对光载毫米波(ROF)系统中毫米波副载波的上变频方案进行了理论分析及仿真研究。在中心站端通过30 GHz的本地振荡源,采用载波抑制技术得到了差频为60 GHz的光载射频信号,即在中心站实现了上变频的处理。该系统不需要在基站设置高频震荡源,大大降低了ROF系统的成本,满足了未来光无线通信系统中不断增长的载波频率的要求。同时,理论分析了中心站上变频的信号产生方法,搭建了仿真系统,结合理论分析结果,验证了该方案产生的ROF信号在光线中的传输性能及传输距离。

The up conversion method of radio-over-fiber (ROF) system is theoretically investigated and simulated,which is the key technique of ROF system. Based on optical carrier suppression,the 60 GHz optical-wireless signal is generated by the 30 GHz local oscillator in central station (CS). The up conversion procedure also take effect in CS,thus the local oscillator is not needed in the base station (BS). The cost is cut down by this method. Thus the growing need of the high frequency telecommunication can be met. Also,the simulation system is set up to testify the transmission performance of the ROF signal.