基于多路合成的π/4 QPSK的设计与实现  

Design and Realization of Multi-channels π/4 QPSK

作　　者：刘志鹏[1] 孙延坤[1] 刘轶铭 王兆伟[1] 

机构地区：[1]中国电子科学研究院,北京100041

出　　处：《中国电子科学研究院学报》2016年第6期642-648,共7页Journal of China Academy of Electronics and Information Technology

基　　金：国家自然科学基金青年科学基金项目(61501415)

摘　　要：研究了π/4 QPSK的调制解调.为了达到DAC的采样率,采用了多路合成得到π/4 QPSK.给出了基于查表的平方根升余弦成形滤波器的设计方法;对比了直接采用平方根升余弦成形滤波器得到的π/4 QPSK的频谱和基于查表的平方根升余弦成形滤波器得到的π/4 QPSK的频谱,分析得到直接采用平方根升余弦成形滤波器得到的π/4 QPSK的频谱会产生不需要的频谱分量.在多路合成时,需要采用基于查表的平方根升余弦成形滤波器的设计方法.分析了中频差分解调方法,得到理论误码率曲线和仿真结果基本一致。The modulation and demodulation of π/4 QPSK is studied. To achieve sampling rate of DAC, π/4 QPSK is realized by multi-channels. The design method of a square-root raised cosine filter based on query table is given. The spectrum of π/4 QPSK is realized by the square-root raised cosine filter, which is in comparison with the spectrum based on query table. The conclusion is that the needless spectrum is generated when the π/4 QPSK is realized by the square-root raised cosine filter based on filter. Multi- channels π/4 QPSK could be realized by the square-root raised cosine filter within query table. IF band differential detection method is analyzed, and the bit error rate is simulated. Simulation result is same as the theoretic result.

关 键 词：π/4 QPSK 升余弦滤波器 多路合成 

分 类 号：TN911.3[电子电信—通信与信息系统]