载波恢复相位检测技术及其仿真

Carrier Recovery Phase Detection and Its Simulation

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 is the key technology for coherent demodulation receiver in RF communication, and carrier recovery algorithm directly determiner the performance of the receiver. This paper, in combination with high-speed satellite communication application, first studies the structural model of the carrier recovery loop based on maximum posteriori probability estimation principle, and then analyzes in-depth the features of the adopted carrier phase error detection algorithm, and finally describes the simulation on loop phase-discrimination features and gives the results of loop performance fest. The results indicate that this kind of carrier recovery loop, including its error detection algorithm, is especially suitable for QPSK system in high-speech satellite communication application environment with low SNR.