研究结果:通过分析得出，每个基站所带光纤直放站不宜超出4个，否则将引起基站灵敏度的严重下降 基站和光纤直放站采用空间波覆盖时，光纤直放站宜采用单定向天线向远离基站的方向覆盖。在采用LCX 的区段，由于时延限制，提高光纤直放站输出电平不能增加覆盖范围。另外，基站和光纤直放站之间的LCX 最好不作断开。

Research results: It has been pointed out through analysis that not more than four optic-fiber repeaters shall be set in each BTS. If more than four ， this will reduce the sensitivity of BTS. The BTS and optic-fiber repeater shall be covered by spatial waves while the optic-fiber repeater shall be better to be covered by the single-directional antenna far from the BTS. In the LCX section，the coverage range cannot be increased due to the time-limited delay by increasing the output-electrical level of optic-fiber repeaters. It is better not to cut off the LCX between the BTS and the optic-fiber repeater.