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针对线性调制信号,提出一种新的每符号两个样点的非数据辅助的前向符号定时估计算法。算法的基本思想是:首先,将两倍符号速率的样点信号通过一个特定的抗混叠滤波器,使得输出信号经非线性变换后,在符号速率处不再混叠;然后,利用传统的平方律非线性等算法估计定时相位偏差。文中详细描述了算法的推导过程。最后的仿真数据表明,在计算复杂度相当的情况下,新算法的估计性能优于其他两种算法,并且对于信号及应用环境的适应性更强。
Aiming at the linear modulation signal, a new non-data-aided forward symbol timing estimation algorithm with two samples per symbol is proposed. The basic idea of the algorithm is as follows: Firstly, a sample signal with double symbol rate is passed through a specific anti-aliasing filter so that the output signal is non-aliased at the symbol rate after nonlinear transformation. Then, Square Law Nonlinearity and Other Algorithms Estimate Timing Phase Deviation. The article describes in detail the algorithm’s derivation process. The final simulation data shows that the proposed algorithm outperforms the other two algorithms under the same computational complexity and is more adaptable to signal and application environment.