全数字高速OQPSK信号解调技术分析

摘要

根据某侦察接收机的需要，基于软件无线电设计思想，分析了影响解调性能的主要因素以及解决方法，提出了一种偏移正交相移键控（OQPSK）解调器的全数字实现结构。介绍了数字下变频滤波抽取、符号同步和载波同步等模块的详细设计与实现。解调器结构简单，具有高度的稳定性、灵活性和可扩展空间，可以应用于通信、侦察接收机中。%In this paper, the main factors that affect the demodulator performance are analyzed. A design of all digital OQPSK demodulator based on software defined radio is presented. The demodulator includes digital down converter, carrier recovery and timing recovery, etc. The demodulator achieves high performance by using a joint architecture of timing and carrier synchronization. The system has good extensibility and flexibility and it can be applied to demodulation for communication or receiver