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本文着重研究全数字QAM接收机中载波恢复环路的设计,采用快慢两个数字环路来进行载波恢复。慢环路由锁频器(Frequency Detector)、锁频锁相器(Phase and Frequency Detector)等组成,快环路由相位解旋器和锁相器(Phase Detector)组成。仿真结果表明,在AWGN条件下,两个环路的环路参数设置存在一个最佳点,当两个环路工作在这个最佳点附近时接收机能够很好的进行载波频率、相位的恢复,相位噪声对接收机性能的影响最小。最后,给出了在不同信噪比下的最佳环路参数表。
This paper focuses on the design of all-digital QAM receiver carrier recovery loop, using two fast and slow digital loop carrier recovery. The slow loop consists of Frequency Detector, Phase and Frequency Detector, etc. The fast loop consists of a phase resolver and a phase detector. The simulation results show that under AWGN conditions, the loop parameters of the two loops have an optimal point. When the two loops work at the optimal point, the receiver can perform good carrier frequency and phase recovery , Phase noise has the least impact on receiver performance. Finally, the best loop parameters table is given under different SNRs.