通信系统中数字上变频技术的研究与设计

摘要

为了将通信系统中数字基带信号调制到中频信号上，采用数字上变频技术，通过对数字I,Q两路基带信号进行FIR成形滤波、半带插值滤波、数字混频处理得到正交调制后的中频信号．最后经MATLAB仿真分析得到相应的时域和频域图，来验证电路设计的有效性。%Baseband signal is modulated intermediate frequency signal by the technogy of digital up conversion in communication system.The I and Q digital baseband signals that are filtered by shaped FIR and half band interpolation, processed by digital mixer,turn into modulated intermediate frequency signal.At last,the circuit design is validated by the time and spectrum figures of MATLAB simulation and analysis.