针对基于光纤无线电(RoF)的分布式天线系统的结构特点，提出了一种利用光纤承载数字中频信号实现天线拉远的方案，并从节约资源与提高性能两方面，给出了在FPGA中实现数字下变频模块的设计方案，分析和仿真结果表明: 该设计减少了资源消耗,性能达到了未来宽带无线通信系统的性能要求。

In view of the structural features of the distributed antenna system, a RoF-based solution for digital intermediate frequency remote is proposed. The design of the digital down converter module is given via FPGA in consideration of resource saving and performance improvement. The analytical and simulation results show that this design contributes to the reduction of resource consumption and satisfaction of the module performance with the requirements of the future broadband wireless communication system.