QPSK信号旋转方向对调制解调的影响  

The Effect of Rotation Direction for the QPSK Signal on Modulation and Demodulation

作　　者：曹颖鹏 杨光文 靳一 CAO Yingpeng;YANG Guangwen;JIN Yi(China Academy of Space Technology(Xi'an),Xi'an 710000,China)

机构地区：[1]中国空间无线电技术研究所,西安710000

出　　处：《空间电子技术》2020年第3期13-17,共5页Space Electronic Technology

基　　金：国家自然科学基金资助项目(编号:61801377)。

摘　　要：文章针对QPSK信号调制解调旋转方向不一致而导致的通信异常问题,通过深入分析及理论推导,得出当QPSK信号调制解调双方旋转方向不一致时,解调器译码输出的I Q支路数据与调制前的I Q支路数据彼此互换。基于此结论,对现有FPGA软件解相位模糊及译码算法进行了扩展及优化,使得解调器可兼容顺时针和逆时针两种旋转方向的QPSK调制信号的解调译码,从而提高了解调器的自适应性,仿真结果证实了该方法的有效性。A simple and useful algorithm is proposed to solve the problem of abnormal communication caused by the inconsistent rotation direction of modulation and demodulation for QPSK signal.From the theoretical derivation and analysis,it is shown that the I/Q data decoded by the demodulator are exchanged with the I/Q data before the modulation when the rotation direction of modulation and demodulation for QPSK signal are inconsistent.The algorithm of existing FPGA Software which is to solve the phase ambiguity and decoding are extended and optimized.And the demodulator can demodulate and decode the QPSK signals in clockwise and counterclockwise rotation directions.And the method was proved by the simulation.

关 键 词：调制解调 旋转方向 解相位模糊 译码 

分 类 号：V474[航空宇航科学与技术—飞行器设计]