waveform diagram for
The figure is a diagram showing an example of the characteristics according to the configuration of FIG. 2. 20...Intermediate frequency amplifier, 22...Detection circuit,
23...Synthesizer, 24...Low pass wave generator, 25
... Bandpass wave generator, 26 ... Rectifier circuit.
Claims (1)
し各段の出力を検波回路により包絡線検波しこれ
を合成器により加算合成することにより、入力信
号入力振幅の対数に比例した電圧を得る手段と、
前記合成器の出力よりビート成分を抽出する帯域
波手段と、この帯域波手段の出力を整流する
整流手段とを有することを特徴とする干渉量検出
装置。1 Means for obtaining a voltage proportional to the logarithm of the input amplitude of an input signal by cascading the intermediate frequency amplifier with constant gain amplifiers, detecting the envelope of the output of each stage using a detection circuit, and adding and synthesizing the results using a synthesizer;
An interference amount detection device comprising: band wave means for extracting a beat component from the output of the synthesizer; and rectification means for rectifying the output of the band wave means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59095922A JPS60239139A (en) | 1984-05-14 | 1984-05-14 | Device for detecting quantity of interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59095922A JPS60239139A (en) | 1984-05-14 | 1984-05-14 | Device for detecting quantity of interference |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60239139A JPS60239139A (en) | 1985-11-28 |
| JPH0326932B2 true JPH0326932B2 (en) | 1991-04-12 |
Family
ID=14150768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59095922A Granted JPS60239139A (en) | 1984-05-14 | 1984-05-14 | Device for detecting quantity of interference |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60239139A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6251845A (en) * | 1985-08-31 | 1987-03-06 | Nec Corp | Interference detector |
| JP4698383B2 (en) | 2004-10-26 | 2011-06-08 | パナソニック株式会社 | Wireless terminal device, management terminal device, and terminal management method |
-
1984
- 1984-05-14 JP JP59095922A patent/JPS60239139A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60239139A (en) | 1985-11-28 |
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