LFM-BPSK复合调制参数快速估计及码元恢复

Fast parameter estimation of LFM-BPSK composite modulation and symbol recovery

针对常见的LFM-BPSK参数估计算法计算量大且需要先验知识的缺点,提出了一种基于乘加运算参数快速估计硬件可实现算法。利用平方运算去除BPSK的影响,对LFM的参数进行估计并根据参数恢复出LFM信号,原信号与恢复出的LFM的共轭相乘,从而恢复出BPSK的基带信号,在基带上对BPSK进行参数快速估计及码元恢复。为了解决码元恢复过程中的累积误差及噪声毛刺而造成的码元恢复错误,提出了一种码元累积误差定时清零及毛刺去除的硬件可实现算法。

In view of large calculation amount and requirement of priori knowledge for the common LFM-BPSK parameter estimation algorithms,a realizable hardware algorithm is proposed for fast parameter estimation based on multiplication and addition.Firstly,the square operation is used to remove the influence of the binary phase shift keying(BPSK),and then the linear frequency modulation(LFM)parameters are estimated and the LFM signal is recovered according to the parameters.The conjugate multiplication of the original signal and the recovered LFM is used to recover the baseband signal of the BPSK,and the BPSK parameters are estimated and the symbols are recovered quickly on the baseband.In order to solve the error of symbol recovery caused by accumulated error and noise burr in the process of symbol recovery,the realizable hardware algorithm is proposed for timing clearing and burr removal of accumulated symbol error.