【摘要】 针对星间链路通信中常用的BPSK、QPSK、UQPSK和64QAM等调制信号的载波频偏估计问题,提出了一种基于Burg谱估计和FFT的通用频偏估计方法。采用Burg谱估计方法对信号进行粗频偏估计,补偿该频偏后得到含有较小残留频偏的信号;并进行改进的四次方非线性变换,去除调制信息;再利用FFT估计出较高精度的残留频偏值。仿真结果表明,该方法估计精度高、范围大。更多还原

【Abstract】 A general frequency offset estimation method of BPSK,QPSK,UQPSK and 64 QAM signals based on Burg spectrum estimation and FFT is proposed to solve the carrier frequency offset estimation of common signals in inter satellite link communication. First,the coarse frequency offset estimation is obtained by using the Burg spectrum estimation method,and the signal of the residual frequency offset is obtained after the compensation of the frequency offset. Then the improved fourth non-linear transformation is used to remove modulated information. Finally,the residual frequency offset value is estimated by FFT. Simulation results show that this method is of high accuracy and wide acquisition range.更多还原