基于FPGA的数字上下变频器的研究与实现，适合通信专业人员参考-FPGA-based digital down converter Research and Implementation for communications professionals reference

软件无线电中数字上下变频器研究与实现，适合通信专业人员参考-Digital Software Radio Research and Implementation of up and down converter for communication professionals reference

数字下变频器的matlab仿真，包括基带信号的调制，然后经过混频模块、CIC模块、FIR模块最后得到基带信号的过程-Digital down converter matlab simulation, including the modulation baseband signal, and then after mixing module, CIC module, FIR module finally get baseband signal process