JPH0923209A - Signal transmitter - Google Patents
Signal transmitterInfo
- Publication number
- JPH0923209A JPH0923209A JP7170023A JP17002395A JPH0923209A JP H0923209 A JPH0923209 A JP H0923209A JP 7170023 A JP7170023 A JP 7170023A JP 17002395 A JP17002395 A JP 17002395A JP H0923209 A JPH0923209 A JP H0923209A
- Authority
- JP
- Japan
- Prior art keywords
- base station
- radio base
- frequency
- signal
- optical
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Mobile Radio Communication Systems (AREA)
- Optical Communication System (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、複数の移動端末
が、各無線ゾーンに設置された無線基地局を介して、該
無線基地局と光伝送路で接続された集中基地局に対して
信号の送受信を行う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 method in which a plurality of mobile terminals transmit signals via a radio base station installed in each radio zone to a centralized base station connected to the radio base station by an optical transmission line. The present invention relates to a signal transmission device for transmitting and receiving.
【０００２】[0002]
【従来の技術】複数の移動端末が、各無線ゾーンに設置
された無線基地局を介して、該無線基地局と光伝送路で
接続された集中基地局に対して信号の送受信を行う信号
伝送装置においては、各無線基地局に割り当てられる複
数の無線信号を周波数多重して、その周波数多重信号に
よって光強度変調を行うサブキャリア光多重（ＳＣＭ：
Subcarrier Multiplexing）が用いられている。2. Description of the Related Art Signal transmission in which a plurality of mobile terminals transmit and receive signals via a radio base station installed in each radio zone to a centralized base station connected to the radio base station by an optical transmission line. In an apparatus, a plurality of radio signals assigned to each radio base station are frequency-multiplexed, and subcarrier optical multiplexing (SCM: SCM:
Subcarrier Multiplexing) is used.
【０００３】図５は、従来の上記信号伝送装置の構成例
を示すブロック図である。この図において、Ｃは集中基
地局、Ｄは無線基地局である。集中基地局Ｃは、広域通
信回線に対する回線制御装置および変復調装置を有して
おり、該広域通信回線を介して、他の集中基地局と接続
されている。そして、上記集中基地局Ｃ内の変調器９−
ｉ（ｉ＝１，…，ｎ、以下同様）で変調された信号は、
周波数変換器１０−ｉで周波数変換された後、合波さ
れ、周波数多重信号となる。そして、該周波数多重信号
は、電気／光変換器８で光信号に変換され、光ファイバ
７を介して、無線基地局Ｄに伝送される。次に、該光信
号は、無線基地局Ｄ内の光／電気変換器６で周波数多重
信号に再変換され、分配器５によってｎ個の帯域通過フ
ィルタ４−Ｄｉに分配される。分配された各信号は、帯
域通過フィルタ４−Ｄｉによって所定の通過帯域の信号
のみが取り出される。取り出された信号は、周波数変換
器２６−Ｄｉによって無線周波数帯域に周波数変換さ
れ、高出力増幅器３−Ｄｉで増幅される。そして、それ
ぞれの高出力増幅器３−Ｄｉから出力されるｎ個の信号
は、結合器２２で結合された後、送受切替器２を介し
て、アンテナ１で移動端末へ送信される。FIG. 5 is a block diagram showing a configuration example of the above-mentioned conventional signal transmission device. In this figure, C is a toll base station and D is a radio base station. The centralized base station C has a line control device and a modulation / demodulation device for a wide area communication line, and is connected to another centralized base station via the wide area communication line. Then, the modulator 9- in the centralized base station C is
The signal modulated by i (i = 1, ..., N, and so on) is
After being frequency-converted by the frequency converter 10-i, they are multiplexed to form a frequency-multiplexed signal. Then, the frequency-multiplexed signal is converted into an optical signal by the electric / optical converter 8 and transmitted to the radio base station D via the optical fiber 7. Next, the optical signal is reconverted into a frequency-multiplexed signal by the optical / electrical converter 6 in the radio base station D, and distributed by the distributor 5 to the n band-pass filters 4-Di. From each of the distributed signals, only a signal in a predetermined pass band is extracted by the band pass filter 4-Di. The extracted signal is frequency-converted into a radio frequency band by the frequency converter 26-Di and amplified by the high output amplifier 3-Di. Then, the n signals output from the respective high-power amplifiers 3-Di are combined by the combiner 22, and then transmitted through the duplexer 2 to the mobile terminal by the antenna 1.
【０００４】一方、移動端末からの送信信号は、アンテ
ナ１で受信され、送受切替器２を介して、分配器２３に
よってｎ個の低雑音増幅器１１−Ｄｉに分配される。分
配された各信号は、周波数変換器２７−Ｄｉによって周
波数変換され、結合器１３で結合される。そして、結合
器１３が出力する周波数多重多重信号は、電気／光変換
器１４で光信号に変換され、光ファイバ１５を介して、
集中基地局Ｃへ伝送される。該光信号は、集中基地局Ｃ
内の光／電気変換器１６で電気信号に再変換され、ｎ個
の周波数変換器１９−ｉに分配される。分配された各信
号は、周波数変換器１９−ｉで周波数変換された後、復
調器１８−ｉによって復調される。On the other hand, a transmission signal from the mobile terminal is received by the antenna 1 and is distributed to the n low noise amplifiers 11-Di by the distributor 23 via the transmission / reception switch 2. The distributed signals are frequency-converted by the frequency converter 27-Di and combined by the combiner 13. Then, the frequency-multiplexed multiplexed signal output from the coupler 13 is converted into an optical signal by the electrical / optical converter 14, and is transmitted via the optical fiber 15 to
It is transmitted to the toll base station C. The optical signal is transmitted from the toll base station C.
It is reconverted into an electric signal by the optical / electrical converter 16 inside and is distributed to the n frequency converters 19-i. The distributed signals are frequency-converted by the frequency converter 19-i and then demodulated by the demodulator 18-i.
【０００５】次に、図６は、集中基地局Ｃが、複数の無
線ゾーンの無線基地局Ｄ−ｉと接続される場合におけ
る、従来の信号伝送装置の構成例を示すブロック図であ
る。この図において、各無線基地局Ｄ−ｉは、図５に示
した無線基地局Ｄと同じ構成を有する。この場合、集中
基地局Ｃと各無線基地局Ｄ−ｉとの間は、それぞれ個別
の光伝送路（Ｅ／Ｏ，Ｏ／Ｅ，光ファイバ）で接続され
る。Next, FIG. 6 is a block diagram showing a configuration example of a conventional signal transmission device when the toll base station C is connected to the radio base stations Di of a plurality of radio zones. In this figure, each radio base station D-i has the same configuration as the radio base station D shown in FIG. In this case, the centralized base station C and each radio base station D-i are connected by individual optical transmission lines (E / O, O / E, optical fiber).
【０００６】[0006]
【発明が解決しようとする課題】ところで、上記方式の
信号伝送装置においては、無線基地局の低消費電力化お
よび小型化が重要な課題となる。該無線基地局の低消費
電力化の一手段として高出力増幅器（ＨＰＡ）の低消費
電力化がある。しかし、図５に示した信号伝送装置にお
いては、高出力増幅器３−Ｄｉとアンテナ１との間に、
結合器２２と送受切換器２が配置されているので、高出
力増幅器３−Ｄｉの出力レベルについては、これらの部
品の挿入損失を勘案して設定する必要がある。特に、結
合器２２の挿入損失は、２波結合の場合においても約４
ｄＢであるので、該結合器２２が無い場合と比較する
と、該高出力増幅器は約２．５倍もの消費電力を必要と
する。このため、上述した従来の信号伝送装置において
は、無線基地局の低消費電力化および小型化が困難であ
る、という欠点があった。By the way, in the signal transmission apparatus of the above system, it is important to reduce the power consumption and the size of the radio base station. One means of reducing the power consumption of the radio base station is to reduce the power consumption of a high output amplifier (HPA). However, in the signal transmission device shown in FIG. 5, between the high-power amplifier 3-Di and the antenna 1,
Since the coupler 22 and the duplexer 2 are arranged, it is necessary to set the output level of the high power amplifier 3-Di in consideration of the insertion loss of these components. Especially, the insertion loss of the coupler 22 is about 4 even in the case of two-wave coupling.
Since it is in dB, the high power amplifier requires about 2.5 times the power consumption as compared with the case without the combiner 22. Therefore, the above-described conventional signal transmission device has a drawback that it is difficult to reduce the power consumption and the size of the radio base station.
【０００７】また、従来の信号伝送装置においては、図
６に示すように、複数の無線ゾーンのそれぞれに無線基
地局を設置する場合、集中基地局から各無線基地局に対
して個別に光伝送路を設ける必要があり、その敷設およ
び保守に多大の費用を要する、という欠点があった。Further, in the conventional signal transmission apparatus, as shown in FIG. 6, when a radio base station is installed in each of a plurality of radio zones, the centralized base station transmits light individually to each radio base station. There is a drawback in that it is necessary to provide a road, and laying and maintenance of the road requires a large amount of money.
【０００８】この発明は、このような背景の下になされ
たもので、無線基地局の低消費電力化および小型化を図
ると共に、少数の光伝送路で複数の無線基地局と集中基
地局との間を接続することができる信号伝送装置を提供
することを目的とする。The present invention has been made under such a background, and aims to reduce the power consumption and size of a radio base station, and to provide a plurality of radio base stations and a centralized base station with a small number of optical transmission lines. It is an object of the present invention to provide a signal transmission device capable of connecting the two.
【０００９】[0009]
【課題を解決するための手段】請求項１記載の発明は、
広域通信回線に対する回線制御装置および変復調装置を
有する集中基地局と、所定無線ゾーン内の移動端末に対
して無線信号を送受信する無線基地局とが光ファイバで
接続された構成の信号伝送装置において、前記集中基地
局は、前記光ファイバを接続する電気／光変換器および
光／電気変換器を具備し、前記無線基地局は、主無線基
地局と１つまたは複数の従無線基地局から構成されると
共に、前記主無線基地局は、前記移動端末に対して無線
信号を送受信するアンテナと、前記光ファイバを介し
て、前記集中基地局が出力する光信号を受信し、該光信
号を周波数多重信号に変換する光／電気変換器と、前記
主無線基地局の光／電気変換器が出力する周波数多重信
号を分配する分配器と、前記分配器が出力する周波数多
重信号から、所定周波数の１信号を分離する周波数分離
器と、前記主無線基地局の周波数分離器が分離した信号
を、前記主無線基地局のアンテナの送信信号に変換する
送信周波数変換器と、前記主無線基地局のアンテナが受
信した受信信号の周波数を変換する受信周波数変換器
と、前記主無線基地局および前記従無線基地局の受信周
波数変換器が出力する信号を周波数多重する結合器と、
前記結合器が出力する周波数多重信号を光信号に変換
し、前記光ファイバを介して、該光信号を前記集中基地
局へ送信する電気／光変換器とを具備し、前記従無線基
地局は、前記主無線基地局が無線信号を送受信している
移動端末とは異なる移動端末に対して無線信号を送受信
するアンテナと、前記分配器が出力する周波数多重信号
から、前記主無線基地局の周波数分離器が分離した無線
信号とは周波数の異なる１信号を分離する周波数分離器
と、前記従無線基地局の周波数分離器が分離した信号
を、前記従無線基地局のアンテナの送信信号に変換する
送信周波数変換器と、前記従無線基地局のアンテナが受
信した受信信号の周波数を変換する受信周波数変換器と
を具備し、前記主無線基地局の分配器と前記従無線基地
局の周波数分離器との間、および、前記従無線基地局の
受信周波数変換器と前記主無線基地局の結合器との間が
同軸ケーブルで接続されていることを特徴としている。According to the first aspect of the present invention,
In a signal transmission device having a configuration in which a centralized base station having a line control device and a modulation / demodulation device for a wide area communication line, and a wireless base station that transmits and receives a wireless signal to and from a mobile terminal within a predetermined wireless zone are connected by an optical fiber, The toll base station includes an electrical / optical converter and an optical / electrical converter that connect the optical fibers, and the radio base station includes a master radio base station and one or more slave radio base stations. In addition, the main radio base station receives an optical signal output from the centralized base station via an antenna for transmitting and receiving radio signals to and from the mobile terminal and the optical fiber, and frequency-multiplexes the optical signal. An optical / electrical converter for converting into a signal, a distributor for distributing the frequency-multiplexed signal output by the optical / electrical converter of the main radio base station, and a predetermined frequency from the frequency-multiplexed signal output by the distributor. A frequency separator for separating one number of signals, a transmission frequency converter for converting the signal separated by the frequency separator of the main radio base station into a transmission signal of an antenna of the main radio base station, and the main radio base station. A reception frequency converter that converts the frequency of the reception signal received by the antenna of the station, and a combiner that frequency multiplexes the signals output by the reception frequency converters of the main radio base station and the sub-radio base station,
An electrical / optical converter for converting the frequency-multiplexed signal output from the coupler into an optical signal and transmitting the optical signal to the toll base station via the optical fiber; A frequency of the main radio base station from an antenna that transmits and receives radio signals to and from a mobile terminal different from the mobile terminal that the main radio base station is transmitting and receiving radio signals from, and a frequency multiplexed signal output from the distributor. A frequency separator for separating one signal having a frequency different from that of the radio signal separated by the separator and a signal separated by the frequency separator for the slave wireless base station are converted into transmission signals for the antenna for the slave wireless base station. A transmission frequency converter and a reception frequency converter for converting the frequency of a reception signal received by the antenna of the slave radio base station, wherein the distributor of the main radio base station and the frequency separator of the slave radio base station With , And it is characterized in that between the coupler of the main radio base station and the reception frequency converter of the 従無 base station is connected by a coaxial cable.
【００１０】請求項２記載の発明は、請求項１記載の信
号伝送装置において、前記従無線基地局は、前記主無線
基地局が設置されている無線ゾーンとは異なる無線ゾー
ンに設置されていることを特徴としている。According to a second aspect of the present invention, in the signal transmission device according to the first aspect, the slave radio base station is installed in a radio zone different from a radio zone in which the master radio base station is installed. It is characterized by that.
【００１１】[0011]
§１．概要 本発明の特徴は、以下に示す２点である。 （１）無線基地局を、電気／光変換器，光／電気変換器
および送受信部を有する主無線基地局と、送受信部のみ
を有する１つまたは複数の従無線基地局とに分離し、主
無線基地局および各従無線基地局にそれぞれアンテナを
設ける。 （２）主無線基地局のみが集中基地局と光伝送路で接続
され、従無線基地局は主無線基地局と同軸ケーブルで接
続される。§1. Outline The features of the present invention are the following two points. (1) A radio base station is divided into a main radio base station having an electric / optical converter, an optical / electrical converter and a transceiver, and one or a plurality of slave radio base stations having only the transceiver, Antennas are provided in the wireless base station and each slave wireless base station. (2) Only the main wireless base station is connected to the centralized base station via the optical transmission line, and the slave wireless base station is connected to the main wireless base station by the coaxial cable.
【００１２】これにより、高出力増幅器とアンテナとの
間に結合器を設ける必要がなくなる。その結果、従来構
成と比較して高出力増幅器の出力レベルを該結合器の挿
入損失分だけ低減することができ、その分高出力増幅器
の消費電力を低減することができる。したがって、無線
基地局の低消費電力化および小型化を図ることができ
る。また、複数の無線ゾーンのそれぞれに無線基地局を
設置する場合、光伝送路は集中基地局と主無線基地局と
の間のみ設ければよく、従来構成と比較して必要とする
光伝送路数を削減できる。This eliminates the need for a coupler between the high power amplifier and the antenna. As a result, the output level of the high output amplifier can be reduced by the insertion loss of the coupler as compared with the conventional configuration, and the power consumption of the high output amplifier can be reduced accordingly. Therefore, it is possible to reduce the power consumption and the size of the wireless base station. In addition, when a wireless base station is installed in each of a plurality of wireless zones, an optical transmission line may be provided only between the centralized base station and the main wireless base station. The number can be reduced.
【００１３】§２．第１実施形態 以下、図面を参照して、この発明の第１実施形態につい
て説明する。図１は、この発明の第１実施形態による信
号伝送装置の構成を示すブロック図である。この図にお
いて、図５の各部に対応する部分には同一の符号を付
け、その説明を省略する。この図に示す信号伝送装置が
図５の信号伝送装置と異なる点は、移動端末と無線通信
を行う無線基地局が、主無線基地局Ａと従無線基地局Ｂ
−ｉとに分離されている点である。なお、以下、特に断
らない限り、ｉ＝１，…，ｎとする。但し、説明を明瞭
とするために、必要に応じて、”ｉ”の代わりに”１，
…，ｎ”と表記する。そして上記無線基地局群の中で、
主無線基地局Ａのみが、光／電気変換器６および電気／
光変換器１４を具備しており、該光／電気変換器６およ
び電気／光変換器１４を介して、光ファイバ７および１
５で集中基地局Ｃと接続されている。§2. First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a signal transmission device according to the first embodiment of the present invention. In this figure, parts corresponding to the respective parts in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted. The signal transmission device shown in this figure is different from the signal transmission device of FIG. 5 in that a radio base station that performs radio communication with a mobile terminal is a master radio base station A and a slave radio base station B.
-I and is separated. In the following description, i = 1, ..., N unless otherwise specified. However, in order to clarify the explanation, “1,” may be used instead of “1,” as necessary.
..., n ". And in the above-mentioned wireless base station group,
Only the main radio base station A has an optical / electrical converter 6 and an electric / electrical converter 6.
An optical converter 14 is provided, and the optical fibers 7 and 1 are connected via the optical / electrical converter 6 and the electrical / optical converter 14.
5 is connected to the toll base station C.
【００１４】次に、上記構成による信号伝送装置の動作
を説明する。初めに、集中基地局Ｃから主無線基地局Ａ
および従無線基地局Ｂ−ｉへ向かう回線（以下、下り回
線と称する）における信号伝送について説明する。ま
ず、集中基地局Ｃ内の変調器９は、内蔵したシンセサイ
ザを用いて、無線区間で割り当てられる周波数帯域幅内
の任意の周波数信号を出力する。そして、周波数変換器
１０は、変調器９の出力信号を、それぞれ周波数変換す
る。また、集中基地局Ｃ内の他の変調器９−Ｂｉおよび
周波数変換器１０−Ｂｉも、並行して同様の処理を行
う。Next, the operation of the signal transmission device having the above configuration will be described. First, toll base station C to main radio base station A
Also, signal transmission in a line (hereinafter referred to as a downlink) going to the slave radio base station B-i will be described. First, the modulator 9 in the centralized base station C uses the built-in synthesizer to output an arbitrary frequency signal within the frequency bandwidth allocated in the wireless section. Then, the frequency converter 10 frequency-converts the output signal of the modulator 9, respectively. Further, the other modulators 9-Bi and the frequency converters 10-Bi in the centralized base station C also perform similar processing in parallel.
【００１５】そして、それぞれの周波数変換器１０，１
０−Ｂｉの出力信号は、合波されて周波数多重信号とな
る。次に、電気／光変換器８は、該周波数多重信号を光
信号に変換し、光ファイバ７を介して、主無線基地局Ａ
に伝送する。主無線基地局Ａにおいて、光／電気変換器
６は、集中基地局Ａから伝送された上記光信号を周波数
多重信号に再変換する。Then, the respective frequency converters 10, 1
The 0-Bi output signals are multiplexed into a frequency-multiplexed signal. Next, the electrical / optical converter 8 converts the frequency-multiplexed signal into an optical signal and, via the optical fiber 7, the main radio base station A.
To be transmitted. In the main radio base station A, the optical / electrical converter 6 reconverts the optical signal transmitted from the toll base station A into a frequency multiplexed signal.
【００１６】図２は、上記光／電気変換器６の出力信号
（周波数多重信号）における周波数配置、および各帯域
通過フィルタ４，４−Ｂｉの通過帯域を示す説明図であ
る。この図において、ＳＡ，Ｓ１，…，Ｓｎは、変調器
９，９−Ｂ１，…，９−Ｂｎの出力信号がそれぞれ周波
数変換器１０，１０−Ｂ１，…，１０−Ｂｎで周波数変
換された信号を示す。また、ＳＡ，Ｓ１，…，Ｓｎは、
それぞれ帯域通過フィルタ４，４−Ｂ１，…，４−Ｂｎ
の通過帯域△ｆA，△ｆB1，…，△ｆBn内の周波数に配
置されている。さらに、△ｆA，△ｆB1，…，△ｆ
Bnは、それぞれ変調器９，９−Ｂ１，…，９−Ｂｎの可
変周波数帯域に対応している。FIG. 2 is an explanatory diagram showing the frequency arrangement in the output signal (frequency multiplexed signal) of the optical / electrical converter 6 and the pass bands of the band pass filters 4, 4-Bi. In this figure, in SA, S1, ..., Sn, the output signals of the modulators 9, 9-B1, ..., 9-Bn are frequency-converted by frequency converters 10, 10-B1 ,. Indicates a signal. Further, SA, S1, ..., Sn are
Band pass filters 4, 4-B1, ..., 4-Bn, respectively
Passband △ f A, △ f B1, ..., they are arranged in the frequency of the △ f Bn. Further, Δf A , Δf B1 , ..., Δf
Bn corresponds to the variable frequency band of the modulators 9, 9-B1, ..., 9-Bn, respectively.
【００１７】図１に示す分配器５は、光／電気変換器６
が出力する周波数多重信号をｎ＋１分配し、それぞれの
信号を、主無線基地局Ａ内の帯域通過フィルタ４および
各従無線基地局Ｂ−ｉ内の帯域通過フィルタ４−Ｂｉに
入力する。帯域通過フィルタ４は、上記周波数多重信号
の中から、所定の通過帯域（△ｆ A）内の信号（図２に
示すＳＡ）のみを通過させ、出力する。次に、周波数変
換器２４は、帯域通過フィルタ４の出力信号（ＳＡ）を
無線周波数帯に周波数変換し、高出力増幅器３は、該周
波数変換器２４の出力信号を増幅する。そして、高出力
増幅器３の出力信号は、送受切替器２を介してアンテナ
１に入力され、移動端末へ送信される。The distributor 5 shown in FIG. 1 comprises an optical / electrical converter 6
The frequency-multiplexed signal output by
The signal is passed through the band pass filter 4 in the main radio base station A and
The band pass filter 4-Bi in each slave radio base station B-i
input. The band pass filter 4 is the frequency multiplexed signal.
Of the specified passband (Δf A) Signal (in Fig. 2)
Only the indicated SA) is passed and output. Next, change the frequency
The converter 24 outputs the output signal (SA) of the bandpass filter 4.
The frequency is converted to a radio frequency band, and the high output amplifier 3
The output signal of the wave number converter 24 is amplified. And high output
The output signal of the amplifier 3 is sent to the antenna via the duplexer 2.
1 is input and transmitted to the mobile terminal.
【００１８】また、各従無線基地局Ｂ−ｉにおいても、
上述した主無線基地局Ａで行われた処理と同様の処理が
並行して行われる。すなわち、主無線基地局Ａ内の分配
器５が出力した周波数多重信号は、帯域通過フィルタ４
−Ｂｉで所定の通過帯域（△ｆBi）内の信号のみが取り
出され、周波数変換器２４−Ｂｉで周波数変換され、高
出力増幅器３−Ｂｉで増幅後、送受切替器２−Ｂｉを介
してアンテナ１−Ｂｉに入力され、移動端末へ送信され
る。このように、本構成では高出力増幅器と送受切替器
との間に結合器が無いため、図５に示した従来構成より
も高出力増幅器の出力を低く設計でき、無線基地局の消
費電力を低減することができる。Further, in each slave radio base station B-i,
The same process as the process performed by the main radio base station A described above is performed in parallel. That is, the frequency-multiplexed signal output from the distributor 5 in the main radio base station A is the bandpass filter 4
Only the signal in the predetermined pass band (Δf Bi ) is taken out by -Bi, frequency-converted by the frequency converter 24-Bi, amplified by the high-power amplifier 3-Bi, and then transmitted through the transmission / reception switch 2-Bi. It is input to the antenna 1-Bi and transmitted to the mobile terminal. As described above, in this configuration, since there is no coupler between the high-power amplifier and the duplexer, the output of the high-power amplifier can be designed lower than that of the conventional configuration shown in FIG. 5, and the power consumption of the radio base station can be reduced. It can be reduced.
【００１９】次に、主無線基地局Ａおよび従無線基地局
Ｂ−ｉから集中基地局Ｃへ向かう回線（以下、上り回線
と称する）における信号伝送について説明する。図１に
示す主無線基地局Ａにおいて、移動端末（図示略）の送
信信号は、アンテナ１で受信され、送受切替器２および
低雑音増幅器１１を介して、周波数変換器２５に入力さ
れる。また、各従無線基地局Ｂ−ｉにおいても、同様
に、他の移動端末の送信信号が、アンテナ１−Ｂｉで受
信され、送受切替器２−Ｂｉおよび低雑音増幅器１１−
Ｂｉを介して、周波数変換器２５−Ｂｉに入力される。
そして、主無線基地局Ａ内の結合器１３は、各周波数変
換器２５，２５−Ｂｉの出力信号を結合した後、電気／
光変換器１４に入力する。Next, signal transmission in a line (hereinafter referred to as an up line) from the main radio base station A and the sub radio base stations B-i to the toll base station C will be described. In the main radio base station A shown in FIG. 1, a transmission signal of a mobile terminal (not shown) is received by the antenna 1 and input to the frequency converter 25 via the duplexer 2 and the low noise amplifier 11. Also in each slave radio base station B-i, similarly, the transmission signal of another mobile terminal is received by the antenna 1-Bi, the transmission / reception switch 2-Bi and the low noise amplifier 11-.
It is input to the frequency converter 25-Bi via Bi.
Then, the combiner 13 in the main radio base station A combines the output signals of the respective frequency converters 25, 25-Bi and then outputs the electric / electrical signals.
Input to the optical converter 14.
【００２０】図６は、上記結合器１３の出力信号（周波
数多重信号）における周波数配置、および周波数変換器
２５，２５−Ｂ１，…，２５−Ｂｎに内蔵されている帯
域通過フィルタの通過帯域を示す説明図である。この図
において、ＲＡ，Ｒ１，…，Ｒｎは周波数変換器２５の
出力信号を、ＲＡ’，Ｒ１’，…，Ｒｎ’は周波数変換
器２５−Ｂ１の出力信号を、ＲＡ”，Ｒ１”，…，Ｒ
ｎ”は周波数変換器２５−Ｂｎの出力信号を示す。ま
た、△ｆA’，△ｆB1’，…，△ｆBn’は周波数変換器
２５，２５−Ｂ１，…，２５−Ｂｎに内蔵されている帯
域通過フィルタの通過帯域である。FIG. 6 shows the frequency arrangement in the output signal (frequency multiplexed signal) of the combiner 13 and the pass band of the band pass filter built in the frequency converters 25, 25-B1, ..., 25-Bn. It is an explanatory view shown. In this figure, RA, R1, ..., Rn are output signals of the frequency converter 25, RA ', R1', ..., Rn 'are output signals of the frequency converter 25-B1, RA ", R1" ,. , R
n ″ represents the output signal of the frequency converter 25-Bn. Further, Δf A ′, Δf B1 ′, ..., Δf Bn ′ are built in the frequency converters 25, 25-B1, ..., 25-Bn. It is the pass band of the band pass filter that is set.
【００２１】図１に示す主無線基地局Ａ内の電気／光変
換器１４は、結合器１３が出力する周波数多重信号を光
信号に変換し、光ファイバ１５を介して、集中基地局Ｃ
に伝送する。集中基地局Ｃにおいて、光／電気変換器１
６は、上記光信号を周波数多重信号に再変換する。そし
て、光／電気変換器１６の出力信号は、周波数変換器１
９，１９−Ｂｉに入力される。周波数変換器１９は、所
定の信号帯域（図３に示す△ｆA’）内の信号群を、復
調器１８の入力信号帯域内の信号群に周波数変換する。
復調器１８は、内蔵のシンセサイザと帯域通過フィルタ
を用いて上記周波数変換された信号群の中から１つの無
線信号を抽出した後、該無線信号を復調する。また、集
中基地局Ｃ内の他の周波数変換器１９−Ｂｉおよび復調
器１８−Ｂｉも同様の処理を並行して行い、所定の信号
帯域（ΔｆBi）内の信号群を周波数変換した後、１つの
無線信号を抽出・復調する。The electric / optical converter 14 in the main radio base station A shown in FIG. 1 converts the frequency-multiplexed signal output from the coupler 13 into an optical signal and, via the optical fiber 15, the centralized base station C.
To be transmitted. In the centralized base station C, the optical / electrical converter 1
6 reconverts the optical signal into a frequency multiplexed signal. The output signal of the optical / electrical converter 16 is the frequency converter 1
It is input to 9,19-Bi. The frequency converter 19 frequency-converts a signal group in a predetermined signal band (Δf A 'shown in FIG. 3) into a signal group in the input signal band of the demodulator 18.
The demodulator 18 extracts one wireless signal from the frequency-converted signal group using a built-in synthesizer and bandpass filter, and then demodulates the wireless signal. In addition, the other frequency converters 19-Bi and demodulators 18-Bi in the centralized base station C also perform the same processing in parallel to perform frequency conversion on the signal group in the predetermined signal band (Δf Bi ), Extract and demodulate one radio signal.
【００２２】次に、請求項１記載の発明と本実施形態と
の対応関係を説明する。 アンテナ……アンテナ１，１−Ｂｉ 光／電気変換器……光／電気変換器６ 分配器……分配器５ 周波数分離器……帯域通過フィルタ４，４−Ｂｉ 送信周波数変換器……周波数変換器２４，２４−Ｂｉ 受信周波数変換器……周波数変換器２５，２５−Ｂｉ 結合器……結合器１３ 電気／光変換器……電気／光変換器１４Next, the correspondence between the invention according to claim 1 and the present embodiment will be described. Antenna …… Antenna 1,1-Bi Optical / electrical converter …… Optical / electrical converter 6 Distributor …… Distributor 5 Frequency separator …… Bandpass filter 4,4-Bi Transmission frequency converter …… Frequency conversion 24, 24-Bi reception frequency converter ...... frequency converter 25, 25-Bi coupler ...... coupler 13 electric / optical converter ...... electric / optical converter 14
【００２３】§３．第２実施形態 次に、この発明の第２実施形態について説明する。図４
は、この発明の第２実施形態による信号伝送装置の構成
を示すブロック図である。この図において、主無線基地
局Ａ，従無線基地局Ｂ−ｉおよび集中基地局Ｃは、それ
ぞれ図１（第１実施形態）に示したものと同じ構成を有
する。但し、第１実施形態では、主無線基地局Ａおよび
従無線基地局Ｂ−ｉが、同一の無線ゾーンに設置されて
いるのに対して、本実施形態では、それぞれの無線基地
局は、それぞれ異なる無線ゾーン（但し、各無線ゾーン
は全て集中基地局Ｃによってカバーされている）に設置
されている。§3. Second Embodiment Next, a second embodiment of the present invention will be described. FIG.
FIG. 9 is a block diagram showing a configuration of a signal transmission device according to a second embodiment of the present invention. In this figure, the master radio base station A, the slave radio base stations B-i, and the toll base station C each have the same configuration as that shown in FIG. 1 (first embodiment). However, in the first embodiment, the main radio base station A and the sub-radio base stations B-i are installed in the same radio zone, whereas in the present embodiment, each radio base station is They are installed in different radio zones (however, each radio zone is covered by the centralized base station C).
【００２４】そして、主無線基地局Ａおよび従無線基地
局Ｂ−ｉのうち、主無線基地局Ａのみが集中基地局Ｃと
光ファイバ７および１５で接続されている。一方、各従
無線基地局Ｂ−ｉは、主無線基地局Ａが具備する分配器
および結合器（図１に示す分配器５および結合器１３）
を接続部として、メタリックケーブルを介して、主無線
基地局Ａと接続されている。したがって、図６に示した
従来形態では、集中基地局Ｃと各無線基地局との間を、
それぞれ個別の光ファイバで接続していたが、図４に示
す本実施形態では、必要な光ファイバ本数は２本だけで
ある。なお、本実施形態による信号伝送装置の動作は、
第１実施形態による信号伝送装置の動作と同じものであ
るので、該動作の説明は省略する。Of the master radio base station A and the slave radio base stations B-i, only the master radio base station A is connected to the centralized base station C by the optical fibers 7 and 15. On the other hand, each sub-radio base station B-i has a distributor and a combiner included in the main radio base station A (the distributor 5 and the combiner 13 shown in FIG. 1).
Is connected to the main radio base station A via a metallic cable. Therefore, in the conventional form shown in FIG. 6, between the toll base station C and each radio base station,
Although the respective optical fibers are connected to each other, only two optical fibers are required in this embodiment shown in FIG. The operation of the signal transmission device according to the present embodiment is
Since the operation is the same as that of the signal transmission device according to the first embodiment, the description of the operation is omitted.
【００２５】以上、この発明の実施形態を図面を参照し
て詳述してきたが、具体的な構成はこの実施形態に限ら
れるものではなく、この発明の要旨を逸脱しない範囲の
設計の変更等があってもこの発明に含まれる。Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to the embodiments, and changes in design and the like may be made without departing from the gist of the present invention. The present invention is included in the present invention.
【００２６】[0026]
【発明の効果】以上説明したように、本発明によれば、
集中基地局と無線基地局とを光ファイバで接続する信号
伝送装置において、主無線基地局と各従無線基地局と
に、それぞれアンテナを設置したので、高出力増幅器と
アンテナとの間に結合器を設ける必要がなくなる。その
結果、従来構成と比較して高出力増幅器の出力レベルを
該結合器の挿入損失分だけ低減することができ、その分
高出力増幅器の消費電力を低減することができる。した
がって、無線基地局の低消費電力化および小型化を図る
ことができる。また、複数の無線ゾーンのそれぞれに無
線基地局を設置する場合、光伝送路は集中基地局と主無
線基地局との間のみ設ければよく、従来構成と比較して
必要とする光伝送路数を大幅に削減できる。As described above, according to the present invention,
In the signal transmission device that connects the centralized base station and the wireless base station with the optical fiber, since the antennas are installed in the main wireless base station and the slave wireless base stations, respectively, a coupler is provided between the high-power amplifier and the antenna. It becomes unnecessary to provide. As a result, the output level of the high output amplifier can be reduced by the insertion loss of the coupler as compared with the conventional configuration, and the power consumption of the high output amplifier can be reduced accordingly. Therefore, it is possible to reduce the power consumption and the size of the wireless base station. In addition, when a wireless base station is installed in each of a plurality of wireless zones, an optical transmission line may be provided only between the centralized base station and the main wireless base station. The number can be significantly reduced.
【図１】この発明の第１実施形態による信号伝送装置の
構成を示すブロック図である。FIG. 1 is a block diagram showing a configuration of a signal transmission device according to a first embodiment of the present invention.
【図２】同実施形態の下り回線における周波数多重信号
の周波数配置および該周波数多重信号の通過帯域を示す
説明図である。FIG. 2 is an explanatory diagram showing a frequency arrangement of frequency-multiplexed signals and a pass band of the frequency-multiplexed signals in the downlink of the same embodiment.
【図３】同実施形態の上り回線における周波数多重信号
の周波数配置および該周波数多重信号の通過帯域を示す
説明図である。FIG. 3 is an explanatory diagram showing a frequency allocation of frequency-multiplexed signals and a pass band of the frequency-multiplexed signals in the uplink of the same embodiment.
【図４】この発明の第２実施形態による信号伝送装置の
構成を示すブロック図である。FIG. 4 is a block diagram showing a configuration of a signal transmission device according to a second embodiment of the present invention.
【図５】従来の信号伝送装置の構成例を示すブロック図
である。FIG. 5 is a block diagram illustrating a configuration example of a conventional signal transmission device.
【図６】従来の信号伝送装置の構成例を示すブロック図
である。FIG. 6 is a block diagram showing a configuration example of a conventional signal transmission device.
Ａ……主無線基地局、 Ｂ−１，Ｂ−ｎ……従無線基地
局、Ｃ……集中基地局、 Ｄ……従来の無線基地局、
１，１−Ｂ１，１−Ｂｎ……アンテナ、２，２−Ｂ１，
２−Ｂｎ……送受切替器、３，３−Ｂ１，３−Ｂｎ……
高出力増幅器（ＨＰＡ）、４，４−Ｂ１，４−Ｂｎ……
帯域通過フィルタ（ＢＰＦ）、５，２３……分配器、
６，１６……光／電気変換器、７，１５……光ファイ
バ、 ８，１４……電気／光変換器、９，９−Ｂ１，９
−Ｂｎ……変調器（ＭＯＤ）、１０，１９，２４，２５
……周波数変換器（ｆ−ｃｏｎｖ）、１１，１１−Ｂ
１，１１−Ｂｎ……低雑音増幅器（ＬＮＡ）、１３，２
２……結合器、１８，１８−Ｂ１，１８−Ｂｎ……復調
器（ＤＥＭ）A ... Master radio base station, B-1, B-n ... Slave radio base station, C ... Centralized base station, D ... Conventional radio base station,
1,1-B1,1-Bn ... antenna, 2,2-B1,
2-Bn ... Transmission / reception switch, 3,3-B1,3-Bn ...
High power amplifier (HPA), 4,4-B1,4-Bn ...
Band pass filter (BPF), 5, 23 ... Distributor,
6, 16 ... Optical / electrical converter, 7, 15 ... Optical fiber, 8, 14 ... Electric / optical converter, 9, 9-B1, 9
-Bn ... Modulator (MOD) 10, 19, 24, 25
... Frequency converter (f-conv), 11, 11-B
1, 11-Bn ... Low noise amplifier (LNA), 13, 2
2 ... Combiner, 18, 18-B1, 18-Bn ... Demodulator (DEM)
Claims (2)
び変復調装置を有する集中基地局と、所定無線ゾーン内
の移動端末に対して無線信号を送受信する無線基地局と
が光ファイバで接続された構成の信号伝送装置におい
て、 前記集中基地局は、前記光ファイバを接続する電気／光
変換器および光／電気変換器を具備し、 前記無線基地局は、主無線基地局と１つまたは複数の従
無線基地局から構成されると共に、 前記主無線基地局は、 前記移動端末に対して無線信号を送受信するアンテナ
と、 前記光ファイバを介して、前記集中基地局が出力する光
信号を受信し、該光信号を周波数多重信号に変換する光
／電気変換器と、 前記主無線基地局の光／電気変換器が出力する周波数多
重信号を分配する分配器と、 前記分配器が出力する周波数多重信号から、所定周波数
の１信号を分離する周波数分離器と、 前記主無線基地局の周波数分離器が分離した信号を、前
記主無線基地局のアンテナの送信信号に変換する送信周
波数変換器と、 前記主無線基地局のアンテナが受信した受信信号の周波
数を変換する受信周波数変換器と、 前記主無線基地局および前記従無線基地局の受信周波数
変換器が出力する信号を周波数多重する結合器と、 前記結合器が出力する周波数多重信号を光信号に変換
し、前記光ファイバを介して、該光信号を前記集中基地
局へ送信する電気／光変換器とを具備し、 前記従無線基地局は、 前記主無線基地局が無線信号を送受信している移動端末
とは異なる移動端末に対して無線信号を送受信するアン
テナと、 前記分配器が出力する周波数多重信号から、前記主無線
基地局の周波数分離器が分離した無線信号とは周波数の
異なる１信号を分離する周波数分離器と、 前記従無線基地局の周波数分離器が分離した信号を、前
記従無線基地局のアンテナの送信信号に変換する送信周
波数変換器と、 前記従無線基地局のアンテナが受信した受信信号の周波
数を変換する受信周波数変換器とを具備し、 前記主無線基地局の分配器と前記従無線基地局の周波数
分離器との間、および、前記従無線基地局の受信周波数
変換器と前記主無線基地局の結合器との間が同軸ケーブ
ルで接続されていることを特徴とする信号伝送装置。1. A configuration in which a centralized base station having a line controller and a modulator / demodulator for a wide area communication line and a radio base station for transmitting and receiving radio signals to and from mobile terminals within a predetermined radio zone are connected by an optical fiber. In the signal transmission device, the toll base station includes an electrical / optical converter and an optical / electrical converter that connect the optical fibers, and the wireless base station includes a master wireless base station and one or more slave wireless stations. While being configured from a base station, the main radio base station receives an optical signal output by the toll base station via an antenna that transmits and receives a radio signal to and from the mobile terminal, and the optical fiber, An optical / electrical converter for converting an optical signal into a frequency-multiplexed signal, a distributor for distributing the frequency-multiplexed signal output by the optical / electrical converter of the main radio base station, and a frequency-multiplexer output by the distributor. From the signal, a frequency separator that separates one signal of a predetermined frequency, and a transmission frequency converter that converts the signal separated by the frequency separator of the main radio base station into a transmission signal of the antenna of the main radio base station, A reception frequency converter that converts the frequency of a reception signal received by the antenna of the main radio base station; and a combiner that frequency multiplexes signals output by the reception frequency converters of the main radio base station and the slave radio base station. An electrical / optical converter that converts the frequency-multiplexed signal output from the coupler into an optical signal and transmits the optical signal to the toll base station via the optical fiber, the slave radio base station Is an antenna that transmits and receives radio signals to and from a mobile terminal different from the mobile terminal that the main radio base station is transmitting and receiving radio signals from; A frequency separator that separates one signal having a different frequency from the radio signal separated by the frequency separator of the ground station, and a signal separated by the frequency separator of the slave radio base station, transmitted by the antenna of the slave radio base station. A transmission frequency converter for converting into a signal, and a reception frequency converter for converting the frequency of the received signal received by the antenna of the sub-radio base station, the distributor of the main radio base station and the sub-radio base station The signal transmission device is characterized in that a coaxial cable is connected between the frequency separator and the receiving frequency converter of the slave radio base station and the coupler of the master radio base station.
る無線ゾーンとは異なる無線ゾーンに設置されているこ
とを特徴とする信号伝送装置。2. The signal transmission device according to claim 1, wherein the slave radio base station is installed in a radio zone different from a radio zone in which the master radio base station is installed. Transmission equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17002395A JP3223952B2 (en) | 1995-07-05 | 1995-07-05 | Signal transmission equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17002395A JP3223952B2 (en) | 1995-07-05 | 1995-07-05 | Signal transmission equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0923209A true JPH0923209A (en) | 1997-01-21 |
| JP3223952B2 JP3223952B2 (en) | 2001-10-29 |
Family
ID=15897173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17002395A Expired - Lifetime JP3223952B2 (en) | 1995-07-05 | 1995-07-05 | Signal transmission equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3223952B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001168802A (en) * | 1999-10-14 | 2001-06-22 | Korea Advanced Inst Of Sci Technol | Subcarrier multiplex system two-way self-curing torus optical communication network |
| US7043271B1 (en) | 1999-09-13 | 2006-05-09 | Kabushiki Kaisha Toshiba | Radio communication system |
-
1995
- 1995-07-05 JP JP17002395A patent/JP3223952B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7043271B1 (en) | 1999-09-13 | 2006-05-09 | Kabushiki Kaisha Toshiba | Radio communication system |
| US7496384B2 (en) | 1999-09-13 | 2009-02-24 | Kabushiki Kaisha Toshiba | Radio communication system |
| JP2001168802A (en) * | 1999-10-14 | 2001-06-22 | Korea Advanced Inst Of Sci Technol | Subcarrier multiplex system two-way self-curing torus optical communication network |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3223952B2 (en) | 2001-10-29 |
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