JPH08213949A - Signal transmission unit - Google Patents
Signal transmission unitInfo
- Publication number
- JPH08213949A JPH08213949A JP7015785A JP1578595A JPH08213949A JP H08213949 A JPH08213949 A JP H08213949A JP 7015785 A JP7015785 A JP 7015785A JP 1578595 A JP1578595 A JP 1578595A JP H08213949 A JPH08213949 A JP H08213949A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- signal
- base station
- optical
- 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.)
- Granted
Links
Landscapes
- Optical Communication System (AREA)
Abstract
(57)【要約】
【目的】 信号の品質劣化が少ない光伝送路を用いた信
号伝送装置を提案する。
【構成】 集中基地局Ｂと移動端末が無線基地局Ａを介
して接続され、相互通信を行なう移動通信に用いる信号
伝送装置において、無線基地局において複数の移動端末
が送られてくる周波数の異なる無線信号を１波毎に抽出
する信号抽出回路２と、抽出された各信号をお互いの３
次相互変調歪及び高調波歪の干渉を避ける周波数に変換
する周波数変換回路３を設け、この周波数変換回路で周
波数変換した無線信号を合成して電気−光変換器５によ
り光信号に変換し集中基地局に伝送する。
(57) [Summary] [Objective] To propose a signal transmission device using an optical transmission line with little signal quality deterioration. [Configuration] centralized base station B and the mobile terminal is connected via a wireless base station A, in the signal transmission apparatus for use in mobile communication for mutual communication, Oite plurality of mobile terminals to the base station
Extracts wireless signals with different frequencies sent by each wave
Signal extraction circuit 2 and the extracted signals to each other
Next, a frequency conversion circuit 3 for converting to a frequency that avoids the interference of intermodulation distortion and harmonic distortion is provided, and the radio signals frequency-converted by this frequency conversion circuit are combined and converted into an optical signal by the electro-optical converter 5 and concentrated. Transmit to base station.
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 device 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 an example of the configuration of an uplink (signal transmission direction from a radio base station A to a toll 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 in charge of the cell D, pass through the amplifier 4, and are electrically The signal is input to the optical converter 5, converted into an optical signal collectively by the electro-optical converter 5, and transmitted to the centralized base station B through the optical transmission line 6. The received signal is converted to a low frequency by the frequency converter 16, and the centralized base station B
In some cases, optical transmission is performed. In the centralized base station B, the optical transmission line 6
The optical signal emitted from the optical signal is converted into an electric signal by the optical-electrical converter 7, and this electric signal is demodulated by the demodulators 8-1 ... 8-n and taken into the interface 9. The reason why the wireless base station A and the toll base station B are connected by the optical transmission line 6 in this way is that the optical transmission line can transmit a wideband signal from 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 ，２ｆ 1 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。[Problems to be Solved by the Invention]
The dynamic range of the line is the carrier noise of the optical transmission line.
・ For ratio characteristics (hereinafter referred to as CNR characteristics) and distortion characteristics
More limited. To improve the CNR characteristics of the optical transmission line 6.
Therefore, if the gain of the amplifier 4 is increased, the optical transmission line 6
The sound characteristics are improved. However, as the amplitude increases,
Third-order intermodulation generated by the nonlinearity of the air-to-optical converter 5
The level of the distortion component and the harmonic distortion component becomes high, as shown in Fig. 8.
Output of the optical-electrical converter 7 after passing through the optical transmission line 6
Distortion component D1, D2... DiFrequency at which
2f1-F2, 2f2-F1, 2f 1Signal to be superposed
(S in the example in the figure3, Si) Quality is deteriorated
was there. In addition, S shown in FIG.1~ SnIs a mobile terminal C-1 ...
The received signal component sent from C-n is shown.
【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。It is an object of the present invention to improve the CNR characteristics and distortion characteristics of the optical transmission line by avoiding signal deterioration due to the distortion component of the optical transmission line, and to improve the dynamic range of the uplink.
【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周波数多重された無線信
号を各搬送波ごとに抽出分離し、各信号をお互いの３次
相互変調歪成分及び高調波歪成分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。According to the present invention, a radio base station extracts and separates frequency-multiplexed radio signals from a plurality of mobile terminals for each carrier, and separates each signal into a third-order intermodulation distortion component and It is characterized in that after frequency conversion into a frequency arrangement in which harmonic distortion components do not interfere, the optical transmission is performed to the 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
次相互変調歪成分、高調波歪成分が干渉しない周波数配
置に周波数変換したから、これらの歪成分による信号劣
化を回避する事が可能となる。また各信号をお互いの３
次相互変調歪成分、高調波歪成分が干渉しない周波数配
置に周波数変換したから、３次相互変調歪成分、高調波
歪成分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 transmitted to each other.
Since the frequency is converted into a frequency arrangement in which the next intermodulation distortion component and the harmonic distortion component do not interfere with each other, it is possible to avoid signal deterioration due to these distortion components. In addition, each signal is
Since the frequency is converted into a frequency arrangement in which the second intermodulation distortion component and the harmonic distortion component do not interfere with each other, the signal is not affected even if the levels of the third intermodulation distortion component and the higher harmonic distortion component increase. As a result, the signal input to the electro-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. The parts corresponding to those in FIG. 7 are designated by the same reference numerals. The radio waves transmitted from the mobile terminals C-1 ... C-n included in the cell D are received by the antenna 1 of the radio base station A in charge of the cell D,
It is amplified by the amplifier 4 provided in the radio base station A,
The configuration in which an optical signal is converted by the optical converter 5 and sent to the toll base station B through the optical transmission line 6 is the same as that of the conventional technique.
【０００８】この発明の特徴とする構成は、無線基地局
Ａに周波数分離回路２と、周波数変換回路３を設けた点
である。周波数分離回路２は各端末Ｃ-1，Ｃ-2…Ｃ-nか
ら送られて来る周波数多重化された無線信号を１搬送波
成分に分離する動作を行なう。このために周波数分離回
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（例えば全７７チャネル
中の３〜４チャネル）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。The characteristic feature of the present invention is that the radio base station A is provided with a frequency separation circuit 2 and a frequency conversion circuit 3. The frequency separation circuit 2 performs an operation of separating the frequency-multiplexed radio signal sent from each of the terminals C-1, C-2 ... C-n into one carrier component. For this purpose, the frequency separation circuit 2 has, for example, as shown in FIG. 10-2 ... 1
0-n and a synthesizer 11 for giving an oscillating signal having a frequency for frequency separation to the mixers 10-1, 10-2 ... 10-n
-1, 11-2 ... 11-n and mixers 10-1, 10-2 ... 10-n
Bandpass filters 12-1, 12-2 ... 12-n for extracting only the signals of the target frequency from the signals mixed in frequency
, And the synthesizer 11-1, 11-2, ... 11-n can be configured by the synthesizer controller 17 for starting / stopping and controlling the oscillation frequency.
【０００９】アンテナ１には移動端末から送られて来る
周波数多重化された無線信号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Ｓ 1 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１
２-1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
１１-1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から通話中
の１搬送波成分を分離して抽出する。The antenna 1 is sent from the mobile terminal
Frequency multiplexed radio signal S1, S2, S3... SnBut
Be received. Depending on the call status, for example, the mixer 10-1 can be wireless
Signal S1If the role of extracting
The synthesizer 11-1 is a radio signal S 1Frequency for extracting
Oscillates with the frequency mixed signal and the band pass filter 1
Give to 2-1. In other words, from the synthesizer controller 17
Depending on the signal, the frequency around the bandpass filter 12-1 is selected.
Synthesizer so that the frequencies of the wave-mixed signals match.
The oscillation frequency of 11-1 is controlled. In this way, each
Calling from bandpass filters 12-1, 12-2 ... 12-n
1 carrier component of is separated and extracted.
【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
変調歪成分及び高調波成分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。The frequency-divided carrier component is input to the frequency conversion circuit 3, and the frequency conversion circuit 3 frequency-converts it into a frequency that does not interfere with the third-order intermodulation distortion component and the harmonic component. To this end, the frequency conversion circuit 3 also includes a plurality of mixers 13-1, 13-2 ... 13-n as shown in FIG.
, 13-n are provided with local oscillation signals from the local oscillators 14-1, 14-2, ... 14-n to perform frequency conversion.
【００１１】周波数変換回路３における周波数変換は信
号Ｓ1 ，Ｓ2 ，…Ｓn の周波数配置を変えるだけのわず
かなシフト幅の周波数変換である。この周波数変換によ
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
次相互変調歪成分Ｄ1 ，Ｄ2及び高調波成分Ｄi に干渉
されない周波数Ｆ1 ，Ｆ2 ，Ｆ3 …Ｆi …Ｆn に設定さ
れ、その周波数Ｆ1 ，Ｆ2 ，Ｆ3 …Ｆi …Ｆn の信号Ｓ
1 ，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 conversion in the frequency conversion circuit 3 is a frequency conversion with a slight shift width that only changes the frequency arrangement of the signals S 1 , S 2 , ... S n . By this frequency conversion, the frequency of the signal after frequency conversion is 3 as shown in FIG.
Is set to the next intermodulation distortion component D 1, the frequency does not interfere in the D 2 and harmonic components D i F 1, F 2, F 3 ... F i ... F n, the frequency F 1, F 2, F 3 ... F i ... F n of the signal S
1 , S 2 , S 3 ... S i ... S n are bandpass filters 15-
, 15-2 ... 15-n are taken out, combined, inputted to the amplifier 4, converted into an optical signal by the electro-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 ，
Ｆ2 ，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
ｆL 、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, the frequencies F 1 , which do not interfere with each other,
A method of selecting F 2 , F 3 ... F i ... F n will be described.
As shown in FIG. 4, assuming that the frequency of the lower limit channel of the system is f L , the channel interval is Δf, the frequency of the nth channel is f n, and the frequency of the mth channel (upper limit frequency of the system) is f m. , F n = f L + (n−1) Δf Frequency allocation condition for avoiding interference due to third 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~m, i ≠ j, k, j ≠ k) ... (2) frequency allocation to avoid interference of the harmonic distortion Conditions (2, 3, ...
Consider up to S-fold harmonics) i × f j ≠ f n (i = 2 to s, j, n = 1 to m, j ≠ m) (3) Equations (1), (2), and (3) Find the combination of frequencies that satisfy.
【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。尚、上述の実施例では多数のチャネル、例え
ば７７のチャネルに対し、実際に通話を可能とするチャ
ネル数を３〜４チャネルとし、通話に割当たチャネルの
無線信号の周波数をバンドパスフィルタ１２-1，１２-2
…１２-nの中の何れか一つの中心周波数に合致させるよ
うにシンセサイザ１１-1，１１-2…１１-nの発振周波数
を制御したが、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１０-1〜１
０-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。As an example of frequencies satisfying the above conditions, in the case of 3 channels, 100 MHz, 150 MHz, 35
It is 0 MHz. For 4 channels, 100 MH
z, 150 MHz, 350 MHz, 410 MHz, etc. are considered. In the above-described embodiment, the number of channels that can actually make a call is set to 3 to 4 for a large number of channels, for example, 77 channels, and the frequency of the radio signal of the channel assigned to the call is set to the bandpass filter 12-. 1, 12-2
The oscillation frequencies of the synthesizers 11-1, 11-2, ... 11-n are controlled so as to match any one of the center frequencies of 12-n, but the mobile terminals C-1, C-2, ... C- If the frequency of n is predetermined and fixed, the mixers 10-1 to 10-1
0-n and synthesizers 11-1 to 11-n are unnecessary, and it suffices to simply prepare the bandpass filters 12-1 to 12-n by 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′に対して単一受信の
場合の２倍のチャネルパス数を持つ周波数分離回路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 the case of diversity reception. In the case of diversity reception, it has a main antenna 1 and a sub-antenna 1 ', and the frequency separation circuit 2 having the number of channel paths that is twice as many as those in the case of single reception for these two antennas 1 and 1'.
2 ', frequency conversion circuits 3, 3', and demodulators 8-1 to 8-n
And 8-1 'to 8-n', the same effect as 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、周波数多重化された複数の信号を電気−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、信号相互間の周波数配置
を３次相互変調波成分及び高調波歪成分によって干渉さ
れない周波数に選定したから、電気−光変換器５の非線
形特性で発生する歪みつまり、３次高調波歪成分、或は
高調波歪成分が大きくなってもこれらの歪成分によって
信号が妨害を受けることがなく、光伝送路６の歪によっ
て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Ｃ
ＮＲ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 frequency-multiplexed signals are converted into electric-optical converters 5.
When the signal is converted into an optical signal by the above method, and the signal is transmitted to the centralized base station B through the optical transmission line 6, the frequency arrangement between the signals is selected to a frequency that does not interfere with the third-order intermodulation wave component and the harmonic distortion component. Therefore, even if the distortion generated by the non-linear characteristic of the electro-optical converter 5, that is, the third harmonic distortion component or the harmonic distortion component becomes large, the signal is not disturbed by these distortion components, It is possible to avoid signal deterioration due to distortion of the optical transmission line 6, and to improve distortion characteristics. Further, since the level of the signal given to the electro-optical converter 5 can be increased, C in the optical transmission line 6 can be increased.
Since the NR characteristic is also improved, it becomes possible to further improve the dynamic range of the line, and it is possible to realize higher communication quality.
【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 an 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 the 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 the configuration of a frequency conversion circuit used in the embodiment shown in FIG.
【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成分及び
高調波歪成分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。FIG. 5 is a graph for explaining the relationship between frequencies that are not interfered by the intermodulation distortion component and the harmonic distortion component set according to 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 an inconvenience that occurs in the conventional technique.
１，１′ アンテナ ２，２′ 周波数分離回路 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 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 Ｄ1 ，Ｄ2 ３次相互変調歪成分 Ｄi 高調波歪成分1, 1'antenna 2, 2'frequency separation circuit 3, 3'frequency conversion circuit 4 amplifier 5 electrical-optical converter 6 optical transmission line 7 optical-electrical converter 8-1 ... 8-n demodulator 9 interface A wireless Base station B Centralized base station 10-1 ... 10-n mixer 11-1 ... 11-n Synthesizer 12-1 ... 12-n Bandpass filter 13-1 ... 13-n Mixer 14-1 ... 14-n Local oscillator 15 -1 ... 15-n band pass filter 16 frequency converter 17 synthesizer controller D 1 , D 2 third-order intermodulation distortion component D i harmonic distortion component
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成７年４月２８日[Submission date] April 28, 1995
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】全文[Correction target item name] Full text
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【書類名】 明細書[Document name] Statement
【発明の名称】 信号伝送装置Signal transmission apparatus
【特許請求の範囲】[Claims]
【発明の詳細な説明】Detailed Description of the Invention
【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 device 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 an example of the configuration of an uplink (signal transmission direction from a radio base station A to a toll 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 in charge of the cell D, pass through the amplifier 4, and are electrically The signal is input to the optical converter 5, converted into an optical signal collectively by the electro-optical converter 5, and transmitted to the centralized base station B through the optical transmission line 6. The received signal is converted to a low frequency by the frequency converter 16, and the centralized base station B
In some cases, optical transmission is performed. In the centralized base station B, the optical transmission line 6
The optical signal emitted from the optical signal is converted into an electric signal by the optical-electrical converter 7, and this electric signal is demodulated by the demodulators 8-1 ... 8-n and taken into the interface 9. The reason why the wireless base station A and the toll base station B are connected by the optical transmission line 6 in this way is that the optical transmission line can transmit a wideband signal from 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 ，２ｆ 1 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。[Problems to be Solved by the Invention]
The dynamic range of the line is the carrier noise of the optical transmission line.
・ For ratio characteristics (hereinafter referred to as CNR characteristics) and distortion characteristics
More limited. To improve the CNR characteristics of the optical transmission line 6.
Therefore, if the gain of the amplifier 4 is increased, the optical transmission line 6
The sound characteristics are improved. However, as the amplitude increases,
Third-order intermodulation generated by the nonlinearity of the air-to-optical converter 5
The level of the distortion component and the harmonic distortion component becomes high, as shown in Fig. 8.
Output of the optical-electrical converter 7 after passing through the optical transmission line 6
Distortion component D1 , D2 ... DiFrequency at which
2f1 -F2 , 2f2 -F1 , 2f 1 Signal to be superposed
(S in the example in the figure3 , Si) Quality is deteriorated
was there. In addition, S shown in FIG.1 ~ SnIs a mobile terminal C-1 ...
The received signal component sent from C-n is shown.
【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。It is an object of the present invention to improve the CNR characteristics and distortion characteristics of the optical transmission line by avoiding signal deterioration due to the distortion component of the optical transmission line, and to improve the dynamic range of the uplink.
【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 It is characterized in that after frequency conversion into a frequency arrangement that does not interfere with harmonic distortion, optical transmission is performed to the toll 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 transmitted to each other.
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. Also, each signal is third-order intermodulated with each other.
Since the frequency is converted to a frequency arrangement in which the distortion and the harmonic distortion do not interfere with each other , even if the levels of the third-order intermodulation distortion and the harmonic distortion are increased, the signal is not affected. 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. The parts corresponding to those in FIG. 7 are designated by the same reference numerals. The radio waves transmitted from the mobile terminals C-1 ... C-n included in the cell D are received by the antenna 1 of the radio base station A in charge of the cell D,
It is amplified by the amplifier 4 provided in the radio base station A,
The configuration in which an optical signal is converted by the optical converter 5 and sent to the toll base station B through the optical transmission line 6 is the same as that of 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 the radio base station A is provided with a signal extraction circuit 2 and a frequency conversion circuit 3. The signal extraction circuit 2 performs an operation of separating radio signals having different frequencies sent from the terminals C-1, C-2 ... C-n into one carrier component. As shown in the signal extraction circuit 2 for example 2 to this, mixer number of number assigned communicatable channels to the radio base station A 10-1 and 10-2 ... 1
0-n and a synthesizer 11 for giving an oscillating signal having a frequency for frequency separation to the mixers 10-1, 10-2 ... 10-n
-1, 11-2 ... 11-n and mixers 10-1, 10-2 ... 10-n
Bandpass filters 12-1, 12-2 ... 12-n for extracting only the signals of the target frequency from the signals mixed in frequency
, And the synthesizer 11-1, 11-2, ... 11-n can be configured by the synthesizer controller 17 for starting / stopping and controlling 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 ，Ｓ 2 ，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Ｓ 1 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。 The antenna 1 is sent from the mobile terminal
Of different frequenciesRadio signal S1 , S 2 , S3 ... SnReceived
Believed Depending on the call status, for example, the mixer 10-1 may receive wireless communication
No. S 1 If the role of extracting
The sizer 11-1 is a radio signal S1At the frequency for extracting
The band-pass filter 12 oscillates and mixes the frequency mixed signal.
Give to -1. That is, the signal from the synthesizer controller 17
Signal to the center frequency of the bandpass filter 12-1.
Synthesizer 1 so that the frequencies of the number-mixed signals match
The oscillation frequency of 1-1 is controlled. In this way, each
From the bandpass filters 12-1, 12-2 ... 12-nIs each move
One modulated wave assigned to each 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 mixer 13-1, 13-2, ... 13-n has a local oscillator 14-
A local oscillation signal is given from 1, 14-2 ... 14-n to perform frequency conversion.
【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Ｄ1 ，Ｄ2 ，Ｄi に干渉されない周波数Ｆ
1 ，Ｆ 2 ，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。[0011]This frequency conversion circuit 3Frequency conversion by
The frequency of the latter signal is the third-order intermodulation as shown in FIG.Distortion
And harmonic distortion D 1 , D 2 , D i Frequency F that is not interfered with
1 , F 2 , F3 ... Fi... FnSet to its frequency F
1 , F2 , F3 ... Fi... FnSignal S1 , S2 , S3 …
Si... SnIs a bandpass filter 15-1, 15-2 ... 15
-n is taken out, combined and input to the amplifier 4,
It is converted into an optical signal by the electro-optical converter 5 and is sent to the centralized base station B.
Is transmitted.
【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
A method of selecting 2 , F 3 ... F i ... F n will be described. As shown in FIG. 4, the frequency of the lower limit channel of the system is f
L , the channel interval is Δf, the frequency of the nth channel is f n, and the frequency of the mth channel (upper limit frequency of the system) is f m , then f n = f L + (n−1) Δf 3rd order A condition of frequency allocation for avoiding 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) Condition of frequency allocation (2, 3, ...) to avoid interference of harmonic distortion.
Consider up to S-fold harmonics) i × f j ≠ f n (i = 2 to s, j, n = 1 to m, j ≠ m) (3) Equations (1), (2), and (3) Find the combination of frequencies that satisfy.
【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。As an example of frequencies satisfying the above conditions, in the case of 3 channels, 100 MHz, 150 MHz, 35
It is 0 MHz. For 4 channels, 100 MH
z, 150 MHz, 350 MHz, 410 MHz, etc. are considered. Mobile terminals C-1, when the frequency of the C-2 ... C-n are fixed to predetermined mixer 10-1 to 10-n
Also, the synthesizers 11-1 to 11-n are unnecessary, and it is sufficient to simply prepare the bandpass filters 12-1 to 12-n by 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 the 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', it is possible to obtain the same effect as that of the embodiment shown in FIG.
【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 different frequencies are converted into electric-optical converters.
The optical signal is converted into an optical signal at 5, and the centralized base station B is transmitted through the optical transmission line 6.
3rd order intermodulation for each signal
Convert to a frequency other than the frequency at which distortion and harmonic distortion occur.
Generated by the non-linearity 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 given to the electro-optical converter 5 can be increased, the CNR characteristic in the optical transmission line 6 is also improved, so that the dynamic range of the line can be further improved and higher communication can be achieved. Quality can be achieved.
【図面の簡単な説明】[Brief description of drawings]
【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 an 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 the 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 the configuration of a frequency conversion circuit used in the embodiment shown in FIG.
【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 an inconvenience that occurs in the conventional technique.
【符号の説明】 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[Explanation of Codes] 1, 1'antenna 2, 2'signal extraction circuit 3, 3'frequency conversion circuit 4 amplifier 5 electric-optical converter 6 optical transmission line 7 optical-electrical converter 8-1 ... 8-n demodulation Device 9 Interface A Radio base station B Concentrated base station C-1 ... C-n Mobile terminal D Cell covered by one radio base station 10-1 ... 10-n Mixer 11-1 ... 11-n Synthesizer 12-1 12-n bandpass filter 13-1 13-n mixer 14-1 14-n local oscillator 15-1 15-n bandpass filter 16 frequency converter 17 synthesizer controller
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図１[Name of item to be corrected] Figure 1
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図１】 FIG.
【手続補正３】[Procedure 3]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図２[Name of item to be corrected] Figure 2
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図２】 [Fig. 2]
───────────────────────────────────────────────────── 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 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kojiro Araki 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation
Claims (1)
を介して接続されると共に、集中基地局と無線基地局を
光伝送路で接続する信号伝送装置において、 Ｂ．上記無線基地局に移動端末から送られて来る周波数
多重化された信号を各搬送波成分毎に分離する周波数分
離回路と、 Ｃ．この周波数分離回路で周波数分離した信号の搬送周
波数を相互変調歪成分及び高調波歪成分に干渉されない
周波数に変換する周波数変換回路と、を設けたことを特
徴とする信号伝送装置。1. A. First Embodiment In a signal transmission device in which a toll base station and a mobile terminal are connected via a radio base station, and the toll base station and the radio base station are connected by an optical transmission line, B. A frequency separating circuit for separating the frequency-multiplexed signal sent from the mobile terminal to the radio base station for each carrier component; And a frequency conversion circuit for converting a carrier frequency of a signal frequency-separated by the frequency separation circuit into a frequency that does not interfere with the intermodulation distortion component and the harmonic distortion component.
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 true JPH08213949A (en) | 1996-08-20 |
| JP3301469B2 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) |
Cited By (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
Cited By (2)
| 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 |
| JPWO2024053044A1 (en) * | 2022-09-08 | 2024-03-14 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3301469B2 (en) | 2002-07-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5067173A (en) | Microcellular communications system using space diversity reception | |
| US6535748B1 (en) | Wireless communication transceiver having a dual mode of operation | |
| US5530929A (en) | Homodyne receiver minimizing oscillator leakage | |
| US5987304A (en) | Repeater with variable bandwidth | |
| US6766178B1 (en) | RF architecture for cellular multi-band telephones | |
| JP3848445B2 (en) | Radio equipment compatible with multiple communication systems | |
| EP1225715B1 (en) | Transmitter, receiver, and method | |
| KR100988447B1 (en) | Wireless communication method and system for communicating between a plurality of wireless communication terminals | |
| US6308050B1 (en) | Dual band mobile phone using the same intermediate frequency for both bands | |
| JPH05327569A (en) | Diversity transmission / reception method | |
| KR20000070294A (en) | Receiver apparatus for two frequency bands | |
| JPH05252559A (en) | Diversity transmission / reception method | |
| US7076217B1 (en) | Integrated radio transceiver | |
| JPH02209025A (en) | Radio communication equipment | |
| EP1207627B1 (en) | An efficient GS;/DSC/UMTS (UTRA/FDD) RF transceiver architecture | |
| JPH08213949A (en) | Signal transmission unit | |
| JP3264415B2 (en) | Signal transmission method | |
| JP2002101032A (en) | Gap filler for digital terrestrial broadcasting | |
| JPH05244033A (en) | Dual-band radio communication device | |
| JPH06350537A (en) | Wireless signal optical transmission method and communication device using this method | |
| JP4088513B2 (en) | Millimeter-wave transmission / reception system, transmitter and receiver | |
| JPH06164427A (en) | Radio communication equipment | |
| JPH06188791A (en) | Diversity signal transmission system | |
| JP2593020B2 (en) | Wireless communication device | |
| JPH0818616A (en) | Multifrequency signal reception circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090426 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090426 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100426 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100426 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110426 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120426 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130426 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140426 Year of fee payment: 12 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| EXPY | Cancellation because of completion of term |