CN1087896C - 移动通信系统的基站的射频控制电路 - Google Patents
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Abstract
一种移动通信系统的基站的射频控制电路有如下构造：分出向盲区发射信号的发射耦合器连接在发射侧功率放大器和发射天线之间，和插入从盲区接收的信号的接收耦合器连接在接收侧低噪声放大器和分离器之间，以利用一个没有独立硬件的简化的电路构造覆盖盲区。因此，信号由光天线经过光电缆发射到位于远距离的盲区，并且该信号由色散天线经过同轴电缆发射到位于靠近范围的盲区，以向位于盲区中的移动站提供无线通信服务，而不必在该盲区中建立基站。
Description
本发明涉及一种CDMA移动通信系统，更详细地讲，涉及一种对位于盲区中的移动站提供呼叫服务而不必在该盲区中建立基站的移动通信系统的基站的射频控制电路。
如图1所示，一个现有的移动通信系统的基站的射频电路包括：一个用于接收具有相同频率的经过数字信号调制的载波信号FA1，FA2，...FAn，并组合它们的组合器1，一个连接于组合器1、用于放大组合的载波信号的功率放大器2，一个连接于功率放大器2、用于向一个通信区辐射放大的大功率载波信号的发射天线3，一个用于接收从一个用户的移动站发送的信号的接收天线4，一个连接于接收天线4、用于放大接收的无噪声信号的低噪声放大器5，和一个用于通过频率分配分割放大的信号的分离器6。功率放大器2可以是由一个线性功率放大器或一个大功率放大器构成的。
以下说明现有移动通信系统的基站的射频电路的操作。首先，以由功率放大器2放大一个通过组合器1与载波信号FA1，...，FAn组合的信号，并经过发射天线3向一个位于不是盲区中的移动站发送该信号这样的方式执行发送过程。通过以下的方式执行接收过程：通过接收天线4从位于不是盲区中的移动站接收一个射频信号，利用低噪声放大器5放大该射频信号，送至分离器6，并作为一个载波信号输入组合器1。
利用现有移动通信系统中的基站的射频控制电路，从发射天线或用户移动站天线辐射的载波信号在射频带中，因而它的波长是短的。这产生了其中不能发射和接收载波信号的盲区。盲区的例子包括地下，隧道，和摩天大楼内部等。载波频率越高，盲区的范围越大。
因此，现有的射频电路不能为位于盲区内的移动站提供呼叫服务。此外，为了向盲区中的用户提供呼叫服务，必须在每个盲区中建立具有射频电路的基站。
因此，本发明是要提出一种实际上消除了由于相关技术的局限和不足而造成的一个或多个问题的移动通信系统的基站的射频控制电路。
本发明的一个目的是要提供一种移动通信系统的基站的射频控制电路，它能够为位于盲区中的移动站提供呼叫服务，而不必在该盲区中建立基站。
在以下的说明书中提出了本发明的额外的特征和优点，并且可以从说明书中部分了解它们，或可以通过实践理解它们。通过写出的说明书和权利要求书以及附图中特别指出的结构可以实现和获得本发明的目的和其它优点。
为取得这些和其它优点，以及根据本发明的目的，一种移动通信系统的基站的射频控制电路包括：一个用于在发射过程中分出大功率载波信号的发射耦合器，该发射耦合器连接在一个发射侧放大器和一个发射天线之间；一个用于在接收过程中插入接收信号的的接收耦合器，该接收耦合器连接在一个接收侧分离器和一个低噪声放大器之间；一个用于在载波信号的发射/接收过程中执行电信号与光信号之间的相互转换的光天线接口，该光天线接口连接于发射和接收耦合器；包括多个光天线的光天线部分，用于在发射/接收过程中进行电信号和光信号之间的相互转换，所述光天线部分经过一个光缆连接到所述光天线接口上；一个对应地连接于光天线部分的色散天线部分，该色散天部分包括多个色散天线。
应当理解，上述的一般说明和以下的详细说明都是说明和解释性的，并且都是为了对权利要求中所界定的本发明提供进一步的说明。
用来提供对本发明进一步理解的所包括的，并且结合于此和作为说明一部分的附图显示了本发明的实施例，并且与说明书一同用来解释本发明的原理：
在附图中：
图1是在一个现有的移动通信系统中的一个基站的射频电路的方框图；和
图2是在一个根据本发明的移动通信系统中的一个基站的射频控制电路的方框图。
现在对本发明的优选实施例进行说明，该实施例显示在附图中。
图2是在一个根据本发明的移动通信系统中的一个基站的射频控制电路的方框图。参考图2，本发明的射频控制电路包括：一个用于接收具有相同频率的经过数字信号调制载波信号的并且组合它们的组合器11；一个用于放大由组合器11组合的载波信号的功率放大器12；一个用于向一个通信区辐射由功率放大器12放大的大功率载波信号的发射天线13；一个用于接收从一个用户移动站发射的信号的接收天线14；一个用于低噪声放大由接收天线14接收的信号的低噪声放大器15；一个用于通过频率分配分割低噪声放大的信号并且输出该信号的分离器16；一个连接在功率放大器12和发射天线13之间的、用于在发射过程中分出发射信号的发射耦合器21；一个连接在分离器16和低噪声放大器15之间、用于在接收过程中插入来自移动站的接收31信号的接收耦合器31；一个连接到发射和接收耦合器21和31的光天线接口41，用于在发射/接收过程中执行电信号和光信号之间的相互转换；一个通过光缆以辐射方式连接到光天线接口41的光天线部分51，包括多个在位于远距离的盲区中建立的光天线；和包括多级色散天线的色散天线部分61，色散天线部分61通过一同轴电缆对应地连接到光天线部分51并将信号放大如线路损耗一样多，并通过一低功率天线辐射放大的功率。
在发射过程中，多个光天线的每一个将从光天线接口41接收的光信号转换成射频电信号，并通过其低功率天线辐射该电信号。在接收过程期间，每个光天线将从其低功率天线或色散天线接收的射频信号转换成光信号，并将该光信号发射到光天线接口41。在发射过程中，通过同轴电缆连接到光天线的色散天线将从光天线接收的信号放大如由同轴电缆所导致的线路损耗一样多，通过其低功率天线辐射放大的信号，分出一部分信号，将所分出的信号放大到预定电平，并将其送到色散天线的下一级。在接收过程时，色散天线将通过其低功率天线或色散天线的下一级接收的射频信号增益控制到预定电平，并将其送到光天线。
组合器11接收被数字信号调制的、具有相同频率的载波信号FA1、...、FAn，对它们进行组合。由功率放大器12放大经组合器11组合的载波信号。使用发射天线13将由功率放大器12放大的高功率载波信号向通信区辐射。由接收天线14接收从用户的移动站发射的信号。由低噪声放大器15放大接收天线14接收的信号，并由分离器16分离该放大的信号。
在发射过程中，连接在功率放大器12和发射天线13之间的发射耦合器21分出待发射的信号，在接收过程中，连接在分离器16和低噪声放大器15之间的接收耦合器31插入由一个移动站接收的信号。在发射过程中，连接到发射耦合器21和接收耦合器31的光天线接41将从发射耦合器21接收的射频信号转换成光信号。接收过程期间，光天线接口41将光信号转换成射频电信号并将其送到接收耦合器31。
在位于远距离的盲区SC10、SC20、...、SCn0中建立通过光缆辐射地连接到光天线接口41的光天线部分51的光天线OAE10、OAE20、...、OAEn0。在发射过程中，光天线将从光天线接口41接收的光信号转换成射频电信号，通过其低功率天线将其辐射，分出一部分射频电信号并将所分出的信号送到色散天线DAE11、DAE21、...、DAEn1。光天线将从其低功率天线或色散天线接收的射频信号转换成光信号，并将其输出到光天线接口41。
色散天线部分61的色散天线通过同轴电缆连接到光天线部分51的光天线OAE10、OAE20、...、OAEn0，并建立在位于近距离范围的盲区SC11、SC21、...、SCn1中。在发射过程中，色散天线部分61将从多个光天线OAE10、OAE20、...OAEn0接收的信号放大如线路损耗一样多，通过其低功率天线将其辐射，分出一部分信号，将所分出的信号放大到预定电平，并将其送到色散天线DAE11、DAE21、...、DAEn1的下一级。在接收过程中，色散天线部分61的色散天线DAE11、DAE21、...、DAEn1将通过其低功率天线或色散天线DAE12、DAE22、...、DAEn2的下一级接收的射频信号增益控制到预定电平，并将增益控制的信号送到光天线OAE10、OAE20、...OAEn0。
色散天线DAE11、DAE21、...、DAEn1的前一级通过同轴电缆分别连接到色散天线DAE12、DAE22、...、DAEn2的下一级，并且色散天线被建立在盲区SC12、...，SC1-n；SC22、...、SC2n-1；...、；SCn2、...、SCnn-1中。在发射过程中，色散天线DAE12、DAE13、...、DAE1n-1；DAE22、DAE23、...、DAE2n-1；DAEn2、DAEn3、...、DAEnn-1将从色散天线的前一级发射的信号放大与线路损耗一样多，通过其低功率天线辐射放大的信号，分出一部分信号，将其放大到预定电平。它们还将从下一级色散天线接收的信号放大与线路损耗一样多并将其送到色散天线的前一级。
色散天线DAE1n-1、DAE2n-1、...、DAEnn-1通过同轴电缆连接到其前一级色散天线，并位于近距离范围的盲区SC1n-1、SC2n-1、...、SCnn-1中。在发射过程中，色散天线DAE1n-1、DAE2n-1、...、DAEnn-1将接收的信号放大如线路损耗一样多，通过其低功率天线辐射放大的信号，并在接收过程中将从其低功率天线接收的射频信号分别送到色散天线DAE1n、DAE2n、...、DAEnn。在此，发射是指从射频电路向位于盲区的一个移动站发射信号的过程，接收是指从位于盲区的移动站向射频电路发射信号的过程。前一级和下一级表示光天线和色散天线基于光天线接口的位置顺序。
下面说明根据本发明移动通信系统的基站的射频控制电路的操作。在此，由于位于除盲区外的区域中的一个移动站与基站之间的通信处理与常规系统中的相同，因此仅说明位于盲区中的移动站与基站之间的通信处理。
在发射过程中，由功率放大器12放大的信号送到发射天线13，并由发射耦合器21分出一部分信号。光天线接口41将从发射耦合器21接收的射频信号转换成光信号，并将其送到多个光天线OAE10、OAE20、...、OAEn0的每一个。多个光天线OAE10、OAE20、...、OAEn0将接收的光信号转换成射频电信号，并将其送到通过其低功率天线辐射射频信号的色散天线DAE11、DAE21、...、DAEn1的每一个，放大一部分信号，并将放大的信号送到色散天线的下一级。色散天线DAE1n、DAE2n、…、DAEnn的末级接收来自前一级色散天线的信号，并通过其低功率天线将其辐射。
在接收过程中，从每个色散天线接收的射频信号依次通过前一级色散天线最终到达将所接收的射频信号送到光天线OAE10、OAE20、...、OAEn0的色散天线DAE11、DAE21、...、DAEn1。光天线OAE10、OAE20、...、OAEn0将从色散天线DAE11、DAE21、...、DAEn1或其低功率天线送来的射频信号转换成光信号并将其送到光天线接口41。光天线接口41将接收的光信号转换成射频电信号并将其送到向接收信号插入射频电信号的接收耦合器31，然后将其送到分离器16。
如上所述，本发明移动通信系统的基站的射频控制电路是这样构成的：即分出到盲区的发射信号的发射耦合器连接在发射一侧的功率放大器和发射天线之间，插入从盲区接收的信号的接收耦合器连接在接收一侧的低噪声放大器和分离器之间，以使用简化的电路结构而不使用分离硬件覆盖盲区。因此，根据本发明，由光天线通过光缆将信号发射到位于远距离的盲区，并由色散天线通过同轴电缆将信号发射到位于近距离范围的盲区，以便不在盲区中建立基站向位于盲区中的移动站提供无线通信服务。
很明显，本领域技术人员在不脱离本发明精神和范围的情况下可对本发明移动通信系统的基站的射频控制电路进行各种改进和变化。因此，本发明意在覆盖所附权利要求和其等同物的范围内提供的改进和变化。
Claims (5)
1.一种移动通信系统的基站的射频控制电路，包括：
一个用于在发射过程中分出大功率载波信号的发射耦合器，该发射耦合器连接在一个发射侧放大器和一个发射天线之间；
一个用于在接收过程中插入接收信号的的接收耦合器，该接收耦合器连接在一个接收侧分离器和一个低噪声放大器之间；
一个用于在载波信号的发射/接收过程中执行电信号与光信号之间的相互转换的光天线接口，该光天线接口连接于发射和接收耦合器；
包括多个光天线的光天线部分，用于在发射/接收过程中进行电信号和光信号之间的相互转换，所述光天线部分经过一个光缆连接到所述光天线接口上；
一个对应地连接于光天线部分的色散天线部分，该色散天部分包括多个色散天线。
2.如权利要求1所述的电路，其中光天线接口和光天线部分通过一个光缆相互连接。
3.如权利要求1所述的电路，其中光天线部分位于较光天线接口较近的盲区中，而色散天线位于较远的盲区中。
4.如权利要求1所述的电路，其中光天线部分和色散天线部分通过一个同轴电路相互连接。
5.如权利要求1所述的电路，其中色散天线部分将射频信号的功率放大到由一同轴电缆导致的线路损失一样多，并且通过一个小功率天线辐射之。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH022727A (ja) * | 1988-06-17 | 1990-01-08 | Shiyoudenriyoku Kosoku Tsushin Kenkyusho:Kk | 光ファイバを介した電波送受信方式 |
| US4972505A (en) * | 1988-12-06 | 1990-11-20 | Isberg Reuben A | Tunnel distributed cable antenna system with signal top coupling approximately same radiated energy |
| JPH0530044A (ja) * | 1991-07-25 | 1993-02-05 | Kokusai Denshin Denwa Co Ltd <Kdd> | 光通信方式 |
| US5457557A (en) * | 1994-01-21 | 1995-10-10 | Ortel Corporation | Low cost optical fiber RF signal distribution system |
| EP0674452B1 (en) * | 1994-03-24 | 2002-07-03 | Hitachi Kokusai Electric Inc. | Repeater for radio paging system |
| EP0762674A3 (de) * | 1995-09-08 | 2001-03-21 | Siemens Aktiengesellschaft | Verfahren und Schaltungsanordnung zum Übertragen von Empfangssignalen von einer Antenne zu einer Basisstation eines Funksystems |
-
1996
- 1996-11-21 KR KR1019960056064A patent/KR100221287B1/ko not_active IP Right Cessation
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1997
- 1997-11-20 US US08/974,455 patent/US6069721A/en not_active Expired - Lifetime
- 1997-11-21 CN CN97122159A patent/CN1087896C/zh not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| KR100221287B1 (ko) | 1999-09-15 |
| CN1185085A (zh) | 1998-06-17 |
| US6069721A (en) | 2000-05-30 |
| KR19980037326A (ko) | 1998-08-05 |
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