摘要
本文针对QPSK调制信号的特点,提出了基于状态机的全数字解调算法,并根据QPSK信号的传输特点获取载波频率,实现了对中频QPSK信号的解调。设计针对信号的频率偏移增加了容差处理,对相位的偏差有较大的容忍裕度,降低了解调误码率。整个设计基于Quartus Ⅱ平台,用VHDL语言编程实现。经过软件仿真和硬件测试,验证了该设计的正确性和可行性。
Algorithm for full digital demodulation based on state machine is presented, according to the characteristics of QPSK-modulated signals. The QPSK demodulation of intermediate frequency signal is realized based on the transmission features of QPSK signals to obtain carrier frequency. Tolerance processing is added to include larger phase offset and decrease the bit error rate of demodulation. The design based on Quartus Ⅱ platform is realized by using VHDL Language. The validity and feasibility are verified through software simulation and hardware test.
出处
《电路与系统学报》
CSCD
北大核心
2010年第5期18-21,共4页
Journal of Circuits and Systems
基金
国家自然科学基金-中物院联合基金资助项目(10876029)
关键词
正交相移键控
状态机
容差
VHDL
quadrature phase shift keying
state machine
tolerance
VHDL
