JPH08340574A - Signal transmission system - Google Patents
Signal transmission systemInfo
- Publication number
- JPH08340574A JPH08340574A JP7147366A JP14736695A JPH08340574A JP H08340574 A JPH08340574 A JP H08340574A JP 7147366 A JP7147366 A JP 7147366A JP 14736695 A JP14736695 A JP 14736695A JP H08340574 A JPH08340574 A JP H08340574A
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- Prior art keywords
- signal
- frequency
- base station
- optical
- radio
- Prior art date
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- Mobile Radio Communication Systems (AREA)
- Optical Communication System (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、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て、これを光ファ
イバで伝送するサブキャリア光伝送方式に関し、特に、
無線基地局が周波数の異なる複数の移動端末からの信号
を受信して、これを集中基地局に光信号として伝送する
系の信号伝送方式に係る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subcarrier optical transmission system for converting a modulated electric signal into an optical signal by an electric / optical converter and transmitting the optical signal through an optical fiber.
The present invention relates to a signal transmission system of a system in which a radio base station receives signals from a plurality of mobile terminals having different frequencies and transmits the signals to a centralized base station as an optical signal.
【０００２】[0002]
【従来の技術】近年、マイクロセル移動無線通信方式に
おいて集中基地局と無線基地局を光ファイバで接続し、
サブキャリア光伝送を適用する方式が検討されている。
この方式では周波数およびレベルの異なる複数の無線信
号が伝送される上りの光伝送路（無線基地局から集中基
地局への信号伝送方向）のダイナミックレンジを拡大す
ることが重要な課題となる。2. Description of the Related Art In recent years, in a microcell mobile radio communication system, a centralized base station and a radio base station are connected by an optical fiber,
A method of applying subcarrier optical transmission is under study.
In this method, it is important to expand the dynamic range of the upstream optical transmission line (the signal transmission direction from the radio base station to the centralized base station) through which a plurality of radio signals having different frequencies and levels are transmitted.
【０００３】このようなダイナミックレンジ拡大技術の
１つとして、本願発明者等は、先に、「平成３年特許願
第１７８２４３号」によってＦＭ２次変調技術を提案し
ている。As one of such dynamic range expansion techniques, the inventors of the present application have previously proposed an FM second-order modulation technique according to "1991 Patent Application No. 178243".
【０００４】図６は、このＦＭ２次変調を適用したマイ
クロセル移動無線通信方式の上り回線の構成の例を示す
図であって、Ａは無線基地局、Ｂは集中基地局、Ｃ−１
〜Ｃ−ｎは移動端末、Ｄは１台の無線基地局がカバーす
るセル、１はアンテナ、２は低雑音増幅器、４は周波数
変調器（ＦＭ変調器、図ではＦＭ ＭＯＤと表示してい
る）を表わしている。FIG. 6 is a diagram showing an example of an uplink configuration of a microcell mobile radio communication system to which this FM secondary modulation is applied, where A is a radio base station, B is a toll base station, and C-1.
Cn is a mobile terminal, D is a cell covered by one radio base station, 1 is an antenna, 2 is a low noise amplifier, 4 is a frequency modulator (FM modulator, and is shown as FM MOD in the figure). ) Is represented.
【０００５】また、５は電気／光変換器（Ｅ／Ｏ）、６
は光ファイバ、７は光／電気変換器（Ｏ／Ｅ）、８はＦ
Ｍ復調器（図ではＦＭ ＤＥＭと記載）、９は分配器
（図では略号にてＨと記載）、１０−１〜１０−ｎは復
調器、１１はインタフェース、１７はミキサ、１８はロ
ーカル発振器を表わしている。Further, 5 is an electric / optical converter (E / O), and 6
Is an optical fiber, 7 is an optical / electrical converter (O / E), and 8 is F
M demodulator (denoted as FM DEM in the figure), 9 is a distributor (denoted as H in the figure), 10-1 to 10-n are demodulators, 11 is an interface, 17 is a mixer, 18 is a local oscillator Is represented.
【０００６】同図において、複数の移動端末Ｃ−１〜Ｃ
−ｎから送信された無線信号は、一括してＦＭ変調器４
でＦＭ信号に変換される。このＦＭ信号はＥ／Ｏ５で光
信号に変換され、光ファイバ６を介して集中基地局Ｂへ
伝送される。In the figure, a plurality of mobile terminals C-1 to C
The radio signals transmitted from the -n are collectively FM modulator 4
Is converted to an FM signal. This FM signal is converted into an optical signal by E / O5 and transmitted to the toll base station B via the optical fiber 6.
【０００７】集中基地局Ｂにおいて受信される光信号は
Ｏ／Ｅ７で無線信号（ＦＭ信号）に再変換された後、Ｆ
Ｍ復調器８に入力される。ＦＭ信号はＦＭ復調器８で無
線信号に再変換された後、１波毎に復調器１０−１〜１
０−ｎに入力される。The optical signal received by the toll base station B is converted back to a radio signal (FM signal) at O / E7, and then F
It is input to the M demodulator 8. The FM signal is reconverted into a radio signal by the FM demodulator 8 and then demodulated 10-1 to 1 for each wave.
Input to 0-n.
【０００８】ＦＭ２次変調ではサブキャリア信号として
ＦＭ信号を用いるので光伝送路で発生する相互変調歪の
影響を無視できる。また、光変調度を高く設定するこ
と、およびＦＭ広帯域利得によりＣＮＲが改善される。Since FM signals are used as subcarrier signals in FM secondary modulation, the effect of intermodulation distortion generated in the optical transmission line can be ignored. Also, the CNR is improved by setting the optical modulation degree high and the FM wide band gain.
【０００９】これらの伝送特性改善要素のうち、ＦＭ広
帯域利得はＦＭ変調指数ｍFMの２乗に比例する。最大周
波数偏移をｄｅｖ、最高変調周波数をｆmax とすると、
ＦＭ変調指数ｍFMは“数１”のように表わせる。Among these transmission characteristic improving factors, the FM wide band gain is proportional to the square of the FM modulation index m FM . If the maximum frequency deviation is dev and the maximum modulation frequency is f max ,
The FM modulation index m FM can be expressed as "Equation 1".
【００１０】[0010]
【数１】 [Equation 1]
【００１１】“数１”において、ｄｅｖはＦＭ変調器に
用いられるＶＣＯの特性によって決まる。従って、ｍFM
を大きく設定するためには、ｆmax を低く設定すれば良
い。このような、ｆmax を低く設定する方法として、ミ
キサ１７において複数の受信信号を一括してダウンコン
バートする構成を先に述べた「平成３年特許願第１７８
２４３号」で示している。In "Equation 1", dev is determined by the characteristics of the VCO used in the FM modulator. Therefore, m FM
In order to set a large value, f max should be set low. As a method of setting f max low as described above, a configuration in which a plurality of received signals are collectively down-converted in the mixer 17 is described above in “1991 Patent Application No. 178”.
No. 243 ”.
【００１２】[0012]
【発明が解決しようとする課題】上述したような、従来
のダイナミックレンジの拡大技術では、受信信号を１台
のローカル発振器で一括してダウンコンバートする場
合、ｆmax は割り当てられたチャネルの周波数帯域によ
って制限される。すなわち、ｆmax を、或る一定値以上
に低くすることはできないという問題があった。In the conventional dynamic range expansion technique as described above, f max is the frequency band of the assigned channel when the received signals are down-converted collectively by one local oscillator. Limited by That is, there is a problem that f max cannot be lowered to a certain value or more.
【００１３】本発明はＦＭ２次変調方式において、ＦＭ
変調器に入力される最高変調周波数を、ＦＭ変調器の前
段で複数の無線信号を一括してダウンコンバートした場
合よりも低くすることが可能で、また、その周波数配置
を工夫することにより伝送特性を、より向上させること
のできる信号伝達方式を提供することを目的としてい
る。According to the present invention, in the FM secondary modulation method, the FM
The maximum modulation frequency input to the modulator can be made lower than that when a plurality of wireless signals are collectively down-converted in the preceding stage of the FM modulator, and the transmission characteristics can be improved by devising the frequency arrangement. It is an object of the present invention to provide a signal transmission method capable of further improving the above.
【００１４】[0014]
【課題を解決するための手段】本発明によれば、上述の
課題は、前記特許請求の範囲に記載した手段により解決
される。According to the invention, the aforesaid problems are solved by the means defined in the claims.
【００１５】すなわち、請求項１の発明は、集中基地局
と複数の移動端末が無線基地局を介して接続され、集中
基地局と無線基地局を光伝送路で接続する通信方式にお
いて、無線基地局に、受信した複数の無線信号の搬送波
周波数を１信号毎に周波数変換する周波数変換回路と、
該搬送波周波数を変換された無線信号を一括して周波数
変調する周波数変調器と、該周波数変調信号を光信号に
変換する電気／光変換器を具備せしめると共に、That is, the invention of claim 1 is a communication system in which a toll base station and a plurality of mobile terminals are connected via a radio base station, and the toll base station and the radio base station are connected by an optical transmission line. A frequency conversion circuit that frequency-converts carrier frequencies of a plurality of received radio signals into the station for each signal;
A frequency modulator for collectively frequency-modulating the carrier frequency-converted radio signals, and an electric / optical converter for converting the frequency-modulated signal into an optical signal are provided.
【００１６】集中基地局に、上記光信号を受信し、該光
信号を前記ＦＭ信号に再変換する光／電気変換器と、該
ＦＭ信号を前記複数の無線信号に再変換するＦＭ復調器
と、該複数の無線信号を１波毎に分波した後復調する複
数の復調器とを具備せしめ、前記無線基地局の周波数変
換回路の出力信号の最高周波数を、入力信号の最高周波
数よりも低くするようにした信号伝送方式である。An optical / electrical converter that receives the optical signal and reconverts the optical signal into the FM signal, and an FM demodulator that reconverts the FM signal into the plurality of radio signals in a centralized base station. A plurality of demodulators for demultiplexing the plurality of radio signals for each wave, and demodulating the plurality of radio signals for each wave, and making the maximum frequency of the output signal of the frequency conversion circuit of the radio base station lower than the maximum frequency of the input signal. This is the signal transmission method.
【００１７】請求項２の発明は、集中基地局と複数の移
動端末がダイバーシチ受信を行なう無線基地局を介して
接続され、集中基地局と無線基地局を光伝送路で接続す
る通信方式において、無線基地局に、受信した複数の無
線信号の搬送波周波数を１信号毎に周波数変換する周波
数変換回路と、According to a second aspect of the present invention, a toll base station is connected to a plurality of mobile terminals via a radio base station for diversity reception, and the toll base station and the radio base station are connected by an optical transmission line. A frequency conversion circuit for converting the carrier frequencies of a plurality of received wireless signals into the wireless base station for each signal;
【００１８】搬送波周波数を変換された無線信号を一括
して周波数変調する周波数変調器とをダイバーシチ枝に
対応せしめて複数系列設け、該複数の周波数変調器の出
力を合成する結合器と該結合器の出力を光信号に変換す
る電気／光変換器を具備せしめると共に、A frequency modulator for collectively frequency-modulating radio signals whose carrier frequencies have been converted is provided in a plurality of series corresponding to diversity branches, and a combiner for combining outputs of the plurality of frequency modulators and the combiner. It is equipped with an electrical / optical converter that converts the output of
【００１９】集中基地局に、上記光信号を受信し、該光
信号をＦＭ信号に再変換する光／電気変換器と、該光／
電気変換器の出力を分波した後、それぞれ前記各周波数
変調器の入力と等価な無線信号に再変換する複数のＦＭ
復調器と、該複数のＦＭ復調器毎の出力の無線信号を１
波毎に分波した後復調する複数の復調器とを具備せし
め、前記無線基地局の周波数変換回路の出力信号の最高
周波数を、入力信号の最高周波数よりも低くするように
した信号伝送方式である。An optical / electrical converter for receiving the optical signal and reconverting the optical signal into an FM signal is provided to the centralized base station, and the optical / electrical converter is provided.
After demultiplexing the output of the electric converter, a plurality of FMs are respectively reconverted into radio signals equivalent to the inputs of the frequency modulators.
A demodulator and a radio signal output from each of the plurality of FM demodulators
A plurality of demodulators for demultiplexing after each wave is provided, and the maximum frequency of the output signal of the frequency conversion circuit of the radio base station is set to be lower than the maximum frequency of the input signal by a signal transmission method. is there.
【００２０】請求項３の発明は、集中基地局と複数の移
動端末がダイバーシチ受信を行なう無線基地局を介して
接続され、集中基地局と無線基地局を光伝送路で接続す
る通信方式において、無線基地局に、受信した複数の無
線信号の搬送波周波数を１信号毎に周波数変換する周波
数変換回路をダイバーシチ枝に対応せしめて複数系列設
け、According to a third aspect of the present invention, in a communication system in which a toll base station and a plurality of mobile terminals are connected via a radio base station for diversity reception, and the toll base station and the radio base station are connected by an optical transmission line, In the wireless base station, a plurality of series of frequency conversion circuits that convert the carrier frequencies of a plurality of received wireless signals for each signal are provided in association with the diversity branch.
【００２１】該複数の周波数変換回路の出力を合成する
結合器と、該結合器の出力の搬送波周波数を変換された
無線信号を一括して周波数変調する周波数変調器と、該
周波数変調信号を光信号に変換する電気／光変換器を具
備せしめると共に、A combiner for synthesizing the outputs of the plurality of frequency conversion circuits, a frequency modulator for collectively frequency-modulating the radio signals whose carrier frequencies of the outputs of the combiner are converted, and the frequency-modulated signal are optically generated. In addition to being equipped with an electrical / optical converter for converting into a signal,
【００２２】集中基地局に、上記光信号を受信し、該光
信号を前記ＦＭ信号に再変換する光／電気変換器と、該
ＦＭ信号を前記複数の無線信号に再変換するＦＭ復調器
と、該複数の無線信号を１波毎に分波した後復調する複
数の復調器とを具備せしめ、前記無線基地局の周波数変
換回路の出力信号の最高周波数を、入力信号の最高周波
数よりも低くするようにした信号伝送方式である。An optical / electrical converter that receives the optical signal and reconverts the optical signal into the FM signal, and an FM demodulator that reconverts the FM signal into the plurality of radio signals in a centralized base station. A plurality of demodulators for demultiplexing the plurality of radio signals for each wave, and demodulating the plurality of radio signals for each wave, and making the maximum frequency of the output signal of the frequency conversion circuit of the radio base station lower than the maximum frequency of the input signal. This is the signal transmission method.
【００２３】請求項４の発明は、上記請求項１〜請求項
３の発明の無線基地局の無線信号の搬送波周波数を変換
する回路において、周波数変換後の各周波数がＦＭ変調
器の入力側で互いに相互変調歪あるいは高調波歪を受け
ない周波数配置となるように構成したものである。According to a fourth aspect of the present invention, in the circuit for converting the carrier frequency of the radio signal of the radio base station according to the first to third aspects of the invention, each frequency after frequency conversion is on the input side of the FM modulator. The frequency arrangement is such that mutual modulation distortion or harmonic distortion does not occur.
【００２４】[0024]
【作用】本発明は、ＦＭ２次変調を適用した無線基地局
において、複数の移動端末からの受信信号を１波毎に抽
出し、それぞれの受信信号の周波数間隔を縮小した周波
数配置に周波数変換してＦＭ変調器に入力される最高変
調周波数を低くすることを特徴とする。According to the present invention, in a radio base station to which FM secondary modulation is applied, received signals from a plurality of mobile terminals are extracted for each wave, and frequency conversion is performed to a frequency arrangement in which the frequency interval of each received signal is reduced. The maximum modulation frequency input to the FM modulator is reduced.
【００２５】本発明によれば、ＦＭ変調器に入力される
最高変調周波数が低くなるように周波数変換した後、Ｆ
Ｍ変調するので、ＦＭ変調指数が高くなりＦＭ広帯域利
得が大きくなるから、ＣＮＲが改善される。従って、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よ
うになる。また、互いに相互変調歪あるいは高調波歪を
受けない周波数配置とすることによって、ＦＭ変調器の
歪特性による影響を緩和することができる。According to the present invention, after performing frequency conversion so that the maximum modulation frequency input to the FM modulator becomes low, F
Since the M modulation is performed, the FM modulation index is increased and the FM wide band gain is increased, so that the CNR is improved. Therefore, the dynamic range of the uplink can be expanded. In addition, the influence of the distortion characteristics of the FM modulator can be mitigated by arranging the frequencies so that they do not receive mutual modulation distortion or harmonic distortion.
【００２６】[0026]
【実施例】図１は本発明の第１の実施例を示す図であっ
て、Ａは無線基地局、Ｂは集中基地局、Ｃ−１〜Ｃ−ｎ
は移動端末、Ｄは１台の無線基地局がカバーするセル、
１はアンテナ、２は低雑音増幅器、３は周波数変換回路
（図ではｆ−ｃｏｎｖと記載）を表わしている。FIG. 1 is a diagram showing a first embodiment of the present invention, in which A is a radio base station, B is a toll base station, and C-1 to C-n.
Is a mobile terminal, D is a cell covered by one radio base station,
Reference numeral 1 is an antenna, 2 is a low noise amplifier, and 3 is a frequency conversion circuit (shown as f-conv in the figure).
【００２７】また、４は周波数変調器（ＦＭ変調器、図
ではＦＭ ＭＯＤと記載）、５は電気／光変換器（Ｅ／
Ｏ）、６は光ファイバ、７は光／電気変換器（Ｏ／
Ｅ）、８はＦＭ復調器（図ではＦＭ ＤＥＭと記載）、
９は分配器（図では略号にてＨと記載）、１０−１〜１
０−ｎは復調器、１１はインタフェースを表わしてい
る。Further, 4 is a frequency modulator (FM modulator, described as FM MOD in the figure), and 5 is an electric / optical converter (E / E).
O), 6 is an optical fiber, 7 is an optical / electrical converter (O /
E) and 8 are FM demodulators (described as FM DEM in the figure),
9 is a distributor (indicated as H in the drawing), 10-1 to 1
Reference numeral 0-n represents a demodulator, and 11 represents an interface.
【００２８】同図において、移動端末Ｃ−１〜Ｃ−ｎと
無線基地局Ａの間は無線伝送、無線基地局Ａと集中基地
局Ｂの間は光ファイバ伝送を行なう。無線基地局Ａで
は、複数の移動端末Ｃ−１〜Ｃ−ｎからの送信信号をア
ンテナ１により受信する。周波数多重された受信信号は
低雑音増幅器２で増幅された後、周波数変換回路３に入
力される。In the figure, radio transmission is performed between the mobile terminals C-1 to C-n and the radio base station A, and optical fiber transmission is performed between the radio base station A and the centralized base station B. In the radio base station A, the antenna 1 receives the transmission signals from the plurality of mobile terminals C-1 to C-n. The frequency-multiplexed received signal is amplified by the low noise amplifier 2 and then input to the frequency conversion circuit 3.
【００２９】周波数変換回路では、各移動端末毎の受信
信号に分波して、それぞれ周波数変換した後、これらを
一括して無線信号として出力する。（周波数変換回路の
構成等については後述する）そして、この無線信号は、
一括してＦＭ変調器４でＦＭ信号に変換される。The frequency conversion circuit demultiplexes the received signal of each mobile terminal, frequency-converts each, and outputs them collectively as a radio signal. (The configuration of the frequency conversion circuit will be described later.) Then, this wireless signal
The signals are collectively converted into FM signals by the FM modulator 4.
【００３０】このＦＭ信号はＥ／Ｏ５で光信号に変換さ
れ、光ファイバ６を介して集中基地局Ｂへ伝送される。
集中基地局Ｂにおいて受信された光信号は、Ｏ／Ｅ７で
無線信号（ＦＭ信号）に再変換された後、ＦＭ復調器８
に入力される。ＦＭ信号はＦＭ復調器８で無線信号に再
変換された後、１波毎に復調器１０−１〜１０−ｎに入
力される。This FM signal is converted into an optical signal by E / O5 and transmitted to the centralized base station B via the optical fiber 6.
The optical signal received by the centralized base station B is converted back to a wireless signal (FM signal) by the O / E 7, and then the FM demodulator 8
Is input to The FM signal is reconverted into a radio signal by the FM demodulator 8 and then input to the demodulators 10-1 to 10-n for each wave.
【００３１】図２は図１で示した周波数変換回路３の構
成を示す図で、１２は分配器（図では略号にてＨと記
載）、１３−１〜１３−ｎはミキサ、１４−１〜１４−
ｎはシンセサイザ、１５−１〜１５−ｎは周波数分離
器、１６は結合器（図では略号にてＣと記載）を表わし
ている。FIG. 2 is a diagram showing the configuration of the frequency conversion circuit 3 shown in FIG. 1, in which 12 is a distributor (indicated by H in the drawing), 13-1 to 13-n are mixers, and 14-1. ~ 14-
n is a synthesizer, 15-1 to 15-n are frequency separators, and 16 is a combiner (indicated by C in the drawing).
【００３２】同図において、ミキサ１３−１〜１３−ｎ
には、周波数多重された複数の無線信号、および、それ
ぞれのミキサに接続するシンセサイザ１４−１〜１４−
ｎからのローカル信号が入力される。シンセサイザ１４
−１〜１４−ｎの発振周波数は、ミキサ１３−１〜１３
−ｎから出力される複数の無線信号のうちの、相異なる
１変調波の周波数が、周波数分離器１５−１〜１５−ｎ
の中心周波数とそれぞれ一致するよう制御される。In the figure, the mixers 13-1 to 13-n are shown.
Includes a plurality of frequency-multiplexed radio signals, and synthesizers 14-1 to 14- connected to respective mixers.
The local signal from n is input. Synthesizer 14
The oscillation frequencies of -1 to 14-n are the mixers 13-1 to 13-13.
Of the plurality of radio signals output from -n, different frequencies of one modulated wave are frequency separators 15-1 to 15-n.
It is controlled so as to match the center frequency of each.
【００３３】ＢＰＦ１５−１〜１５−ｎの通過信号帯域
幅は１変調波の信号帯域幅に設定されており、ＢＰＦ１
５−１〜１５−ｎの通過帯域中心周波数は各出力信号の
周波数間隔が周波数変換回路３の各入力信号の周波数間
隔よりも狭く設定されるため、最高変調周波数は従来の
受信信号を一括してダウンコンバートした場合よりも低
くなる。The pass signal bandwidths of the BPFs 15-1 to 15-n are set to the signal bandwidth of one modulated wave, and the BPF1
As for the pass band center frequencies of 5-1 to 15-n, the frequency interval of each output signal is set narrower than the frequency interval of each input signal of the frequency conversion circuit 3, so that the highest modulation frequency is the same as that of the conventional received signal. Will be lower than when down-converted.
【００３４】従って、従来の技術と比べてＦＭ変調指数
が大きくなりＦＭ広帯域利得が大きくなるので、ＣＮＲ
の改善効果が大きくなる。図２において、各移動端末に
割り当てられる無線周波数がそれぞれ固定されている場
合、シンセサイザ１４−１〜１４−ｎはローカル発振器
に置き換えることができる。Therefore, since the FM modulation index becomes larger and the FM wide band gain becomes larger than that of the conventional technique, the CNR is obtained.
The improvement effect of is increased. In FIG. 2, when the radio frequency assigned to each mobile terminal is fixed, the synthesizers 14-1 to 14-n can be replaced with local oscillators.
【００３５】図３は、周波数変換後の各周波数が相互変
調歪を受けないようにする場合の、ＦＭ変調器入力信号
の周波数配置の例を示す図である。この場合、各信号Ｓ
１，Ｓ２，Ｓ３，…，Ｓｉ，…，Ｓｎに、３次相互変調
歪Ｄ１，Ｄ２および高調波歪Ｄｉが発生する周波数以外
の周波数を割り当てることによって、ＦＭ変調器の非線
形性で発生する３次相互変調歪あるいは高調波歪による
信号の劣化を回避することができる。FIG. 3 is a diagram showing an example of the frequency arrangement of the FM modulator input signal in the case where each frequency after frequency conversion is prevented from being subjected to intermodulation distortion. In this case, each signal S
, S2, S3, ..., Si, ..., Sn are assigned to frequencies other than the frequencies at which the third-order intermodulation distortions D1 and D2 and the harmonic distortion Di are generated, so that the nonlinearity of the FM modulator is generated. It is possible to avoid signal deterioration due to second-order intermodulation distortion or harmonic distortion.
【００３６】図４は本発明の第２の実施例を示す図であ
って、２系統のダイバーシチ受信を行なう場合の構成の
例を示している。同図において、符号Ａ，Ｂ，Ｃ−１，
Ｃ−２，Ｄ，１〜１０−１，１０−ｎについては、図１
と同様であり、１９は結合器、２０は分配器を表わして
いる。また、ダイバーシチ枝に対応する一方の構成部に
ついては同一数字符号にダッシュを付して示している。FIG. 4 is a diagram showing a second embodiment of the present invention and shows an example of the configuration in the case of performing diversity reception of two systems. In the figure, reference characters A, B, C-1,
Regarding C-2, D, 1 to 10-1, and 10-n, FIG.
19 is a coupler and 20 is a distributor. In addition, for one of the components corresponding to the diversity branch, the same numeral symbol is shown with a dash.
【００３７】同図において、移動端末Ｃ−１〜Ｃ−ｎと
無線基地局Ａの間は無線伝送によって、また、無線基地
局Ａと集中基地局Ｂの間は光ファイバ伝送を行なうこと
は図１の場合と同様である。無線基地局Ａでは、複数の
移動端末Ｃ−１〜Ｃ−ｎからの送信信号をアンテナ１お
よび１´により受信する。周波数多重された受信信号
は、低雑音増幅器２，２´で増幅された後、周波数変換
回路３，３´に入力される。In the figure, wireless transmission is performed between the mobile terminals C-1 to C-n and the wireless base station A, and optical fiber transmission is performed between the wireless base station A and the toll base station B. It is similar to the case of 1. In the radio base station A, the transmission signals from the plurality of mobile terminals C-1 to C-n are received by the antennas 1 and 1 '. The frequency-multiplexed received signal is amplified by the low noise amplifiers 2 and 2 ', and then input to the frequency conversion circuits 3 and 3'.
【００３８】各周波数変換回路３，３´では、各移動端
末毎の受信信号に分波して、それぞれ周波数変換した
後、各周波数変換回路の出力毎にこれらを一括して無線
信号として出力する。（各周波数変換回路の構成等につ
いては図１で示したものと同様である。）そして、これ
らの無線信号は、それぞれ一括してＦＭ変調器４，４´
で搬送周波数の相異なるＦＭ信号に変換され、結合器１
９で結合される。In each of the frequency conversion circuits 3 and 3 ', the received signal of each mobile terminal is demultiplexed, the respective frequencies are converted, and then these are collectively output as a radio signal for each output of each frequency conversion circuit. . (The configuration of each frequency conversion circuit is similar to that shown in FIG. 1.) Then, these radio signals are collectively FM modulators 4 and 4 '.
Are converted into FM signals with different carrier frequencies by the coupler 1
Combined at 9.
【００３９】結合器１９から出力される搬送周波数の相
異なる２波のＦＭ信号は、Ｅ／Ｏ５で光信号に変換さ
れ、光ファイバ６を介して集中基地局Ｂへ伝送される。
集中基地局Ｂにおいて受信された光信号は、Ｏ／Ｅ７で
無線信号（ＦＭ信号）に再変換された後、分配器２０に
よって、各ダイバーシチ枝毎に分配されて各ＦＭ復調器
８，８´に入力される。The two-wave FM signals having different carrier frequencies output from the coupler 19 are converted into optical signals by the E / O5 and transmitted to the centralized base station B via the optical fiber 6.
The optical signal received by the centralized base station B is converted back to a radio signal (FM signal) by the O / E 7, and then distributed by the distributor 20 for each diversity branch, and each FM demodulator 8, 8 ′. Entered in.
【００４０】搬送周波数の相異なる２波のＦＭ信号は、
各ＦＭ信号に対応するＦＭ復調器８，８´でそれぞれ無
線信号に再変換された後、各ＦＭ復調器の出力は、それ
ぞれ分配されて１波毎に復調器１０−１〜１０−ｎおよ
び１０−１´〜１０−ｎ´に入力される。各復調器１０
−１〜１０−ｎと１０−１´〜１０−ｎ´の出力は、対
応するもの同士合成されるか、あるいは、品質の良い方
の信号が選択されて使用される。Two-wave FM signals having different carrier frequencies are
After the FM demodulators 8 and 8'corresponding to the FM signals are respectively reconverted into radio signals, the outputs of the FM demodulators are respectively distributed and demodulated for each wave into demodulators 10-1 to 10-n and. It is input to 10-1 'to 10-n'. Each demodulator 10
For the outputs of -1 to 10-n and 10-1 'to 10-n', corresponding signals are combined with each other, or a signal of higher quality is selected and used.
【００４１】本実施例に、先に図３を用いて説明した周
波数変換後の各周波数が相互変調歪を受けないような周
波数配置を適用する場合は、ＦＭ変調器４、および、Ｆ
Ｍ変調器４´のそれぞれの入力側で、各信号Ｓ１，Ｓ
２，Ｓ３，…，Ｓｉ，…，Ｓｎに、３次相互変調歪Ｄ
１，Ｄ２および高調波歪Ｄｉが発生する周波数以外の周
波数を割り当てるようにすれば良い。When the frequency arrangement described above with reference to FIG. 3 is applied to this embodiment so that the frequencies after frequency conversion are not subjected to intermodulation distortion, the FM modulator 4 and F
At each input side of the M modulator 4 ', each signal S1, S
, S3, ..., Si, ..., Sn to the third-order intermodulation distortion D
It suffices to allocate frequencies other than the frequencies at which 1, D2 and harmonic distortion Di occur.
【００４２】図５は本発明の第３の実施例を示す図であ
って、２系統のダイバーシチ受信を行なう場合の図４と
は異なる構成を示している。同図において、符号Ａ，
Ｂ，Ｃ−１，Ｃ−２，Ｄ，１〜１０−１，１０−ｎにつ
いては、図１と同様であり、２１は結合器を表わしてい
る。また、ダイバーシチ枝の一方の構成部については同
一数字符号にダッシュを付して示している。FIG. 5 is a diagram showing a third embodiment of the present invention and shows a configuration different from FIG. 4 in the case of performing diversity reception of two systems. In the figure, reference characters A,
About B, C-1, C-2, D, 1-10-1, 10-n, it is the same as that of FIG. 1, and 21 represents the coupler. In addition, for one component of the diversity branch, the same numeral reference is shown with a dash.
【００４３】同図において、移動端末Ｃ−１〜Ｃ−ｎと
無線基地局Ａの間は無線伝送によって、また、無線基地
局Ａと集中基地局Ｂの間は光ファイバ伝送を行なうこと
は図１の場合と同様である。無線基地局Ａでは、複数の
移動端末Ｃ−１〜Ｃ−ｎからの送信信号を、アンテナ１
および１´により受信する。周波数多重された受信信号
は低雑音増幅器２，２´で増幅された後、周波数変換回
路３，３´に入力される。In the figure, wireless transmission is performed between the mobile terminals C-1 to C-n and the wireless base station A, and optical fiber transmission is performed between the wireless base station A and the toll base station B. It is similar to the case of 1. The radio base station A transmits the transmission signals from the plurality of mobile terminals C-1 to C-n to the antenna 1
And 1 '. The frequency-multiplexed received signal is amplified by the low noise amplifiers 2 and 2 ', and then input to the frequency conversion circuits 3 and 3'.
【００４４】各周波数変換回路３，３´では、各移動端
末毎の受信信号に分波して、それぞれ周波数変換した
後、各周波数変換回路の出力毎にこれらを結合器２１で
結合して無線信号として出力する。（各周波数変換回路
の構成等については図１で示したものと同様である。）In each of the frequency conversion circuits 3 and 3 ′, the received signal of each mobile terminal is demultiplexed and frequency-converted. After that, these are combined by the combiner 21 for each output of each frequency conversion circuit, and the radio signals are transmitted. Output as a signal. (The configuration of each frequency conversion circuit is the same as that shown in FIG. 1.)
【００４５】そして、この無線信号は、一括してＦＭ変
調器４でＦＭ信号に変換された後、Ｅ／Ｏ５で光信号に
変換され、光ファイバ６を介して、集中基地局Ｂへ伝送
される。集中基地局Ｂにおいて受信された光信号は、Ｏ
／Ｅ７で無線信号（ＦＭ信号）に再変換された後、各Ｆ
Ｍ復調器８に入力される。This radio signal is collectively converted into an FM signal by the FM modulator 4, converted into an optical signal by the E / O 5 and transmitted to the centralized base station B via the optical fiber 6. It The optical signal received at the toll base station B is O
After re-converting to a wireless signal (FM signal) at / E7, each F
It is input to the M demodulator 8.
【００４６】ＦＭ信号はＦＭ復調器８無線信号に再変換
された後、１波毎に復調器１０−１〜１０−ｎおよび１
０−１´〜１０−ｎ´に入力される。各復調器１０−１
〜１０−ｎと１０−１´〜１０−ｎ´の出力は、対応す
るもの同士合成されるか、あるいは、品質の良い方の信
号が選択されて使用される。The FM signal is reconverted to the FM demodulator 8 radio signal, and then demodulators 10-1 to 10-n and 1 for each wave.
It is input to 0-1 'to 10-n'. Each demodulator 10-1
For the outputs of 10 to 10-n and 10-1 'to 10-n', corresponding signals are combined with each other, or a signal of higher quality is selected and used.
【００４７】本実施例に、先に図３を用いて説明した周
波数変換後の各周波数が相互変調歪を受けないような周
波数配置を適用する場合は、このＦＭ変調器４の入力側
で、各信号Ｓ１，Ｓ２，Ｓ３，…，Ｓｉ，…，Ｓｎに、
３次相互変調歪Ｄ１，Ｄ２および高調波歪Ｄｉが発生す
る周波数以外の周波数を割り当てるようにする。When the frequency arrangement described above with reference to FIG. 3 is applied to this embodiment so that each frequency after frequency conversion is not subjected to intermodulation distortion, the input side of the FM modulator 4 is For each of the signals S1, S2, S3, ..., Si, ..., Sn,
Frequencies other than the frequencies at which the third-order intermodulation distortions D1 and D2 and the harmonic distortion Di are generated are assigned.
【００４８】[0048]
【発明の効果】以上説明したように、本発明は集中基地
局と無線基地局を光伝送路で接続する信号伝送方式にお
いて、ＦＭ２次変調方式を適用する時、ＦＭ変調器に入
力される最高変調周波数を低くし、ＦＭ変調指数を高く
することができるので、ＦＭ広帯域利得が大きくなる。As described above, according to the present invention, in the signal transmission system in which the centralized base station and the radio base station are connected by the optical transmission line, the maximum input to the FM modulator when the FM secondary modulation system is applied. Since the modulation frequency can be lowered and the FM modulation index can be increased, the FM wide band gain is increased.
【００４９】また、互いに相互変調歪あるいは高調波歪
を受けない周波数配置にしてＦＭ変調器に入力すること
でＦＭ変調器の歪特性による影響を緩和することができ
る。その結果、ＦＭ２次変調方式によるＣＮＲの改善効
果がより大きくなり、ＩＭ３も低減するので上り回線の
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利点がある。Further, the influence due to the distortion characteristic of the FM modulator can be mitigated by arranging the frequency arrangement so as not to receive mutual modulation distortion or harmonic distortion and inputting them to the FM modulator. As a result, the effect of improving the CNR by the FM secondary modulation method is further increased, and IM3 is also reduced, so that it is possible to improve the dynamic range of the uplink and there is an advantage that higher communication quality can be realized.
【図１】本発明の第１の実施例を示す図である。FIG. 1 is a diagram showing a first embodiment of the present invention.
【図２】周波数変換回路の構成の例を示す図である。FIG. 2 is a diagram showing an example of a configuration of a frequency conversion circuit.
【図３】ＦＭ変調器入力信号の周波数配置を説明する図
である。FIG. 3 is a diagram for explaining a frequency arrangement of FM modulator input signals.
【図４】本発明の第２の実施例を示す図である。FIG. 4 is a diagram showing a second embodiment of the present invention.
【図５】本発明の第３の実施例を示す図である。FIG. 5 is a diagram showing a third embodiment of the present invention.
【図６】従来の移動無線通信方式の上り回線の構成の例
を示す図である。FIG. 6 is a diagram showing an example of a configuration of an uplink of a conventional mobile radio communication system.
Ａ 無線基地局 Ｂ 集中基地局 Ｃ−１〜Ｃ−ｎ 移動端末 Ｄ １台の無線基地局のカバーするセル １，１´ アンテナ ２，２´ 低雑音増幅器 ３，３´ 周波数変換回路 ４ ＦＭ変調器 ５ 電気／光変換器 ６ 光ファイバ ７ 光／電気変換器 ８ ＦＭ復調器 ９，１２，２０ 分配器 １０−１〜１０−ｎ，１０−１´〜１０−ｎ´ 復調
器 １１ インタフェース １３−１〜１３−ｎ，１７ ミキサ １４−１〜１４−ｎ シンセサイザ １５−１〜１５−ｎ 周波数分離器 １６，１９，２１ 結合器 １８ ローカル発振器A wireless base station B centralized base station C-1 to C-n mobile terminal D cell covered by one wireless base station 1,1 'antenna 2,2' low noise amplifier 3,3 'frequency conversion circuit 4 FM modulation Device 5 Electric / optical converter 6 Optical fiber 7 Optical / electrical converter 8 FM demodulator 9, 12, 20 Distributor 10-1 to 10-n, 10-1 'to 10-n' Demodulator 11 Interface 13- 1-13-n, 17 mixer 14-1-14-n synthesizer 15-1-15-n frequency separator 16,19,21 coupler 18 local oscillator
Claims (4)
局を介して接続され、集中基地局と無線基地局を光伝送
路で接続する通信方式において、 無線基地局に、受信した複数の無線信号の搬送波周波数
を１信号毎に周波数変換する周波数変換回路と、該搬送
波周波数を変換された無線信号を一括して周波数変調す
る周波数変調器と、該周波数変調信号を光信号に変換す
る電気／光変換器を具備せしめると共に、 集中基地局に、上記光信号を受信し、該光信号を前記Ｆ
Ｍ信号に再変換する光／電気変換器と、該ＦＭ信号を前
記複数の無線信号に再変換するＦＭ復調器と、該複数の
無線信号を１波毎に分波した後復調する複数の復調器と
を具備せしめ、 前記無線基地局の周波数変換回路の出力信号の最高周波
数を、入力信号の最高周波数よりも低くすることを特徴
とする信号伝送方式。1. In a communication system in which a toll base station and a plurality of mobile terminals are connected via a radio base station, and the toll base station and the radio base station are connected by an optical transmission line, the radio base station receives a plurality of received signals. A frequency conversion circuit for frequency-converting the carrier frequency of a radio signal for each signal, a frequency modulator for collectively frequency-modulating the carrier-frequency-converted radio signals, and an electric device for converting the frequency-modulated signal into an optical signal. / Equipped with an optical converter, the centralized base station receives the optical signal, the optical signal to the F
Optical / electrical converter for re-converting to M signal, FM demodulator for re-converting the FM signal to the plurality of radio signals, and a plurality of demodulations for demultiplexing the plurality of radio signals A signal transmission system, wherein the maximum frequency of the output signal of the frequency conversion circuit of the wireless base station is lower than the maximum frequency of the input signal.
シチ受信を行なう無線基地局を介して接続され、集中基
地局と無線基地局を光伝送路で接続する通信方式におい
て、 無線基地局に、受信した複数の無線信号の搬送波周波数
を１信号毎に周波数変換する周波数変換回路と、搬送波
周波数を変換された無線信号を一括して周波数変調する
周波数変調器とをダイバーシチ枝に対応せしめて複数系
列設け、該複数の周波数変調器の出力を合成する結合器
と該結合器の出力を光信号に変換する電気／光変換器を
具備せしめると共に、 集中基地局に、上記光信号を受信し、該光信号をＦＭ信
号に再変換する光／電気変換器と、該光／電気変換器の
出力を分波した後、それぞれ前記各周波数変調器の入力
と等価な無線信号に再変換する複数のＦＭ復調器と、該
複数のＦＭ復調器毎の出力の無線信号を１波毎に分波し
た後復調する複数の復調器とを具備せしめ、 前記無線基地局の周波数変換回路の出力信号の最高周波
数を、入力信号の最高周波数よりも低くすることを特徴
とする信号伝送方式。2. A communication system in which a toll base station and a plurality of mobile terminals are connected via a radio base station that performs diversity reception, and the toll base station and the radio base station are connected by an optical transmission line, in the radio base station, A frequency conversion circuit for frequency-converting the carrier frequencies of a plurality of received radio signals for each signal and a frequency modulator for collectively frequency-modulating the carrier-frequency-converted radio signals are associated with diversity branches to form a plurality of series. And a coupler for synthesizing the outputs of the plurality of frequency modulators and an electric / optical converter for converting the outputs of the couplers into optical signals, and a centralized base station for receiving the optical signals, An optical / electrical converter that reconverts an optical signal into an FM signal, and a plurality of FMs that demultiplexes the output of the optical / electrical converter and then reconverts into a radio signal equivalent to the input of each of the frequency modulators. demodulation And a plurality of demodulators for demultiplexing the radio signals output from each of the plurality of FM demodulators for each wave and demodulating the radio signals. The maximum frequency of the output signal of the frequency conversion circuit of the radio base station is A signal transmission method characterized by lowering the maximum frequency of the input signal.
シチ受信を行なう無線基地局を介して接続され、集中基
地局と無線基地局を光伝送路で接続する通信方式におい
て、 無線基地局に、受信した複数の無線信号の搬送波周波数
を１信号毎に周波数変換する周波数変換回路をダイバー
シチ枝に対応せしめて複数系列設け、該複数の周波数変
換回路の出力を合成する結合器と、該結合器の出力の搬
送波周波数を変換された無線信号を一括して周波数変調
する周波数変調器と、該周波数変調信号を光信号に変換
する電気／光変換器を具備せしめると共に、 集中基地局に、上記光信号を受信し、該光信号を前記Ｆ
Ｍ信号に再変換する光／電気変換器と、該ＦＭ信号を前
記複数の無線信号に再変換するＦＭ復調器と、該複数の
無線信号を１波毎に分波した後復調する複数の復調器と
を具備せしめ、 前記無線基地局の周波数変換回路の出力信号の最高周波
数を、入力信号の最高周波数よりも低くすることを特徴
とする信号伝送方式。3. A communication system in which a toll base station and a plurality of mobile terminals are connected via a radio base station for diversity reception, and the toll base station and the radio base station are connected by an optical transmission line, the radio base station is provided with: A frequency converter circuit for converting the carrier frequency of a plurality of received radio signals for each signal is provided in a plurality of series corresponding to the diversity branch, and a combiner for combining the outputs of the plurality of frequency converter circuits, and a combiner of the combiner The centralized base station is equipped with a frequency modulator that collectively frequency-modulates the radio signals whose output carrier frequencies have been converted, and an electric / optical converter that converts the frequency-modulated signal into an optical signal. And receives the optical signal from the F
Optical / electrical converter for re-converting to M signal, FM demodulator for re-converting the FM signal to the plurality of radio signals, and a plurality of demodulations for demultiplexing the plurality of radio signals A signal transmission system, wherein the maximum frequency of the output signal of the frequency conversion circuit of the wireless base station is lower than the maximum frequency of the input signal.
変換する回路において、周波数変換後の各周波数がＦＭ
変調器の入力側で互いに相互変調歪あるいは高調波歪を
受けない周波数配置とする請求項１〜請求項３のいずれ
か１項に記載の信号伝送方式。4. A circuit for converting a carrier frequency of a radio signal of a radio base station, wherein each frequency after frequency conversion is FM.
The signal transmission system according to any one of claims 1 to 3, wherein the frequency arrangement is such that intermodulation distortion or harmonic distortion is not received on the input side of the modulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14736695A JP3264415B2 (en) | 1995-06-14 | 1995-06-14 | Signal transmission method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14736695A JP3264415B2 (en) | 1995-06-14 | 1995-06-14 | Signal transmission method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08340574A true JPH08340574A (en) | 1996-12-24 |
| JP3264415B2 JP3264415B2 (en) | 2002-03-11 |
Family
ID=15428599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14736695A Expired - Lifetime JP3264415B2 (en) | 1995-06-14 | 1995-06-14 | Signal transmission method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3264415B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008060851A (en) * | 2006-08-30 | 2008-03-13 | Nippon Telegr & Teleph Corp <Ntt> | Radio communication system, radio communication method, radio base station and radio receiving station |
| WO2010076377A1 (en) * | 2008-12-31 | 2010-07-08 | Elektrobit System Test Oy | Communication between transmitter and receiver |
-
1995
- 1995-06-14 JP JP14736695A patent/JP3264415B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008060851A (en) * | 2006-08-30 | 2008-03-13 | Nippon Telegr & Teleph Corp <Ntt> | Radio communication system, radio communication method, radio base station and radio receiving station |
| WO2010076377A1 (en) * | 2008-12-31 | 2010-07-08 | Elektrobit System Test Oy | Communication between transmitter and receiver |
| US8285227B2 (en) | 2008-12-31 | 2012-10-09 | Elektrobit System Test Oy | Communication between transmitter and receiver |
| KR101257600B1 (en) * | 2008-12-31 | 2013-04-26 | 엘렉트로비트 시스템 테스트 오와이 | Communication between transmitter and receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3264415B2 (en) | 2002-03-11 |
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