Cellular communications system with centralized base stations and
distributed antenna units
    10.
    发明授权
    Cellular communications system with centralized base stations and distributed antenna units 失效
    具有集中基站和分布式天线单元的蜂窝通信系统

    公开(公告)号:US5627879A

    公开(公告)日:1997-05-06

    申请号:US204660

    申请日:1994-03-02

    摘要: A microcellular communications network includes a plurality of base station units and corresponding antenna units. The base station units are housed in a common location. Each includes either conventional transmitters and receivers or all digital transmitter and receiver equipment, and interface circuitry to a mobile telecommunications switching office. The microcell traffic output is applied to a frame generator/multiplexer. The output of the frame generator/multiplexer is applied to a digitally modulated laser. The laser output is conveyed by fiber to a remote antenna unit, which demultiplexes the microcell traffic signal and applies it to a digital-to-analog converter. The output of the digital-to-analog converter is applied to a power amplifier, which in turn is connected to a main antenna. RF signals from the mobile units are received at both a main and a diversity antenna. The received signals are filtered, digitized, multiplexed together and transmitted over the optical fiber back to the base station. The strongest signal is selected for use.

    摘要翻译: 微蜂窝通信网络包括多个基站单元和对应的天线单元。 基站单元位于公共位置。 每个都包括传统的发射机和接收机或所有数字发射机和接收机设备,以及到移动电信交换局的接口电路。 微小区流量输出被应用于帧发生器/多路复用器。 帧生成器/多路复用器的输出被应用于数字调制激光器。 激光输出由光纤传送到远程天线单元,其将多路复用微小区业务信号并将其应用于数模转换器。 数模转换器的输出被应用于功率放大器,功率放大器又连接到主天线。 来自移动单元的RF信号在主天线和分集天线两者都被接收。 接收的信号被滤波,数字化,多路复用在一起,并通过光纤传送回基站。 选择最强的信号使用。