联合相位和定时估计的二进制CPM信号解调器

Binary CPM Signal Demodulator with Joint Phase and Timing Estimation

针对二进制CPM信号,提出一种载波相位和定时联合估计的解调算法,算法主要基于Laurent分解,利用载波相位和定时的最大似然估计和判决反馈,将V iterb i译码器、载波相位和定时估计结合在一起,同时实现了载波相位和定时的联合估计以及CPM信号的解调。仿真实验表明,较低信噪比条件下该解调器对存在较小残留频偏、任意初相和定时误差以及定时点漂移的情况都能够实现正确解调,具有优良的性能。

For binary CPM signals,a demodulation scheme with joint carrier phase and timing estimation is proposed.Based on Laurent decomposition,ML criterion and feedback-decision,the proposed demodulator combines Viterbi decoder with PLL and timing loop,which can simultaneously perform carrier phase and timing estimation as well as CPM signal demodulation.Simulation experiments indicate that the proposed demodulator can work well and possess a good performance on the condition of low SNR,small residual frequency offset,random initial phase and timing error.