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载波恢复技术是无线电射频(RF)通信中相干解调接收机不可缺少的关键技术之一。载波恢复算法的优劣直接决定着接收机的性能。结合高速卫星通信的应用,文中首先对基于最大后验概率估计准则载波恢复环的结构模型进行了研究,然后对所采用的载波相位误差检测算法的特性进行了深入的分析,最后对载波恢复系统中尤其重要的环路鉴相特性进行了计算机仿真,给出了环路性能试验分析结果。结果表明,在低信噪比的情况下,这种载波恢复环路及其误差检测算法特别适合于高速卫星通信应用环境下的QPSK系统。
Carrier recovery technology is one of the key technologies indispensable for coherent demodulation receivers in radio frequency (RF) communications. The merits of the carrier recovery algorithm directly determine the performance of the receiver. Combined with the application of high-speed satellite communications, this paper first studies the structure model of carrier recovery loop based on the maximum a posteriori probability estimation criterion, and then analyzes the characteristics of the adopted carrier phase error detection algorithm in-depth. Finally, the carrier recovery system Especially in the loop phase characterization of a computer simulation, loop performance analysis results are given. The results show that this carrier recovery loop and its error detection algorithm are particularly suitable for QPSK systems in high-speed satellite communication applications under low signal-to-noise ratio.