应用于卫星通信的OQPSK的载波相位估计和解调方法  

Carrier Phase Estimation and Demodulation Method in OQPSK for Satellite Communication

作　　者：王晓洪 谢永锋 吴仡 

机构地区：[1]成都天奥信息科技有限公司,四川成都610036

出　　处：《通信技术》2016年第2期143-146,共4页Communications Technology

摘　　要：提出一种应用于海事卫星电话的载波相位估计和OQPSK的数字解调方法。载波相位估计的理论推导来自信道估计理论。解调方法是相位估计与最佳采样判决进行联合估计。此方法特别适合于卫星突发信号传输,能快速估计出相位。在低信噪比下的解调性能满足卫星实时通信。通过仿真分析了其性能,对存在有载波频率误差在200 Hz以内的接收信号都有较好的性能。最后在工程应用中再次验证了其性能满足卫星实时通信。A carrier phase estimation and OQPSK digital demodulation for marine satellite telephone is proposed. Theoretical derivation of carrier phase estimation is based on channel estimation theory. The demodulation method is a joint estimation of phase estimation and optimal sampling decision. This method, for its quick estimation of the phase, is particularly applicable to satellite signal transmission, and demodu- lation performance could meet the real time requirement of satellite communication in the low signal-tonoise ratio. The performance is analyzed by simulation. Simulation results show that, this method has good performance of carrier frequency error of 200Hz and low signal-to-noise ratio. Finally, this performance is verified in the engineering application.

关 键 词：相位估计 OQPSK 数字解调 信道估计 

分 类 号：TN927[电子电信—通信与信息系统]