JP3301469B2 - Signal transmission equipment - Google Patents
Signal transmission equipmentInfo
- Publication number
- JP3301469B2 JP3301469B2 JP01578595A JP1578595A JP3301469B2 JP 3301469 B2 JP3301469 B2 JP 3301469B2 JP 01578595 A JP01578595 A JP 01578595A JP 1578595 A JP1578595 A JP 1578595A JP 3301469 B2 JP3301469 B2 JP 3301469B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- signal
- optical
- base station
- transmission line
- 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
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- Optical Communication System (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、変調された電気信号
を電気−光変換器により光信号に変換し、これを光ファ
イバのような光伝送路を通じて、伝送する信号伝送装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal transmission apparatus for converting a modulated electric signal into an optical signal by an electro-optical converter and transmitting the optical signal through an optical transmission line such as an optical fiber.
【０００２】[0002]
【従来の技術】図７に従来の移動通信における上り回線
（無線基地局Ａから集中基地局Ｂへの信号伝送方向）の
構成例を示す。上り回線において、セルＤに存在する複
数の移動端末Ｃ-1〜Ｃ-nから送信された無線信号は、こ
のセルＤを受け持つ無線基地局Ａのアンテナ１で受信さ
れ、増幅器４を経て電気−光変換器５に入力され、電気
−光変換器５で一括して光信号に変換され光伝送路６を
通じて集中基地局Ｂへ伝送される。尚、受信信号を周波
数変換器１６により低い周波数に変換し、集中基地局Ｂ
に光伝送する場合もある。集中基地局Ｂでは光伝送路６
から出射される光信号を光−電気変換器７で電気信号に
変換し、この電気信号を復調器８-1…８-nで復調し、イ
ンターフェース９に取込まれる。このように無線基地局
Ａと集中基地局Ｂとの間を光伝送路６で接続する理由
は、光伝送路が同軸伝送路より広帯域信号を伝送できる
からである。2. Description of the Related Art FIG. 7 shows a configuration example of an uplink (signal transmission direction from a radio base station A to a centralized base station B) in conventional mobile communication. In the uplink, the radio signals transmitted from the plurality of mobile terminals C-1 to C-n existing in the cell D are received by the antenna 1 of the radio base station A serving the cell D, and are transmitted through the amplifier 4 to The signal is input to the optical converter 5, is collectively converted into an optical signal by the electro-optical converter 5, and is transmitted to the centralized base station B through the optical transmission line 6. Note that the received signal is converted to a lower frequency by the frequency converter 16 and
In some cases, optical transmission is performed. In the centralized base station B, the optical transmission line 6
Is converted into an electric signal by the optical-electrical converter 7, and the electric signal is demodulated by the demodulators 8-1... The reason why the wireless base station A and the centralized base station B are connected by the optical transmission line 6 is that the optical transmission line can transmit a wider band signal than the coaxial transmission line.
【０００３】[0003]
【発明が解決しようとする課題】図７において、上り回
線のダイナミックレンジは光伝送路のキャリア・ノイズ
・レシオ特性（以下ＣＮＲ特性と称す）および歪特性に
より制限される。光伝送路６のＣＮＲ特性を改善するた
めに増幅器４のゲインを大きくすると、光伝送路６の雑
音特性は改善される。然し乍ら振幅の増大に伴なって電
気−光変換器５の非線形性により発生する３次相互変調
歪成分や高調波歪成分のレベルが高くなり、図８で示す
ように、光伝送路６を通過後の光−電気変換器７の出力
側において、歪成分Ｄ1 ，Ｄ2 …Ｄi が発生する周波数
２ｆ1 −ｆ2 ，２ｆ2 −ｆ1 ，２ｆ1 等と重畳する信号
（図の例ではＳ3 ，Ｓi ）の品質が劣化するという問題
があった。尚、図８に示すＳ1 〜Ｓn は移動端末Ｃ-1…
Ｃ-nから送られて来た受信信号成分を示す。In FIG. 7, the dynamic range of the uplink is limited by the carrier noise ratio characteristic (hereinafter referred to as CNR characteristic) and the distortion characteristic of the optical transmission line. When the gain of the amplifier 4 is increased to improve the CNR characteristic of the optical transmission line 6, the noise characteristic of the optical transmission line 6 is improved. However, as the amplitude increases, the level of the third-order intermodulation distortion component and harmonic distortion component generated by the non-linearity of the electro-optical converter 5 increases, and as shown in FIG. light after - at the output side of the electrical converter 7, the signal (Fig overlapping with distortion component D 1, D 2 ... D i frequency 2f 1 -f 2 that occurs, 2f 2 -f 1, 2f 1, etc. examples Then, there was a problem that the quality of S 3 , S i ) deteriorated. Incidentally, S 1 to S n shown in FIG. 8 is mobile terminal C-1 ...
This shows a received signal component sent from C-n.
【０００４】この発明は光伝送路の歪成分による信号劣
化を回避することで、光伝送路のＣＮＲ特性、歪特性を
改善し、上り回線のダイナミックレンジを改善する事を
目的とする。An object of the present invention is to improve the CNR characteristic and the distortion characteristic of an optical transmission line and to improve the dynamic range of an uplink by avoiding signal deterioration due to a distortion component of the optical transmission line.
【０００５】[0005]
【課題を解決するための手段】この発明は、無線基地局
において複数の移動端末からの相異なる周波数の無線信
号を各搬送波ごとに抽出分離し、各信号をお互いの３次
相互変調歪及び高調波歪が干渉しない周波数配置に周波
数変換した後、集中基地局まで光伝送することを特徴と
する。SUMMARY OF THE INVENTION This invention, radio signals having different frequencies from a plurality of mobile terminals extracted and separated for each carrier in the radio base station, the third-order intermodulation Ibitsu及 beauty each other each signal After frequency conversion to a frequency arrangement where harmonic distortion does not interfere, optical transmission is performed to a centralized base station.
【０００６】[0006]
【作用】従ってこの発明によれば、各信号をお互いの３
次相互変調歪、高調波歪が干渉しない周波数配置に周波
数変換したから、これらの歪による信号劣化を回避する
事が可能となる。また各信号をお互いの３次相互変調
歪、高調波歪が干渉しない周波数配置に周波数変換した
から、３次相互変調歪、高調波歪のレベルが高くなって
も信号に影響が与えられることはない。この結果電気−
光変換器への信号入力を高く設定できる。従って、光伝
送路の歪特性とＣＮＲ特性はともに改善され、上り回線
のダイナミックレンジを拡大することができる。Therefore, according to the present invention, each signal is divided into three signals.
Next intermodulation distortion, because the harmonic distortion is frequency converted to a frequency arrangement that does not interfere, it is possible to avoid the signal degradation due to these distortions. In addition, each signal is mutually tertiary intermodulated
Since the frequency is converted to a frequency arrangement in which the distortion and harmonic distortion do not interfere, the signal is not affected even if the level of the third-order intermodulation distortion or harmonic distortion increases. As a result, electricity
The signal input to the optical converter can be set high. Therefore, both the distortion characteristic and the CNR characteristic of the optical transmission line are improved, and the dynamic range of the uplink can be expanded.
【０００７】[0007]
【実施例】図１はこの発明の一実施例を示す。図７と対
応する部分には同一符号を付して示す。セルＤに包含さ
れる移動端末Ｃ-1…Ｃ-nから発信される電波は、このセ
ルＤを受け持つ無線基地局Ａのアンテナ１に受信され、
無線基地局Ａに設けられた増幅器４で増幅され、電気−
光変換器５で光信号に変換され、光伝送路６を通じて集
中基地局Ｂに送られる構成は従来の技術の説明と同じで
ある。FIG. 1 shows an embodiment of the present invention. Parts corresponding to those in FIG. 7 are denoted by the same reference numerals. The radio waves transmitted from the mobile terminals C-1... Cn included in the cell D are received by the antenna 1 of the radio base station A serving the cell D,
Amplified by the amplifier 4 provided in the radio base station A,
The configuration converted into an optical signal by the optical converter 5 and sent to the centralized base station B via the optical transmission line 6 is the same as that described in the conventional technique.
【０００８】この発明の特徴とする構成は、無線基地局
Ａに信号抽出回路２と、周波数変換回路３を設けた点で
ある。信号抽出回路２は各端末Ｃ-1，Ｃ-2…Ｃ-nから送
られて来る相異なる周波数の無線信号を１搬送波成分に
分離する動作を行なう。このために信号抽出回路２は例
えば図２に示すように、この無線基地局Ａに割当られた
通話可能なチャネル数の数のミキサ１０-1，１０-2…１
０-nと、このミキサ１０-1，１０-2…１０-nに周波数分
離用の周波数を持つ発振信号を与えるシンセサイザ１１
-1，１１-2…１１-nと、ミキサ１０-1，１０-2…１０-n
で周波数混合された信号の中の目的の周波数の信号だけ
を抽出するバンドパスフィルタ１２-1，１２-2…１２-n
と、シンセサイザ１１-1，１１-2…１１-nを起動停止及
び発振周波数の制御を行なうシンセサイザ制御器１７と
によって構成することができる。A feature of the present invention is that a signal extraction circuit 2 and a frequency conversion circuit 3 are provided in the radio base station A. The signal extraction circuit 2 performs an operation of separating radio signals of different frequencies sent from the terminals C-1, C-2,... Cn into one carrier component. For this purpose, as shown in FIG. 2, for example, the signal extraction circuit 2 determines the number of mixers 10-1, 10-2,... 1 corresponding to the number of talkable channels assigned to the radio base station A.
0-n, and a synthesizer 11 for providing an oscillation signal having a frequency for frequency separation to the mixers 10-1, 10-2,.
-1, 11-2... 11-n and mixers 10-1, 10-2.
Band-pass filters 12-1, 12-2,..., 12-n for extracting only the signal of the target frequency from the signals frequency-mixed by
, 11-n, and the synthesizer controller 17 that controls the start and stop of the oscillators and the control of the oscillation frequency.
【０００９】アンテナ１には移動端末から送られて来る
相異なる周波数の無線信号Ｓ1 ，Ｓ2 ，Ｓ3 …Ｓn が受
信される。通話状況により例えばミキサ１０-1に無線信
号Ｓ1 を抽出する役割が割り当られたとすると、シンセ
サイザ１１-1は無線信号Ｓ1を抽出するための周波数で
発振し、その周波数混合信号をバンドパスフィルタ１２
-1に与える。つまり、シンセサイザ制御器１７からの信
号によりバンドパスフィルタ１２-1の中心周波数に周波
数混合信号の周波数が合致するように、シンセサイザ１
１-1の発振周波数が制御される。このようにして、各バ
ンドパスフィルタ１２-1，１２-2…１２-nからは各移動
端末に割り当てられた１変調波がそれぞれ出力される。 [0009] The antenna 1 is sent from a mobile terminal.
Different radio signals S 1 of the frequency, S 2, S 3 ... S n is received. If the role of extracting the radio signal S 1 is assigned to the mixer 10-1 according to the call situation, for example, the synthesizer 11-1 oscillates at the frequency for extracting the radio signal S 1 and converts the frequency-mixed signal into a band-pass signal. Filter 12
Give to -1. That is, the signal from the synthesizer controller 17 is used so that the frequency of the frequency-mixed signal matches the center frequency of the band-pass filter 12-1 by the signal from the synthesizer controller 17.
The oscillation frequency of 1-1 is controlled. In this way, each movement from each band-pass filter 12-1, 12-2,.
One modulated wave assigned to the terminal is output.
【００１０】周波数分離された搬送波成分は周波数変換
回路３に入力され、周波数変換回路３において３次相互
変調歪及び高調波に干渉されない周波数に周波数変換す
る。このためにはこの周波数変換回路３にも図３に示す
ように複数のミキサー１３-1，１３-2…１３-nを設け、
このミキサ１３-1，１３-2…１３-nに局部発振器１４-
1，１４-2…１４-nから局部発振信号を与え周波数変換
する。[0010] carrier component that is frequency separated is input to the frequency conversion circuit 3 is frequency-converted to a frequency that is not interfering with the third-order intermodulation Ibitsu及 beauty harmonics in the frequency conversion circuit 3. For this purpose, the frequency conversion circuit 3 is also provided with a plurality of mixers 13-1, 13-2 ... 13-n as shown in FIG.
The mixers 13-1, 13-2,.
A local oscillation signal is given from 1, 14-2,.
【００１１】この周波数変換回路３によって周波数変換
後の信号の周波数は図５に示すように３次相互変調歪及
び高調波歪Ｄ 1 ，Ｄ 2 ，Ｄ i に干渉されない周波数Ｆ
1 ，Ｆ2 ，Ｆ3 …Ｆi …Ｆn に設定され、その周波数Ｆ
1 ，Ｆ2 ，Ｆ3 …Ｆi …Ｆn の信号Ｓ1 ，Ｓ2 ，Ｓ3 …
Ｓi …Ｓn はバンドパスフィルタ１５-1，１５-2…１５
-nを通じて取出され、合成されて増幅器４に入力され、
電気−光変換器５で光信号に変換されて集中基地局Ｂに
伝送される。 The frequency of the signal after frequency conversion by the frequency conversion circuit 3 is caused by third-order intermodulation distortion as shown in FIG.
F that is not interfered with by the harmonic distortions D 1 , D 2 , and D i
1, F 2, F 3 ... is set to F i ... F n, the frequency F
1 , F 2 , F 3 ... F i ... F n signals S 1 , S 2 , S 3 .
S i ... S n is the band-pass filter 15-1, 15-2 ... 15
-n, and are combined and input to the amplifier 4,
The signal is converted into an optical signal by the electric-optical converter 5 and transmitted to the centralized base station B.
【００１２】ここで相互に干渉しない周波数Ｆ1 ，Ｆ
2 ，Ｆ3 …Ｆi …Ｆn の選定方法について説明する。図
４に示すように、システムの下限チャネルの周波数をｆ
L 、チャネル間隔をΔｆ、ｎ番目のチャネルの周波数を
ｆn,ｍ番目のチャネルの周波数（システムの上限の周波
数）をｆm とすると、 ｆn ＝ｆL ＋（ｎ−１）Δｆ ３次高調波歪による干渉を避ける周波数配置の条件、 ２ｆi −ｆj ≠ｆn （ｉ，ｊ，ｎ＝１〜ｍ，ｉ≠ｊ） …(1) ｆi ＋ｆj −ｆk ≠ｆn （ｉ，ｊ，ｋ，ｎ＝１〜ｍ，ｉ≠ｊ,k, ｊ≠ｋ）…(2) 高調波歪の干渉を避ける周波数配置の条件（２，３，…
Ｓ倍高調波まで考慮） ｉ×ｆj ≠ｆn （ｉ＝２〜ｓ，ｊ，ｎ＝１〜ｍ，ｊ≠ｍ） …(3) （１），（２），（３）式を満足する周波数の組合せを
求める。Here, frequencies F 1 and F that do not interfere with each other
2, F 3 ... F i ... Selection method F n will be described. As shown in FIG. 4, the frequency of the lower limit channel of the system is f
L, and channel spacing Delta] f, the n-th frequency channel f n, the m-th channel frequency (frequency of the system limit) and f m, f n = f L + (n-1) Δf 3 primary Condition of frequency arrangement to avoid interference due to harmonic distortion, 2f i −f j ≠ f n (i, j, n = 1 to m, i ≠ j) (1) f i + f j −f k ≠ f n ( i, j, k, n = 1 to m, i ≠ j, k, j ≠ k) (2) Frequency arrangement conditions (2, 3,... to avoid interference of harmonic distortion)
I × f j ≠ f n (i = 2 to s, j, n = 1 to m, j ≠ m) (3) Equations (1), (2) and (3) Find a combination of frequencies that satisfies.
【００１３】上記した条件を満す周波数の一例としては
３チャネルの場合、１００ＭＨｚ，１５０ＭＨｚ，３５
０ＭＨｚである。また４チャネルの場合は、１００ＭＨ
ｚ，１５０ＭＨｚ，３５０ＭＨｚ，４１０ＭＨｚ等が考
えられる。移動端末Ｃ-1，Ｃ-2…Ｃ-nの周波数が予め決
められて固定されている場合にはミキサ１０-1〜１０-n
及びシンセサイザ１１-1〜１１-nは不要となり、単にバ
ンドパスフィルタ１２-1〜１２-nを移動端末が使用する
周波数の数だけ用意すればよい。An example of a frequency satisfying the above conditions is 100 MHz, 150 MHz, 35
0 MHz. In the case of 4 channels, 100 MH
z, 150 MHz, 350 MHz, 410 MHz, and the like. Mobile terminals C-1, when the frequency of the C-2 ... C-n are fixed to predetermined mixer 10-1 to 10-n
In addition, the synthesizers 11-1 to 11-n become unnecessary, and the bandpass filters 12-1 to 12-n may be simply prepared for the number of frequencies used by the mobile terminal.
【００１４】図６はこの発明の変形実施例を示す。この
例ではダイバーシチ受信の場合を示す。ダイバーシチ受
信の場合は、メインアンテナ１とサブアンテナ１′とを
有し、この２つのアンテナ１と１′に対して信号抽出回
路２，２′と、周波数変換回路３，３′及び復調器８-1
〜８-n及び８-1′〜８-n′を設けることにより、図１に
示した実施例と同様の作用効果を得ることができる。FIG. 6 shows a modified embodiment of the present invention. This example shows a case of diversity reception. For diversity reception, 'and a, the two antennas 1 and 1' the main antenna 1 and the sub antenna 1 signal extraction times with respect to
'And, the frequency converting circuit 3, 3' road 2,2 and demodulator 8-1
By providing .about.8-n and 8-1 'to 8-n', the same operation and effect as in the embodiment shown in FIG. 1 can be obtained.
【００１５】[0015]
【発明の効果】以上説明したように、この発明によれ
ば、互いに異なる周波数の複数の信号を電気−光変換器
５で光信号に変換し、光伝送路６を介して集中基地局Ｂ
に信号を伝送する場合において、各信号を３次相互変調
歪及び高調波歪が発生する周波数以外の周波数に変換す
ることによって、電気−光変換器５の非線形性で発生す
る３次相互変調歪、或は高調波歪による信号の劣化を回
避することができ、歪特性を改善することができる。ま
た電気−光変換器５に与える信号のレベルを高めること
ができるから、光伝送路６におけるＣＮＲ特性をも改善
されるので、より一層回線のダイナミックレンジを改善
することが可能となり、より高い通信品質を実現でき
る。As described above, according to the present invention, a plurality of signals having mutually different frequencies are converted to an electro-optical converter.
5 and converts the signal to an optical signal.
In the case of transmitting signals to each other, each signal is tertiary intermodulated
To a frequency other than the frequency at which distortion and harmonic distortion occur.
Is generated by the nonlinearity of the electro-optical converter 5
That third-order intermodulation distortion, or it is possible to avoid the deterioration of the signal due to harmonic distortion, it is possible to improve the distortion characteristic. Further, since the level of the signal applied to the electro-optical converter 5 can be increased, the CNR characteristics in the optical transmission line 6 can be improved, so that the dynamic range of the line can be further improved, and higher communication can be achieved. Quality can be realized.
【図１】この発明の一実施例を示すブロック図。FIG. 1 is a block diagram showing one embodiment of the present invention.
【図２】図１に示した実施例に用いた周波数分離回路の
構成を説明するためのブロック図。FIG. 2 is a block diagram for explaining a configuration of a frequency separation circuit used in the embodiment shown in FIG.
【図３】図１に示した実施例に用いた周波数変換回路の
構成を説明するためのブロック図。FIG. 3 is a block diagram for explaining a configuration of a frequency conversion circuit used in the embodiment shown in FIG. 1;
【図４】この発明の要部の動作を説明するためのグラ
フ。FIG. 4 is a graph for explaining the operation of the main part of the present invention.
【図５】この発明によって設定した相互変調歪及び高調
波歪によって干渉されない周波数の関係を説明するため
のグラフ。Figure 5 is a graph for explaining the set intermodulation Ibitsu及 beauty harmonic distortion so therefore does not interfere frequency relationship by the present invention.
【図６】この発明の変形実施例を示すブロック図。FIG. 6 is a block diagram showing a modified embodiment of the present invention.
【図７】従来の技術を説明するためのブロック図。FIG. 7 is a block diagram for explaining a conventional technique.
【図８】従来の技術で発生する不都合を説明するための
グラフ。FIG. 8 is a graph for explaining inconvenience occurring in the related art.
１，１′ アンテナ ２，２′ 信号抽出回路 ３，３′ 周波数変換回路 ４ 増幅器 ５ 電気−光変換器 ６ 光伝送路 ７ 光−電気変換器 ８-1…８-n 復調器 ９ インターフェース Ａ 無線基地局 Ｂ 集中基地局Ｃ-1…Ｃ-n 移動端末 Ｄ １台の無線基地局がカバーするセル １０-1…１０-n ミキサ １１-1…１１-n シンセサイザ １２-1…１２-n バンドパスフィルタ １３-1…１３-n ミキサ １４-1…１４-n 局部発振器 １５-1…１５-n バンドパスフィルタ １６ 周波数変換器 １７ シンセサイザ制御器Reference Signs List 1, 1 'antenna 2, 2' signal extraction circuit 3, 3 'frequency conversion circuit 4 amplifier 5 electro-optical converter 6 optical transmission line 7 optical-electric converter 8-1 ... 8-n demodulator 9 interface A wireless Base station B Centralized base station C-1 ... Cn Mobile terminal D Cell covered by one radio base station 10-1 ... 10-n Mixer 11-1 ... 11-n Synthesizer 12-1 ... 12-n band 13-1 ... 13-n mixer 14-1 ... 14-n local oscillator 15-1 ... 15-n band pass filter 16 frequency converter 17 synthesizer controller
───────────────────────────────────────────────────── フロントページの続き (72)発明者 荒木 浩二郎 東京都千代田区内幸町１丁目１番６号 日本電信電話株式会社内 (56)参考文献 特開 平８−18616（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H04B 10/00 - 10/28 H04J 14/00 - 14/08 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Kojiro Araki 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP-A-8-18616 (JP, A) (58) Field surveyed (Int. Cl. 7 , DB name) H04B 10/00-10/28 H04J 14/00-14/08
Claims (1)
の無線信号を一波づつ出力する複数の移動端末と、 複数の前記無線信号を受信し、前期移動端末のそれぞれ
に対応する周波数で周波数多重された光信号を光伝送路
に出力する無線基地局と、 前記光伝送路から前記光信号を受信し、周波数毎に分離
して復調する集中基地局と、 を備えた信号伝送方式において、 前記無線基地局は、 受信した前記複数の前記無線信号にシンセサイザからの
信号をそれぞれ周波数混合し、その各混合出力をそれぞ
れ通過帯域の異なるバンドパスフィルタを通して目的の
周波数の信号をそれぞれ分離抽出する複数の周波数抽出
回路と、 前記各周波数抽出回路から分離出力される信号の搬送波
周波数を、互いに相互変調歪や高調波歪の干渉を受けな
い周波数に変換する複数の周波数変換回路と、 前記複数の周波数変換回路から取出して合成された信号
を電気−光変換する電気−光変換器と、 を有することを特徴とする信号伝送装置。1. A plurality of mobile terminals each outputting a radio signal of a carrier frequency of a different frequency one by one, and a plurality of the radio signals are received and frequency-multiplexed at frequencies corresponding to the respective mobile terminals. A radio base station that outputs an optical signal to an optical transmission line; and a centralized base station that receives the optical signal from the optical transmission line and separates and demodulates the signal for each frequency. The station transmits the plurality of received radio signals from a synthesizer.
Each signal is frequency-mixed, and each mixed output is
Through a bandpass filter with different passband
A plurality of frequency extraction circuits for separating and extracting signals of frequencies, respectively, a plurality of frequency conversion circuits for converting a carrier frequency of a signal separated and output from each of the frequency extraction circuits to a frequency that does not receive interference of intermodulation distortion or harmonic distortion with each other. A signal transmission device, comprising: a frequency conversion circuit; and an electro-optic converter that performs electro-optic conversion of a signal taken out from the plurality of frequency conversion circuits and synthesized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01578595A JP3301469B2 (en) | 1995-02-02 | 1995-02-02 | Signal transmission equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01578595A JP3301469B2 (en) | 1995-02-02 | 1995-02-02 | Signal transmission equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08213949A JPH08213949A (en) | 1996-08-20 |
| JP3301469B2 true JP3301469B2 (en) | 2002-07-15 |
Family
ID=11898494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01578595A Expired - Lifetime JP3301469B2 (en) | 1995-02-02 | 1995-02-02 | Signal transmission equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3301469B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024053044A1 (en) * | 2022-09-08 | 2024-03-14 | 日本電信電話株式会社 | Transmission device, reception device, communication system, transmission method, and reception method |
-
1995
- 1995-02-02 JP JP01578595A patent/JP3301469B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08213949A (en) | 1996-08-20 |
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