SDR中一种新型调制平台的设计与实现

Design and implementation of new modulation platform in SDR

提出了一种微控制器+U盘的FPGA脱机重构方案;采用此方案设计了SDR中一种新型通用的硬件调制平台;配合调制IP核实现了对不同类型基带信号的多种调制以及海量配置数据的脱机重构。微控制器通过扫描键盘来调用U盘内相应的配置数据对FPGA进行在线重构;FPGA根据重构数据对基带信号进行处理并发送到数字正交上变频(DUC)芯片中,实现调制信号的输出,同时把调制信息反馈给微控制器;微控制器把当前调制状态信息发送到LCD进行显示。与传统的调制方法相比:该平台功能强大、操作灵活、调制种类多、软件易升级、支持动态脱机重构,具有较高的工程应用价值。

This paper presents an off-line reconfigurable method for FPGA based on micro control unit （MCU） and U disk. By using this method, a new hardware modulation platform in SDR is designed. With the help of modulation IP core, the method can achieve multiple modulations for different kinds of baseband signal and off-line reconfiguration for a large number of configuration data. By scanning the keys, the MCU calls the corresponding configuration data in the U disk to achieve on-line reconfiguration of the FPGA. Based on the refactoring data, FPGA deal and send the baseband signal to the DUC to achieve the out-put of the modulation signal. Modulation result was sent to MCU and displayed on the LCD. Compared with the traditional methods, this method has the advantages of flexible operation, easy upgrade, multiply modulation, and supporting off-line dynamic reconfiguration, thus having a higher value in engineering.