《移动通信直放站的应用与调测》.docVIP

移动通信直放站的应用与调测 　　【摘 要】直放站(中继器)属于同频放大设备,是指在无线通信传输过程中起到信号增强的一种无线电发射中转设备。直放站的基本功能就是一个射频信号功率增强器。直放站在下行链路中,由施主天线现有的覆盖区域中拾取信号,通过带通滤波器对带通外的信号进行极好的隔离,将滤波的信号经功放放大后再次发射到待覆盖区域。在上行链接路径中,覆盖区域内的移动台手机的信号以同样的工作方式由上行放大链路处理后发射到相应基站,从而达到基地站与手机的信号传递。使用直放站作为实现“小容量、大覆盖”目标的必要手段之一,主要是由于使用直放站一是在不增加基站数量的前提下保证网络覆盖,二是其造价远远低于有同样效果的微蜂窝系统。直放站是解决通信网络延伸覆盖能力的一种优选方案。它与基站相比有结构简单、投资较少和安装方便等优点,可广泛用于难于覆盖的盲区和弱区,如商场、宾馆、机场、码头、车站、体育馆、娱乐厅、地铁、隧道、高速公路、海岛等各种场所,提高通信质量,解决掉话等问题。 　　【关键词】直放站;移频直放站;同频直放站;直放站维护;放大器;天线;基站;上行;下行 　　Let stand until the application and maintenance 　　GaoRui 　　(Shanxi Tianyuan communication design consulting Co., LTD Xian Shanxi 710075) 　　【Abstract】:Let stand until (Repeaters) belong to same frequency amplifier equipment, refers to the wireless transmission process signal enhancement of a radio transmitting transfer equipment. The basic function of the workstation rf signal is a power increase. Let stand straight in downlink antenna, the benefactor of link existing coverage of signal, pick through bandpass filter to take TongWai signal of the extremely good isolation, filtering signal amplifier amplification again after the launch to stay coverage. The uplink link path, covering area of mobile handset signals in the same way of working by uplink amplification link to the corresponding processing base after launch, thus achieved the base station and mobile phone signal transmission.Use straight as little put large capacity, covering the necessary means one, is mainly due to the use of workstation in the number of base without increasing the premise to guarantee that the network covers, 2 it is far below the cost of have the same effect microcells system. Let stand until is to solve the communication network covering capacity of a kind of outspread optimal scheme. It has simple structure, base with less investment and convenient installation etc, and can be widely used for the blind to cover and weak area, such as the market, hotel, airport, dock, station, gym, recreation, subway, tunnel,