DS／BPSK信号载频估计的互相关积累法

针对强高斯白噪声背景下的DS/BPSK信号载频估计问题,在研究平方倍频法的基础上,借鉴相关积累思想,提出了一种互相关积累法。该方法利用余弦信号相关而噪声不相关的特性,在平方倍频处理后端加入了互相关积累手段与集平均技术,改善了处理的输出信噪比。计算机仿真表明,两次接收分段互相关积累法在成功地实现了比传统估计方法更低的信噪比容限的同时还有效地节省了系统设备量。

Cross-correlation accumulation for DS/BPSK signal carrier estimation

For the carrier frequency estimation of DS/BPSK signals damaged by strong additive white Gaussian noise,a cross-correlation accumulation method is proposed with the aid of the nonlinear processing and the thought of correlation accumulation.For the proposed method,the correlation of cosine signals and the mutual independence of noises are fully utilized,and cross-correlation accumulation at the end of the nonlinear processing is added.Hence the output SNR is improved.The simulation result shows that the proposed method can not only lead to lower SNR limitation than that of the traditional methods,but also reduce the number of system equipment.