基于小波变换的码元速率估计优化算法
Acta Automatica Sinica(2020)
Abstract
针对低信噪比下MPSK (M-ary phase shift keying)信号的码元速率估计问题,提出一种优化算法.该算法无需先验知识,通过Hilbert变换提取瞬时相位基带序列,经多尺度小波变换,对每个尺度下的小波系数的模值的平方进行叠加,对叠加后的结果再进行功率谱计算,在码元速率整数倍处有离散谱线,估计正确率在信噪比大于1 dB时大于90%.
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