一种基于前馈定时的OQPSK解调方法  

A Method for OQPSK Demodulation Based on Feed Forward Timing

作　　者：张丽娜[1] 陈敬乔[1] ZHANG Li’na;CHEN Jingqiao(The 54th Research Institute of CETC, Shijiazhuang 050081, China)

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电工程》2018年第6期468-471,共4页Radio Engineering

基　　金：国家高技术研究发展计划("863"计划)基金资助项目(2015AA015701)

摘　　要：针对传统的偏移正交相移键控(OQPSK)解调方法中载波和定时同步进行、二者相互制约、调试难的问题,提出一种基于前馈定时的解调方法。采用频域非线性定时估计算法提取定时误差进行基于内插的定时恢复,利用FFT对数据进行载波频差估计,利用2倍数据的Costas环进行载波相位的恢复。该方法实现简单,避免调试中环套环时参数调试的困难。实验结果表明,解调信噪比恶化小于0.5 d B,可以用于指导工程实践。In traditional Offset Quadrature Phase Shift Keying（OQPSK） demodulation,the timing and carrier synchronization areperforming at the same time and restricting each other,making it difficult to perform debugging. This paper proposed a demodulation method based on feed forward timing. Firstly,FFT is used to estimate carrier frequency error. Then Costas loop with double data rate is used to recover carrier phase. At last interpolation timing recovery with timing error is obtained by using the frequency domain nonlinear timing estimate algorithm. The advantage of this scheme is easy realization and avoids difficult debugging,with the lost of demodulation SNR less than 0.5 dB. It provides a guide in engineering.

关 键 词：偏移正交相移键控 定时恢复 载波频差估计 载波相位恢复 

分 类 号：TN911.3[电子电信—通信与信息系统]