一种数字调制信号符号速率盲估计方法

A Blind Estimation Algorithm for Symbol Rate of Digitally Modulated Signals

数字调制信号符号速率估计的循环平稳类算法需要较少的先验信息,是非合作接收系统中一种实用的估计算法。将循环自相关和非线性滤波结合,提出了一种符号速率盲估计算法。通过累加不同时延的循环自相关和非线性滤波突出并增强符号率谱线并白化噪底,之后与门限进行简单比较即可选出正确的符号率谱线。计算机仿真和实际采集数据验证了该算法的性能。

Cyclostationary approaches for symbol rate estimation of digitally modulated signals needs less prior information,so it is a practical estimation algorithm in non-cooperative systems.A symbol rate blind estimation algorithm is proposed by combining cyclic autocorrelation and nonlinear filtering.The correct symbol rate spectral line is selected by accumulating the cyclic autocorrelation and nonlinear filtering with different time delays to highlight and enhance the symbol rate spectral line and whiten the noise floor.Then the correct symbol rate spectral lines can be detected by simple comparison with the threshold.The computer simulations and actual measured data results verify the effectiveness of the proposed algorithm.