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.
出处
《通信技术》
2016年第2期143-146,共4页
Communications Technology
关键词
相位估计
OQPSK
数字解调
信道估计
carrier phase estimation
OQPSK
digital demodulation method
channel estimation
